CN113229917B - Intramedullary nail guide pin - Google Patents

Abstract

The invention provides an intramedullary nail guide pin, comprising: the guide pin comprises a guide pin body, a tail cap and a magnetic block, wherein the guide pin body is in threaded connection with the tail cap, and one end of the guide pin body is provided with a through groove for accommodating the magnetic block along the length direction of the guide pin body, so that the magnetic block is wrapped and fixed in the tail cap after the guide pin body is connected with the tail cap; the tail cap is cylindrical. The advantages are that: the traditional bolt tightening and fixing are cancelled, in the structure of the invention, only the tail cap is connected with the guide pin body by screw threads, and the operation can be carried out without other screwdrivers, thus being convenient for operation; in addition, the magnetic block is wrapped in the tail cap by one end of the tail cap, and the magnetic block is completely fixed in the through groove of the guide pin body, so that the magnetic block is prevented from falling off in installation or operation, meanwhile, the magnetic block is prevented from shifting in the operation process to influence the aiming precision, and the magnetic block can be conveniently replaced.

Description

Intramedullary nail guide pin

Technical Field

The invention relates to the technical field of medical instruments, in particular to an intramedullary nail guide pin.

Background

The existing distal aiming support only has one distal locking hole corresponding to the distal locking hole of the intramedullary nail, after the intramedullary nail is implanted into a femoral medullary cavity in an operation, if the curvature of the intramedullary nail is not fit with the femoral medullary cavity, the distal end of the intramedullary nail is deformed, and the distal locking hole is deviated, after the distal aiming support is installed, a guide hole at the distal end of the support is dislocated with the distal locking hole of a main nail, although the intramedullary nail and the distal aiming support need to be installed and corrected in vitro before the operation, the deformation of the intramedullary nail in the operation cannot be adjusted, so that the intramedullary nail can not pass through the distal locking hole in a drilling process, and finally, a screwed screw is dislocated with the locking hole to cause the condition of locking failure, and the effect of distal locking cannot be achieved.

And the principle of magnetic navigation system aiming frame is that insert the guide pin of distal end area magnetic path in the intramedullary nail main nail through-hole, magnet middle part is located main nail distal end lockhole center, install magnetic indicator at aiming arm distal end again, correspond with the corresponding lockhole of main nail, the attraction is wanted with the magnetic path on the guide pin to one end, make the pointer of indicator directional scale center, show promptly and aim at main nail distal end lockhole, still there is the installation difficulty, the bolt tightening is not tight, the magnetic path is just easy not hard up, insert the back in the main nail with the guide pin body again, aim at magnetic indicator has certain influence, lead to the indicator to aim the precision and reduce.

Disclosure of Invention

The invention provides an intramedullary nail guide pin body, aiming at overcoming at least one technical defect, increasing the stability of a magnetic block, reducing the operation of an operator and improving the aiming precision.

In order to achieve the above purpose, the invention provides the following technical scheme:

intramedullary nail guide pin includes: the guide pin comprises a guide pin body, a tail cap and a magnetic block, wherein the guide pin body is in threaded connection with the tail cap, and one end of the guide pin body is provided with a through groove for accommodating the magnetic block along the length direction of the guide pin body, so that the magnetic block is wrapped and fixed in the tail cap after the guide pin body is connected with the tail cap;

the tail cap is cylindrical.

Preferably, the guide pin body comprises a connecting section, a bearing section and a limiting section, wherein the connecting section, the bearing section and the limiting section are sequentially connected, the bearing section and the limiting section are coaxial, the cross sections of the connecting section, the bearing section and the limiting section are all circular, the cross section diameter of the bearing section is larger than that of the connecting section and smaller than that of the limiting section, and the opening end of the tail cap abuts against the end surface of the limiting section, which faces one side of the bearing section;

wherein the connecting section is in threaded connection with the tail cap; the plurality of limiting holes are arranged along the length direction of the limiting section and penetrate through the limiting section in the width direction, and the limiting holes are used for limiting the insertion depth of the guide pin.

