CN112842641A

CN112842641A - Artificial limb knee joint and rotary adjusting mechanism thereof

Info

Publication number: CN112842641A
Application number: CN202110157537.9A
Authority: CN
Inventors: 李林娥
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-05-28

Abstract

The invention relates to the technical field of artificial limbs, in particular to a rotary adjusting mechanism for a knee joint of an artificial limb, which comprises a barrel and a supporting rod, wherein the barrel is of a cylindrical shell structure with a round hole formed in the top surface, a first rotating seat is fixed at the bottom of the barrel and is arranged to be conveniently connected with a corresponding knee joint part, a return spring is fixed at the inner bottom of the barrel, a second piston is fixed at the top end of the return spring and is in sliding connection with the inner wall of the barrel, and the first piston is arranged in the barrel and positioned at the upper part of the second piston. According to the invention, the rotation of the adjusting knob is converted into the rotation of the bidirectional screw rod through the meshing of the worm wheel and the worm, and meanwhile, the worm wheel and the worm have a self-locking function, so that the displacement of the piston III caused by the use of a patient is prevented, and the self-locking performance after adjustment and the use experience of the patient are improved.

Description

Artificial limb knee joint and rotary adjusting mechanism thereof

Technical Field

The invention relates to the technical field of artificial limbs, in particular to an artificial limb knee joint and a rotation adjusting mechanism thereof.

Background

Artificial limbs are artificial prostheses, also called "artificial limbs", which are specially designed and assembled to compensate for amputees or incomplete limb defects. It is mainly used for replacing partial function of the lost limb, and recovering a certain self-care and working ability of the amputee. The suitable object is amputee caused by diseases, traffic accidents, industrial accidents, sports injuries and the like. Walking is the most basic function of the lower limbs of the human body, and amputation of limbs (except toes) on any plane of the lower limbs brings difficulty to walking. Poor walking posture can also greatly interfere with the overall aesthetic appeal of a person. Therefore, the lower limb prosthesis also has the basic purpose of restoring the normal walking posture of the human as much as possible. At present, the lower limb artificial limb can be divided into several categories according to different amputation planes of the lower limb: ankle prostheses, calf prostheses, thigh prostheses, and hip prosthesis. No matter which plane is the artificial limb after amputation, the aims of supporting the body and walking can be achieved.

To the patient of thigh amputation, the core part of guaranteeing patient's normal motion is exactly the knee joint, the knee joint is at the in-process that uses, it can slow down the action of offeing and bending to guarantee the patient, wherein, what knee joint buffering and crooked action was used is the damping telescopic link, because patient's weight is not understood, the buffer coefficient of damping telescopic link is different, set the damping telescopic link into rotation regulation formula usually, make things convenient for the patient to adjust as required, the damping telescopic link of present rotation regulation formula is adjusted the patient and is difficult for applying external force, and the auto-lock performance is poor, the patient uses after a period, the adjusting position of damping telescopic link changes, need often to adjust, influence the patient and use experience.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide an artificial limb knee joint and a rotary adjusting mechanism thereof, wherein the rotation of an adjusting knob is converted into the rotation of a bidirectional screw rod through the meshing of a worm wheel and a worm, and meanwhile, the worm wheel and the worm have a self-locking function, so that the displacement of a piston III caused by the use of a patient is prevented, and the self-locking performance after adjustment and the use experience of the patient are improved; make things convenient for the medium of barrel to flow through setting up the chamfer, then the aperture with circulation hole two is the same with circulation hole one, and the cross sectional area of circulation hole one is less than the area in clearance between piston outer wall and the barrel inner wall, avoids like this in accommodation process, too big fluid, influences the stability of knee joint, and be 5 times of screw sleeve length with two-way lead screw thread part length, can guarantee like this that piston three has great displacement volume, corresponding control range is more extensive, it is wide to be suitable for the crowd.

