CN211332680U - Clamp - Google Patents

Abstract

The utility model relates to an anchor clamps for the medical work piece that the clamping has the fixed column, it is right to realize the processing of medical work piece. The jig includes: a base; the elastic clamping sleeve is arranged on the base and is provided with a first inner cavity for accommodating the fixing column; the pushing piece is provided with a second inner cavity for accommodating the elastic jacket, and the pushing piece is configured to press the elastic jacket through the cavity wall of the second inner cavity to enable the first inner cavity to contract so as to clamp the fixing column; and the locking piece is respectively connected with the pushing piece and the base so as to lock the relative positions of the pushing piece and the elastic jacket. The clamp has the characteristics of convenience in use and stable clamping, is beneficial to improving the processing precision and the processing efficiency of the medical workpiece, and ensures the safety in the processing process.

Description

Clamp

Technical Field

The utility model belongs to the technical field of machining, concretely relates to anchor clamps for the clamping has the medical work piece of fixed column.

Background

Currently, artificial knee joint prostheses are mainly classified into femoral condyle prostheses and tibial plateau prostheses. The basic structure of the femoral condyle prosthesis is shown in fig. 1. Specifically, the femoral condyle prosthesis comprises a first surface 11 and a second surface 12 which are opposite, wherein the first surface 11 is a convex joint surface and is used for being contacted with and moving relative to the artificial meniscus component, the second surface 12 is provided with a fixing column 13, and the second surface 12 is connected with the cut femoral end under the cooperation of the fixing column 13. Since the first surface 11 needs to be in contact with the artificial meniscus component and to generate a relative movement, the first surface 11 is required to have a high smoothness. For this reason, it is necessary to polish the femoral condyle prosthesis after it is formed to improve the smoothness of the first surface 11.

However, the polishing process (i.e. manual polishing) generally performed by manually holding the femoral condyle prosthesis has the following problems:

1. the product is unbalanced in stress due to unstable holding, so that the surface processing error and scrapping of the product are easily caused, and even the product flies out to hurt people;

2. the polishing position of the product is uncertain due to inaccurate positioning, and the range of the appearance size interval of the product is large;

3. the efficiency is low;

4. a large amount of dust is generated in the polishing process, which is not good for the health of operators.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anchor clamps for the clamping has the medical work piece of fixed column (for example thighbone condyle false body) in the course of working, so that carry out machining operations such as automatic polishing to this type of medical work piece, improve the processingquality and the machining efficiency of medical work piece, and alleviate artifical intensity of labour, avoid the personal safety risk.

In order to achieve the above object, the utility model provides a pair of anchor clamps for the medical work piece that the clamping has the fixed column, it is right to realize the processing of medical work piece, its characterized in that, anchor clamps include:

a base;

the elastic clamping sleeve is arranged on the base and is provided with a first inner cavity for accommodating the fixing column;

the pushing piece is provided with a second inner cavity for accommodating the elastic jacket, and the pushing piece is configured to press the elastic jacket through the cavity wall of the second inner cavity to enable the first inner cavity to contract so as to clamp the fixing column; and

the locking piece is connected with the pushing piece and the base respectively to lock the relative positions of the pushing piece and the elastic jacket.

Optionally, the second lumen has opposing first and second ends, the first end forms an opening, and the cross-sectional dimension of the second lumen decreases from the first end to the second end.

Optionally, the cross-sectional dimension of the second lumen decreases from the first end to the second end to form a tapered structure.

Optionally, the shape of the elastic jacket matches the second lumen; the elastic jacket is provided with a third end and a fourth end which are opposite, the cross-sectional dimension of the elastic jacket is reduced from the third end to the fourth end, and the fourth end of the elastic jacket is used for being inserted into the second inner cavity.

Optionally, at least a portion of the wall of the first lumen is roughened.

Optionally, at least a part of the wall of the first inner cavity is provided with a carborundum plating layer to form the rough surface.

