CN114343792A - Posterior longitudinal ligament fiber ring mouth gag of spinal column - Google Patents
Posterior longitudinal ligament fiber ring mouth gag of spinal column Download PDFInfo
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- CN114343792A CN114343792A CN202210055175.7A CN202210055175A CN114343792A CN 114343792 A CN114343792 A CN 114343792A CN 202210055175 A CN202210055175 A CN 202210055175A CN 114343792 A CN114343792 A CN 114343792A
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- protective shell
- outer sleeve
- cutting
- return spring
- blunt
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Abstract
A posterior longitudinal ligament fiber ring mouth gag of spinal column comprises an outer sleeve and an inner sleeve; the end part of the outer sleeve is provided with a square blunt protective shell connected with the outer sleeve; the blunt protective shell is provided with an opening; one end of the inner sleeve is provided with a cutting body, and the other end of the inner sleeve penetrates through the outer sleeve and is connected with a return spring; the cutting body is matched with the blunt protective shell in shape, the axial length of the cutting body is smaller than that of the blunt protective shell, and the cutting body is sleeved in the blunt protective shell; the opening end of the cutting body is provided with a cutting edge with an inclined opening; the other end of the return spring is connected with the outer sleeve; the square blunt protective shell is adapted to the intervertebral space and can isolate the surrounding tissues and prop against the posterior ligament; the cutting edge is normally hidden in a blunt protective shell; once the cutting edge is driven by the inner sleeve to extend out of the blunt protective shell, the posterior longitudinal ligament and the fibrous ring can be cut in sequence, and a square cut is left; after cutting is finished, the return spring drives the cutting body to return to the normal state through the inner sleeve; the invention has simple structure and safe use, and effectively avoids the risk of posterior ligament and fiber ring opening.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a posterior longitudinal ligament fiber ring mouth gag for a spinal column.
Background
The lumbar fusion operation is suitable for severe lumbar tubular bone stenosis, unstable lumbar and lumbar spondylolisthesis; the opening of the posterior longitudinal ligament and the annulus fibrosus is a necessary step for the lumbar fusion operation; the posterior longitudinal ligament is located at the back of the vertebral body in the vertebral canal, is a long ligament of the vertebral column, starts from the axis and is continuous with the covering film covering the axis vertebral body, and reaches the sacrum. Is tightly connected with the fibrous ring of the intervertebral disc and the upper and lower edges of the vertebral body, is combined with the vertebral body more loosely and has the function of limiting the excessive anteflexion of the vertebral column. The length of the anterior longitudinal ligament is equivalent to that of the anterior longitudinal ligament, the portion attached to the vertebral body is narrower, but the portion is wider at the intervertebral disc, and the posterior longitudinal ligament can limit excessive forward flexion of the vertebral column and prevent the intervertebral disc from being withdrawn backwards. The fibrous rings are located on the peripheral part of the intervertebral disc and are composed of fibrocartilage, the fibers of the fibrous rings obliquely run between vertebral bodies and are arranged in a concentric ring shape on the transverse section, and the fibers of adjacent rings have opposite slopes and are mutually crossed. There are many nerve roots, dura mater and vascular plexuses around the posterior longitudinal ligament and annulus fibrosus; the opening of the existing posterior longitudinal ligament and the fibrous ring needs to pull open the dura mater by a nerve retractor, then use a cotton piece to open the nerve root, and finally use a sharp blade to cut the posterior longitudinal ligament and the fibrous ring; the opening mode is easy to damage the dura mater spinalis and nerve roots; damage to the dura mater and nerve roots can easily cause sensory or motor dysfunction in patients; therefore, the opening mode of the posterior longitudinal ligament and the fibrous ring in the prior art has potential safety hazard.
Disclosure of Invention
The invention aims to solve the problems and provides a posterior longitudinal ligament fiber ring mouth gag for a spinal column.
The technical scheme of the invention is as follows: a posterior longitudinal ligament fiber ring mouth gag of spinal column comprises an outer sleeve and an inner sleeve which are mutually sleeved; the end part of the outer sleeve is provided with a blunt protective shell; the blunt protective shell is square, one end is connected with the outer sleeve, and the other end is open; one end of the inner sleeve is provided with a cutting body, and the other end of the inner sleeve penetrates through the outer sleeve and is connected with a return spring; the cutting body is matched with the blunt protective shell in shape, the axial length of the cutting body is smaller than that of the blunt protective shell, and the cutting body is sleeved in the blunt protective shell; the opening end of the cutting body is provided with a cutting edge with an inclined opening; the other end of the return spring is connected with the outer sleeve.
