Artificial limb manufacturing mold without joint line

Abstract

The utility model discloses a joint-line-free artificial limb manufacturing mold in the technical field of artificial limb molds, which comprises a hand back mold shell, a palm mold shell, a hand mold sleeve, a port separation blade and an artificial hand inner mold, the hand mold sleeve filled with the artificial hand inner mold is sealed in the mold cavity formed by the hand back mold shell and the palm mold shell through the end opening blocking piece, the mold installation process can be optimized, meanwhile, the artificial limb leather sheath can be directly formed at a time, an integral structure is adopted, and meanwhile, no joint line exists, so that after the silica gel leather sheath is subjected to injection molding, the production efficiency is greatly improved. A joint line does not need to be ground, so that the manufacturing process is greatly simplified, and the manufacturing of the artificial limb leather sheath is more efficient; due to the fact that the joint line does not need to be ground, the outer surface of the artificial limb leather sheath is smoother, the joint line does not exist, later repair and re-coloring of the ground position are not needed, the whole leather sheath has no color difference, and the beauty artificial limb leather sheath manufactured through the device is more vivid.

Description

Technical Field

[0001] This utility model relates to the field of prosthetic mold technology, and in particular to a prosthetic manufacturing mold without parting lines. Background Technology

[0002] A prosthesis is an artificial prosthesis specially designed, manufactured, and fitted using engineering techniques to compensate for amputees or those with incomplete limb loss; it is also known as a "surgery limb." Its main function is to replace some of the functions of the lost limb, enabling amputees to regain a certain degree of self-care and work ability. It is suitable for amputees due to illness, traffic accidents, workplace injuries, sports injuries, and other causes.

[0003] Prostheses come in many varieties, including functional and aesthetic prostheses. There are also designs for prostheses that can be controlled via electromyography (EMG). The most challenging prostheses to make are for the upper limbs, while the lower limbs are relatively simpler, requiring only stable support and ease of walking. The upper limbs, however, involve more diverse needs, including mobility, aesthetics, and even sports-related requirements.

[0004] Functional prostheses: These are non-mechanical functional prostheses with simple functions. These upper limb prostheses utilize modular kits to allow for the replacement of different prostheses in different situations. For example, there are handle-type prostheses for gripping long poles, spoon-type prostheses for eating, and handle prostheses for cycling, suitable for bicycle handlebars.

[0005] There are functional prostheses with mechanisms. Most of these lower limb prostheses are equipped with joints and corresponding motion assistive devices (hydraulic, pneumatic, spring), and some even have electronic power feedback systems, etc., to achieve a certain degree of arm movement.

[0006] Cosmetic prostheses:

[0007] Prosthetically pleasing devices, such as cosmetic prostheses, can significantly help amputees build confidence and self-esteem. These prostheses often require makeup or coating, primarily to blend skin folds and nail colors, aiming for a lifelike appearance.

[0008] The primary function of cosmetic prostheses is aesthetics. Currently, the main material for these prostheses is silicone, with colored silicone being the closest material to human skin in terms of feel and color. However, silicone prostheses are manufactured using injection molding. Silicone is relatively soft and difficult to stably support, so the prosthesis requires a rigid internal filler as a skeleton, and then an external silicone sheath, also called a skin sleeve, is wrapped around it. Similarly, cosmetic prosthetic feet also have an internal skeleton covered by a silicone mold. The skeleton is usually made of lightweight wood and shaped into a fixed form. The external finger shapes are mostly fixed as well. A few prostheses allow for slight finger joint movement, but all of these consist of an external prosthetic skin sleeve and an internal supporting skeleton.

[0009] The design of the prosthesis skeleton primarily considers functionality and support, while the sheath only concerns durability and a lifelike appearance. This type of cosmetic prosthesis sheath requires an external, completely sealed skin sleeve, similar to human skin, to house the prosthesis skeleton. During the design process, an opening is created at the rear end where it connects to the residual limb. This opening is typically located inside an unseen sleeve or pant leg for connection and installation. Molded silicone prosthesis sheaths have a parting line on their surface due to the mold, an inherent defect in mold making. Currently, the parting line protrudes from the outside of the sheath, forming a line. Since molded silicone has high toughness, sanding will roughen the parting line. Furthermore, the silicone sheath contains many air bubbles, intentionally filled during injection molding to increase the silicone's elasticity, making it more similar to the feel and resilience of skin. Therefore, the sanding of the leather case cannot penetrate deep into the material, otherwise it will expose tiny pores, resulting in an uneven surface. Currently, the main method is to cut first, then sand lightly to avoid sanding into the leather material, and then touch up the color. If the sanding thickness is accidentally too much and air bubbles are exposed inside the leather case, it will need to be repaired. Sanding this parting line is very tedious. The time spent on color matching, injection molding, and molding processes in producing a simulated prosthetic limb case is not as long as the time spent on sanding and repairing the parting line. Therefore, sanding the parting line greatly increases the difficulty of manufacturing cosmetic prosthetic limb cases.

