Buffer layer structure of artificial limb socket
By employing a combination of a mesh inner layer and multiple negative Poisson's ratio support layers in the prosthesis socket, the problems of easy prosthesis slippage and poor breathability are solved, achieving stable connection and comfortable use.
Patent Information
- Application Number
- CN202422495419.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-10-15
AI Technical Summary
Existing prosthetic sockets are prone to accidental dislodgement when subjected to forces that are directed away from the user's residual limb, and they also have poor breathability, affecting user comfort and health.
The structure employs a combination of a mesh inner layer, a first negative Poisson's ratio support layer, a mesh interlayer, and a second negative Poisson's ratio support layer. By utilizing the negative Poisson's ratio characteristic, the structure exhibits different mechanical properties under stress in different directions, ensuring smooth insertion of the residual limb and preventing it from falling off.
It improves the connection stability between the prosthesis and the residual limb, enhances breathability, improves user comfort, and reduces the chance of accidental dislodgement.
Smart Images
Figure CN223668125U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of artificial limbs, and more particularly to a buffer layer structure of an artificial limb socket. BACKGROUND
[0002] Generally, an artificial limb includes a shell and a flexible liner arranged inside, the flexible liner surrounds to form a socket, the socket is used to be set on the residual limb of a user, so that the artificial limb is connected with the residual limb of the user. Full contact and sorption type design is the mainstream direction of the artificial limb industry. The socket refers to the part in direct contact with the user's residual limb, and its design aims to provide support, stability and comfort or aesthetics, and it is the connecting part between the residual limb and the artificial limb, which has the functions of bearing body weight and suspending the artificial limb. The contact between the residual limb and the artificial limb is as comfortable as possible. The force of the relevant residual limb can be effectively transmitted to the distal part of the artificial limb. Some artificial limb sockets use flexible full contact sockets, such as silicone socket cavities, to establish a buffer for the pressure of the residual limb skin. However, due to the limited air permeability of silicone, it affects the comfort of use.
[0003] However, the existing flexible full contact socket is generally beneficial to the insertion of the residual limb of the user, but when the artificial limb is subjected to a force in a direction away from the residual limb of the user, the artificial limb is also prone to fall off the residual limb, thereby causing the existing artificial limb to be prone to accidental falling off during use.
[0004] Therefore, the prior art still needs to be improved and developed. CONTENT OF THE UTILITY MODEL
[0005] The present application aims to provide a buffer layer structure of an artificial limb socket, which solves the problem that the existing artificial limb often slips and is prone to accidental falling off when subjected to a force in a direction away from the residual limb of the user.
[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:
[0007] The present application provides a buffer layer structure of an artificial limb socket, which comprises: a net structure inner layer, the net structure inner layer is arranged around and used to connect a flexible liner to form a receiving cavity, the receiving cavity is used to connect the residual limb of a user;
[0008] At least one first negative Poisson's ratio support layer is connected to the outer side of the net structure;
[0009] At least one net structure interlayer is arranged around the outer side of the first negative Poisson's ratio support layer;
[0010] At least one second negative Poisson's ratio support layer is arranged on the outer side of the net structure interlayer, and the outer side of the second negative Poisson's ratio support layer is used to connect a shell;
[0011] The first and second negative Poisson's ratio support layers expand towards the inner side of the inner cavity when the user's residual limb is pulled away from the receiving cavity.
[0012] Optionally, the first negative Poisson's ratio support layer comprises a plurality of first support portions arranged around the outer wall of the inner mesh layer;
[0013] One end of each first support portion is connected to the inner mesh layer and the other end is connected to the inter-mesh layer;
[0014] In the longitudinal section of the receiving cavity, the height of the first support portion near the inner mesh layer is lower than the height of the first support portion near the inter-mesh layer.
[0015] Optionally, the first support portion comprises a first support column, one end of which is connected to the inner mesh layer and the other end is connected to the inter-mesh layer.
[0016] Optionally, the first support portion further comprises a second support column, one end of which is connected to the inner mesh layer and the other end is connected to the inter-mesh layer;
[0017] In the transverse section of the receiving cavity, the second support column and the first support column are both arranged obliquely, and one end of the second support column is connected to one end of the first support column.
