Special protection sharp knife for fiber ring incision in UBE operation
By designing the thread engagement mechanism of the protective sheath and the adjusting sleeve, the problem of stabbing the surrounding tissue during the insertion process is solved, achieving a safer and more efficient fiber annular cutting operation.
Patent Information
- Application Number
- CN202422099798.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In unilateral dual-channel spinal endoscopy, the blade of the existing annular fibrous knife is prone to stab the surrounding tissue during the insertion process, and the field of operation is limited, which is at risk of stabbing the spinal cord or dural in the spinal canal.
A special protective sharp knife for UBE surgical fiber circumcision is designed. By installing a protective sheath and an adjustment sleeve on the main body of the ring blade, the thread engagement is used to collect and extend the cutting edge, ensuring that the protective sheath covers the blade during the exploration process until the target area is accurately adjusted and then extends for cutting.
It effectively avoids the risk of stabbing surrounding tissues during the exploration process, improves the safety and accuracy of the operation, and enhances the efficiency of the surgery.
Smart Images
Figure CN223158408U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a special protective sharp knife for UBE surgical annulotomy. Background Art
[0002] Unilateral dual-channel spinal endoscopy technology is an emerging minimally invasive endoscopic technique in spinal surgery. Two incisions are made, one of which is about 5mm for inserting the endoscope for observation and continuous saline flushing, and the other is about 8-10mm for operating the instrument entrance and saline outflow. By using a step-by-step expansion sleeve, two independent percutaneous channels are established. The endoscope and surgical instruments are in a triangular relationship, separated from each other, and do not interfere with each other. They can be tilted and moved at will, and the operation is convenient and flexible. Water irrigation helps to form a working space, reduce bleeding and maintain a clear surgical field of view. Ordinary surgical instruments can be used for decompression during the operation, which is highly efficient, with less bleeding and faster patient recovery. It is expected to replace traditional open surgery as a treatment for lumbar disc herniation and lumbar spinal stenosis, which can greatly reduce the pain of patients, but the following problems exist in clinical practice:
[0003] Because the instruments must be inserted through the skin and across the various layers of the spinal structure, the visual range is limited compared to traditional open surgery. Treatment of lumbar disc herniation requires a scalpel to cut through the annulus fibrosus of the intervertebral disc, and then a nucleus pulposus forceps to remove the herniated nucleus pulposus. However, the incision used by the surgical instruments is approximately 8-10mm long, and the spinal tissue layer is 8-15cm thick, making the handles of existing surgical scalpels or disposable scalpels relatively short.
[0004] 2. The fiber ring knife currently used in unilateral double-channel spinal endoscopic surgery is a one-piece metal knife about 25 cm long. This special fiber ring knife has a slender operating end and a sharp blade. However, the fiber ring knife needs to pass through 8-15 cm of soft tissue layer during the insertion process from the incision to the annulus fibrosus, and the field of view during the insertion process is limited. There is a risk of the blade injuring surrounding tissues. Once the direction deviates, there is a risk that the tip of the knife will injure the spinal cord in the spinal canal or pierce the dura mater.
[0005] Therefore, a cutting instrument is designed that can retract the blade portion for protection during the insertion process. When the instrument is inserted to the target depth, the blade is extended from the protective sheath. The instrument is specifically a special protective sharp knife for UBE surgical annulus fiber incision. Utility Model Content
[0006] In order to overcome the problems raised in the background technology, the present invention adopts the following technical solutions:
[0007] A special protective sharp knife for annulus fibrosus incision in UBE surgery, which comprises: a circular knife body including a holding handle and an execution part, the holding handle and the execution part being coaxially connected; a protective sheath with a protective cavity internally, an external thread being provided on the outer wall of the protective sheath, the protective sheath being sleeved outside the circular knife body; an adjusting sleeve with an adjusting cavity internally, the inner wall of the adjusting sleeve being the side wall of the adjusting cavity, an internal thread being provided on the inner wall of the adjusting sleeve, the adjusting sleeve being sleeved outside the protective sheath, the internal thread meshing with the external thread, when the adjusting sleeve rotates circumferentially, the protective sheath moves axially on the adjusting sleeve.