Furthermore, a concave part is arranged on the limiting section, and a plurality of limiting holes are formed in the concave part.

Furthermore, the distances between the adjacent limiting holes on the limiting section are equal.

Preferably, the connecting section is provided with an external thread, the tail cap is internally provided with an internal thread fastening section matched with the connecting section and a containing section matched with the bearing section, and the internal thread fastening section is in threaded connection with the internal thread fastening section through the external thread so as to connect the guide pin body with the tail cap and enable the magnetic block to be fixed in the through groove of the bearing section and be contained in the containing section of the tail cap.

Preferably, the limiting section is provided with scales, and each limiting hole corresponds to a scale value.

The intramedullary nail guide pin has the advantages that:

1. in the structure of the invention, the internal thread in the tail cap and the connection design of the internal thread and the guide pin body cancel the traditional bolt tightening fixation, in the structure of the invention, the tail cap is only required to be connected with the guide pin body by threads, and the operation can be carried out without other screwdrivers, thus being convenient for operation; in addition, the magnetic block is wrapped in the tail cap at one end, and is completely fixed in the through groove of the guide pin body, so that the magnetic block is prevented from falling off in installation or operation, the phenomenon that the magnetic block is displaced in the operation process to influence the aiming precision is avoided, and the magnetic block can be conveniently replaced;

2. the upper limit section structure of the guide pin body is designed, so that the weight is reduced on the premise of ensuring the strength of the guide pin; and the design of the limit hole, the scale and the like can effectively limit or know the insertion depth of the guide pin, thereby determining whether the guide pin is inserted to a required position.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic perspective view of the intramedullary nail guide pin of the present invention;

FIG. 2 and FIG. 3 are schematic perspective views of the needle guiding body from different viewing angles;

FIG. 4 is a partially enlarged view of the guide pin body;

FIG. 5 is an enlarged partial sectional view of the needle guide body;

FIG. 6 is an enlarged cross-sectional view of the tail cap;

FIG. 7 and FIG. 8 are enlarged views of the guide pin body from different viewing angles;

wherein:

the guide pin comprises aguide pin body 1, a throughgroove 11, a connectingsection bearing section 13, alimiting hole 14, a limitingsection 15 and aconcave part 16;

thetail cap 2, the internalthread fastening section 21 and theaccommodating section 22;

and amagnetic block 3.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In order to solve the technical defect that the aiming accuracy of an indicator is reduced due to the fact that a magnetic block in a guide pin is easy to loosen in the prior art, the invention provides an intramedullary nail guide pin, which is shown in figure 1 and comprises: the guide pin comprises aguide pin body 1, atail cap 2 and amagnetic block 3, wherein theguide pin body 1 is in threaded connection with thetail cap 2, and athrough groove 11 for accommodating themagnetic block 3 is formed in one end of theguide pin body 1 along the length direction of the guide pin body, so that themagnetic block 3 is wrapped and fixed in thetail cap 2 after theguide pin body 1 is connected with thetail cap 2;

in a specific implementation process, thetail cap 2 is cylindrical, and for the sake of aesthetic property, the body of theguide pin body 1 and thetail cap 2 are both cylindrical with the same diameter.

In a further implementation: as shown in fig. 2 to 5, theguide pin body 1 further includes a connectingsection 12, abearing section 13 provided with the throughgroove 11, and a limitingsection 15 provided with a plurality of limitingholes 14, which are connected in sequence, the connectingsection 12, thebearing section 13, and the limitingsection 15 are coaxial, and the cross sections of the connectingsection 12, thebearing section 13, and the limitingsection 15 are all circular, so that the influence of the guide pin on the human body is reduced, and the comfort level is improved; the cross section diameter of thebearing section 13 is larger than that of the connectingsection 12 and smaller than that of thelimiting section 15, so that the open end of thetail cap 2 abuts against the end surface of the limitingsection 15 facing to one side of thebearing section 13, on one hand, the connection between thetail cap 2 and theguide pin body 1 is enhanced, and themagnetic block 3 is prevented from sliding off, and on the other hand, when in use, the stability of the connection between thetail cap 2 and theguide pin body 1 can be further enhanced by external force extrusion;

