CN216570174U

CN216570174U - Expansion compression screw for femoral neck fracture

Info

Publication number: CN216570174U
Application number: CN202121746405.1U
Authority: CN
Inventors: 董凯旋; 周娅; 李宏键; 陆声; 徐永清
Original assignee: First Peoples Hospital of Yunnan Province
Current assignee: First Peoples Hospital of Yunnan Province
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-05-24
Anticipated expiration: 2031-07-29

Abstract

The utility model discloses an expansion compression screw for femoral neck fracture, which is characterized by comprising: the outer screw, the inner main screw, the guider and the pusher; the inner main nail is detachably connected to the outer screw, the guide device is detachably sleeved at the top of the outer screw, the pusher is detachably connected to the inner cavity of the outer screw, and the pusher and the inner main nail do not act on the outer screw at the same time; this screw abandons traditional structural modeling, adopts the form of outer screw with inside main nail, and outer screw is provided with the opening at its end, and head end twist sclerotin can form certain shrink in the in-service use in-process, and inside main nail is twisted in by outer screw this moment and is propped open its outer screw end contraction part from inside, realizes the inflation pressurization of outer screw, so compare in traditional set screw, and it is more firm to fix, difficult emergence is become flexible to break away from, can effectively not avoid unnecessary troublesome.

Description

Expansion compression screw for femoral neck fracture

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to an expansion compression screw for a femoral neck fracture.

Background

Femoral neck fractures often occur in the elderly, and the incidence of the fractures gradually increases with the life of the elderly, and especially with the aging population, the fractures become a serious social problem. Two main problems of fracture nonunion and avascular necrosis of femoral head exist in clinical treatment. To date, many unsolved problems remain in many aspects such as treatment and outcome of femoral neck fractures.

The fracture of the old has two basic factors, the strength of osteoporosis bone is reduced, and the blood nourishing tube holes in the upper area of the femoral neck are densely distributed, so that the biomechanical structure of the femoral neck can be weakened, and the femoral neck is fragile. In addition, the aged hip peripheral muscle group degenerates and reacts slowly, so that the harmful stress of the hip cannot be effectively counteracted, and the hip is subjected to larger stress (2-6 times of body weight) and has complicated and variable local stress, so that no great violence is needed, such as flat slip, falling from the bed or sudden torsion of the lower limbs, and even the fracture can be generated without obvious trauma. The fracture of femoral neck in young and old years is often caused by serious injuries such as traffic accidents or high fall. If the patient is over-stressed for a long time and is working or walking, the patient gradually becomes fractured, which is called fatigue fracture.

At present, screws used in fixation of femoral neck fracture in clinic are common fixing screws in the prior art, the screws are easy to loosen in the fixation process, the unstable fixation condition of two ends of fracture is easy to occur, the quality of fracture fixation of the screws is affected, the whole fracture treatment rehabilitation process is unnecessarily troublesome due to the loosening of the fixing screws in clinic, unnecessary pain is caused to patients, and later-stage rehabilitation is inconvenient.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model designs an expansion compression screw for femoral neck fracture, which abandons the traditional structural shape and adopts the form of an outer screw and an inner main screw, wherein the end head of the outer screw is provided with an opening, the head end of the outer screw is screwed into bone to form certain contraction in the actual use process, and the inner main screw is screwed into the outer screw to expand the contraction part of the end head of the outer screw from the inside so as to realize the expansion compression of the outer screw; meanwhile, the outer screw is provided with threads with different thread pitches, two ends of which are not connected, the threads at the two ends are respectively screwed into two ends of a fracture part, when the outer screw is rotated by the same angle, the thread displacement distances at the two ends are different, one end moves fast, the other end moves slowly, the fast end moves to extrude the slow end, the spiral pressurization at the two ends of the fracture is realized, compared with the traditional fixing screw, the two ends of the fracture can be tightly extruded together, the fixing effect is better, and the recovery treatment of the fracture part is facilitated; secondly, the outer screw of the device also plays a role of a catheter, and the inner cavity of the outer screw can be injected with the medicine required by fracture treatment, so that the medicine can be pushed in more conveniently and more quickly, and the efficiency of the operation can be improved; finally, the device is provided with the director, makes things convenient for the propelling movement of inside main nail and medicine, for whole operation process provides convenience, helps the promotion of operation efficiency, can effectively solve the problem of the inconvenient operation of the deep-seated human body of set screw in the operation.

