CN109907840B

CN109907840B - Centering positioning device

Info

Publication number: CN109907840B
Application number: CN201910281130.XA
Authority: CN
Inventors: 田华; 王彩梅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2023-03-14
Anticipated expiration: 2039-04-09
Also published as: CN109907840A

Abstract

The invention provides a centering and positioning device. The centering device includes: the clamping device comprises two clamping pieces, a clamping mechanism and a positioning mechanism, wherein each clamping piece is provided with a clamping part, a clamping space for clamping a positioned piece is formed between the two clamping parts, and the size of the clamping space is adjustable; the centering positioning structure is positioned between the two clamping pieces and is provided with a centering positioning part; one end of the centering structure is connected with one clamping piece through at least one elastic piece, and the other end of the centering structure is connected with the other clamping piece through at least one elastic piece; wherein, a plurality of elastic components exert elastic force to the location structure in the middle jointly to make the location portion in the middle and two distance between the clamping part the same. The invention effectively solves the problems that the positioning effect aiming at the prosthesis centering positioning is poor and the postoperative effect of a patient is influenced in the prior art.

Description

Centering positioning device

Technical Field

The invention relates to the technical field of medical instruments for orthopedics department, in particular to a centering and positioning device.

Background

At present, in the knee joint replacement surgery of orthopedics, when the femoral condyle prosthesis is implanted, the prosthesis needs to be centered on the far-end articular surface as much as possible, so that the prosthesis is located at the central position of the femoral condyle, the prosthesis has better bony coverage and correct rotation alignment, and the postoperative effect is ensured.

However, in the prior art, the surgeon is often required to center the prosthesis by visual inspection or feel, resulting in poor centering of the prosthesis, which can affect post-operative results.

Disclosure of Invention

The invention mainly aims to provide a centering device to solve the problems that the positioning effect for centering a prosthesis is poor and the postoperative effect of a patient is influenced in the prior art.

In order to achieve the above object, the present invention provides a centering device, comprising: the clamping device comprises two clamping pieces, a clamping mechanism and a positioning mechanism, wherein each clamping piece is provided with a clamping part, a clamping space for clamping a positioned piece is formed between the two clamping parts, and the size of the clamping space is adjustable; the centering structure is positioned between the two clamping pieces and is provided with a centering positioning part; one end of the centering structure is connected with one clamping piece through at least one elastic piece, and the other end of the centering structure is connected with the other clamping piece through at least one elastic piece; wherein, a plurality of elastic components exert elastic force to the location structure in the middle jointly to make the location portion in the middle and two distance between the clamping part the same.

Further, the number of the elastic pieces between the centering structure and one clamping piece is consistent with the number of the elastic pieces between the centering structure and the other clamping piece.

Further, each holder has first connecting portion, and the positioner still includes between two parties: and each clamping piece is connected with the guide structure through a first connecting part, and at least one first connecting part is connected with the guide structure in a sliding manner so as to adjust the size of the clamping space by enabling the first connecting part to slide along the guide structure.

Further, the clamping part is the platelike structure, and each holder includes: the first connecting part is arranged on the connecting body, and the connecting body is clamped or welded with the elastic part; and the plate-shaped structure is connected with the connecting body through the second connecting part so as to extend towards one side far away from the connecting body.

Furthermore, the elastic piece is a spring, the connecting body is of a first cylindrical structure, the first connecting portion and the clamping portion are both connected with the outer surface of the first cylindrical structure, and one end of each spring extends into the first cylindrical structure and is connected with the first cylindrical structure.

Further, the centering structure includes: the centered positioning part is arranged on the second cylindrical structure, and the other end of each spring extends into the second cylindrical structure and is clamped or welded with the second cylindrical structure; and the centered positioning part is connected with the second tubular structure through the third connecting part, and the third connecting part is provided with a scale groove.