the connectingsection 12 is in threaded connection with thetail cap 2, so that themagnetic block 3 can be conveniently replaced while theguide pin body 1 is tightly connected with thetail cap 2; the plurality of limitingholes 14 are arranged along the length direction of the limitingsection 15 and penetrate along the width direction of the limitingsection 15, and the limitingholes 14 are used for limiting the insertion depth of the guide pin and simultaneously know whether the guide pin is inserted into a proper position.

More specifically, as shown in fig. 7, arecessed portion 16 is disposed on the limitingsection 15, and a plurality of limitingholes 14 are formed in therecessed portion 16 for easy observation; the distances between the adjacent limitingholes 14 on the limitingsection 15 are equal, so that the counting is convenient while the appearance is attractive.

In a further implementation: according to the illustration in fig. 2, 3 and 6, the connectingsection 12 is provided with an external thread, thetail cap 2 is provided with an internalthread fastening section 21 adapted to the connectingsection 12 and anaccommodating section 22 adapted to thebearing section 13, and the internalthread fastening section 21 is in threaded connection with the external thread to connect theguide pin body 1 and thetail cap 2, so that themagnetic block 3 is accommodated in theaccommodating section 22 of thetail cap 2 while being fixed to the throughgroove 11 of thebearing section 13, and themagnetic block 3 is convenient to replace while the work of themagnetic block 3 is not influenced.

As shown in fig. 8, scales are arranged on the limitingsection 15, and eachlimiting hole 14 corresponds to a scale value, so that reading is facilitated.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (2)

1. An intramedullary nail guide pin is characterized in that: the guide pin comprises a guide pin body (1), a tail cap (2) and a magnetic block (3), wherein the guide pin body (1) is in threaded connection with the tail cap (2), and a through groove (11) used for containing the magnetic block (3) is formed in one end of the guide pin body (1) along the length direction of the guide pin body, so that the magnetic block (3) is wrapped and fixed in the tail cap (2) after the guide pin body (1) is connected with the tail cap (2);

the tail cap (2) is cylindrical;

the guide pin body (1) comprises a connecting section (12), a bearing section (13) and a limiting section (15), wherein the connecting section (12), the bearing section (13) and the limiting section (15) are sequentially connected, the bearing section (13) and the limiting section (15) are coaxial, the cross sections of the connecting section (12), the bearing section (13) and the limiting section (15) are all circular, the diameter of the cross section of the bearing section (13) is larger than that of the connecting section (12) and smaller than that of the limiting section (15), and the opening end of the tail cap (2) is abutted to the end face, facing one side of the bearing section (13), of the limiting section (15);

wherein the connecting section (12) is in threaded connection with the tail cap (2); the plurality of limiting holes (14) are distributed along the length direction of the limiting section (15) and penetrate through the limiting section (15) along the width direction, and the limiting holes (14) are used for limiting the insertion depth of the guide pin;

the connecting section (12) is provided with an external thread, the tail cap (2) is internally provided with an internal thread fastening section (21) matched with the connecting section (12) and an accommodating section (22) matched with the bearing section (13), and the internal thread fastening section (21) is in threaded connection with the external thread to connect the guide pin body (1) and the tail cap (2), so that the magnetic block (3) is fixed in the through groove (11) of the bearing section (13) and is accommodated in the accommodating section (22) of the tail cap (2);

a concave part (16) is arranged on the limiting section (15), and a plurality of limiting holes (14) are formed in the concave part (16); the limiting section (15) is provided with scales, and each limiting hole (14) corresponds to a scale value.

2. The intramedullary nail guide pin of claim 1, wherein: the distances between the adjacent limiting holes (14) on the limiting section (15) are equal.

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