Constant-force gas spring hydraulic drive type artificial limb socket

Abstract

The invention provides a constant-force gas spring hydraulic drive type artificial limb socket. The constant-force gas spring hydraulic drive type artificial limb socket comprises an artificial limb socket shell and a plurality of constant-force compression assemblies. The constant-force compression assemblies are circumferentially arranged around the inner ring of the prosthetic socket shell at equal intervals; the constant-force compression assembly comprises a constant-force driving mechanism, a guide limiting mechanism and an extrusion plate; the extrusion plate is in transmission connection with the constant-force driving mechanism, and the extrusion plate is limited and fixed with the constant-force driving mechanism through the guide limiting mechanism; the constant force driving module is designed according to the constant force output characteristic of the gas spring, automatic adjustment of the volume of the residual limb within the constant force range is achieved, the problems of skin injury and the like caused by too large stress between an artificial limb socket and the residual limb are solved, and the wearing comfort of a patient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical rehabilitation equipment, and in particular to a constant-force gas spring hydraulically driven prosthetic receiving cavity. Background Art

[0002] A prosthesis is an artificial device that is used by amputees through engineering technology to compensate for the function of their missing limbs and help them regain a certain degree of self-care and work ability. A good prosthesis not only needs to be highly comfortable to wear, but also needs to have excellent motion transmission.

[0003] Most of the existing prosthetic sockets are not adjustable, while the volume of the residual limb is variable, which will affect the adaptability of the prosthetic socket and the residual limb, thereby reducing the comfort of the patient's residual limb, especially after long-term use, it is more likely to cause residual limb pain and skin damage. Therefore, in the daily life of the patient, it is necessary to constantly adjust the adaptability relationship between the patient's residual limb and the prosthetic socket to adapt to the volume change of the residual limb, which is time-consuming and laborious. At the same time, in the face of some prostheses with relatively poor adjustment performance, they need to be replaced, which is not economical. Summary of the invention

[0004] The purpose of the present invention is to propose a constant-force gas spring hydraulically driven prosthetic receiving cavity, which can not only improve the wearing comfort of the patient, but also ensure the accuracy of force and motion transmission during use.

[0005] To achieve the above-mentioned object, the present invention proposes a constant-force gas spring hydraulically driven prosthetic receiving cavity, characterized in that it comprises a prosthetic receiving cavity shell and a plurality of groups of constant-force compression components;

[0006] A plurality of groups of constant force compression components are circumferentially arranged at equal intervals around the inner circle of the prosthetic socket shell;

[0007] The constant force compression assembly includes a constant force driving mechanism, a guide limiting mechanism and an extrusion plate; the extrusion plate is transmission-connected to the constant force driving mechanism, and the extrusion plate is limited and fixed to the constant force driving mechanism through the guide limiting mechanism.

[0008] Further, the constant force drive mechanism includes a gas hydraulic cylinder and a drive connection member;

[0009] The gas-hydraulic cylinder comprises a cylinder body and a bidirectional piston rod; the cylinder body is provided with an air cavity, a hydraulic cavity, an oil transmission hole and a limit installation hole in sequence along its axial direction; the bidirectional piston rod is inserted into the cylinder body, one end of the bidirectional piston rod is located in the air cavity, and the other end is located in the hydraulic cavity;

[0010] The piston surface in the air cavity is provided with air holes. After the air cavity is filled with gas, even if the piston moves in the air cavity, the upper and lower end surfaces of the piston are always subjected to constant pressure due to the air holes, thus forming a gas spring structure.

[0011] The hydraulic chamber is connected to the oil transmission hole through the damping hole. After one end of the driving connector is plugged into the oil transmission hole, a closed oil chamber is formed through the sealing rubber ring; the other end of the driving connector is connected to the back of the extrusion plate;

[0012] One end of the guide limiting mechanism is inserted into the limiting installation hole, and the other end is connected to the back of the extrusion plate.

[0013] Furthermore, a partition is provided between the air cavity and the hydraulic cavity, and a through hole for inserting the bidirectional piston rod is preset on the partition, and the hole wall and the bidirectional piston rod are sealed by a first sealing gasket.

