Prosthetic limb lock

Abstract

The utility model discloses a kind of artificial limb locks, including base, lock bar and control piece, the top end of base is provided with jack, limit cavity that jack is connected is equipped in base, the top wall of limit cavity is equipped with press block in one place deviating jack, limit cavity is respectively equipped with annular card and first elastic member, the side wall of lock bar is evenly distributed with multiple clamping grooves along axial direction, clamping groove is set along the circumference of lock bar, wherein, first elastic member exerts pre-tightening force to card, which is directed to the top wall of elastic pressure cavity, so that the two ends of card are respectively abutted on press block and the top wall of limit cavity, and the included angle between card and the axis of clamping hole is less than 90 degrees;Lock bar can be slidably inserted into jack, so that its end portion extends into limit cavity and is sleeved inside card, so that the inner side wall of card is embedded in corresponding clamping groove, forming the constraint to the axial back of lock bar, control piece is movably arranged on base, for driving card swing, so that its inner side wall is separated from clamping groove.

Description

Technical Field

[0001] This utility model relates to the field of prosthetic connection device technology, and in particular to a prosthetic lock. Background Technology

[0002] In prosthetic systems, the prosthetic locking mechanism, as a key component connecting the residual limb sleeve to the prosthetic body, must simultaneously meet the dual requirements of reliable locking and rapid unlocking. Existing technologies mainly employ two types of prosthetic locking mechanisms:

[0003] The first type uses a gear and rack meshing mechanism, which achieves unidirectional braking of the rack through a one-way bearing built into the gear. This mechanism unlocks by utilizing the axial displacement of the gear and has the advantage of stepless backlash adjustment. However, the gear transmission system requires precision machining, which increases the structural complexity and manufacturing cost.

[0004] The second type uses a conical locking mechanism, which achieves stepped locking through the elastic cooperation between the conical surface of the locking rod and the locking tongue. It has a simple structure and low manufacturing cost.

[0005] However, although the second type of prosthetic locking device has a simple structure and is easy to control production costs, there is often a large gap between the conical surfaces of the locking bar, which makes it easy to feel loose and impactful during wear and use, resulting in poor comfort. Utility Model Content

[0006] In view of this, the present invention provides a prosthetic limb lock to solve the problem that existing tongue-type prosthetic limb locks, due to their large fitting gaps, are prone to looseness and impact during wear and use, resulting in poor comfort.

[0007] To achieve one, some, or all of the above objectives, or other objectives, this utility model proposes a prosthetic limb lock, comprising a base, a locking rod, and a control component. The base has an insertion hole at its top and a limiting cavity within it that connects to the insertion hole. A pressure block is located on the top wall of the limiting cavity, offset from the insertion hole. An annular card and a first elastic element are respectively provided within the limiting cavity. The diameter of the locking rod is smaller than the inner diameter of the card. Multiple slots are evenly distributed along the axial direction on the side wall of the locking rod, with the slots arranged circumferentially along the locking rod. The first elastic element applies a pre-tightening force to the card, pointing towards the top wall of the elastic cavity, causing both ends of the card to abut against the pressure block and the top wall of the limiting cavity, respectively, with the angle between the card and the axis of the insertion hole being less than 90 degrees. The locking rod is slidably inserted into the insertion hole, with its end extending into the limiting cavity and fitting inside the card, causing the inner wall of the card to embed into the corresponding slot, thus constraining the axial retraction of the locking rod. The control component is movably mounted on the base and is used to drive the card to swing, causing its inner wall to disengage from the slot.

[0008] Preferably, a sliding hole is provided on one side wall of the base, which penetrates the side wall of the limiting cavity. An avoidance notch is provided on the top edge of the limiting cavity to connect to the sliding hole. The control component includes a spindle, which is slidably connected in the sliding hole. Its inner end is provided with an inclined surface, and its outer end extends to the outside of the sliding hole. Pressing the outer end of the spindle can drive the inner end of the spindle to slide into the avoidance notch, so that the inclined surface of its inner end slides and squeezes the upper side wall of the card end, forcing the card to swing downward and disengage its inner side wall from the card slot.

[0009] Preferably, the side wall of the base is further provided with a spring-loaded cavity with a connecting sliding hole, and the control component further includes a second elastic element, which is disposed in the spring-loaded cavity and is used to drive the inner end of the mandrel to slide away from the card.

