Ear micro-invasive cross-shaped round window membrane incision knife with depth control

Abstract

The present application relates to the technical field of otological microsurgery instruments, and discloses a cross-shaped round window membrane incision knife with depth control for otological minimally invasive surgery, which comprises a knife rod, a cross-shaped knife head is arranged at the operating end of the knife rod, a detachable depth control mechanism is arranged on the outside of the knife rod behind the cross-shaped knife head, a grip type handle assembly is arranged at the end of the knife rod away from the cross-shaped knife head, and the grip type handle assembly comprises a grip type handle, and a thimble is arranged at the end of the grip type handle close to the knife rod. In the present application, the cross-shaped symmetrical blade edge realizes multi-point stable support, effectively avoids the slippage of the knife head on the surface of the wet round window membrane, and the incision position is accurate; the sharp symmetrical cutting forms a regular cross-shaped incision, there is no disorganized tearing, the incision edge is neat, and this is beneficial to postoperative healing and electrode implantation sealing; the annular flange type depth control mark block forms physical limiting, the cutting depth is locked in a safe range, and overcutting damage to the inner ear is avoided in structure.

Description

Technical Field

[0001] This invention relates to the field of otological microsurgical instruments, and in particular to a minimally invasive otological cross-shaped circular window membrane incision knife with depth control. Background Technology

[0002] In minimally invasive otorectomy procedures such as cochlear implantation and targeted drug therapy for the inner ear, the round window membrane, as an important natural thin membrane separating the middle ear from the scala tympani of the inner ear, is crucial for establishing a surgical pathway to the inner ear and enabling electrode implantation or drug delivery. The precision of this operation directly affects the surgical outcome and the preservation of postoperative hearing function. Currently, in routine clinical practice, ordinary medical syringe needles (commonly 22G or 25G single-bevel needles) are generally used to puncture and incise the round window membrane. During the surgery, the surgeon holds the needle under a high-powered surgical microscope, relying on experience and feel to gradually puncture and open the highly elastic round window membrane with the bevel of the needle tip, thereby forming a tiny channel leading to the scala tympani, creating conditions for subsequent cochlear implant electrode insertion, inner ear drug infusion, and other procedures.

[0003] In existing techniques, a standard syringe needle is used to puncture and incise the round window membrane. This type of instrument has a single-bevel asymmetrical structure, and the needle tip is prone to lateral slippage when it contacts the elastic round window membrane, leading to incision displacement. Furthermore, it acts on the tissue in a piercing and tearing manner, resulting in irregular incision edges that easily damage the membrane tissue, hindering postoperative healing. Standard needles lack depth-limiting structures; the round window membrane is only 0.03–0.08 mm thick, beneath which lies the delicate structure of the inner ear. After the needle tip punctures the membrane, the resistance decreases sharply, making it difficult for the surgeon to control the needle depth by feel alone. This can easily lead to excessive insertion, damaging auditory neurons in the scala tympani and causing irreversible hearing loss. This procedure is highly dependent on the surgeon's experience, lacking sufficient safety and stability, and cannot meet the demands of minimally invasive precision surgery. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a depth-controlled, minimally invasive, cross-shaped circular window membrane incision tool for otology. This addresses the shortcomings of existing techniques that use ordinary syringe needles for puncturing and incising the circular window membrane. These needles have a single-bevel, asymmetrical structure, making them prone to lateral slippage upon contact with the elastic circular window membrane, leading to incision position deviation. Furthermore, the puncturing and tearing action on the tissue results in irregular incision edges, easily damaging the membrane tissue and hindering postoperative healing. Ordinary needles lack depth-limiting structures; the circular window membrane is only 0.03–0.08 mm thick, with delicate inner ear structures beneath it. After puncture, the resistance decreases sharply, making it difficult for the surgeon to control the needle depth by feel alone. This can easily lead to excessive insertion, damaging auditory neurons in the scala tympani and causing irreversible hearing loss. This procedure is highly dependent on the surgeon's experience, lacking safety and stability, and failing to meet the demands of minimally invasive, precise surgery.

[0005] To address the aforementioned problems, the present invention is implemented through the following technical solution.