The purpose of the invention can be realized by the following technical scheme:

a rotary adjusting mechanism for a prosthetic knee joint comprises a barrel and a supporting rod, wherein the barrel is of a cylindrical shell structure with a round hole formed in the top surface, a first rotating seat is fixed at the bottom of the barrel and is arranged to be conveniently connected with a corresponding knee joint part, a return spring is fixed at the inner bottom of the barrel, a second piston is fixed at the top end of the return spring and is in sliding connection with the inner wall of the barrel, a first piston is arranged inside the barrel and is positioned on the upper portion of the second piston, the outer wall of the first piston is in clearance fit with the inner wall of the barrel, through arranging the outer wall of the first piston in clearance fit with the inner wall of the barrel, when the supporting rod moves relatively, an internal medium of the barrel can flow up and down, the supporting rod is fixed at the central position of the top surface of the first piston and penetrates through the round hole in the top surface of the barrel and, a second rotating seat is fixed at the top end of the supporting rod and is arranged to be conveniently connected with the corresponding knee joint part;

an outer connecting shell is fixed on the side wall, close to the top surface, of the barrel, a rotary seat is fixed in the middle of the side wall of the outer connecting shell, a shaft rod penetrating and extending to the outside of the rotary seat is rotatably connected inside the rotary seat, an adjusting knob is fixedly connected to the outer end of the shaft rod in a clamping manner, so that a patient can drive the shaft rod to rotate through the adjusting knob, a worm is fixedly sleeved on the outer wall of the shaft rod, which is located inside the rotary seat, is symmetrically and slidably connected with two pistons III relative to the horizontal central plane of the outer connecting shell, threaded sleeves are fixed on the surfaces of the two pistons III relative to the horizontal central plane of the outer connecting shell, a bidirectional lead screw is rotatably connected between the two threaded sleeves, a worm wheel is fixed on the position, corresponding to the worm, of the outer wall of the bidirectional lead screw, and is in meshing transmission with the worm, the rotation of the adjusting knob is converted into the rotation of the bidirectional screw rod, the worm wheel and the worm have a self-locking function, the third piston is prevented from shifting when a patient uses the automatic adjusting knob, and the outer wall of the cylinder body, which is close to the inner top surface and the inner bottom surface of the outer connecting shell, is respectively provided with the second circulation hole and the first circulation hole.

Further, the method comprises the following steps: the clearance between the outer wall of the first piston and the inner wall of the cylinder body is 0.5mm, chamfers are arranged on the top side edge and the bottom side edge of the first piston, and the medium of the cylinder body can flow conveniently through the chamfers.

Further, the method comprises the following steps: the aperture of the second circulation hole is the same as that of the first circulation hole, and the cross-sectional area of the first circulation hole is smaller than that of a gap between the outer wall of the first piston and the inner wall of the cylinder, so that the influence of overlarge fluid on the stability of the knee joint in the adjusting process is avoided.

Further, the method comprises the following steps: the length of the threaded part of the bidirectional screw is 5 times of that of the threaded sleeve, so that the third piston can be guaranteed to have larger displacement, the corresponding adjusting range is wider, and the range of applicable people is wide.

Further, the method comprises the following steps: the barrel is fixed with the sealing rubber circle for top surface round hole inner wall embedding, and the sealing rubber circle is interference fit with the outer wall of bracing piece, can improve the inside leakproofness of barrel like this.

Further, the method comprises the following steps: and air or hydraulic oil is filled in the cylinder and the outer connecting shell.

Further, the method comprises the following steps: the piston I is made of stainless steel, and rubber sleeves are sleeved on the outer surfaces of the piston II and the piston III, so that air or hydraulic oil can be prevented from overflowing.

Further, the method comprises the following steps: the cross section of the piston III is in a crescent shape, so that the piston III can be prevented from following.

A prosthetic knee joint includes a rotational adjustment mechanism.