[0010] Preferably, the base has a limiting groove at the inner edge of the sliding hole, and the mandrel has a limiting block on the inner circumference. The limiting block is slidably connected to the limiting groove to constrain the mandrel from axially exiting the sliding hole.

[0011] Preferably, the control component further includes a handle, one end of the spring-loaded cavity passes through the side wall of the base, the handle is coaxially fixed on the outer end of the spindle and slidably connected in the spring-loaded cavity, one end of the second elastic element is connected to the inner wall of the spring-loaded cavity, and the other end is connected to the inner end of the handle.

[0012] Preferably, the base includes a lock body, a pressure cylinder, and a sleeve. The lock body has a first nested cavity opening towards its top and a second nested cavity with one end connected to the first nested cavity and the other end penetrating through the side wall of the lock body. Both the pressure cylinder and the sleeve are hollow structures with both ends penetrating through. The pressure cylinder is fixedly sleeved in the first nested cavity, and the inner cavity of the pressure cylinder forms an insertion hole. The bottom wall of the pressure cylinder is spaced apart from the bottom wall of the first nested cavity and forms a limiting cavity. The pressure block and the clearance notch are both provided on the bottom wall of the pressure cylinder. One end of the sleeve is fixedly sleeved in the second nested cavity, and the inner cavity of the sleeve forms a sliding hole. The limiting groove is provided at the inner end of the sleeve, and the spring-loaded cavity is provided at the outer end of the sleeve.

[0013] Preferably, both the first elastic element and the second elastic element are springs. The first elastic element is disposed on the bottom wall of the limiting cavity, one end of the first elastic element is connected to the bottom wall of the limiting cavity, and the other end is connected to the lower side wall of the card. The second elastic element is sleeved on the mandrel.

[0014] Preferably, the inner end of the mandrel is conical, and its sidewalls form an inclined surface.

[0015] Preferably, the upper sidewall of the card has an arc surface, and the inner end slope of the mandrel can be slidably connected to the end of the card through the arc surface transition.

[0016] Preferably, a limiting boss is provided in the middle of the bottom wall of the limiting cavity, and the lower end of the first elastic element is sleeved on the limiting boss.

[0017] Implementing the embodiments of this utility model will have the following beneficial effects:

[0018] Using the aforementioned prosthetic locking device, taking the residual limb as an example, during use, the locking rod is fixedly connected to the bottom end of the rubber sleeve, the top of the base is threadedly connected to the bottom end of the prosthetic receiving sleeve, and the bottom of the base is fixedly connected to the prosthesis. After the rubber sleeve is put on the residual limb, simply insert the residual limb, along with the rubber sleeve and the locking rod, into the receiving sleeve, and insert the locking rod into the insertion hole. Subsequently, as the rubber sleeve gradually embeds into the receiving sleeve, the locking rod will continuously move downwards and pass through the inside of the card. At this time, the inner wall of the card will engage with the corresponding slot on the side wall of the locking rod and be driven by the locking rod to swing downwards until the inner wall of the card disengages from the slot. Then, driven by the first elastic element, it swings upwards to reset and engages with the next slot again. This cycle continues until the rubber sleeve is completely inserted into the receiving sleeve and cannot move. At this time, the inner wall of the card and the corresponding slot... The card engages with its two ends abutting against the top walls of the pressure block and the limiting cavity, respectively. Therefore, the card is relatively fixed in the direction of the locking rod's retraction, constraining its axial retraction and ensuring a stable connection between the receiving sleeve and the rubber sleeve. When the user needs to disassemble the rubber sleeve and receiving sleeve, the card can be swung by the control mechanism, causing its inner wall to disengage from the slot, allowing the locking rod to be pulled out of the insertion hole. Furthermore, as the rubber sleeve is further embedded into the receiving sleeve with the user's walking and stepping, the inner wall of the card can also engage with the corresponding slot in a timely manner, accommodating further engagement of the rubber sleeve and receiving sleeve after wearing. This reduces the gap between the rubber sleeve and the receiving sleeve, minimizing the looseness of the prosthesis during wear. Simultaneously, the tight connection between the slot and the card avoids impact during use, improving comfort. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] in:

[0021] Figure 1 This is an exploded view of the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention.

