Kirschner wire positioning device

Abstract

The utility model discloses a kirschner wire positioning device, and relates to the field of medical instruments, and the kirschner wire positioning device comprises an arc-shaped probe of which one end is used for abutting against a bone; the guide cylinders are used for inserting kirschner wires, are different in inner diameter and are arranged on the inner side of the arc-shaped probe; the positioning rod is used for installing the guide cylinder in a sliding manner, and one end of the positioning rod is connected with the arc-shaped probe; and the locking assembly is used for locking the relative position of the guide cylinder and the positioning rod. According to the kirschner wire drilling device, the positioning effect and efficiency during drilling operation of the kirschner wire are improved.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a Kirschner wire positioning device. Background Art

[0002] Kirschner wire is a commonly used internal fixation material in orthopedics, often used for fracture fixation or temporary fracture fixation during orthopedic surgery. The diameter of the commonly used Kirschner wire body is 0.5-4mm. When in use, it is generally drilled into various tissues including bones by electric drilling or knocking.

[0003] At present, when dealing with different usage scenarios, it is necessary to select Kirschner wires of corresponding diameters. When the Kirschner wire is drilled, clinical work often uses the direction of the tail end of the Kirschner wire to estimate the possible exit of the Kirschner wire after it penetrates bones and other tissue structures.

[0004] However, since the Kirschner wire has a certain degree of deformation elasticity, its drilling direction is easily offset when drilling into tissue structures such as bones, resulting in the Kirschner wire drilling direction, angle or drilling position failing to meet clinical requirements. Removing the needle and re-drilling, increasing the amount of Kirschner wire used, or replacing Kirschner wires with other diameters will all increase tissue damage to varying degrees. Summary of the Invention

[0005] In view of the shortcomings of the above-mentioned related technologies, the present application provides a Kirschner wire positioning device. The present application uses a guide cylinder and an arc-shaped probe to guide the Kirschner wire and position it at the entry and exit points. At the same time, the guide cylinder with the corresponding inner diameter can be easily selected according to the required Kirschner wire diameter, thereby improving the positioning effect and efficiency of the Kirschner wire during the drilling operation.

[0006] The present application provides a Kirschner wire positioning device that adopts the following technical solutions:

[0007] A Kirschner wire positioning device includes an arc-shaped probe, one end of which is used to abut against a bone;

[0008] A guide cylinder, used for inserting Kirschner wires, provided with multiple guide cylinders having different inner diameters, and arranged inside the arc-shaped probe;

[0009] A positioning rod, used for slidably mounting the guide cylinder, and having one end connected to the arc probe;

[0010] The locking assembly is used to lock the relative positions of the guide cylinder and the positioning rod.

[0011] Preferably, a sleeve is slidably provided on the positioning rod, a mounting post is rotatably embedded in the sleeve, a plurality of guide cylinders are passed through the mounting post, and a fixing assembly for fixing the guide cylinder relative to the sleeve is provided on the sleeve.

[0012] Preferably, a first positioning hole is provided on the peripheral wall of the sleeve, a plurality of second positioning holes are provided on the peripheral wall of the mounting column, a positioning groove is provided on the peripheral wall of the guide cylinder, and the fixing assembly includes a fixing rod which is sequentially provided with the first positioning hole, the second positioning hole and the positioning groove, and an elastic member for driving the fixing rod to move toward the direction close to the guide cylinder.

[0013] Preferably, an annular limiting groove is provided on the inner wall of the sleeve, and an annular limiting strip is provided on the peripheral wall of the mounting column, and the annular limiting strip is slidably embedded in the annular limiting groove.

[0014] Preferably, a driving member for driving the mounting post to rotate relative to the sleeve is fixed on the end surface of the mounting post.

[0015] Preferably, the positioning rod is provided with a plurality of positioning protrusions, and the plurality of positioning protrusions are arranged along the length direction of the positioning rod. A sliding sleeve is provided on the positioning rod, and the guide cylinder is arranged on the sliding sleeve. The locking assembly includes a mounting seat fixed on the sliding sleeve, a locking rod rotatably connected to the mounting seat, and a torsion spring for driving one end of the locking rod to rotate toward the direction close to the positioning rod. A locking head movably inserted between two adjacent positioning protrusions is fixed on the locking rod.

[0016] Preferably, the positioning protrusion is configured to be tooth-shaped, and the side surface of the positioning protrusion along the length direction of the positioning rod is perpendicular to the positioning rod and abuts against the locking head, and the other side surface is configured to be inclined.

[0017] Preferably, an abutment block is fixed to one end of the arc-shaped probe away from the positioning rod, and a clearance groove is provided on the side of the abutment block facing the guide cylinder.

