CN111249043B

CN111249043B - Controllable semi-open type constant force receiving cavity for lower limb artificial limb

Info

Publication number: CN111249043B
Application number: CN202010042044.6A
Authority: CN
Inventors: 王明辉; 钱玉; 张豪俊; 喻洪流
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2022-04-12
Anticipated expiration: 2040-01-15
Also published as: CN111249043A

Abstract

The invention discloses a controllable semi-open type constant force receiving cavity for a lower limb prosthesis. Relates to the technical field of artificial limbs in intelligent rehabilitation. Comprises a semi-open cavity, a component group, a flexible liner, a constant force device and a one-way exhaust valve; the semi-open cavity comprises an outer cavity and an inner cavity, and the outer cavity is connected with the inner cavity through the bottom; the member group is used for supporting and fixing a residual limb; the semi-open cavity and the member group are combined to suspend the residual limb; the flexible liner is arranged behind the semi-open cavity; the constant force device is attached to the semi-open cavity and the inner wall of the component group and transmits force and movement through the component group; the one-way exhaust valve is arranged on the outer surface of the semi-open cavity and penetrates through the semi-open cavity. The constant-force accepting cavity is reasonable in design and safe and reliable in structure, the weight of the constant-force accepting cavity is reduced, the wearing comfort of a patient is improved, and the constant-force accepting cavity is convenient for the patient to wear.

Description

Controllable semi-open type constant force receiving cavity for lower limb artificial limb

Technical Field

The invention relates to the technical field of artificial limbs in intelligent rehabilitation, in particular to the field of a controllable semi-open type constant force receiving cavity for a lower artificial limb.

Background

Lower limb dysfunction severely impedes one's ability to stand, walk or run, placing tremendous strain on one's physical and mental health and economic status. The artificial limb can replace partial function of the lost limb, so that the amputee can recover certain self-care and working ability. The socket is an important basis for the function of the artificial limb, and a good artificial limb socket needs to have high safety and comfort of wearing and function transmission accuracy of force and movement at the same time.

At present, the commonly used receiving cavity is a vacuum suspension receiving cavity, and the contact interface of the residual limb and the receiving cavity is in a negative pressure state by adopting a vacuum structure, so that the suspension property can be improved to a certain extent. It not only requires the socket to be fully contact and have a good fit, but also requires a sealed interface. Another common socket is a mechanically adjustable socket. This type of mechanically adjustable socket, by means of a tension dial and a ratchet belt, allows the user to control how tight the socket is connected, but this operation also has major drawbacks: due to the change in volume of the residual limb, the patient needs to constantly adjust the compressive force on his residual limb to accommodate it. At present, a constant force receiving cavity with a controllable function does not appear in the domestic rehabilitation field. Therefore, a semi-open type controllable constant force receiving cavity for a lower limb prosthesis needs to be designed, which can improve the wearing comfort of a patient and ensure the accuracy of force and motion transmission in the using process.

Therefore, those skilled in the art are devoted to developing a controllable semi-open constant force socket for a lower limb prosthesis, which can improve the comfort of wearing for a patient and ensure the accuracy of force and movement transmission during use.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a socket for a lower limb prosthesis, which can improve the comfort of the patient while ensuring the accuracy of the transmission of forces and movements during use.

In order to achieve the aim, the invention provides a controllable semi-open type constant force receiving cavity for a lower limb prosthesis, which comprises a semi-open cavity body, a component group, a flexible liner, a constant force device and a one-way exhaust valve; the semi-open cavity comprises an outer cavity and an inner cavity, and the outer cavity is connected with the inner cavity through the bottom; the member group is used for supporting and fixing a residual limb; the semi-open cavity and the member group are connected to suspend the residual limb; the flexible liner is arranged behind the semi-open cavity; the constant force device is attached to the semi-open cavity and the inner wall of the component group and transmits force and movement through the component group; the one-way exhaust valve is arranged on the outer surface of the constant force receiving cavity and penetrates through the semi-open cavity.

Further, the outer cavity is made of rigid materials, and the inner cavity is made of elastic materials.

Further, the member sets comprise a member set for supporting and longitudinally distributed relative to the residual limb and a transverse connecting member set for fixing, and the two are connected through a connecting assembly.

Further, the member group longitudinally distributed relative to the residual limb comprises a fixed supporting member and an adjusting strut member, wherein 7 holes are uniformly distributed in the adjusting strut member along a longitudinal central axis and used for adjusting the longitudinal position of the transverse connecting member group.

Further, the transverse connecting member set comprises a fixed supporting transverse connecting member, a transverse connecting and fixing member, a reinforcing transverse connecting and fixing member and a controllable rope.

Further, the flexible pad is designed with sufficient strength and resiliency to support the distribution of a portion of the pressure on its surface away from the stanchion or other weight support member.

Further, the constant force device comprises three groups which are evenly and circumferentially attached to the component groups distributed longitudinally relative to the residual limb and the inner wall of the outer cavity.