Furthermore, the guide structure is a columnar structure, and the extending directions of the first tubular structure, the second tubular structure and the columnar structure are consistent with the telescopic direction of the spring.

Further, the second cylindrical structure is provided with a reference surface S perpendicular to the axis of the second cylindrical structure, the distance between the reference surface S and the two end surfaces of the second cylindrical structure is the same, and the centering positioning part is an indicating tip which passes through the reference surface S.

Further, the centering device further comprises: the pedestal, the pedestal have the mounting gap that the hole section of sliding and be linked together with the hole section of sliding, connect the body setting in the hole section of sliding, second tubular structure slidable ground sets up in the hole section of sliding, and the third connecting portion wear out the pedestal body through the mounting gap outward to make location portion placed in the middle be located outside the pedestal.

Furthermore, the seat body is also provided with a first through groove and a second through groove, the first through groove and the second through groove are communicated with the sliding hole section, the guide structure penetrates out of the seat body through the first through groove, and the second connecting part penetrates out of the seat body through the second through groove so that the clamping part is positioned outside the seat body.

Further, be provided with the scale mark on the pedestal to through making scale groove and scale mark correspond the setting in order to adjust the location portion placed in the middle.

By applying the technical scheme of the invention, the centering device comprises two clamping pieces, a centering structure and a plurality of elastic pieces. Each clamping piece is provided with a clamping part, a clamping space for clamping the positioned piece is formed between the two clamping parts, and the size of the clamping space is adjustable. The centering structure is located between the two clamping pieces and is provided with a centering part. One end of the centering structure is connected with one clamping piece through at least one elastic piece, and the other end of the centering structure is connected with the other clamping piece through at least one elastic piece. Like this, before implanting the prosthesis by setting element (femoral condyle), with two clamping parts centre gripping of positioner in the middle on being positioned (femoral condyle), a plurality of elastic components apply the elastic force to the location structure in the middle jointly, so that the distance between location portion in the middle and two clamping parts is the same, location portion in the middle is in the middle on being positioned (femoral condyle) promptly, and then confirmed the central line position of being positioned (femoral condyle), and then solved among the prior art to the prosthesis location effect in the middle relatively poor, influence the problem of patient's postoperative effect, so that later stage prosthesis implantation is in the femoral condyle.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic perspective view of an embodiment of a centering device according to the invention;

FIG. 2 shows a top view of the centering device of FIG. 1;

FIG. 3 showsbase:Sub>A cross-sectional view A-A of the centering device of FIG. 2;

FIG. 4 shows a perspective view of one of the clamping members of the centering device of FIG. 1 assembled with a guide structure;

FIG. 5 shows a top view of one of the clamps of FIG. 4 assembled with a guide structure;

FIG. 6 shows a cross-sectional view taken along line B-B of one of the clips of FIG. 5 assembled with a guide structure;

FIG. 7 shows a perspective view of another clamp of the centering device of FIG. 1;

FIG. 8 shows a top view of the alternative clamp of FIG. 7;

FIG. 9 shows a cross-sectional view C-C of the alternative clamp of FIG. 8;

FIG. 10 shows a perspective view of the centering structure of the centering device of FIG. 1;

FIG. 11 shows a cross-sectional view of the centering structure of FIG. 10;

fig. 12 shows a perspective view of the housing of the centering device of fig. 1;

fig. 13 shows a front view of the housing of fig. 12; and

fig. 14 shows a cross-sectional view of the housing of fig. 13 taken along line D-D.

Wherein the figures include the following reference numerals:

10. a clamping member; 11. a clamping part; 12. a first connection portion; 13. a connecting body; 14. a second connecting portion; 20. a centering structure; 21. a centering positioning part; 22. a second cylindrical structure; 23. a third connecting portion; 231. a scale groove; 30. an elastic member; 40. a guide structure; 50. a base body; 51. a sliding hole section; 52. installing a notch; 53. a first through groove; 54. a second through groove; 55. scale marks.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, 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 application belongs.