Optionally, the fixing device further comprises a cover plate, the cover plate is arranged on the base, a first through hole is formed in the cover plate, a second through hole communicated with the first through hole is formed in the base, the elastic clamping sleeve is arranged in the second through hole, the first inner cavity is communicated with the first through hole and the second through hole at the same time, the fixing column is inserted into the first inner cavity through the first through hole, and a gap exists between the elastic clamping sleeve and the hole wall of the second through hole.

Optionally, the surface of the cover plate facing the medical workpiece is at least partially matched with the surface of the medical workpiece on which the fixing posts are arranged.

Optionally, the locking member is configured to connect the abutting member, the base, and the cover plate, so as to lock the elastic jacket and the abutting member, and maintain the clamp in the locked state.

Optionally, the retaining member is a threaded connector.

Optionally, the clamp further comprises:

the locating part, the locating part sets up in the one end of retaining member for the restriction the retaining member breaks away from support the piece and reach the base, the locating part still is equipped with and is used for the operation the third through-hole of retaining member, the aperture of third through-hole is less than the connection of retaining member the diameter of locating part one end.

Optionally, anchor clamps still include the fixed arm, the fixed arm sets up on the base, the fixed arm deviates from the one end of base is provided with the fixed block, just the fixed arm passes through the fixed block is connected with external mechanism.

Compared with the prior art, the utility model discloses an anchor clamps have following advantage:

in the above-mentioned clamp, when the fixing post of the medical workpiece, especially the fixing post of the femoral condyle prosthesis, is accommodated in the first inner cavity of the elastic jacket, and the elastic jacket is accommodated in the second inner cavity of the pushing member, the elastic jacket can press the fixing post by the cavity wall of the second inner cavity of the pushing member, and at this time, the locking member locks the pushing member and the elastic jacket, so that the clamp maintains a locked state. Therefore, the elastic jacket is pressed by the second inner cavity of the pushing piece to clamp the fixing column, so that automatic processing, such as automatic polishing and other machining processing, can be conveniently carried out on the medical workpiece, the medical workpiece does not need to be manually held, the stress on the medical workpiece is balanced under the condition of ensuring the operation safety, and the processing quality and the processing efficiency are improved.

Drawings

FIG. 1 is a schematic structural view of a prior art femoral condyle prosthesis;

fig. 2 is a schematic view of a clip according to an embodiment of the present invention in a first orientation, the clip being shown in a locked position;

FIG. 3 is a schematic view of the fixture of FIG. 2 in a second orientation;

FIG. 4 is a cross-sectional view A-A of the fixture of FIG. 2;

fig. 5 is an enlarged schematic view of the jig B shown in fig. 4.

Detailed Description

To make the objects, advantages and features of the present invention clearer, various embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents, and the plural forms "a plurality" includes "two" and "three or more" referents; unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The same or similar reference numbers in the drawings identify the same or similar elements.

As shown in fig. 2 to 5, the embodiment of the present invention provides a clamp 10, and the clamp 10 is mainly used for clamping a medical workpiece 100 with a fixing column 110, so as to perform mechanical processing such as polishing on the medical workpiece 100. The medical workpiece 100 described herein may be a medical joint prosthesis, such as a femoral condyle prosthesis, but may also be other similar medical workpieces.

Referring to fig. 2 to 5, the clamp 10 includes a base 20, an elastic jacket 30, a pushing member 40 and a locking member 50. The elastic jacket 30 is disposed on the base 20, and the elastic jacket 30 has a first inner cavity 31, and the first inner cavity 31 is used for accommodating the fixing column 110. The pushing member 40 has a second inner cavity 41, and the second inner cavity 41 is used for accommodating the elastic jacket 30.