[0010] Based on this, this utility model designs a prosthesis manufacturing mold without parting lines to solve the above problems. Utility Model Content

[0011] The purpose of this invention is to provide a mold for manufacturing prostheses without parting lines. This mold optimizes the mold installation process and allows for the direct one-time molding of the prosthesis skin, creating a one-piece structure without any parting lines. Therefore, after the silicone skin is injection molded, there is no need to grind the parting lines, greatly simplifying the manufacturing process and making the production of prostheses more efficient. Because there is no need to grind the parting lines, the outer surface of the prosthesis skin is smoother. Moreover, without parting lines, there is no need for later repairs or recoloring of the ground areas, resulting in no color difference in the overall skin. The cosmetic prostheses produced by this invention are also more realistic.

[0012] This utility model is implemented as follows: a mold for manufacturing a prosthesis without parting lines, comprising:

[0013] Back of hand mold shell, palm mold shell, hand mold sleeve, port baffle and artificial hand inner mold;

[0014] Both the back-of-hand mold shell and the palm mold shell are molds for prostheses; the back-of-hand mold shell and the palm mold shell can be separated and assembled into a sleeve shell of a complete prosthesis; the sleeve shell assembled from the back-of-hand mold shell and the palm mold shell is hollow inside, and the rear end of the sleeve shell assembled from the back-of-hand mold shell and the palm mold shell is open.

[0015] The hand mold sleeve is a complete closed flexible sleeve with an opening at the rear end. The back of the hand mold shell and the palm mold shell can be separably wrapped around the outside of the hand mold sleeve. The hand mold sleeve is a mold for the outer contour of the prosthesis. An annular mold sleeve retaining ring is provided on the edge of the rear end opening of the hand mold sleeve. The plane of the mold sleeve retaining ring is perpendicular to the plane of the rear end opening of the hand mold sleeve.

[0016] The rear openings of both the back-of-hand mold shell and the palm mold shell are recessed towards the front end and are provided with retaining grooves; the retaining grooves at the rear ends of the back-of-hand mold shell and the palm mold shell are spliced ​​together to form a complete annular groove, the mold sleeve retaining ring can be separably fitted into the retaining groove, and the outer side of the mold sleeve retaining ring is flush with the outer end face of the retaining groove, and the rear opening of the hand mold sleeve is on the same plane as the rear opening of the sleeve shell composed of the back-of-hand mold shell and the palm mold shell.

[0017] The inner mold of the prosthetic hand is a closed rigid model. The shape of the inner mold of the prosthetic hand is the same as that of the prosthesis. The inner mold of the prosthetic hand can be detachably inserted into the inside of the hand mold sleeve.

[0018] The port baffle is a flat plate structure, and the port baffle can be detachably covered at the rear end opening of the hand mold sleeve, the back of the hand mold shell, and the palm mold shell; the port baffle also has vent holes and injection holes; the vent holes and injection holes penetrate through both sides of the port baffle;

[0019] The rear ends of the back-of-hand mold shell, the palm mold shell, and the hand mold sleeve are all sealed and locked with port baffles by bolts.

[0020] Furthermore, the splicing surfaces of the back of the hand mold shell and the palm mold shell are flat and fit together, and the outer surfaces of the back of the hand mold shell and the palm mold shell protrude outward; the inner surface of the back of the hand mold shell is a back of the hand mold groove that is recessed outward; the inner surface of the palm mold shell is a palm mold groove that is recessed towards the palm side; the back of the hand mold groove and the palm mold groove cover each other to form a sealed cavity with an opening at the rear end;

[0021] The back of the hand mold groove and the palm mold groove are tightly fitted to the outside of the hand mold sleeve;

[0022] The back of the hand mold shell is provided with multiple mounting blocks and multiple locking holes;

[0023] Multiple mounting blocks and multiple locking holes are arranged around the edge of the back of the hand mold groove, and the mounting blocks and locking holes do not contact the back of the hand mold groove;

[0024] The palm mold shell is provided with multiple positioning slots and multiple positioning nuts;

[0025] Each of the positioning nuts is fitted into the splicing surface of the palm mold shell, and the positioning nut is located inside the splicing surface of the palm mold shell;

[0026] Multiple positioning slots and multiple positioning nuts are arranged around the periphery of the palm mold groove, and each positioning slot and each positioning nut is associated with the palm mold groove;

[0027] Each of the positioning nuts on the back of the hand mold shell and the palm mold shell in the assembled state corresponds one-to-one with a locking hole position.

