CN216318241U

CN216318241U - 3D prints burden poisson ratio structure shock attenuation artificial limb and holds in palm chamber and burden poisson ratio structure

Info

Publication number: CN216318241U
Application number: CN202122264599.8U
Authority: CN
Inventors: 何晓东; 徐红岩
Original assignee: Cgn High Tech Nuclear Materials Technology Suzhou Co ltd
Current assignee: Cgn High Tech Nuclear Materials Technology Suzhou Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-04-19
Anticipated expiration: 2031-09-14

Abstract

The utility model discloses a 3D printing negative Poisson ratio structure damping artificial limb support cavity and a negative Poisson ratio structure, wherein the artificial limb support cavity is integrally formed by 3D printing of a thermoplastic material; the artificial limb support cavity comprises an upper surface and a lower surface, and the upper surface and the lower surface form a solid layer; the solid layer is internally and integrally formed with a negative Poisson ratio structure. The artificial limb support cavity is integrally printed and formed by the 3D printer, so that the problem of manufacturing a honeycomb microporous structure with a complex negative Poisson ratio structure inside, namely gradually extending from the center to the outside can be solved, and the excellent damping effect is realized by utilizing the micropores with the negative Poisson ratio structure inside the artificial limb support cavity.

Description

3D prints burden poisson ratio structure shock attenuation artificial limb and holds in palm chamber and burden poisson ratio structure

Technical Field

The utility model relates to the technical field of negative Poisson ratio material structures, in particular to a damping artificial limb support cavity of a 3D printing negative Poisson ratio structure and a negative Poisson ratio structure.

Background

The artificial limb support cavity is the most important component of the artificial limb, and the matching degree and the shock absorption effect of the artificial limb support cavity are extremely important.

If the prosthesis cavity is low in goodness of fit, the external pressure on the stump is uneven, so that lymphatic and venous return on the stump is blocked, stump edema can be generated until eczema, blister and chronic ulcer appear, even serious skin change appears at the mouth of the receiving cavity, and the stump can lose the bearing capacity.

If the damping effect of the artificial limb supporting cavity is poor, the stump is easy to be proliferated and hardened for a long time, the hardened skin causes the damping effect to be worse, the proliferation and hardening of the stump are further promoted, and a vicious circle is formed.

The traditional manual plaster mold taking method is difficult to ensure the accuracy. The operation is complicated and time-consuming, and repeated trial-manufacture and modification are needed, so that the manufacturing cost is high and the delivery time is long. And the hardness of each part of the used material is fixed singly, so that the best use effect is difficult to achieve.

In order to improve the shock attenuation effect that the artificial limb held in the palm the chamber, current shock attenuation technique has: one adopts a spring structure, and the other adopts an elastomer material. However, both of these approaches can make the prosthetic socket more bulky and less comfortable.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects of heavy artificial limb supporting cavity and low comfort caused by shock absorption in the prior art.

In order to solve the technical problem, the utility model provides a 3D printing negative Poisson ratio structure damping artificial limb support cavity which is integrally formed by 3D printing of a thermoplastic material; the artificial limb support cavity comprises an upper surface and a lower surface, and the upper surface and the lower surface form a solid layer; the solid layer is internally and integrally formed with a negative Poisson ratio structure.

In a preferred mode of the utility model, the prosthesis support cavity is made of at least one thermoplastic material.

In a preferred embodiment of the present invention, the upper skin layer, the negative poisson's ratio structure and the lower surface may be made of different thermoplastic materials.

In a preferred embodiment of the present invention, the negative poisson's ratio structure is symmetrical with respect to the initial layer.

In a preferred mode of the present invention, the artificial limb support cavity is bowl-shaped.

A negative Poisson ratio structure comprises a plurality of micropore units, wherein the sections of the micropore units are polygons; the outer side walls of the adjacent micropore units are connected; the micropore units are distributed along a straight line in the X-axis direction, and the micropore units are distributed in a staggered mode in the Y-axis direction.

