CN211156046U - Opening device for vertebral pedicle screw path - Google Patents

Abstract

The utility model relates to a ware of opening a way that vertebra pedicle of vertebral arch screw nail said, the electric iron comprises a rod body, the tail end of the body of rod is equipped with the handle, the anterior segment of the body of rod is equipped with the reducing section that diminishes to preceding diameter gradually after following, the front end integrated into one piece of reducing section has a surperficial smooth sphere, and this sphere is used for opening a way, the diameter of sphere is 1.2~1.5mm, the diameter of sphere is greater than the diameter of the front end of reducing section, and the axle section between tail end to the handle from the reducing section is the straight pole section of cylinder.

Description

Opening device for vertebral pedicle screw path

Technical Field

The utility model relates to the field of medical equipment, in particular to way ware of opening a way of vertebra pedicle of vertebral arch screw nail way.

Background

When the pedicle screw fixation fusion operation is performed through the posterior approach of the spine, vertebral pedicle screws are used, and an appropriate vertebral pedicle screw path needs to be prepared before the vertebral pedicle screws are installed, so that finding the access passages of the vertebral pedicle screws is very important for the operation. At present, each manufacturer for producing vertebral pedicle screws is provided with two types of standard openers, one type of opener is a quadrangular prism with the front end gradually enlarged from the tip end to the back end, the middle section of the opener is a cylindrical rod, the back end of the opener is a handle, the other type of opener is a straight blunt structure with the front end, is like the end structure of a straight screwdriver, the middle section of the opener is a cylindrical rod and the back end of the opener is a handle, the front ends of the two types of openers are both provided with edges and corners and are not smooth, so that the function of automatically searching vertebral pedicle medullary cavities is not provided, the screws can enter the vertebral pedicle screw channel by using large strength when preparing the vertebral pedicle screw channel, and the front ends with the edges and the corners are easy to puncture the cortex of the vertebral pedicle walls, so that nerve and blood vessel damage is.

Disclosure of Invention

The utility model aims at providing a ware of opening a way in vertebra pedicle of vertebral arch screw nail way to prior art not enough, it has the function of automatic seeking pedicle of vertebral arch pulp chamber, prevents to puncture the cortex of bone cortex of the four walls of pedicle of vertebral arch.

The technical scheme of the utility model is that: the utility model provides a ware of opening a way of vertebra pedicle of vertebral arch screw nail way, includes the body of rod, the tail end of the body of rod is equipped with the handle, the anterior segment of the body of rod is equipped with the reducing section that diminishes from backward preceding diameter gradually, the front end integrated into one piece of reducing section has a smooth surface's spheroid, and this spheroid is used for opening a way, the diameter of spheroid is 1.2~1.5mm, the diameter of spheroid is greater than the diameter of the front end of reducing section, and the axle section between tail end to the handle from the reducing section is cylindrical straight rod section.

The length L1 of this reducing section is 30~50mm, the diameter of reducing section from the 0.6~1mm 4mm that increases gradually of front end.

The length L2 of cylinder straight rod section is 90~110mm, and the diameter is 4 mm.

The handle is cylindric, and length is 100~200mm, diameter are 15~20mm, and the surface of handle is equipped with anti-skidding annular knurl.

The handle is of an integrated structure with the rod body.

The handle is fixedly connected with the rod body.