[0028] Furthermore, the hand mold sleeve is an integral sleeve structure molded from silicone, and mold sleeve positioning blocks are also provided on the left and right sides of the outer wall of the hand mold sleeve;

[0029] Positioning grooves are also provided on the splicing surfaces of the back of the hand mold shell and the palm mold shell;

[0030] The positioning groove is recessed downwards and formed on the splicing surface of the back of the hand mold shell and the palm mold shell. The splicing of the positioning groove on the back of the hand mold shell and the palm mold shell forms a square cavity. The mold sleeve positioning block can be separably fitted into the cavity spliced ​​by the positioning groove.

[0031] The positioning block and the positioning groove are in clearance fit, with a clearance not exceeding 1mm.

[0032] Furthermore, the inner mold of the prosthetic hand is a solid hand model made of resin;

[0033] The rear end of the prosthetic hand inner mold is flat, and multiple prosthetic hand nuts are embedded in the rear end of the prosthetic hand inner mold.

[0034] Furthermore, the port baffle is a transparent PVC plate, and the rear end faces of the back of the hand mold shell and the palm mold shell are within the coverage area of ​​the port baffle;

[0035] The port baffle is also provided with multiple positioning holes, which are evenly distributed in two rings on the port baffle. The positioning holes in the inner ring correspond one-to-one with the positions of multiple dummy nuts.

[0036] Multiple pre-embedded nuts are embedded at the rear ends of both the back-of-hand mold shell and the palm mold shell;

[0037] The positioning holes on the outer ring correspond one-to-one with the positions of the pre-embedded nuts opened at the rear ends of the back-of-hand mold shell and the palm mold shell.

[0038] The beneficial effects of this utility model are: 1. This utility model still uses the mold-making method of mold assembly, which makes it more convenient to fill the hand mold sleeve inside, making the placement of the prosthetic limb sleeve and the outer and inner molds of this device smoother and more convenient. Through the splicing and docking method of the back of the hand mold shell and the palm mold shell, the installation of the hand mold sleeve and the prosthetic hand inner mold is more convenient and the operation is simpler.

[0039] 2. This device incorporates a hand mold sleeve. The back and palm mold shells shape and constrain the outside of the hand mold sleeve, preventing deformation due to high temperatures and the fluid material used in injection molding. This ensures the stability of the hand mold sleeve's external shape, providing effective support and constraint. Furthermore, the inner mold of the prosthetic hand works in conjunction with the hand mold sleeve to form the inner and outer shaping of the mold. This results in the final injection-molded prosthetic limb sleeve having only two contact surfaces, both of which are complete curved surfaces. The hand mold sleeve has high elasticity, allowing it to be directly ejected from the inner mold of the prosthetic hand, forming a complete prosthetic limb sleeve. The entire sleeve has no parting line after molding. Because the sleeve molded by this device lacks a parting line, the step of polishing the parting line is eliminated, and there is no need for repair or recoloring of polished areas. This further avoids the problem of color fading after recoloring, making the entire sleeve more integrated. Attached Figure Description

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Figure 1 This is a schematic diagram of the overall external structure of one side of the back-of-hand mold shell of this utility model;

[0042] Figure 2 This is a schematic diagram of the overall external structure of one side of the palm mold shell after the inner mold of the prosthetic hand and the mold sleeve have been removed.

[0043] Figure 3 This is a side view of the external structure of the palm mold shell and the palm mold shell in the spliced ​​state of this utility model;

[0044] Figure 4 This is a schematic diagram of the internal structure of the hand back mold shell of this utility model;

[0045] Figure 5 This is a schematic diagram of the internal structure of the palm mold shell of this utility model;

[0046] Figure 6 This is a schematic diagram of the hand mold sleeve structure of this utility model;

[0047] Figure 7 This is a schematic diagram of the internal mold structure of the prosthetic hand of this utility model;

[0048] Figure 8 This is a schematic diagram of the port baffle structure of this utility model;

[0049] Figure 9 This is a schematic diagram of the final formed prosthetic hand leather sleeve structure of the utility model.

