An endoscopic suture device for the skull base dura mater

Abstract

The present invention discloses a suture device for endoscopic skull base dura mater, which comprises a suture mechanism, an operating rod and a handle connected in sequence. The suture mechanism includes a housing, a transmission assembly and an annular needle assembly. The transmission assembly includes a rack, a pinion of the driving wheel, a large gear of the driving wheel, an idler wheel and a driven wheel connected in sequence. The pinion of the driving wheel and the large gear of the driving wheel are coaxially arranged. By adopting the transmission mode of driving the pinion of the driving wheel with the rack and then driving the large gear of the driving wheel coaxially, the overall size of the suture device can be effectively reduced, which is convenient for entering the skull base from the nasal cavity to carry out dura mater suture surgery. It has the advantages of being able to suture in a narrow environment, realizing continuous suture and having simple operation, which is beneficial to improving the surgical efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to a suture device for endoscopic cranial base dura mater. Background Art

[0002] For a long time, neuroendoscopic surgery has become one of the important surgical methods in skull base surgery. Tumors in the skull base area can be ideally surgically removed through the transnasal endoscopic approach. The advantages of neuroendoscopic surgery are obvious: there is a close surgical field of view, mild postoperative reactions, less damage to nerve function, and quick postoperative recovery.

[0003] Successful anterior skull base surgery requires tight suture to prevent postoperative cerebrospinal fluid leakage. Thus, an important barrier is built between the cranial cavity and the extracranial region, sinuses, and nasal cavity, reducing the risk of complications such as intracranial infection and meningitis.

[0004] Currently, conventional instruments used for skull base repair include micro scissors, micro grasping forceps, micro electrocoagulation, etc. However, these instruments have the following defects during skull base repair:

[0005] 1. Basic instruments and materials only meet the basic requirements of surgical suture.

[0006] 2. A certain suture space is required, which conflicts with the narrow operating environment under the endoscope.

[0007] 3. It is difficult to guarantee the success rate of suture for complex and irregular wound surfaces.

[0008] These defects affect the clinical treatment effect. Therefore, there is an urgent need for a suture instrument with a small size and flexible operation to conveniently and quickly complete the endoscopic dura mater suture surgery and reduce the pain of patients. Summary of the Invention

[0009] In order to overcome the above technical defects, meet the clinical requirements of endoscopic dura mater suture surgery, and improve the success rate of the surgery, the present invention provides a suture device for endoscopic cranial base dura mater, which has the advantages of small size, convenient and flexible operation, being able to achieve suture in a narrow environment, and having uniform suture and reducing secondary damage.

[0010] The technical solution of the present invention is realized as follows:

[0011] In a first aspect of the present invention, there is provided a suture device for endoscopic cranial base dura mater, which includes a suture mechanism, an operating rod, and a handle connected in sequence. The suture mechanism includes a housing, a transmission assembly, and an annular needle assembly.

[0012] One end of the transmission assembly is connected to the operating rod, and the other end is connected to the annular needle assembly.

[0013] The transmission assembly includes a rack, a pinion of the driving wheel, a large gear of the driving wheel, an idler gear and a driven wheel, which are connected in sequence. The pinion of the driving wheel and the large gear of the driving wheel are coaxially arranged.

[0014] Further, a groove adapted to the shape of the rack is formed in the housing, and the rack is installed in the groove and connected by a clamping action.

[0015] Further, the transmission assembly further includes an upper cover of the large gear of the driving wheel, a connecting pin of the driving wheel, an upper cover of the driven wheel, a connecting pin of the driven wheel and a connecting rod, and the large gear of the driving wheel, the driven wheel, the upper cover of the large gear of the driving wheel and the upper cover of the driven wheel have the same size to ensure that the rotation speed and rotation direction of the large gear of the driving wheel and the driven wheel are the same during transmission.

[0016] Further, a connecting pin of the driving wheel and a connecting pin of the driven wheel are respectively arranged at the same positions on the upper cover of the large gear of the driving wheel and the upper cover of the driven wheel, and the upper cover of the large gear of the driving wheel and the upper cover of the driven wheel are respectively connected to the connecting rod through the connecting pin of the driving wheel and the connecting pin of the driven wheel.

[0017] When the rack moves, it drives the pinion of the driving wheel to rotate (such as counterclockwise rotation). Since the pinion of the driving wheel and the large gear of the driving wheel are coaxially arranged, it further drives the large gear of the driving wheel to rotate in the same direction (such as counterclockwise rotation). The large gear of the driving wheel drives the idler gear to rotate in the opposite direction (such as clockwise rotation), and the idler gear drives the driven wheel to rotate in the opposite direction (such as counterclockwise rotation), realizing the same-direction rotation of the large gear of the driving wheel and the driven wheel. Since the connecting pin of the driving wheel and the connecting pin of the driven wheel are in the same positions on the upper cover of the large gear of the driving wheel and the upper cover of the driven wheel, the connecting pin of the driving wheel and the connecting pin of the driven wheel can perform semi-circular translation in the same vertical plane, driving the connecting rod to perform semi-circular translation synchronously, ensuring that the connecting rod is parallel to the central axis of the sewing mechanism, thereby realizing the stable movement of the circular needle in the circular needle assembly.

