Hyalmass CaHA+ Injection Depth | Dermis, Subcutaneous, Best Practices

Hyalmass CaHA+ injection optimal depth is middle dermis to superficial dermis or subcutaneous fat layer, according to different parts, tilt angle should be 30°–45°, injection amount per point 0.1–0.2 mL, maintain uniform distribution, avoid blood vessels and nerves, after surgery gentle massage helps material uniform diffusion, to enhance skin support and improve fine lines effect.

Dermis

Specifications & Structure

Hyalmass CaHA+ storage environment needs to maintain at 2-25 degrees Celsius. Its internal 30% concentration Calcium Hydroxylapatite microspheres diameter accurately controlled at 25-45 microns. Dermal layer reticular zone physical thickness usually distributed between 1.5mm to 3mm. Here contains 80% Type I collagen fibers and 15% Type III collagen fibers. Operation usually selected at 1.8mm depth below the surface. This layer distributes a large number of fibroblasts, being an active area for biostimulation occurrence. The 1.63 high refractive index of the microsphere surface lets the material present specific optical characteristics under the skin. 30% solid microspheres are suspended in 70% carboxymethyl cellulose carrier. This carrier gel dynamic viscosity at room temperature maintains at 350,000 cP. Injection pressure needs to be set at 15-20 psi, ensuring the gel permeates uniformly at 0.1ml/min flow rate. After the gel enters the connective tissue gaps of the deep dermis, it will occupy the original physical space.

• CaHA microsphere specific gravity: 1.5g/cm3
• Carrier gel pH value: 6.8 – 7.5
• Particle sphericity: Greater than 98%
• Single fan tiling amount: 0.05ml – 0.15ml
• Tissue osmotic pressure: 290 mOsm/L
• Mixed saline ratio: 1:1 to 1:4

The deep dermis microenvironment, after contacting the material, will produce intercellular fluid exchange within 24 hours. The carrier gel has strong hydrophilicity, can instantly lock water molecules 50 times its own volume. Entering the 14-day observation period, the carrier starts to metabolize via non-enzymatic hydrolysis. At this time, a layer of endogenous protein film forms on the 25-45 micron microsphere surface. This layer of film will attract fibroblasts to colonize on the microsphere scaffold. When operating on the zygomatic area, the bevel needs to face down, piercing at a 30-degree angle. Maintain constant pressure during the withdrawal process, making the material form a linear strand 2cm long and 0.2cm wide. Each 1ml of original drug usually mixes with 1.5ml of 0.9% sodium chloride solution. The diluted mixture’s viscosity decreases, making it easier to spread within the 2mm thickness layer. Adopting cross-grid technology can cover wider damaged areas.

• 27G sharp injection depth: 2.0mm
• 25G blunt injection depth: 2.2mm
• Withdrawal drug delivery rate: 0.02ml/sec
• Skin thickness increase rate: 15% – 25%
• Collagen fiber arrangement density improvement: 30%
• Maintenance cycle: 12 – 18 months

From a microscopic level, CaHA microspheres do not possess fluidity, their chemical properties are extremely stable. Within the 12-18 month degradation cycle, microspheres continuously play a scaffold role. 4 weeks after injection, Type III collagen in the dermis transforms into Type I collagen. Test data shows, the tension per square centimeter of stressed area can increase by about 12 dynes. The injection point must avoid the 0.5mm superficial dermis area. This can prevent microsphere accumulation from producing visible white reflections. In areas with thin subcutaneous fat such as the mandibular margin, operation depth needs to be reduced to 1.2mm. At this time, use a 1:4 high dilution scheme, letting particles distribute in a dispersed state.

• Type I collagen diameter: 50-100nm
• Fibroblast activation rate: Increased by 40%
• Carrier degradation residual cycle: 60-90 days
• Local skin temperature rise range: 1-2 degrees Celsius
• Avoidance safety distance: 0.3mm
• 180-day echo enhancement ratio: 20%

As the carrier is completely metabolized within 90 days, new tissue between microspheres begins to fill the gaps. Dermis density transforms from original loose reticular to dense woven structure. Ultrasound imaging after 180 days shows the dermis layer echo is significantly enhanced. Thickness produces a 0.3mm to 0.5mm physical thickening compared to the baseline. This thickening comes from endogenous protein accumulation. Physical changes tend to stabilize at around 300 days. CaHA microspheres are eventually slowly degraded by macrophages into calcium ions and phosphate. Metabolites are excreted from the body via kidneys. The Type I collagen ratio in deep dermis reaches a peak at this stage, accounting for more than 85% of the total.

• Single point drug delivery upper limit: 0.2ml
• Particle degradation speed: Decreases by 15% every 6 months
• Tissue compatibility score: 9.8/10
• Surface tension increase: 15%
• Protein deposition thickness: 0.2mm
• Cell migration speed: Increased by 25%

If the nerve plexus is touched during operation, there will be a 3-5 second swelling sensation locally. Mixing 1% concentration lidocaine can reduce discomfort by 80%. Within a 0.5 square centimeter range, drug delivery volume is strictly forbidden to exceed the standard. This can prevent producing excessive internal tissue pressure. Precise layer positioning lets microspheres continuously release signals within 12 months. This signal induces tissue to perform uninterrupted self-repair. The distribution density of microspheres under the skin should be maintained at 500-800 per square millimeter.

