CN203153924U - Posterior pelvic ring sacrum minimally invasive internal fixer - Google Patents

Abstract

The utility model provides a minimally invasive internal fixator for the posterior pelvic ring through the sacrum, which belongs to the technical field of medical devices. There are upper oblong holes and lower oblong holes at the ends respectively, and hollow screws are pierced through the upper oblong holes of the left connecting steel plate and the right connecting steel plate respectively, and the bolts are pierced and connected in the lower oblong holes of the left connecting steel plate and the right connecting steel plate at the same time. The bolt at the connecting steel plate is fixed on the left connecting steel plate through the fixing nut and the lock nut, and the bolt at the right connecting steel plate is fixed on the right connecting steel plate through the fixing nut and the locking nut. The utility model is safe and accurate, and is used in conjunction with a navigation system, which can effectively avoid damage to the sacroiliac trunk, sacral nerve, dura mater or presacral blood vessels when guide pins, bolts or screws are placed during the operation.

Description

Minimally Invasive Internal Fixator for the Posterior Pelvic Ring Transsacral

technical field

The utility model relates to the technical field of medical equipment, in particular to a minimally invasive internal fixator for the posterior pelvic ring through the sacrum.

Background technique

Generally, the sacroiliac joint is formed by the auricular surfaces of the sacrum and ilium. It is a synovial joint in structure, and can be regarded as flexor joint or pulley joint in terms of movement mode. In clinical operations, the internal fixation of the posterior pelvic ring through the sacrum is traumatic and has surgical safety risks. The internal fixation strength cannot be fully guaranteed, the load distribution of the internal fixation is uneven, and the degree of resistance to internal and external forces is relatively low. The fixation and reduction of bilateral sacral fractures and sacroiliac joint dislocations have a certain degree of risk.

Contents of the invention

The technical task of the utility model is to solve the deficiencies of the prior art, and provide a minimally invasive internal fixator for the posterior pelvic ring through the sacrum.

The technical scheme of the utility model is realized in the following manner, the posterior pelvic ring is minimally invasive internal fixator through the sacrum, its structure includes hollow screws, bolts, left connecting steel plate and right connecting steel plate, on the left connecting steel plate and right connecting steel plate, There are upper oblong holes and lower oblong holes at the lower ends respectively, and hollow screws are pierced through the upper oblong holes of the left connecting steel plate and the right connecting steel plate respectively, and the bolts are simultaneously connected in the lower oblong holes of the left connecting steel plate and the right connecting steel plate , the bolt at the left connecting steel plate is fixed on the left connecting steel plate through the fixing nut and the lock nut, and the bolt at the right connecting steel plate is fixed on the right connecting steel plate through the fixing nut and the locking nut.

The head of the hollow screw adopts a cross-shaped nail head or a hexagonal nail head.

The lock nut adopts a hexagonal lock nut.

Compared with the prior art, the utility model has the following beneficial effects:

The posterior pelvic ring transsacral minimally invasive internal fixator system has the following characteristics:

1. It is safe and accurate, and it is used in conjunction with the navigation system, which can effectively avoid the damage to the sacroiliac trunk, sacral nerve, dura mater or presacral blood vessels when placing guide pins, bolts or screws during the operation;

2. The trauma is small, and the fixation can be completed through minimally invasive small incisions on the bilateral buttocks;

3. The fixation strength is high, the sacrum, the sacroiliac joint, the pedicle of the sacrum and the vertebral body of the sacrum are directly penetrated and fixed in multiple parts of the pelvic posterior ring, the load is evenly distributed, and the anti-rotation and shear strength are high;

4. The combination is flexible and convenient. According to the anatomical variation and the fracture reduction situation, the screw or screw can be flexibly selected for fixation, and the fracture end can be pressurized or fixed according to the fracture site and fracture reduction situation;

5. Wide adaptability, suitable for various types of unilateral and bilateral sacral fractures and sacroiliac joint dislocations;

6. The physiological interference is small. When it is used to fix "H" and "U" sacral fractures, it can directly and firmly fix the posterior pelvic ring, avoid fixing the lumbar spine, and significantly reduce the physiological interference of the previous lumbosacral fixation system.

