Endoscopic needle-holding and suturing device for skull base dura mater

Abstract

The utility model discloses a special needle holding and suturing instrument for endoscope skull base dura, including handle, clamping rod and clamping mouth, the handle includes spanner, transmission mechanism and shell, the transmission mechanism in handle includes gear combination, three -jaw shift block and hollow block, three -jaw shift block's rear end fixed connection gear combination, and hollow block is covered in three -jaw shift block's front end. Gear combination includes hand wheel, first bevel gear and second bevel gear. When hand wheel rotates, in turn drive first bevel gear, second bevel gear, three -jaw shift block, hollow block, clamping rod and clamping mouth rotate, and further adjust the rotation angle of clamping mouth. The utility model discloses through transmission mechanism and endoscope intercoordination, adjust the needle -entering angle of annular suture needle, realized the suture of skull base dura in the narrow space, improved the precision of operation.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a needle-holding and suturing device for endoscopic skull base dura mater. Background Technology

[0002] Neuroendoscopic surgery has long been an important surgical procedure in skull base surgery, allowing for the ideal surgical removal of tumors in the skull base region via a transnasal endoscopic approach. Neuroendoscopic surgery offers significant advantages: a close surgical field, mild postoperative reactions, minimal neurological damage, and rapid postoperative recovery.

[0003] Successful anterior skull base surgery requires meticulous suturing of the dura mater to prevent postoperative cerebrospinal fluid leakage. This aims to create a crucial barrier between the cranial cavity and the extracranial space, and between the sinuses and nasal cavity, reducing the risk of complications such as intracranial infection and meningitis. Currently, standard instruments for skull base repair include miniature scissors, miniature grasping forceps, and miniature electrocoagulation. These instruments exhibit significant limitations in skull base repair: 1) The basic instruments and materials only meet the basic requirements of surgical suturing. 2) Multiple instruments are required in combination, which conflicts with the confined operating environment under endoscopy. For example, the needle holder disclosed in prior art CN216417247U, suitable for confined spaces, makes it difficult to easily rotate the needle holder. While CN213249398U allows for needle holder rotation, the overall size of the needle holder is too large, hindering operation and making it difficult to hold circular suture needles. Utility Model Content

[0004] In order to solve the above-mentioned technical problems and to more conveniently realize the clamping operations such as movement and rotation of the circular suture needle for anterior skull base surgery, this utility model provides the following technical solution.

[0005] In one aspect, this utility model provides a needle-holding suture instrument for endoscopic skull base dura mater, including a handle, a clamping rod, and a clamping nozzle.

[0006] Furthermore, the handle includes a wrench, a transmission mechanism, and a housing. The transmission mechanism includes a gear assembly, a three-jaw chuck, and a hollow block. The rear end of the three-jaw chuck is fixedly connected to the gear assembly, and the hollow block is fitted onto the front end of the three-jaw chuck.

[0007] Furthermore, the three-claw lever includes three vertical bars at the front end, a connecting block in the middle, and a rotating shaft at the rear end.

[0008] Furthermore, the three vertical bars, the connecting block, and the rotating shaft are fixedly connected or integrally formed.

[0009] Furthermore, the hollow block includes annular bosses at both ends and an annular column in the middle.

[0010] Furthermore, the hollow block has a T-shaped hollow groove at its center, and the three vertical bars at the front end of the three-jaw lever can be inserted into the three outer ends of the T-shaped hollow groove, so that the hollow block fits onto the three vertical bars and can slide along the three vertical bars.

[0011] Furthermore, the gear assembly includes a handwheel, a first bevel gear, and a second bevel gear. The handwheel is coaxially and fixedly connected to the first bevel gear, and the first bevel gear meshes perpendicularly with the second bevel gear.

[0012] Furthermore, the rotating shaft at the rear end of the three-jaw chuck is adapted to the shaft hole of the second bevel gear, and the rotating shaft is fixedly connected to the second bevel gear.

[0013] Furthermore, the diameter of the handwheel is larger than the diameter of the first bevel gear, and the diameter of the first bevel gear is smaller than the diameter of the second bevel gear. This structural design allows for the rotation of the entire suture instrument with relatively small force, and also enables more precise rotation of the clamping jaws.

[0014] Furthermore, the aforementioned fixed connections include welding, bonding, or threaded connections.

[0015] Furthermore, the clamping rod includes a moving rod and a positioning rod.

[0016] Furthermore, one end of both the moving rod and the positioning rod is inserted into the middle of the "T" shape of the hollow groove, and the moving rod is connected to the hollow block by a pin, while the positioning rod is connected to the three-jaw lever by a pin.