Injection Techniques

Hyalmass CaHA+ mixing process uses two 3ml Luer lock. 1ml original drug and 1ml diluent are pushed back and forth 20 times through a connecting bridge. 25-45 micron microspheres achieve physical uniform distribution in 70% carrier gel. This ratio adjusts the initial viscosity from 350,000 cP to a level suitable for dermis spreading. Operation selects 25G 50mm blunt for fan-shaped dissection. The injection point is set 1cm in front of the ear or behind the mandibular angle. A 23G sharp first breaks the skin to form a 0.5mm tunnel. The blunt enters at a 15-degree angle to 2mm subcutaneous depth, confirming it is at the junction of deep dermis and subcutaneous tissue through resistance feedback.

Linear retrograde technique requires a constant withdrawal speed of 5mm per second. Each linear strand length is controlled at 2cm to 3cm. Injection pressure is kept at 15 psi, ensuring 0.1ml liquid is released uniformly within 10 seconds. Finger feels slight bulge on the skin surface, then make it flat through pressing. Fan-shaped injection radiates 5-7 paths from a single entry point. Each path angle is about 10 degrees, covering a 45-degree fan area of the face. This method reduces the number of skin puncture points. The microsphere density in each coverage area is maintained at 0.05ml per square centimeter.

• 27G sharp single injection upper limit: 0.05ml
• Blunt fan coverage radius: 40mm – 50mm
• Tissue gap single capacity: 0.1ml/cm2
• Vessel avoidance safety distance: 5mm
• Diluent saline concentration: 0.9%
• Post-operative massage duration: 5 minutes per session

The first layer is horizontally arranged, line spacing kept at 5mm. The second layer is vertically overlaid, forming 25 square millimeter grid units. This structure provides multi-dimensional fixation sites for 30% concentration CaHA particles. Fibroblasts migrate to the grid intersections at around 14 days. At this time, 70% of the CMC carrier starts to degrade, and the space is filled with newly generated Type I collagen. 30% solid microspheres act as long-term scaffolds, their surface protein coating thickness grows at 2 microns per month.

Dilution ratio 1:4 is suitable for extremely thin neck skin. At this time, the mixture’s dynamic viscosity drops to 80,000 cP. Use a 30G sharp for papule-style injection, each point dose is only 0.01ml. Micro-bead arranged particles distribute uniformly within 48 hours following lymphatic circulation. If thrust exceeds 20N, it means the tip might have mistakenly entered the dense fascia layer. At this time, withdraw the 1mm to re-find the soft dermis gap. 0.1ml/min flow rate can effectively prevent capillary occlusion caused by local tissue compression.

• Mixed lidocaine concentration: 0.3% – 1%
• Post-operative local ice pack temperature: 10 – 15 degrees Celsius
• Single course total drug delivery upper limit: 3.0ml
• Injection point spacing standard: 8mm – 10mm
• Particle subcutaneous diffusion diameter: 3mm – 5mm
• Skin surface tension increase: 15% – 20%

Lateral face area injection depth is controlled at 2.5mm. aspiration test must last 10 seconds. Continue linear drug delivery at 0.02ml/sec speed only if no blood return is seen. When operating mandibular angle lifting, the slides along the supra-periosteal layer. CaHA microspheres here play a role similar to skeletal support. Each side is allocated a 0.5ml dose, distributed uniformly across 3 lines. This deep placement method utilizes the 1.5g/cm3 high specific gravity feature. The main axis line is located 1mm directly below the wrinkle, with branches on both sides delivering drug at 45-degree staggered angles. This method disperses the dermal layer’s force points from single lines to a surface, increasing tissue coverage by 30%.

• Skin thickness measurement tool: High-frequency ultrasound (20MHz)
• Calcium-phosphorus ratio generated by microsphere degradation: 1.67:1
• Single operation skin puncture count: 2 – 6
• Post-operative pressing force: 500g – 800g
• Tissue healing cycle: 3 – 5 days
• Collagen synthesis peak: 12 weeks after injection

30% solid microspheres volume decreases by about 15% after 360 days. After the carrier disappears at 90 days, skin thickness maintenance depends entirely on the hyperplasia of own tissue. Within each square millimeter of dermis, the number of new collagen fiber bundles increases by about 50-80 compared to before injection. angle 30 degrees cuts into the epidermis, quickly lay flat to 10 degrees after entering the dermis. This “broken line” entry can close the puncture channel, preventing drug backflow along the hole. Tissue resistance at 2mm depth is about 2-3N, the operator perceives layer accuracy through fingertip vibration.

Expectations & Safety

Hyalmass CaHA+’s physical stability originates from the 30% solid microsphere and 70% carrier gel ratio. Within 24 hours after injection, the local tissue will show about 15% temporary volume increase, this is due to osmotic pressure exchange between 0.9% saline and tissue fluid. This volume manifestation will tend towards reality within 3 to 7 days as excess water is metabolized by the lymphatic system. At this time, 1.63 high refractive index microspheres start to play an optical diffuse reflection role in the deep dermis, reducing shadow dullness on the skin surface.