Preferably, the middle part of the outer sleeve is provided with a side handle of an oblique return spring.
Preferably, the open end of the blunt protective shell is provided with a face radius.
Preferably, one end of the inner sleeve penetrating through the outer sleeve is detachably connected with a cutting button; the cutting button is connected with a return spring.
Preferably, the cutting button is threadedly connected to the end of the inner sleeve.
Preferably, the middle part of the inner sleeve is fixedly connected with a slip ring; the end part of the outer sleeve connected with the return spring is provided with a baffle ring; the outer wall of the slip ring is in sliding fit with the inner wall of the outer sleeve, the end part of the slip ring corresponds to the baffle ring, and the setting position of the slip ring is matched with the return spring.
The invention has the beneficial effects that: the invention relates to a posterior longitudinal ligament fiber ring mouth gag of a spinal column, which comprises an outer sleeve and an inner sleeve; the end part of the outer sleeve is provided with a square blunt protective shell connected with the outer sleeve; the blunt protective shell is provided with an opening; one end of the inner sleeve is provided with a cutting body, and the other end of the inner sleeve penetrates through the outer sleeve and is connected with a return spring; the cutting body is matched with the blunt protective shell in shape, the axial length of the cutting body is smaller than that of the blunt protective shell, and the cutting body is sleeved in the blunt protective shell; the opening end of the cutting body is provided with a cutting edge with an inclined opening; the other end of the return spring is connected with the outer sleeve; the square blunt protective shell is adapted to the intervertebral space and can isolate the surrounding tissues and prop against the posterior ligament; the cutting edge is normally hidden in a blunt protective shell; once the cutting edge is driven by the inner sleeve to extend out of the blunt protective shell, the posterior longitudinal ligament and the fibrous ring are cut in sequence, and a square cut is left; after cutting is finished, the return spring drives the cutting body to return to the normal state through the inner sleeve; the invention has simple structure and safe use, and effectively avoids the risk of posterior ligament and fiber ring opening.
Drawings
FIG. 1 is a perspective view of a posterior longitudinal ligament of spinal ligament fiber ring opener with a built-in cutting edge;
FIG. 2 is an axial cross-sectional view of FIG. 1;
FIG. 3 is a sectional perspective view of the posterior longitudinal ligament of the spine with a cutting edge built in;
FIG. 4 is a perspective view of the posterior longitudinal ligament of the spine fibrous ring opener of the present invention with the cutting edge thereof being extended; (ii) a
FIG. 5 is an axial cross-sectional view of FIG. 4;
in the figure: 1. the cutting tool comprises an outer sleeve, 11 parts of a blunt protective shell, 111 parts of a face fillet, 12 parts of a stop ring, 2 parts of an inner sleeve, 21 parts of a cutting body, 211 parts of a cutting edge, 22 parts of a cutting button, 23 parts of a sliding ring, 3 parts of a return spring and 4 parts of a side handle.
Detailed Description
Example (b): referring to fig. 1-5, a posterior longitudinal ligament fiber ring mouth gag of spinal column comprises an outer sleeve and an inner sleeve which are mutually sleeved; the end part of the outer sleeve is provided with a blunt protective shell; the blunt protective shell is square and is matched with the shape of the intervertebral space; one end of the blunt protective shell is connected with the outer sleeve, and the other end is opened; the blunt protective shell is driven into the intervertebral space by the outer sleeve, the dura mater and the nerve root can be isolated outside by the blunt protective shell, and the opening end is passivated, so that the dura mater and the nerve root of a patient cannot be injured; one end of the inner sleeve is provided with a cutting body, and the other end of the inner sleeve penetrates through the outer sleeve and is connected with a return spring; the cutting body is matched with the blunt protective shell in shape, so that the cutting body and the blunt protective shell are both square; referring to fig. 3, the cutter is limited by the blunt protective shell, and can only move axially along the outer sleeve and can not rotate axially; the axial length of the cutting body is smaller than that of the blunt protective shell, and the cutting body is sleeved in the blunt protective shell; the opening end of the cutting body is provided with a cutting edge with an inclined opening; the other end of the return spring is connected with the outer sleeve; because of the existence of the return spring, the cutting edge is hidden in the passivation protective shell and is separated from the dura mater and the nerve root under the condition of no external influence; such a cutter is impossible to cut peripheral tissues including dura mater, nerve roots; however, once the inner sleeve is subjected to external force, such as that an operator presses the end where the return spring of the inner sleeve is located, the elastic force of the return spring is overcome, the inner sleeve drives the cutting edge to extend out of the passivation protective shell, and the cutting edge cuts the posterior ligament and the fibrous ring; the interior sleeve pipe receives external force and disappears, and the answer spring can in turn drive the cutting edge through interior sleeve pipe and return the journey, continues to be hidden in the passivation protective housing.