In the present invention, unless stated to the contrary, the use of directional terms such as "up" and "down" are generally with respect to the orientation shown in the drawings, or to the vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.

In order to solve among the prior art relatively poor to the positioning effect of prosthesis location placed in the middle, influence the problem of patient's postoperative effect, this application provides a positioner placed in the middle.

As shown in fig. 1 to 3, the centering device includes two clamping members 10, a centering structure 20, and two elastic members 30. Wherein, each clamping piece 10 is provided with a clamping part 11, a clamping space for clamping the positioned piece is formed between the two clamping parts 11, and the size of the clamping space can be adjusted. A centering structure 20 is located between the two clamps 10, the centering structure 20 having a centering portion 21. One end of the centering structure 20 is connected to one of the clamping members 10 by an elastic member 30, and the other end of the centering structure 20 is connected to the other clamping member 10 by an elastic member 30. Wherein the two elastic members 30 together apply an elastic force to the centering structure 20 so that the distance between the centering portion 21 and the two clamping portions 11 is the same.

By applying the technical scheme of the embodiment, before the prosthesis is implanted into the positioned part (femoral condyle), the two clamping parts 10 of the centering device are clamped on the positioned part (femoral condyle), the two elastic parts 30 apply elastic force to the centering structure 20 together, so that the distance between the centering part 21 and the two clamping parts 11 is the same, namely, the centering part 21 is centered on the positioned part (femoral condyle), and then the central line position of the positioned part (femoral condyle) is determined, and then the problems that the positioning effect for centering the prosthesis in the prior art is poor, and the postoperative effect of a patient is influenced are solved, so that the prosthesis is implanted into the femoral condyle in the later stage.

In this embodiment, the centering device is primarily used for femoral condyle prosthetic implants for knee replacement. Wherein the centering device of this embodiment can be applied to either a total knee replacement or a unicondylar replacement. At the same time, the centering portion 21 can be scribed on the positioned piece (femoral condyle) so that a centering line is created on the positioned piece (femoral condyle).

The number of the elastic members 30 is not limited to this, as long as the elastic force can be applied to the centering structure 20. Alternatively, the elastic members 30 are four or six or eight.

In this embodiment, the number of spring elements 30 between the centering structure 20 and one clamp 10 corresponds to the number of spring elements 30 between the centering structure 20 and the other clamp 10. Specifically, two elastic members 30 are respectively disposed between the centering structure 20 and the two clamping members 10, so that the elastic forces applied by the two elastic members 30 to the centering structure 20 are equal in magnitude and opposite in direction, and the centering structure 20 is ensured to be equal to the distance between the two clamping portions 11 under the elastic forces of the two elastic members 30.

As shown in fig. 4 to 9, each clamp 10 has a first connection portion 12, and the centering device further comprises a guide structure 40. Wherein each of the clamping members 10 is connected to the guide structure 40 through the first connecting portion 12, and one of the first connecting portions 12 is slidably connected to the guide structure 40 to adjust the size of the clamping space by sliding the first connecting portion 12 along the guide structure 40. Thus, the surgeon can easily manipulate the two clamps 10 by pulling on the clamps 10 slidably connected to the guide structure 40 to clamp the two clamps 10 to the component to be positioned (femoral condyle). Meanwhile, the centering positioning device can be suitable for the positioned parts (femoral condyles) with different sizes, and the application range of the centering positioning device is enlarged.

Specifically, one holding member 10 is fixed on the guiding structure 40, one holding member 10 is slidably disposed on the guiding structure 40, and the doctor can adjust the distance between the two holding parts 11 by operating the holding member 10 slidably connected with the guiding structure 40, i.e. the size of the holding space can be adjusted, so that the centering device can be applied to the positioned parts (femoral condyles) with different sizes.