[0018] Optionally, the second negative Poisson's ratio support layer comprises a plurality of second support portions, one end of each second support portion is connected to the inter-mesh layer and the other end is connected to the outer shell;
[0019] In the longitudinal section of the receiving cavity, the height of the second support portion near the inter-mesh layer is lower than the height of the second support portion near the outer shell.
[0020] Optionally, in the longitudinal section of the receiving cavity, the first support portion and the second support portion are arranged alternately.
[0021] Optionally, the inner mesh layer and the inter-mesh layer each comprise a plurality of first spiral support strips arranged around the receiving cavity and a plurality of second spiral support strips arranged around the receiving cavity, the spiral direction of the first spiral support strips is opposite to the spiral direction of the second spiral support strips, and the first spiral support strips and the second spiral support strips are arranged alternately to form a plurality of intersection nodes and a plurality of rhombic holes;
[0022] One end of the first negative Poisson's ratio support layer is connected to the intersection node of the inner mesh layer and the other end is connected to the intersection node of the inter-mesh layer;
[0023] One end of the second negative Poisson's ratio support layer is connected to the intersection node of the inter-mesh layer and the other end is connected to the outer shell.
[0024] Optionally, a connecting rim is arranged at the opening of the receiving cavity, and the connecting rim connects the inner layer of the mesh structure, the interlayer of the mesh structure, and the shell.
[0025] The upper ends of the first plurality of spiral support strips and the upper ends of the second plurality of spiral support strips are connected by a connecting rim.
[0026] Optionally, the lower ends of the first plurality of spiral support strips and the lower ends of the second plurality of spiral support strips are both converging towards the central axis of the receiving cavity and connected.
[0027] The prosthetic socket cushioning layer structure provided by the present application has at least the following beneficial effects: the inner layer of the mesh structure connects the flexible inner liner to form the receiving cavity, so that the user's residual limb can be inserted into the receiving cavity to connect the prosthesis; the first negative Poisson's ratio support layer, the interlayer of the mesh structure, and the second negative Poisson's ratio support layer realize the connection of the shell and the negative Poisson's ratio characteristic. The negative Poisson's ratio characteristic of the cushioning layer structure makes the flexible inner liner exhibit different mechanical properties when subjected to stress in different directions. When the residual limb is inserted into the receiving cavity, the flexible inner liner is subjected to downward and outward extrusion force, and the first negative Poisson's ratio support layer and the second negative Poisson's ratio support layer make the flexible inner liner in a relaxed and open state, thereby facilitating the smooth insertion of the residual limb into the receiving cavity; when the prosthetic socket is pulled away from the residual limb, the flexible inner liner is subjected to upward throwing force, and the cushioning layer structure with negative Poisson's ratio characteristic expands inward, thereby driving the flexible inner liner to contract. The contracted flexible inner liner makes the receiving cavity smaller and tighter, thereby preventing the residual limb from being easily pulled out of the receiving cavity and reducing or preventing the accidental loosening of the prosthesis during use. Moreover, when the prosthetic socket with the cushioning layer structure is used normally, the first negative Poisson's ratio support layer and the second negative Poisson's ratio support layer make the flexible inner liner in a relatively relaxed state during the downward extrusion of the residual limb on the cushioning layer structure, so that the pressure applied to the residual limb in the relaxed state is relatively small, thereby improving the comfort of the user. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0029] Figure 1 A structure diagram of the cushioning layer structure of the prosthetic socket in a use state is provided for the embodiments of the present application.
[0030] Figure 2 A cross-sectional view of the cushioning layer structure of the prosthetic socket is provided for the embodiments of the present application.
[0031] Figure 3 A structure diagram of a flexible inner liner and a mesh structure inner layer of a cushion layer structure of a prosthetic socket according to an embodiment of the present application;
[0032] Figure 4 A structure diagram of a first negative Poisson's ratio support layer in a cushion layer structure of a prosthetic socket according to an embodiment of the present application;
[0033] Figure 5 A structure diagram of a mesh structure interlayer in a cushion layer structure of a prosthetic socket according to an embodiment of the present application;
[0034] Figure 6 A structure diagram of a second negative Poisson's ratio support layer in a cushion layer structure of a prosthetic socket according to an embodiment of the present application;
[0035] Figure 7 A structure diagram of an outer shell in a cushion layer structure of a prosthetic socket according to an embodiment of the present application;
[0036] Figure 8 A principle diagram of a negative Poisson's ratio effect according to an embodiment of the present application.
