CN211156184U

CN211156184U - Breakable half-thread kirschner wire

Info

Publication number: CN211156184U
Application number: CN201920872808.7U
Authority: CN
Inventors: 董新利; 苏云; 孙强; 肖驰; 刘晗
Original assignee: Affiliated Zhongshan Hospital of Dalian University
Current assignee: Affiliated Zhongshan Hospital of Dalian University
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-08-04
Anticipated expiration: 2029-06-12

Abstract

The utility model discloses a half screw thread kirschner wire can break, including kirschner wire near-end polished rod portion, can break joint portion, kirschner wire distal end screw thread portion and pointed end portion, kirschner wire near-end polished rod portion diameter unanimous with kirschner wire distal end screw thread portion external diameter, kirschner wire distal end screw thread portion pitch is whole to be equal, and threaded external diameter, pitch and the degree of depth are unanimous moreover, kirschner wire distal end screw thread portion length be enough to pass the bone cortex of fracture piece to the side, kirschner wire near-end polished rod portion and kirschner wire distal end screw thread portion junction be the joint portion that can break, it is a horizontal annular groove, the groove depth is big than screw thread portion thread depth. The utility model has the advantages that the fixation of the long thread is firm and reliable for the small bone block, the slippage is not easy, and the early function exercise of the joint is facilitated; the kirschner wire is safe and convenient to take out through the skin after the fracture is healed, thereby avoiding secondary operation and furthest relieving the pain of a patient; and the price is low, and the economic burden of the patient is reduced.

Description

Breakable half-thread kirschner wire

Technical Field

The utility model belongs to surgery device, apparatus or method field, concretely relates to half screw thread kirschner wire can break.

Background

Fracture of ulna coronary process is one of the common diseases in trauma orthopedics, and is mostly combined with elbow joint dislocation and elbow fracture. With the understanding of the anatomy and injury mechanism of the ulnar coronary process, the importance of the ulnar coronary process in elbow joint stability has been recognized by the industry, and the treatment aim is to preserve elbow joint mobility and stability and avoid or reduce the occurrence of post-traumatic complications. Clinically, the ulna coronary fracture II and above is treated by operations which are advocated at present, and the operation modes are various and have advantages and disadvantages, for example, the operation using the common kirschner wire is low in price but has the risk that the postoperative bone block is easy to slip and move again; the micro locking steel plate or the headless nail is firmly fixed, but the price is high, the volume of the fixed bone block is strictly required, the bone block is easy to burst in the operation, the internal fixation is not taken out for a long time after the fracture healing to cause the potential safety hazard in the body, or the bone block can be taken out but causes larger secondary injury; in summary, for the small bone fragments in type II fracture, the fixation difficulty is large, and the treatment is troublesome. Although the existing improved kirschner wire can be provided with a broken joint and a thread, the length of the thread is short, the thread has a pressurizing effect, the thread cannot penetrate through cortical bone on the opposite side of a fracture block, the fixing effect is poor, the needle cannot be taken out after the pressurizing effect is achieved, the needle can be left in the body for a long time, the treatment is delayed due to the influence on nuclear magnetic examination which may be needed in the future, and a certain mental burden is caused to a patient.

For example, chinese patent application No. 2015203179206 provides a compression breakable k-wire comprising a needle body, a head thread and an intermediate section thread on a head of the needle body, the needle body between the head thread and the intermediate section thread being a polished rod, characterized in that the head thread pitch and the intermediate section thread pitch are of different sizes, i.e., the head thread pitch is greater than the intermediate section thread pitch, or the head thread pitch is less than the intermediate section thread pitch; the diameter of the head thread is smaller than that of the middle section thread, and the diameter of the light rod is smaller than the inner diameter of the head thread. The kirschner wire can be used for pressurizing and fixing a fracture surface, but the metal can not be taken out of the body after operation, and the kirschner wire is not suitable for fixing a small fracture block because the diameter of the kirschner wire is larger to ensure the structural strength when the kirschner wire is designed to be complex.