[0050] The attached diagram lists the components represented by each number as follows:

[0051] 1-Back of hand mold shell, 11-Matching block, 12-Locking hole, 13-Back of hand mold groove, 2-Palm mold shell, 21-Positioning slot, 22-Positioning nut, 23-Palm mold groove, 3-Hand mold sleeve, 31-Mold sleeve retaining ring, 32-Mold sleeve positioning block, 4-Port baffle, 41-Vent hole, 42-Glue injection hole, 43-Positioning hole, 5-Stop groove, 51-Embedded nut, 52-Positioning groove, 6-Dummy hand inner mold, 61-Dummy hand nut, 7-Dummy hand leather sleeve. Detailed Implementation

[0052] Please see Figures 1 to 9 As shown, this utility model provides a prosthesis manufacturing mold without parting lines. In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] In a specific embodiment of the technical solution of this utility model:

[0054] It includes a back of hand mold shell 1, a palm mold shell 2, a hand mold sleeve 3, an end baffle 4, and a prosthetic hand inner mold 6;

[0055] Both the back-of-hand mold shell 1 and the palm mold shell 2 are molds for prostheses; the back-of-hand mold shell 1 and the palm mold shell 2 can be separably assembled to form a complete prosthesis sleeve shell. The assembled sleeve shell of the back-of-hand mold shell 1 and the palm mold shell 2 is hollow internally, with an opening at the rear end; the splicing surfaces of the back-of-hand mold shell 1 and the palm mold shell 2 are flat and fit together, while the outer surfaces of the back-of-hand mold shell 1 and the palm mold shell 2 bulge outwards; the inner surface of the back-of-hand mold shell 1... The back of the hand mold 13 is recessed outward; the outer side of the back of the hand mold shell 1 is pushed outward by the back of the hand mold 13 to form an arm shape; the inner side of the palm mold shell 2 is recessed towards the palm side by the palm mold 23; the outer side of the palm mold shell 2 is pushed towards the palm side by the palm mold 23 to form a raised arc surface. The shape of the inner recess and the outer convex is the conventional shape of the mold; the back of the hand mold 13 and the palm mold 23 are closed to form a sealed cavity with an opening at the rear end;

[0056] The back of the hand mold groove 13 and the palm mold groove 23 are tightly fitted to the outside of the hand mold sleeve 3;

[0057] The back of the hand mold shell 1 is provided with multiple matching clips 11 and multiple locking holes 12;

[0058] Multiple mounting blocks 11 and multiple locking holes 12 are arranged around the edge of the back of the hand mold groove 13, and the mounting blocks 11 and locking holes 12 do not contact the back of the hand mold groove 13;

[0059] The palm mold shell 2 is provided with multiple positioning slots 21 and multiple positioning nuts 22;

[0060] Each positioning nut 22 is fitted into the splicing surface of the palm mold shell 2, and the positioning nut 22 is located inside the splicing surface of the palm mold shell 2;

[0061] Multiple positioning slots 21 and multiple positioning nuts 22 are arranged around the periphery of the palm mold groove 23, and each positioning slot 21 and each positioning nut 22 is connected to the palm mold groove 23.

[0062] Each positioning nut 22 on the back of the hand mold shell 1 and the palm mold shell 2 in the assembled state corresponds one-to-one with a locking hole 12.

[0063] This structure allows each positioning slot 21 to be matched and locked with a corresponding matching block 11 after the back of the hand mold shell 1 and the palm mold shell 2 are fitted together. At this time, the positioning nuts 22 are aligned with a locking hole 12. Then, bolts can be passed through the locking holes 12 and locked onto the positioning nuts 22. This ensures that the mating surfaces of the back of the hand mold shell 1 and the palm mold shell 2 are stably fitted together and cannot slide. The bolts also ensure that the two are fitted together and cannot be separated, thus ensuring the stability of the mold assembled from the back of the hand mold shell 1 and the palm mold shell 2.

