Vestibular nerve sheath tumor detacher
By designing a vestibular schwannoma stripper including a handle, a connecting rod and a "W" type cutter head, the problems of damage to the nerve strand membrane and microscopic field occlusion in the prior art are solved, and more precise and safe surgical operations are achieved, thereby improving the total tumor resection rate and neurological retention rate.
Patent Information
- Application Number
- CN202520634544.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2035-04-07
AI Technical Summary
When the existing stripper strips remove the vestibular schwannoma, the contact area between the blade head and the schwannoma is large, which can easily lead to damage to the integrity of the nerve strand membrane, which in turn damages the facial auditory nerve and facial auditory artery, resulting in permanent facial paralysis or hearing loss after surgery. At the same time, the stripper blocks the microscopic field, affecting the operator's operating accuracy and accuracy.
A vestibular schwannoma stripper is designed, including a handle, a first connecting rod, a second connecting rod and a "W" type cutter head. By optimizing the structural design, the obstruction of the microscopic field is reduced, and the design of the "W" type cutter head is avoided from damaging the nerve strand membrane with excessive stress area.
By reducing the occlusion of the microscopic field and the design of the "W" type knife head, more precise interface separation is achieved, and normal neural tissue is retained to the greatest extent, the risk of postoperative complications is reduced, the surgical time is shortened, and the total tumor resection rate and neurological retention rate are improved.
Smart Images
Figure CN222853953U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of surgical instruments, and in particular relates to a vestibular schwannoma stripper. Background Art
[0002] In neurosurgery, the dissector can be used to separate brain tissue from surrounding adhesions, thereby protecting neural structures. Vestibular schwannoma is a common intracranial tumor that originates from the neurilemmary cells and mainly affects the vestibular branches. Vestibular schwannoma resection is one of the more complex operations in the field of microneurosurgery. The best effect of subperineural resection of vestibular schwannoma is to remove the schwannoma and preserve normal neural tissue to the greatest extent, providing an anatomical basis for postoperative neurological function recovery.
[0003] However, existing dissectors have the following main defects: the contact area between the blade and the schwannoma is large, and the integrity of the perineurium is easily damaged due to excessive pulling force during operation, thereby damaging the facial acoustic nerve and facial acoustic artery, causing permanent facial paralysis or hearing loss after surgery. Conventional dissectors block the microscope surgical field, affecting the operator's operating precision and accuracy.
[0004] Therefore, there is an urgent need to develop a peeling device that can take into account both the accuracy of interface separation and the function of nerve protection. Utility Model Content
[0005] The utility model aims at the above-mentioned problems and provides a vestibular schwannoma dissector by optimizing the structural design, comprising a handle, a first connecting rod, a second connecting rod and a cutting head, wherein the two ends of the first connecting rod are fixedly connected to the handle and the second connecting rod respectively, and form an angle of 120°-135° with the two; the cutting head is arranged at the distal end of the second connecting rod; the cutting head is "W"-shaped with three top ends and two bottom ends, the outer side of the cutting head is half-edged, and the two bottom ends are arc-shaped; the angle between the cutting head and the second connecting rod is 90°.
[0006] Preferably, the three top ends of the cutter head are respectively a first top end, a middle top end and a third top end, and the middle top end is fixedly connected to the distal end of the second connecting rod.
[0007] Preferably, two ends of the first connecting rod form an angle of 135° with the handle and the second connecting rod respectively.
[0008] Preferably, the handle surface is provided with an anti-slip structure.
[0009] Preferably, the handle is a cone, and the diameter of the distal end of the cone is smaller than the diameter of the proximal end.
[0010] Preferably, the handle, the first connecting rod and the second connecting rod are integrally formed, the length of the handle is 10 cm, the length of the first connecting rod is 5 cm, and the length of the second connecting rod is 12 cm; the diameters of the first connecting rod and the second connecting rod are 2 mm.
[0011] Beneficial effects of the utility model:
[0012] The utility model reduces the obstruction of the microscope surgical field by the vestibular schwannoma dissector through the angle design of the handle, the first connecting rod, the second connecting rod and the blade head; the "W"-shaped blade head avoids damage to the perineurium due to excessive force area, can preserve normal nerve tissue to the greatest extent, avoids the occurrence of various postoperative complications, is easy to use, and is conducive to reducing the operation time, thereby reducing the patient's pain.
[0013] In summary, the vestibular schwannoma dissector of the utility model achieves safer and more efficient surgical operations through structural optimization, and significantly improves the complete tumor resection rate and nerve function retention rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0015] Figure 2 It is a schematic diagram of the structure of the cutter head of the utility model, wherein the outer side of the cutter head, i.e. the thickened line part, is half-edged.
[0016] Markings in the figure: 1 is a handle; 2 is a first connecting rod; 3 is a second connecting rod; 4 is a cutter head; α is an angle between the first connecting rod and the handle, and an angle between the first connecting rod and the second connecting rod. DETAILED DESCRIPTION
[0017] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.
[0018] Combination Figure 1As shown, a vestibular schwannoma stripper includes a handle 1, a first connecting rod 2, a second connecting rod 3 and a blade 4. The two ends of the first connecting rod 2 are fixedly connected to the handle 1 and the second connecting rod 3, respectively, and form an angle α with the two, α is 120°-135°, preferably 135°; it can be seen from the figure that when the handle 1 is in a cone shape, the center line of the first connecting rod 2 forms an angle of 120°-135° with the center line of the handle 1 and the center line of the second connecting rod 3, and the center line of the handle 1 and the center line of the second connecting rod 3 are parallel; the angle of 120°-135° avoids the operator's hand blocking the field of vision. The first connecting rod 2 and the second connecting rod 3 are slender straight rod structures, which are used to accurately transmit the operating force to the blade 4.