In order to achieve the technical effects, the utility model is realized by the following technical scheme: an expansion compression screw for femoral neck fractures comprising: the outer screw, the inner main screw, the guider and the pusher;

the inner main nail is detachably connected to the outer screw, the guide is detachably sleeved on the top of the outer screw, the pusher is detachably connected to the inner cavity of the outer screw, and the pusher and the inner main nail do not act on the outer screw at the same time;

furthermore, the outer screw is divided into a T-shaped cap and a threaded column, the threaded column is fixedly connected to the bottom of the T-shaped cap, a first hexagonal groove is formed in the T-shaped cap, a rectangular groove is formed in the lower end of the threaded column, first threads and second threads are respectively arranged at the upper end and the lower end of the outer surface of the threaded column, and a threaded hole is formed in the inner cavity of the outer screw; the inner main nail is detachably connected in the threaded hole, and the guider is detachably sleeved in the first hexagonal groove;

further, the first thread and the second thread are not connected, and the thread pitches of the first thread and the second thread are different;

furthermore, a second hexagonal groove is formed in the upper end of the inner main nail, and a thread is formed in the lower end body of the inner main nail;

further, the guider is divided into an upper guiding sleeve and a lower hexagonal joint, and the guiding sleeve is fixedly connected above the hexagonal joint; the guider is detachably sleeved in the first hexagonal groove through a hexagonal joint;

furthermore, a holding handle is arranged at the top end of the pusher;

the beneficial effects of this utility are:

1. the screw abandons the traditional structural shape, adopts the form of an outer screw and an inner main screw, the end head of the outer screw is provided with an opening, the head end is screwed into bone to form certain contraction in the actual use process, at the moment, the inner main screw is screwed into the outer screw to prop the contraction part of the end head of the outer screw from the inside, the expansion and pressurization of the outer screw are realized, and compared with the traditional fixing screw, the screw is more stable in fixation, is not easy to loosen and separate, and can effectively avoid unnecessary troubles;

2. the outer screw is provided with threads with different pitches, two ends of which are not connected, the threads at the two ends are respectively screwed into two ends of a fracture part, when the outer screw is rotated by the same angle, the displacement distances of the threads at the two ends are different, one end of the outer screw moves fast, the other end of the outer screw moves slow, the fast end moves to extrude the slow end, the spiral pressurization of the two ends of the fracture is realized, compared with the traditional fixing screw, the two ends of the fracture can be tightly extruded together, the fixing effect is better, and the recovery treatment of the fracture part is facilitated;

3. the outer screw of the device also plays a role of a catheter, and the inner cavity of the outer screw can be injected with the medicine required by fracture treatment, so that the medicine can be pushed in more conveniently and more quickly, and the efficiency of the operation can be improved;

4. the device is provided with the director, makes things convenient for the propelling movement of inside main nail and medicine, for whole operation process facilitates, helps the promotion of operation efficiency, can effectively solve the problem of the inconvenient operation of the setscrew deep-seated human body in the operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of an expansion compression screw for femoral neck fracture:

FIG. 2 is a schematic view of the assembly structure of the external screw and the internal main screw of the expansion compression screw for femoral neck fracture:

FIG. 3 is a sectional structure diagram of the external screw and the internal main screw A-A of the expansion compression screw for femoral neck fracture:

fig. 4 is a schematic view of an external screw for an expansion compression screw used at a femoral neck fracture and an auxiliary structure thereof:

fig. 5 is a schematic view of a guide for an expansion compression screw used at a femoral neck fracture and its attached structure:

FIG. 6 is a schematic view of a pusher for an expandable compression screw for use in a femoral neck fracture and its accompanying structure:

in the drawings, the components represented by the respective reference numerals are listed below:

1-external screw, 101-t-cap, 102-threaded post, 103-first hexagonal groove, 104-rectangular groove, 105-first thread, 106-second thread, 107-threaded hole, 2-internal main screw, 201-second hexagonal groove, 3-guide, 301-guide sleeve, 302-hexagonal joint, 4-pusher.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1 to 6, an expansion compression screw for femoral neck fracture, comprising: the outer screw 1, the inner main screw 2, the guider 3 and the pusher 4;

the inner main nail 2 is detachably connected to the outer screw 1, the guider 3 is detachably sleeved at the top of the outer screw 1, the pusher 4 is detachably connected to the inner cavity of the outer screw 1, and the pusher 4 and the inner main nail 2 do not act on the outer screw 1 simultaneously; the screw abandons the traditional structural shape, adopts the form of an outer screw 1 and an inner main screw 2, the end head of the outer screw 1 is provided with an opening, the head end is screwed into bone to form certain contraction in the actual use process, at the moment, the inner main screw 2 is screwed into the outer screw 1 to prop the contraction part of the end head of the outer screw 1 from the inside, the expansion and pressurization of the outer screw 1 are realized, and compared with the traditional fixing screw, the screw is more stable in fixation, is not easy to loosen and separate, and can effectively avoid unnecessary troubles;