[0037] In the drawings, various elements are labeled with reference numerals, and the following is a list of the reference numerals and the corresponding elements:
[0038] 10, residual limb; 100, flexible inner liner; 110, receiving cavity; 120, air-permeable hole; 200, mesh structure inner layer; 210, first spiral support strip; 220, second spiral support strip; 221, intersection node; 230, diamond hole; 240, connecting edge portion; 300, first negative Poisson's ratio support layer; 310, first support portion; 311, first support column; 312, second support column; 400, mesh structure interlayer; 500, second negative Poisson's ratio support layer; 510, second support portion; 600, outer shell; 610, connector. DETAILED DESCRIPTION
[0039] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.
[0040] It should be noted that when a component is referred to as being "fixed" or "set up" on another component, it can be directly or indirectly on the other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or position shown in the drawings, and are only for the convenience of description, and cannot be understood as a limitation on the technical solutions. The terms "first", "second" are only for the convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0041] The existing artificial limb not only has the problem of accidental falling when subjected to a force deviating from the direction of the user's residual limb, but also has the problem of poor air permeability, affecting perspiration, leading to discomfort of the related skin and increasing the risk of inflammation caused by skin infection bacteria due to the use of a flexible full-contact receiving cavity. Furthermore, the wearing site is subjected to pressure for a long time due to the design of the adsorption type, which also affects blood supply and the health of related soft tissues, etc. Therefore, to solve the above problems, the following embodiments are proposed in the present application:
[0042] As Figure 1 , Figure 2As shown, the embodiment proposes a buffer layer structure of a prosthetic socket, which is used to connect a flexible inner liner 100 on the inner side and a rigid outer shell 600 on the outer side, so as to form a prosthetic socket. For the convenience of structure description, the structure is described by taking the example of the prosthetic socket being vertically arranged, so the opening of the prosthetic socket is upward. The buffer layer structure of the prosthetic socket of the embodiment mainly comprises: a net structure inner layer 200, a first negative Poisson's ratio support layer 300, a net structure interlayer 400 and a second negative Poisson's ratio support layer 500 arranged in sequence from the inner layer to the outer layer. The net structure inner layer 200 is arranged around to form an upwardly open inner cavity, and the flexible inner liner 100 is connected in the inner cavity to form a receiving cavity 110 for connecting the residual limb 10 of the user. The inner surface of the open end of the flexible inner liner 100 is inwardly reduced by a predetermined thickness based on the surface of the residual limb 10, and the predetermined thickness can be 1-3 mm, so that the caliber of the open end of the flexible inner liner 100 is smaller than the outer diameter of the residual limb 10, so that when it is worn, the receiving cavity 110 exerts a small pressure on the residual limb, improving the connection. The first negative Poisson's ratio support layer 300 is connected on the outer side of the net structure, and the net structure interlayer 400 is arranged around the outer side of the first negative Poisson's ratio support layer 300; so that under the support of the net structure interlayer 400, the first negative Poisson's ratio support layer 300 has the negative Poisson's ratio characteristic. The second negative Poisson's ratio support layer 500 is arranged on the outer side of the net structure interlayer 400, and the outer side of the second negative Poisson's ratio support layer 500 is used to connect the outer shell 600; the outer shell 600 has high hardness and large structural strength, so under the support of the outer shell 600, the second negative Poisson's ratio support layer 500 has the negative Poisson's ratio characteristic. By adopting the structure of the net structure inner layer 200 and the net structure interlayer 400, not only the support of the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 is provided, but also the weight of the prosthesis is reduced, the flexible inner liner 100 is ventilated, the comfort of the user is improved, the production cost is reduced, and the economic burden of the patient and the society is reduced. Under the negative Poisson's ratio characteristic, when the user's residual limb is pulled away from the receiving cavity 110, the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 are both inflated toward the inner side of the inner cavity, so as to squeeze the flexible inner liner 100 to shrink, so that the shrunk receiving cavity 110 is tightly fitted on the residual limb.