[0023] In the diagram: 1. Lock body; 11. First nested cavity; 12. Second nested cavity; 13. Limiting cavity; 14. Limiting boss; 2. Pressure cylinder; 21. Insertion hole; 22. Pressure block; 23. Clearance notch; 3. Sleeve; 31. Sliding hole; 32. Spring-loaded cavity; 33. Limiting groove; 4. Locking rod; 41. Slot; 5. Card; 51. Arc surface; 6. First elastic element; 71. Spindle; 711. Inclined surface; 712. Limiting block; 72. Second elastic element; 73. Handle. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] like Figure 1-2As shown, a prosthetic limb lock includes a base, a locking rod 4, and a control component. The top of the base has an insertion hole 21, and the base contains a limiting cavity 13 that connects to the insertion hole 21. A pressure block 22 is located on the top wall of the limiting cavity 13, offset from the insertion hole 21. An annular card 5 and a first elastic element 6 are respectively provided within the limiting cavity 13. The diameter of the locking rod 4 is smaller than the inner diameter of the card 5. Multiple slots 41 are evenly distributed axially on the side wall of the locking rod 4. In this embodiment, the width of the slots 41 is less than or equal to two millimeters. The slots 41 are arranged circumferentially along the locking rod 4. The first elastic element 6 applies a pre-tightening force to the card 5, pointing towards the top wall of the elastic cavity 32, causing both ends of the card 5 to abut against the pressure block 22 and the limiting cavity 32, respectively. On the top wall of the cavity 13, and the angle between the axis of the card 5 and the card hole is less than 90 degrees; the locking rod 4 can be slidably inserted into the insertion hole 21, so that its end extends into the limiting cavity 13 and is sleeved inside the card 5, so that the inner side wall of the card 5 is embedded in the corresponding card slot 41, forming a constraint on the axial retraction of the locking rod 4. The control component is movably set on the base, used to drive the card 5 to swing, so that its inner side wall is disengaged from the card slot 41. Taking the residual limb as an example, when in use, the locking rod 4 is fixedly connected to the bottom end of the rubber sleeve, the top of the base is threadedly connected to the bottom end of the prosthesis receiving sleeve, and the bottom of the base is fixedly connected to the prosthesis. When the rubber sleeve is worn on the residual limb, simply insert the residual limb together with the rubber sleeve and the locking rod 4 into the receiving sleeve, and... The locking rod 4 is inserted into the insertion hole 21. As the rubber sleeve gradually embeds into the receiving sleeve, the locking rod 4 will continuously move downwards and pass through the inside of the card 5. At this time, the inner wall of the card 5 will engage with the corresponding slot 41 on the side wall of the locking rod 4, and will be driven by the locking rod 4 to swing downwards until the inner wall of the card 5 disengages from the slot 41. Then, driven by the first elastic element 6, it will swing upwards to reset and engage with the next slot 41 again. This cycle continues until the rubber sleeve is completely inserted into the receiving sleeve and cannot move. At this time, the inner wall of the card 5 engages with the corresponding slot 41, and both ends of the card 5 abut against the top walls of the pressure block 22 and the limiting cavity 13, respectively. Therefore, the card 5 is relatively fixed in the direction of the locking rod 4's retraction. The axial retraction of 4 forms a constraint, which can ensure a stable connection between the receiving sleeve and the rubber sleeve. When the user needs to disassemble and separate the rubber sleeve and the receiving sleeve, the control component can drive the card 5 to swing, so that its inner sidewall is disengaged from the slot 41, and the locking rod 4 can be pulled out from the insertion hole 21. When the rubber sleeve is further embedded into the receiving sleeve as the user walks and steps, the inner sidewall of the card 5 can also engage with the corresponding slot 41 in time to accommodate the further engagement of the rubber sleeve and the receiving sleeve after wearing. This helps to reduce the gap between the rubber sleeve and the receiving sleeve, reduce the looseness when wearing the prosthesis, and at the same time, the tight connection between the slot 41 and the card 5 also avoids the impact feeling during use, improving the comfort of use.

[0028] In one embodiment, the control element may be a swing arm disposed on one side of the base, with the middle part of the swing arm hinged to the base, one end of the swing arm abutting against the upper side wall of the card 5, and the other end of the swing arm extending to the outside of the base. The user can drive the swing arm to swing by pressing the extended end of the swing arm, and use the swing arm to press down on the card 5 to separate its inner side wall from the card slot 41 (not shown in the figure).