And application number 2009202260915's chinese patent provides the spacing kirschner wire of snap ring, by the kirschner wire somatic part, snap ring and afterbody are constituteed, 4cm departments of kirschner wire needle tail are equipped with the cell type and are defective, pre-install the snap ring that has the diameter to be 2 times of kirschner wire, put into suitable position with the spacing kirschner wire of snap ring after, cut the kirschner wire in about 2 ~ 3mm departments outside the snap ring, the needle tail can be buried in internally, can avoid the kirschner wire to remove in the human body, the afterbody can be cut short. However, the design can only limit the inward movement of the kirschner wire along the longitudinal axis, but can not limit the outward movement of the kirschner wire along the longitudinal axis; meanwhile, if the clamping ring is used for treating the ulna coronary protrusion type II, the clamping ring can not be broken by hands, the intervention of larger instruments is still needed during the breaking, and the kirschner wire still needs to be screwed out along the original operation approach when the internal fixation is taken out after the fracture is healed, so that the secondary damage to a patient is large.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel half screw thread kirschner wire can break to solve the problem that exists among the above-mentioned prior art, satisfy among the bone surgery firmly fixed needs to the ossicle in the joint.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a breakable half-thread Kirschner wire comprises a Kirschner wire proximal smooth rod part, a breakable joint part, a Kirschner wire distal end thread part and a Kirschner wire tip part, wherein the diameters of the Kirschner wire proximal smooth rod part and the Kirschner wire distal end thread part are consistent in external diameter; the threads of the thread part at the far end of the Kirschner wire are uniformly distributed, and the outer diameter, the thread pitch and the depth of the threads are kept consistent; the joint of the Kirschner wire proximal end polished rod part and the Kirschner wire distal end thread part is a breakable joint part.

Preferably, the breakable joint part is a horizontal annular groove, the depth of the groove is 0.15mm, the depth of the groove is greater than the thread depth of the thread part at the distal end of the kirschner wire, and the kirschner wire can be broken at the position by hands through mechanical tests.

Preferably, the length of the distal thread part of the Kirschner wire is more than or equal to 60mm, and the distal thread part can penetrate through the cortical bone on the opposite side of the fracture block.

The utility model discloses a can break half screw ke shi needle is preferred to be applied to the operation treatment of the II type fractures of ulna guan tu, but is applicable to the fixed of the middle and small fracture piece in other types of fracture equally.

The utility model has the advantages that: the design of the thread ensures that the breakable half-thread Kirschner wire can be firmly and reliably fixed on the small bone block, avoids slippage and displacement and is beneficial to the early functional exercise of the joint; the groove design of the breakable joint part simplifies the breaking operation of the Kirschner wire, does not need the intervention of a larger instrument, avoids the peeling of soft tissues in a large range, and further avoids the operation complications such as pain, bleeding, infection, adhesion, neurovascular injury and the like to the maximum extent; the design of the long thread enables the breakable half-thread Kirschner wire to penetrate out from the cortex of the opposite side after the small bone fracture block is fixed and be bent and buried under the skin, so that the daily life of washing, dressing and the like is not influenced, the Kirschner wire can be taken out from the cortex of the opposite side after the fracture is healed, the operation is safe and convenient, and the secondary operation injury caused by the approach of the original incision is avoided; in addition, the Kirschner wire is low in price, so that the economic burden of a patient is remarkably reduced.

Drawings

FIG. 1 is a schematic view of a breakable half-thread Kirschner wire of the present invention;

FIG. 2 is a schematic view of an intraoperative surgical site of an embodiment of the present invention;

fig. 3 is a schematic view of the surgical site after operation according to the embodiment of the present invention.