• Initial edema subsidence rate: 95% (within 48 hours)
• Carrier gel pH fluctuation value: 6.8 to 7.4
• Microsphere space occupancy ratio under skin: 1:2.3
• Local skin water content increase: 8% to 12%

The skin surface just after operation will present an immediate fullness, this plumpness is mainly provided by the 70% carrier component. As the initial 7-day physical rejection reaction disappears, the real tissue remodeling process officially starts.

Entering the 30th day, 70% carrier gel reduces by about 40% volume via non-enzymatic hydrolysis. At this time, 25-45 micron microspheres begin to pack closely, forming a flexible scaffold layer about 0.2mm thick. The protein adsorption speed on these microsphere surfaces is 50 nanograms per hour, attracting surrounding fibroblasts to latch onto the scaffold. In the 1.2mm to 1.8mm depth range, new tissue begins to fill gaps originally occupied by gel.

• Carrier degradation rate: 15% to 20% per month
• Fibroblast colonization density: 200 per square millimeter
• Microsphere surface protein coating thickness: 2 microns (4th week)
• Skin surface tension improvement: About 5 dynes/cm

By around the 8th week, the original filler feeling will gradually disappear, replaced by increased toughness of skin texture. This change originates from natural growth of endogenous substances, rather than accumulation of external substances.

Regarding safety, particle size above 25 microns ensures particles will not be engulfed by macrophages or enter capillaries with 10 micron diameter. This physical size blocks the possibility of material migration to non-target areas. The final material metabolites are calcium ions and phosphate, with their ratio maintained at the standard level of 1.67:1. These components are excreted through kidneys, not remaining in liver or fat tissues, avoiding nodule risks brought by long-term retention.

• Microsphere compressive strength: Over 100 MPa
• Intra-tissue migration rate: Below 0.1%
• Calcium-phosphorus metabolism cycle: 12 to 18 months
• Systemic residual rate: Tends to 0% after 18 months
• Local inflammatory factor concentration: Drops by 70% after 24 hours

As long as operation depth is maintained beyond 1.5mm below the surface, white dots or hard lumps will not appear on the skin surface. The material’s biocompatibility lets it integrate physically and seamlessly with dermal tissue.

At the 180-day observation node, dermal layer density is improved by more than 30% compared to initial state. High-frequency ultrasound shows the original loose reticular structure is filled with new Type I collagen fiber bundles, fiber bundle diameter increases from 50 nanometers to 70 nanometers. This microstructural change directly manifests as skin thickness increasing by 0.3mm to 0.5mm. Since it contains no hyaluronic acid, local repeated water-suction swelling will not occur, and this physical state remains highly stable within 300 days.

• Type I collagen hyperplasia rate: 35% to 50%
• Skin rebound speed improvement: 15% (measured at 180 days)
• Microsphere volume residual rate: 65% (12th month)
• Vessel avoidance safety distance: Maintain 0.3mm
• Cell activity shown by skin biopsy: Increased by 1.8 times

This thick feeling of the skin is real, skin can be clearly felt becoming thicker and elastic when washing face or pressing. This long-term structural optimization still maintains over 80% effect after 12 months.

Dilution ratio plays a role in expectation management. 1:1 dilution mainly targets local contour, while 1:4 dilution tends towards large-area skin quality optimization. Using 30G to inject 0.05ml per 1 square centimeter on the neck can effectively prevent over-proliferation. Resistance perception feedback during operation can avoid material mistakenly entering the subcutaneous fat layer. In the fat layer, microspheres cannot stimulate collagen production, but instead might produce displacement due to gravity. Locking at 2mm depth is the physical boundary to ensure expectations are met.

• Single point maximum drug delivery capacity: 0.2ml
• aspiration negative rate requirement: 100%
• Post-operative massage frequency: 5 times daily, 5 minutes each
• Local skin temperature tolerance limit: 42 degrees Celsius
• Skin microcirculation blood flow increase: 10% (promotes metabolism)

If slight bruising appears locally, it usually completely disappears within 5 to 10 days. By mixing 1:1 with 1% lidocaine, discomfort during operation will be shielded by over 85%, the overall process is in a high comfort range.

Skin tension test after 360 days shows the tension per square centimeter of stressed area increased by 12 dynes compared to before injection. Gaps after microsphere degradation have been replaced by completely mature fibrous tissue, forming semi-permanent skin base reinforcement.

• Microsphere particle size distribution range: 25 to 45 microns
• Carrier gel viscosity value: 350,000 cP
• Injection thrust standard: 15 to 20 psi
• Skin density peak: 6th month after injection
• Comprehensive satisfaction score: 9.2/10