the outer screw 1 is divided into a T-shaped cap 101 and a threaded column 102, the threaded column 102 is fixedly connected to the bottom of the T-shaped cap 101, a first hexagonal groove 103 is formed in the T-shaped cap 101, a rectangular groove 104 is formed in the lower end of the threaded column 102, first threads 105 and second threads 106 are respectively formed in the upper end and the lower end of the outer surface of the threaded column, and a threaded hole 107 is formed in the inner cavity of the outer screw 1; the inner main nail 2 is detachably connected in the threaded hole 107, and the guider 3 is detachably sleeved in the first hexagonal groove 103; the rectangular groove 104 is arranged to provide a pulling space for the end head of the outer screw 1, so that the outer screw can be conveniently expanded, pressurized and fixed; meanwhile, the rectangular groove 104 is designed to facilitate the medicine to be dispersed when the medicine is pushed to the bone, so that the medicine can fully act on the bone;

the first thread 105 and the second thread 106 are not connected, and the pitches of the first thread 105 and the second thread 106 are different; the threads at two ends are respectively screwed into two ends of the fracture part, the same angle of rotating the external screw is that the displacement distances of the threads at the two ends are different, one end moves the block, the other end moves slowly, the fast end moves and extrudes the slow end, so that the spiral pressurization at the two ends of the fracture is realized, compared with the traditional fixing screw, the screw can tightly extrude the two ends of the fracture together, the fixing effect is better, and the recovery treatment of the fracture part is facilitated; the space is arranged between the threads at the two ends, and the threads do not interfere with the pressing of the fracture interface at the position of the fracture interface, so that the fixation quality of the fracture interface is better;

the upper end of the inner main nail 2 is provided with a second hexagonal groove 201, and the lower end body of the inner main nail is provided with threads which are detachably connected with the inner cavity of the outer screw in a threaded fit manner;

the guider 3 is divided into two parts, namely an upper guiding sleeve 301 and a lower hexagonal joint 302, and the guiding sleeve 301 is fixedly connected above the hexagonal joint 302; the guider 3 is detachably sleeved in the first hexagonal groove 103 through a hexagonal joint 302; the guider 3 is guided to the outer end of the human body from the outer screw 1T-shaped cap 101, the pusher 4 and the inner main screw 2 enter the inner cavity of the outer screw 1 from the inner cavity of the guider 3, convenience is provided for the whole operation process, the improvement of the operation efficiency is facilitated, and the problem that the operation is inconvenient when the fixing screw is deeply sunk into the human body in the operation can be effectively solved.

A holding handle 401 is arranged at the top end of the pusher 4 and is used for operating the pusher 4 to carry out medicine delivery operation;

the device specifically comprises the following steps:

1. the whole device is disinfected and cleaned.

2. Under the guiding action of the Kirschner wire, the outer screw 1 is firstly driven in.

3. The guide 3 is sleeved on the top end of the outer screw 1.

4. The drug is infused from the lumen of its guide 2.

5. The pusher 4 is inserted into the inner cavity of the guider 3 to push the medicine to the end of the outer screw 1.

6. The pusher 4 is pulled out and the inner main nail 2 is inserted into the outer screw 1 in the guide 3.

7. The inner primary nail 2 is tightened.

In conclusion, the screw 1 abandons the traditional structural shape, adopts the form of an outer screw and an inner main screw, the end head of the outer screw is provided with an opening, the head end is screwed in bone to form certain contraction in the actual use process, and the inner main screw is screwed in the outer screw to expand the contraction part of the end head of the outer screw from the inside, so that the expansion and pressurization of the outer screw are realized, and compared with the traditional fixing screw, the screw is more stable in fixation, is not easy to loosen and separate, and can effectively avoid unnecessary troubles;

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An expansion compression screw for femoral neck fractures comprising:

the outer screw, the inner main screw, the guider and the pusher;

inside main nail detachable connects on outer screw, removable the cup jointing of director is at outer screw top, pusher detachable connects at the outer screw inner chamber, pusher does not act on outer screw with inside main nail simultaneously.

2. The expansion compression screw for femoral neck fractures as claimed in claim 1, wherein the outer screw is divided into a nut and a threaded post, the threaded post is fixedly connected to the bottom of the nut, the nut is provided with a first hexagonal groove, the lower end of the threaded post is provided with a rectangular groove, the upper end and the lower end of the outer surface of the threaded post are respectively provided with a first thread and a second thread, and the inner cavity of the outer screw is provided with a threaded hole; inside main nail detachable connects in this screwed hole, and director detachable cup joints in first hexagonal recess.

3. The expansion compression screw for a femoral neck fracture of claim 2, wherein the first thread is unconnected to the second thread and the first thread and the second thread have different pitches.

4. The expansion compression screw for femoral neck fractures according to claim 2, wherein the inner main screw is provided with a second hexagonal groove at the upper end and a screw thread at the lower end.

5. The expansion forcing screw for femoral neck fractures according to claim 2, wherein the guide is divided into an upper guide sleeve and a lower hex joint, the guide sleeve being fixedly connected above the hex joint; the guider is detachably sleeved in the first hexagonal groove through the hexagonal joint.

6. The expansion compression screw for femoral neck fractures according to claim 1, wherein a holding handle is provided at the top end of the pusher.