[0018] Further, the circular needle assembly includes a circular needle rotation positioning module, a circular needle and a circular needle mounting module.

[0019] Further, a plurality of positioning grooves are arranged on the outer side of the circular needle, the positioning grooves are evenly distributed on the circular needle, a plurality of thrust grooves are arranged on the lower side of the circular needle, the thrust grooves are evenly distributed on the circular needle, and the positioning grooves and thrust grooves are stepped on the side close to the needle tip and beveled on the side close to the needle tail.

[0020] In a specific embodiment of the present invention, the circular needle is in an arc shape of 240°. There are 3 thrust grooves on one side of the circular needle, which are respectively located at the positions of 30°, 120° and 210° of the circular needle. There are 2 positioning grooves on the outer side of the circular needle, which are respectively located at the positions of 30° and 210° of the circular needle.

[0021] Furthermore, the annular needle rotation positioning module includes a spring pin and a thrust positioning piece.

[0022] Furthermore, one end of the spring pin is fixed to the connecting rod of the transmission assembly, and the other end is buckled in the thrust groove of the annular needle; when the connecting rod moves, the spring pin can squeeze the stepped part of the thrust groove to push the annular needle to rotate. When the annular needle is stationary, the spring pin retreats along the inclined surface of the thrust groove, slides out of the thrust groove, and enters the next thrust groove. In this way, the annular needle continuously advances the needle.

[0023] Furthermore, one end of the thrust positioning piece is fixed to the housing of the sewing mechanism, and the other end is buckled in the positioning groove of the annular needle, so that the thrust positioning piece can squeeze the stepped part of the positioning groove to hold the annular needle and prevent the annular needle from retracting the needle. When the annular needle rotates, the thrust positioning piece retreats along the inclined surface of the positioning groove and slides out of the positioning groove. When the annular needle is stationary, the thrust positioning piece enters the next positioning groove and holds the step of the positioning groove. In this way, the annular needle continuously advances the needle.

[0024] Furthermore, the annular needle mounting module is arranged at the front end of the sewing mechanism. An arc-shaped groove adapted to the annular needle is provided at the front end of the annular needle mounting module for mounting the annular needle, and the opening of the groove faces the front of the stapler.

[0025] Furthermore, the operating rod includes an outer tube and an inner tube.

[0026] The central axes of the inner tube and the outer tube coincide. The inner tube penetrates through the outer tube and can rotate around the central axis. One end of the inner tube is connected to the handle, and the other end of the inner tube is fixedly connected to the transmission assembly.

[0027] Furthermore, the specific connection method of the fixed connection between the inner tube and the rack is not limited, as long as the inner tube and the rack can be fixed into one body, such as riveting, snap connection, bolt connection, etc.

[0028] Furthermore, the handle includes a wrench, a handwheel, a thrust transmission rod, a wrench return spring, and a handle housing.

[0029] Furthermore, the thrust transmission rod includes a hollow rod-shaped body and a convex block. One end of the hollow rod-shaped body is sleeved on the inner tube of the operating rod, and the other end is connected to the convex block.

[0030] A hole adapted to the hollow rod-shaped body is provided at the center of the handwheel, and the handwheel is sleeved on the hollow rod-shaped body. When the handwheel is rotated, the hollow rod-shaped body is driven to rotate synchronously, thereby driving the inner tube to rotate.

[0031] Further, the wrench return spring is sleeved on the hollow rod-shaped body, and one end of the wrench return spring is connected to the bump, and the other end is fixedly connected to the handle housing.

[0032] When the handwheel is rotated, the hollow rod-shaped body is driven to rotate, thereby driving the inner tube to rotate, and then driving the rack to rotate. Since the rack is engaged with the groove of the suture mechanism housing, the entire suture mechanism and the annular needle assembly are driven to rotate, and the position and angle of the annular needle entering the dura mater can be adjusted, improving the accuracy of the surgery.

[0033] The wrench includes a pulling end and a clamping end, and the clamping end is snap-connected to the tail of the hollow rod-shaped body.

[0034] Further, the handle further includes a wrench limit block, a serrated structure, a limit button and a limit button return spring.

[0035] The serrated structure is arranged in the middle of the wrench; further, the serrated structure is integrally formed with the wrench.

[0036] The limit button is in a "T" shape, one end of which can be engaged with the serrated structure, the other end is connected to one end of the limit button return spring, and the middle of the limit button is fixed on the handle housing through a shaft. The handle end of the limit button can rotate around the shaft.

[0037] Further, the wrench limit block is used to limit the handle end of the limit button.

[0038] Further, the other end of the limit button return spring is fixed on the handle housing.

[0039] When the pulling end of the wrench is pulled, the clamping end of the wrench pushes the thrust transmission rod and compresses the wrench return spring, thereby pushing the inner tube in the operating rod towards the suture mechanism, driving the rack connected to the inner tube to advance, pushing the pinion of the driving wheel to rotate (such as counterclockwise), and then driving the large gear of the driving wheel, the idler wheel and the driven wheel to rotate in sequence, causing the connecting rod to move, thereby driving the spring pin to move, and then pushing the annular needle to penetrate through the spring pin for suture operation.