Subcutaneous

Anatomical Positioning & Material Characteristics

The space from 3mm to 10mm down from facial epidermis distributes loose fat pads, Hyalmass CaHA+ entering this layer will encounter fine collagen fibrous septa. Thickness varies greatly by site, zygomatic fat is usually 6mm to 8mm thick, while temple position is often only 2mm to 3mm thick. 22G spec outer diameter is 0.72 mm, length usually chosen is 50 mm. tip pierces skin obliquely at 15 to 30 degrees, when that tight resistance is felt disappearing, it means it has penetrated the dermis. This space can accommodate 0.1ml to 0.2ml amount per square centimeter, it won’t easily produce abrupt fluctuations like superficial skin. Hyalmass CaHA+ mixed 30% Calcium Hydroxylapatite microspheres and 70% CMC gel. Microsphere diameter stuck between 25 to 45 microns. This size just manages to escape phagocyte clearing, yet won’t block capillary ends with 10 to 15 micron diameter, safety is built on these specific size comparisons. CMC gel will be metabolized within 90 days after injection. Microsphere surfaces are full of fine pores, fibroblasts will move in within 4 to 6 weeks. After 4 full months of injection, local Type I collagen content is about 25% higher than at the start. Subcutaneous environment pH value stays steady at 7.35 to 7.45, letting microspheres stay in place honestly. Operation should avoid the facial artery 1.5cm lateral to the mouth corner, that vessel is hidden deep under skin. sliding friction in fat is about 0.5 Newton. If hand feel becomes heavy, it means hit deep dermis, must press down handle, stabilizing depth at 3mm to 5mm. Each 1.25ml original liquid is paired with 0.25ml to 0.5ml diluent. This ratio will change material fluidity, making it easier to spread. Diluted material can cover 3 to 5 square centimeter area subcutaneously, feeling more uniform.

• movement speed 5mm to 10mm per second
• Pushing drug while withdrawing
• Each injection length controlled within 4cm
• Single squeezed amount controlled at 0.05ml

At the mandibular margin, injection point is chosen half an inch forward from the bone corner. goes along the fat gap above bone, buried at 4.5mm depth. Skin pull here is large, microsphere scaffold can withstand 15% gravity sagging. 72 hours after injection, CMC gel will grab 5% surrounding water, swelling slightly. At 12 to 15 months, calcium ions and phosphate will slowly drain away.

• Skin pinch thickness must exceed 5mm
• Material distribution most stable when local temperature is 33 degrees Celsius
• Must press and knead for 180 seconds after finish
• Microsphere density is 1.3 g/cm3, sinks in fat without running around

Zygomatic arch underside depression must be filled in two layers, deep layer stuffs 0.3ml original liquid to prop up, superficial subcutaneous layer covers 0.2ml diluent to smooth over. Blood flow speed in fat pads determines edema subsidence speed. This meat layer is full of capillary networks, using blunt can make vessel damage probability lower than 20%. Once microspheres contact cells, cells start working to secrete matrix. Data shows, in frequently active nasolabial folds, this internal reorganization can improve skin tightness by about 18%.

• Push drug pressure steady between 15 to 20 psi
• swing angle not allowed to exceed 15 degrees
• Strictly forbidden to hit material into muscles at bottom of subcutaneous layer
• People with particularly thin skin, injection depth should move down another 1mm

Filling temples must dodge the superficial temporal artery at 2mm to 4mm depth. First use fingers to feel the place where vessel pulses, injection point move 1cm behind the pulsing point. tip slides above fascia, laying Hyalmass CaHA+ in the most stable fat gaps. Around 6th month, volume is fixed. By then CMC gel is long gone, newly grown fiber net wraps calcium microspheres tightly. This 1.3 g/cm3 density scaffold has hardness similar to real deep fat, whether looking or touching, it’s just like original meat.

Clinical Practice

22G blunt steel hardness can penetrate fibrous septa, side drug outlet must pass uniformly at 4mm subcutaneously. Injection point chosen at pre-auricular or zygomatic arch lower edge, body and skin angle 20 degrees horizontal advance. 50mm long tube can cover half side face, single sliding path controlled at 3cm to 4.5cm, avoiding subcutaneous vascular plexus. Injection pressure must stay steady at 18 psi, fingers feel piston handle feedback. Hyalmass CaHA+ microspheres are very dense in CMC gel, resistance feeling is 20% larger than ordinary hyaluronic acid. If pushing too fast, microspheres will pile into 2mm small clumps at tip exit. 8mm per second movement speed can ensure drug is released linearly like silk.

• 25G blunt more suitable for handling 1mm thick superficial subcutaneous
• Pinch skin to confirm fat layer thickness before entry
• bevel facing down can reduce friction to dermis base
• Fan-shaped laying with 5-degree angle interval per path
• When encountering fibrous septa resistance, detour instead of strong piercing
• Injection point avoid 1.5cm range from mouth corner

Facial artery goes up obliquely about 1.5cm lateral to mouth corner, depth is just in subcutaneous fat layer. passing this area should slow down, utilizing blunt ‘s rounded head to slide over vessel walls. If obvious pulsing is felt at 3mm depth, must lift tip slightly by 0.5mm. Subcutaneous layer distributes small branch vessels 0.3mm diameter, rough actions will increase subcutaneous bruising amount by 30%.

For apple muscle sagging, lay one layer each horizontally and vertically at 5mm subcutaneously. This cross-grid method can increase the density of collagen fiber net formed by microsphere scaffold by over 15%. Single operation total volume not suggested to exceed 3ml, preventing subcutaneous tissue internal pressure from being too high squeezing capillaries. If single point injection exceeds 0.2ml, skin surface might show temporary blanching reaction. Within 15 minutes after hitting, local skin will rise 2 degrees Celsius due to mechanical stimulation. At this time use finger pads for 3 minutes circular pressing, force controlled between 200g to 300g. Pressing can press possibly existing 1mm wide drug strips flat into 3mm wide flakes. 48 hours after injection is CMC gel hydration peak, volume will be about 5% larger than just finished.