The posterior pelvic ring transsacral minimally invasive internal fixator has reasonable design, simple structure, safety and reliability, convenient use and easy maintenance, and has good popularization and use value.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model;

Accompanying drawing 2 is the structural representation of the left connecting steel plate of the present utility model;

Accompanying drawing 3 is the structural representation of the utility model in use.

The marks in the accompanying drawings indicate respectively:

1. Left connecting steel plate, 2. Right connecting steel plate, 3. Upper oblong hole, 4. Lower oblong hole, 5. Hollow screw, 6. Bolt, 7. Fixed nut, 8. Lock nut.

Detailed ways

Below in conjunction with accompanying drawing, the pelvic posterior ring transsacrum minimally invasive internal fixator of the present utility model is described in detail below.

As shown in the accompanying drawings, the posterior pelvic ring transsacral minimally invasive internal fixator of the utility model has a structure comprising hollow screws 5, bolts 6, left connecting steel plate 1 and right connecting steel plate 2, left connecting steel plate 1 and right connecting steel plate 2 The upper and lower ends are respectively provided with an upper oblong hole 3 and a lower oblong hole 4, hollow screws 5 are pierced through the upper oblong holes of the left connecting steel plate 1 and the right connecting steel plate 2 respectively, and the bolts 6 are connected through the left connecting steel plate 1 at the same time In the lower oblong hole 4 of the right connecting steel plate 2, the bolt at the left connecting steel plate 1 is fixed on the left connecting steel plate through the fixing nut 7 and the lock nut 8, and the bolt at the right connecting steel plate 2 is fixed on the left connecting steel plate through the fixing nut and the lock nut. The tightening nut fixes the bolt on the right connecting steel plate. The head of the hollow screw 5 adopts a cross-shaped nail head or a hexagonal nail head. Lock nut 8 adopts hexagonal lock nut.

The posterior pelvic ring transsacral minimally invasive internal fixator system is designed based on a large number of pelvic CT image data, a large number of human specimen measurement data, and years of experience in minimally invasive internal fixation of the posterior pelvic ring. It consists of sleeve, guide pin, depth gauge, hollow screw, hollow screwdriver, hollow drill bit, bolt, fixing nut, lock nut and connecting steel plate. The inner diameter of the sleeve is 2.5mm, which is used with the navigation handle to place the guide pin; the diameter of the guide pin is 2.5mm, and the length is 500mm, and it is used with the sounding gauge to determine the length of the screw or bolt; the inner diameter of the hollow screw is 2.5mm, the outer diameter is 6.5mm, and the length is 40mm. -80mm, divided into pressurized type and non-pressurized type, used together with the hollow screwdriver to fix the vertebral body, unilateral pedicle and ipsilateral guide wire of S1 or S2; the inner diameter of the hollow drill bit is 2.5mm, the outer diameter is 4.5mm, It is used to ream the hole along the guide wire; the diameter of the bolt is 4.5mm, and the length is 160-400mm, which is used to penetrate and fix the vertebral body, bilateral pedicle and bilateral ilium of S1 or S2; the fixing nut and lock nut are used to fix the bolt Fix to the connecting plate; the connecting plate is designed with double elliptical holes, 30-60mm long, and is used to connect and fix the screws or bolts passing through S1 or S2 closely to the outer surface of the ilium.

Claims (3)

1. The minimally invasive internal fixator for the posterior pelvic ring through the sacrum, which is characterized in that it includes hollow screws, bolts, left and right connecting plates, and the upper and lower ends of the left and right connecting plates are respectively provided with upper oblong holes and lower The oblong holes, the upper oblong holes of the left connecting steel plate and the right connecting steel plate are respectively pierced with hollow screws. The lock nut fixes the bolt on the left connecting steel plate, and the bolt at the right connecting steel plate places the bolt on the right connecting steel plate through the fixing nut and the locking nut. 2. The minimally invasive transsacral internal fixator for the posterior pelvic ring according to claim 1, characterized in that the head of the hollow screw adopts a cross-shaped nail head or a hexagonal nail head. 3. The minimally invasive internal fixator for pelvic posterior ring transsacrum according to claim 1, wherein the locking nut adopts a hexagonal locking nut.

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