Adopt above-mentioned technical scheme: the tail end of the rod body is provided with a handle. The front section of the rod body is provided with a reducing section with the diameter gradually reduced from back to front, the front end of the reducing section is integrally formed with a sphere with a smooth surface, the sphere is used for opening a way, the sphere is aligned to a preset opening on a articular process of a vertebral body in an operation, a handle of the rod body is held by two hands, the sphere is slightly forced to penetrate into a vertebral pedicle from the opening without edges and corners, the vertebral pedicle of the sphere is penetrated into a medullary cavity of the vertebral pedicle, because the surface of the sphere for opening the way is smooth and without edges and corners, if the sphere touches hard cortical bones around the medullary cavity, the sphere without edges and corners can not penetrate into the cortical bones and can slide away from the cortical bones due to the smoothness of the outer surface, then the route searching is continued in the vertebral body until a soft medullary cavity of the vertebral pedicle is found, and therefore, the sphere plays a role of cruising in the process, the operator can accurately find the pedicle medullary cavity with only small force. The reducing section is along with the spheroid gets into behind the centrum, because the diameter of reducing section crescent from the front end to the rear end, consequently the reducing section can block in the outstanding access point department of pedicle of vertebral arch joint along with the degree of depth that gets into the centrum, prevents that the body of rod from piercing the centrum and resulting in impaling the cortex bone deeply. The diameter of the sphere is 1.2-1.5 mm, if the diameter of the sphere is too large, the process of searching for a vertebral pedicle medullary cavity is not flexible enough, the sphere is easy to deviate from a preset angle, and the vertebral pedicle is pierced to cause nerve injury, if the diameter of the sphere is too small, the sphere becomes sharp, the cortical bone is pierced easily to cause nerve and blood vessel injury, and therefore the diameter of the sphere is set to be 1.2-1.5 mm, flexibility is met, and the cortical bone cannot be pierced. The diameter of spheroid is greater than the diameter of the front end of reducing section, makes the reducing section less with the contact surface of spheroid, guarantees that the spheroid has abundant surface of patrolling and voyage to and the flexibility ratio when guaranteeing that the spheroid patrols and voyages. The shaft section between the tail end of the diameter-changing section and the handle is a cylindrical straight rod section, so that the strength of the cylindrical straight rod section is ensured.

The length L1 of this reducing section is 30~50mm, the diameter of reducing section from the 4mm of 0.6~1mm crescent of front end, the length that will reduce the section sets up the length that is fit for the centrum, satisfy vertebra pedicle of vertebral arch screw nail way required length, and the diameter of reducing section front end is less than the spheroid, can guarantee the face of cruising of spheroid, along with the degree of depth that the reducing section got into the centrum, the diameter of reducing section rear end continues to get into the centrum to the reducing section and forms the resistance, prevent to get into too deeply.

The length L2 of cylinder straight-bar section is 90~110mm, and the diameter is 4mm, and the diameter that sets up cylinder straight-bar section is the same with the diameter of reducing section rear end, makes reducing section smooth transition to cylinder straight-bar section, guarantees the intensity of the body of rod.

The handle is cylindric, and length is 100~200mm, the diameter is 15~20mm, and the surface of handle is equipped with anti-skidding annular knurl, and the in-process of handle application of force is held to both hands, and anti-skidding annular knurl can increase the frictional force between hand and the handle, plays the antiskid effect, guarantees going on smoothly of operation.

The invention is further described with reference to the drawings and the specific embodiments.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the attached drawing, 1 is a handle, 2 is a reducing section, 3 is a sphere, and 4 is a cylindrical straight rod section.

Detailed Description

Referring to fig. 1, an embodiment of a path opening device for pedicle screw track of vertebral arch is provided, which comprises a rod body, a handle 1 is arranged at the tail end of the rod body, the handle 1 and the rod body can be of an integrally formed structure and can also be fixedly connected with the rod body by welding, the handle 1 is cylindrical, the length of the handle is 100-200 mm, the diameter of the handle is 15-20 mm, the surface of the handle 1 is provided with an anti-slip knurling, the length of the handle 1 is suitable for the width of a palm, the diameter of the handle is also suitable for being tightly held on the handle 1 by a palm, the operation of a surgeon is facilitated, meanwhile, the anti-slip knurling on the handle 1 can increase the friction force between the hand and the handle 1 to play an anti-slip role, the hand is prevented from slipping from the handle 1 during an operation, the smooth progression of the operation is ensured, a diameter-changing section 2 which is gradually reduced from the back to front diameter is arranged on the front end of the rod, the front end of the tapering section 2 is integrally formed with a smooth surface of a smooth sphere 3, the diameter of the sphere is not only the sphere 2, the diameter of the sphere 2, the sphere is suitable for the diameter of the pedicle, the smooth pedicle, the diameter of the pedicle, the diameter of the pedicle is not only the sphere 2, the smooth pedicle, the pedicle is required diameter of the pedicle, the sphere, the smooth pedicle, the diameter of the smooth pedicle is required diameter of the pedicle, the sphere, the smooth pedicle is ensured, the pedicle, the smooth pedicle, the pedicle is ensured, the vertebral arch 2, the vertebral arch is ensured, the vertebral arch is not only is ensured, the vertebral arch is not only the vertebral arch 2, the vertebral arch is not only is required diameter of the vertebral arch, the vertebral arch 2, the vertebral arch is ensured, the vertebral arch is not only is required diameter of the vertebral arch 2, the vertebral arch 2, the vertebral arch is ensured, the vertebral arch 2, the vertebral arch is ensured, the vertebral arch 2, the vertebral arch 2, the vertebral arch is ensured, the.