[0008] Further, the execution part includes a cutting edge and a connecting rod, one end of the connecting rod is connected to the cutting edge, the other end of the connecting rod is connected to the holding handle, the connection mode between the connecting rod and the holding handle is detachable connection, and the connection mode between the connecting rod and the cutting edge is also detachable connection. The service loss of the connecting rod is much lower than that of the cutting edge and the holding handle. Under the cooperation mode of detachable connection, the cutting edge or the holding handle can be replaced at any time, thereby effectively improving the service life of the circular knife body.
[0009] Further, a limiting ring is provided on the connecting rod, a limiting groove is provided in the adjusting cavity, the limiting ring is sleeved in the limiting groove, so that the adjusting sleeve can rotate coaxially with the circular knife body, but the adjusting sleeve cannot move axially along the circular knife body.
[0010] Further, the protective sheath includes a probing state and an execution state. In the probing state, the cutting edge is completely retracted into the protective sheath, and at this time, the axial distance between the protective sheath and the holding handle is the farthest; in the execution state, the protective sheath moves axially towards the holding handle, so that the cutting edge extends out of the protective sheath.
[0011] Further, a scale mark is provided on the outer wall of the protective sheath. When the protective sheath is in the initial state, one end of the adjusting sleeve is aligned with the zero scale position of the scale mark. When the protective sheath is in the execution state, the scale of the scale mark corresponds to the extending length of the cutting edge.
[0012] Further, each side edge of the cutting edge is a blade part.
[0013] Further, the axial length of the execution part is not less than 150 mm to ensure that the execution part can pass through the soft tissue layer to reach the surgical target area.
[0014] Further, the axial length of the protective sheath is not greater than 150 mm to ensure that the cutting edge can protrude from the protective sheath.
[0015] Furthermore, both ends of the adjustment cavity have openings communicating with the outside, and the maximum outer diameter of the external thread on the protective sheath is greater than the diameter of the opening, so as to ensure that the protective sheath can only achieve axial movement through the engagement of the external thread and the internal thread in the adjustment cavity and cannot escape from the adjustment cavity.
[0016] Furthermore, the number of turns of the external thread is less than the number of turns of the internal thread.
[0017] Advantages of the utility model:
[0018] 1. The adjustment sleeve is rotatably sleeved on the core cutter body and there is no axial relative displacement with the core cutter body. The protective sheath is sleeved on the core cutter body and the reciprocating stroke along the axis is restricted by the meshing length of the internal thread and the external thread. The user can rotate the adjustment sleeve to release or wrap the cutting edge with the protective sheath, so as to completely avoid the situation that the cutting edge damages the surrounding tissues of the patient during the probing process.
[0019] 2. The protective sheath is provided with scales, and the user can accurately control the length of the cutting edge extending out of the protective sheath, which has better practical effects compared with the existing fiber core cutter. Description of the drawings
[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model when the protective sheath is in the probing state;
[0021] Figure 2 It is a schematic diagram of the overall structure of the utility model when the protective sheath is in the execution state;
[0022] Figure 3 Based on Figure 1 is a schematic cross-sectional structure diagram;
[0023] Figure 4 Based on Figure 2 is a partial schematic cross-sectional structure diagram;
[0024] Figure 5 It is a schematic diagram of the overall structure of the adjustment sleeve;
[0025] Figure 6 It is a schematic diagram of the overall structure of the protective sheath;
[0026] In the figure, 1. Core cutter body; 11. Holding handle; 12. Execution part; 121. Cutting edge; 122. Connecting rod; 123. Limit ring; 2. Protective sheath; 21. Protection cavity; 22. External thread; 23. Scale mark; 3. Adjustment sleeve; 31. Adjustment cavity; 311. Limit groove; 312. Opening; 32. Internal thread. Detailed implementation manners
[0027] The technical solutions in the embodiments of the present utility model will be clearly and completely described below through specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.
