Hydraulic assembly of artificial limb

Abstract

The hydraulic assembly comprises a cylinder body, a sliding rod, a noise reduction sleeve and a spring, an oil cavity with an opening facing one end of the cylinder body is formed in the cylinder body, an annular groove is formed in the position, at the opening of the oil cavity, of the cylinder body, the annular groove and the oil cavity are coaxial, the bottom end of the sliding rod is slidably connected into the oil cavity of the cylinder body in a sleeved mode, and the noise reduction sleeve is fixedly arranged at the top end of the sliding rod in a sleeved mode. The sliding rod is movably sleeved with the spring, the noise reduction sleeve is sleeved with the top end of the spring, the inner wall of the annular groove is sleeved with the bottom end of the spring, in the sliding and deforming process of the sliding rod, the noise reduction sleeve blocks the top end of the spring from the top end of the sliding rod, the inner wall of the annular groove blocks the bottom end of the spring from the bottom end of the sliding rod, and the inner side wall of the spring and the sliding rod are spaced. Therefore, friction between the spring and the sliding rod in the deformation process is avoided, and the purpose of reducing friction noise is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a hydraulic component of a prosthesis. Background Art

[0002] Hydraulic technology is used more and more widely in prosthetic joints, and return springs are necessary parts of prosthetic joints, so installing return springs on the piston rod of hydraulic cylinders has become a common combination. It has many advantages such as small size, high system integration, economic reliability, and strong versatility. The adoption of this structure has greatly reduced the difficulty of designing and manufacturing hydraulic prosthetic joints, and has become an important factor in significantly reducing the cost of hydraulic prosthetic joints and promoting the product on a large scale.

[0003] However, this structure has a big problem, that is, there is direct contact between the spring and the piston rod. During the deformation process, the spring will rub against the piston rod to produce noise, and this highly periodic noise will have a great impact on the patient's normal life. Utility Model Content

[0004] In view of this, the utility model provides a hydraulic assembly for a prosthesis, which is used to solve the problem that the spring and the piston rod of the hydraulic assembly of the prosthesis in the prior art are in direct contact, and the spring will rub against the piston rod to produce noise during the deformation process. This highly periodic noise will have a great impact on the patient's normal life.

[0005] In order to achieve one or part or all of the above-mentioned purposes or other purposes, the utility model proposes a hydraulic assembly of a prosthesis, including a cylinder body, a sliding rod, a noise reduction sleeve and a spring, the cylinder body is provided with an oil chamber opening toward one end thereof, the cylinder body is provided with an annular groove at the opening of the oil chamber, the annular groove is coaxial with the oil chamber, the bottom end of the sliding rod is slidably sleeved in the oil chamber of the cylinder body, the noise reduction sleeve is fixedly sleeved on the top end of the sliding rod, the spring is movably sleeved on the sliding rod, the top end of the spring is sleeved on the noise reduction sleeve, and the bottom end of the spring is sleeved on the inner wall of the annular groove.

[0006] Preferably, an abutment portion is provided at the top end of the slide rod, the diameter of the abutment portion is larger than the diameter of the slide rod, one end of the spring abuts against the bottom end of the abutment portion, the other end of the spring abuts against the cylinder body, and the top end of the noise reduction sleeve abuts against the bottom end of the abutment portion.

[0007] Preferably, a flange is provided on the outer edge of the top end of the noise reduction sleeve along the circumferential direction, the upper side wall of the flange abuts against the bottom end of the abutting portion, and the top end of the spring abuts against the lower side wall of the flange.

[0008] Preferably, the spring is a conical spring, the diameter of which gradually decreases from the bottom end to the top end.

[0009] Preferably, a cylinder cover is detachably provided at the end of the cylinder body, and the cylinder cover is used to cover the opening of the oil chamber. The bottom end of the sliding rod passes through the cylinder cover into the oil chamber and is slidably connected to the cylinder cover. The annular groove is arranged on the outer side wall of the cylinder cover.

[0010] Preferably, a connecting hole is provided on the abutting portion along a vertical direction of the sliding rod.

[0011] Preferably, the noise reduction sleeve is made of cushioning material.

[0012] Preferably, the noise reduction sleeve is made of engineering plastic.

[0013] Preferably, a hinge ear is provided at one end of the cylinder body away from the slide rod.

[0014] Preferably, a piston is provided at the bottom end of the sliding rod, and the piston is slidably connected to the inner wall of the oil chamber and divides the oil chamber into an upper chamber and a lower chamber. The cylinder body is also respectively provided with an extension throttle valve and a knee throttle valve connecting the upper chamber and the lower chamber. The extension throttle valve and the knee throttle valve are both one-way valves and have opposite flow directions.

