CN213372403U - Double-thread type rear-crossing ligament fixer - Google Patents

Abstract

The utility model relates to a medical instrument that implanted surgery location or reset, concretely relates to intercrossed ligament fixer behind two screw thread formulas, including screw, dead lever and nut, the dead lever include cylinder section and screw rod section, the screw rod section is connected in cylinder section below, the nut is connected in the screw rod section, the cylinder section in be equipped with the internal thread, the screw connection in the internal thread of cylinder section, simple structure, reduction patient's pain sense, convenient to use, reduction operation degree of difficulty and time.

Description

Double-thread type rear-crossing ligament fixer

Technical Field

The utility model relates to an implantable medical device for surgical positioning or resetting, in particular to a double-thread type rear crossed ligament fixer.

Background

The posterior cruciate ligament is an important structure for maintaining the stability of the knee joint, the fracture injury of the tibial insertion point of the posterior cruciate ligament can directly cause the backward and rotational instability of the knee joint, the degenerative deformation of the knee joint is caused, traffic accidents frequently occur along with the increase of traffic flow on roads, so the probability of the injury of the posterior cruciate ligament is obviously increased, common operations mostly adopt larger incisions and cooperate with screws and sutures to fix fracture blocks, the operation wound is large, blood vessels and nerves at the rear part of the knee joint are rich in distribution, the injury is easily caused, and the difficulty in clinical treatment is very large.

The patent numbers are: 201710477448.6 discloses a posterior cruciate ligament tibia insertion avulsion fracture fixation steel plate (hereinafter referred to as fixation steel plate), which comprises: the bone plate is provided with a U-shaped pressing plate, the bending part of the U-shaped pressing plate covers the periphery of the front part of the tibial insertion point of the posterior cruciate ligament, two sides of the U-shaped pressing plate are respectively provided with an outward extending lug, and the lower surface of each lug is a curved surface matched with the surface of a bone covered by the lug; the middle part of the lug is provided with a screw hole, and the axis of the screw hole points to the anterior cortical bone of the upper section of the tibia; a thread tying hole is respectively arranged at the position of each side edge of the U-shaped pressing plate.

From the above-mentioned structure, this fixed steel sheet has the following 3 aspects's problem:

1. the physiological structure of the posterior cruciate ligament of the human body is not considered structurally, the influence on nerves and blood vessels around bones is large, and after the fixing steel plate is implanted into the human body, the foreign body sensation of a patient is large, so that the movement of the patient is inconvenient;

2. the screws and the sutures are adopted for auxiliary fixation, and the screws and the sutures are taken out after the affected bones are healed, so that secondary damage to the bones can be caused;

3. the used product has more accessories, which results in long operation time and large operation difficulty;

for the three reasons, the existing fixed steel plate has the defects.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems existing in the prior art, the utility model aims to provide a double-thread type back-crossing ligament fixer which has simple structure, reduces pain of patients, is convenient to use, reduces operation difficulty and time and solves the problems existing in the prior art.

The utility model adopts the technical proposal that: the utility model provides a criss-cross ligament fixer behind two screw formulas, includes screw, dead lever and nut, the dead lever include cylinder section and screw rod section, the screw rod section is connected in cylinder section below, the nut is connected on the screw rod section, the cylinder section in be equipped with the internal thread, screw connection is in the internal thread of cylinder section.

The screw is a countersunk screw, the upper end surface of the head of the screw is a plane, and two grooves are symmetrically arranged on the outer edge of the plane.

Further the screw bottom be equipped with the direction section, the direction section for the obconic shape, conical top is the arc surface.

Furthermore, the joint of the cylindrical section and the screw section is smoothly transited through an arc.

Further, the screw and the fixing rod are made of titanium alloy or pure titanium materials.

Further, the nut is made of titanium alloy or medical stainless steel materials.

The utility model has the advantages that:

1. the utility model has small and simple structure, fully considers the physiological structure of the posterior cruciate ligament of the human body, has lower influence on the human body, reduces the foreign body sensation of the patient due to smaller body size, ensures the normal action of the patient and effectively reduces the pain sensation of the patient;

2. the utility model has small wound surface of the patient when in use, and light burden to the patient, and can not cause unnecessary secondary damage to the patient when the patient is disassembled after recovery;

3. the utility model discloses convenient to use, it is convenient to install, dismantle, reduces the operation time and the degree of difficulty, and the result of use is better.

Drawings

FIG. 1 is a schematic view of the appearance structure of the present invention;

fig. 2 is a schematic view of the usage state of the present invention.

