Nerve retractor used under two-channel hole endoscope

Abstract

The nerve retractor comprises a first blade, a second blade, a first handle and a second handle, an annular plate is arranged at the near end of the first blade, the first handle is fixedly connected with the annular plate, the second blade is rotationally connected with the second handle on the annular plate, and the first handle is fixedly connected with the annular plate. The first handle and the second handle are both sleeved with handle sleeves. When the second handle gets close to the first handle, the second blade moves in the direction away from the first blade, and the through hole of the annular plate, the second blade and the first blade form a channel; the first blade is shorter than the second blade; a locking piece is arranged between the first handle and the second handle and used for locking the positions of the second handle and the first handle. The double-blade distraction structure is adopted, the problem that the force exerting direction is not easy to grasp during distraction is effectively solved, meanwhile, the working channel formed by the annular plate and the two blades is good in stability, nerve roots can be effectively distraction, and meanwhile instrument operation of a surgeon is not affected.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology, and in particular relates to a nerve retractor for use under a dual-channel endoscope. Background Technology

[0002] Dual-channel endoscopy is a novel minimally invasive spinal surgery technique. It involves making two small incisions at the back of the spine to expand muscles and fascia, creating an operating channel and an observation channel. This allows access to the surgical site. An endoscope is inserted through the observation channel, while tools such as a radiofrequency ablation device, drill, bone forceps, and nucleus pulposus forceps are inserted through the operating channel. These tools are used to remove the lamina and ligaments, release nerve roots, remove the nucleus pulposus, and perform disc-related procedures, including radiofrequency ablation, annulus fibrosus suturing, or implantation of an intervertebral fusion cage. During disc-related procedures, nerve roots must be retracted and protected to expose the surgical site and prevent nerve damage. Nerve damage can lead to incomplete lower limb paralysis or bowel and bladder dysfunction. This invention manufactures an automatic nerve retractor that can stably retract and protect nerve roots. The retraction force is adjustable, easy to operate, and the channel created by the retractor is stable, facilitating the surgeon's operation.

[0003] Currently, during surgery, an assistant primarily uses a nerve retractor to protect and retract the nerve root. Positioned opposite the surgeon, the assistant inserts the L-shaped nerve retractor through the operating port, places it lateral to the nerve root, and then forcefully retracts the nerve root medially to expose the herniated disc nucleus pulposus and the ruptured annulus fibrosus. After securing the nerve retractor, the surgeon enters through the operating channel, avoiding the nerve retractor, and inserts the radiofrequency ablation device, nucleus pulposus clamp, annulus fibrosus suture device, or interbody fusion device to complete the surgical procedure.

[0004] Because the operating channel in minimally invasive surgery is small and deep, the assistant's field of vision is limited, making it difficult to control the force and direction of retraction. Excessive retraction or incorrect retraction may lead to nerve root injury, while insufficient retraction may cause the nerve root to enter the surgical area, obstructing the surgeon's operation or causing nerve root damage. The nerve retractor and the surgeon's instruments being located in the same channel can interfere with each other, potentially affecting the surgeon's operation, leading to prolonged surgery time or surgical errors. Utility Model Content

[0005] To address the above technical problems, this utility model provides a nerve retractor for use under a dual-channel endoscope. It adopts a double-blade spreading structure, which effectively solves the problem of difficulty in controlling the direction of force during spreading. At the same time, the working channel formed by the annular plate and the two blades has good stability and can effectively retract the nerve root without affecting the surgeon's instrument operation.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A nerve retractor for use under a dual-channel endoscope includes: a first blade, a second blade, a first handle, and a second handle. An annular plate is provided at the proximal end of the first blade. The first handle is fixedly connected to the annular plate. The second blade is rotatably connected to the second handle, and the rotatable connection point is on the annular plate. Handle sleeves are provided on both the first handle and the second handle.

[0008] When the second handle moves closer to the first handle, the second blade moves away from the first blade, and the through hole of the annular plate forms a channel with the second blade and the first blade;

[0009] The length of the first blade is less than the length of the second blade;

[0010] A locking mechanism is provided between the first handle and the second handle, the locking mechanism being used to lock the positions of the second handle and the first handle.

[0011] In a preferred embodiment, the locking mechanism is an elastic spring clip with multiple protrusions. The first handle has a through hole. One end of the elastic spring clip is fixed to the second handle, and the other end of the elastic spring clip passes through the first handle, with the protrusions engaging in the through hole.

[0012] In a preferred embodiment, the locking mechanism is a locking plate, one end of which is hinged to the second handle. The locking plate has multiple protrusions, and the first handle has a slot. The protrusions engage with the slot to lock the positions of the first handle and the second handle.