In practical use, the clamping apparatus 10 has a locking position, in which the fixing post 110 is accommodated in the first inner cavity 31, the elastic jacket 30 is accommodated in the second inner cavity 41, and the cavity wall of the second inner cavity 41 presses the elastic jacket 30, so that the elastic jacket 30 clamps the fixing post 110, and the locking member 50 locks the pushing member 40 and the elastic jacket 30, so that the clamping apparatus 10 is kept in the locking position.

Specifically, the fixing post 110 is first inserted into the first inner cavity 31 of the elastic collet 30, and then the elastic collet 30 is inserted into the second inner cavity 41. The second lumen 41 has opposite first and second ends, the first end forming an opening and the cross-sectional diameter of the second lumen 41 decreasing from the first end to the second end. Preferably, the cross-sectional diameter of the second lumen 41 decreases from the first end to the second end to form a tapered configuration. Therefore, when the elastic collet 30 is inserted into a predetermined position of the second inner cavity 41, the cavity wall of the second inner cavity 41 presses the elastic collet 30, so that the friction force between the elastic collet 30 and the fixing post 110 is increased, and the elastic collet 30 can clamp the fixing post 110. It should be noted that, at the "predetermined position", the diameter of the second inner cavity 41 is smaller than the outer diameter of the elastic jacket 30, so that the two are tightly fitted. Further, the jig 10 with the medical workpiece 100 mounted thereon may be fixed to an external mechanism (e.g., a robot), and then the medical workpiece 100 may be subjected to polishing or the like.

It should be known that the clamp 10 of this embodiment has the advantages of simple structure and convenient use, and the clamp 10 is adopted to clamp the medical workpiece 100, so as to provide balanced and stable clamping force for the medical workpiece 100, ensure the processing quality, and avoid the situation that the medical workpiece 100 flies out to hurt people in the processing process.

In order to further enhance the friction between the elastic clamping sleeve 30 and the fixing post 110, so as to ensure the elastic clamping sleeve 30 to reliably clamp the fixing post 110, a rough surface may be formed on at least a part of the wall of the first inner cavity 31. Optionally, at least a portion of the wall of the first interior cavity 31 may be coated with silicon carbide to form the rough surface. Here, the entire wall of the first inner cavity 31 may be coated with the diamond coating, or a part of the wall of the first inner cavity 31 may be provided with the diamond coating.

It can be understood that, in the embodiment of the present invention, the number of the elastic clamping sleeves 30 in the clamp 10 is the same as that of the second inner cavities 41, and the number of the elastic clamping sleeves 30 can be set according to the number of the fixing posts 110 on the medical workpiece 100 to be processed. For example, when one fixing post 110 is provided on the medical workpiece 100, the number of the elastic clamping sleeves 30 is at least one, and when two fixing posts 110 are provided on the medical workpiece 100, the number of the elastic clamping sleeves 30 is at least two.

Hereinafter, the medical workpiece 100 is provided with two fixing posts 110, and the clamp 10 is provided with two elastic clamping sleeves 30 and two second inner cavities 41. Meanwhile, the arrangement of the two elastic jackets 30 is matched with the arrangement of the two fixing posts 110, and the cross sections of the fixing posts 110, the elastic jackets 30, the first inner cavities 31 and the second inner cavities 41 in the axial direction perpendicular to the jig 10 may be all circular. In addition, in the following description, it is to be understood that the terms "upper", "lower", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used for simplicity of description only, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be taken as limiting the present invention.

In one embodiment, as shown in fig. 4 to 5, the shape of the elastic collet 30 is matched with the second inner cavity 41, and preferably, the elastic collet 30 is designed to have a tapered structure. In detail, the elastic jacket 30 has a third end and a fourth end opposite to each other, the fourth end of the elastic jacket 30 is inserted into the second inner cavity 41, and the third end of the elastic jacket 30 is located outside the second inner cavity 41. In this embodiment, the elastic jacket 30 is vertically arranged, and the cross-sectional dimension of the elastic jacket 30 is gradually reduced from top to bottom. The second inner cavity 41 is also vertically arranged, and from top to bottom, the cross-sectional dimension of the second inner cavity 41 is gradually reduced. That is, in this embodiment, the upper end of the elastic jacket 30 is the third end, and the lower end of the elastic jacket 30 is the fourth end; the upper end of the second inner cavity 41 is the first end, and the lower end of the second inner cavity 41 is the second end.