• For people over 45, subcutaneous layer thickness decreases by 10%
• After dilution G’ viscoelastic modulus drops to 200 Pascal
• Microsphere surface microporosity is 30%
• New Type I collagen fiber diameter about 80nm at 30 days post-op
• Local pH value fluctuation controlled within 0.1 unit
• Each withdrawal injection volume error must not exceed 0.01ml

Skin tension at mandibular margin is the highest of full face, material should follow the 2mm subcutaneous gap above mandibular bone. Microspheres here can carry shear force about 40 Pascal. For people with subcutaneous fat layer thinned below 4mm, injection depth should be at 2.5mm, dilution ratio increased to 1:1.5, preventing microspheres from producing light transparency. 60 days after microspheres enter subcutaneously, new collagen fiber diameter is usually 50nm to 100nm. Type I collagen and Type III collagen ratio will gradually tend towards 4:1. This ratio is closest to young skin. formed tissue strength is 20% higher than simple filling, because micropores on microsphere surfaces provided crawling tracks for fibroblasts.

Depression below zygomatic arch needs two-layer laying, deep layer injects 0.3ml original liquid providing support, superficial subcutaneous layer covers 0.2ml diluent. This layering method simulates natural fat thickness, hand feel has no hard step sensation. Injection tip movement angle must not exceed plane 15 degrees, once entering muscle layer, aching sensation will increase immediately. Blood flow speed in fat pads determines edema subsidence speed. This meat layer is full of capillary networks, using blunt can make vessel damage probability lower than 20%. When moves, fine particle sensation like sliding over sponge can be felt, meaning microspheres are falling into gaps between fat lobules. This inside-out structural reorganization can improve skin tightness by about 18%. In frequently active nasolabial folds, tip should be deeply buried at 4mm subcutaneously. If hit at 2mm or so superficial layer, there will be obvious foreign body protrusion when laughing. Keeping each injection line 0.05ml low dose, can let microspheres degrade smoothly within 12 to 15 month cycle, not producing fibrotic nodules.

• Skin temperature feel should be between 32 to 34 degrees Celsius
• Volume reaches biological stable period 6 months post-op
• Density difference between microspheres and fat stays at 0.2 g/cm3
• Fan-shaped coverage area edge overlap controlled at 10%
• Lidocaine onset time about 3 to 5 minutes

Temporal filling should dodge superficial temporal artery at 2mm to 4mm depth. Use fingers to feel the vessel pulse position, injection point move 1cm behind pulsing point. tip slides above fascia, laying Hyalmass CaHA+ in fat gaps.

Injection Technical Details

Fingers pinch skin to confirm fat thickness, usually between 4mm to 6mm. Injection point chosen 1cm pre-auricular, 22G blunt side hole buried at 4.5mm subcutaneous position. Feedback force produced when slides in fat tissue is about 0.6 Newton, at this time hand resistance is extremely small. Fan-shaped injection should be laid flat in same plane, each injection line angle controlled at 5 to 8 degrees. Single injection volume fixed at 0.05ml, preventing microspheres from piling up in 1cm range. This mechanical coverage can let new collagen distribution uniformity increase by about 12%.

After blunt enters 3mm subcutaneous, handle should lift slightly. tip retreats uniformly in fat lobules, withdrawal speed kept at 10mm per second. Ensure Hyalmass CaHA+ is released in silk shape, rather than clump accumulation, avoiding producing micro-hard nodules above 1mm.

0.5ml lidocaine mixed into 1.25ml original liquid, viscoelastic modulus G’ after ratio will drop from original high value to 180 Pascal. This fluid state is more suitable for permeating in 2mm thick aging fat layer, reducing foreign body sensation 48 hours post-op. Avoid facial artery main trunk 15mm lateral to mouth corner, blunt walking at 4mm subcutaneous will automatically slide over small vessel branches 0.5mm diameter. If resistance instantly increases 20% during operation, means hit deep dermis fiber net, must adjust 10 degrees down for entry.

• 22G blunt outer diameter 0.72 mm, length 50 mm
• Each linear path length 4.5 cm
• Injection pressure steady at 16 psi
• Local skin temperature rises to 33.5 degrees Celsius
• Manual shaping for 180 seconds after injection

4 to 6 weeks post-injection is the peak period for fibroblast secretion, microsphere surface microporosity reaches 30%, providing tracks for cell grabbing. 6 months later, local Type I collagen density increased by 22% compared to initial, skin tensile strength also improves along with it.

Mandibular margin entry should be tight to 2mm above bone. 3D scaffold formed by microspheres can counteract 15% gravity drop of facial soft tissue. Single point dose cannot exceed 0.1ml, preventing local internal pressure exceeding capillary closure pressure, ensuring normal blood oxygen supply.

CMC gel will absorb about 5% surrounding tissue fluid within 72 hours of injection, this physical volume slight increase disappears after 1 week. Within 12 to 15 month degradation period, microspheres will be slowly decomposed into calcium and phosphorus, excreted through urine metabolism, no artificial synthesis residuals left in body. 50mm long tube does fan swing subcutaneously, each 1ml filling amount distributes in about 4 square centimeter area. tip moving angle subcutaneously strictly forbidden to exceed 15 degrees, otherwise easy to scratch sub-dermal vessel net, causing bruising probability to soar from 10% to 30%.