[0043] It is easy to think that in the buffer layer structure of the prosthetic socket of the present application, only the first negative Poisson's ratio support layer can be arranged, so as to be used for a thinner prosthetic socket structure. In addition, a plurality of layers of the first negative Poisson's ratio support layer and the net structure interlayer can be arranged in sequence from the inner to the outer, and then one or more layers of the second negative Poisson's ratio support layer are arranged on the outer side, so as to realize the multi-layered nesting, which is used for a thicker prosthetic socket structure. The multi-layer structure can also solve the technical problems.
[0044] As Figure 1 , Figure 2 , Figure 3As shown, the present application provides a kind of prosthetic socket buffer layer structure, which is connected with flexible inner liner 100 by reticular structure inner layer 200 to form receiving cavity 110, so that the residual limb of user can be inserted into receiving cavity 110 to connect the prosthesis, and the reticular structure inner layer 200 is more conducive to shrinkage deformation due to the distribution of mesh holes; the first negative Poisson's ratio support layer 300, the reticular structure interlayer 400 and the second negative Poisson's ratio support layer 500 are used to realize the connection of the shell 600 and the negative Poisson's ratio characteristic. The negative Poisson's ratio characteristic of the buffer layer structure makes the flexible inner liner 100 exhibit different mechanical properties when subjected to stress in different directions. When the residual limb is inserted into the receiving cavity 110, the flexible inner liner 100 is subjected to downward and outward extrusion force, and the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 make the flexible inner liner 100 in relaxed open form, so as to facilitate the smooth insertion of the residual limb into the receiving cavity 110; when the prosthetic socket is pulled away from the residual limb, the flexible inner liner 100 is subjected to upward throwing force, and the buffer layer structure with negative Poisson's ratio characteristic expands inward, so as to drive the flexible inner liner 100 to shrink, and the shrunk flexible inner liner 100 makes the receiving cavity smaller and tighter, so that the residual limb is not easy to come out of the receiving cavity, and the accidental loosening of the prosthesis during use can be reduced or prevented. Moreover, when the prosthetic socket with the buffer layer structure is worn in daily life, the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 make the flexible inner liner 100 in a relatively relaxed form during the extrusion of the buffer layer structure by the residual limb, so that the pressure applied to the residual limb is relatively small when the user rests, thereby improving the comfort of the user. Moreover, in the process of the buffer layer structure with negative Poisson's ratio characteristic expanding inward, the reticular structure interlayer 400 and the reticular structure inner layer 200 are more easily deformed due to the distribution of mesh holes, so that the extrusion process of the flexible inner liner 100 is more obvious, so that the flexible inner liner 100 is more sensitive to shrinkage, thereby facilitating the tightening of the residual limb and reducing or preventing the accidental loosening of the prosthesis during use. Moreover, in the process of walking, the reticular structure interlayer 400 and the reticular structure inner layer 200 are more easily deformed due to their more easily deformed nature, so that the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 are more easily deformed to give way when subjected to the extrusion force of the residual limb, thereby reducing the peak pressure applied to the residual limb in daily life and improving the comfort of the user. The reticular structure interlayer 400 and the reticular structure inner layer 200 and the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 distributed therebetween can improve the air permeability, keep the residual limb dry and ventilated, and reduce the skin problems of the corresponding parts.
[0045] As Figure 1 、 Figure 2 、 Figure 4As shown, further, the first negative Poisson's ratio support layer 300 of the embodiment specifically comprises: a plurality of first support portions 310, which are arranged on the outer wall of the net structure inner layer 200 and can be uniformly distributed along the circumferential direction of the circumference. One end of each first support portion 310 is connected to the net structure inner layer 200, and the other end is connected to the net structure interlayer 400. The first support portions 310 uniformly distributed in the circumferential direction can make the stress in each direction of the circumference uniform when stressed, and make the consistency of the entire net structure inner layer 200 in each direction when shrinking or relaxing good.