[0040] When the wrench is pulled, the serrated structure of the wrench is engaged with one end of the limit button, and the limit button rotates counterclockwise around the fixed shaft and gradually approaches the wrench limit block. When it continues to move until the wrench limit block catches the limit button, the wrench stops moving, and the thrust transmission rod, the inner tube, the rack, the pinion of the driving wheel, the large gear of the driving wheel, the idler wheel, the driven wheel, the connecting rod and the spring pin are all in a static state. At this time, the spring pin contacts the step of the thrust groove of the annular needle and cannot push the annular needle to rotate.

[0041] When the engagement of the wrench limit block with the limit button is released, the serrated structure of the wrench is no longer engaged with the limit button, and the limit button reset spring gradually resets, pulling the limit button to rotate clockwise, and at the same time loosening the pulling end of the wrench, the wrench reset spring resets, and the pulling end of the wrench gradually resets, driving the thrust transmission rod and the wrench clamping end to retreat, and driving the inner tube and the rack to retreat, and the driving wheel pinion rotates in the opposite direction (clockwise), driving the driving wheel gear, the idler wheel and the driven wheel to rotate in the opposite direction (clockwise), and the connecting rod moves at the same time, the thrust positioning sheet can squeeze the step part of the positioning groove, support the annular needle, and prevent the annular needle from retreating, and the spring pin slides out of the thrust groove along the inclined surface of the thrust groove of the annular needle, completing one plate movement operation of the wrench.

[0042] Further, the trajectory of the annular needle is a duplicate of the pin trajectory of the fixed connecting rod.

[0043] Furthermore, the suture device also includes a wire pulling mechanism.

[0044] The wire pulling mechanism comprises a tubular base, a wire pulling and a wire pulling driving wheel; one end of the wire pulling is a spring contraction clamp located at the tail of the circular needle, used to clamp and pull the suture thread of the circular needle through the dura mater during suturing; the other end is a "T"-shaped push rod, which passes through the tubular base, the inner tube and the hollow rod-shaped body in sequence;

[0045] Furthermore, the wire driving wheel is fixed in the handle housing.

[0046] Furthermore, the pull wire can be a steel wire with certain elasticity. A soft wire connected to the pull wire is arranged at any position of the inner tube of the operating rod, and the other end of the soft wire is connected to the pull wire driving wheel, and the pull wire driving wheel drives the pull wire to move through the soft wire.

[0047] Furthermore, the tubular base is preferably made of a rigid material, and further preferably, the tubular base is a bent tube.

[0048] When the circular needle drives the suture to pass through the dura mater, the suture follows the circular needle through the dura mater, rotates the pull-wire driving wheel, drives the pull-wire, and then pulls the spring contraction clamp to contract and move into the tubular base, enters the tubular base, and makes the suture clamped by the spring contraction clamp also enter the tubular base, thereby automatically tightening the suture sutured on the dura mater. Then push the push rod, the pull-wire is pushed by the push rod, and the spring contraction clamp extends out of the tubular base, driving the suture to leave the tubular base, and the spring contraction clamp opens under the action of elastic force, loosens the suture, and performs the next stitch suturing operation.

[0049] By providing a wire driving wheel, the present invention can precisely adjust the moving distance of the wire, so that the suture is evenly tightened, making the cerebral dura mater sutured more evenly, which is beneficial to reducing the damage caused by uneven force when the suture passes through the dura mater.

[0050] Further, the suture mechanism further includes a rotating cover, which is fixed to the suture mechanism through a cylindrical connecting rod, such as on the outer shell of the suture mechanism. The rotating cover is buckled on the annular needle mounting module to limit the movement of the annular needle in the central axis direction;

[0051] When the rotating cover rotates around the cylindrical connecting rod, the annular needle mounting module can be exposed, so that the annular needle can be placed in the annular needle mounting module.

[0052] In the second aspect of the present invention, there is provided an application of the endoscopic cranial base dura mater suture device described in the first aspect for dura mater suture.

[0053] Advantages of the present invention:

[0054] 1. By adopting a transmission method in which a rack drives a pinion of the driving wheel and then drives a large gear of the driving wheel on the same axis, the transmission component of the present invention can effectively reduce the overall size of the suture device, facilitating the entry of the suture device from the nasal cavity into the cranial base to perform dura mater suture surgery, and having the advantage of suturing in a narrow environment. In addition, by providing a driving wheel connecting pin and a driven wheel connecting pin on the large driving wheel cover and the driven wheel cover with the same size, rotation speed, and rotation direction, and then connecting them to the connecting rod, the translational motion of the connecting rod can be realized, and the driving force on the annular needle always remains along the tangential direction, that is, the direction with the maximum effective force, thereby ensuring the reasonable reliability of the transmission, improving the smoothness of the movement of the annular needle, and enhancing the suturing effect.