[0013] In a preferred embodiment, the distal end of the second blade has a hook.

[0014] In a preferred embodiment, the width of the first blade is greater than the width of the second blade.

[0015] In a preferred embodiment, the width of the first blade is 1-1.2 cm.

[0016] In a preferred embodiment, the width of the second blade gradually decreases from the proximal end to the distal end.

[0017] In a preferred embodiment, the width of the portion of the second blade near the annular plate is 0.8-1 cm.

[0018] In a preferred embodiment, the proximal portions of the first blade and the second blade have an arc in the width direction.

[0019] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0020] This utility model includes a first blade and a second blade, and an expansion drive mechanism for driving the first blade and the second blade to open. One end of the first blade is provided with an annular plate, and the second blade and the second handle are rotatably connected on the annular plate. When the second handle moves closer to the first handle, it drives the second blade to move away from the first blade, thereby expanding the angle between the second blade and the first blade and realizing the opening of the second blade.

[0021] During the procedure, after the surgeon creates the operating channel, the first and second blades are inserted into it. The second blade is used to retract the nerve root. Because the second blade is longer than the first blade, the first blade is supported by soft tissue and also prevents soft tissue, muscle, fat, etc., from obstructing the operating channel. When the second handle moves closer to the first handle, the second blade moves away from the first blade, retracting the nerve root and exposing the surgical field. Thus, the first blade, the second blade, and the through-hole of the annular plate form a stable working channel. The surgeon can insert instruments (such as nucleus pulposus forceps, radiofrequency ablation tips, annulus fibrosus suture devices, interbody fusion devices, etc.) through the through-hole of the annular plate. The channel formed by the first and second blades is stable and does not obstruct instrument operation. After the surgical procedure is completed, the second blade moves closer to the first blade to relax the retracted nerve root. The first and second blades, now joined together, are then removed from the operating channel. Therefore, this utility model adopts a double-blade opening structure, which can effectively solve the problem of difficulty in controlling the direction of force when opening. Moreover, the working channel formed by the through hole of the annular plate and the two blades has good stability, and can effectively retract the nerve root without affecting the surgeon's instrument operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a dual-channel endoscopic nerve retractor according to an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of a dual-channel endoscopic nerve retractor according to an embodiment of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the nerve retractor in the open state under the dual-channel endoscope according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1-First blade; 2-Second blade; 3-Hook; 4-Annular plate; 5-First handle; 6-Second handle; 7-Elastic retaining spring; 8-Protrusion; 9-Arc shape; 10-Through hole. Detailed Implementation

[0026] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the dual-channel endoscopic nerve retractor proposed in this invention. The advantages and features of this invention will become clearer from the following description.

[0027] See Figure 1-3 A nerve retractor for use under a dual-channel endoscope includes: a first blade 1, a second blade 2 and an expansion drive mechanism. An annular plate 4 is provided at the proximal end of the first blade 1. The expansion drive mechanism is connected to the annular plate 4. The connection between the expansion drive mechanism and the annular plate 4 is connected to the second blade 2. The expansion drive mechanism is used to drive the second blade 2 to move away from the first blade 1.

[0028] The length of the first blade 1 is less than the length of the second blade 2.

[0029] In this embodiment, since the second blade 2 is connected to the expansion drive mechanism on the annular plate 4, and the first blade 1 is fixedly connected to the annular plate 4, the expansion drive mechanism can drive the second blade 2 to move away from the first blade 1, thereby increasing the angle formed between the second blade 2 and the first blade 1. Therefore, the second blade 2 can be used to retract the nerve root. The first blade 1 is relatively short and forms a support point in the soft tissue, preventing muscles, fat, and other soft tissues from obstructing the operating channel. The distal end of the first blade 1 is preferably designed as an arc 9, that is, with rounded corners, to prevent further cutting of the soft tissue. Therefore, the first blade 1, the second blade 2, and the through hole 10 of the annular plate 4 form a stable channel. The doctor's operating instruments can be inserted and operated through the through hole 10 of the annular plate 4. The channel formed by the first blade 1 and the second blade 2 is stable and does not hinder the operation of the instruments.

[0030] In this embodiment, the expansion drive mechanism includes a first handle 5 and a second handle 6, and handle sleeves are fitted on both the first handle 5 and the second handle 6 to increase comfort.