[0046] The receiving cavity 110 surrounded by the buffer layer structure is divided into an upper part and a bottom part. In the state where the prosthetic receiving cavity is not used, the first support portions 310 arranged obliquely have a slope that becomes smaller and smaller from the upper part to the bottom part. In the structure, on the position corresponding to the side surface of the receiving cavity 110 on the longitudinal section of the receiving cavity 110 (i.e., the side surface of the upper part), the height of the first support portion 310 near the one end of the net structure inner layer 200 in the upper region of the receiving cavity 110 is lower than the height of the first support portion 310 near the one end of the net structure interlayer 400. Along the direction from the upper part to the bottom part, the slope becomes smaller and smaller, so the height difference between the one end of the first support portion 310 near the net structure interlayer 400 and the one end of the first support portion 310 near the net structure inner layer 200 becomes smaller and smaller. The first support portion 310 at the joint of the upper part and the bottom part is even horizontal. In the bottom region of the receiving cavity 110, the height of the first support portion 310 near the one end of the net structure inner layer 200 is higher than the height of the first support portion 310 near the one end of the net structure interlayer 400.
[0047] In this way, when the prosthetic receiving cavity pulls away from the residual limb, the first support portions 310 in the upper region deform from bottom to top to drive the net structure inner layer 200 to shrink towards the inside, the first support portions 310 in the bottom region also deform from bottom to top to make the flexible inner liner 100 shrink, and the deformation of the net structure inner layer 200 at the bottom also facilitates the deformation of the side surface, so that the net structure inner layer 200 deforms as a whole to make the receiving cavity smaller and tighter on the residual limb, so that the residual limb is not easy to come out of the receiving cavity.
[0048] Principle introduction to the realization of negative Poisson's ratio characteristics:
[0049] In the positive Poisson's ratio characteristics, the material or structure will deform when subjected to tensile or compressive force. Under normal circumstances, the cross-sectional area perpendicular to the tensile direction will shrink; conversely, the cross-sectional area will increase when subjected to pressure. This is the common positive Poisson's ratio characteristics.
[0050] As Figure 1 , Figure 2 , Figure 8As shown, the original explanation is carried out by a layer of negative Poisson's ratio structure, which can be simply understood as two parts of shell and lining. A represents the shell, which is a fixed part (equivalent to the shell 600 in the present scheme), and B is the lining (equivalent to the flexible lining 100 in the present scheme) and contacts the residual limb. The shell and the lining are connected by an inclined columnar support structure (relative to the first negative Poisson's ratio support layer 300, the net structure interlayer 400 and the second negative Poisson's ratio support layer 500 in the present application), in which the three columnar support structures are P1, P2 and P3 respectively. When the residual limb tends to separate from the receiving cavity, the lining B of the receiving cavity is pulled outwards to establish the tension T in the direction of the figure. Due to the influence of the tension T, the inclined columnar support structures P1, P2 and P3 will rotate approximately along their fixed ends (point o in the figure), and their movable ends will move from the original position i to the contraction position i'. This action causes the columnar support structures P1, P2 and P3 to tend to be horizontal, and the horizontal columnar support structures P1, P2 and P3 can extrude the lining B of the receiving cavity, so as to compress the lining B inward, thereby extruding the residual limb wrapped by the lining B, increasing the friction between the surface of the residual limb and the lining, and reducing the accidental falling of the artificial limb.
[0051] Therefore, the buffer layer structure of the artificial limb receiving cavity proposed in the present application can thicken the wall thickness of the receiving cavity when the net structure inner layer is stretched towards the opening, and thin the wall thickness of the receiving cavity when the net structure inner layer is pushed inward. Thus, the negative Poisson's ratio structure characteristic is realized.
[0052] As shown in Figure 2 , Figure 4 Further, the first support part 310 can include a first support column 311, one end of which is connected to the net structure inner layer 200 and the other end of which is connected to the net structure interlayer 400. If only the first support column 311 is used to form the first support part 310, the first support column 311 is inclinedly arranged, and the height of the end close to the net structure inner layer 200 is lower than the height of the end close to the net structure interlayer 400 of the first support part 310, so as to realize the negative Poisson's ratio characteristic of the present scheme.
