CN219397536U - Femur lesser trochanter bone block reset screw - Google Patents

Abstract

The utility model discloses a femur lesser trochanter bone block reset screw which comprises a main nail penetrating through a femur head, wherein a guide hole is axially formed in the main nail, a traction reset needle is sleeved in the guide hole, one end of the traction reset needle is provided with a broken bone fixing mechanism for fixing the femur lesser trochanter bone block, the other end of the traction reset needle is fixed on the outer side of the femur, and a driving mechanism of the traction reset needle is arranged for controlling the traction reset needle. The product can achieve the function of traction and reduction because the internal fixator is not required to cut large-area tissues when being inserted into a body, thereby shortening the reduction time of broken bones and relieving the pain of patients.

Description

Femur lesser trochanter bone block reset screw

Technical Field

The utility model relates to a medical apparatus, in particular to a femur lesser trochanter bone block reset screw.

Background

Intertrochanteric fractures of the femur are one of the most common fractures, and a commonly used treatment method is intramedullary nail (PFNA) cross fixation, and then bone screws are implanted at the fracture to fix two sections of fractured bones, which has the problems that: 1. the partial blood circulation of the bone comes from periosteum and surrounding soft tissue, and despite careful handling during surgery, the peeling of soft tissue from periosteum inevitably damages blood circulation, causing delayed healing, even non-healing. 2. When bone screws are implanted from the outside to the inside of the femoral head part, nerve distribution is dense, and nerve damage can be caused. 3. At present, the reduction of the fracture of the lesser trochanter of the femur is mostly carried out by adopting non-reduction or stranded reduction fixation by a titanium cable and a steel wire, wherein the non-reduction leads to the lesser trochanter of the patient to be easily free to shift under the traction of adductor muscles, leads to poor fracture reduction and insufficient supporting strength of an inner side arm, and leads to fracture fixation failure easily; the titanium cable and the steel wire are stranded and fixed, the operation is difficult due to the blocking of local muscle tissues, the local nerve vascular tissues are more, the combined damage is easy to cause, the operation difficulty and the risk are increased, and the titanium cable and the steel wire are stranded and fixed, so that the fixing effect is influenced due to poor fixing strength and the resetting effect. 4. More serious, if the position is not reset to the ideal position, a secondary reset operation is necessary in the rehabilitation process, so that the infection chance is increased. The secondary operation tends to increase local injury, influence blood circulation, further reduce local tissue resistance and make bacteria more easily grow and multiply in the incision. Once infection occurs, the consequences are serious, which not only bring unnecessary pain to wounded, but also may cause disability.

Disclosure of Invention

The utility model aims to provide a femur lesser trochanter bone block resetting screw which is simple and rapid and is reliable in resetting.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a femur lesser trochanter bone piece reset screw, includes the main nail that runs through the femoral head, along the guiding hole of axial setting in the main nail, the cover is equipped with the traction reduction needle in the guiding hole, the one end of traction reduction needle sets up broken bone fixed establishment for fixed one femur lesser trochanter bone piece, the other end is fixed in the femur outside, and sets up the actuating mechanism of traction reduction needle for control traction reduction needle.

Further, the broken bone fixing mechanism comprises N inverted teeth and a hole groove of the head of the main nail, wherein the N inverted teeth and the hole groove of the head of the main nail are arranged at one end of the traction reset needle, the inverted teeth are matched with the hole groove of the head of the main nail, and the inverted teeth can radially stretch and retract along the traction reset needle; the driving mechanism comprises threads arranged in an inner hole of the main nail and a pressure regulating jackscrew screwed into the threads, and the rotating pressure regulating jackscrew can push the traction reset needle 1 to move forward.

As a further refinement of the utility model, the tooth extends axially along the pull-reset needle.

As another form of the utility model, the broken bone fixing mechanism is a thread for pulling the head part of the reset needle; the driving mechanism comprises an adjusting nut which is in threaded connection with the traction reset needle.

In addition, as a further optimization of the utility model, the method also comprises a guide pin which is firstly implanted on the broken bone.

Compared with the prior art, the utility model has the beneficial effects that: 1. because the internal fixator is inserted into the body without cutting large-area tissues, the damage and infection to the blood circulation of wounded are avoided, and the adhesion between soft tissues or between the soft tissues and bones is also avoided, namely the minimally invasive operation is realized; 2. the design adopts the mode of matching the main nail and the traction fixing nail, namely the femur lesser trochanter bone block is fixed, and the traction adjustment is carried out by the adjusting mechanism, so that the traction and reduction effect is achieved, the bone fracture reduction time is shortened, and the pain of a patient is relieved; 3. because the design of the traction needle is tiny, the wound on the femur is also relatively reduced, thereby further reducing the tissue injury; 4. the structure is simple, the operation is easy, and the workload of doctors is reduced. 5. The traction needle can be regulated by the regulating device so as to lead the bone block to be reset, and secondary operation is not needed even if the bone block is reset for a plurality of times, thereby greatly reducing the risk of infection and the pain of patients.