When the opener is used, the opener is aimed at the opening of a vertebral pedicle screw which is drilled on the articular process of a vertebral body, an operator tightly holds the handle 1 of the opener with two hands and slightly forcibly pierces the sphere 3 into the vertebral body from the opening according to a preset angle, because the diameter of the sphere 3 is larger than that of the front end of the diameter-variable section 2, and the contact area between the diameter-variable section 2 and the sphere 3 is small, most of the outer surface of the sphere 3 can be used for searching the medullary cavity in the process of searching the medullary cavity of the vertebral pedicle, the flexibility is high, the searching range is wide, even if the sphere 3 touches cortical bones around the medullary cavity of the vertebral pedicle, because the sphere 3 has no edge angle, the sphere cannot puncture the cortical bones to cause nerve and blood vessel injuries, and the smooth outer surface of the sphere 3 slides away from the cortical bones to continue searching until the soft medullary cavity of the vertebral pedicle is searched, and the vertebral pedicle screw channel in the medullary cavity of the vertebral pedicle is provided, in the process, the sphere 3 has the function of automatically searching the pedicle medullary cavity, and a surgeon only needs small force. And because the opening on the articular process is 2~3mm generally, consequently along with reducing section 2 along with the spheroid 3 is constantly deepened into the centrum, 4mm diameter at the rear end of reducing section 2 can block completely in the opening of articular process, can not pierce through too deeply and lead to impaling the cortex bone.

Claims (6)

1. The utility model provides a ware of opening a way of vertebra pedicle of vertebral arch screw nail way, includes the body of rod, the tail end of the body of rod is equipped with handle (1), its characterized in that: the anterior segment of the body of rod is equipped with and follows the reducing section (2) that the preceding diameter gradually diminishes backward, the front end integrated into one piece of reducing section (2) has a smooth spheroid (3) in surface, and this spheroid (3) are used for opening a way, the diameter of spheroid (3) is 1.2~1.5mm, the diameter of spheroid (3) is greater than the diameter of the front end of reducing section (2), and the axle section between tail end to handle (1) from reducing section (2) is cylinder straight rod section (4).

2. The device for opening the vertebral pedicle screw path according to claim 1, wherein the length L1 of the reducing section (2) is 30-50 mm, and the diameter of the reducing section (2) is gradually increased from 0.6-1 mm of the front end to 4 mm.

3. The device for opening the vertebral pedicle screw path according to claim 1, wherein the length L2 of the cylindrical straight rod section (4) is 90-110 mm, and the diameter is 4 mm.

4. The device for opening the vertebral pedicle screw path according to claim 1, wherein: the handle (1) is cylindrical, the length of the handle is 100-200 mm, the diameter of the handle is 15-20 mm, and anti-skidding knurls are arranged on the surface of the handle (1).

5. The device for opening the vertebral pedicle screw path according to claim 1, wherein: the handle (1) is of an integrated structure with the rod body.

6. The device for opening the vertebral pedicle screw path according to claim 1, wherein: the handle (1) is fixedly connected with the rod body.

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