[0053] Preferably, the first support part 310 of the embodiment includes the first support column 311 and the second support column 312, one end of the second support column 312 is connected to the inner layer 200 of the mesh structure, and the other end is connected to the middle layer 400 of the mesh structure. In the cross section of the receiving cavity 110, the second support column 312 and the first support column 311 are both arranged obliquely, and one end of the second support column 312 is connected to one end of the first support column 311. In the specific structure, the second support column 312 is connected to the first support column 311 to form a V-shaped structure, which supports the inner and outer layers in the radial direction, so that the first support column 311 and the second support column 312 are inclined to support on both sides of the radial diameter, which can improve the support stability of the flexible inner liner 100 and keep the central axis of the flexible inner liner 100 stable. In this way, when subjected to a rotating force, the rotation of the inner liner and the outer shell 600 under stress is reduced, so that the flexible inner liner 100 and the outer shell 600 are not easy to change the angle.
[0054] As shown in Figure 2 , Figure 6 Further, the second negative Poisson's ratio support layer 500 of the embodiment specifically includes: a plurality of second support parts 510, one end of each second support part 510 is connected to the middle layer 400 of the mesh structure, and the other end is used to connect the outer shell 600; in the longitudinal cross section of the receiving cavity 110, the height of the second support part 510 near the one end of the middle layer 400 of the mesh structure is lower than the height of the second support part 510 near the one end of the outer shell 600. Therefore, the structure of the second negative Poisson's ratio support layer 500 is similar to that of the first Poisson's ratio support layer, and its function and role are the same as those of the first negative Poisson's ratio support layer 300.
[0055] In the specific structure, the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 are in the form of a star-shaped structure composed of inclined first support columns 311 and second support columns 312 in the downward view of the top (opening part) of the receiving cavity 110. In the first negative Poisson's ratio support layer 300, the two ends of the first support column 311 and the second support column 312 are connected to the inner layer and the middle layer grid respectively, and in the second negative Poisson's ratio support layer 500, the two ends of the first support column and the second support column are connected to the middle layer and the outer layer grid. This can strengthen the stability of the structure, reduce the rotation between the residual limb and the prosthetic receiving cavity, and ensure the connection stability.
[0056] In the side view of the receiving cavity 110, the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 are some inclined first support columns 311 and second support columns 312, and the first support column 311 and the second support column 312 are both lower near the central axis and higher on the outer side, so that when the inner layer of the mesh structure is stretched towards the opening of the receiving cavity, the inner layer of the mesh structure can be squeezed inward.
[0057] Furthermore, by employing a second negative Poisson's ratio support layer 500 in conjunction with the first negative Poisson's ratio support layer 300 to achieve multi-stage gradual deformation, the originally radially longer support portion is transformed into a structure consisting of the second negative Poisson's ratio support layer 500, a mesh structure interlayer 400, and the first negative Poisson's ratio support layer 300. This improves support stability. In particular, the mesh structure interlayer 400 provides intermediate support for the first negative Poisson's ratio support layer 300, allowing it to respond more quickly and deform rapidly. Moreover, the compressive force generated by its deformation is greater, resulting in the flexible inner liner 100 fitting the residual limb more tightly after shrinkage. Therefore, it can effectively reduce or prevent accidental loosening of the prosthesis during use. The radial length of the second support portion in the second negative Poisson's ratio support layer 500 and the first support portion in the first negative Poisson's ratio support layer 300 can be the same, achieving a uniform distribution between the inner and outer layers.
[0058] In other designs, the second support portion 510 is longer than the first support portion 310 in the radial direction. This allows the longer, inclined second support portion 510 to quickly respond to changes in tension as the residual limb tends to detach from the receiving cavity. The movable end of the longer second support portion 510 can move more quickly from its original position to its retracted position. Simultaneously, the shorter first support portion 310 also retracts. Because the first support portion 310 is shorter and has higher structural strength, it provides more stable support. When the shorter first support portion 310 moves to a near-horizontal position, it provides greater compressive force to the inner mesh layer 200. This rapid response also allows for better retraction of the flexible liner 100, thus more effectively reducing the risk of accidental prosthesis dislodgement.