[0018] Preferably, a first anti-slip structure is provided on the side of the abutment block facing the guide cylinder.

[0019] Preferably, a second anti-slip structure is provided on the end surface of the guide cylinder facing the arc probe.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. The Kirschner wire is positioned by sliding a guide cylinder mounted on the positioning rod in combination with a curved probe to adapt to bones of different sizes. The guide cylinder with the corresponding inner diameter can be conveniently selected according to the Kirschner wire diameter, thereby improving the positioning effect and efficiency of the Kirschner wire during drilling operations.

[0022] 2. Multiple guide cylinders with different inner diameters are rotatably mounted on the positioning rod through the mounting column and sleeve, which improves the efficiency of selecting the guide cylinder with the corresponding inner diameter according to the diameter of the Kirschner wire;

[0023] 3. By using the positioning protrusion and locking assembly, when the arc probe and the guide cylinder abut against the bone from both sides of the bone, the guide cylinder is locked relative to the positioning rod, thereby avoiding as much as possible the displacement of the arc probe and the guide cylinder relative to the bone during the process of drilling the Kirschner wire, further improving the positioning effect of the Kirschner wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0026] Figure 2 This is a schematic structural diagram for illustrating the positioning protrusion, the sliding sleeve, and the locking assembly in an embodiment of the present application;

[0027] Figure 3 This is a cross-sectional view used to illustrate the internal structure of the sleeve in the embodiment of the present application;

[0028] Figure 4 It is a structural schematic diagram used to illustrate the abutment block and the first anti-slip structure in an embodiment of the present application.

[0029] Figure numerals: 1. Positioning rod; 2. Arc probe; 3. Guide cylinder; 4. Locking assembly; 41. Mounting seat; 411. Ear plate; 422. Shaft; 42. Locking rod; 43. Torsion spring; 5. Positioning protrusion; 6. Sleeve; 7. Extension rod; 8. Sleeve; 9. Driving member; 10. Fixing rod; 11. Elastic member; 12. Operating piece; 13. Locking head; 14. Annular limiting groove; 15. Annular limiting strip; 16. Third positioning hole; 17. Second positioning hole; 18. Positioning groove; 19. First positioning hole; 20. Second anti-slip structure; 21. Abutment block; 22. First anti-slip structure; 23. Giving groove; 24. Mounting column. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiment of the present application discloses a Kirschner wire positioning device.

[0032] Reference Figure 1A Kirschner wire positioning device includes a positioning rod 1, an arc-shaped probe 2, a guide cylinder 3, and a locking assembly 4 for locking the relative position of the guide cylinder 3 and the positioning rod 1. One end of the arc-shaped probe 2 is connected to the positioning rod 1, and the other end is used to abut against the bone. The guide cylinder 3 is slidably mounted on the positioning rod 1 and is located inside the arc-shaped probe 2. There are multiple guide cylinders 3, and the inner diameters of the multiple guide cylinders 3 are inconsistent, so as to adapt to Kirschner wires of different diameters. In the embodiment of the present application, four guide cylinders 3 are provided. In other embodiments, the number of guide cylinders 3 can also be three, five, etc.

[0033] Reference Figure 2 The positioning rod 1 is provided with multiple positioning protrusions 5, which are arranged along the length of the positioning rod 1. A sliding sleeve 6 is slidably mounted on the positioning rod 1, and the guide cylinder 3 is mounted on the sliding sleeve 6. The locking assembly 4 includes a mounting base 41 fixed to the sliding sleeve 6, a locking rod 42 rotatably connected to the mounting base 41, and a torsion spring 43 for driving one end of the locking rod 42 to rotate toward the positioning rod 1. The locking rod 42 is fixed with a locking head 13 that is movably inserted between two adjacent positioning protrusions 5. Specifically, the mounting base 41 includes two ear plates 411 fixed to the top of the sliding sleeve 6 and a shaft 422 mounted between the two ear plates 411. The middle portion of the locking rod 42 is rotatably mounted on the shaft 422. The torsion spring 43 is mounted on the shaft 422, with one end of the torsion spring fixed to the locking rod 42 and the other end fixed to the ear plate 411. In a natural state, the elastic force of the torsion spring 43 drives the locking head 13 at one end of the locking rod 42 to be inserted between two adjacent positioning protrusions 5, and the other end of the locking rod 42 is tilted.