[0017] Furthermore, the clamping mouth includes an upper clamping block.

[0018] Furthermore, the upper clamping block is connected to the moving rod via a first pin and to the positioning rod via a second pin; the upper clamping block and the other end of the positioning rod form a clamping surface.

[0019] Furthermore, the clamping surface of the jaw is offset from the axis of the three-jaw lever.

[0020] Furthermore, the distance off the axis, i.e. the radius of rotation of the clamping surface, is the radius of the circular suture needle used in actual operation.

[0021] When it is necessary to clamp circular suture needles of different sizes, different specifications of moving rods and fixing rods can be replaced to ensure that the distance off the axis is equal to the radius of the circular suture needle used, so as to meet different clinical suturing needs.

[0022] By designing the clamping surface of the jaw to be offset from the axis of the three-jaw chuck, when the position of the clamped circular suture needle needs to be adjusted after a suture is completed, simply turn the handwheel in the opposite direction to rotate the jaw. Since the rotation radius of the clamping surface is equal to the radius of the circular suture needle, the jaw will continue to rotate along the circular suture needle, thus realizing the movement of the clamping position. There is no need to search for the clamping position in a confined space using an endoscope, which greatly reduces the difficulty of operation and improves the suture efficiency.

[0023] Furthermore, the wrench includes an actuating end and a clamping end, the wrench is connected to the housing of the handle by a pin, and the clamping end is engaged with the annular post.

[0024] Furthermore, the handle also includes a wrench return spring. One end of the wrench return spring is fixed to the annular boss, and the other end is fixed to the connecting block.

[0025] Furthermore, the number of the wrench reset springs is two or more, and they are evenly distributed on the connecting block.

[0026] When the handwheel is turned, the first bevel gear, the second bevel gear, the three-jaw chuck, the hollow block, the clamping rod, and the jaws are rotated in sequence.

[0027] When the suturing instrument is not in use, the upper clamp of the jaw is in a closed, non-clamped state.

[0028] When using the suture instrument, first open the lever end of the wrench, causing the clamping end to move the hollow block horizontally to the right, thereby moving the moving rod to the right and opening the upper clamping block of the jaw. At this time, the wrench return spring is in a compressed state. Then, tighten the lever end of the wrench. The clamping end then moves the hollow block horizontally to the left, thereby moving the moving rod to the left and clamping the upper clamping block of the jaw to hold the circular suture needle. The wrench return spring is in a stretched state, allowing for suturing operations. When the lever end is released, the wrench return spring returns to its original position, moving the hollow block horizontally to the right, thereby moving the moving rod to the right and returning the upper clamping block of the jaw to its closed, unclamped state.

[0029] The beneficial effects of this utility model are:

[0030] I. This utility model uses a transmission mechanism composed of a handwheel, a first bevel gear, a second bevel gear, a hollow block, and a three-jaw lever to adjust the rotation angle of the clamping nozzle. It has the advantages of simple structure, convenient one-handed operation, and stable operation. The gear combination and transmission mechanism work together with the endoscope to adjust the insertion angle of the circular suture needle, which meets the suturing accuracy requirements of the skull base dura mater in a confined space.

[0031] Second, in this invention, the clamping surface of the jaw is offset from the axis of the three-jaw chuck, and the distance of offset from the axis is the radius of the circular suture needle. When it is necessary to adjust the relative position of the jaw and the suture needle during needle insertion, this design makes it easy for the jaw to loosen and then clamp the suture needle again. Simply turning the handwheel ensures that the jaw rotates along the circular needle insertion trajectory of the circular suture needle, eliminating the need to search for the clamping position in a confined space using an endoscope. This greatly reduces the difficulty of operation and improves suturing efficiency. Attached Figure Description

[0032] Figure 1 The diagram shows the overall structure of an endoscopic skull base dura mater needle-holding and suturing instrument.

[0033] Figure 2 The diagram shows the internal structure of the handle of an endoscopic skull base dural needle holder for suturing.

[0034] Figure 3 The image shown is a detailed view of the gear assembly of an endoscopic skull base dural suture instrument.

[0035] Figure 4 The diagram shown is of the three-claw lever structure.

[0036] Figure 5 The diagram shown is of a hollow block structure.

[0037] Figure 6 The diagram shows the connection between the clamping rod and the clamping nozzle.

[0038] Figure 7 The diagram shown is a structural diagram of a wrench;

[0039] Figure 8 The diagram shown is a combined cross-sectional view of the three-grip lever, hollow block, and clamping rod.

