Spine large channel endoscope trephine anchoring positioning nail
By designing a large-channel endoscopic circumferential saw anchoring and positioning screw, the problem of difficult operation of the visual circumferential saw on the lamina surface was solved, achieving precise cutting and smooth circumferential laparotomy, and reducing iatrogenic injury.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 徐建华
- Filing Date
- 2025-01-08
- Publication Date
- 2026-04-17
AI Technical Summary
In large-channel endoscopic surgery of the spine, existing visual trephine saws are difficult to operate on the lamina surface, resulting in trephine slippage, inaccurate cutting, time and labor costs, and may lead to iatrogenic spinal instability and dural injury.
A spinal endoscopic ring saw anchoring and positioning screw with a large channel was designed, including a stepped sleeve and a central anchoring screw. The stepped sleeve fits into the endoscope, the tip of the central anchoring screw quickly enters the lamina surface, the depth limit prevents over-cutting, the screw shaft provides stability, and the screw tail facilitates installation, achieving precise cutting and preventing bone fragments from falling out.
It improves the precision and smoothness of circumcision laminectomy, reduces the labor intensity of operators, prevents dural tears and bone fragment dislocation, and simplifies the operation process.
Smart Images
Figure CN224126011U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical devices, specifically a spinal large-channel endoscopic circumferential saw anchoring and positioning nail. Background Technology
[0002] Medical devices refer to instruments, equipment, appliances, in vitro diagnostic reagents and calibrators, materials and other similar or related items that are used directly or indirectly on the human body, including the necessary computer software. Medical devices include medical equipment and medical consumables.
[0003] Spinal endoscopy is a medical procedure used to diagnose and treat spinal diseases. Depending on the condition, doctors will choose different types of spinal endoscopes, including standard spinal endoscopes and large-port spinal endoscopes. Percutaneous spinal endoscopy is a minimally invasive technique that uses a small incision in the skin to access the lesion for examination or treatment. During percutaneous spinal endoscopy, doctors use imaging techniques such as CT, MRI, or X-rays to locate the lesion and determine the optimal target path. The advantages of percutaneous spinal endoscopy are minimal trauma and rapid recovery, making it suitable for the diagnosis and treatment of most spinal diseases. Large-port spinal endoscopy is a more complex procedure that requires the removal of a significant amount of bony tissue from the spinal canal endoscopically to directly reach the lesion for treatment. During large-port spinal endoscopy, doctors use tools such as bone scalpels and circular bone saws, selecting different surgical approaches depending on the location of the lesion. The advantage of large-port spinal endoscopy is that it allows for direct and rapid access to the lesion, making it suitable for severe spinal diseases requiring interbody fusion surgery.
[0004] For example, the LUSTA spinal endoscope, commonly used in clinical practice, places the outer cannula and the visual ring saw device on the surface of the lamina of the diseased intervertebral space, so that the visual ring saw is aligned with the spinous process of the lamina. Then, the visual ring saw is controlled to rotate deep into the lamina, cutting into the bone of the patient's lamina. However, the actual operation is more difficult. The visual ring saw is at the top of the patient's lamina surface, and the operator observes the ring saw descending to the patient's lamina position with the naked eye. When the ring saw moves downward, the ring saw teeth cannot completely fit the surface of the lamina bone, the ring saw teeth are subjected to uneven force, and the ring saw slips, resulting in inaccurate circumcision of bone. At the same time, repeated calibration of the ring saw position is time-consuming and laborious, the operation is relatively cumbersome, and the area of circumcision of the lamina bone is large, which may lead to iatrogenic spinal instability (more bone removal) and dura mater injury. Utility Model Content
[0005] To address the aforementioned technical problems, this utility model provides a spinal large-channel endoscopic circumferential saw anchoring and positioning screw, which aims to reduce the labor intensity of operators and improve the accuracy and smoothness of circumferential laminectomy.
[0006] To achieve its technical objectives, this utility model adopts the following technical solution:
[0007] A spinal cannula circumferential saw anchoring and positioning screw includes a series of sleeves and a central anchoring screw. The series of sleeves can be detachably installed inside the spinal cannula and fit against the inner wall of the spinal cannula. The central anchoring screw is slidably installed inside the series of sleeves. The central anchoring screw has a tip, a depth limiting part, a shank part and a tail part arranged sequentially from head to tail. The tip and tail parts protrude from both ends of the spinal cannula.
[0008] Preferably, the outer periphery of the tail end of the progressive sleeve is provided with a depth-limiting tail block for restricting the position of the progressive sleeve.
[0009] More preferably, the outer diameter of the depth-limiting tail block is larger than the inner diameter of the spinal endoscope.