[0015] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0016] After adopting the above-mentioned hydraulic assembly of the prosthesis, when the top end of the slide rod is subjected to pressure, the slide rod will slide back into the cylinder body, the top end of the slide rod will drive the spring to compress, and the bottom end of the slide rod will push the oil in the cylinder body to flow in one direction. When the external force acting on the top end of the slide rod disappears, the spring will release energy and reset, and drive the slide rod to slide in the direction away from the cylinder body, and the bottom end of the slide rod will push the oil in the cylinder body to flow in the other direction. In this process, the noise reduction sleeve will block the top end of the spring and the top end of the slide rod, and the inner wall of the annular groove will block the bottom end of the spring and the bottom end of the slide rod, so that the inner side wall of the spring is spaced from the slide rod, thereby avoiding friction between the spring and the slide rod during deformation, and limiting the friction range of the spring to within the length range of the noise reduction sleeve, thereby achieving the purpose of reducing friction noise and avoiding excessive noise affecting the patient's normal life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] in:

[0019] Figure 1 It is an exploded view of the utility model;

[0020] Figure 2 It is a side view of the utility model;

[0021] Figure 3 It is a side sectional view of the utility model.

[0022] In the figure: 1. cylinder body; 11. oil chamber; 2. slide rod; 21. abutment portion; 22. connecting hole; 23. hinge ear; 3. spring; 4. noise reduction sleeve; 41. flange; 5. cylinder head; 51. ring groove; 6. piston; 7. extension throttle valve; 8. knee throttle valve. DETAILED DESCRIPTION

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] like Figure 1-3As shown, a hydraulic assembly of a prosthesis includes a cylinder body 1, a slide rod 2, a noise reduction sleeve 4 and a spring 3. The cylinder body 1 is provided with an oil chamber 11 which is open to one end thereof. The cylinder body 1 is provided with an annular groove 51 at the opening of the oil chamber 11. The annular groove 51 is coaxial with the oil chamber 11. The bottom end of the slide rod 2 can be slidably sleeved in the oil chamber 11 of the cylinder body 1. The noise reduction sleeve 4 is fixedly sleeved on the top end of the slide rod 2. The spring 3 can be movably sleeved on the slide rod 2. The top end of the spring 3 is sleeved on the noise reduction sleeve 4. The bottom end of the spring 3 is sleeved on the inner wall of the annular groove 51. When the top end of the slide rod 2 is subjected to pressure, the slide rod 2 will slide back into the cylinder body 1, the top end of the slide rod 2 will drive the spring 3 to compress, and the bottom end of the slide rod 2 will push the cylinder body 1. The oil in the cylinder 1 flows in one direction, and when the external force acting on the top of the slide rod 2 disappears, the spring 3 will release energy and reset, and drive the slide rod 2 to slide away from the cylinder 1, and the bottom end of the slide rod 2 will push the oil in the cylinder 1 to flow in the other direction. In this process, the noise reduction sleeve 4 will block the top of the spring 3 and the top of the slide rod 2, and the inner wall of the annular groove 51 will block the bottom end of the spring 3 and the bottom end of the slide rod 2, so that the inner wall of the spring 3 is spaced from the slide rod 2, thereby avoiding the friction between the spring 3 and the slide rod 2 during the deformation process, and limiting the friction range of the spring 3 within the length range of the noise reduction sleeve 4, so as to achieve the purpose of reducing friction noise and avoid excessive noise affecting the normal life of patients.

[0027] Furthermore, an abutment portion 21 is provided at the top end of the slide rod 2, the diameter of the abutment portion 21 is larger than the diameter of the slide rod 2, one end of the spring 3 abuts against the bottom end of the abutment portion 21, the other end of the spring 3 abuts against the cylinder body 1, and the top end of the noise reduction sleeve 4 abuts against the bottom end of the abutment portion 21. When the top end of the slide rod 2 is squeezed by external force, the abutment portion 21 will synchronously press down the spring 3, driving the spring 3 to deform and store energy.

[0028] Furthermore, a flange 41 is provided on the outer edge of the top end of the noise reduction sleeve 4 in the circumferential direction, the upper side wall of the flange 41 abuts against the bottom end of the abutting portion 21, and the top of the spring 3 abuts against the lower side wall of the flange 41. In the present embodiment, the surface accuracy of the noise reduction sleeve 4 is higher than that of the slide bar 2. When the abutting portion 21 slides with the slide bar 2, the flange 41 can replace the abutting portion 21 to rub against the end of the spring 3, thereby reducing the generation of noise.

[0029] Furthermore, the spring 3 is a conical spring, and its diameter gradually decreases from the bottom end to the top end. The conical spring is not prone to deflection when subjected to axial pressure, which can further prevent the spring 3 from contacting the slide rod 2.

[0030] Furthermore, a cylinder cover 5 is detachably provided at the end of the cylinder body 1, and the cylinder cover 5 is used to cover the opening of the oil chamber 11. The bottom end of the slide rod 2 passes through the cylinder cover 5 to the oil chamber 11 and is slidably connected to the cylinder cover 5. An annular groove 51 is provided on the outer wall of the cylinder cover 5 to reduce the difficulty of assembling the slide rod 2 and the cylinder body 1.