[0006] A minimally invasive otological cross-shaped circular window membrane incision knife with depth control includes: a blade, a cross-shaped blade head at the operating end of the blade, a detachable depth control mechanism sleeved on the outside of the blade corresponding to the cross-shaped blade head, a gripping handle assembly at the end of the blade away from the cross-shaped blade head, the gripping handle assembly including a gripping handle, an insertion hole at the end of the gripping handle near the blade for inserting the blade, and threaded holes of matching shape at corresponding positions of the blade and the gripping handle, with fastening screws inside the threaded holes, the blade and the gripping handle forming a detachable structure through the fastening screws, a pen-like handle assembly on the side of the gripping handle assembly, and an acupressure handle assembly on the side of the pen-like handle assembly.

[0007] In one embodiment, the cross-shaped cutter head consists of two mutually perpendicular symmetrical cutting edges with a sharp cutting structure, a cutting edge angle of 30°, and a maximum outer diameter of 0.96m. The cross-shaped cutter head is used to form a regular cross-shaped cut on the surface of the circular window film and to prevent lateral slippage during operation.

[0008] In one embodiment, the detachable depth control mechanism includes a connecting ring, an internal threaded ring, an external threaded ring, a depth control marking block, and a control groove. The external threaded ring is located near the cross-shaped cutter head on the tool holder. An internal threaded ring that matches the shape of the external threaded ring is provided on the inner side of the connecting ring. The internal threaded ring and the external threaded ring are threadedly engaged.

[0009] In one embodiment, the outer wall of the connecting ring is provided with depth control marker blocks at equal intervals in a ring. The depth control marker block is a tiny annular flange, located 0.3 mm away from the tip of the cross-shaped cutter head. The depth control marker block is used to physically limit the insertion depth of the cross-shaped cutter head.

[0010] In one embodiment, the control groove is formed in an annular, equidistant shape on the outer surface of the connecting ring and is offset from the depth control mark block. The control groove is used to control the assembly and disassembly of the connecting ring.

[0011] In one embodiment, the gripping handle assembly further includes a thumb contact surface, an index finger positioning groove, and a three-finger positioning groove. The thumb contact surface is provided on one side of the outer surface of the gripping handle, and the index finger positioning groove is provided on the side of the outer surface of the gripping handle away from the thumb contact surface. The three-finger positioning groove is provided at the lower end of the gripping handle.

[0012] In one embodiment, the contact hole of the tool bar after being inserted into the gripping handle is wrapped with an anti-detachment ring, and the gripping handle mounting screw is provided with a countersunk groove.

[0013] In one embodiment, the pen-grip handle assembly includes a pen-grip handle, a second thumb contact surface, a second index finger positioning groove, and a first middle finger contact surface. The second thumb contact surface is provided on one side of the outer surface of the pen-grip handle, and the second index finger positioning groove is provided on the side of the outer surface of the pen-grip handle corresponding to the second thumb contact surface. The first middle finger contact surface is provided between the second thumb contact surface and the second index finger positioning groove on the outer surface of the pen-grip handle.

[0014] In one embodiment, the acupressure handle assembly includes an acupressure handle, an index finger positioning groove three, a thumb contact surface three, and a middle finger contact surface two. The thumb contact surface three is provided on one side of the outer surface of the acupressure handle, and the middle finger contact surface two is provided on the outer side of the acupressure handle away from the thumb contact surface three. The index finger positioning groove three is provided at the front end of the acupressure handle.

[0015] In one embodiment, the gripping handle assembly, the pen-grip handle assembly, and the finger pressure handle assembly are used for knife handle replacement. The gripping handle, the pen-grip handle, and the finger pressure handle are all provided with anti-slip knurling on the outer side where there are no finger pressure points.

[0016] This invention provides a minimally invasive, cross-shaped circular window membrane incision knife for otology with depth control. Compared with existing technologies, it has the following advantages: The cross-shaped symmetrical cutting edge provides multi-point stable support, effectively preventing the blade from slipping on the moist circular window membrane surface, ensuring accurate incision positioning. Sharp, symmetrical cutting creates a neat cross-shaped incision without tissue tearing, resulting in clean incision edges that promote postoperative healing and electrode implantation sealing. A ring-shaped flange-type depth control marker provides physical restraint, locking the cutting depth within a safe range and structurally preventing over-cutting and damage to the inner ear, reducing reliance on surgeon experience. Three interchangeable handles—grip, pen, and finger pressure—are provided to accommodate different surgeons' operating habits, while the anti-slip structure and conforming surface enhance operational stability. Both the depth control mechanism and handles utilize a quick-release structure with threads and screws, ensuring precise assembly and easy disassembly, facilitating sterilization and replacement of parts. The depth control marker provides clear optical contrast under a microscope, allowing direct visualization of the cutting endpoint and improving surgical controllability. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a depth-controlled otolaryngological minimally invasive cross-shaped circular window membrane incision knife after installing a gripping handle assembly.