[0029] Furthermore, a sliding hole 31 is provided on one side wall of the base, which passes through the side wall of the limiting cavity 13. A clearance notch 23 is provided on the top edge of the limiting cavity 13 to connect to the sliding hole 31. The control component includes a spindle 71, which is slidably connected in the sliding hole 31. Its inner end is provided with a bevel 711, and its outer end extends to the outside of the sliding hole 31. Pressing the outer end of the spindle 71 can drive the inner end of the spindle 71 to slide into the clearance notch 23. The bevel 711 is used to slide and squeeze the upper side wall of the end of the card 5, forcing the card 5 to swing downward and disengage its inner side wall from the card slot 41 so that the locking rod 4 can be pulled out from the insertion hole 21.

[0030] Furthermore, a spring-loaded cavity 32 with a connecting sliding hole 31 is also provided on the side wall of the base. The control component also includes a second elastic element 72, which is disposed in the spring-loaded cavity 32 and is used to drive the inner end of the spindle 71 to slide away from the card 5, help the spindle 71 to reset, so as to release the effect of the inclined surface 711 on the card 5 and ensure that the card 5 remains in the limiting state of the locking rod 4.

[0031] Furthermore, the base is provided with a limiting groove 33 on the inner edge of the sliding hole 31, and a limiting block 712 is provided on the inner periphery of the spindle 71. The limiting block 712 is slidably connected with the limiting groove 33 to form a constraint on the spindle 71 to axially exit the sliding hole 31, which helps the spindle 71 to position the retraction position and at the same time prevents the spindle 71 from easily disengaging from the sliding hole 31.

[0032] Furthermore, the control component also includes a handle 73. One end of the spring-loaded cavity 32 passes through the side wall of the base. The handle 73 is coaxially fixed on the outer end of the spindle 71 and slidably connected in the spring-loaded cavity 32. One end of the second elastic element 72 is connected to the inner wall of the spring-loaded cavity 32, and the other end is connected to the inner end of the handle 73. The user can push the spindle 71 to slide in the direction of the card 5 by pressing the handle 73. When the user releases the control of the handle 73, the second elastic element 72 will release energy and reset, pushing the handle 73 to drive the spindle 71 to reset and slide.

[0033] Furthermore, the base includes a lock body 1, a pressure cylinder 2, and a sleeve 3. The lock body 1 has a first nested cavity 11 that opens towards its top end, and a second nested cavity 12 that connects to the first nested cavity 11 at one end and penetrates the side wall of the lock body 1 at the other end. Both the pressure cylinder 2 and the sleeve 3 are hollow structures with both ends penetrating through. The pressure cylinder 2 is fixedly fitted inside the first nested cavity 11, and the inner cavity of the pressure cylinder 2 forms an insertion hole 21. The bottom wall of the pressure cylinder 2 is spaced from the bottom wall of the first nested cavity 11 and forms a limiting cavity 13. The pressure block 22 and the clearance notch 23 are both provided on the bottom wall of the pressure cylinder 2. One end of the sleeve 3 is fixedly fitted inside the second nested cavity 12, and the inner cavity of the sleeve 3 forms a sliding hole 31. The limiting groove 33 is provided at the inner end of the sleeve 3, and the spring pressure cavity 32 is provided at the outer end of the sleeve 3. Disassembling the base into multiple parts facilitates separate processing and reassembly, reducing production costs.

[0034] Furthermore, both the first elastic element 6 and the second elastic element 72 are springs. The first elastic element 6 is disposed on the bottom wall of the limiting cavity 13. One end of the first elastic element 6 is connected to the bottom wall of the limiting cavity 13, and the other end is connected to the lower side wall of the card 5. The second elastic element 72 is sleeved on the spindle 71.

[0035] Furthermore, the inner end of the mandrel 71 is conical, and its sidewalls form an inclined surface 711.

[0036] Furthermore, the upper sidewall of the card 5 is provided with an arc surface 51, and the inner end inclined surface 711 of the spindle 71 can be slidably connected to the end of the card 5 through the arc surface 51, so that the transmission between the spindle 71 and the card 5 is smoother.

[0037] Furthermore, a limiting boss 14 is provided in the middle of the bottom wall of the limiting cavity 13, and the lower end of the first elastic member 6 is sleeved on the limiting boss 14 so as to assist the first elastic member 6 in positioning within the limiting cavity 13 through the limiting boss 14.