[0040] Figure 9 The diagram shown is a structural diagram of the upper clamping block.

[0041] The components in the diagram are labeled as follows: 101-Handle, 102-Clamping rod, 103-Grip mouth, 201-Wrench, 202-Outer shell, 203-Gear assembly, 204-Three-jaw lever, 205-Hollow block, 206-Wrench return spring, 301-Handwheel, 302-First bevel gear, 303-Second bevel gear, 401-Vertical bar, 402-Connecting block, 403-Rotating shaft, 501-Annular boss, 502-Annular column, 503-Hollow groove, 601-Moving rod, 602-Positioning rod, 603-Upper clamping block, 701-Actuating end, 702-Clamping end. Detailed Implementation

[0042] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings. The advantages and features of this utility model will become clearer as the description unfolds. However, it should be understood that the embodiments are merely exemplary and do not constitute a limitation on the scope of this utility model.

[0043] It should be noted that the use of "first" and "second" in the abstract, claims, and description of the application documents is merely for distinguishing similar objects and should not be interpreted as a specific order or sequence.

[0044] In addition, terms indicating location such as "above," "below," "front," and "back" in the specification, claims, and abstract are all relative to... Figure 1 In other words.

[0045] Figures 1-9 An endoscopic skull base dural needle-holding suture instrument is shown, which includes a handle 101, a clamping rod 102 and a clamping mouth 103; the handle 101 includes a wrench 201, a transmission mechanism and a housing 202.

[0046] The transmission mechanism includes a gear assembly 203, a three-jaw lever 204, and a hollow block 205. The gear assembly 203 includes a handwheel 301, a first bevel gear 302, and a second bevel gear 303. The three-jaw lever 204 includes three vertical bars 401 at the front end, a connecting block 402 in the middle, and a rotating shaft 403 at the rear end. To increase the stability of the transmission mechanism, the three vertical bars 401, the connecting block 402, and the rotating shaft 403 are fixedly connected (e.g., welded, glued, or threaded) or integrally formed, preferably integrally formed.

[0047] The hollow block 205 includes annular bosses 501 at both ends and annular post 502 in the middle. A T-shaped hollow groove 503 is provided in the center of the hollow block 205. The handwheel 301 is coaxially and fixedly connected to the first bevel gear 302, and the first bevel gear 302 meshes perpendicularly with the second bevel gear 303. The rotating shaft 403 at the rear end of the three-jaw chuck 204 is adapted to the shaft hole of the second bevel gear 303, and the rotating shaft 403 is fixedly connected to the second bevel gear 303 (e.g., by welding, bonding, or threaded connection). The three vertical bars 401 at the front end of the three-jaw chuck 204 can be inserted into the three outer ends of the T-shaped hollow groove 503, allowing the hollow block 205 to fit onto the vertical bars 401 and slide along the three vertical bars 401.

[0048] The handle 101 also includes a wrench return spring 206. One end of the wrench return spring 206 is fixed to the annular boss 501 of the hollow block 205, and the other end is fixed to the connecting block 402 of the three-jaw lever 204. In this embodiment, there are three wrench return springs, evenly distributed on the connecting block 402. The wrench 201 includes an actuating end 701 and a clamping end 702. The wrench 201 is connected to the outer shell 202 of the handle 101 by a pin, and the clamping end 702 is engaged with the annular post 502.

[0049] The clamping rod 102 includes a moving rod 601 and a positioning rod 602. The rear ends of both the moving rod 601 and the positioning rod 602 are inserted into the middle of the "T" shape of the hollow groove 503. The moving rod 601 is connected to the hollow block 205 by a pin, and the positioning rod 602 is connected to the three-jaw lever 204 by a pin.

[0050] The clamping jaw 103 includes an upper clamping block 603; the upper clamping block 603 is connected to a moving rod 601 via a first pin and to a positioning rod 602 via a second pin, and the upper clamping block 603 and the front end of the positioning rod 602 form a clamping surface. The clamping jaw 103 is used to clamp a circular suture needle. The clamping surface of the clamping jaw 103 is offset from the axis of the three-jaw lever 204, and the offset distance (the rotation radius of the clamping surface) is the radius of the circular suture needle (e.g., 5 mm).

[0051] When the suturing instrument is not in use, the wrench return spring 206 is in the natural state, and the upper clamping block of the jaw is in the closed, non-clamping state.

[0052] To better understand the technical solution of this utility model, the following describes the usage of the endoscopic skull base dura mater needle-holding and suturing instrument.