[0014] Furthermore, the side wall of the piston located in the hydraulic chamber is sealed with the inner wall of the hydraulic chamber through a second sealing gasket.

[0015] Furthermore, a fan-shaped air pressure hole is provided at one end of the hydraulic cavity facing the air cavity.

[0016] Furthermore, the oil transmission hole and the limit installation hole are both opened on the side wall of the cylinder body.

[0017] Furthermore, the side wall of the prosthetic receiving cavity shell is provided with a plurality of ventilation slots;

[0018] The bottom of the prosthetic receiving cavity shell is provided with a base connected with the prosthesis.

[0019] Furthermore, a slot for plugging into the hydraulic chamber is preset on the side wall of the prosthetic receiving cavity shell.

[0020] Furthermore, the guide limit mechanism is a limit rod, one end of which is connected to the limit hole on the back of the extrusion plate, and the other end of which is extended and inserted into the limit installation hole;

[0021] An active gap is reserved between the end of the limiting rod and the bottom of the limiting mounting hole.

[0022] Furthermore, the sides of the extruded plate are all curved surfaces.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] 1. The constant force drive module is designed by utilizing the constant force output characteristics of the gas spring to realize automatic adjustment of the residual limb volume within the constant force range, solving problems such as skin damage caused by excessive stress between the prosthetic socket and the residual limb, and improving the wearing comfort of the patient.

[0025] 2. By combining oil transmission with the damping hole structure, the force deflection of the gas spring structure is achieved, while maintaining the motion transferability of the prosthetic socket under possible high-speed movement conditions.

[0026] 3. Maintain the suspension performance of the prosthetic socket through constant force extrusion in a pre-compression manner, while ensuring the force and motion transmission of the prosthetic socket in daily life.

[0027] 4. The extrusion plate reduces the contact area between the prosthetic cavity and the skin, increases the heat dissipation area, and avoids residual limb damage caused by factors such as sweating of the residual limb.

[0028] 5. The use of universal design reduces the cost of customizing the prosthetic socket, while avoiding the failure of the prosthetic socket and the residual limb due to fluctuations in the volume of the residual limb, thereby reducing expenses.

[0029] 6. The present invention provides a constant-force gas spring hydraulically driven prosthetic receiving cavity, which adapts to the volume of the residual limb through the constant-force driving module, realizes automatic adjustment of the interface stress, improves the adaptability between the prosthetic receiving cavity and the residual limb, ensures good suspension performance through pre-compression by the extrusion module, and improves the accuracy of force and motion transmission during use, thereby improving the comfort and satisfaction of patients wearing the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the constant force gas spring hydraulically driven prosthetic receiving cavity in an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a constant force driving mechanism in an embodiment of the present invention;

[0032] Figure 3 for Figure 2 AA section view of the constant force drive mechanism;

[0033] Figure 4 This is an enlarged view of the air vent portion of the constant force driving mechanism in the embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of a constant force gas spring hydraulically driven prosthetic receiving cavity extrusion plate in Example 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the driving connector in the constant force gas spring hydraulically driven prosthetic receiving cavity in Example 1 of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the guide and limiting mechanism in the constant force gas spring hydraulically driven prosthetic receiving cavity in Example 1 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0038] like Figure 1As shown, the present invention proposes a constant force gas spring hydraulically driven prosthetic receiving cavity, which is composed of a prosthetic receiving cavity shell 2 and a constant force compression component. The specific structure is as follows:

[0039] In this embodiment, four slots are provided on the inner wall of the prosthetic receiving cavity shell 2, and the four slots are arranged at equal intervals along the inner wall of the prosthetic receiving cavity shell 2, which helps to firmly clamp the severed limb. Generally speaking, the number of slots is not less than three. A set of constant force compression components is inserted and fixed in each slot, so the number of constant force compression components is also four.

[0040] In this embodiment, the constant force compression assembly is composed of a gas-hydraulic cylinder 3, a driving connector 5, a guide limit rod 4 and a squeeze plate 6. The gas-hydraulic cylinder 3 is inserted into the slot of the prosthetic receiving cavity shell 2, and after insertion, it is fixed by bolts or buckles. The fixed gas-hydraulic cylinder 3 is connected to the back of the pressure plate through the driving connector 5 and the guide limit rod 4.