[0055] 2. The present invention adopts a wire mechanism formed by a tubular base, a wire, and a wire driving wheel, which can automatically tighten the suture sutured on the cerebral dura mater through the wire mechanism after one suture, making the cerebral dura mater sutured more evenly, and being beneficial to reducing the damage caused by uneven force when the suture passes through the dura mater.

[0056] 3. By providing a handwheel structure on the thrust transmission rod that cooperates with it for transmission, the present invention can drive the entire suture mechanism and the annular needle assembly to rotate through the rotation of the handwheel, facilitating the operator to adjust the position and angle of the annular needle entering the cerebral dura mater, which is beneficial to improving the operation convenience and the accuracy of the surgery.

[0057] 4. The suture device for endoscopic cranial base dura mater provided by the present invention cooperates with the suture, enabling continuous suturing of the annular needle, avoiding the repeated entry and exit of the suture device in the nasal cavity, improving the effect and efficiency of high-difficulty surgeries, and reducing the risk of wound infection. Brief Description of the Drawings

[0058] Figure 1 The figure shows a schematic diagram of the overall structure of the stapler of the present invention;

[0059] Figure 2 The figure shows a schematic cross-sectional view of the overall structure of the stapler;

[0060] Figure 3 The figure shows a schematic diagram of the transmission mechanism;

[0061] Figure 4 The figure shows Figure 3 a reverse schematic diagram of;

[0062] Figure 5 a schematic diagram of the structure of the annular needle assembly;

[0063] Figure 6 a schematic diagram of the stitching mechanism;

[0064] Figure 7 a schematic diagram of the structure of the operating rod;

[0065] Figure 8 a schematic diagram of the structure of the handle;

[0066] Figure 9 a schematic diagram of the structure of the rotating cover;

[0067] Figure 10 a magnified schematic diagram of the structure of the handwheel;

[0068] Figure 11 a magnified view of the structure of the wire-pulling drive wheel.

[0069] The markings of the components in the figure are as follows: 101-suturing mechanism, 102-operating rod, 103-handle, 201-driven wheel upper cover, 202-connecting rod, 203-driving wheel large gear upper cover, 204-rack, 205-inner tube, 206-pull wire, 207-driving wheel connecting pin, 208-driven wheel connecting pin, 209-spring pin, 210-thrust positioning plate, 211-housing, 212-annular needle, 301-driving wheel large gear, 302-idle wheel, 303-driven wheel, 304-driven wheel shaft, 305-idle wheel shaft, 306-driving wheel small gear, 307-driving wheel Driving wheel shaft, 401-suture line, 402-thrust groove, 403-positioning groove, 501-spring contraction clamp, 502-tubular base, 601-outer tube, 701-thrust transmission rod, 702-handwheel, 703-wrench reset spring, 704-clamping end, 705-pull wire driving wheel, 706-handle shell, 707-push rod, 708-serrated structure, 709-wrench limit block, 710-limit button, 711-limit button reset spring, 712-pull end, 801-arc-shaped groove, 802-rotating cover, 901-hollow rod-shaped body, 902-bump. DETAILED DESCRIPTION

[0070] The technical scheme of the present invention is described clearly and completely below in conjunction with the embodiments and drawings. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0071] It should be noted that the words indicating directions such as "upper", "lower", "front", "back", and "backside" in the abstract, claims, and description of the application documents are relative to Figure 1 and Figure 2 In terms of.

[0072] Figures 1-11 An endoscopic skull base dura mater suture device is shown, which is mainly used to suture the dura mater and skin together through surgery. The suture device includes a suture mechanism 101, an operating rod 102 and a handle 103 connected in sequence. The suture mechanism 101 includes a housing 211, a transmission assembly and a circular needle assembly.

[0073] One end of the transmission assembly is connected to the operating rod 102, and the other end is connected to the annular needle assembly. The transmission assembly includes a driven wheel 303, a driven wheel shaft 304, an idler wheel 302, an idler wheel shaft 305, a large driving gear 301, a small driving gear 306, a driving wheel shaft 307, a rack 204, an upper cover 203 of the large driving gear, a connecting pin 207 of the driving wheel, an upper cover 201 of the driven wheel, a connecting pin 208 of the driven wheel, and a connecting rod 202. The rack 204, the small driving gear 306, the large driving gear 301, the idler wheel 302, and the driven wheel 303 are connected in sequence.

[0074] A groove (not shown in the figure) adapted to the shape of the rack 204 is formed in the housing 211 of the sewing mechanism. The rack 204 is installed in the groove, and the two are connected by a clamping action. Due to the clamping action between the rack 204 and the groove, the two can rotate synchronously. When the rack 204 rotates, it can drive the sewing mechanism 101 to rotate synchronously.

[0075] The small driving gear 306 and the large driving gear 301 are coaxially arranged. By the sliding of the rack 204, the small driving gear 306 is driven to rotate. Both the large driving gear 301 and the small driving gear 306 are fixedly connected to the driving wheel shaft 307 by threads. When the small driving gear 306 rotates, the large driving gear 301 is driven to rotate in the same direction by the driving wheel shaft 307. The driving wheel shaft 307, the idler wheel shaft 305, and the driven wheel shaft 304 are parallel to each other and perpendicular to the same straight line, and this straight line coincides with the central axis of the sewing mechanism 101.