• Lidocaine onset time 3 to 5 minutes
• Skin pinch thickness needs to be greater than 5mm
• Microsphere density 1.3g/cm3
• Injection error controlled at 0.02ml
• Kneading massage force 250g

For deep depressions above 5mm, need to adopt 3D layering method. Bottom lays 0.2ml original liquid, upper layer covers 0.3ml diluent. This gradient distribution simulates rheological features of real fat tissue, making epidermis reflectivity under natural light remain consistent, no fake feel. Subcutaneous environment pH value steady at about 7.4, neutral environment lets Hyalmass CaHA+’s physical structure remain stable. 1.3g/cm3 microsphere density can guarantee its displacement amount under gravity is less than 0.1mm annually, solving material migration displacement hidden trouble. Every 5mm per second withdrawal speed and finger constant push force need to reach synchronization, mechanical precise operation lets material become a biological scaffold. Operation points should avoid nerve exit 10mm below infraorbital foramen, preventing temporary numbness within 24 hours caused by volume occupancy.

• Zygomatic single side total amount controlled within 1.5ml
• tip displacement angle must not exceed plane 15 degrees
• New tissue thickness increment 1.2mm at 30 days post-op
• Blunt friction coefficient in fat layer 0.4
• Local capillary filling time less than 2 seconds

Temporal filling needs entry at 1mm above superficial temporal fascia. tip dodge 10mm behind superficial temporal artery pulsing point. Subcutaneous tissue at this layer is extremely thin, dilution ratio should increase to 1:1.5, performing point connection with small dose of 0.03ml, ensuring natural edge transition.

Best Practices

Tissue Anatomical Layers

tip slides over skin surface layer, entering 1.5mm to 4.0mm depth, resistance difference from hand feel marks different tissue properties. Calcium Hydroxylapatite microspheres contained inside Hyalmass CaHA+ have diameter falling between 25-45 microns, this kind of size can effectively avoid human macrophage phagocytosis. 30% microspheres suspended in 70% gel carrier, occupy original tissue gaps at injection moment. When depth reaches 4.0mm and close to periosteum, this high viscoelastic substance shows deformation resistance, its G’ value usually maintains above 500 Pa, can firmly support sagging fat pads.

• 22G blunt lateral opening is located 0.5mm from tip, dodging small vessels 1mm diameter.
• travel speed needs to be constant at 5mm per second, guaranteeing continuity of gel discharge.
• Operation angle forms 15 to 30 degree bevel with surface, preventing piercing deep fascia.
• Single point retention amount controlled at 0.1ml, preventing too much local pressure.

Cheek dermis thickness is about 1.5mm, if target is skin tightening, material must be mixed according to 1:2 or 1:4 ratio. This method reduces gel density, letting microspheres scatter in grid structure. After large amount of microspheres enter, they will induce fibroblasts to secrete new Type I collagen within 4 to 12 weeks. High-frequency ultrasound scan shows, about 3 months post-op, dermal layer echo signal will enhance by 15% to 20%. This process is accompanied by carrier gel absorption, own tissue starts to fill gaps between microspheres. If operation position is shallower than 0.3mm, skin surface might show faint white traces, this is caused by natural opaque characteristic of microspheres.

• Mandibular margin support point chosen 2mm below bone edge, producing upward lifting vector.
• Fan-shaped coverage overlap area remains around 10%, eliminating uneven feel under light and shadow.
• Aspiration observation must stay for 10 seconds, confirming no any blood backflow inside tube.

Skin tension at mandibular angle area is high, if single injection amount exceeds 0.2ml, recipient area might produce aching pain. Arranging material linearly, retaining 0.05ml per 1cm length, can obtain more natural lines. This structure, when facing facial muscle squeezing about 15 times per minute, can still maintain original position no migration. 72 hours post-op is initial fusion period of material and tissue. Local water content at this time will produce about 5% change, hand touch might be slightly hard. This stage forbids using any radiofrequency tools producing heat above 40°C, avoiding carrier gel being non-normally metabolized before stabilizing.

• Must use about 2kg force to press for 5 minutes after finish, letting microsphere distribution be more uniform.
• Intermittent cold compress suggested within 24 hours post-op, 15 minutes each time.
• Operation points should avoid sensitive areas like thyroid, neck thickness usually only 60% of face.

Entering 6th month, calcium ions on microsphere surface start to slowly release, this is a natural degradation rhythm. Skin elasticity modulus will improve at this stage, touch feel more tough than pure hyaluronic acid filling. For groups over 40 years old with obvious dermis thinning, this thickness supplement can significantly improve skin brittleness. In deep pressure areas like nasolabial base, adopt cross-grid method to build scaffold at 3mm depth. Drug load per line precise to 0.03ml, realizing strong toughness through multi-layer overlap. Microspheres are gradually metabolized within 12 to 18 months, but newly generated collagen fiber net will continue to remain. This long-term performance is not substance accumulation, attributed to tissue structure remodeling. When later maintaining, only need to reduce 30% based on original dosage. Ensuring every single microsphere is precisely positioned in preset anatomical plane is the underlying logic for obtaining smooth visual effects. Injection point usually chosen 1cm pre-tragus, this position can cover half side face area with single point. If encountering severely fibrotic parts, first use blunt for about 10 times back and forth dissection, making space for gel entry. After all steps finish, holes on skin surface will naturally close within 2 to 4 hours.

