CN217645288U - Guide rod capable of monitoring whether trephine cuts vertebral canal - Google Patents

Abstract

The utility model relates to a section can monitor whether trepan cuts the guide arm of canalis spinalis, it includes: the guide rod head end and the cylindrical guide rod somatic part of shovel shape, the shovel shape head end characteristic be: the appearance is in a shape of a shovel, the cross section is in a shape of a straight line, and the height of the shape of the shovel is 5mm; the cylindrical body is characterized in that: is connected with the shovel-shaped head end, and the length of the body part is 250mm. The utility model has strong adaptability, and can be divided into two different specifications according to the outer diameter of the cylindrical guide rod body part and the length of the shovel-shaped head end, thereby better meeting the operation requirements of different spinal stenosis severity degrees; because the characteristic of guide bar head end shovel shape, along with the operation process, can judge whether the bone piece that the trepan cut cuts off through observing whether the guide bar can follow trepan synchronous revolution, guarantee that patient's safety and operation go on smoothly. The utility model discloses a simple structure, convenient operation, economic cost is low, easily extensive popularization and application.

Description

Guide rod capable of monitoring whether trephine cuts vertebral canal

Technical Field

The invention belongs to a surgical instrument in the field of medical instruments. In particular to a guide rod used for guiding a trepan to carry out intervertebral foramen expansion and formation in intervertebral foramen endoscopic surgery, which is characterized in that the head end of the guide rod is in a shovel shape, and the shovel-shaped head end can be inserted and fixed in a bony structure of a vertebral facet joint when in use; the guide rod body is cylindrical, and the cylindrical guide rod body rotates along with the trepan and the bone block after the bone block is cut by the trepan and loosened by the trepan. When the trephine is used for expanding and forming an intervertebral foramen in an intervertebral foramen endoscopic operation, the tail end of the guide rod can be knocked to insert the shovel-shaped head end of the guide rod into a bone of an articular process, then the trephine with the diameter larger than that of the guide rod is sleeved and guided into the guide rod along the guide rod, and the tail end of the guide rod is exposed out of the trephine. And rotating the trepan by taking the guide rod as a circle center to cut the facet joint. When the bone block is not completely cut and dissociated, the guide rod cannot rotate along with the trepan, when the cutting of the trepan deepens and the trepan serration reaches the vertebral canal, the bone block is completely cut off and loosened by the trepan but the shovel-shaped head end of the guide rod is still inserted into the bone block, the tail end of the guide rod can be observed to synchronously rotate along with the trepan, the serration of the trepan is just close to the nervous tissue at the moment, and an operator can stop the cutting operation according to the cutting operation, so that the serration of the trepan is prevented from damaging the nerve.

Background

In the process of intervertebral foramen mirror minimally invasive surgery operation of spinal surgery, when a working channel with the diameter of about 7.3mm is established, the working channel cannot be directly accommodated because the intervertebral foramen is small, bone structures such as facet joints around the intervertebral foramen need to be cut and shaped, and the step needs to use a trepan with fine teeth to cut the bone structures; the method used at present is that a guide rod with a smooth head end is placed close to the edge of a facet joint, then a trepan is sleeved and guided along the guide rod, then the trepan is rotated clockwise to cut the facet joint, the trepan is considered to cut off the bony structures completely when the cutting of the trepan is gradually deepened to the falling feeling, at the moment, the cutting needs to be stopped immediately, otherwise, the fine teeth of the trepan can enter the vertebral canal and damage the nerve root or dura mater and other important structures. However, the feeling of falling from the space is difficult to master, and inexperienced doctors often control the safety depth of the circular saw, so that nerves are easy to be damaged in the operation.

