CN210727848U

CN210727848U - Sliding compression hollow screw for treating patellar fracture by combining tension belt

Info

Publication number: CN210727848U
Application number: CN201920764057.7U
Authority: CN
Inventors: 李伟; 庄全魁; 陈勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-06-12
Anticipated expiration: 2029-05-27

Abstract

The utility model discloses a combine tension band treatment patellar fracture's slip pressurization hollow screw belongs to a medical instrument for orthopedics, is a combine tension band to be used for treating the novel internal fixation device of patellar fracture, including screw thread owner nail, take cap owner nail and screw thread tail cap triplex. The screw is characterized in that 3 longitudinal screw main nail mouth grooves are formed in the screw main nail body and matched with 3 cap main nail bulges at the tail part of the cap main nail, and the screw main nail and the cap main nail form a whole and can slide in the screw main nail; the tail end of the thread main nail is a self-tapping thread; and the thread of the thread tail cap is matched with the thread of the tail part of the thread main nail. The utility model discloses a slip pressurization hollow screw combines tension band treatment patella fracture, has not only reduced the internal fixation and to the soft tissue stimulation and to tension band cutting force, has realized the tension band simultaneously and has done benefit to fracture end healing to the perpendicular pressor effect of fracture end.

Description

Sliding compression hollow screw for treating patellar fracture by combining tension belt

Technical Field

The invention relates to an orthopedic medical instrument, in particular to a sliding compression hollow screw for treating patellar fracture by combining a tension band.

Background

Tension band fixation has been the standard solution for patellar fracture treatment, but traditional tension band in combination with kirschner wire techniques have many disadvantages: 1. the two Kirschner wires are easy to deform under stress; 2. withdrawing the Kirschner wire and enabling the tension band to fall off; 3. the tail end of the steel needle stimulates surrounding soft tissues to cause discomfort, and severe patients puncture skin or cause infection; 4. the incision requirement is large when a tension band is placed or redundant kirschner wires are cut off, the installation is inconvenient, and the soft tissue is seriously damaged. In order to overcome the defects, some scholars replace the kirschner wire with the hollow compression screw, and the surgical complications are obviously reduced. However, the hollow compression screw in the market at present is used for treating patellar fracture, and has the defects that the tail end of the screw stimulates the skin, the tension belt has cutting force, the length of the screw limits the vertical pressure of the tension belt on the fracture end, and the like. The sliding compression hollow screw reduces the stimulation of internal fixation to soft tissues and the cutting force to the tension band, realizes the effect of the tension band on vertically compressing the fracture end and is beneficial to the healing of the fracture end.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the defects of the hollow compression screw for treating the patellar fracture in the current market, the hollow screw which is combined with the tension band to treat the patellar fracture, can be used for sliding compression, is reliable in fixation, is simple to operate and has few complications is provided.

The technical scheme of the invention is as follows: designing a sliding compression hollow screw for treating patellar fracture by combining a tension band, which consists of a threaded main screw, a main screw with a cap and a threaded tail cap; 3 longitudinal thread main nail mouth grooves are formed in the thread main nail stem part and are matched with 3 cap main nail bulges at the tail part of the cap main nail, the cap main nail can slide in the thread main nail, and the cap main nail and the thread main nail cannot be completely separated; the tail part of the main screw thread is a self-tapping thread; the thread of the thread tail cap is matched with the thread of the tail part of the thread main nail.

The further technical scheme of the invention is as follows: the screw thread main nail is in a hollow cylindrical shape and consists of a screw thread main nail head part, a screw thread main nail dry part and a screw thread main nail tail part; the head part of the screw thread main nail is a section of complete hollow cylinder; the screw thread main nail trunk part is provided with 3 longitudinal screw thread main nail mouth grooves which are matched with the main nail bulge with the cap; the self-tapping screw thread at the tail part of the screw thread main nail is matched with the screw thread of the screw thread tail cap.

The invention further adopts the technical scheme that: the main nail with the cap is in a hollow cylindrical shape and consists of a main nail cap with the cap, a main nail trunk part with the cap and a main nail tail part with the cap; the main nail cap with the cap is of a hollow structure and is in a hexagon socket half-countersunk head shape; the main nail stem part with the cap is a hollow cylinder, and the outer diameter of the main nail stem part with the cap is equal to the inner diameter of the threaded main nail; the tail part of the main nail with the cap is provided with 3 outward main nail bulges with the cap, and the main nail bulges with the cap are matched with the screw thread main nail mouth groove.