Drawings

FIG. 1 is a schematic view of a pulling reset needle according to a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of a first embodiment of the present utility model;

FIG. 3 is a diagram showing the state of use of the retracting needle according to the second embodiment of the present utility model;

FIG. 4 is a diagram showing another use state of the pulling reset needle according to the second embodiment of the present utility model;

in the figure, 1, a traction reset needle, 2, a main nail, 3, inverted teeth, 4, a first bone block, 5, a second bone block, 6, a guide needle, 7, a pressure-regulating jackscrew and 8, an adjusting nut.

Detailed Description

Embodiments of the present utility model will be described in further detail below with reference to fig. 1 to 4:

the embodiment is a femur lesser trochanter bone block reset screw, as shown in fig. 1-2, comprising a main nail 2 penetrating through broken bones, a guide hole axially arranged in the main nail 2, a traction reset needle 1 sleeved in the guide hole, one end of the traction reset needle 1 provided with a broken bone fixing mechanism for fixing one broken bone, the other end of the traction reset needle located on the other broken bones, and a driving mechanism of the traction reset needle 1 for moving the traction reset needle 1.

The broken bone fixing mechanism comprises a pawl 3 and a hole groove at the head of the main nail 2, wherein the pawl 3 is arranged at one end of the traction reset needle 1, the pawl 3 is matched with the hole groove at the head of the main nail 2, and the pawl 3 can radially stretch and retract along the traction reset needle 1; the driving mechanism comprises threads arranged in an inner hole of the main nail 2 and a pressure regulating jackscrew 7 screwed into the threads, and the rotating pressure regulating jackscrew 7 can push the traction reset needle 1 to move forward.

The specific use mode is as follows: the first bone block 4 and the second bone block 5 are injuries and fractures on the inner side of the femoral head, and the second bone block 5 is measured internally. Firstly, a guide pin 6 is implanted, the guide pin passes through a first bone block 4 and a second bone block 5, a main nail 2 passes through the second bone block 5 along the guide pin 6, the guide pin 6 is taken out after the first bone block 4 is implanted, the guide pin penetrates into a traction reset needle 1 along the inner hole of the main nail 2, the head of the traction reset needle 1 is an umbrella-shaped inverted tooth 3, the inner hole of the main nail 2 is screwed into a pressure regulating jackscrew 7, the pressure regulating jackscrew 7 is rotated so as to move forward against the traction reset needle 1, and when the head reaches the top end, the inverted tooth 3 of the traction reset needle 1 is matched with a hole groove of the head of the main nail 2, and the inverted tooth 3 is ejected out so as to better fix the first bone block 4, and avoid falling off in the traction reset process.

The difference between the second embodiment and the first embodiment is that, as shown in fig. 3 to 4, a guide pin 6 is first implanted on the first bone block 4 and the second bone block 5 to pass through the first bone block 4 and the second bone block 5, the main nail 2 is implanted according to the guide pin 6 to fix the guide pin on the second bone block 5, the traction reduction needle 1 is threaded along the inner hole of the main nail 2, the tail end of the traction reduction needle 1 is in threaded fit with the adjusting nut 8, the head of the traction reduction needle 1 is fixed on the first bone block 4, and the adjusting nut 8 is rotated, so that the traction reduction needle 1 drives the first bone block 4 to perform reduction traction.

It is obvious that the above examples are given solely for the purpose of clearly illustrating the utility model and are not to be construed as limiting the embodiments of the utility model, and that other variants and modifications may be made by those skilled in the art based on the above description. It is not necessary here nor is it exhaustive of all embodiments. While remaining within the scope of the utility model, obvious variations or modifications are incorporated by reference herein.

Claims (5)

1. The utility model provides a femur lesser trochanter bone piece reset screw which characterized in that, includes the main nail that runs through the femoral head, along the guiding hole that axial set up in the main nail, the cover is equipped with the traction reduction needle in the guiding hole, the one end of traction reduction needle sets up broken bone fixed establishment for fixed femur lesser trochanter bone piece, the other end is fixed in the femur outside, and sets up the actuating mechanism of traction reduction needle for control traction reduction needle.

2. The femur lesser trochanter bone block reduction screw according to claim 1, wherein the bone fracture fixation mechanism comprises N inverted teeth provided at one end of the traction reduction needle, and a hole groove of the head of the main nail, the inverted teeth are mutually matched with the hole groove of the head of the main nail, and the inverted teeth are radially retractable along the traction reduction needle; the driving mechanism comprises threads arranged in an inner hole of the main nail and a pressure regulating jackscrew screwed into the threads, and the rotating pressure regulating jackscrew can push the traction reset needle (1) to move forward.

3. The femoral lesser trochanter bone block reduction screw of claim 2, wherein the inverted tooth extends axially along the pull reduction needle.

4. The femoral lesser trochanter bone block reduction screw of claim 1 wherein said fracture fixation mechanism is a thread pulling the reduction pin portion; the driving mechanism comprises an adjusting nut which is in threaded connection with the traction reset needle.

5. The femoral lesser trochanter bone block reduction screw of any of claims 1-3, further comprising a lead that is first implanted on a fractured bone.