[0064] The hand mold sleeve 3 is a complete, closed, flexible sleeve. The rear end of the hand mold sleeve 3 is open, and the back of the hand mold shell 1 and the palm mold shell 2 can be separably wrapped around the outside of the hand mold sleeve 3. The hand mold sleeve 3 serves as a mold for the external contour of the prosthesis. The inner cavity shape of the hand mold sleeve 3 is the same as the external shape of the prosthesis, and the inner wall shape of the hand mold sleeve 3 is consistent with the designed outer wall shape of the prosthesis. The inner wall shape of the hand mold sleeve 3 is basically consistent with the outer wall shape of the inner prosthesis mold 6. The outer shape of the inner prosthesis mold 6 is consistent with the external skeletal design shape of the prosthesis. Generally, the shape of the prosthesis does not consider the movement of the fingers or wrist joints; only the shape is considered. The length and thickness are based on the size of the patient's other arm. Customization is required, but the prosthetic hand mold sleeve 3 manufactured by this device has no parting line on the outer wall, and this mold can be reused. When the patient's hand mold sleeve 3 is used for a long time and color difference or aging occurs, it needs to be replaced with a new hand mold sleeve 3. It can be re-injected with silicone. Of course, the production of this device as a mold for general-purpose prostheses is more efficient. It does not require grinding the parting line, nor does it require redrawing the marks left by grinding. It can be mass-produced in one molding, with high efficiency and high integrity. The rear opening edge of the hand mold sleeve 3 is provided with an annular mold sleeve retaining ring 31. The plane of the mold sleeve retaining ring 31 is perpendicular to the plane of the rear opening of the hand mold sleeve 3.

[0065] The hand mold sleeve 3 is a one-piece sleeve structure molded from silicone. Mold positioning blocks 32 are also provided on the left and right sides of the outer wall of the hand mold sleeve 3. The thickness of the hand mold sleeve 3 is 10mm.

[0066] Positioning grooves 52 are also provided on the splicing surfaces of the back of hand mold shell 1 and the palm mold shell 2;

[0067] The positioning groove 52 is recessed downward and formed on the splicing surface of the back of the hand mold shell 1 and the palm mold shell 2. The splicing of the positioning groove 52 on the back of the hand mold shell 1 and the palm mold shell 2 is a square cavity; the mold sleeve positioning block 32 can be separably fitted into the cavity spliced ​​by the positioning groove 52.

[0068] The positioning block 32 and the positioning groove 52 are in clearance fit, with a gap not exceeding 1mm, so that the final prosthetic hand leather 7 maintains uniform thickness in all parts, and the thickness of the prosthetic hand leather 7 is 2.5mm.

[0069] Both the back-end openings of the back-end mold shell 1 and the palm mold shell 2 are recessed towards the front end and are provided with retaining grooves 5; the retaining grooves 5 at the rear ends of the back-end mold shell 1 and the palm mold shell 2 are spliced ​​together to form a complete annular groove, and the mold sleeve retaining ring 31 can be separably fitted into the retaining groove 5, and the outer side of the mold sleeve retaining ring 31 is flush with the outer end face of the retaining groove 5, and the rear end opening of the hand mold sleeve 3 is on the same plane as the rear end opening of the sleeve shell composed of the back-end mold shell 1 and the palm mold shell 2, so that the rear end openings of the back-end mold shell 1 and the palm mold shell 2 are also on the same plane after splicing, which is used to tightly splice with the port baffle 4;

[0070] The prosthetic hand inner mold 6 is a closed, rigid model. The shape of the prosthetic hand inner mold 6 is the same as that of the prosthesis. The prosthetic hand inner mold 6 can be separably inserted into the hand mold sleeve 3. The prosthetic hand inner mold 6 is a solid resin hand model. The rear end of the prosthetic hand inner mold 6 is flat, and multiple prosthetic hand nuts 61 are embedded in the rear end of the prosthetic hand inner mold 6. The prosthetic hand inner mold 6 needs to have a smooth surface and sufficient hardness.

[0071] The port baffle 4 is a flat plate structure. The port baffle 4 can be detachably covered at the rear opening of the hand mold sleeve 3, the back mold shell 1, and the palm mold shell 2. The port baffle 4 also has an exhaust hole 41 and an injection hole 42. The exhaust hole 41 and the injection hole 42 penetrate through both sides of the port baffle 4. The port baffle 4 is a transparent PVC flat plate, and the rear end faces of the back mold shell 1 and the palm mold shell 2 are within the coverage area of ​​the port baffle 4.