[0031] The first handle 5 is fixedly connected to the annular plate 4, and the second blade 2 is rotatably connected to the second handle 6, with the rotatable connection point on the annular plate 4. When an external force is applied to the second handle 6, and the second handle 6 moves toward the first handle 5, it can drive the second blade 2 to move away from the first blade 1, thereby increasing the angle between the second blade 2 and the first blade 1, that is, the second blade 2 and the first blade 1 are spread apart. After the force of the second handle 6 disappears, the second blade 2 returns to its original position, that is, the second blade 2 is closed.

[0032] In order to maintain the closed position of the second blade 2 and keep the channel formed by the second blade 2 and the first blade 1 during the operation, a locking mechanism is set between the first handle 5 and the second handle 6. The locking mechanism is used to lock the position of the second handle 6 and the first handle 5. That is, after the force on the second handle 6 is removed, the position of the second handle 6 and the first handle 5 remains unchanged due to the action of the locking mechanism, thus maintaining the opening angle of the second blade 2.

[0033] In a preferred embodiment, the locking mechanism is an elastic spring clip 7, which has a plurality of protrusions 8. The first handle 5 has a through hole with a slot for engaging the protrusions 8. One end of the elastic spring clip 7 is fixed to the second handle 6, and the other end of the elastic spring clip 7 passes through the first handle 5, with the protrusions 8 engaging in the slot of the through hole.

[0034] When the second handle 6 moves toward the first handle 5, the elastic retaining spring 7 springs up and engages with the slot in the through hole of the first handle 5 via the toothed protrusion 8 on the elastic retaining spring 7. This allows for step-by-step control of the opening force and range. Simultaneously, the engagement of the protrusion 8 with the slot prevents the second handle 6 and the first handle 5 from returning to their original positions, thus preventing damage to the nerve root due to the second leaf 2 failing to open. After the surgical procedure is completed, pressing down on the elastic retaining spring 7 gradually separates the second handle 6 and the first handle 5, causing the second leaf 2 and the first leaf 1 to move closer together, relaxing the retracted nerve root.

[0035] The protrusion 8 can be a toothed protrusion 8, and a toothed groove that meshes with the toothed protrusion 8 is provided in the through hole.

[0036] In another embodiment, the locking mechanism is a locking plate, one end of which is hinged to the second handle 6. The locking plate has multiple protrusions 8, and the first handle 5 has a slot. The protrusions 8 are engaged in the slot to lock the positions of the first handle 5 and the second handle 6.

[0037] When the second handle 6 moves towards the first handle 5 at a certain position, the second blade 2 opens, retracting the nerve root and exposing the surgical site. At this point, the protrusion 8 on the locking plate can be engaged with the slot on the first handle 5, thus fixing the position of the second handle 6. Since the locking plate has multiple protrusions 8, the opening force and range can be controlled stepwise. Simultaneously, the engagement of the protrusions 8 with the slots prevents the second handle 6 and the first handle 5 from returning to their original positions, thus preventing damage to the nerve root due to the second blade 2 failing to open. After the surgical procedure is completed, separating the protrusions 8 from the slots allows the second handle 6 and the first handle 5 to separate, and the second blade 2 and the first blade 1 to come together, relaxing the retracted nerve root.

[0038] Since the second leaflet 2 is located on the outside of the nerve root, a hook 3 is provided at the distal end of the second leaflet 2. The hook 3 is placed on the ventral side of the nerve root to prevent the nerve root from sliding out from the distal end of the second leaflet 2.

[0039] Since the function of the first leaf 1 is to block the muscle to form a soft tissue operation channel, it is preferable that the width of the first leaf 1 is greater than the width of the second leaf 2, so that the blocking effect is better. Preferably, the width of the first leaf 1 is 1-1.2cm, which is more suitable for the operation channel formed during minimally invasive spinal surgery.

[0040] Because the first and second blades form a channel, the first blade blocks soft tissues such as muscles, and the proximal end of the second blade can also block the action of soft tissues such as muscles. Therefore, the width of the second blade 2 gradually decreases from the proximal end to the distal end. The main function of the second blade 2 is to retract the nerve root, but the proximal part contacts soft tissue and has a certain width to block muscles, while the distal part retracts the nerve root and has a narrower width. Preferably, the width of the proximal part of the second blade 2 is 0.8-1 cm. Furthermore, the first blade 1 has a certain curvature in the width direction, and the proximal part of the second blade 2 also has a certain curvature in the width direction. Moreover, the curvatures of the first blade 1 and the second blade 2 are set opposite to each other. Within the operating channel, the first blade 1 and the second blade 2 more easily form a tubular channel. The channel formed by the first blade 1 and the second blade 2 is more stable, and the effect of blocking soft tissue is better, thereby increasing the surgical operating space.