The middle part of the outer sleeve is provided with a lateral handle of an oblique return spring, so that the operation convenience is improved; the lateral handle can be used as an operation end for separating the dura mater from the nerve root on one hand, and can be used for stabilizing the action of the cutting body when the cutting body cuts the posterior longitudinal ligament and the fibrous ring on the other hand.
The open end of blunt protective housing is equipped with the face fillet, avoids the open end of blunt protective housing to hurt dura mater and nerve root when separating dura mater and nerve root.
One end of the inner sleeve penetrating out of the outer sleeve is detachably connected with a cutting button; the cutting button is connected with the return spring; the return spring is separated from the hand by the cutting button, so that the operation is more convenient and safer.
The cutting button is in threaded connection with the end part of the inner sleeve to form detachable installation, and the detachable disinfection and cleaning are convenient.
A slip ring is fixedly connected to the middle part of the inner sleeve; the end part of the outer sleeve connected with the return spring is provided with a baffle ring; the outer wall of the sliding ring is in sliding fit with the inner wall of the outer sleeve, the end part of the sliding ring corresponds to the baffle ring, on one hand, the sliding ring forms a sliding pair with the inner wall of the outer sleeve through the outer wall to increase the stability of the cutting edge when the cutting edge extends out of the passivation protective shell, on the other hand, the baffle ring performs return limiting, and the impact on the passivation protective shell when the cutting edge is hidden is reduced as much as possible; the slip ring is arranged at a position matched with the return spring; the matching relation between the arrangement position of the sliding ring and the return spring is that when the sliding ring is contacted with the retaining ring, the return spring is compressed with a certain pretightening force; when the slip ring slides to some extent within the outer sleeve, the return spring should compress to some extent.
The working process of the invention is as follows: pulling the dura mater spinalis with a nerve hook, and blocking the nerve root with a cotton piece; referring to fig. 2, the side handle is operated to make the passivation protective shell with the cutting edge inside enter the human body; the passivation protective shell isolates the dura mater spinalis and the nerve roots and abuts against the posterior longitudinal ligament; referring to fig. 4, the lateral handle is stabilized so that the outer sleeve and the passivation protective shell do not move; pressing the cutting button, and driving the cutting edge to extend out of the passivation protective shell through the inner sleeve; the sliding ring slides in the outer sleeve to maintain the stability of the cutting edge; when the cutting edge extends out of the passivation protective shell, the posterior longitudinal ligament and the fibrous ring are cut in sequence, and a square opening is cut; after cutting, the cutting button is loosened, and the return spring drives the cutting edge to retract through the inner sleeve and is concealed in the passivation protective shell again; thus, upon expulsion of the passivating protective shell, the cutter does not damage surrounding tissue, including the dura mater and nerve roots.
Claims (6)
1. A posterior longitudinal ligament fiber ring mouth gag of spinal column comprises an outer sleeve and an inner sleeve which are mutually sleeved; it is characterized in that the end part of the outer sleeve is provided with a blunt protective shell; the blunt protective shell is square, one end is connected with the outer sleeve, and the other end is open; one end of the inner sleeve is provided with a cutting body, and the other end of the inner sleeve penetrates through the outer sleeve and is connected with a return spring; the cutting body is matched with the blunt protective shell in shape, the axial length of the cutting body is smaller than that of the blunt protective shell, and the cutting body is sleeved in the blunt protective shell; the opening end of the cutting body is provided with a cutting edge with an inclined opening; the other end of the return spring is connected with the outer sleeve.
