CN214761413U

CN214761413U - Locking fitting for intramedullary nail implantation

Info

Publication number: CN214761413U
Application number: CN202121176784.5U
Authority: CN
Inventors: 王升
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-11-19
Anticipated expiration: 2031-05-28

Abstract

The utility model relates to the field of medical equipment, in particular to a locking accessory for implanting an intramedullary nail, which comprises an intramedullary nail body, a locking accessory and a locking screw; a locking hole is arranged at the far end or the near end of the intramedullary nail body, a locking accessory extends into the locking hole, and a locking screw extends into the locking accessory to fasten and lock the intramedullary nail body; the locking fitting comprises a fitting tail part and a fitting head part, and the fitting tail part and the fitting head part are both provided with a channel for the penetration of a locking screw; the inner cavity wall at the tail part of the fitting is provided with an inner thread which is matched with the locking screw to work. Through this intramedullary nail implantation uses with locking accessory cooperation, promoted the convenience of the installation of the distal end locking nail of intramedullary nail implantation operation in-process, promoted the locking success rate.

Description

Locking fitting for intramedullary nail implantation

Technical Field

The utility model relates to the field of medical equipment, concretely relates to intramedullary nail is implanted with locking accessory's technical field of structure.

Background

An interlocking intramedullary nail is a common orthopedic internal fixation instrument for fracture fixation of tibia, femur and humerus; the structure is provided with an intramedullary nail rod, a near-end locking screw hole is arranged at the near end of the intramedullary nail rod, and a pressure reduction plane is arranged on the surface of the intramedullary nail rod. More than one strip-shaped decompression plane is arranged on the surface of the intramedullary nail rod, and the decompression plane can extend from the proximal end of the intramedullary nail rod to the distal end of the intramedullary nail rod. The proximal end of the intramedullary nail rod is provided with a locking screw rod positioning screw hole and a connecting sleeve positioning groove.

In intramedullary nail implantation surgery, it is often encountered that the distal locking nail is difficult to install, resulting in a reduced locking success rate and prone to post-operative complications.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an intramedullary nail is implanted and is used with locking accessory, and collocation intramedullary nail and implantation instrument use have promoted the convenience of the installation of the distal end locking nail of intramedullary nail implantation operation in-process, promote the locking success rate.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the locking fitting for implanting the intramedullary nail comprises a fitting tail part and a fitting head part, wherein the fitting tail part and the fitting head part are both provided with a channel for a locking screw to penetrate through; an inner thread matched with the locking screw to work is arranged on the inner cavity wall at the tail part of the accessory; the locking screw passes through the fitting tail, the fitting head and the intramedullary nail body.

Further, the fitting tail has a cross-sectional dimension greater than a cross-sectional dimension of the fitting head.

Furthermore, a clamping groove is formed in one end, far away from the head, of the tail of the accessory.

Furthermore, one end of the head part of the fitting, which is far away from the tail part of the fitting, is a far end of the head part of the fitting, and the cross-sectional dimension of the far end of the head part of the fitting is smaller than that of other parts of the head part of the fitting.

Further, an external thread is provided on the outside of the fitting head in the direction of the entry and exit of the locking screw.

Further, the fitting head gradually decreases in cross-sectional dimension in a direction away from the fitting tail.

Compared with the prior art, the utility model discloses can reach one of following beneficial effect at least:

1. through this intramedullary nail implantation uses with locking accessory cooperation, promoted the convenience of the installation of the distal end locking nail of intramedullary nail implantation operation in-process, promoted the locking success rate.

2. Through setting up the joint structure, promote the stability of locking screw locking.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of an embodiment of the locking fitting of the present invention.

Fig. 4 is a schematic structural diagram of another view angle of fig. 3.

Fig. 5 is a schematic view of another embodiment of the locking fitting of the present invention.

Fig. 6 is a schematic structural diagram of another view angle of fig. 5.

Fig. 7 is a schematic structural view of another embodiment of the locking fitting of the present invention.

Fig. 8 is a schematic structural diagram of another view angle of fig. 7.

In the figure: 1-intramedullary nail body; 2-locking the fitting; 21-fitting tail; 211-card slot; 212-internal screw thread; 22-fitting head; 221-fitting head distal end; 222-external threads; 3-locking screws; 31-screw tail; 32-screw shank.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

as shown in fig. 1-8, the locking fitting for intramedullary nail implantation, the locking fitting 2 extends into the distal locking hole of the intramedullary nail, and the locking screw 3 extends into the locking fitting 2 to tightly lock the intramedullary nail body 1; the locking fitting 2 comprises a fitting tail 21 and a fitting head 22, both the fitting tail 21 and the fitting head 22 being provided with a passage for the locking screw 3 to pass through; an internal thread 212 matched with the locking screw 3 is arranged on the inner cavity wall of the fitting tail part 21; the locking screw 3 passes through the fitting tail 21, the fitting head 22 and the intramedullary nail body 1.

When the intramedullary nail is in operation, an operation matched instrument is utilized to implant the intramedullary nail body 1 into a medullary cavity, then a hole is formed at a position of a bone near a distal locking hole of the intramedullary nail body 1 (on the outer side of a femur), the distal locking hole is searched in a Kirschner wire insertion hole, a hollow drill is used for drilling and expanding a bone tunnel by taking the Kirschner wire as a guide, then the locking accessory 2 is implanted, as shown in figure 2, the tail part 21 of the accessory is positioned at the outer side of the bone, the head part 22 of the accessory extends into the bone and is not contacted with the intramedullary nail body, then the locking screw 3 is screwed into the bone through the locking accessory 2, and the (inner channel) of the locking accessory 2 is used as a guide, so that an operation doctor can be helped to lock the distal locking nail of the interlocking nail under direct vision, and the distal locking and the positioning of the intramedullary nail are realized; thereby effectively improving the installation of the locking nail in the intramedullary nail operation and improving the success rate of locking; in the operation, the use of X-ray (perspective tool) in the operation is avoided to the greatest extent, and the X-ray exposure of the operating doctor and the patient is reduced; promoting fracture healing and early movement of corresponding joints, and greatly reducing related complications.