[0076] The transmission assembly further includes an upper cover 203 of the large driving gear, a connecting pin 207 of the driving wheel, an upper cover 201 of the driven wheel, a connecting pin 208 of the driven wheel, and a connecting rod 202. The upper cover 203 of the large driving gear, the large driving gear 301, the small driving gear 306, and the driving wheel shaft 307 are fixedly connected to each other. The upper cover 201 of the driven wheel, the driven wheel 303, and the driven wheel shaft 304 are fixedly connected to each other. The large driving gear 301, the driven wheel 303, the upper cover 203 of the large driving gear, and the upper cover 201 of the driven wheel have the same size to ensure that the large driving gear 301 and the driven wheel 303 have the same rotation speed and direction during transmission. Connecting pins 207 of the driving wheel and 208 of the driven wheel are respectively arranged at the same positions on the upper cover 203 of the large driving gear and the upper cover 201 of the driven wheel. The upper cover 203 of the large driving gear and the upper cover 201 of the driven wheel are respectively connected to the connecting rod 202 through the connecting pin 207 of the driving wheel and the connecting pin 208 of the driven wheel.

[0077] When the rack 204 moves, it drives the driving pinion 306 to rotate (e.g., counterclockwise). Since the driving pinion 306 and the driving gear 301 are coaxially arranged, the driving gear 301 is driven to rotate in the same direction (e.g., counterclockwise). The driving gear 301 drives the idler gear 302 to rotate in the opposite direction (e.g., clockwise), and the idler gear 302 drives the driven gear 303 to rotate in the opposite direction (e.g., counterclockwise), realizing the same-direction rotation of the driving gear 301 and the driven gear 303. Since the driving wheel connecting pin 207 and the driven wheel connecting pin 208 are in the same position on the upper cover 203 of the driving gear and the upper cover 201 of the driven wheel, the driving wheel connecting pin 207 and the driven wheel connecting pin 208 can perform semi-circular translation in the same vertical plane, driving the connecting rod 202 to perform semi-circular translation synchronously, ensuring that the connecting rod 202 is parallel to the central axis of the sewing mechanism 101, thus realizing the smooth movement of the circular needle in the circular needle assembly.

[0078] The circular needle assembly includes a circular needle rotation and positioning module, a circular needle 212, and a circular needle mounting module.

[0079] The circular needle 212 is in a 240° arc shape. Three thrust grooves 402 are provided on one side of the circular needle 212, which are located at the positions of 30°, 120°, and 210° of the circular needle respectively. There are two positioning grooves 403 on the outside of the circular needle 212, which are located at the positions of 30° and 210° of the circular needle respectively. The positioning grooves 403 and the thrust grooves 402 are stepped on the side close to the tip of the circular needle 212 and are beveled on the side close to the tail of the circular needle 212.

[0080] The circular needle rotation and positioning module includes a spring pin 209 and a thrust positioning piece 210. One end of the spring pin 209 is fixed on the connecting rod 202, and the other end is buckled in the thrust groove 402 of the circular needle.

[0081] When the connecting rod 202 moves, the spring pin 209 can squeeze the stepped part of the thrust groove 402 to push the circular needle 212 to rotate. When the circular needle 212 is stationary, the spring pin 209 retreats along the inclined surface of the thrust groove 402, slides out of the thrust groove 402, and enters the next thrust groove 402. In this way, the circular needle 212 keeps advancing the needle.

[0082] One end of the thrust positioning piece 210 is fixed on the housing 211 of the sewing mechanism 101, and the other end is buckled in the positioning groove 403 of the circular needle 212, so that the thrust positioning piece 210 can squeeze the stepped part of the positioning groove 403 to hold the circular needle 212 and prevent the circular needle 212 from retracting the needle. When the circular needle 212 rotates, the thrust positioning piece 210 retreats along the inclined surface of the positioning groove 403 and slides out of the positioning groove 403. When the circular needle 212 is stationary, the thrust positioning piece 210 enters the next positioning groove 403 and holds the step of the positioning groove 403. In this way, the circular needle 212 keeps advancing the needle.

[0083] An arc-shaped groove 801 adapted to the annular needle 212 is provided at the front end of the annular needle mounting assembly, and the opening of the arc-shaped groove 801 faces the front of the stapler.

[0084] The operating rod 102 includes an outer tube 601 and an inner tube 205. The inner tube 205 coincides with the central axis of the outer tube 601. The inner tube 205 penetrates through the outer tube 601 and can rotate around the central axis. One end of the inner tube 205 is connected to the handle 103, and the other end of the inner tube 205 is fixedly connected to the rack 204 in the transmission assembly. The inner tube 205 is fixedly connected to the rack 204.

[0085] The handle 103 includes a wrench, a thrust transmission rod 701, a handwheel 702, a wrench return spring 703, and a handle housing 706.