[0053] 1. When using suture instruments, first open the lever end of the wrench so that the clamping end of the wrench moves the hollow block horizontally to the right, thereby moving the moving rod to the right and opening the upper clamping block of the jaw. At this time, the wrench return spring is in a compressed state. Then, tighten the lever end of the wrench. The clamping end moves the hollow block horizontally to the left, thereby moving the moving rod to the left and clamping the upper clamping block of the jaw to hold the circular suture needle. The wrench return spring is in a stretched state, and suture operations can be performed.

[0054] 2. Under endoscopic guidance, insert the clamping rod, clamping nozzle, and circular suture needle into the nasal cavity, reaching the dura mater at the base of the skull to be sutured. Gently turn the handwheel with your thumb to rotate the first bevel gear, the second bevel gear, the three-jaw lever, and the hollow block. This will rotate the positioning and moving rods of the clamping rod, as well as the clamping nozzle, to adjust the insertion angle and position of the circular suture needle for dura mater suturing. When the suture needle has inserted half (or 1 / 3) of the needle, the relative position of the clamping nozzle and the circular suture needle needs to be adjusted again. At this point, first open the lever end of the wrench to open the upper clamping block of the clamping nozzle. Then, turn the handwheel in the opposite direction to rotate the clamping nozzle. The clamping nozzle will rotate along the circular suture needle, moving the clamping nozzle to another position of the circular suture needle. Then, tighten the lever end of the wrench again to clamp the upper clamping block of the clamping nozzle and hold the circular suture needle, allowing for suturing to continue.

[0055] 3. After suturing is completed, remove the clamping rod, clamping mouthpiece, and circular suture needle from the nasal cavity. Then, open the lever end, compress the wrench return spring, and drive the hollow block to move to the right in the horizontal direction, thereby driving the moving rod to move to the right, so that the upper clamping block of the clamping mouthpiece opens and the circular suture needle is removed.

[0056] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A needle-holding suture instrument for endoscopic skull base dura mater, comprising a handle, a clamping rod, and a clamping mouthpiece, wherein the handle includes a wrench, a transmission mechanism, and a housing, characterized in that, The transmission mechanism includes a gear assembly, a three-jaw chuck, and a hollow block. The rear end of the three-jaw chuck is fixedly connected to the gear assembly, and the hollow block is fitted onto the front end of the three-jaw chuck.

2. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 1, characterized in that, The three-jaw lever includes three vertical bars at the front end, a connecting block in the middle, and a rotating shaft at the rear end, with the rotating shaft fixedly connected to the gear assembly.

3. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 2, characterized in that, The three vertical bars, the connecting block, and the rotating shaft are fixedly connected or integrally formed.

4. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 2, characterized in that, The hollow block includes annular bosses at both ends and annular column in the middle; The hollow block has a T-shaped hollow groove at its center, and the three vertical bars are inserted into the three outer ends of the T-shaped hollow groove so that the hollow block fits onto the three vertical bars.

5. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 2, characterized in that, The gear assembly includes a handwheel, a first bevel gear, and a second bevel gear. The handwheel is coaxially and fixedly connected to the first bevel gear. The first bevel gear meshes perpendicularly with the second bevel gear. The shaft hole of the second bevel gear is adapted to the rotating shaft at the rear end of the three-jaw chuck. The second bevel gear is fixedly connected to the rotating shaft.

6. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 5, characterized in that, The diameter of the handwheel is greater than the diameter of the first bevel gear, and the diameter of the first bevel gear is smaller than the diameter of the second bevel gear.

7. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 4, characterized in that, The clamping rod includes a moving rod and a positioning rod; One end of the moving rod and one end of the positioning rod are both inserted into the "T"-shaped middle of the hollow groove, and the moving rod is connected to the hollow block by a pin, and the positioning rod is connected to the three-jaw lever by a pin.

8. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 7, characterized in that, The clamping jaw includes an upper clamping block, which is connected to the moving rod via a first pin and to the positioning rod via a second pin. The upper clamping block and the other end of the positioning rod form a clamping surface, which is offset from the axis of the three-jaw lever.

9. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 4, characterized in that, The wrench includes an actuating end and a clamping end. The wrench is connected to the housing of the handle by a pin, and the clamping end is engaged with the annular post.

10. The endoscopic skull base dura mater needle-holding and suturing instrument according to claim 4, characterized in that, The handle also includes a wrench return spring, one end of which is fixed to the annular boss and the other end is fixed to the connecting block.

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