During the process of inserting the elastic jacket 30 into the second inner cavity 41, the elastic jacket 30 moves from top to bottom along the axial direction of the second inner cavity 41, at this time, the gap between the outer wall of the elastic jacket 30 and the cavity wall of the second inner cavity 41 gradually decreases until the gap disappears, and then the elastic jacket 30 continues to move downward along the axial direction of the second inner cavity 41, at this time, the cavity wall of the second inner cavity 41 starts to squeeze the elastic jacket 30. Preferably, the outer diameter of the lower end of the elastic collet 30 is smaller than the inner diameter of the upper end of the second inner cavity 41, so that the elastic collet 30 is inserted into the second inner cavity 41. It should be understood that, the movement of the elastic clamping sleeve 30 from top to bottom along the axis of the second inner cavity 41 is a relative movement process, and in practice, the pushing element 40 may be kept still and the elastic clamping sleeve 30 moves, the elastic clamping sleeve 30 may be kept still and the pushing element 40 moves, and the pushing element 40 and the elastic clamping sleeve 30 move towards each other at the same time.

Further, the fixture 10 further includes a cover plate 60, two first through holes (not labeled in the drawings) are formed in the cover plate 60, two second through holes (not labeled in the drawings) are formed in the base 20, each of the second through holes is communicated with one of the first through holes, and preferably, the second through holes are coaxially arranged with the corresponding first through holes. When the jig 10 is assembled, the elastic collet 30 is first placed in the second through hole, and then the cover plate 60 is placed on the upper surface of the base 20, and the cover plate 60 is connected to the base 20. That is, each of the elastic jackets 30 is disposed in one of the second through holes, and the first inner cavity 31 of the elastic jacket 30 is simultaneously communicated with the first through hole and the second through hole, and a fixing post for a medical workpiece is inserted into the first inner cavity 31 through the first through hole. The cover plate 60 is provided to prevent the elastic jacket 30 from being removed from the base 20. A gap is formed between the lower end of the elastic jacket 30 and the inner wall of the second through hole, and the pushing part 40 includes two pushing posts 42 and a transition block 43 for connecting the two pushing posts 42. Each of the pushing posts 42 is provided with one of the second inner cavities 41, and the outer diameter of the pushing post 42 is matched with the aperture of the second through hole, so that the pushing post 42 can be inserted into a gap formed between the inner wall of the second through hole and the elastic jacket 30, thereby ensuring that the elastic jacket 30 can be inserted into the second inner cavity 41.

It should be noted that, the fixture 10 may not include the cover plate 60, and the elastic clamping sleeve 30 and the base 20 are fixedly connected by welding, bonding, clamping, or the like, as long as when the pushing element 40 presses the elastic clamping sleeve 30, the elastic clamping sleeve 30 is not separated from the second through hole of the base 20 due to the pressing.

Optionally, the upper surface of the cover plate 60 at least partially matches the surface of the medical workpiece 100 on which the fixing posts 110 are disposed. In this way, when the medical workpiece 100 is mounted on the jig 10, the upper surface of the cover plate 60 can be at least partially attached to the surface of the medical workpiece 100 on which the fixing posts 110 are provided, so that whether the medical workpiece 100 is mounted in place can be easily determined.