[0086] The thrust transmission rod 701 includes a hollow rod-shaped body 901 and a convex block 902. One end of the hollow rod-shaped body 901 is connected to the inner tube 205 of the operating rod 102, and the other end is connected to the convex block 902.

[0087] The wrench return spring 703 is sleeved on the hollow rod-shaped body 901, and one end of the wrench return spring 703 is connected to the convex block 902 of the thrust rotating rod, and the other end is fixed inside the handle housing 706.

[0088] A hole adapted to the hollow rod-shaped body 901 is provided at the center of the handwheel 702. The handwheel 702 is sleeved on the hollow rod-shaped body 901. When the handwheel 702 is rotated, the hollow rod-shaped body 901 is driven to rotate synchronously, thereby driving the inner tube 205 to rotate.

[0089] When the handwheel 702 is rotated, the hollow rod-shaped body 901 is driven to rotate, thereby driving the inner tube 205 to rotate, and then driving the rack 204 to rotate. Since the rack 204 is engaged with the groove of the housing 211 of the suture mechanism 101, the entire suture mechanism 101 and the annular needle assembly are driven to rotate, and the position and angle of the annular needle 212 entering the dura mater can be adjusted, improving the accuracy of the operation.

[0090] The wrench includes a clamping end 704 and a lever end 712. The clamping end 704 is snap-connected to the inner tube 205 behind the convex block 902.

[0091] The handle 103 further includes a wrench limit block 709, a limit button 710, a limit button return spring 711, and a serrated structure 708. The serrated structure 708 is provided in the middle of the wrench and is integrally formed with the wrench.

[0092] The limit button 710 is in a "T" shape. One end of it can engage with the sawtooth structure 708, and the other end is connected to one end of the limit button return spring 711. The middle part of the limit button 710 is fixed on the handle housing 706 through a shaft, and the handle end of the limit button 710 can rotate around the shaft. The other end of the limit button return spring 711 is fixed on the handle housing 706.

[0093] A wrench limit block 709 is arranged inside the handle housing 706, which is used to limit the handle end of the limit button 710.

[0094] When the actuating end 712 of the wrench is pulled, the clamping end 704 of the wrench pushes the thrust transmission rod 701 and compresses the wrench return spring 703, thereby pushing the inner tube 205 to move towards the suture mechanism 101, driving the rack 204 connected to the inner tube 205 to advance, pushing the driving wheel pinion 306 to rotate (such as rotating counterclockwise), and then successively driving the driving wheel large gear 301, the idler gear 302 and the driven wheel 303 to rotate, causing the connecting rod 202 to move, thereby driving the spring pin 209 to move, and then pushing the annular needle 212 to penetrate the needle through the spring pin 209 for suture operation.

[0095] When the wrench is pulled, the sawtooth structure 708 of the wrench engages with one end of the limit button 710, and the limit button 710 rotates counterclockwise around the fixed shaft and gradually approaches the wrench limit block 709 inside the handle housing 706. When it continues to move until the wrench limit block 709 catches the limit button 710, the wrench stops moving, and the thrust transmission rod 701, the inner tube 205, the rack 204, the driving wheel pinion 306, the driving wheel large gear 301, the idler gear 302, the driven wheel 303, the connecting rod 202, and the spring pin 209 are all in a static state. At this time, the spring pin 209 contacts the step of the thrust groove 402 of the annular needle 212 and cannot push the annular needle to rotate.

[0096] When the engagement of the wrench limit block 709 with the limit button 710 is released, the sawtooth structure 708 of the wrench no longer engages with the limit button 710, the limit button return spring 711 gradually returns to its original position, pulling the limit button 710 to rotate clockwise. At the same time, the actuating end 712 of the wrench is released, the wrench return spring 703 returns to its original position, and the actuating end 712 of the wrench gradually returns to its original position, driving the thrust transmission rod 701 and the clamping end 704 of the wrench to retreat, and driving the inner tube 205 and the rack 204 to retreat. The driving wheel pinion 306 rotates in the reverse direction (clockwise), driving the driving wheel large gear 301, the idler gear 302 and the driven wheel 303 to rotate in the reverse direction (clockwise), and the connecting rod 202 moves simultaneously. The thrust positioning piece 210 can squeeze the step part of the positioning groove 403 to hold the annular needle 212 against retreating. The spring pin 209 slides out of the thrust groove 402 along the inclined surface of the thrust groove 402 of the annular needle 212, completing one actuation operation of the wrench.

[0097] The stapler further includes a wire pulling mechanism. The wire pulling mechanism includes a tubular base 502, a wire 206, and a wire driving wheel 705. One end of the wire 206 is a spring contraction clip 501, which is located at the tail of the annular needle 212 and is used to clamp and pull the suture 401 through the dura mater when the annular needle 212 sutures; the other end is a "T"-shaped push rod 707, which sequentially passes through the tubular base 502, the inner tube 205, and the hollow rod-shaped body 901. The wire driving wheel 705 is fixed inside the handle housing 706. A flexible wire (not shown in the figure) connected to the wire 206 is provided at any position of the inner tube 205 of the operating rod 102, and the other end of the flexible wire is connected to the wire driving wheel 705. The wire driving wheel 705 drives the wire 206 to move through the flexible wire.