[0059] like Figure 2 , Figure 4 , Figure 6 As shown, furthermore, in the longitudinal section of the receiving cavity 110, the first support portion 310 and the second support portion 510 are arranged alternately. By alternating the V-shaped structures of the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500, the axial stability of the flexible liner 100 is further improved, thereby enhancing the support stability of the flexible liner 100 and keeping the central axis of the flexible liner 100 stable.
[0060] The distribution density of the V-shaped structures in the second negative Poisson's ratio support layer 500 can be the same as or different from that of the V-shaped structures in the first negative Poisson's ratio support layer 300. For example, in some embodiments, the distribution density of the V-shaped structures of the second negative Poisson's ratio support layer 500 is lower than that of the V-shaped structures in the first negative Poisson's ratio support layer 300. That is, in the circumferential direction, the number of the V-shaped structures in the second negative Poisson's ratio support layer 500 is greater than that of the V-shaped structures in the first negative Poisson's ratio support layer 300. In this way, when the residual limb tends to be separated from the receiving cavity, due to the effect of the pulling force, the V-shaped structures of the second negative Poisson's ratio support layer 500 of the outer layer are less densely distributed, and thus have stronger deformation ability, so that they can quickly respond to the change of the pulling force, and the active end of the V-shaped structure of the second negative Poisson's ratio support layer 500 can be moved to the contraction position from the original position more quickly. At the same time, the first negative Poisson's ratio support layer 300 of the inner layer is denser, and thus has high structural strength, so as to provide more stable support force, and thus can provide greater extrusion force to the mesh structure inner layer 200. Thus, the situation of accidental falling of the artificial limb can be more effectively reduced.
[0061] As shown in Figure 2 , Figure 3 , Figure 5 Further, the mesh structure inner layer 200 and the mesh structure interlayer 400 of the embodiment both comprise a plurality of first spiral support strips 210 arranged around the receiving cavity 110 and a plurality of second spiral support strips 220 arranged around the receiving cavity 110, the bottoms of the first spiral support strips 210 and the second spiral support strips 220 are both contracted toward the center and connected and fused, the spiral directions of the first spiral support strips 210 and the second spiral support strips 220 are opposite and interlaced to form a plurality of intersection nodes 221 and a plurality of diamond-shaped holes 230. By interlacing the first spiral support strips 210 and the second spiral support strips 220 to form a mesh structure, the mesh structure inner layer 200 and the mesh structure interlayer 400 have good mechanical support performance, and the mechanical performance of the flexible inner liner 100 is also improved when it is supported, so as to realize stable support. In the specific structure, a plurality of air permeable holes 120 are formed in the flexible inner liner 100, the air permeable holes 120 can be opposite to the diamond-shaped holes 230 on the mesh structure inner layer 200, and the shell 600 is a hollow shell 600. In use, external air can pass through the hollow shell 600, the mesh structure inner layer 200 and the mesh structure interlayer 400 and then enter the flexible inner liner 100 from the air permeable holes 120 on the flexible inner liner 100, so as to take away the sweat and heat on the surface of the residual limb, and keep the residual limb dry and comfortable.
[0062] As shown in Figure 2 , Figure 3As shown, one end of the first negative Poisson's ratio support layer 300 is connected to the intersection node 221 of the inner layer 200 of the net structure, and the other end is connected to the intersection node 221 of the interlayer 400 of the net structure. One end of the second negative Poisson's ratio support layer 500 is connected to the intersection node 221 of the interlayer 400 of the net structure, and the other end is connected to the outer shell 600. The intersection node 221 provides a stable support point for the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500, so that the first negative Poisson's ratio support layer 300 and the second negative Poisson's ratio support layer 500 in the radial direction can produce stable deformation in the radial direction.
[0063] As shown in Figure 2 , Figure 3 Further, the opening of the receiving cavity 110 of the embodiment is provided with a connecting rim 240, which is annular, and the connecting rim 240 connects the inner layer 200 of the net structure, the interlayer 400 of the net structure, and the outer shell 600. The upper ends of the plurality of first spiral support strips 210 and the upper ends of the plurality of second spiral support strips 220 are connected through the connecting rim 240. The opening of the receiving cavity 110 is smooth through the connecting rim 240, thereby facilitating the connection of the residual limb.