[0018] Figure 2 This is a schematic diagram of the cross-shaped blade and the detachable depth control mechanism of a minimally invasive otological cross-shaped circular window membrane incision knife with depth control.

[0019] Figure 3 This is a schematic diagram of the structure of a minimally invasive otological cross-shaped circular window membrane incision knife with depth control after the cross-shaped blade is separated from the detachable depth control mechanism.

[0020] Figure 4 This is a schematic diagram of the structure of the gripper handle assembly and the blade of a minimally invasive otological cross-shaped circular window membrane incision knife with depth control after separation.

[0021] Figure 5 A minimally invasive, depth-controlled, cruciate circular window membrane incision knife for otology. Figure 4 Enlarged structural diagram at point A in the middle.

[0022] Figure 6 Schematic diagrams of the gripping handle assembly, pen-style handle assembly, and acupressure handle assembly of a depth-controlled minimally invasive otolaryngological cross-shaped circular window membrane incision knife.

[0023] Figure 7 This is a schematic diagram of the pen-style handle assembly and the finger-pressure handle assembly of a minimally invasive otological cross-shaped circular window membrane incision knife with depth control.

[0024] The attached figures are labeled as follows: 1. Tool holder; 2. Cross-shaped tool head; 3. Detachable depth control mechanism; 301. Connecting ring; 302. Internal threaded ring; 303. External threaded ring; 304. Depth control marker block; 305. Control slot; 4. Grip handle assembly; 401. Grip handle; 402. Thumb contact surface one; 403. Index finger positioning slot one; 404. Three-finger positioning slot; 5. Insertion hole; 6. Fastening screw; 7. Thread 8. Hole; 9. Anti-detachment ring; 10. Countersunk groove; 11. Pen-style handle assembly; 12. Thumb contact surface two; 13. Index finger positioning groove two; 14. Middle finger contact surface one; 15. Acupressure handle assembly; 16. Acupressure handle; 17. Index finger positioning groove three; 18. Thumb contact surface three; 19. Middle finger contact surface two; 10. Anti-slip knurling. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] Reference Figures 1-7A minimally invasive otological cross-shaped circular window membrane incision knife with depth control includes: a knife bar 1, a cross-shaped blade head 2 at the operating end of the knife bar 1, a detachable depth control mechanism 3 sleeved on the outside of the knife bar 1 corresponding to the cross-shaped blade head 2, a gripping handle assembly 4 at the end of the knife bar 1 away from the cross-shaped blade head 2, the gripping handle assembly 4 including a gripping handle 401, an insertion hole 5 at the end of the gripping handle 401 near the knife bar 1 for inserting the knife bar 1, and threaded holes 7 with matching shapes at corresponding positions of the knife bar 1 and the gripping handle 401, with fastening screws 6 inside the threaded holes 7, the knife bar 1 and the gripping handle 401 forming a detachable structure through the fastening screws 6, a pen-like handle assembly 10 on the side of the gripping handle assembly 4, and an acupressure handle assembly 11 on the side of the pen-like handle assembly 10.

[0028] The cross-shaped cutter head 2 consists of two mutually perpendicular symmetrical cutting edges with a sharp cutting structure and a cutting edge angle of 30°. The maximum outer diameter of the cross is 0.96m. The cross-shaped cutter head 2 is used to form a regular cross-shaped cut on the surface of the circular window film and to prevent lateral slippage during operation.

[0029] The detachable depth control mechanism 3 includes a connecting ring 301, an internal threaded ring 302, an external threaded ring 303, a depth control mark block 304, and a control groove 305. The external threaded ring 303 is located on the tool holder 1 near the cross-shaped tool head 2. The connecting ring 301 has an internal threaded ring 302 that matches the shape of the external threaded ring 303 on its inner side. The internal threaded ring 302 and the external threaded ring 303 are threadedly engaged.

[0030] The outer wall of the connecting ring 301 is provided with depth control mark blocks 304 at equal intervals in a ring shape. The depth control mark block 304 is a small annular flange, which is set 0.3mm away from the tip of the cross-shaped cutter head 2. The depth control mark block 304 is used to physically limit the insertion depth of the cross-shaped cutter head 2.