The invention has the beneficial effects that:

1. a return spring with a piston II fixed at the top end is fixed at the inner bottom of a cylinder body, a piston I is arranged in the cylinder body and positioned at the upper part of the piston II, the outer wall of the piston I is in clearance fit with the inner wall of the cylinder body, an outer connecting shell with a rotary seat is fixed at the middle part of the side wall of the cylinder body close to the top surface of the cylinder body, the inner part of the rotary seat is rotatably connected with a shaft rod which penetrates through and extends to the outer part of the rotary seat, the outer end of the shaft rod is clamped and fixed with an adjusting knob, the outer wall of the shaft rod positioned in the rotary seat is sleeved and fixed with a worm, then two pistons III are slidably connected between the inner wall of the outer connecting shell and the outer wall of the cylinder body, threaded sleeves are fixed on the surfaces of the horizontal central planes of the two pistons three-phase outer connecting shell, a bidirectional screw rod is rotatably connected between the two, the worm wheel and the worm are in meshed transmission, so that when a patient adjusts, the rotation of the adjusting knob can be converted into the rotation of the bidirectional screw rod through the meshing of the worm wheel and the worm, and meanwhile, the worm wheel and the worm have a self-locking function, so that the displacement of the piston III caused by the use of the patient is prevented, and the self-locking performance after adjustment and the use experience of the patient are improved;

2. be 0.5mm with the clearance between piston outer wall and the barrel inner wall, and the chamfer has all been seted up to the top side and the bottom side of piston one, make things convenient for the medium flow of barrel through setting up the chamfer, then it is the same with the aperture of opening two and opening one, and the cross sectional area of opening one is less than the area in clearance between piston outer wall and the barrel inner wall, avoid in the accommodation process like this, too big fluid, influence the stability of knee joint, and be 5 times threaded sleeve pipe length with two-way lead screw thread part length, can guarantee like this that piston three has great displacement amount, corresponding control range is more extensive, it is wide to be suitable for the crowd.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of a rotary adjustment mechanism for a prosthetic knee joint according to the present invention;

FIG. 2 is a schematic view of another aspect of the present invention for a rotational adjustment mechanism for a prosthetic knee joint;

FIG. 3 is a front view of the rotational adjustment mechanism of the prosthetic knee joint of the present invention;

FIG. 4 is a sectional view taken along line A-A of FIG. 3 according to the present invention;

FIG. 5 is a schematic structural view of the outer joint shell according to the present invention;

fig. 6 is a schematic structural view of a prosthetic knee joint according to the present invention.

In the figure: 1. a barrel; 101. a first circulation hole; 102. a second circulation hole; 2. a support bar; 3. an outer connecting shell; 301. a rotating base; 4. adjusting a knob; 5. a first piston; 6. a second piston; 7. a return spring; 8. a bidirectional lead screw; 9. a turbine; 10. a worm; 11. a threaded bushing; 12. and a third piston.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, a rotary adjustment mechanism for a prosthetic knee joint comprises a cylinder 1 and a support rod 2, wherein the cylinder 1 is a cylindrical shell structure with a round hole on the top surface, a first rotary seat is fixed at the bottom of the cylinder 1 and is arranged to be conveniently connected with a corresponding knee joint part, a return spring 7 is fixed at the inner bottom of the cylinder 1, a second piston 6 is fixed at the top end of the return spring 7, the second piston 6 is slidably connected with the inner wall of the cylinder 1, a first piston 5 is arranged at the upper part of the second piston 6 inside the cylinder 1, the outer wall of the first piston 5 is in clearance fit with the inner wall of the cylinder 1, when the support rod 2 moves relatively, the internal medium of the cylinder 1 can flow up and down, the support rod 2 is fixed at the center position of the top surface of the first piston 5, the supporting rod 2 penetrates through a round hole in the top surface of the barrel body 1 and extends to the upper part of the barrel body 1, a rotating seat II is fixed at the top end of the supporting rod 2, and the rotating seat II is arranged to be conveniently connected with a corresponding knee joint part;