[0028] A special protective sharp knife for annulus fibrosus incision in UBE surgery, as Figures 1 - 6 shown, it includes: an annular knife body 1, including a holding handle 11 and an execution part 12, the holding handle 11 and the execution part 12 are coaxially connected; a protective sheath 2 with a protective cavity 21 inside, the outer wall of the protective sheath 2 is provided with an external thread 22, and the protective sheath 2 is sleeved outside the annular knife body 1; an adjustment sleeve 3 with an adjustment cavity 31 inside, the inner wall of the adjustment sleeve 3 is provided with an internal thread 32, the adjustment sleeve 3 is sleeved outside the protective sheath 2, and the internal thread 32 meshes with the external thread 22. When the adjustment sleeve 3 rotates circumferentially, the protective sheath 2 moves axially in the adjustment sleeve 3.
[0029] In some embodiments of the present application, as Figures 1 - 6 shown, the execution part 12 includes a cutting edge 121 and a connecting rod 122. One end of the connecting rod 122 is connected to the cutting edge 121, and the other end of the connecting rod 122 is connected to the holding handle 11. The connection manner between the connecting rod 122 and the holding handle 11 is a detachable connection, and the connection manner between the connecting rod 122 and the cutting edge 121 is also a detachable connection. The usage loss of the connecting rod 122 is much lower than that of the cutting edge 121 and the holding handle 11. In the cooperation mode of the detachable connection, the cutting edge 121 or the holding handle 11 can be replaced at any time, thereby effectively improving the service life of the annular knife body 1.
[0030] In some other embodiments of the present application, the connecting rod 122 is integrally connected to the holding handle 11, and the connecting rod 122 is also integrally connected to the cutting edge 121. This connection manner is more stable and can be better applied as a disposable surgical instrument in a radioactive operation environment or during surgery on a radioactive patient.
[0031] In some embodiments of the present application, as Figures 1 - 6 shown, a limiting ring 123 is provided on the connecting rod 122, and a limiting groove 311 is provided in the adjustment cavity 31. The limiting ring 123 is sleeved in the limiting groove 311, so that the adjustment sleeve 3 can rotate coaxially with the annular knife body 1, but the adjustment sleeve 3 cannot move axially along the annular knife body 1.
[0032] In some embodiments of the present application, as Figures 1 - 6 shown, the protection sheath 2 includes a probing state and an execution state. In the probing state, the cutting edge 121 is completely retracted into the protection sheath 2, and at this time, the axial distance between the protection sheath 2 and the holding handle 11 is the farthest; in the execution state, the protection sheath 2 moves axially along the holding handle 11, so that the cutting edge 121 extends out of the protection sheath 2.
[0033] In some embodiments of the present application, as Figures 1 - 6 shown, the outer wall of the protection sheath 2 is provided with a scale mark 23. When the protection sheath 2 is in the initial state, one end of the adjusting sleeve 3 is aligned with the zero scale position of the scale mark 23. When the protection sheath 2 is in the execution state, the scale of the scale mark 23 corresponds to the extending length of the cutting edge 121.
[0034] In some embodiments of the present application, as Figures 1 - 6 shown, each side edge of the cutting edge 121 is a cutting part. The advantage of this embodiment is that the doctor does not need to adjust the cutting direction of the cutting edge 121 in advance before inserting the surgical ring knife into the target area of the patient's body. When the cutting edge 121 reaches the target area, the alignment between the cutting edge and the tissue to be cut can be achieved by rotating the holding handle 11 around the axis within the protection sheath 2, and the bilateral cutting edges can halve the rotation angle required for the holding handle 11, thereby improving the surgical efficiency to a certain extent.
[0035] In some embodiments of the present application, as Figures 1 - 6 shown, the axial length of the execution part 12 is not less than 150 mm to ensure that the execution part 12 can pass through the soft tissue layer to reach the surgical target area. The axial length of the protection sheath 2 is not greater than 150 mm to ensure that the cutting edge 121 can protrude from the protection sheath 2. The number of turns of the external thread 22 is less than the number of turns of the internal thread 32.