[0098] The tubular base 502 is connected to the inner tube 205 of the operating rod 102. The tubular base 502 is made of a rigid material and has a bent tube structure.

[0099] After the annular needle 212 drives the suture 401 through the dura mater, the suture follows the annular needle 212 through the dura mater. Rotate the wire driving wheel 705 to drive the wire 206, and then pull the spring contraction clip 501 to contract and move into the tubular base 502. The suture 401 clamped by the spring contraction clip 501 also enters the tubular base 502, thereby automatically tightening the suture 401 sutured to the dura mater. Subsequently, push the push rod 707. The wire 206 is pushed by the push rod 707, so that the spring contraction clip 501 extends out of the tubular base 502, driving the suture 401 to leave the tubular base 502. The spring contraction clip 501 opens under the action of elastic force, releasing the suture 401 for the next suture operation.

[0100] The suture mechanism 101 further includes a rotating cover 802. The rotating cover 802 is fixed on the outer surface of the suture mechanism 101 through a cylindrical connecting rod. The rotating cover 802 is buckled on the annular needle mounting assembly to limit the movement of the annular needle 212 in the central axis direction. When the rotating cover 802 rotates around the cylindrical connecting rod as an axis, the arc-shaped groove 801 in the annular needle mounting assembly can be exposed, so that the annular needle can be placed in the arc-shaped groove 801.

[0101] To better understand the technical solution of the present invention, the following describes the usage method of the endoscopic skull base dura mater stapler.

[0102] 1. Rotate the rotating cover upward and to the right to expose the arc-shaped groove in the annular needle mounting and positioning assembly, and place the annular needle with the suture in the arc-shaped groove. The rotating cover is reset to fix the annular needle.

[0103] II. With the assistance of an endoscope, the stapler is inserted through the nasal cavity into the cranial base and approaches the dura mater. Rotate the handwheel, which drives the rotation of the hollow rod-shaped body, thereby driving the rotation of the inner tube, then driving the rotation of the rack, and further driving the rotation of the entire suturing mechanism and the annular needle assembly to adjust the position and angle of the annular needle. Subsequently, pull the wrench, which pushes the thrust transmission rod and compresses the wrench return spring, thereby pushing the inner tube in the operating rod towards the suturing mechanism and driving the rack forward. The rack drives the pinion of the driving wheel to rotate counterclockwise, the pinion of the driving wheel drives the large gear of the driving wheel to rotate counterclockwise, the large gear of the driving wheel drives the idler wheel to rotate clockwise, the idler wheel drives the driven wheel to rotate counterclockwise, driving the connecting rod to move, and the connecting rod drives the spring pin to squeeze the thrust groove of the annular needle, pushing the annular needle to rotate counterclockwise, and the annular needle advances, driving the suture to pass through the dura mater; when pulling the wrench, the serrated structure of the wrench meshes with one end of the limit button, and the other end rotates counterclockwise around the fixed shaft and engages with the wrench limit block.

[0104] III. Release the engagement of the wrench limit block on the limit button, loosen the wrench, and under the action of the wrench return spring, the wrench resets, driving the inner tube and the rack to retreat. Subsequently, drive the pinion of the driving wheel to rotate clockwise, the large gear of the driving wheel to rotate clockwise, the idler wheel to rotate counterclockwise, the driven wheel to rotate clockwise, and the connecting rod moves simultaneously. The thrust positioning piece can squeeze the stepped part of the positioning groove to hold the annular needle and prevent the annular needle from retracting. The spring pin slides out of the thrust groove along the inclined surface of the thrust groove, completing one operation of pulling the wrench.

[0105] IV. Rotate the wire driving wheel to pull the wire, causing the spring contraction clamp of the wire pulling mechanism to clamp the suture and pull the suture to evenly fix the dura mater and the skin. Push the push rod to release the suture by the spring contraction clamp of the wire pulling mechanism and select the needle insertion position for the next stitch; repeat the action of the wrench to continuously push the annular needle to advance, driving the suture to pass through the dura mater and the skin and stitching the two together until the operation is completed.

[0106] The above are only embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformation made using the content of the specification of the present invention, directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An endoscopic skull base dura mater suturing device, comprising a suturing mechanism, an operating rod and a handle connected in sequence; characterized in that: The suturing mechanism comprises a housing, a transmission assembly, and an annular needle assembly; one end of the transmission assembly is connected to the operating rod, and the other end is connected to the annular needle assembly; The transmission assembly comprises a rack, a driving wheel pinion, a driving wheel gear, an idler wheel and a driven wheel connected in sequence, wherein the driving wheel pinion is coaxially arranged with the driving wheel gear; The transmission assembly also includes a driving wheel gear upper cover, a driving wheel connecting pin, a driven wheel upper cover, a driven wheel connecting pin and a connecting rod; The annular needle assembly comprises an annular needle rotation positioning module, an annular needle and an annular needle installation module; The annular needle rotation positioning module comprises a spring pin and a thrust positioning plate, one end of the spring pin is fixed on the connecting rod of the transmission assembly, and the other end is buckled in the thrust groove of the annular needle; The operating rod comprises an outer tube and an inner tube, the inner tube coincides with the central axis of the outer tube, the inner tube passes through the outer tube and can rotate around the central axis, one end of the inner tube is connected to the handle, and the other end of the inner tube is connected to the rack in the transmission assembly; A groove matching the shape of the rack is provided in the shell, the rack is installed in the groove, and the rack is connected with the groove by snapping.