an outer connecting shell 3 is fixed on the side wall of the cylinder 1 close to the top surface of the cylinder, a rotary seat 301 is fixed in the middle of the side wall of the outer connecting shell 3, a shaft rod penetrating and extending to the outside of the rotary seat 301 is rotatably connected in the rotary seat 301, an adjusting knob 4 is fixed at the outer end of the shaft rod in a clamping manner, so that a patient can drive the shaft rod to rotate through the adjusting knob 4, a worm 10 is fixedly sleeved on the outer wall of the shaft rod in the rotary seat 301, two pistons three 12 are symmetrically and slidably connected between the inner wall of the outer connecting shell 3 and the outer wall of the cylinder 1 about the horizontal central plane of the outer connecting shell 3, threaded sleeves 11 are fixed on the surfaces of the two pistons three 12 relative to the horizontal central plane of the outer connecting shell 3, a bidirectional screw 8 is rotatably connected between the two threaded sleeves 11, a turbine 9 is fixed on the outer wall of the bidirectional screw 8 corresponding to the position of the worm 10, can realize turning into the rotation of two-way lead screw 8 with the rotation of adjust knob 4 through the meshing of turbine 9 and worm 10, turbine 9 has self-locking function with worm 10 simultaneously, prevents that the patient from causing the aversion of piston three 12 when using, and the outer wall that barrel 1 is close to interior top surface and interior bottom surface of outer even shell 3 has seted up flow opening two 102 and flow opening 101 respectively.

The clearance between the outer wall of the first piston 5 and the inner wall of the cylinder body 1 is 0.5mm, chamfers are arranged on the top side and the bottom side of the first piston 5, the medium flowing of the cylinder body 1 is facilitated through the chamfers, the aperture of the second circulation hole 102 is the same as that of the first circulation hole 101, and the sectional area of the first circulation hole 101 is smaller than the area of the clearance between the outer wall of the first piston 5 and the inner wall of the cylinder body 1, so that the influence on the stability of the knee joint caused by overlarge fluid in the adjusting process is avoided.

The length of the threaded part of the bidirectional screw rod 8 is 5 times that of the threaded sleeve 11, so that the piston III 12 can be guaranteed to have larger displacement, the corresponding adjusting range is wider, and the application range is wide.

Barrel 1 is fixed with the sealing rubber circle for top surface round hole inner wall embedding, and the sealing rubber circle is interference fit with the outer wall of bracing piece 2, can improve the inside leakproofness of barrel 1 like this, the inside of barrel 1 and the inside packing of outer even shell 3 have air or hydraulic oil, the material of piston one 5 is the stainless steel, the rubber sleeve has all been cup jointed to the surface of piston two 6 and piston three 12, can prevent air or hydraulic oil overflow like this, the cross-sectional profile of piston three 12 is the falcate, can prevent that piston three 12 from taking place to follow and changeing like this.

A return spring 7 with a piston II 6 fixed at the top end is fixed at the inner bottom of a cylinder body 1, a piston I5 is arranged at the upper part of the piston II 6 in the cylinder body 1, the outer wall of the piston I5 is in clearance fit with the inner wall of the cylinder body 1, an outer connecting shell 3 with a rotary seat 301 is fixed at the middle part of the side wall of the cylinder body 1 close to the top surface of the cylinder body, the inner part of the rotary seat 301 is rotatably connected with a shaft rod penetrating and extending to the outer part of the rotary seat 301, the outer end of the shaft rod is fixedly connected with an adjusting knob 4 in a clamping way, a worm 10 is fixedly sleeved on the outer wall of the shaft rod in the rotary seat 301, then two pistons III 12 are slidably connected between the inner wall of the outer connecting shell 3 and the outer wall of the cylinder body 1, threaded sleeves 11 are fixed on the surfaces of the two pistons III 12, which are opposite to the horizontal central plane of the outer connecting, then a worm wheel 9 is fixed on the outer wall of the bidirectional screw 8 at a position corresponding to the worm 10, and the worm wheel 9 is in meshing transmission with the worm 10, so that when a patient adjusts, the rotation of the adjusting knob 4 can be converted into the rotation of the bidirectional screw 8 through the meshing of the worm wheel 9 and the worm 10, meanwhile, the worm wheel 9 and the worm 10 have a self-locking function, the displacement of a piston III 12 caused by the use of the patient is prevented, and the self-locking performance after adjustment and the use experience of the patient are improved;