Furthermore, the outer surface of the constant force device is attached to the inner surface of the constant force receiving cavity, the inner surface of the constant force device is in contact with the stump, the inner surface and the outer surface of the constant force device are made of rigid materials, and two side surfaces of the constant force device are made of polyethylene or other flexible materials with certain hardness and toughness.

Furthermore, a limiting pin and a plug pin column are arranged in the constant force device, a hole is formed in the plug pin column and used for placing the NiTi shape memory alloy, the limiting pin enables the NiTi shape memory alloy to be compressed perpendicular to the surface of the residual limb, and the compression distance of the NiTi shape memory alloy is ensured.

Further, the member set can change the contour size with the size of the residual limb through the modular design.

The invention provides a controllable semi-open type constant force receiving cavity for a lower limb prosthesis, which has the following technical effects:

1. the constant force device is designed by utilizing the special mechanical characteristic of shape memory alloy superelasticity, so that the constant force loading of the residual limb is realized, and the problem of safety and comfort of the constant force receiving cavity is solved;

2. the compression state of the constant force device is driven by the controllable rope in the transverse connecting fixing component group, and the patient can adjust the controllable rope no matter how the residual limb changes, so that the state of the constant force device is driven to make adaptive change until the residual limb feels comfortable, and the self-adaptability of the constant force receiving cavity and the comfort of the patient are improved;

3. through the modular design of the component group, the contour or the size of the component group changes along with the change of the residual limb, the weight of the constant force receiving cavity is reduced to a great extent, and the wearing of a patient is facilitated.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic structural view of a controllable semi-open constant force socket for a lower limb prosthesis according to a preferred embodiment of the invention;

FIG. 2 is a schematic diagram of the set of components longitudinally distributed relative to the residual limb in accordance with a preferred embodiment of the present invention;

FIG. 3 is a schematic view of a transverse link assembly according to a preferred embodiment of the present invention;

fig. 4 is a schematic view of a constant force apparatus according to a preferred embodiment of the present invention.

The artificial limb stump comprises a 1-semi-open cavity, a 2-component group, a 3-flexible liner, a 4-constant force device, a 5-one-way exhaust valve, an 11-outer cavity, a 12-inner cavity, a 21-component group distributed longitudinally relative to the stump, a 22-transverse connecting component group, a 211-fixed supporting component, a 212-adjusting strut component, a 221-fixed supporting transverse connecting component, a 222-transverse connecting fixing component, a 223-reinforced transverse connecting fixing component, a 224-controllable rope, a 41-constant force device outer surface, a 42-constant force device inner surface, 43-constant force device two side surfaces, 44-NiTi shape memory alloy, 45-plug pin columns and 46-limiting pins.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

As shown in figure 1, a controllable semi-open type constant force receiving cavity for a lower limb prosthesis comprises a semi-open cavity body 1, a component group 2, a flexible liner 3, a constant force device 4 and a one-way exhaust valve 5. Wherein, the semi-open cavity 1 comprises an outer cavity 11 and an inner cavity 12, and the outer cavity 11 is connected with the inner cavity 12 through a base. The set 2 comprises a set 21 of members longitudinally distributed with respect to the residual limb and a set 22 of transverse connecting members. The semi-open chamber 1 only contacts and supports the residual limb near 1/3 and is able to contain the base of the residual limb. The outer cavity 11 is a rigid structure and plays a role in fixing and supporting; the inner cavity 12 is of a flexible structure and has certain hardness, so that the inner cavity can play a role in making a patient comfortable; a flexible pad 3 is added to the ischial weight bearing portion, and the flexible pad 3 is designed to have sufficient strength and resilience to support the distribution of a portion of the pressure on its surface remote from the spine or other weight support member. The outer surface of the constant force receiving cavity is provided with a one-way exhaust valve 5 which penetrates through the outer cavity 11 and the inner cavity 12, and finally the longitudinal suspension performance of the constant force receiving cavity part can be realized. The components of these sets of components can be of modular design, which can vary in contour or size with the residual limb, and by this modular design the weight of the constant force socket can be reduced to a large extent, while at the same time being easy to wear by the patient.

As shown in fig. 2 and 1, the set 21 of members distributed longitudinally with respect to the residual limb includes 2

fixed support members

211 and 2 adjustment strut members 212. Wherein 2 fixed support members 211 are respectively disposed at the left and right, and 2 adjusting stay members 212 are respectively disposed at the left and right. Each member of the set 2 has a distal end and a proximal end. The proximal end portion of the fixing support member 211 is disposed between the outer chamber 11 and the inner chamber 12, and functions to fix and support the residual limb, and the inner surface is in contact with and attached to the residual limb to apply a certain force to the residual limb, thereby realizing the force transmission function of the constant force receiving chamber. The inner surface of the adjusting strut member 212 is respectively matched with the outer surface of the fixed supporting member 211, and forms a left supporting member group and a right supporting member group with the fixed supporting member 211, so that the support to the residual limb is enhanced, and the function of partial constant force receiving cavity suspension is realized in the longitudinal direction. The adjusting strut members 212 are evenly distributed with 7 holes longitudinally along the central axis and can be used to adjust the longitudinal position of the set of transverse connecting members 22 according to the individual stump condition of the patient.