2. The endoscopic skull base dura mater suture device according to claim 1, characterized in that: The driving wheel gear, the driven wheel, the driving wheel gear upper cover and the driven wheel upper cover have the same size, the driving wheel connecting pin and the driven wheel connecting pin are respectively arranged at the same position of the driving wheel gear upper cover and the driven wheel upper cover, and the driving wheel gear upper cover and the driven wheel upper cover are respectively connected to the connecting rod through the driving wheel connecting pin and the driven wheel connecting pin.

3. The endoscopic skull base dura mater stapler according to claim 1, characterized in that: A plurality of positioning grooves are arranged on the outer side of the annular needle, and the positioning grooves are evenly arranged on the annular needle. A plurality of thrust grooves are arranged on the lower side of the annular needle, and the thrust grooves are evenly arranged on the annular needle. The positioning grooves and the thrust grooves are in a step shape near the needle tip and in a slope shape near the needle tail.

4. The endoscopic skull base dura mater stapler according to claim 1, characterized in that: One end of the thrust positioning sheet is fixed on the housing of the suturing mechanism, and the other end is buckled in the positioning groove of the annular needle.

5. The endoscopic skull base dura mater stapler according to claim 1, characterized in that: The annular needle mounting module is arranged at the front end of the suturing mechanism. The front end of the annular needle mounting module is provided with an arc-shaped groove adapted to the annular needle for mounting the annular needle, and the opening of the groove faces the front of the suturing device.

6. The endoscopic skull base dura mater stapler according to any one of claims 1 to 5, characterized in that: The handle comprises a wrench, a hand wheel, a thrust transmission rod, a wrench reset spring and a handle housing.

7. The endoscopic skull base dura mater suture device according to claim 6, characterized in that: The thrust transmission rod includes a hollow rod-shaped body and a protrusion, one end of the hollow rod-shaped body is fixed to the handle housing, and the other end is connected to the protrusion. A hole matching the hollow rod-shaped body is opened in the center of the hand wheel, and the hand wheel is sleeved on the hollow rod-shaped body.

8. The endoscopic skull base dura mater stapler according to claim 7, characterized in that: The wrench reset spring is sleeved on the hollow rod-shaped body, one end of the wrench reset spring is connected to the protrusion, and the other end is fixedly connected to the handle shell.

9. The endoscopic skull base dura mater suture device according to claim 6, characterized in that: The wrench comprises a wrench end and a clamping end, and the clamping end is clamped and connected to the inner tube.

10. The endoscopic skull base dura mater suture device according to claim 6, characterized in that: The handle also includes a wrench limit block, a serration structure, a limit button and a limit button reset spring.

11. The endoscopic skull base dura mater stapler according to claim 10, characterized in that: The serration structure is arranged at the middle part of the wrench.

12. The endoscopic skull base dura mater suture device according to claim 10, characterized in that: The limit button is in a "T" shape, one end of which is engaged with the serrated structure, and the other end is connected to one end of the limit button reset spring. The middle part of the limit button is fixed to the handle housing through an axis, and the handle end of the limit button can rotate around the axis.

13. The endoscopic skull base dura mater stapler according to claim 10, characterized in that: The wrench limiting block is used to limit the handle end of the limiting button.

14. The endoscopic skull base dura mater suture device according to claim 10, characterized in that: The other end of the limit button reset spring is fixed on the handle housing.

15. The endoscopic skull base dura mater suture device according to claim 1, characterized in that: The stapler also includes a wire pulling mechanism.

16. The endoscopic skull base dura mater suture device according to claim 15, characterized in that: The wire pulling mechanism comprises a tubular base, a wire pulling wire and a wire pulling driving wheel.

17. The endoscopic skull base dura mater suture device according to claim 16, characterized in that: One end of the pull wire is a spring contraction clip located at the tail of the annular needle; the other end of the pull wire is a "T"-shaped push rod, and the pull wire passes through the tubular base, the operating rod and the pull wire driving wheel in sequence.

18. The endoscopic skull base dura mater stapler according to claim 16, characterized in that: The wire-pulling driving wheel is fixed in the handle housing.

19. The endoscopic skull base dura mater suture device according to claim 16, characterized in that: The pull wire is an elastic steel wire. A soft wire connected to the pull wire is arranged at any position of the inner tube of the operating rod, and the other end of the soft wire is connected to the pull wire driving wheel.

20. The endoscopic skull base dura mater suture device according to claim 1, characterized in that: The suturing mechanism also includes a rotating cover, which is fixed to the suturing mechanism through a cylindrical connecting rod and is buckled on the annular needle mounting module.

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