The number of the first connecting portions 12 slidably connected to the guide structure 40 is not limited to this. Optionally, both first connection portions 12 are slidably connected with the guide structure 40 to adjust the distance between the two clamping portions 11, thereby enabling the centering device to be applied to differently sized positioned members (femoral condyles).

As shown in fig. 4 to 9, the clamping portion 11 is a plate-shaped structure, and each clamping member 10 includes a connecting body 13 and a second connecting portion 14. Wherein, the first connecting portion 12 is disposed on the connecting body 13, and the connecting body 13 is welded with the elastic member 30. The plate-like structure is connected with the connection body 13 by means of a second connection portion 14 such that the plate-like structure extends towards a side remote from the connection body 13. Thus, the connection between the connecting body 13 and the elastic element 30 is more stable due to the arrangement, and the phenomenon that the normal use of the centering positioning device is affected due to the mutual separation of the connecting body and the elastic element is avoided. Meanwhile, the structure is simple, and the processing and the realization are easy.

In the present embodiment, the above arrangement of the clamping portion 11 increases the contact area between the clamping portion 11 and the positioned component (femoral condyle), so that the clamping of the clamping portion 11 on the positioned component (femoral condyle) is more stable, and the influence on the determination of the midline position due to the accidental detachment of the clamping portion and the positioned component is prevented.

The connection manner of the connecting body 13 and the elastic member 30 is not limited to this. Optionally, the connecting body 13 is snapped with the elastic member 30. Thus, the arrangement makes the connection body 13 and the elastic element 30 easier and simpler to disassemble and assemble, and reduces the difficulty of disassembling and assembling.

As shown in fig. 6 and 9, the elastic member 30 is a spring, the connecting body 13 is a first cylindrical structure, the first connecting portion 12 and the holding portion 11 are both connected to an outer surface of the first cylindrical structure, and one end of each spring extends into the first cylindrical structure and is connected to the first cylindrical structure. In this way, the clamping portion 11 and the first connecting portion 12 both extend away from the first cylindrical structure to ensure that the clamping portion 11 can clamp the component to be positioned (femoral condyle), and the first connecting portion 12 can be connected with the guide structure 40.

In this embodiment, one end of the spring extends into the inner cylinder of the first tubular structure to be in interference fit with the cylinder wall of the inner cylinder, so as to prevent the two from being separated from each other and affecting the normal use of the centering device.

As shown in fig. 10 and 11, the centering structure 20 includes a second cylindrical structure 22 and a third connecting portion 23. The centering and positioning portion 21 is disposed on the second cylindrical structure 22, and the other end of each spring extends into the second cylindrical structure 22 and is clamped or welded with the second cylindrical structure 22. The centering and positioning portion 21 is connected to the second cylindrical structure 22 by a third connecting portion 23, and the third connecting portion 23 has a scale groove 231. Therefore, the structure is simple, the processing and the realization are easy, and the processing cost of the centering positioning device is reduced.

Specifically, one end of the first spring extends into the inner cylinder of the first cylindrical structure to be in interference fit with the cylinder wall of the inner cylinder. The other end of the spring extends into the inner cylinder at one side of the second cylindrical structure 22 and is in interference fit with the cylinder wall of the inner cylinder, and then one side of the first cylindrical structure and one side of the second cylindrical structure 22 are connected together through the spring; one end of the second spring extends into the inner cylinder of the second first cylindrical structure to be in interference fit with the cylinder wall of the inner cylinder. The other end of the spring extends into the inner cylinder on the other side of the second cylindrical structure 22 and is in interference fit with the cylinder wall of the inner cylinder, and then the other sides of the second first cylindrical structure and the second cylindrical structure 22 are connected together through the spring, so that the two springs connect the two first cylindrical structures and the second cylindrical structure 22 together. When the first cylindrical structure connected with the guiding structure 40 in a sliding manner moves along the extension direction of the spring, the second cylindrical structure 22 moves along with the spring under the elastic force of the spring until the two ends of the second cylindrical structure 22 are stressed in a balanced manner, and the central positioning part 21 is located at the midline position of the positioned part (femoral condyle).