[0010] Preferably, the tip of the nail is triangular in shape and the length of the tip is 6mm. The tip can quickly penetrate the bone surface of the vertebral lamina when struck.
[0011] More preferably, the tip of the nail is provided with an anti-backward groove to prevent the anchor nail from dislodging and the bone block from falling off.
[0012] Preferably, the depth limiting portion is provided with a depth limiting block for preventing excessively deep anchoring by hammering, and the diameter of the depth limiting block is 2.5 mm larger than the diameter of the nail tip.
[0013] Preferably, the nail rod is a metal rod with a diameter of 5mm and a length of 30mm.
[0014] More preferably, the surface of the nail rod is provided with a vertical protrusion, and the inner wall of the progressive sleeve is provided with a groove that matches the vertical protrusion. The central anchor nail is slidably installed inside the progressive sleeve through the mutually matching vertical protrusion and groove.
[0015] Preferably, the tail of the nail is provided with a quick-connect connector.
[0016] Preferably, the progressive sleeves are made of silicone.
[0017] The beneficial effects of this invention are as follows: Before circumferentially cutting the lamina bone, the operator can nail the central anchor pin to the surface of the patient's lamina, making it convenient to visually observe the precise position of the circumferential saw cutting the bone and ensuring the accuracy of the circumferential saw cutting the bone; when the circumferential saw cuts deep into the bone, if the anchor pin rotates together with the circumferentially cut bone block when the deep bone of the patient's lamina is cut through, the rotation of the circumferential saw should be stopped immediately to prevent tearing of the deep dura mater. At the same time, the anchor pin can be used to lift the bone block to prevent it from falling out of the circumferential saw hole; this invention is simple to operate and highly practical, reducing workload while improving the accuracy and smoothness of circumferential laminectomy. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model assembled inside a spinal endoscope with a large channel.
[0019] Figure 2 This is a front view of the central anchor pin of this utility model;
[0020] Figure 3 This is a three-dimensional structural diagram of the step-by-step sleeve of this utility model;
[0021] Figure 4 yes Figure 3 Top view.
[0022] Figure label:
[0023] 1. Step-by-step sleeve; 101. Depth-limiting tail block; 102. Groove;
[0024] 2. Center anchor pin; 201. Anti-backward groove; 202. Depth limiting block; 203. Vertical protrusion; 204. Quick-connect coupling.
[0025] 3. Spinal endoscopy with large-portal spinal cannula;
[0026] 4. Ring saw. Detailed Implementation
[0027] In the description of this utility model, it should be noted that the terms "upper / lower", "front / rear", "first / last", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within the components of a compatible model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, unless otherwise specified, all components used in this application are commercially available components, and the connection between different components can be achieved through conventional technical means.
[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0030] This utility model provides a spinal large-channel endoscopic circumferential saw anchoring and positioning screw, such as Figure 1 As shown, it includes a stepped sleeve 1 and a central anchor pin 2; the stepped sleeve 1 can be detachably installed inside the spinal endoscope 3 and fits against the inner wall of the spinal endoscope 3; the central anchor pin 2 is slidably installed inside the stepped sleeve 1, and the central anchor pin 2 is provided with a pin tip, a depth limiting part, a pin shank part and a pin tail part from head to tail. The pin tip and pin tail part protrude from both ends of the spinal endoscope 3, that is, in the initial state, the pin tip protrudes from the ring saw 4 at the front end of the spinal endoscope 3.
[0031] like Figure 3 As shown, preferably, a depth-limiting tail block 101 is provided on the outer periphery of the tail of the step-by-step sleeve 1 to limit the position of the step-by-step sleeve 1.
[0032] As a better alternative, the depth limiting tail block 101 has an annular cross-section and the outer diameter of the depth limiting tail block 101 is larger than the inner diameter of the spinal large-channel endoscope 3. The depth limiting tail block 101 can limit the position of the step-by-step cannula 1 when installing the step-by-step cannula 1, so as to prevent the whole thing from falling into the spinal large-channel endoscope 3.
[0033] like Figure 2 As shown, preferably, the tip of the screw is triangular in shape and the length of the tip is 6mm. If it is too long, it will easily penetrate the lamina, and if it is too short, the anchoring of the lamina bone will be unstable. This length is more suitable in the operation verification. The tip of the screw can quickly enter the surface bone of the lamina after being tapped.
[0034] As a better option, the tip of the screw is provided with an anti-reverse groove 201 to prevent the anchor screw from dislodging and the bone fragment from falling off. This design makes it easier for the entire tip of the screw to penetrate the bone and be fixed in the bone layer, preventing repeated operations and reducing the impact on the patient.
[0035] Preferably, the depth limiting part is provided with a depth limiting block 202 to prevent excessively deep tapping and anchoring, thereby avoiding further damage to the deep dura mater nerve tissue. The diameter of the depth limiting block 202 is 2.5 mm larger than the diameter of the nail tip.