After the medical workpiece 100 is mounted on the clamp 10 and the clamp 10 is adjusted to the locking position, the relative positions of the pushing member 40 and the elastic jacket 30 need to be fixed by the locking member 50, so that the clamp 10 can be kept in the locking state, and the medical workpiece 100 can be processed. Alternatively, as shown in fig. 4, the locking member 50 maintains the clamp 10 in the locking position by connecting the pushing member 40, the base 20 and the cover 60. Specifically, the transition block 43 of the pushing element 40 and the base 20 are correspondingly provided with screw holes, the locking element 50 can be a threaded connecting element such as a screw or a bolt, and the locking element 50 is respectively in threaded connection with the pushing element 40, the base 20 and the cover plate 60. In other embodiments, a detachable connection manner such as a snap connection can also be adopted. In the case of a clamp that does not include a cover 60, the retaining member 50 maintains the clamp 10 in the locked position by connecting the push member 40 to the base 20.

When the cavity wall of the second inner cavity 41 does not press the elastic collet 30, or even if the cavity wall of the second inner cavity 41 presses the elastic collet 30, the force applied to the elastic collet 30 is not enough to clamp the fixing post 110, the clamp 10 is no longer in the locking position. Preferably, the clamp 10 further includes a limiting member 70, wherein the limiting member 70 is disposed at one end of the locking member 50 and is used for limiting the locking member 50 to be separated from the abutting member 40 and the base 20, so as to facilitate the use of the clamp, save the operation time, and prevent the locking member 50 from being lost.

Specifically, the limiting member 70 may be a plate, the limiting member 70 is disposed on the lower surface of the transition block 43, and a third through hole (not labeled in the figure) that is communicated with the screw hole on the transition block 43 is disposed on the limiting member 70, and preferably, the third through hole is disposed coaxially with the screw hole. The diameter of the third through hole is smaller than the diameter of the lower end of the locking member 50 to prevent the locking member from being removed. When the clamp 10 is located at the locking position, an operator may screw the locking member 50 through the third through hole by using a tool such as a screwdriver, so that the locking member 50 moves downward to drive the abutting member 40 to move away from the base 20, so that the clamp 10 is no longer located at the locking position, and in this process, the limiting member 70 limits the maximum distance that the locking member 50 moves downward, thereby preventing the locking member 50 from coming off the base 20 and the abutting member 40. In this way, the locking member 50 can always connect the base 20 and the pushing member 40, so that the elastic collet 30 is always located in the second inner cavity 41, and the need to realign the elastic collet 30 with the second inner cavity 41 and insert the elastic collet 30 into the second inner cavity 41 is avoided every time the clamp is used.

The procedure of mounting the medical workpiece 100 on the jig 10 and detaching the medical workpiece 100 from the jig 10 will be described below.

Installing the medical workpiece 100: firstly, the fixing post 110 of the medical workpiece 100 is inserted into the first inner cavity 31 of the elastic jacket 30 until the medical workpiece 100 abuts against the cover plate 60; then, the locking member 50 is screwed down from the third through hole on the retaining member 70 in a predetermined direction (for example, clockwise), and at the same time, the locking member 50 drives the pushing member 40 to move upward so as to make the pushing member 40 approach the base 20, until the cavity wall of the second inner cavity 41 presses the elastic clamping sleeve 30, so that the elastic clamping sleeve 30 clamps the fixing column 110.

Disassembling the medical workpiece 100: screwing the locking member 50 from the third through hole anticlockwise (based on screwing the locking member clockwise when the workpiece is installed), and simultaneously driving the pushing member 40 to move downwards by the locking member 50 so as to enable the pushing member 40 to be far away from the base 20 until the cavity wall of the second inner cavity 41 releases the extrusion on the elastic jacket 30; and then the fixing post 110 is pulled out from the first inner cavity 31.