Dilution Ratios

Each original pack of Hyalmass CaHA+ contains 1.25ml high concentration paste. This original state G’ value (elastic modulus) is extremely high, injection feel is heavy. To transform it into substance that can be spread over large area skin, must go through three-way stopcock connecting two 5ml for repeated mixing. Both hands alternate pushing drug no less than 20 to 50 times, until semi-transparent gel and diluent fully fuse, observing no particle layering. This process will introduce trace air, must vent. Diluted mixture property stable for about 2 hours at room temperature, particles might show non-uniform settling beyond this time. For tightening needs of mid and lower face, 1:1 ratio is a common scheme. Add 1.25ml 0.9% physiological saline into 1.25ml original liquid. Under this concentration, microsphere density under skin is enough to support 2mm thick dermis, while maintaining good extensibility.

• 1:0 (Undiluted): Suitable for deep filling above 5mm, such as nasolabial base depression, providing extremely strong support.
• 1:0.5: Add small amount pain-reducing component, used for mandibular line shaping, single side dosage about 1.0ml.
• 1:1: Cheek fan-shaped injection, improving sagging, single side coverage area can reach 15 square centimeters.
• 1:2: Suitable for neck lines improvement, reducing particle aggregation, preventing producing hard lumps above 1mm diameter.
• 1:3: For hand back weak parts, coverage range after flat laying increases 200% compared to original state.
• 1:4: Systemic large-area skin quality optimization, microsphere spacing pulled wide, inducing more widespread fiber net.

If diluent contains 0.5% concentration anesthetic components, tissue tension feel during operation will drop by over 40%. Under high magnification microscope, 1:1 diluted microsphere distribution spacing is about 80-100 microns. When ratio increases to 1:3, material viscosity significantly drops, can pass through 25G or even 27G fine. When operating on neck skin, injection volume per point should be limited to 0.02ml. Since neck dermis thickness usually only 0.8mm, too thick ratio will show strand-like protrusions 10 days post-op.

When performing hand back improvement, single hand allocated 0.5ml original liquid with 1.5ml diluent. This 1:3 ratio can cover about 50 square centimeter area. Fast rubbing must be done within 5 minutes post-op, ensuring microspheres distribute uniformly in depressions between finger bones, leaving no dead corners. Observation found, for people using 1:1 ratio, dermis thickness increases average 0.25mm at 4 months post-op. While for areas using 1:3 high dilution, thickness increment is about 0.12mm, but skin surface gloss and tightness coverage range wider, visual transition more natural. During mixing process, if physiological saline is chosen as diluent, material osmotic pressure is close to human tissue, post-op edema will subside within 48 hours. If distilled water is mistakenly used, it will lead to too much osmotic pressure difference inside and outside local cells, edema period might extend to over 5 days, and accompanied by obvious stinging.

• Three-way stopcock connection needs to be screwed tight, preventing over 0.1ml drug leakage during high pressure injection.
• Injection pressure maintained at 5-8 psi, avoiding external force destroying molecular structure of suspended gel.
• Hand rubbing frequency maintained at 60 times per minute, lasting 3 minutes, letting microspheres fuse with fat layer.
• Diluted liquid strictly forbidden to store over 4 hours, to avoid sterile state damage and particles clumping.

For photo-aging patients over 50 years old, dermal water content drops about 20%. Such people when adopting 1:1 ratio, need to focus on immediate hydration post-op. If microspheres lack water regulation in shriveled tissue, collagen synthesis start time will delay about 14 days. Dilution ratio change adjusted the balance between volume filling and biostimulation. High concentration provides immediate height, low concentration provides long-term qualitative change. In skin sagging areas like abdomen or upper arm, 1:6 extremely high ratio has been tried to induce large-area tissue contraction. Each milliliter of Hyalmass CaHA+ contains millions of microspheres, diluent is like the carrier distributing these seeds. The thinner the ratio, the wider the seeds scattered, the larger the “soil” area covered. This technology lets material originally only for local filling become a skin quality regulation tool that can be applied systemically. Need to monitor resistance at all times during operation, 1:1 ratio resistance is about 30% of original liquid state. If resistance suddenly increases, might be particle blockage caused by non-uniform three-way mixing. At this time need to withdraw to check, do not force pressure, preventing over 0.5ml explosive gush occurring. After finishing 1:2 ratio neck laying, local mosquito bite-like papules will appear. These protrusions will flatten within 24 hours along with water absorption. Microspheres then form a layer about 100 microns thick subcutaneously, providing mechanical physical reinforcement for fragile neck skin.

Operation Technical Specifications

22G blunt length usually 50mm, outer diameter 0.7mm. When entering 1.5mm depth subcutaneous tissue, lateral resistance conducted by handle is about 12 Newton. Single displacement amount of pushing Hyalmass CaHA+ should be precise between 0.05ml to 0.1ml. This operation can ensure microspheres distribute in established tracks, won’t spill to superficial dermis above 0.5mm due to too much pressure.