In a preferred embodiment of the present invention, the cross section of the microporous unit is symmetrical about an X axis and/or a Y axis.

In a preferred embodiment of the present invention, the long axes of the cross sections of the pore units are elongated in a layer-by-layer manner in the Y-axis direction, the long axes of the pore units in the initial layer are the shortest, and the negative poisson's ratio structure is axisymmetric with respect to the initial layer.

In a preferred embodiment of the present invention, the major axis of the microporous unit is 0.1 to 100 mm.

In a preferred embodiment of the present invention, the wall thickness of the microporous unit is 0.1 to 400 μm.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

according to the damping artificial limb support cavity with the 3D printing negative Poisson ratio structure and the negative Poisson ratio structure, the artificial limb support cavity is integrally printed and formed by adopting a 3D printer, the problem that the interior of the artificial limb support cavity comprises a complex negative Poisson ratio structure, namely a cellular microporous structure which gradually extends from the center to the outside can be solved, and therefore the excellent damping effect is achieved by utilizing micropores of the negative Poisson ratio structure in the artificial limb support cavity. The 3D printing thermoplastic material with different hardness through composite use can improve the matching of the hardness requirements of different parts of the artificial limb supporting cavity, thereby solving the wearing experience problem of a user.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the artificial limb support cavity and the internal negative Poisson's ratio.

FIG. 2 is a schematic view of the solid layer partial surface ventilation holes of the present invention.

FIG. 3 is a schematic diagram of the negative Poisson ratio structure of the present invention.

The specification reference numbers indicate: 1. the artificial limb support cavity comprises an artificial limb support cavity, 11 parts of an upper surface, 12 parts of a lower surface, 13 parts of a negative Poisson's ratio structure, 131 parts of an initial layer, 2 parts of a micropore unit and 3 parts of a ventilation hole.

Detailed Description

The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "second" or "first" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features, or indirectly contacting the first and second features through intervening media. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements does not include a limitation to the listed steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1-3, in the embodiment of the utility model, a 3D printing negative poisson's ratio structural damping artificial limb support cavity is disclosed, and the artificial limb support cavity 1 is integrally formed by 3D printing thermoplastic materials. The artificial limb support cavity 1 comprises an upper surface 11 and a lower surface 12, wherein the upper surface 11 and the lower surface 12 form a solid layer. The solid layer is internally and integrally formed with a negative Poisson ratio structure 13. The artificial limb support cavity 1 is of an external solid internal porous foam structure, and the solid layer is wrapped outside the negative Poisson ratio structure 13.

The method comprises the steps of acquiring shape information of a residual limb by adopting CT data or a three-dimensional scanner, constructing a three-dimensional model of a prosthetic limb support cavity 1 according to scanning information, and integrally printing and forming the prosthetic limb support cavity 1 by adopting a 3D printer. And constructing a three-dimensional model of the artificial limb support cavity 1 according to the scanning information, wherein the shape and the size of an inner cavity of the three-dimensional model are 102-104% of the shape and the size of the residual limb, and the embodiment is preferably 103%.

The thickness of the artificial limb support cavity 1 is preferably 10-50 mm. The thickness of the solid layer is determined by the requirement for mechanical strength, and is preferably 0.1 to 5 mm. In order to increase the air permeability, the solid outer surface layer can be provided with a plurality of air holes 3, the air holes 3 are communicated with the micropore units 2 of the negative Poisson's ratio structure 13, and the diameter of the air holes 3 is preferably 1-5 mm.

The artificial limb support cavity 1 is made of at least one thermoplastic material. The upper skin, negative poisson's ratio structure 13 and the lower surface 12 may be formed from different thermoplastic materials.