2. The posterior longitudinal ligament annulus fibrosus mouth gag of claim 1, wherein: the middle part of the outer sleeve is provided with a lateral handle of an oblique return spring.
3. The posterior longitudinal ligament annulus fibrosus mouth gag of claim 1, wherein: the opening end of the blunt protective shell is provided with a face fillet.
4. The posterior longitudinal ligament annulus fibrosus mouth gag of claim 1, wherein: one end of the inner sleeve penetrating out of the outer sleeve is detachably connected with a cutting button; the cutting button is connected with a return spring.
5. The posterior longitudinal ligament annulus fibrosus mouth gag of claim 4, wherein: the cutting button is in threaded connection with the end part of the inner sleeve.
6. The posterior longitudinal ligament annulus fibrosus mouth gag of claim 1, wherein: a slip ring is fixedly connected to the middle part of the inner sleeve; the end part of the outer sleeve connected with the return spring is provided with a baffle ring; the outer wall of the slip ring is in sliding fit with the inner wall of the outer sleeve, the end part of the slip ring corresponds to the baffle ring, and the setting position of the slip ring is matched with the return spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210055175.7A CN114343792A (en) | 2022-01-18 | 2022-01-18 | Posterior longitudinal ligament fiber ring mouth gag of spinal column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210055175.7A CN114343792A (en) | 2022-01-18 | 2022-01-18 | Posterior longitudinal ligament fiber ring mouth gag of spinal column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114343792A true CN114343792A (en) | 2022-04-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210055175.7A Pending CN114343792A (en) | 2022-01-18 | 2022-01-18 | Posterior longitudinal ligament fiber ring mouth gag of spinal column |
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| CN (1) | CN114343792A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848601A (en) * | 1972-06-14 | 1974-11-19 | G Ma | Method for interbody fusion of the spine |
| US20020068941A1 (en) * | 2000-07-06 | 2002-06-06 | Hanson David A. | Bone preparation instruments and methods |
| CN203885575U (en) * | 2014-05-27 | 2014-10-22 | 王克平 | Posterior-approach lumbar intervertebral disc cutter |
| CN106562813A (en) * | 2016-10-28 | 2017-04-19 | 邹德威 | Intervertebral disc tissue one-time overall cutting and intervertebral space forming cutter |
| CN112656458A (en) * | 2020-11-27 | 2021-04-16 | 中国人民解放军空军军医大学 | Fusion system device under spinal endoscope |
| CN113081181A (en) * | 2021-05-10 | 2021-07-09 | 北京大学第三医院（北京大学第三临床医学院） | Intervertebral disc cutter |
| CN214073492U (en) * | 2020-06-15 | 2021-08-31 | 秦丰伟 | Scalpel for cutting nucleus pulposus of intervertebral disc |
| CN215349260U (en) * | 2021-06-29 | 2021-12-31 | 大理白族自治州人民医院 | Lumbar disc herniation auxiliary cutting device capable of preventing nerve injury |
-
2022
- 2022-01-18 CN CN202210055175.7A patent/CN114343792A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848601A (en) * | 1972-06-14 | 1974-11-19 | G Ma | Method for interbody fusion of the spine |
| US20020068941A1 (en) * | 2000-07-06 | 2002-06-06 | Hanson David A. | Bone preparation instruments and methods |
| CN203885575U (en) * | 2014-05-27 | 2014-10-22 | 王克平 | Posterior-approach lumbar intervertebral disc cutter |
| CN106562813A (en) * | 2016-10-28 | 2017-04-19 | 邹德威 | Intervertebral disc tissue one-time overall cutting and intervertebral space forming cutter |
| CN214073492U (en) * | 2020-06-15 | 2021-08-31 | 秦丰伟 | Scalpel for cutting nucleus pulposus of intervertebral disc |
| CN112656458A (en) * | 2020-11-27 | 2021-04-16 | 中国人民解放军空军军医大学 | Fusion system device under spinal endoscope |
| CN113081181A (en) * | 2021-05-10 | 2021-07-09 | 北京大学第三医院（北京大学第三临床医学院） | Intervertebral disc cutter |
| CN215349260U (en) * | 2021-06-29 | 2021-12-31 | 大理白族自治州人民医院 | Lumbar disc herniation auxiliary cutting device capable of preventing nerve injury |
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