As shown in fig. 3, 1 and 2, the set of transverse connecting members 22 is divided into a fixed support transverse connecting member 221, a transverse connecting fixing member 222, a reinforcing transverse connecting fixing member 223 and a controllable tether 224. The fixed support transverse connecting component 221 and the transverse connecting and fixing component 222 can both play a role in transversely fixing the prosthetic socket; the reinforcing transverse connecting and fixing member 223 integrally connects the fixed support member 212 and the outer cavity 11, and plays a role in transverse fixing and reinforcing; the controllable rope 224 is used for the patient to wear or remove the constant force socket, when the patient wants to wear the controllable semi-open constant force socket of the lower limb prosthesis, the patient only needs to firstly loosen the controllable rope 224 and then tighten the controllable rope 224 to a proper position; when the patient wants to dismount the constant-force receiving cavity, the patient only needs to loosen the controllable rope 224 aside, and the operation is extremely simple and convenient.

As shown in fig. 4 and 2, the constant force devices 4 are provided in three groups, respectively, in the middle of the semi-open chamber 1 and on the inner surface of the fixed support member 211. The outer surface 41 of the constant force device is attached to the inner surface of the inner cavity 12, the inner surface 42 of the constant force device is in contact with the stump, and both are made of rigid materials; the two side surfaces 43 of the constant force mechanism device are made of flexible materials, and the flexible materials have certain hardness and certain toughness, such as polyethylene or materials with better performance, so as to ensure the flexibility of the constant force device 4; the pin column 45 is provided with a hole for placing the NiTi shape memory alloy 44; the spacing pin 46 ensures that the NiTi shape memory alloy 44 compresses perpendicular to the surface of the residual limb while ensuring the compression distance of the NiTi shape memory alloy 44.

The invention relieves the condition that the residual limb is stressed too much or too little through the constant force device 4, so that the residual limb can be stressed by a comfortable constant force under any condition; the compression state of the constant force device 4 is driven by the controllable rope 224, and the patient can adjust the controllable rope 224 no matter how the residual limb changes, so that the state of the constant force device 4 is driven to make adaptive change until the residual limb feels comfortable and the constant force receiving cavity can be adjusted or worn.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. A controllable semi-open type constant force receiving cavity for a lower limb artificial limb is characterized by comprising a semi-open cavity body, a component group, a flexible liner, a constant force device and a one-way exhaust valve; the semi-open cavity comprises an outer cavity and an inner cavity, and the outer cavity is connected with the inner cavity through the bottom; the member group is used for supporting and fixing a residual limb; the semi-open cavity and the member group are connected to suspend the residual limb; the flexible liner is arranged behind the semi-open cavity; the constant force device is attached to the semi-open cavity and the inner wall of the component group and transmits force and movement through the component group; the one-way exhaust valve is arranged on the outer surface of the constant-force receiving cavity and penetrates through the semi-open cavity;

the component group comprises a component group which is used for supporting and longitudinally distributed relative to the residual limb and a transverse connecting component group which is used for fixing, and the component group and the transverse connecting component group are connected through a connecting component; the transverse connecting component group comprises a fixed supporting transverse connecting component, a transverse connecting and fixing component, a reinforcing transverse connecting and fixing component and a controllable rope; the controllable tether is configured to drive a compression state of the constant force device;

the constant force device comprises three groups, and is uniformly and circumferentially attached to the component group longitudinally distributed relative to the residual limb and the inner wall of the outer cavity; the outer surface of the constant force device is attached to the inner surface of the constant force receiving cavity, the inner surface of the constant force device is configured to be in contact with the stump, the inner surface and the outer surface of the constant force device are both made of rigid materials, and two side surfaces of the constant force device are made of polyethylene or other flexible materials with certain hardness and toughness; the constant force device is characterized in that a limiting pin and a bolt column are arranged inside the constant force device, a hole is formed in the bolt column and used for placing NiTi shape memory alloy, the limiting pin enables the NiTi shape memory alloy to be compressed perpendicular to the surface of the residual limb, and the compression distance of the NiTi shape memory alloy is guaranteed.

2. A controlled semi-open constant force socket for a lower limb prosthesis according to claim 1, wherein the outer chamber is of a rigid material and the inner chamber is of an elastomeric material.

3. A controlled semi-open constant force socket for a lower limb prosthesis according to claim 1, wherein the set of members distributed longitudinally with respect to the residual limb comprises a fixed support member and an adjusting strut member, the adjusting strut member being evenly distributed with 7 holes along a central longitudinal axis for adjusting the longitudinal position of the set of transverse connecting members.

4. A controlled semi-open constant force socket for a lower limb prosthesis according to claim 1, wherein the flexible liner is designed with sufficient strength and resilience to support the distribution of a portion of the pressure on its surface remote from the strut or other weight support member.

5. A controlled semi-open constant force socket for a lower limb prosthesis according to claim 1, wherein the set of members is modular in design such that its profile dimensions vary with the size of the residual limb.