In the figure, 1, a proximal smooth rod part of the kirschner wire, 2, a breakable joint part, 3, a distal threaded part of the kirschner wire, 4, a tip part of the kirschner wire, 5, a small fracture block, 6, a fracture line, 7, a lateral cortex, 8, skin and 9, a bent part of the kirschner wire.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the embodiments of the present invention and the accompanying drawings, and it is to be understood that the described embodiments are only some of the preferred embodiments of the present invention, but not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): as shown in fig. 1, the breakable half-thread kirschner wire comprises a proximal kirschner wire proximal smooth rod part 1, a breakable joint part 2, a kirschner wire distal thread part 3 and a kirschner wire tip part 4. The diameter of the Kirschner wire proximal smooth rod part 1 is consistent with the outer diameter of the Kirschner wire distal thread part 3. The thread pitches of the distal end thread part 3 of the Kirschner wire are equal, and the outer diameters and the depths of the threads are consistent. The length of the distal thread part 3 of the Kirschner wire is more than or equal to 60mm, so that the Kirschner wire can penetrate through cortical bone 7 on the opposite side of the fracture block 5. The connecting part of the Kirschner wire proximal smooth rod part 1 and the Kirschner wire distal thread part 3 is a breakable joint part 2 which is a horizontal annular groove, and the depth of the groove is 0.15mm which is larger than the thread depth of the Kirschner wire distal thread part 3.

The utility model discloses but half screw thread kirschner wire of rupture is preferred to be applied to the operation treatment of the II type fractures of ulna guan tu, but is applicable to the fixed of the middle and small fracture piece in other types of fractures equally.

Referring to fig. 2 and 3, the operation is as follows: firstly, cutting the skin to expose an ulna coronary fracture block 5 and a fracture line 6; the ulna coronal process fracture block 5 is well restored and then is directly and slowly driven into the distal end thread part 3 of the breakable half-thread kirschner wire from front to back until the groove 2 at the breakable joint reaches the top of the ulna coronal process 5; then breaking off the Kirschner wire at the groove 2 by bare hand; bending the distal thread part 3 of the Kirschner wire penetrating out of the lateral cortical bone 7 from the ulna coronal process to form a bending part 9, and burying the bending part under the skin 8; finally, the suture incision is closed. After the fracture heals, a small incision with the length of about 1cm is made on the bending part 9 of the kirschner wire on the back side of the ulna, and the kirschner wire is screwed out.

In the operation process, only a small operation space which can meet the requirement of reduction is required, and peripheral soft tissues do not need to be stripped in a large area, so that the damage to important blood vessel nerves at the elbow is avoided; the distal end thread part 3 of the Kirschner wire is driven in under direct vision, so that the one-time success rate is high; the distal thread part 3 of the kirschner wire ensures the firm fixation of the ulna coronal fracture block 5, avoids the slippage and the displacement, and is beneficial to the early functional exercise of the elbow joint. The operation of taking the needle is also simple and easy to operate, the needle does not need to enter through the original operation incision in the front of the elbow, the secondary injury to soft tissues such as the blood vessel nerve in the front of the elbow is avoided, the wound is small, and the pain of a patient is greatly relieved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A half-thread kirschner wire capable of being broken is characterized in that: the Kirschner wire distal end connecting rod comprises a proximal Kirschner wire proximal end polished rod part (1), a breakable joint part (2), a Kirschner wire distal end thread part (3) and a Kirschner wire tip part (4), wherein the diameter of the Kirschner wire proximal end polished rod part (1) is consistent with the outer diameter of the Kirschner wire distal end thread part (3); the thread pitches of the distal end thread part (3) of the Kirschner wire are all equal, and the outer diameter, the thread pitch and the depth of the thread are all consistent; the joint of the Kirschner wire near-end polished rod part (1) and the Kirschner wire far-end thread part (3) is a breakable joint part (2).

2. The breakable half-thread k-wire according to claim 1, wherein: the breakable joint part (2) is a horizontal annular groove, the depth of the groove is 0.15mm, the depth of the groove is greater than the thread depth of the thread part (3) at the far end of the Kirschner wire, and the Kirschner wire can be broken by using the groove by hand.

3. The breakable half-thread k-wire according to claim 1, wherein: the length of the distal thread part (3) of the Kirschner wire is more than or equal to 60mm, and the distal thread part can sufficiently penetrate through cortical bone on the opposite side of the fracture block.