[0041] Specifically, Figure 2 and Figure 3 As shown, the air-hydraulic cylinder 3 includes a cylinder body 304 and a bidirectional piston rod 301; the interior of the cylinder body 304 is provided with an air cavity 305, a hydraulic cavity 306, an oil transmission hole 307 and a limit mounting hole 308 in sequence along its axial direction; a partition is provided between the air cavity 305 and the hydraulic cavity 306, and a through hole for inserting the bidirectional piston rod 301 is preset on the partition, and the hole wall of the through hole and the piston rod are sealed by a first sealing gasket 302; the bidirectional piston rod 301 is inserted into the interior of the cylinder body 304 after passing through the partition, one end of the bidirectional piston rod 301 is located in the air cavity 305, and the other end is located in the hydraulic cavity 306, and the piston in the hydraulic cavity 306 is sealed with the inner wall of the hydraulic cavity 306 by a second sealing gasket 303.

[0042] The piston surface located in the air cavity 305 is provided with an air vent 309. When the air cavity 305 is filled with gas, pressure will be applied to this part of the piston surface. Due to the existence of the air vent 309, even if the piston is displaced in the air cavity 305, the upper and lower end faces of the piston are always subjected to constant pressure, thus forming a gas spring structure. In addition, the pressure on the rodless surface of this part of the piston is always greater than the pressure on the rodded surface, and the magnitude of the pressure depends on the air pressure in the cavity.

[0043] The hydraulic chamber 306 is connected to the oil transmission hole 307 through the damping hole. After one end of the driving connector 5 is inserted into the oil transmission hole 307, a sealed oil chamber is formed through the sealing rubber ring 501. The sealed oil chamber and the piston part form a damper structure. When the closed oil chamber is filled with liquid, the incompressible hydraulic oil is used to transmit force to control the movement speed and improve the movement sensing between the residual limb and the prosthetic receiving cavity. The oil transmission hole 307 and the limit installation hole 308 are connected to other parts to form a constant force transmission structure, which is used to convert and control the direction of the output force through Pascal's law. In addition, if Figure 4 As shown, a fan-shaped air pressure hole 310 is opened at one end of the hydraulic cavity 306 facing the air cavity 305, which is used to eliminate the negative pressure generated in the hydraulic cavity 306 when the piston rod moves.

[0044] In this embodiment, if Figure 3 As shown, an oil transmission hole 307 and a limit installation hole 308 are opened on the side wall of the cylinder body 304; Figure 5 As shown, a limiting hole 601 and a drive installation hole 602 are provided on the back of the extrusion plate 6; Figure 7 As shown, one end of the guide limit rod 4 is connected to the limit installation hole 308, and the other end is connected to the limit hole 601 on the back of the extrusion plate 6. A movable gap is reserved between the end of the guide limit rod 4 and the bottom of the limit installation hole 308 to ensure that the extrusion plate 6 can move outward. Figure 6 As shown, one end of the driving connecting member 5 is connected to the oil transmission hole 307 , and the other end is connected to the driving mounting hole 602 .

[0045] In this embodiment, the side wall of the prosthetic receiving cavity shell 2 is provided with a plurality of ventilation slots to prevent residual limb damage caused by factors such as residual limb sweating; the bottom of the prosthetic receiving cavity shell 2 is provided with a base 1 connected to the prosthesis. The sides of the extrusion plate 6 are all curved surfaces to prevent problems such as skin damage caused by excessive stress between the prosthetic receiving cavity and the residual limb, thereby improving the comfort of the patient.

[0046] Specifically, the working principle of the present invention is as follows: the residual limb is placed in the prosthetic receiving cavity inside the device shell, and is compressed and fixed to the residual limb by the extrusion plates 6 on four sides. In the case of long-term use, the residual limb may be deformed. At this time, the four extrusion plates 6 may automatically expand and contract based on the deformation of the residual limb to adapt to the shape of the residual limb. However, due to the existence of the constant pressure air cavity 305, the four extrusion plates 6 after expansion and contraction can provide the same pressure, avoiding problems such as skin damage caused by excessive stress between the prosthetic receiving cavity and the residual limb, thereby improving the wearing comfort of the patient.