[0034] In order to further facilitate the adjustment and locking of the position of the guide cylinder 3 on the positioning rod 1, refer to Figure 2 In the embodiment of the present application, the positioning protrusion 5 is configured in a tooth shape, and the locking head 13 is configured at an angle to the locking rod 42. The side surface of the positioning protrusion 5 along the length direction of the positioning rod 1 is perpendicular to the positioning rod 1 and abuts against the locking head 13, and the other side surface is configured at an angle. When it is necessary to adjust the guide cylinder 3 and the curved probe 2 to clamp the bone, the sliding sleeve 6 is driven to slide in the direction close to the curved probe 2. At this time, the locking head 13 slides along the inclined surface of the positioning protrusion 5 to the next positioning protrusion 5 until the curved probe 2 and the guide cylinder 3 both abut against the bone. At this time, because the side surface of the locking head 13 close to the locking sleeve abuts against the side surface of the positioning protrusion 5 perpendicular to the positioning rod 1, it is difficult for the sliding sleeve 6 to slide in the direction away from the curved probe 2, completing the adjustment and locking process of the position of the guide cylinder 3.

[0035] In other embodiments, the positioning protrusion 5 can also be set to a plate shape. Under the action of the torsion spring 43, when the locking head 13 rotates between the two positioning protrusions 5, the locking sleeve is fixed relative to the positioning rod 1. When the position of the guide cylinder 3 on the positioning rod 1 needs to be adjusted, press one end of the locking rod 42 away from the locking head 13 until the locking head 13 rotates to outside the gap between the two positioning protrusions 5, and then push the sliding sleeve 6.

[0036] Reference Figure 1 and Figure 3 An extension rod 7 is fixed to the sliding sleeve 6. A sleeve 8 is fixed to the end of the extension rod 7 away from the sliding sleeve 6. A mounting post 24 is rotatably embedded in the sleeve 8. The four guide cylinders 3 are inserted through the mounting posts 24. The sleeve 8 is provided with a fixing assembly for fixing the guide cylinders 3 relative to the sleeve 8. Specifically, the axes of the four guide cylinders 3 are at the same distance from the axes of the mounting posts 24. An annular limiting groove 14 is formed on the inner wall of the sleeve 8. An annular limiting strip 15 is provided on the peripheral wall of the mounting post 24. The annular limiting strip 15 is slidably embedded in the annular limiting groove 14.

[0037] To replace and fix the guide cylinder 3, refer to Figure 3 The sleeve 8 has a first positioning hole 19 formed on its circumferential wall, the mounting post 24 has a plurality of second positioning holes 17 formed on its circumferential wall, the annular limiting strip 15 has a third positioning hole 16 connected to the second positioning holes 17, and the guide cylinder 3 has a positioning slot 18 formed on its circumferential wall. The fixing assembly includes a fixing rod 10, which is sequentially penetrated through the first positioning hole 19, the third positioning hole 16, the second positioning hole 17, and the positioning slot 18, and an elastic member 11 for urging the fixing rod 10 toward the guide cylinder 3. To facilitate disengagement of the fixing rod 10 from the positioning slot 18, the second positioning hole 17, and the third positioning hole 16, an operating piece 12 is fixed to one end of the fixing rod 10 located outside the mounting post 24. The elastic member 11 is a spring, one end of which is fixed to the circumferential wall of the sleeve 8 and the other end to the operating piece 12. A driving member 9 is fixed to the end surface of the mounting post 24 for driving the mounting post 24 to rotate relative to the sleeve 8. In the embodiment of the present application, the driving member 9 is a corrugated handwheel coaxially fixed on the end face of the mounting column 24 away from the arc probe 2. In other embodiments, the driving member 9 can also be a micro motor equipped with a gear, and the peripheral wall of the mounting column 24 is provided with a tooth groove that meshes with the gear.

[0038] When it is necessary to replace the guide cylinder 3 with a different inner diameter according to the diameter of the Kirschner wire, the fixing rod 10 is pulled by the operating piece 12 in the direction away from the mounting column 24 until it exits the positioning groove 18, the second positioning hole 17 and the third positioning hole 16 in sequence, and the spring is in a stretched state. Then, the mounting column 24 is rotated by the corrugated handwheel to rotate the required guide cylinder 3 to align with the arc probe 2. At this time, under the action of the spring rebound force, the fixing rod 10 passes through the third positioning hole 16 and the second positioning hole 17 in sequence and is inserted into the positioning groove 18 on the peripheral wall of the required guide cylinder 3, completing the replacement process of the guide cylinder 3.

[0039] To avoid the collision between the K-wire tip and the end of the curved probe 2, refer to Figure 4 An abutment block 21 is fixed to the end of the curved probe 2 away from the positioning rod 1. A clearance groove 23 is formed on the side of the abutment block 21 facing the guide cylinder 3. The diameter of the clearance groove 23 is larger than the inner diameter of the guide cylinder 3. When the K-wire needle passes through the guide cylinder 3 and the bone in sequence, it first enters the clearance groove 23, giving the operator time to react and stop the K-wire drilling.