[0064] As shown in Figure 3 , Figure 5 Further, the lower ends of the plurality of first spiral support strips 210 and the lower ends of the plurality of second spiral support strips 220 of the embodiment are both converging towards the central axis of the receiving cavity 110 and connected. The convergence is achieved in the inner layer 200 of the net structure and the interlayer 400 of the net structure, respectively.
[0065] As shown in Figure 1 , Figure 2 The bottom of the outer shell 600 is provided with a connector 610, which is used for assembling with the external artificial limb.
[0066] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A cushioning layer structure for a prosthetic socket, characterized in that, The present application relates to a prosthetic socket, comprising: a netted inner layer, which surrounds and is used to connect a flexible inner liner to form a receiving cavity for connecting a user's residual limb; at least one first negative Poisson's ratio support layer, which is connected to the outside of the netted structure; at least one netted interlayer, which is arranged on the outside of the first negative Poisson's ratio support layer; at least one second negative Poisson's ratio support layer, which is arranged on the outside of the netted interlayer, and the outside of the second negative Poisson's ratio support layer is used to connect an outer shell; when the user's residual limb pulls away from the receiving cavity, the first negative Poisson's ratio support layer and the second negative Poisson's ratio support layer both expand towards the inside of the receiving cavity.
2. The cushioning layer structure of a prosthetic socket according to claim 1, wherein, The first negative Poisson's ratio support layer comprises a plurality of first support portions, which are arranged on the outer wall of the netted inner layer; one end of each of the first support portions is connected to the netted inner layer, and the other end is connected to the netted interlayer; on the longitudinal section of the receiving cavity and at the position corresponding to the side surface of the receiving cavity, the height of the first support portion near the end connected to the netted inner layer is lower than the height of the first support portion near the end connected to the netted interlayer.
3. The cushioning layer structure of a prosthetic socket according to claim 2, wherein, The first support portion comprises a first support column, one end of which is connected to the netted inner layer, and the other end is connected to the netted interlayer.
4. The cushioning layer structure of a prosthetic socket according to claim 3, wherein, The first support portion further comprises a second support column, one end of which is connected to the netted inner layer, and the other end is connected to the netted interlayer; on the transverse section of the receiving cavity, the second support column and the first support column are both arranged obliquely, and one end of the second support column is connected to one end of the first support column.
5. The cushioning layer structure of a prosthetic socket according to claim 2, wherein, The second negative Poisson's ratio support layer comprises a plurality of second support portions, one end of each of which is connected to the netted interlayer, and the other end is used to connect the outer shell.
6. The cushioning layer structure of a prosthetic socket according to claim 5, wherein, on the longitudinal section of the receiving cavity, the height of the second support portion near the end connected to the netted interlayer is lower than the height of the second support portion near the end connected to the outer shell.
7. The cushioning layer structure of a prosthetic socket according to claim 6, wherein, on the longitudinal section of the receiving cavity, the first support portions and the second support portions are staggered.
8. The cushioning layer structure of a prosthetic socket according to any one of claims 1 to 7, wherein The netted inner layer and the netted interlayer both comprise a plurality of first spiral support strips arranged around the receiving cavity and a plurality of second spiral support strips arranged around the receiving cavity, the spiral direction of the first spiral support strips is opposite to the spiral direction of the second spiral support strips, and the first spiral support strips and the second spiral support strips are staggered to form a plurality of intersection nodes and a plurality of diamond-shaped holes; one end of the first negative Poisson's ratio support layer is connected to the intersection node of the netted inner layer, and the other end is connected to the intersection node of the netted interlayer; one end of the second negative Poisson's ratio support layer is connected to the intersection node of the netted interlayer, and the other end is connected to the outer shell.
9. The cushioning layer structure of a prosthetic socket according to claim 8, wherein, a connecting rim is arranged at the opening of the receiving cavity, and the connecting rim connects the netted inner layer, the netted interlayer, and the outer shell; Upper ends of the plurality of first helical support strips and upper ends of the plurality of second helical support strips are connected by the connecting rim portion.
10. The cushioning layer structure of a prosthetic socket according to claim 8, wherein, Lower ends of the plurality of first helical support strips and lower ends of the plurality of second helical support strips are both gathered toward a central axis of the receiving cavity and connected.