[0072] Multiple positioning holes 43 are also provided on the port baffle 4. The multiple positioning holes 43 are evenly distributed in two rings on the port baffle 4. The positioning holes 43 in the inner ring correspond one-to-one with the positions of multiple dummy hand nuts 61. There are two rings of positioning holes 43. The positioning holes 43 in the inner ring are within the coverage area of ​​the dummy hand inner mold 6, while the positioning holes 43 in the outer ring are within the corresponding range of the rear end of the back mold shell 1 and the palm mold shell 2.

[0073] Multiple pre-embedded nuts 51 are embedded at the rear ends of both the back-of-hand mold shell 1 and the palm mold shell 2. The pre-embedded nuts 51 are located inside the back-of-hand mold shell 1 and the palm mold shell 2, and the rear end faces of the back-of-hand mold shell 1 and the palm mold shell 2 are flat. The hand mold sleeve 3, which is filled with the artificial hand inner mold 6, is sealed inside the mold cavity formed by the back-of-hand mold shell 1 and the palm mold shell 2 through the port baffle 4. This forms an integral force-bearing structure, and then silicone can be easily injected into the gap between the hand mold sleeve 3 and the artificial hand inner mold 6. Finally, the solidified shape is the same as the inner wall of the hand mold sleeve 3 on the outside, and the inner wall is the same as the outer wall of the artificial hand inner mold 6.

[0074] The positioning holes 43 on the outer ring correspond one-to-one with the positions of the pre-embedded nuts 51 opened at the rear ends of the back mold shell 1 and the palm mold shell 2. The rear ends of the back mold shell 1, the palm mold shell 2 and the hand mold sleeve 3 are all sealed and locked with the port baffle 4 by bolts. The bolts pass through the positioning holes 43 and are locked in the pre-embedded nuts 51 and the dummy hand nuts 61. This structure can limit and lock the positions of the back mold shell 1, the palm mold shell 2 and the dummy hand inner mold 6, which makes it easy to inject liquid silicone from the injection hole 42 later. The injected silicone sinks to the bottom and the air in the hand mold sleeve 3 is discharged through the vent hole 41, so that the final molded dummy hand sleeve 7 remains intact.

[0075] It should be noted that:

[0076] 1. When making a prosthetic limb sleeve, space needs to be reserved for the prosthetic skeleton. Therefore, when the sleeve is injection molded, the inner mold 6 of the prosthetic hand needs to be placed inside the hand mold sleeve 3 to fill the space of the prosthetic skeleton. The shape of the inner mold 6 of the prosthetic hand is basically the shape of the prosthetic skeleton. Because the final injection molded prosthetic limb sleeve has a certain elasticity, the shapes of the inner mold 6 of the prosthetic hand and the hand mold sleeve 3 can deviate slightly. This error generally needs to be controlled within 2mm to ensure that the elasticity of the silicone can accommodate the error of the mold.

[0077] 2. Due to the large size of the hand and the cotter pin in the forearm cross-section, the current molds for prosthetic limbs can only use a semi-open mold structure. The same applies to prosthetic foot sleeves; the foot size is larger than the cross-sectional diameter of the lower leg, so a semi-open mold is also necessary. However, a semi-open mold inevitably creates parting lines after injection molding, which are very difficult to clean and require subsequent color touch-ups, resulting in color differences and easy fading. This device adds a hand mold sleeve 3, changing the original method of directly placing the inner mold after assembling the outer mold before injection molding. With the addition of the hand mold sleeve 3, the prosthetic limb sleeve is ultimately injection molded within the hand mold sleeve 3, which is a complete sleeve, and the inner mold 6 of the prosthetic hand is also... The device is a complete, integrated unit. The inner mold 6 and the sleeve 3 of the prosthetic hand can be smoothly polished during production. The sleeve 3 is made of high-density silicone, eliminating the need for internal injection of air bubbles or other structures. This device uses the more conveniently manufactured sleeve 3 and inner mold 6 as the molding mold for the prosthetic hand cover 7, forming a complete sleeve with an integrated structure. There are no parting lines, and no post-processing polishing is required. This simplifies the process and results in a more realistic appearance for the final prosthetic hand cover 7. The gap at the parting point is at the junction of the back of the hand mold shell 1 and the palm mold shell 2, while there is no significant gap at the injection molding seam between the sleeve 3 and the inner mold 6. This eliminates parting lines, resulting in a smooth appearance that requires no polishing, filling, or color correction. The integrated cover has uniform and stable coloring.