The 3D printer may be a single-jet 3D printer or a dual-jet 3D printer, printing a single thermoplastic material or a composite of two thermoplastic materials, respectively. Specifically, the artificial limb support cavity 1 is printed by polypropylene and TPU/silicon rubber thermoplastic elastomer materials together, and the temperature of two nozzles of the double-nozzle 3D printer is set to be 210 ℃ and 190 ℃.

The polypropylene prints the lower surface 12 of the prosthetic socket cavity 1, and the TPU/silicone rubber thermoplastic elastomer prints the internal negative poisson's ratio structure 13 and the upper surface 11.

As shown in fig. 1, the artificial limb support cavity 1 is bowl-shaped, and the bowl-shaped artificial limb support cavity 1 is used for supporting a residual limb. The negative poisson's ratio structure 13 is symmetrical about the initial layer 131. The bottom of the artificial limb support cavity 1 is a stress area, and the initial layer 131 of the negative poisson ratio structure 13 is arranged in the middle layer of the bottom of the artificial limb support cavity 1, so that a better shock absorption effect is achieved.

The negative Poisson ratio structure 13 is printed out through the inside 3D of the material of the artificial limb support cavity 1, when the artificial limb is impacted when contacting the ground, the artificial limb constitutes the two-way contraction that the material arouses because of the negative Poisson ratio, make the impact force turn into the deformability rapidly and absorbed, density increases fast simultaneously, the impact resistance of the material has been strengthened, thereby make the artificial limb keep very high shock resistance and rebound damping performance, reach the shock attenuation effect that the at utmost improves the artificial limb, simultaneously because 3D prints the heaviness that also can avoid the artificial limb support cavity 1.

Through keeping partly bleeder vent 3 and the micropore unit 2 of inside negative poisson ratio structure 13 to link up on artificial limb support cavity 1 material surface, can solve the bad problem of residual limb in artificial limb support cavity 1 air permeability, fine realization artificial limb supports the inside air flow in cavity 1, realized ventilative and radiating function, the removal and the ventilative while of artificial limb go on, the production of artificial limb sweat has been reduced, make more comfortable in the patient use, the solution causes the problem of secondary damage to the residual limb tip.

Referring to fig. 3, in an embodiment of the negative poisson's ratio structure of the present invention, the negative poisson's ratio structure 13 includes a plurality of micro-pore units 2, and a cross section of each micro-pore unit 2 is a polygon. The outer side walls of the adjacent microporous units 2 are connected. The micropore units 2 are distributed along a straight line in the X-axis direction, and the micropore units 2 are distributed in a staggered mode in the Y-axis direction.

The micropore unit 2 is tubular, and the section of the micropore unit 2 is polygonal. In the X-axis direction, the micropore units 2 are sequentially arranged on the same horizontal plane, in the Y-axis direction, the micropore units 2 are distributed in a staggered mode, and the outer walls of the adjacent micropore units 2 are connected to form a negative Poisson ratio structure 13.

The cross section of the micropore unit 2 is symmetrical with an X axis and/or a Y axis. Preferably, the cross section of the microcellular cells 2 has a honeycomb structure.

In the Y-axis direction, the long axes of the cross sections of the microporous units 2 are elongated layer by layer, the long axes of the microporous units 2 of the initial layer 131 are the shortest, and the negative poisson's ratio structure 13 is symmetrical with the initial layer 131 as a symmetry axis.

That is, in the longitudinal direction, the cross section of the polygonal microporous unit 2 is gradually elongated with the change in the number of layers, forming a change from short to long starting from the initial layer 131. In the longitudinal direction, the long axis of the cross section of the microcell cells 2 gradually increases from the initial layer 131 to the upper and lower directions, respectively, layer by layer. The variation of the Young's modulus of the material is adjusted by the thickness of the cell walls of the elongated honeycomb-shaped micropores.