The further technical scheme of the invention is as follows: the screw tail cap is of a hollow structure and consists of a screw tail cap body and a screw tail cap body; the screw tail cap is in a hexagon socket half-countersunk head shape; the threaded tail cap body is a hollow column with internal threads.

The sliding compression hollow screw for treating patellar fracture by combining the tension band has the advantages that:

1) the main screw with the screw thread and the main screw with the cap are pressed in a sliding way, so that the resistance is small, the pressing effect is better, and the fracture end can be healed conveniently;

2) the advantage of fixation in the traditional tension belt is kept;

3) the hollow screw replaces a kirschner wire, so that the stimulation of the kirschner wire to surrounding soft tissues is reduced, and the bending, the fracture and the displacement of the kirschner wire are avoided;

4) the design of the half-countersunk tail cap reduces the cutting of the tension band and simultaneously reduces the stimulation to the surrounding soft tissues;

5) the operation steps are simplified, and the complicated steps of binding a tension band and shearing a kirschner wire under a small incision are avoided;

6) the length of the screw can be automatically adjusted, the length of the patella does not need to be measured in the operation, and the patella is of the same type, so that the operation time is saved;

drawings

Figure 1-overall schematic.

Figure 2-combined schematic view of screw thread main nail and tail cap main nail.

FIG. 3 is a schematic view of a combination of a screw main nail and a screw tail cap

Figure 4-schematic view of the threaded main nail.

Fig. 5-schematic view of the capped main nail.

Figure 6-schematic view of the screw tail cap.

Legend label description: the main screw comprises a threaded main screw 1, a threaded main screw head 11, a threaded main screw stem 12, a threaded main screw tail 13, a threaded main screw mouth groove 14, a capped main screw 2, a capped main screw cap 21, a capped main screw stem 22, a capped main screw tail 23, a capped main screw bulge 24, a threaded tail cap 3, a threaded tail cap 31 and a threaded tail cap body 32.

Detailed Description

The patella fracture is reset by opening or closing, and is temporarily fixed by using reset forceps.

Implanting 2 guide pins into proper positions under perspective, and drilling by using a hollow electric drill.

Screwing in the sliding pressurizing screw along the direction of the guide pin, and stopping screwing after the thread position of the main screw is good under perspective; the threaded tail cap is screwed in.

And (5) penetrating a tension band, bundling in a shape like a Chinese character '8', and fixing.

Claims

1. A sliding compression hollow screw for treating patellar fracture by combining a tension band is characterized in that the hollow screw consists of a threaded main screw (1), a capped main screw (2) and a threaded tail cap (3); 3 longitudinal threaded main nail mouth grooves (14) are formed in the threaded main nail stem part (12) and matched with 3 capped main nail bulges (24) of the capped main nail tail part (23), the capped main nail (2) can slide in the threaded main nail (1), and the capped main nail (2) and the threaded main nail (1) cannot be completely separated; the tail part (13) of the main screw thread is self-tapping thread; the thread of the thread tail cap (3) is matched with the thread of the thread main nail tail part (13).

2. The sliding compression cannulated screw for treating patellar fracture in combination with a tension band according to claim 1, wherein the threaded main nail (1) is hollow cylindrical and consists of a threaded main nail head (11), a threaded main nail stem (12) and a threaded main nail tail (13); the head part (11) of the threaded main nail is a section of complete hollow cylinder; the threaded main nail stem part (12) is provided with 3 longitudinal threaded main nail mouth grooves (14), and the threaded main nail mouth grooves (14) are matched with the capped main nail bulge (24); the self-tapping thread of the tail part (13) of the main screw thread is matched with the thread of the tail cap (3).

3. The sliding compression cannulated screw for treating patellar fracture in combination with a tension band of claim 1, wherein the capped spike (2) is hollow cylindrical and consists of a capped spike cap (21), a capped spike stem (22), and a capped spike tail (23); the main nail cap (21) with the cap is of a hollow structure and is of a hexagon socket half-countersunk head shape; the main nail part (22) with the cap is a hollow cylinder, and the outer diameter of the main nail part is equal to the inner diameter of the threaded main nail (1); the tail part (23) of the main nail with the cap is provided with 3 protrusions (24) of the main nail with the cap, which are outward of cuboids, and the protrusions (24) of the main nail with the cap are matched with the screw thread main nail mouth groove (14).

4. The sliding compression cannulated screw for treating patellar fracture in combination with a tension band of claim 1, wherein the threaded tail cap (3) is a cannulated structure consisting of a threaded tail cap (31), a threaded tail cap body (32); the thread tail cap (31) is in a hexagon socket half-countersunk head shape; the threaded tail cap body (32) is a hollow post with internal threads.