[0078] When using this utility model, first take the hand mold sleeve 3 and the artificial hand inner mold 6, and evenly apply a release agent such as a release agent to the outside of the artificial hand inner mold 6; then pull the opening at the rear end of the hand mold sleeve 3 to enlarge it, and put the artificial hand inner mold 6 into the hand mold sleeve 3; then clamp the outside of the hand mold sleeve 3 containing the artificial hand inner mold 6 between the back of the hand mold shell 1 and the palm mold shell 2.

[0079] When clamping the back of the hand mold shell 1 and the palm mold shell 2, the positions of the mounting block 11 and the positioning slot 21 are aligned one by one, and the positions of the positioning nut 22 and the locking hole 12 are aligned one by one. Finally, the back of the hand mold shell 1 and the palm mold shell 2 are locked together with the nut.

[0080] When assembling the back of the hand mold shell 1 and the palm mold shell 2, the mold sleeve retaining ring 31 is snapped into the retaining groove 5, and the upper and lower sides of the mold sleeve positioning block 32 are snapped into the positioning grooves 52 of the back of the hand mold shell 1 and the palm mold shell 2.

[0081] Ensure that the hand mold sleeve 3 is neatly inserted into the back of the hand mold shell 1 and the palm mold shell 2, then install the port baffle 4, align the positioning hole 43 of the outer ring with the pre-embedded nuts of the back of the hand mold shell 1 and the palm mold shell 2, and tighten it with screws. Also align the positioning hole 43 of the inner ring with the dummy hand nut 61, and tighten it into one piece with bolts.

[0082] After aligning and assembling the back-of-hand mold shell 1, palm mold shell 2, hand mold sleeve 3, artificial hand inner mold 6, and port baffle 6 into a whole, place the whole structure vertically with the port baffle 4 facing upwards. Finally, inject liquid silicone material into the injection hole 42 until silicone overflows from the vent hole 41 to complete the injection molding operation. After the silicone in the mold cools and solidifies, remove the port baffle 4, then separate the back-of-hand mold shell 1 and palm mold shell 2. Finally, open the hand mold sleeve 3 and pull out the artificial hand inner mold 6 from inside. The resulting leather sleeve is the artificial hand leather sleeve 7, which is a complete artificial hand leather sleeve 7 without parting lines. This device can also mass-produce artificial hand molds. Similarly, this device is also suitable for artificial foot molds, only the shape is slightly different.

[0083] This device can design molds of various sizes, which users can choose according to their needs, similar to choosing shoe sizes. Custom production is also possible; that is, when making the mold, the patient's other arm needs to be scanned and mirrored to obtain the shape of the stump. The final prosthetic hand 77 also lacks parting lines; however, this device is used for standardized mass production, resulting in higher production efficiency and allowing its advantages to be more effectively utilized.

[0084] The front end of this device refers to one end of the finger, and the rear end refers to the splicing point of the arm stump. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0085] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A mold for manufacturing a prosthesis without parting lines, characterized in that, include: Back of hand mold shell (1), palm mold shell (2), hand mold sleeve (3), port baffle (4) and artificial hand inner mold (6); The back of the hand mold (1) and the palm mold (2) are both molds for prostheses; the back of the hand mold (1) and the palm mold (2) can be separated and assembled into a sleeve shell of a complete prosthesis; the sleeve shell assembled from the back of the hand mold (1) and the palm mold (2) is hollow inside; the sleeve shell assembled from the back of the hand mold (1) and the palm mold (2) has an opening at the rear end. The hand mold sleeve (3) is a complete closed flexible sleeve. The hand mold sleeve (3) has an opening at the rear end. The back mold shell (1) and the palm mold shell (2) can be separably wrapped around the outside of the hand mold sleeve (3). The hand mold sleeve (3) is a mold of the outer contour of the prosthesis. An annular mold retaining ring (31) is provided on the edge of the rear opening of the hand mold sleeve (3). The plane of the mold retaining ring (31) is perpendicular to the plane of the rear opening of the hand mold sleeve (3). The back-end openings of the back-hand mold shell (1) and the palm mold shell (2) are recessed towards the front end and are provided with retaining grooves (5); the retaining grooves (5) at the rear ends of the back-hand mold shell (1) and the palm mold shell (2) are spliced ​​into a complete annular groove, the mold sleeve retaining ring (31) can be separably fitted into the retaining groove (5), and the outer side of the mold sleeve retaining ring (31) is flush with the outer end face of the retaining groove (5), and the rear end opening of the hand mold sleeve (3) is on the same plane as the rear end opening of the sleeve shell composed of the back-hand mold shell (1) and the palm mold shell (2); The inner mold of the prosthetic hand (6) is a closed rigid model. The shape of the inner mold of the prosthetic hand (6) is the same as that of the prosthesis. The inner mold of the prosthetic hand (6) can be separably inserted into the inside of the hand mold sleeve (3). The port baffle (4) is a flat plate structure. The port baffle (4) can be detachably covered at the rear opening of the hand mold sleeve (3), the back of the hand mold shell (1) and the palm mold shell (2). The port baffle (4) also has an exhaust hole (41) and an injection hole (42). The exhaust hole (41) and the injection hole (42) penetrate both sides of the port baffle (4). The rear ends of the back of the hand mold shell (1), the palm mold shell (2) and the hand mold sleeve (3) are all sealed and locked with the port baffle (4) by bolts.