In the figure: 1. the screw comprises a screw body, a groove, a guide section, a fixing rod, a cylindrical section, a screw rod section, a nut, a tibia and a fracture block, wherein the screw body comprises 101, the groove, 102, the guide section, 2, the fixing rod, 201, the cylindrical section, 202, the screw rod section, 3, the nut, 4, the tibia and 5.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments:

a double-thread type rear crossed ligament fixator comprises a screw 1, afixing rod 2 and anut 3, wherein thefixing rod 2 comprises acylindrical section 201 and ascrew section 202, thescrew section 202 is connected below thecylindrical section 201, thenut 3 is connected on thescrew section 202, an internal thread is arranged in thecylindrical section 201, the screw 1 is connected in the internal thread of thecylindrical section 201, holes are drilled in a fracture block and a tibia of a patient to ensure that the drilled holes are on the same central line, thefixing rod 2 is arranged in the drilled holes in the tibia, the fracture block is clamped between thecylindrical sections 201 through the screw 1, thescrew 3 is connected with thescrew section 202, the fracture block is tightly attached to the tibia through thenut 3, and the redundant part of thescrew section 202, which extends out of thenut 3, is sawed off, so that stable fixation of the fracture block can be ensured, influences on nerves and blood vessels around the bone can be reduced as much as possible, and meanwhile, installation is carried out, The disassembly process is very simple, the operation time and the operation risk are reduced, and the foreign body sensation of a patient is reduced.

Further screw 1 be countersunk screw, 1 head up end of screw be the plane, plane outer fringe symmetry is equipped with tworecesses 101, utilizes countersunk screw head's characteristic, lets 1 whole sunken fracture piece in, makes fracture piece surface comparatively level and smooth, reduces patient foreign body and feels, makes things convenient for patient's activity to utilize tworecesses 101 to accomplish the work of screwing up and unscrewing to the screw, let the screw upper surface guarantee level and smooth as far as, be of value to the patient and demolish the utility model discloses the clearance of time surface.

Further 1 bottom of screw be equipped withguide section 102,guide section 102 for the obround shape, conical top is the arc surface, can make things convenient for the connection of screw 1 andcylinder section 201 through utilizingguide section 102 to can not cause secondary damage to the affected part.

Further, the joint of thecylindrical section 201 and thescrew section 202 is smooth and excessive through an arc, so that the cylinder section is beneficial to being close to a skeleton physiological structure after being installed, and secondary damage to a skeleton tissue can not be caused.

The screw 1 and thefixing rod 2 are made of titanium alloy or pure titanium materials, thenut 3 is made of titanium alloy or medical stainless steel materials, and the titanium alloy or pure titanium materials are adopted to ensure biocompatibility better.

When in use, the patient is anesthetized at the operation position of the patient, the patient is recommended to adopt a supine position, then an incision is made at the operation position of the patient, a PCL tibial tunnel positioner is inserted from the front inner side, a kirschner wire is drilled from the inner side of a 4-section tibia to the rear side of the tibia, the lower part of a fracture bed is torn off, then the positioner is used for pre-resetting afracture block 5, thefracture block 5 is fixed and does not move, the diseased bone is exposed by stripping tissues, a special drill is used for drilling to ensure fracture, thefracture 5 and the tibia 4 are drilled on a central line, a screw 1 is inserted into the bone tunnel from thefracture block 5, afixing rod 2 is inserted into the bone tunnel from the other side, after reaching the position, the screw 1 is fixed throughgrooves 101 at the two sides, then acylindrical section 201 of thefixing rod 2 is screwed in and matched with the screw, after reaching the required length, the screwing is stopped, anut 3 is screwed into a screw, confirmnut 3's position according to bone tunnel's length, if there is theoutstanding nut 3 of longerscrew rod section 202, then can cut off it, nevertheless need to guarantee to leave the fastening and the support section of one section nut, after finding the position, carry out the inspection of fastening nature with the screw-thread fit of both sides, the mode that can increase gasket or two nuts carries out further fastening if necessary,fracture piece 5 ends are fixed through screw 1, one side is fixed throughscrew rod section 202 and the cooperation ofnut 3 in addition, confirm once more that fixed firm, accomplish the installation, patient's bone healing back needs the incision when taking out the product, peel off the tissue and expose the utility model discloses, reject the callus that surrounds on screw 1, unscrew screw 1 andnut 3, can take out easily the utility model discloses.

Claims (6)

1. A double-thread type rear-crossing ligament fixer is characterized in that: the novel screw rod fixing device is characterized by comprising a screw (1), a fixing rod (2) and a nut (3), wherein the fixing rod (2) comprises a cylindrical section (201) and a screw rod section (202), the screw rod section (202) is connected below the cylindrical section (201), the nut (3) is connected to the screw rod section (202), an internal thread is arranged in the cylindrical section (201), and the screw (1) is connected to the internal thread of the cylindrical section (201).

2. A double-threaded rear crossover ligament fastener according to claim 1, wherein: the screw (1) is a countersunk head screw, the upper end face of the head of the screw (1) is a plane, and two grooves (101) are symmetrically arranged on the outer edge of the plane.

3. A double-threaded rear crossover ligament fastener according to claim 2, wherein: the screw is characterized in that a guide section (102) is arranged at the bottom of the screw (1), the guide section (102) is in an inverted cone shape, and the top of the cone shape is an arc surface.

4. A double-threaded rear crossover ligament fastener according to claim 1, wherein: the joint of the cylindrical section (201) and the screw section (202) is smoothly transited through an arc.

5. A double-threaded rear crossover ligament fastener according to claim 1, wherein: the screw (1) and the fixing rod (2) are made of titanium alloy or pure titanium materials.

6. A double-threaded rear crossover ligament fastener according to claim 1, wherein: the nut (3) is made of titanium alloy or medical stainless steel materials.

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