The long axis of the micropore unit 2 is 0.1-100 mm. The thickness of the pore wall of the micropore unit 2 is 0.1-400 mu m. The size of the pores is determined according to the structural strength and elasticity requirements and the elongated structural strength and elasticity, and as an optimal scheme, the major axis length of the microporous unit 2 of the initial layer 131 is 1mm, the maximum major axis length of the microporous unit 2 is 5mm, and the pore wall thickness of the microporous unit 2 is 200 μm.

The negative poisson's ratio structure 13 concentrates stress in the center by the strict radial arrangement of the microporous cell units, which can result in a negative poisson's ratio when the radial young's modulus is much greater than the tangential direction. The anisotropy of young's modulus is mainly caused by the anisotropy of cell geometry (i.e. slenderness ratio), while the gradient change of young's modulus is mainly caused by the strict orientation (i.e. radial alignment) of the cells.

The cell wall thickness of the elongated cellular pores described above has an effect on the impact resistance and resilience of the negative poisson's ratio material. According to different requirements of negative Poisson ratio material products, the negative Poisson ratio material with remarkable impact resistance or obvious elasticity is prepared by adjusting the thickness of the pore walls of the elongated honeycomb micropores. The variation of young's modulus can be adjusted by the cell wall thickness of the elongated honeycomb-shaped micro cells.

according to the damping artificial limb support cavity with the 3D printing negative Poisson ratio structure and the negative Poisson ratio structure, the artificial limb support cavity is integrally printed and formed by adopting a 3D printer, and the problem that the artificial limb support cavity is not matched with the end part of a residual limb is solved. The different soft or hard 3D of combined use prints thermoplastic material and improves the artificial limb and holds in the palm the matching of chamber 1 and the different position soft or hard demands of stub to solve user's wearing and experience problem, make the artificial limb support chamber 1 light and shock attenuation effect good.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.

Claims

1. A3D printing negative Poisson ratio structure damping artificial limb support cavity is characterized in that the artificial limb support cavity is integrally formed by 3D printing of thermoplastic materials; the artificial limb support cavity comprises an upper surface and a lower surface, and the upper surface and the lower surface form a solid layer; the solid layer is internally and integrally formed with a negative Poisson ratio structure.

2. The 3D printed negative poisson's ratio structural shock absorbing prosthetic socket as claimed in claim 1, wherein said prosthetic socket is constructed of at least one thermoplastic material.

3. The 3D printed negative poisson's ratio structural shock absorbing prosthetic socket as claimed in claim 1, wherein said upper surface, negative poisson's ratio structure and said lower surface may be formed from different thermoplastic materials.

4. A 3D printed negative poisson's ratio structural damped prosthetic limb socket as claimed in claim 1 or 2, wherein said negative poisson's ratio structure is symmetrical about an initial layer.

5. The 3D printed negative poisson's ratio structural shock absorbing prosthetic socket cavity of claim 1, wherein the prosthetic socket cavity is bowl-shaped.

6. A negative Poisson ratio structure, wherein the negative Poisson ratio structure of any one of claims 1-4 comprises a plurality of microcell units, the microcell units having a polygonal cross section; the outer side walls of the adjacent micropore units are connected; the micropore units are distributed along a straight line in the X-axis direction, and the micropore units are distributed in a staggered mode in the Y-axis direction.

7. A negative Poisson's ratio structure according to claim 6, wherein the cross-section of the microcell elements is symmetrical about the X-axis and/or the Y-axis.

8. The negative Poisson's ratio structure of claim 6, wherein in the Y-axis direction, the long axes of the cross-sections of the microcell elements are elongated layer by layer, the long axes of the microcell elements of the initial layer are shortest, and the negative Poisson's ratio structure is symmetrical with the initial layer as the axis of symmetry.

9. The negative Poisson's ratio structure of claim 6, wherein the major axis of the microporous unit is 0.1-100 mm.

10. The negative Poisson's ratio structure of claim 6, wherein the thickness of the pore wall of the microporous unit is 0.1-400 μm.