[0031] Furthermore, a connecting hole 22 is provided on the abutting portion 21 along a vertical direction of the sliding rod 2 , so that the abutting portion 21 can be hinged to other components through the connecting hole 22 .

[0032] Furthermore, the noise reduction sleeve 4 is a buffer material, which may be a metal or plastic with a certain deformation ability, so as to absorb the impact of the spring 3 during the deformation of the spring 3 and further reduce the noise.

[0033] Furthermore, the noise reduction sleeve 4 is made of engineering plastics, such as ABS plastics.

[0034] Furthermore, a hinge ear 23 is provided at one end of the cylinder body 1 away from the slide rod 2 so that the cylinder body 1 can be hinged to other components.

[0035] Furthermore, a piston 6 is provided at the bottom end of the slide rod 2, and the piston 6 is slidably connected to the inner wall of the oil chamber 11 and divides the oil chamber 11 into an upper chamber and a lower chamber. The cylinder body 1 is also respectively provided with an extension throttle valve 7 and a knee flexion throttle valve 8 connecting the upper chamber and the lower chamber. The extension throttle valve 7 and the knee flexion throttle valve 8 are both one-way valves and have opposite flow directions. When the top end of the slide rod 2 is subjected to pressure, the piston 6 will move downward synchronously with the slide rod 2, and press the oil in the lower chamber into the upper chamber through the knee flexion throttle valve 8. At this time, the space in the lower chamber gradually shrinks, and the space in the upper chamber gradually increases. When the external force disappears, the spring 3 will drive the slide rod 2 to drive the piston 6 to slide upward, and press the oil in the upper chamber into the lower chamber through the extension throttle valve 7. At this time, the space in the lower chamber gradually increases, and the space in the upper chamber gradually shrinks. In this way, the user only needs to adjust the flow rate of the extension throttle valve 7 and the knee flexion throttle valve 8 to change the speed of the up and down sliding of the piston 6, thereby achieving the effect of adjusting the sensitivity of the prosthetic joint.

[0036] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A hydraulic assembly for a prosthesis, characterized in that: include: Cylinder block, slide rod, noise reduction sleeve and spring; The cylinder body is provided with an oil chamber opening toward one end thereof, and the cylinder body is provided with an annular groove at the opening of the oil chamber, and the annular groove is coaxial with the oil chamber; The bottom end of the slide rod is slidably sleeved in the oil chamber of the cylinder body; The noise reduction sleeve is fixedly mounted on the top of the slide bar; The spring is movably sleeved on the slide rod, the top end of the spring is sleeved on the noise reduction sleeve, and the bottom end of the spring is sleeved on the inner wall of the annular groove.

2. A hydraulic assembly for a prosthesis according to claim 1, characterized in that: The top end of the slide rod is provided with an abutment portion, the diameter of the abutment portion is larger than the diameter of the slide rod, one end of the spring abuts against the bottom end of the abutment portion, the other end of the spring abuts against the cylinder body, and the top end of the noise reduction sleeve abuts against the bottom end of the abutment portion.

3. A hydraulic assembly for a prosthesis according to claim 2, characterized in that: The outer edge of the top end of the noise reduction sleeve is provided with a flange along the circumferential direction, the upper side wall of the flange abuts against the bottom end of the abutting portion, and the top end of the spring abuts against the lower side wall of the flange.

4. The hydraulic assembly of a prosthesis according to claim 1, characterized in that: The spring is a conical spring, the diameter of which gradually decreases from the bottom end to the top end.

5. The hydraulic assembly of a prosthesis according to claim 1, characterized in that: A cylinder cover is detachably provided at the end of the cylinder body, and the cylinder cover is used to cover the opening of the oil chamber. The bottom end of the slide rod passes through the cylinder cover into the oil chamber and is slidably connected to the cylinder cover. The annular groove is arranged on the outer side wall of the cylinder cover.

6. The hydraulic assembly of a prosthesis according to claim 2, characterized in that: A connecting hole is provided on the abutting portion along the vertical direction of the sliding rod.

7. The hydraulic assembly of a prosthesis according to claim 1, characterized in that: The noise reduction sleeve is made of cushioning material.

8. The hydraulic assembly of a prosthesis according to claim 7, characterized in that: The noise reduction sleeve is made of engineering plastic.

9. The hydraulic assembly of a prosthesis according to claim 1, characterized in that: A hinge ear is arranged at one end of the cylinder body away from the slide rod.

10. The hydraulic assembly of a prosthesis according to claim 1, characterized in that: A piston is provided at the bottom end of the sliding rod, and the piston is slidably connected to the inner wall of the oil chamber and divides the oil chamber into an upper chamber and a lower chamber. The cylinder body is also respectively provided with an extension throttle valve and a knee throttle valve connecting the upper chamber and the lower chamber. The extension throttle valve and the knee throttle valve are both one-way valves and have opposite flow directions.

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