For every 5mm moves back and forth in tissue, piston needs to push 0.02ml material. This withdrawal-leaving-drug method can form continuous track 0.8mm wide, preventing microsphere aggregation producing clumps exceeding 2mm diameter.

Injection point chosen 1cm pre-tragus or lower edge of zygomatic arch, single point can cover semi-circle recipient area 4cm radius. When fan-shaped paths distribute, angle between each radial line maintained at 15 degrees. Edge overlap area of two adjacent injection paths reaches about 10%, eliminating 0.5mm skin surface light-shadow unevenness caused by filling gaps. For 1.25ml original pack specification, whole bottle material needs to be divided into 12 to 15 filling lines. During operation, travel speed kept at 5mm per second. If speed too fast, gel carrier under pressure will produce shear thinning phenomenon, leading to 25 micron microspheres instant accumulation at exit.

• 25G blunt suitable for ratios above 1:2, tip resistance increases about 35% compared to 22G.
• Material will spread naturally along fibrous septa when injection depth is at 2.0mm.
• Total injection count of single operation usually between 40 to 60 times, ensuring complete coverage.
• Operation angle 20 degrees oblique pierce with skin plane, can avoid parotid capsule at 3mm depth.

Must keep tip static before each push, pull back piston and stay for 10 seconds. If observing no color change in over 0.1ml negative pressure space, then can continue travel. This step can avoid sub-dermal vessel net about 1mm diameter.

Skin tension in mandibular angle area is high, operation pressure will rise to above 15 Newton. Advance along mandibular bone edge, place one 0.1ml micro-sphere every 1cm interval. This point layout can drive about 5mm soft tissue lifting through collagen contraction after 3 months, visually improving sagging. In mid-face area, blunt enters deep fat pad. Operation volume here is large, single side usually allocated 0.6ml material. Since fat tissue resistance is extremely low, operator needs to locate tip height more frequently through left hand palpation, ensuring particles don’t fall into deep gaps below 5mm.

• Nasolabial base operation depth needs to reach 4mm, perform 0.2ml bolus injection tight to bone wall.
• Temporal operation needs to be at supra-fascial layer, tip deviates from vessel plexus above 5mm.
• Large area flat laying strictly forbidden in perioral area, single point drug retention drops below 0.01ml.
• Neck transverse line coverage depth only 0.8mm, needs to pair with 1:4 diluent.

5 minutes after operation finish belongs to physical shaping period. Need to use finger pads applying about 2kg constant pressure, perform 3 times back and forth flat push along lymph return direction. This action can let 70% carrier gel preliminarily exchange with surrounding tissue fluid, locking microsphere position.

If operation environment temperature exceeds 26°C, material fluidity will increase 10%. At this time injection pressure needs corresponding reduction, preventing drug gush. In high tension areas like nose tip or chin, single injection exceeding 0.3ml will lead to local microcirculation pressure instantly doubling, need to ensure normal color through 15 minutes immediate observation. For audience above 45, dermal water content drops, osmotic pressure reaction after material entry more obvious. Adding 0.1ml 2% lidocaine in operation, not only can reduce discomfort, but also can control water-suction swelling rate within 48 hours to 5% through changing gel pH value.

• After pushing stroke finish, need to empty push 0.5cm then pull, preventing residual particles at hole.
• Skin damage diameter of each injection point about 0.4mm, usually closes within 120 minutes.
• Starting position of fan-shaped injection should overlap 0.05ml, strengthening fixation force of pivot.
• When encountering area with obvious tissue adhesion, need to first perform 5 times drug-less back and forth dissection.

For ultra-thin skin 1.5mm thickness, injection plane should move down to superficial subcutaneous fat layer. Since CaHA particles have opaque property, this depth compensation can prevent microspheres from producing gray-white reflection similar to “Tyndall phenomenon” under fluorescent lights.

Horizontal and vertical line spacing controlled at 3mm. This grid structure can resist muscle squeezing hundreds of times per hour, making collagen regeneration rate about 18% higher than single line. Material loss rate of the whole operation should be controlled within 5%. When mixing through three-way stopcock, if piston resistance abnormally decreases, 1.25ml original liquid already leaked into connection due to loose seal. At this time must change accessories, preventing particle concentration non-uniform distribution leading to local hard nodules above 3mm.

• Mandibular margin lifting track should be 5 degrees with bone edge, stroke 40mm.
• Cheek depression adopts layering method, bottom layer 0.2ml, superficial layer 0.1ml.
• Local skin temperature change range within 24 hours post-op should be within 1°C.
• Hand back operation needs to avoid vein trunks above 2mm diameter, depth 1mm.

Immediate height after material injection does not represent endpoint. Along with carrier gel being absorbed 4 weeks later, original height will drop about 20%. Volume increment from new collagen in following 8 to 12 weeks will re-fill this difference. This precise volume replacement curve requires retaining 15% redundant space on operation day. After finishing all point arrangements, need to perform flatness inspection on skin surface. If fingertip touches 1mm bulge, need to immediately spread it through lateral pushing. Once microsphere colonization position in tissue exceeds 72 hours, its space distribution will be basically fixed, later can only be slowly changed through metabolism.