The guide rod used at present is a cylinder with a smooth head end, can only be placed tightly close to the facet joint and cannot be inserted into and firmly embedded in the bone of the facet joint, and even if a bone block is completely cut off and dissociated and the trephine drives the bone block to rotate, the guide rod with the smooth head end cannot synchronously rotate along with the bone block, so that misjudgment is easily caused, that the bone block is not completely cut off, that the serration of the trephine does not enter the vertebral canal, and at the moment, if the trephine is continuously screwed inwards, nerves are easily damaged. Similarly, when the trephine completely cuts off the bone block and frees the bone block, if the last thin layer of bony connection is twisted off by rotating the guide rod, because the head end of the guide rod is smooth, the guide rod only rotates when the guide rod is rotated, the bone block cannot be driven to rotate together, the thin layer of bony connection cannot be twisted off by the guide rod, the trephine can only continue to cut, and the nerve injury is easy to occur. Therefore, the improvement of the guide rod with a smooth head end is urgently needed clinically.

Disclosure of Invention

The guide rod newly designed by the invention comprises a body part and a head end of the guide rod. The guide rod body is a cylinder, the length of the guide rod body is 250mm, the diameter of the guide rod body is 5mm, and the guide rod body is connected with the end of the guide rod head. The appearance of the head end of the guide rod is in a shovel shape, the cross section is in a straight line shape, and the length of the guide rod is 5mm. There are two commonly used specifications: the outer diameter of the body part is 4.0mm, and the head end of the middle guide rod is in a straight shape with the length of 4mm and the width of 1 mm; the outer diameter of the body part is 5.0mm, and the head end of the large-size guide rod is in a straight shape, the length of the large-size guide rod is 5mm, and the width of the large-size guide rod is 1 mm. Can be respectively matched with a middle-size trepan with the outer diameter of 6.5mm and a large-size trepan with the outer diameter of 7.5mm for use.

Drawings

Figure 1 is a schematic view of a facet joint cut using a guide rod. Description of the reference numerals: 1-a cylindrical guide rod body, 2-a shovel-shaped guide rod head, 3-a serration trepan, 4-a facet joint, 5-a dura mater and nerves;

fig. 2 is an external view of the guide bar, 1-cylindrical guide bar body, 2-shovel-shaped guide bar head end.

Detailed Description

When a trephine is used for expanding and forming an intervertebral foramen in an intervertebral foramen endoscopic operation, a guide rod is inserted into a soft tissue channel, and the tail end of the guide rod is knocked to insert the shovel-shaped head end of the guide rod into a bone of an articular process. Then the soft tissue channel is withdrawn, the trepan with the diameter larger than that of the guide rod is sleeved and guided along the guide rod, and the tail end of the guide rod is exposed outside the trepan. Then, the trephine is rotated clockwise with the guide rod as the center to cut the facet joint. When the bone block is not completely cut and loosened, the guide rod inserted in the bone block cannot rotate along with the trepan; when the serration of the trepan reaches the vertebral canal, the bone block is completely cut off and loosened by the trepan, the guide rod can be observed to synchronously rotate along with the trepan, the serration of the trepan is close to the nerve tissue, and an operator can judge that the trepan is cut in place to stop the cutting operation according to the result, so that the serration of the trepan is prevented from damaging the nerve in the vertebral canal.

Claims (2)

1. The guide rod capable of monitoring whether the trephine cuts the vertebral canal is characterized in that the guide rod is not provided with a central hole and is a metal entity made of medical stainless steel; is divided into a cylindrical guide rod body part (1) and a shovel-shaped head end (2); the head end (2) of the guide rod is shaped like a shovel, the cross section of the guide rod is in a straight line shape, and the height of the shovel is 5mm; the head end is connected with a cylindrical guide rod body (1) in a backward continuous mode, and the length of the body is 250mm.

2. The guide bar of claim 1, wherein the guide bar is sized to monitor whether the trephine cuts the spinal canal, and further comprising: the outer diameter of the body part is 4.0mm, and the head end of the middle guide rod is in a straight shape with the length of 4mm and the width of 1 mm; the outer diameter of the body part is 5.0mm, and the head end of the large-size guide rod is in a straight shape, is 5mm long and 1mm wide; can be respectively matched with a medium-sized trepan with the outer diameter of 6.5mm and a large-sized trepan with the outer diameter of 7.5mm for use.

Images