After the fracture is healed, the locking fitting 2 is taken out together when the intramedullary nail is taken out.

Preferably, a decompression plane is arranged on the surface of the intramedullary nail; the intramedullary nails referred to herein are all interlocking intramedullary nails; one embodiment of the locking screw 3 is a cannulated locking screw.

Under some circumstances, the shape of the marrow cavity of the skeleton is not in accordance with the shape of the interlocking intramedullary nail, and the acting force is generated, so that the acting force can be acted on the fracture end, the intramedullary nail and the skeleton generate the acting force in the process of implanting and locking the intramedullary nail, and the distal locking nail is difficult to implant smoothly, therefore, the locking accessory is arranged, the locking screw is screwed in through the locking accessory, a stress point is provided for the intramedullary nail body, the locking screw and the fracture end, the fracture end is finely adjusted, the locking operation is convenient, and the healing of postoperative fracture is facilitated.

Example 2:

as shown in fig. 1 to 8, the present embodiment optimizes the lock fitting structure for the above-described embodiment.

The cross-sectional dimension of the fitting tail 21 is larger than the cross-sectional dimension of the fitting head 22 in the locking fitting for intramedullary nail implantation. When the locking screw is implanted, the tail part 21 of the accessory is positioned outside the bone, and the head part 22 of the accessory extends into the bone, so that when the locking screw is implanted in an operation, the tail part 21 of the accessory is limited through a tool, and the locking screw 3 can be screwed in conveniently.

Example 3:

The end of the fitting head 22 far away from the fitting tail 21 in the locking fitting for intramedullary nail implantation is a fitting head distal end 221, and the cross-sectional dimension of the fitting head distal end 221 is smaller than that of other parts of the fitting head 22. The diameter (size/caliber) of the locking fitting is reduced, so that the locking fitting 2 can be conveniently implanted into the bone, and the intraoperative success rate is improved.

Example 4:

In the locking fitting for intramedullary nail implantation, an external thread 222 is provided on the outer side of the fitting head 22 in the direction of the entry and exit of the locking screw. Can improve the stability of the fastening connection between the fitting head 22 and the skeleton and improve the fracture fixation effect.

In this embodiment, the fitting tail 21 can be omitted, consumables can be saved, trauma and discomfort to the patient during the operation can be reduced, and complications can be reduced.

Example 5:

In the locking fitting for intramedullary nail implantation, the cross-sectional dimension of the fitting head 22 is gradually reduced in a direction away from the fitting tail 21. The diameter (size/caliber) of the locking fitting is reduced, so that the locking fitting 2 can be conveniently implanted into the bone, and the intraoperative success rate is improved.

Example 6:

In the locking fitting for intramedullary nail implantation, a clamping groove 211 is arranged at one end of the fitting tail 21 far away from the fitting head 22.

One embodiment is: the clamping groove 211 is communicated with the inner channel of the locking fitting 2 and is used for clamping the tail part 31 of the screw; after the locking screw 3 is screwed in, the screw tail part 31 is just clamped in the clamping groove 211, so that the leakage of the screw is reduced.

The other implementation mode is as follows: the clamping groove 211 is formed in the outer edge of the tail portion 21 of the accessory, when the locking screw is implanted, the locking accessory 2 can be limited through an auxiliary tool (similar to a proximal tail clamping groove of an intramedullary nail), and implantation convenience is improved.

Preferably, the outer surface of the fitting head 22 is smooth to minimize internal trauma to the patient during movement after tightening.

Preferably, the outer side of the fitting head 22 is provided with an external thread, so that the fastening connection stability of the fitting head 22 and the bone can be improved, and the fracture fixation effect can be improved.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. Intramedullary nail is implanted and is used locking accessory, its characterized in that: the locking bolt comprises an accessory tail part (21) and an accessory head part (22), wherein the accessory tail part (21) and the accessory head part (22) are both provided with a channel for the penetration of a locking bolt (3); an inner thread (212) matched with the locking screw (3) is arranged on the inner cavity wall of the fitting tail part (21); the locking screw (3) passes through the fitting tail (21), the fitting head (22) and the intramedullary nail body (1).

2. The locking fitting for intramedullary nail implantation of claim 1, wherein: the cross-sectional dimension of the fitting tail (21) is greater than the cross-sectional dimension of the fitting head (22).

3. The locking fitting for intramedullary nail implantation of claim 1, wherein: and a clamping groove (211) is arranged at one end of the accessory tail part (21) far away from the accessory head part (22).

4. The locking fitting for intramedullary nail implantation of claim 1, wherein: the end of the fitting head (22) far away from the fitting tail (21) is a fitting head far end (221), and the cross section size of the fitting head far end (221) is smaller than that of other parts of the fitting head (22).

5. The locking fitting for intramedullary nail implantation of claim 1, wherein: an external thread (222) is provided on the outside of the fitting head (22) in the direction of insertion and removal of the locking screw.

6. The locking fitting for intramedullary nail implantation of claim 1, wherein: the cross-sectional dimension of the fitting head (22) decreases in a direction away from the fitting tail (21).