[0041] Taking the elastic retaining spring 7 as an example, the working principle of the nerve retractor of this application is explained:

[0042] During the surgery, the surgeon makes two small incisions behind the spine to expand the muscles and fascia, creating an operating channel and an observation channel. A spinal endoscope is inserted through the observation channel, with the first blade 1 and the second blade 2 inserted into the operating channel. The second blade 2 is positioned lateral to the nerve root, and the hook 3 is positioned ventral to the nerve root to prevent it from slipping out from the distal end of the second blade 2. The first blade 1 is supported at the operating channel formed by the muscles and clamps the handle. When the second handle 6 moves towards the first handle 5, the second blade 2 moves away from the first blade 1. This movement retracts the nerve root, exposing the surgical field. As the second blade 2 moves away from the first blade 1, the elastic retaining spring 7 springs up and engages with the through-hole of the first handle 5 via a toothed protrusion 8. This allows for step-by-step control of the retraction force and range. Simultaneously, the engagement of the protrusion 8 with the through-hole prevents the second handle 6 and the first handle 5 from returning to their original positions, thus preventing damage to the nerve root due to the second blade 2's failure to retract. The second leaflet 2 and the first leaflet 1 are located within the muscle channel, preventing them from sliding or rotating distally or proximally, which could cause incorrect nerve root retraction and damage. Surgical instruments (such as nucleus pulposus forceps, radiofrequency ablation blades, annulus fibrosus suture devices, interbody fusion devices, etc.) can be inserted through the through-hole 10 of the annular plate 4. The channel formed by the first leaflet 1 and the second leaflet 2 is stable and does not obstruct instrument operation.

[0043] After the surgical procedure is completed, press down on the elastic retaining spring 7, and the protrusion 8 will disengage from the slot in the through hole. The second handle 6 and the first handle 5 can then be separated step by step, and the second blade 2 and the first blade 1 can be brought closer together to relax the pulled nerve root. The joined first blade 1 and second blade 2 can then be removed from the operating channel.

[0044] The distance between the first and second blades in their retracted state can be set arbitrarily according to actual needs; the accompanying drawings in this application are merely illustrative.

[0045] This invention employs a double-blade opening structure, effectively solving the problem of difficulty in controlling the direction of force during opening. Using elastic spring clips or locking plates, it allows for step-by-step opening and adjustment, facilitating control of the opening force and range, while preventing the opening blades from causing opening failure. The through-hole of the annular plate and the working channel formed by the two blades provide good stability, effectively retracting the nerve root without affecting the surgeon's instrument operation.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A nerve retractor for use under a dual-port endoscope, characterized in that, include: The first blade, the second blade, the first handle, and the second handle are provided with an annular plate at the proximal end of the first blade, the first handle is fixedly connected to the annular plate, the second blade is rotatably connected to the second handle, and the rotatable connection point is on the annular plate. The first handle and the second handle are both fitted with handle sleeves. When the second handle moves closer to the first handle, the second blade moves away from the first blade, and the through hole of the annular plate forms a channel with the second blade and the first blade; The length of the first blade is less than the length of the second blade; A locking mechanism is provided between the first handle and the second handle, the locking mechanism being used to lock the positions of the second handle and the first handle.

2. The dual-port endoscopic nerve retractor according to claim 1, characterized in that, The locking mechanism is an elastic spring clip with multiple protrusions. The first handle has a through hole. One end of the elastic spring clip is fixed to the second handle, and the other end of the elastic spring clip passes through the first handle, with the protrusions engaging in the through hole.

3. The dual-port endoscopic nerve retractor according to claim 1, characterized in that, The locking mechanism is a locking plate, one end of which is hinged to the second handle. The locking plate has multiple protrusions, and the first handle has a slot. The protrusions engage with the slot to lock the positions of the first handle and the second handle.

4. The dual-channel endoscopic nerve retractor according to claim 1, characterized in that, The distal end of the second blade has a hook.

5. The dual-channel endoscopic nerve retractor according to claim 1, characterized in that, The width of the first blade is greater than the width of the second blade.

6. The dual-port endoscopic nerve retractor according to claim 1, characterized in that, The proximal portions of the first and second blades have an arc in the width direction.

7. The dual-port endoscopic nerve retractor according to claim 1 or 6, characterized in that, The width of the first blade is 1-1.2 cm.

8. The dual-port endoscopic nerve retractor according to claim 1, characterized in that, The width of the second blade gradually decreases from the proximal end to the distal end.

9. The dual-channel endoscopic nerve retractor according to claim 8, characterized in that, The width of the portion of the second blade near the annular plate is 0.8-1 cm.

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