2. The mold for manufacturing a prosthesis without parting lines according to claim 1, characterized in that: The splicing surfaces of the back of the hand mold shell (1) and the palm mold shell (2) are flat and fit together. The outer surfaces of the back of the hand mold shell (1) and the palm mold shell (2) protrude outward. The inner surface of the back of the hand mold shell (1) is a back of the hand mold groove (13) that is recessed outward. The inner surface of the palm mold shell (2) is a palm mold groove (23) that is recessed towards the palm side. The back of the hand mold groove (13) and the palm mold groove (23) cover each other to form a sealed cavity with an opening at the rear end. The back of hand mold groove (13) and the palm mold groove (23) are tightly fitted to the outside of the hand mold sleeve (3); The back of the hand mold shell (1) is provided with multiple mounting blocks (11) and multiple locking holes (12). Multiple mounting blocks (11) and multiple locking holes (12) are arranged around the edge of the back mold groove (13), and the mounting blocks (11) and locking holes (12) do not contact the back mold groove (13); The palm mold shell (2) is provided with multiple positioning slots (21) and multiple positioning nuts (22). Each of the positioning nuts (22) is fitted into the splicing surface of the palm mold shell (2), and the positioning nuts (22) are located inside the splicing surface of the palm mold shell (2); Multiple positioning slots (21) and multiple positioning nuts (22) are arranged around the periphery of the palm mold groove (23), and each positioning slot (21) and each positioning nut (22) is connected to the palm mold groove (23). Each of the positioning nuts (22) on the back of the hand mold shell (1) and the palm mold shell (2) in the assembled state corresponds one-to-one with a locking hole (12).

3. The mold for manufacturing a prosthesis without parting lines according to claim 1, characterized in that: The hand mold sleeve (3) is an integral sleeve structure molded from silicone. The left and right sides of the outer wall of the hand mold sleeve (3) are also provided with mold positioning blocks (32). Positioning grooves (52) are also provided on the splicing surfaces of the back of hand mold shell (1) and the palm mold shell (2). The positioning groove (52) is recessed downward on the splicing surface of the back mold shell (1) and the palm mold shell (2), and the splicing of the positioning groove (52) on the back mold shell (1) and the palm mold shell (2) is a square cavity; the mold positioning block (32) can be separably fitted into the cavity spliced ​​by the positioning groove (52); The positioning block (32) and the positioning groove (52) are in clearance fit, with a clearance not exceeding 1mm.

4. The mold for manufacturing a prosthesis without parting lines according to claim 3, characterized in that: The artificial hand mold (6) is a solid resin hand model; The rear end of the artificial hand inner mold (6) is a plane, and multiple artificial hand nuts (61) are embedded in the rear end of the artificial hand inner mold (6).

5. A mold for manufacturing a prosthesis without parting lines according to claim 4, characterized in that: The port baffle (4) is a transparent PVC plate, and the rear end faces of the back of the hand mold shell (1) and the palm mold shell (2) are within the coverage area of ​​the port baffle (4). The port baffle (4) is also provided with a plurality of positioning holes (43), which are evenly distributed in two rings on the port baffle (4). The positioning holes (43) in the inner ring correspond one-to-one with the positions of the plurality of dummy nuts (61). Multiple pre-embedded nuts (51) are embedded at the rear ends of both the back of the hand mold shell (1) and the palm mold shell (2). The positioning holes (43) on the outer ring correspond one-to-one with the positions of the pre-embedded nuts (51) opened at the rear ends of the back mold shell (1) and the palm mold shell (2).

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