[0038] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A prosthetic limb locking device, characterized in that, include: The base has an insertion hole at its top and a limiting cavity inside the base that connects to the insertion hole. A pressure block is provided on the top wall of the limiting cavity at a location offset from the insertion hole. A ring-shaped card and a first elastic element are respectively provided inside the limiting cavity. A locking rod, the diameter of which is smaller than the inner diameter of the card, and multiple slots are evenly distributed along the axial direction on the side wall of the locking rod, the slots being arranged along the circumference of the locking rod; The first elastic element applies a pre-tightening force to the card pointing towards the top wall of the compression chamber, so that both ends of the card abut against the top walls of the pressure block and the limiting cavity, respectively, and the included angle between the axis of the card and the card hole is less than 90 degrees; the locking rod can be slidably inserted into the insertion hole, so that its end extends into the limiting cavity and passes through the inside of the card, so that the inner side wall of the card is embedded in the corresponding card groove, forming a constraint on the axial retraction of the locking rod; A control element, movably mounted on the base, is used to drive the card to swing, causing its inner sidewall to disengage from the card slot.

2. The prosthetic limb lock according to claim 1, characterized in that, A sliding hole is provided on one side wall of the base, which penetrates the side wall of the limiting cavity, and an avoidance notch is provided on the top edge of the limiting cavity to connect to the sliding hole. The control component includes a spindle that is slidably connected in a sliding hole. Its inner end has an inclined surface, and its outer end extends out of the sliding hole. Pressing the outer end of the spindle can drive the inner end of the spindle to slide into the clearance notch, so that the inclined surface of its inner end slides and presses the upper side wall of the card end, forcing the card to swing downward and disengage its inner side wall from the card slot.

3. A prosthetic limb lock according to claim 2, characterized in that, The base also has a spring-loaded cavity with a connecting sliding hole on its side wall; The control element also includes a second elastic element, which is disposed in the spring-loaded cavity and is used to drive the inner end of the mandrel to slide away from the card.

4. A prosthetic limb lock according to claim 3, characterized in that, The base has a limiting groove on the inner edge of the sliding hole, and the mandrel has a limiting block on the inner circumference. The limiting block is slidably connected to the limiting groove to constrain the mandrel from axially exiting the sliding hole.

5. A prosthetic limb lock according to claim 4, characterized in that, The control component also includes a handle. One end of the spring-loaded cavity passes through the side wall of the base. The handle is coaxially fixed on the outer end of the spindle and slidably connected inside the spring-loaded cavity. One end of the second elastic element is connected to the inner wall of the spring-loaded cavity, and the other end is connected to the inner end of the handle.

6. A prosthetic limb lock according to claim 5, characterized in that, The base includes a lock body, a pressure cylinder, and a sleeve; The lock body has a first nested cavity that opens toward its top, and a second nested cavity that connects to the first nested cavity at one end and penetrates the side wall of the lock body at the other end. Both the pressure cylinder and the sleeve are hollow structures with open ends. The pressure cylinder is fixedly fitted inside the first nested cavity. The inner cavity of the pressure cylinder forms an insertion hole. The bottom wall of the pressure cylinder is spaced apart from the bottom wall of the first nested cavity and forms a limiting cavity. The pressure block and the clearance notch are both provided on the bottom wall of the pressure cylinder. One end of the sleeve is fixedly fitted inside the second nested cavity. The inner cavity of the sleeve forms a sliding hole. The limiting groove is provided at the inner end of the sleeve. The spring-loaded cavity is provided at the outer end of the sleeve.

7. A prosthetic limb lock according to claim 5, characterized in that, Both the first elastic element and the second elastic element are springs. The first elastic element is disposed on the bottom wall of the limiting cavity. One end of the first elastic element is connected to the bottom wall of the limiting cavity, and the other end is connected to the lower side wall of the card. The second elastic element is sleeved on the spindle.

8. A prosthetic limb lock according to claim 2, characterized in that, The inner end of the mandrel is conical, and its sidewalls form an inclined surface.

9. A prosthetic limb lock according to claim 2, characterized in that, The card has an arc surface around its upper side wall, and the inner end slope of the mandrel can be slidably connected to the end of the card through the arc surface transition.

10. A prosthetic limb lock according to claim 7, characterized in that, The bottom wall of the limiting cavity is provided with a limiting boss in the middle, and the lower end of the first elastic element is sleeved on the limiting boss.

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