As shown in fig. 1 to 3, the guiding structure 40 is a column structure, and the extending directions of the first cylinder structure, the second cylinder structure 22 and the column structure are all the same as the extending direction of the spring. Specifically, the first connecting portion 12 is sleeved outside the columnar structure to be connected with the columnar structure, so that the first connecting portion 12 slides along the columnar structure more easily and conveniently. Thus, the sliding direction of the first tubular structure, the sliding direction of the second tubular structure 22 and the extending and retracting direction of the spring, which are slidably connected with the guide structure 40, are on the same straight line, so that the stress direction of the second tubular structure 22 (the centering positioning structure 20) is consistent with the sliding direction of the second tubular structure, and further, the second tubular structure 22 is prevented from being twisted in the sliding process, and the positioning accuracy of the centering positioning part 21 is ensured.

As shown in fig. 3 and 11, the second cylindrical structure 22 has a reference surface S perpendicular to the axis thereof, the reference surface S and the distance between both end surfaces of the second cylindrical structure 22 are the same, and the centering and positioning portion 21 is an indicating tip that passes the reference surface S. In this way, the above arrangement ensures that the indicator tip is located on the mid-line of the centering structure 20, thereby ensuring the positioning accuracy of the centering portion 21.

In this embodiment, the centering structure 20 is a symmetrical structure, indicating that the tip is passing through its plane of symmetry.

As shown in fig. 12 to 14, the centering device further includes a seat body 50. The seat body 50 has a sliding hole section 51 and an installation notch 52 communicated with the sliding hole section 51, the connection body 13 is disposed in the sliding hole section 51, the second cylindrical structure 22 is slidably disposed in the sliding hole section 51, and the third connection portion 23 penetrates through the seat body 50 through the installation notch 52, so that the centered positioning portion 21 is located outside the seat body 50. In this way, the seat body 50 can protect the elastic element 30, the connecting body 13 and the second cylindrical structure 22 on one hand; on the other hand, the above-mentioned setting up of pedestal 50 makes positioner's in middle outward appearance more pleasing to the eye, promotes doctor's visual experience.

As shown in fig. 14, the seat body 50 further has a first through groove 53 and a second through groove 54, the first through groove 53 and the second through groove 54 are both communicated with the sliding hole section 51, the guiding structure 40 passes through the first through groove 53 and passes out of the seat body 50, and the second connecting portion 14 passes through the second through groove 54 and passes out of the seat body 50, so that the clamping portion 11 is located outside the seat body 50. Thus, the structure of the centering positioning device is more compact and attractive due to the arrangement.

As shown in fig. 12 and 13, the seat body 50 is provided with a scale 55, so that the centering and positioning portion 21 can be adjusted by arranging the scale groove 231 corresponding to the scale 55. Specifically, after the centering and positioning portion 21 is centered, the doctor can manually adjust the position of the centering and positioning portion 21, so that the scale groove 231 and the scale line 55 are correspondingly arranged, and thus good bony coverage and correct prosthesis rotation alignment of prosthesis installation are effectively ensured. Wherein the adjusted size of the centering and positioning portion 21 can be known by the scale lines 55.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

before implanting the prosthesis by setting element (thighbone condyle), with two clamping parts centre gripping of positioner in the middle on being positioned piece (thighbone condyle), a plurality of elastic components apply elastic force to the location structure in the middle jointly, so that the distance between location portion in the middle and two clamping parts is the same, location portion in the middle is in the middle on being positioned piece (thighbone condyle) promptly, and then confirmed the central line position of being positioned piece (thighbone condyle), and then solved among the prior art to the prosthesis location effect central relatively poor, influence the problem of patient postoperative effect, so that later stage prosthesis is implanted in the thighbone condyle.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. 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.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A centering device, comprising:

the device comprises two clamping pieces (10), wherein each clamping piece (10) is provided with a clamping part (11), a clamping space for clamping a positioned piece is formed between the two clamping parts (11), and the size of the clamping space is adjustable;

a centering structure (20) located between the two clamps (10), the centering structure (20) having a centering portion (21);

a plurality of elastic pieces (30), one end of the centering structure (20) is connected with one clamping piece (10) through at least one elastic piece (30), and the other end of the centering structure (20) is connected with the other clamping piece (10) through at least one elastic piece (30); wherein a plurality of elastic pieces (30) jointly apply elastic force to the centering structure (20) so that the distance between the centering portion (21) and the two clamping portions (11) is the same;

each of the clamps (10) has a first connection portion (12);

the clamping part (11) is of a plate-shaped structure, and each clamping piece (10) comprises:

the first connecting part (12) is arranged on the connecting body (13), and the connecting body (13) is clamped or welded with the elastic part (30);

a second connection portion (14), by means of which the plate-shaped structure is connected with the connection body (13) such that it extends towards a side remote from the connection body (13).

2. Centering device according to claim 1, characterized in that the number of said elastic elements (30) between said centering structure (20) and one of said clamps (10) corresponds to the number of said elastic elements (30) between said centering structure (20) and the other of said clamps (10).

3. The centering device of claim 1, further comprising:

a guide structure (40), each of the clamping members (10) being connected to the guide structure (40) by the first connecting portion (12), at least one of the first connecting portions (12) being slidably connected to the guide structure (40) to adjust the size of the clamping space by sliding the first connecting portion (12) along the guide structure (40).

4. A centering device according to claim 3, characterized in that said elastic member (30) is a spring, said connecting body (13) is a first cylindrical structure, said first connecting portion (12) and said clamping portion (11) are both connected with the outer surface of said first cylindrical structure, and one end of each of said springs is extended into and connected with said first cylindrical structure.

5. The centering device of claim 4, wherein said centering structure (20) comprises:

the centering positioning part (21) is arranged on the second cylindrical structure (22), and the other end of each spring extends into the second cylindrical structure (22) and is clamped or welded with the second cylindrical structure (22);

a third connecting portion (23), the centering portion (21) being connected to the second cylindrical structure (22) through the third connecting portion (23), the third connecting portion (23) having a scale groove (231).

6. The centering device of claim 5, wherein said guide structure (40) is a cylindrical structure, and the extension directions of said first cylindrical structure, said second cylindrical structure (22) and said cylindrical structure are all consistent with the extension and retraction directions of said spring.

7. A centring device according to claim 5, characterised in that the second cylinder (22) has a reference surface S perpendicular to its axis, the reference surface S being the same distance from the two end faces of the second cylinder (22), the centring portion (21) being an index tip which passes over the reference surface S.

8. The centering device of claim 5, further comprising:

the connecting structure comprises a base body (50), wherein the base body (50) is provided with a sliding hole section (51) and an installation notch (52) communicated with the sliding hole section (51), the connecting body (13) is arranged in the sliding hole section (51), the second cylindrical structure (22) is arranged in the sliding hole section (51) in a sliding mode, and the third connecting part (23) penetrates out of the base body (50) through the installation notch (52) so that the centered positioning part (21) is located outside the base body (50).

9. The centering device as claimed in claim 8, wherein the seat body (50) further has a first through slot (53) and a second through slot (54), the first through slot (53) and the second through slot (54) are both communicated with the sliding hole section (51), the guiding structure (40) passes through the first through slot (53) and out of the seat body (50), and the second connecting portion (14) passes through the second through slot (54) and out of the seat body (50), so that the clamping portion (11) is located out of the seat body (50).

10. The centering device according to claim 8, characterized in that a graduation mark (55) is provided on the seat body (50) to adjust the centering portion (21) by arranging the graduation groove (231) corresponding to the graduation mark (55).