be 0.5mm with the clearance between 5 outer walls of piston and the barrel 1 inner wall, and the chamfer has all been seted up to the top side and the bottom side of piston 5, make things convenient for the medium of barrel 1 to flow through setting up the chamfer, then it is the same with the aperture of circulation hole two 102 and circulation hole 101, and the cross sectional area of circulation hole one 101 is less than the area in clearance between 5 outer walls of piston and the barrel 1 inner wall, avoid in the accommodation process like this, too big fluid, influence the stability of knee joint, and be 5 times of threaded sleeve 11 length with 8 threaded part lengths of two-way lead screw, can guarantee like this that piston three 12 has great displacement, corresponding control range is more extensive, it is wide to be suitable for the crowd. A prosthetic knee joint, a rotary adjusting mechanism.

The working principle is as follows: when the device is used, the rotary adjusting mechanism is arranged at the position of the damping telescopic rod of the artificial limb knee joint, a patient connects the artificial limb with the cut limb and then is in a standing state, the effect of the rotary adjusting mechanism on buffering and bending is felt through downward bending, and the strength is adjusted according to the use feeling;

when the strength of the rotary adjusting mechanism needs to be enhanced, the patient is operated to positively rotate the adjusting knob 4 to drive the shaft rod connected with the adjusting knob to rotate, the shaft rod drives the worm 10 to be meshed with the turbine 9 in the rotating process, thereby driving the turbine 9 to rotate, the turbine 9 drives the two-way screw 8 connected with the turbine to rotate in the positive direction after rotating, the end part of the two-way screw 8 is screwed with the corresponding threaded sleeve 11, and the piston III 12 connected with the threaded sleeve 11 is limited by the cylinder 1 and the outer connecting shell 3, no follow-up rotation occurs, so that the two pistons three 12 move away from each other, air or hydraulic oil between the cylinder body 1 and the outer connecting shell 3 enters the cylinder body 1 through the corresponding first circulation hole 101 and the second circulation hole 102, the second piston 6 is pressed to extrude the return spring 7, so that the deformation of the return spring 7 is increased, the corresponding buffering and bending resistance capabilities are enhanced, and the use by patients with heavy weight is facilitated;

when the strength of the rotary adjusting mechanism needs to be reduced, the patient is operated to reversely rotate the adjusting knob 4 to drive the shaft rod connected with the adjusting knob to rotate, the shaft rod drives the worm 10 to be meshed with the turbine 9 in the rotating process, thereby driving the turbine 9 to rotate, the turbine 9 drives the two-way screw 8 connected with the turbine to rotate reversely after rotating, the end part of the two-way screw 8 is screwed with the corresponding threaded sleeve 11, and the piston III 12 connected with the threaded sleeve 11 is limited by the cylinder 1 and the outer connecting shell 3, no follow-up rotation occurs, so that the two pistons three 12 move relatively close to each other, air or hydraulic oil in the cylinder 1 enters between the cylinder 1 and the outer connecting shell 3 through the corresponding first circulation hole 101 and the second circulation hole 102, therefore, the extrusion of the second piston 6 to the return spring 7 is reduced, the deformation of the return spring 7 is reduced, the corresponding buffering and bending resistance capabilities are weakened, and the use by a patient with small weight is facilitated.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims

1. A rotary adjusting mechanism of a prosthetic knee joint, which is characterized by comprising a cylinder body (1) and a supporting rod (2), the cylinder body (1) is of a cylindrical shell structure with a round hole formed in the top surface, a first rotating seat is fixed at the bottom of the cylinder body (1), a return spring (7) is fixed at the inner bottom of the cylinder body (1), a second piston (6) is fixed at the top end of the return spring (7), and the second piston (6) is connected with the inner wall of the cylinder body (1) in a sliding way, the first piston (5) is arranged in the cylinder body (1) and positioned at the upper part of the second piston (6), the outer wall of the first piston (5) is in clearance fit with the inner wall of the cylinder body (1), a supporting rod (2) is fixed at the center of the top surface of the first piston (5), the supporting rod (2) penetrates through a round hole in the top surface of the barrel body (1) and extends to the upper part of the barrel body (1), and a second rotating seat is fixed at the top end of the supporting rod (2);

an outer connecting shell (3) is fixed on the side wall of the barrel (1) close to the top surface of the barrel, a rotary seat (301) is fixed in the middle of the side wall of the outer connecting shell (3), a shaft rod penetrating and extending to the outside of the rotary seat (301) is rotatably connected to the inside of the rotary seat (301), an adjusting knob (4) is fixed at the outer end of the shaft rod in a clamping manner, a worm (10) is fixedly sleeved on the outer wall of the shaft rod in the rotary seat (301), two pistons (three) (12) are symmetrically and slidably connected between the inner wall of the outer connecting shell (3) and the outer wall of the barrel (1) about the horizontal central plane of the outer connecting shell (3), threaded sleeves (11) are fixed on the surfaces of the two pistons (three) (12) opposite to the horizontal central plane of the outer connecting shell (3), a bidirectional lead screw (8) is rotatably connected between the two threaded sleeves (11), and a turbine (9) is fixed on the position, corresponding to the worm (10), and the worm wheel (9) is in meshing transmission with the worm (10), and the outer walls of the cylinder body (1) close to the inner top surface and the inner bottom surface of the outer connecting shell (3) are respectively provided with a second circulation hole (102) and a first circulation hole (101).

2. A rotary adjustment mechanism for a prosthetic knee joint according to claim 1, wherein the clearance between the outer wall of the first piston (5) and the inner wall of the barrel (1) is 0.5mm, and the top side and the bottom side of the first piston (5) are chamfered.

3. A rotary adjustment mechanism of a prosthetic knee joint according to claim 1, wherein the diameters of the second flow hole (102) and the first flow hole (101) are the same, and the cross-sectional area of the first flow hole (101) is smaller than the area of the gap between the outer wall of the first piston (5) and the inner wall of the cylinder (1).

4. A rotary adjustment mechanism for a prosthetic knee joint according to claim 1, characterised in that the length of the threaded portion of the bidirectional screw (8) is 5 times the length of the threaded sleeve (11).

5. A rotary adjustment mechanism of a prosthetic knee joint according to claim 1, wherein the cylinder (1) is a sealing rubber ring fixed on the inner wall of the circular hole on the top surface in an embedded manner, and the sealing rubber ring is in interference fit with the outer wall of the support rod (2).

6. A rotary adjustment mechanism for a prosthetic knee joint according to claim 1, characterised in that the interior of the barrel (1) and the interior of the outer joint shell (3) are filled with air or hydraulic oil.

7. A rotary adjustment mechanism of a prosthetic knee joint according to claim 6, wherein the material of the first piston (5) is stainless steel, and rubber sleeves are sleeved on the outer surfaces of the second piston (6) and the third piston (12).

8. A rotary adjustment mechanism for a prosthetic knee joint according to claim 7, characterised in that the cross-sectional profile of said piston three (12) is crescent shaped.

9. A prosthetic knee comprising a rotation adjustment mechanism as claimed in any one of claims 1 to 8.