[0040] Further, in order to improve the positioning effect of the arc probe 2 and the guide cylinder 3 when clamping the bone, refer to Figure 3 and Figure 4 The guide cylinder 3 has a second anti-slip structure 20 on its end surface facing the curved probe 2, and the abutment block 21 has a first anti-slip structure 22 on its side facing the guide cylinder 3. In this embodiment, both the first anti-slip structure 22 and the second anti-slip structure 20 are formed by a plurality of conical teeth arranged in a ring. In other embodiments, the first anti-slip structure 22 and the second anti-slip structure 20 may also be anti-slip grooves, an anti-slip rubber layer, or the like.

[0041] The operating principle of a K-wire positioning device according to an embodiment of the present application is as follows: first, a guide cylinder 3 of different inner diameters is replaced according to the diameter of the K-wire. The fixing rod 10 is pulled away from the mounting post 24 by the operating plate 12 until it exits the positioning groove 18, the second positioning hole 17, and the third positioning hole 16 in sequence, with the spring in a stretched state. The mounting post 24 is then rotated by the corrugated handwheel to rotate the desired guide cylinder 3 so as to align with the curved probe 2. At this point, under the force of the spring rebound, the fixing rod 10 sequentially passes through the third positioning hole 16 and the second positioning hole 17 and inserts into the positioning groove 18 on the peripheral wall of the desired guide cylinder 3, completing the replacement process of the guide cylinder 3. The spacing between the guide cylinder 3 and the curved probe 2 is then adjusted to accommodate bones of different sizes. The first anti-slip structure 22 on the curved probe 2 is brought into contact with the bone, and the sleeve 8 is driven toward the curved probe 2 until the second anti-slip structure 20 on the guide cylinder 3 contacts the other side of the bone. Finally, the K-wire is drilled into the bone along the guide cylinder 3.

[0042] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The above are all optional embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A Kirschner wire positioning device, characterized in that: include: A curved probe with one end designed to abut against the bone; A guide cylinder, used for inserting Kirschner wires, provided with multiple guide cylinders having different inner diameters, and arranged inside the arc-shaped probe; A positioning rod, used for slidably mounting the guide cylinder, and having one end connected to the arc probe; A locking assembly is provided for locking the relative positions of the guide cylinder and the positioning rod; a sleeve is slidably provided on the positioning rod, a mounting post is rotatably embedded in the sleeve, a plurality of guide cylinders are passed through the mounting post, and a fixing assembly is provided on the sleeve for fixing the guide cylinder relative to the sleeve; a first positioning hole is provided on the peripheral wall of the sleeve, a plurality of second positioning holes are provided on the peripheral wall of the mounting post, a positioning groove is provided on the peripheral wall of the guide cylinder, and the fixing assembly includes a fixing rod which is sequentially passed through the first positioning hole, the second positioning hole and the positioning groove and an elastic member for driving the fixing rod to move toward the direction close to the guide cylinder.

2. A Kirschner wire positioning device according to claim 1, characterized in that: An annular limiting groove is provided on the inner wall of the sleeve, and an annular limiting strip is provided on the peripheral wall of the mounting column. The annular limiting strip is slidably embedded in the annular limiting groove.

3. A Kirschner wire positioning device according to claim 1, characterized in that: A driving member is fixed on the end surface of the mounting post and is used to drive the mounting post to rotate relative to the sleeve.

4. A Kirschner wire positioning device according to claim 1, characterized in that: The positioning rod is provided with a plurality of positioning protrusions, and the plurality of positioning protrusions are arranged along the length direction of the positioning rod. The sliding sleeve is provided on the positioning rod, and the guide cylinder is arranged on the sliding sleeve. The locking assembly includes a mounting seat fixed on the sliding sleeve, a locking rod rotatably connected to the mounting seat, and a torsion spring for driving one end of the locking rod to rotate toward the direction close to the positioning rod. A locking head movably inserted between two adjacent positioning protrusions is fixed on the locking rod.

5. A Kirschner wire positioning device according to claim 4, characterized in that: The positioning protrusion is configured in a tooth shape. The side surface of the positioning protrusion along the length direction of the positioning rod is perpendicular to the positioning rod and abuts against the locking head, and the other side surface is configured obliquely.

6. The Kirschner wire positioning device according to claim 1, characterized in that: An abutment block is fixed to one end of the arc-shaped probe away from the positioning rod, and a clearance groove is provided on the side of the abutment block facing the guide cylinder.

7. A Kirschner wire positioning device according to claim 6, characterized in that: A first anti-slip structure is provided on the side of the abutment block facing the guide cylinder.

8. The Kirschner wire positioning device according to claim 1, characterized in that: A second anti-slip structure is provided on the end surface of the guide cylinder facing the arc-shaped probe.

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