[0036] Preferably, the nail rod is a metal rod with a diameter of 5mm and a length of 30mm.
[0037] As a preferred embodiment, the surface of the nail rod is provided with a vertical protrusion 203, and the inner wall of the step sleeve 1 is provided with a groove 102 that matches the vertical protrusion 203. The central anchor nail 2 is slidably installed inside the step sleeve 1 through the mutually matching vertical protrusion 203 and groove 102. The central anchor nail 2 can slide freely in the step sleeve 1, which facilitates installation and further anchoring work, and also makes it easy to lift the cut bone block after cutting.
[0038] Preferably, the tail of the nail is provided with a quick-connect connector 204.
[0039] As a preferred option, the step-by-step cannula 1 is made of silicone material, which can reduce mechanical damage to the spinal endoscope 3 caused by the impact positioning screws.
[0040] The specific operation method of this utility model is as follows:
[0041] Install the stepped cannula 1 and place it inside the spinal cannula endoscope 3. Under the action of the depth-limiting tail block 101, the stepped cannula 1 is secured inside the spinal cannula endoscope 3. Install the central anchor pin 2, aligning the vertical protrusion 203 of the central anchor pin 2 with the groove 102 of the stepped cannula 1. Slide the central anchor pin 2 into the stepped cannula 1, ensuring the tip of the pin protrudes beyond the circumferential saw 4 at the front end of the spinal cannula endoscope 3. Begin the cutting operation, observing the precise location of the bone to be cut by the circumferential saw 4. Position the central anchor pin 2 on the surface of the patient's vertebral lamina. Fix the saw, then drive the ring saw 4 to rotate. At this time, the ring saw 4 and the central anchor pin 2 are in a concentric circle. When the deep bone of the patient's vertebral lamina is cut through, the cut bone piece will rotate under the drive of the ring saw 4, which in turn drives the central anchor pin 2 to rotate. At this time, the rotation of the central anchor pin 2 can be clearly seen, indicating that the ring saw 4 has cut through the deep bone. Stop cutting immediately to prevent tearing of the deep dura mater. At the same time, lift the central anchor pin 2, taking the cut bone piece with it, to prevent the bone piece from falling into the hole cut by the ring saw 4 and to prevent the need for repeated cutting. This completes the entire cutting work.
[0042] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.
Claims
1. A spinal large-channel endoscopic circumferential saw anchoring and positioning screw, characterized in that, It includes a stepped cannula and a central anchor pin; the stepped cannula can be detachably installed inside the spinal cannula and fits against the inner wall of the spinal cannula; the central anchor pin is slidably installed inside the stepped cannula, and the central anchor pin is provided with a pin tip, a depth limiting part, a pin shank part and a pin tail part from head to tail, and the pin tip and pin tail part protrude from both ends of the spinal cannula.
2. A large channel endoscope for spine anchor positioning nail according to claim 1, characterized in that, The outer periphery of the tail end of the progressive sleeve is provided with a depth-limiting tail block for restricting the position of the progressive sleeve.
3. A large channel endoscope for spine anchor positioning nail according to claim 2, characterized in that, The outer diameter of the depth-limiting tail block is larger than the inner diameter of the spinal endoscope with large channel.
4. A large channel endoscope for spine anchor positioning nail according to claim 1, characterized in that, The tip of the nail is triangular in shape and 6mm in length. The tip can quickly penetrate the bone surface of the vertebral lamina when struck.
5. The spinal large-channel endoscopic circumferential saw anchoring and positioning screw as described in claim 4, characterized in that, The tip of the nail is provided with an anti-backward groove to prevent the anchor nail from coming loose and the bone block from falling off.
6. A large channel endoscope for spine anchor positioning nail according to claim 1, characterized in that, The depth limiting part is provided with a depth limiting block to prevent excessive hammering and anchoring. The diameter of the depth limiting block is 2.5 mm larger than the diameter of the nail tip.
7. A large channel endoscope for spine anchor positioning according to claim 1, wherein, The nail rod is a metal rod with a diameter of 5mm and a length of 30mm.
8. A large channel endoscope for spine anchor positioning nail according to claim 7, characterized in that, The surface of the nail rod is provided with a vertical protrusion, and the inner wall of the progressive sleeve is provided with a groove that matches the vertical protrusion. The central anchor nail is slidably installed inside the progressive sleeve through the mutually matching vertical protrusion and groove.
9. A large channel endoscope for spine anchor positioning according to claim 1, wherein, The tail of the nail is provided with a quick-connect fitting.
10. A large channel endoscope for spine anchor positioning nail according to claim 1, characterized in that, The progressive sleeves are made of silicone.