In addition, after the medical workpiece 100 is mounted on the jig 10, the jig 10 needs to be fixed to an external mechanism such as a robot for performing a processing process such as polishing. Therefore, a fixing arm 80 for connecting with the robot is further provided on the base 20. Preferably, the end of the fixing arm 80 away from the base 20 may further be provided with a fixing block 81. Generally, the robot is provided with a three-jaw chuck, and the robot fixes the jig by the three-jaw chuck. Therefore, in order to accommodate the structure of the three-jaw chuck, the fixing blocks 81 are preferably provided in a regular hexagonal structure. The regular hexagon fixing block 81 and the three-jaw chuck are matched stably and reliably, the self-centering precision can reach 0.01-06mm, and the clamping force of the three-jaw chuck on the fixing block 81 can reach 50Kg, so that the clamp is stable and does not vibrate in the process of operations such as polishing, the stability of the operations such as polishing is improved, and the processing precision of workpieces is improved.

In addition, for example, when polishing operation is performed, the clamp 10 may contact with corrosive substances such as polishing liquid or polishing wax, and therefore, the clamp 10 is preferably made of a corrosion-resistant material, which may be stainless steel, and the stainless steel also has high temperature resistance, which helps to prolong the service life of the clamp 10. Stainless steel as used herein includes, but is not limited to, 316 stainless steel, 630 stainless steel, 304 stainless steel, or the like. Preferably, in the present embodiment, the base 20, the fixing arm 80 and the fixing block 81 may be fixedly connected or detachably connected by a screw.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A clamp is used for clamping a medical workpiece with a fixed column to realize processing treatment of the medical workpiece, and is characterized by comprising:

a base;

the elastic clamping sleeve is arranged on the base and is provided with a first inner cavity for accommodating the fixing column;

the pushing piece is provided with a second inner cavity for accommodating the elastic jacket, and the pushing piece is configured to press the elastic jacket through the cavity wall of the second inner cavity to enable the first inner cavity to contract so as to clamp the fixing column; and

the locking piece is connected with the pushing piece and the base respectively to lock the relative positions of the pushing piece and the elastic jacket.

2. The clamp of claim 1, wherein the second lumen has opposing first and second ends, the first end forming an opening, and the cross-sectional dimension of the second lumen decreasing from the first end to the second end.

3. The clamp of claim 2, wherein the cross-sectional dimension of the second lumen decreases from the first end to the second end to form a tapered configuration.

4. A clamp according to claim 2 or 3, wherein the resilient collet is shaped to match the second internal cavity; the elastic jacket is provided with a third end and a fourth end which are opposite, the cross-sectional dimension of the elastic jacket is reduced from the third end to the fourth end, and the fourth end of the elastic jacket is used for being inserted into the second inner cavity.

5. The clamp of claim 1, wherein at least a portion of the walls of the first lumen are roughened.

6. The holder of claim 5 wherein at least a portion of the walls of said first interior cavity are provided with a coating of silicon carbide to form said roughened surface.

7. The clamp according to claim 4, further comprising a cover plate, wherein the cover plate is disposed on the base, the cover plate is provided with a first through hole, the base is provided with a second through hole communicated with the first through hole, the elastic jacket is disposed in the second through hole, the first inner cavity is simultaneously communicated with the first through hole and the second through hole, the fixing column is inserted into the first inner cavity through the first through hole, and a gap is formed between the wall of the elastic jacket and the wall of the second through hole.

8. The clamp of claim 7, wherein a surface of the cover plate facing the medical workpiece at least partially mates with a surface of the medical workpiece on which the securing posts are disposed.

9. The clamp of claim 7, wherein the locking member is used to connect the pushing member, the base and the cover plate to lock the elastic jacket and the pushing member to keep the clamp in a locked state.

10. The clamp of claim 1, wherein the retaining member is a threaded connector.

11. The clamp of claim 9, further comprising:

the locating part, the locating part sets up in the one end of retaining member for the restriction the retaining member breaks away from support the piece and reach the base, the locating part still is equipped with and is used for the operation the third through-hole of retaining member, the aperture of third through-hole is less than the connection of retaining member the diameter of locating part one end.

12. The clamp of claim 1, further comprising a fixing arm disposed on the base, wherein a fixing block is disposed at an end of the fixing arm facing away from the base, and the fixing arm is connected to an external mechanism through the fixing block.

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