[0019] The cutter head 4 is arranged at the distal end of the second connecting rod 3. The proximal end and the distal end described in the utility model are relative to the surgical operator; when the second connecting rod 3 is placed horizontally, the cutter head 4 is a "W" shape with three top ends and two bottom ends. The outer side of the cutter head 4 is half-edged, and the blade is smooth, and the two bottom ends are arc-shaped. The half-edged blade described in this application means that the cutter head 4 has a certain cutting ability, but is not as sharp as a full-edged blade. The cutter head of the prior art is round and flat, and the contact area with the schwannoma is large. The cutter head 4 of the utility model is hollow in the middle, with a small contact surface and a small force area.
[0020] Specifically, the plane where the cutter head 4 is located and the plane where the second connecting rod 3 is located form an angle of 90° in space.
[0021] Specifically, the three top ends of the blade head 4 are respectively the first top end, the middle top end and the third top end, and the middle top end is fixedly connected to the distal end of the second connecting rod 3. The size of the blade head 4 is 0.5 cm from the first top end to the second top end, and the vertical distance from the top end to the bottom end of the blade head 4 is 0.5 cm. Vestibular schwannoma is located in the cerebellopontine angle area, and the size of the blade head 4 is adapted to the narrow space in the cerebellopontine angle area.
[0022] The surface of the handle 1 is provided with an anti-slip structure. Specifically, the anti-slip structure can be a dot-shaped protrusion structure or a spiral-shaped protrusion structure. The handle 1 is a cone-shaped structure, and the distal diameter of the cone is smaller than the proximal diameter. The distal diameter of the cone is 8 mm, and the proximal diameter of the cone is 12 mm. The structural design of the handle 1 is ergonomic, which enhances the operator's grip stability and avoids operating errors due to operator hand fatigue.
[0023] Both bottom ends are rounded to ensure smooth sliding without piercing tissue during separation.
[0024] Specifically, the handle 1, the first connecting rod 2, and the second connecting rod 3 are integrally formed and made of medical stainless steel or titanium alloy. The length of the handle 1 is 10 cm, the length of the first connecting rod 2 is 5 cm, and the length of the second connecting rod 3 is 12 cm; the diameters of the first connecting rod 2 and the second connecting rod 3 are 2 mm respectively.
[0025] When removing an intracranial vestibular schwannoma, the utility model is used to separate the interface between the tumor and the perineurium by pushing and pulling in the vertical direction of the perineurium. Because the middle of the "W"-shaped blade is hollow, the contact area with the tumor and the perineurium is appropriately reduced, avoiding the situation where the operator applies a large force that causes the tumor as a whole to be subjected to a large pulling force. Since the blade 4 has a small force-bearing area and the bottom of the "W" shape, i.e., the two bottom ends, are arc-shaped, intraoperative perineurium tearing can be avoided to the greatest extent, thereby protecting the facial and auditory nerve function below and reducing the risk of permanent facial paralysis or hearing loss after surgery. The precise stripping design reduces the need for repeated operations and makes the separation of the tumor and the perineurium more efficient, thereby shortening the overall operation time and reducing the patient's intraoperative bleeding and infection risks.
[0026] The vestibular schwannoma stripper of the utility model realizes safer and more efficient surgical operation through structural optimization, and significantly improves the complete tumor resection rate and the nerve function retention rate.
[0027] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.
Claims
1. A vestibular schwannoma stripper, characterized in that: The invention comprises a handle (1), a first connecting rod (2), a second connecting rod (3) and a blade head (4), wherein the two ends of the first connecting rod (2) are respectively fixedly connected to the handle (1) and the second connecting rod (3), and form an angle of 120°-135° with the two. The blade head (4) is arranged at the far end of the second connecting rod (3). The blade head (4) is "W"-shaped with three top ends and two bottom ends, the two bottom ends are in arc shape, and the outer side of the blade head (4) is half-edged. The blade head (4) forms an angle of 90° with the second connecting rod (3).
2. A vestibular schwannoma stripper according to claim 1, characterized in that: The three top ends of the cutter head (4) are respectively a first top end, a middle top end and a third top end, and the middle top end is fixedly connected to the distal end of the second connecting rod (3).
3. A vestibular schwannoma stripper according to claim 1, characterized in that: The two ends of the first connecting rod (2) respectively form an angle of 135° with the handle (1) and the second connecting rod (3).
4. The vestibular schwannoma stripper according to claim 1, characterized in that: The surface of the handle (1) is provided with an anti-slip structure.
5. The vestibular schwannoma stripper according to claim 1, characterized in that: The handle (1) is a cone, and the diameter of the distal end of the cone is smaller than the diameter of the proximal end.
6. The vestibular schwannoma stripper according to claim 1, characterized in that: The handle (1), the first connecting rod (2) and the second connecting rod (3) are integrally formed; the length of the handle (1) is 10 cm, the length of the first connecting rod (2) is 5 cm, and the length of the second connecting rod (3) is 12 cm; the diameters of the first connecting rod (2) and the second connecting rod (3) are 2 mm.