[0036] In some embodiments of the present application, as Figures 1 - 6 shown, both ends of the adjusting cavity 31 have openings 312 communicating with the outside. The maximum outer diameter of the external thread 22 on the protection sheath 2 is greater than the diameter of the opening 312, so as to ensure that the protection sheath 2 can only move axially within the adjusting cavity 31 through the engagement of the external thread 22 and the internal thread 32 and cannot escape from the adjusting cavity 31.
[0037] The usage method of the combined utility model:
[0038] Before use and after use, the protection sheath 2 needs to be restored to the inserted state to prevent harm to patients or medical staff. The end of the annulotomy knife and each structure constituting the annulotomy knife close to the patient is defined as the proximal end when in use, and the end opposite to the proximal end is the distal end. The user holds the holding handle 11 with one hand and inserts the proximal end of the cutting edge 121 into the wound and approaches the target area. After the proximal end of the protection sheath 2 contacts or enters the target area, an auxiliary instrument such as an endoscope is combined to determine the cutting angle at which the cutting edge 121 needs to be adjusted around the axis. After the cutting angle is adjusted, the adjustment collar is rotated to move the protection sheath 2 towards the distal end to enter the execution state. The moving distance of the protection sheath 2 is determined according to the specific surgical situation and is characterized by the scale mark 23. After the cutting edge 121 is exposed in the target area, cutting can be carried out. After cutting, the adjustment sleeve 3 is rotated to restore the protection sheath 2 to the inserted state and withdraw it from the patient's body.
Claims
1. A special protective sharp knife for annulus fibrosus incision in UBE surgery, characterized in that, Comprising: A core cutter body, including a holding handle and an execution part, the holding handle and the execution part are coaxially connected; A protective sheath, with a protective cavity internally penetrated, the outer wall of the protective sheath is provided with an external thread, and the protective sheath is sleeved on the outside of the core cutter body; An adjusting sleeve, with an adjusting cavity internally penetrated, the side wall of the adjusting cavity is provided with an internal thread, the adjusting sleeve is sleeved on the outside of the protective sheath, the internal thread meshes with the external thread, and when the adjusting sleeve rotates circumferentially, the protective sheath moves axially on the adjusting sleeve.
2. The special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 1, wherein, The execution part includes a cutting edge and a connecting rod, one end of the connecting rod is connected to the cutting edge, and the other end of the connecting rod is connected to the holding handle.
3. The special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 2, characterized in that, A limiting ring is arranged on the connecting rod, a limiting groove is arranged in the adjusting cavity, and the limiting ring is sleeved in the limiting groove, so that the adjusting sleeve can rotate coaxially with the core cutter body, but the adjusting sleeve cannot move axially along the core cutter body.
4. The special protection sharp knife for annulus fibrosus incision in UBE surgery according to claim 3, characterized in that, The protective sheath includes a probing state and an execution state. In the probing state, the cutting edge is completely retracted into the protective sheath, and at this time, the axial distance between the protective sheath and the holding handle is the farthest; in the execution state, the protective sheath moves axially towards the holding handle, so that the cutting edge extends out of the protective sheath.
5. The special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 4, wherein, The outer wall of the protective sheath is provided with a scale mark. When the protective sheath is in the initial state, one end of the adjusting sleeve is aligned with the zero scale position of the scale mark. When the protective sheath is in the execution state, the scale of the scale mark corresponds to the extending length of the cutting edge.
6. The special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 5, characterized in that, Each side edge of the cutting edge is a cutting part.
7. A special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 1, characterized in that, The axial length of the execution part is not less than 150 mm.
8. A special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 1, characterized in that, The axial length of the protective sheath is not greater than 150 mm.
9. The special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 1, characterized in that, Both ends of the adjusting cavity have openings communicating with the outside, and the maximum outer diameter of the external thread on the protective sheath is greater than the diameter of the opening.
10. A special protective sharp knife for annulus fibrosus incision in UBE surgery according to claim 9, characterized in that, The number of turns of the external thread is less than the number of turns of the internal thread.