[0047] Correspondingly, the principle of automatic extension and retraction of the squeezing plate 6 is as follows: if the residual limb is deformed, causing a part of the cross section to be separated from the surface of the squeezing plate 6, since the pressure on the rodless surface of the piston in the air cavity 305 is always greater than the pressure on the rod surface, at this time, the piston rod is displaced as a whole to the hydraulic cavity 306 under the action of the air pressure, and the liquid pushes the driving connector 5 to drive the squeezing plate 6 to move toward the surface of the residual limb, so as to fit the surface of the residual limb. If the residual limb is deformed, causing a part of the cross section to continue to be squeezed onto the squeezing plate 6, at this time, the driving connector 5 squeezes the liquid, and the liquid pushes the piston rod to move as a whole to the air cavity 305 until the squeezing plate 6 fits the surface of the residual limb; since the pressure in the air cavity 305 is constant, even if the piston rod is displaced, the pressure of each squeezing plate 6 is constant and the same.

[0048] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A constant force gas spring hydraulically driven prosthetic receiving cavity, characterized in that: It includes a prosthetic socket shell and a plurality of groups of constant force compression components; Multiple groups of the constant force compression components are circumferentially arranged at equal intervals around the inner circle of the prosthetic receiving cavity shell; The constant force compression assembly includes a constant force driving mechanism, a guide limiting mechanism and an extrusion plate; the extrusion plate is transmission-connected to the constant force driving mechanism, and the extrusion plate is limited and fixed to the constant force driving mechanism through the guide limiting mechanism.

2. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 1, characterized in that: The constant force driving mechanism comprises a gas hydraulic cylinder and a driving connecting piece; The gas-hydraulic cylinder comprises a cylinder body and a bidirectional piston rod; the cylinder body is provided with an air cavity, a hydraulic cavity, an oil transmission hole and a limit installation hole in sequence along its axial direction; the bidirectional piston rod is inserted into the cylinder body, one end of the bidirectional piston rod is located in the air cavity, and the other end is located in the hydraulic cavity; The piston surface in the air cavity is provided with an air vent. After the air cavity is filled with gas, even if the piston is displaced in the air cavity, the upper and lower end surfaces of the piston are always subjected to a constant pressure difference due to the air vent, thereby forming a gas spring structure. The hydraulic chamber is connected to the oil transmission hole through a damping hole. After one end of the driving connector is plugged into the oil transmission hole, a sealed oil chamber is formed through a sealing rubber ring; the other end of the driving connector is connected to the back of the extrusion plate; One end of the guide limiting mechanism is inserted into the limiting installation hole, and the other end is connected to the back of the extrusion plate.

3. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: A partition is provided between the air cavity and the hydraulic cavity. A through hole for the bidirectional piston rod to penetrate is preset on the partition. The hole wall and the bidirectional piston rod are sealed by a first sealing gasket.

4. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: The side wall of the piston located in the hydraulic chamber is sealed with the inner wall of the hydraulic chamber through a second sealing gasket.

5. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: A fan-shaped air pressure hole is formed at one end of the hydraulic cavity facing the air cavity.

6. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: The oil transmission hole and the limit installation hole are both arranged on the side wall of the cylinder body.

7. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 1, characterized in that: The side wall of the prosthetic receiving cavity shell is provided with a plurality of ventilation slots; The bottom of the prosthesis receiving cavity shell is provided with a base connected with the prosthesis.

8. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 1, characterized in that: The side wall of the prosthesis receiving cavity shell is preset with a slot for plugging into the hydraulic cavity.

9. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: The guide limit mechanism is a limit rod, one end of which is connected to the limit hole on the back of the extrusion plate, and the other end of which extends and is inserted into the limit installation hole; An active gap is reserved between the end of the limiting rod and the bottom of the limiting mounting hole.

10. The constant force gas spring hydraulically driven prosthetic receiving cavity according to claim 2, characterized in that: The sides of the extruded plate are all curved surfaces.

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