Cervical vertebra posterior longitudinal ligament lifting cutter

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a cervical vertebra posterior longitudinal ligament lifting cutter which comprises a grip, a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are both detachably connected with the grip, the first connecting rod is fixedly connected with a positioning rod, and the second connecting rod is fixedly connected with a lifting cutter. The lifting cutter and the second connecting rod are in an L shape, the lifting cutter is divided into a cutter part and a guide part, the cutting edge direction of the lifting cutter part is parallel to the grip and faces upwards, the cutter back of the lifting cutter part is in a circular arc shape, and the guide part of the lifting cutter is in a spherical shape; the problem that the spinal cord of a patient is easily injured due to the fact that the posterior longitudinal ligament is generally cut by combining a blunt separator and a sharp blade in a posterior longitudinal ligament cutting operation in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a cervical posterior longitudinal ligament lifting and cutting knife. Background Technology

[0002] The posterior longitudinal ligament is a long ligament of the spine, originating from the axis and continuing through the lamina truncatum covering the axis vertebral body, extending down to the sacrum. It is tightly connected to the annulus fibrosus of the intervertebral disc and the upper and lower margins of the vertebral body, but its connection to the vertebral body is relatively loose. It helps limit excessive forward flexion of the spine. Its length is comparable to that of the anterior longitudinal ligament. The portion that adheres to the vertebral body is relatively narrow, but it widens at the intervertebral disc. The posterior longitudinal ligament helps limit excessive forward flexion of the spine and prevents posterior disc herniation.

[0003] Anterior cervical spine surgery is the standard procedure for treating cervical spondylosis. During the surgery, it is often necessary to cut the posterior longitudinal ligament to fully decompress the spinal cord. When cutting the posterior longitudinal ligament with existing instruments, it is necessary to first use a blunt dissector to locate the posterior longitudinal ligament and separate it from the spinal cord, and then use a sharp blade to cut the posterior longitudinal ligament. This method is relatively complicated and has low safety, and is prone to causing damage to the patient's spinal cord, making it unsuitable for use. Utility Model Content

[0004] The present invention aims to provide a posterior longitudinal ligament ligament cutting knife to solve the problem that the existing technology for posterior longitudinal ligament cutting surgery usually uses a combination of a blunt separator and a sharp blade to cut the posterior longitudinal ligament, which is prone to causing damage to the patient's spinal cord.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The basic technical solution provided by this utility model is: a cervical posterior longitudinal ligament lifting and cutting knife, including a handle, a first connecting rod and a second connecting rod. The first connecting rod and the second connecting rod are detachably connected to the handle. A positioning rod is fixedly connected to the first connecting rod, and a lifting and cutting knife is fixedly connected to the second connecting rod. The lifting and cutting knife and the second connecting rod are in an "L" shape. The lifting and cutting knife is divided into a cutting part and a guiding part. The blade direction of the cutting part of the lifting and cutting knife is parallel to the handle and facing upward. The back of the cutting part of the lifting and cutting knife is arc-shaped, and the guiding part of the lifting and cutting knife is spherical.

[0007] The principle of the basic technical solution: The positioning rod is used to detect and locate the position of the posterior longitudinal ligament. After positioning, it is taken out. The guide part of the lifting cutter and the back of the cutting part of the lifting cutter are used as guides to insert the lifting cutter into the corresponding position. The posterior longitudinal ligament can be cut by lifting the lifting cutter.

[0008] The beneficial effects of the basic technical solution are as follows: the positioning rod is cylindrical, and the position of the posterior longitudinal ligament is determined by pushing and pulling the positioning rod with the handle, which avoids the risk of injury to the patient caused by directly using the lifting knife and ensures the effectiveness of the operation. At the same time, the back of the cutting part of the lifting knife is arc-shaped, and the guide part of the lifting knife is spherical. Therefore, the risk of blade damage to the spinal cord is greatly reduced when pushing the lifting knife to probe the posterior longitudinal ligament.

[0009] Preferably, both the first connecting rod and the second connecting rod are detachably connected to the grip via threads.

[0010] With the above settings, the first or second connecting rod is controlled to rotate relative to the handle, thereby removing the first or second connecting rod from the handle, making it easier for medical personnel to clean and disinfect the positioning rod and the lifting cutter.

[0011] Preferably, the grip surface is provided with several sets of anti-slip protrusions.

[0012] The above-mentioned design, with its anti-slip protrusions, increases the friction of the grip, making it easier for medical staff to hold the device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a posterior longitudinal ligament lifting and cutting knife of the present invention;

[0014] 1. Handle; 2. First connecting rod; 3. Positioning rod; 4. Second connecting rod; 5. Lifting cutter; 6. Anti-slip protrusion. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0016] like Figure 1 As shown, a cervical posterior longitudinal ligament lifting cutter includes a handle 1, a first connecting rod 2, and a second connecting rod 4. Both the first connecting rod 2 and the second connecting rod 4 are detachably connected to the handle 1 via threads. The surface of the handle 1 is provided with several sets of anti-slip protrusions 6. The first connecting rod 2 is fixedly connected to a positioning rod 3, and the second connecting rod 4 is fixedly connected to a lifting cutter 5. The lifting cutter 5 and the second connecting rod 4 are in an "L" shape. The lifting cutter 5 is divided into a cutting part and a guide part. The blade direction of the cutting part of the lifting cutter 5 is parallel to the handle 1 and faces upward. The back of the blade of the cutting part of the lifting cutter 5 is arc-shaped, and the guide part of the lifting cutter 5 is spherical.

[0017] The specific implementation process is as follows:

[0018] When using this new device, medical staff hold the handle 1 and use the positioning rod 3 to probe the posterior longitudinal ligament. After the posterior longitudinal ligament is detected, the corresponding position is memorized and the positioning rod 3 is removed. Then, the lifting cutter 5 is inserted into the previously detected posterior longitudinal ligament. By lifting the lifting cutter 5, the posterior longitudinal ligament is cut. The back of the lifting cutter 5 is arc-shaped, and the guide part at its front end is spherical, which reduces the risk of damaging the patient's spinal cord and is convenient to use.

[0019] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A cervical posterior longitudinal ligament lifting and cutting knife, characterized in that: Includes a handle (1), a first connecting rod (2), and a second connecting rod (4). The first connecting rod (2) and the second connecting rod (4) are detachably connected to the handle (1). The first connecting rod (2) is fixedly connected to a positioning rod (3), and the second connecting rod (4) is fixedly connected to a lifting cutter (5). The lifting cutter (5) and the second connecting rod (4) are in an "L" shape. The lifting cutter (5) is divided into a cutting part and a guide part. The blade direction of the cutting part of the lifting cutter (5) is parallel to the handle (1) and facing upwards. The back of the blade of the cutting part of the lifting cutter (5) is arc-shaped, and the guide part of the lifting cutter (5) is spherical.

2. The cervical posterior longitudinal ligament lifting and cutting knife according to claim 1, characterized in that: Both the first connecting rod (2) and the second connecting rod (4) are detachably connected to the grip (1) by threads.

3. The cervical posterior longitudinal ligament lifting and cutting knife according to claim 1, characterized in that: The grip (1) has several sets of anti-slip protrusions (6) on its surface.

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