[0031] The control groove 305 is equidistantly arranged in a ring on the outer surface of the connecting ring 301 and is offset from the depth control mark block 304. The control groove 305 is used to control the installation and removal of the connecting ring 301.

[0032] The gripping handle assembly 4 also includes a thumb contact surface 402, an index finger positioning groove 403, and a three-finger positioning groove 404. The thumb contact surface 402 is provided on one side of the gripping handle 401, and the index finger positioning groove 403 is provided on the side of the gripping handle 401 away from the thumb contact surface 402. The three-finger positioning groove 404 is provided at the lower end of the gripping handle 401.

[0033] After the tool holder 1 is inserted into the gripping handle 401, it is wrapped with an anti-detachment ring 8 at the contact hole 5, and a countersunk groove 9 is provided at the fastening screw 6 of the gripping handle 401.

[0034] The pen-grip handle assembly 10 includes a pen-grip handle 1001, a second thumb contact surface 1002, a second index finger positioning groove 1003, and a first middle finger contact surface 1004. The second thumb contact surface 1002 is provided on one side of the outer surface of the pen-grip handle 1001, and the second index finger positioning groove 1003 is provided on the outer surface of the pen-grip handle 1001 next to the second thumb contact surface 1002. The first middle finger contact surface 1004 is provided between the second thumb contact surface 1002 and the second index finger positioning groove 1003 on the outer surface of the pen-grip handle 1001.

[0035] The acupressure handle assembly 11 includes an acupressure handle 1101, an index finger positioning groove 1102, a thumb contact surface 1103, and a middle finger contact surface 1104. The thumb contact surface 1103 is provided on one side of the acupressure handle 1101, and the middle finger contact surface 1104 is provided on the side of the acupressure handle 1101 away from the thumb contact surface 1103. The index finger positioning groove 1102 is provided at the front end of the acupressure handle 1101.

[0036] The gripping handle assembly 4, the pen-grip handle assembly 10, and the finger pressure handle assembly 11 are used for replacing the knife handle 1. The gripping handle 401, the pen-grip handle 1001, and the finger pressure handle 1101 are all provided with anti-slip knurling 12 on the outer side where there are no finger pressure points.

[0037] Example 1: A minimally invasive otological cross-shaped circular window membrane incision knife with depth control. The shank is made of medical-grade 304 stainless steel with a diameter of 0.6 mm and the surface can be coated with an insulating layer. The cross-shaped blade head 2 is formed by micro-electro-discharge or laser cutting, with two vertically symmetrical cutting edges, a cutting edge angle of 30°, and a maximum outer diameter of 0.96 mm.

[0038] The depth control marker block 304 is a polished annular flange, 0.3 mm from the tip of the cross-shaped cutter head 2, and coaxial with the cutter bar 1. Under a microscope, it presents a bright visible ring. The detachable depth control machine 3 is connected to the outer threaded ring 303 on the outside of the cutter bar 1 through the inner threaded ring 302. The outer ring of the connecting ring 301 is provided with an annular control groove 305.

[0039] The rear end of the knife bar 1 is inserted into the gripping handle 401 through the insertion hole 5 and fixed by the fastening screw 6. The connection is provided with an anti-derailment ring 8. The fastening screw 6 is hidden in the countersunk groove 9. The gripping handle 401, the pen handle 1001 and the acupressure handle 1101 are all provided with anti-slip knurling 12 on the outer side where there are no acupressure points.

[0040] Example 2: In use, the pen-type handle assembly 10 or the finger-press handle assembly 11 is inserted into the rear end of the knife bar 1 and fixed with the fastening screw 6. The rest of the structure is the same as in Embodiment 1, in order to adapt to different gripping and operation methods.

[0041] Instructions for use: Under an otoscope or microscope, align the cross-shaped blade 2 vertically with the center of the circular window membrane, press gently to advance, and the cross-shaped blade 2 will stably cut the tissue; when the depth control marker block 304 contacts the membrane surface and the resistance increases significantly, stop the needle advance to complete the standard cross-shaped incision.

[0042] Before use, depending on the surgeon's operating habits, select one of the following: a gripping handle assembly 4, a pen-grip handle assembly 10, or a finger-pressure handle assembly 11. Insert the end of the blade 1 furthest from the cross-shaped blade head 2 into the corresponding handle's insertion hole 5, aligning the blade 1 with the threaded hole 7 on the handle. Tighten the fastening screw 6 to secure it. The head of the fastening screw 6 is recessed into the countersunk groove 9 to prevent it from being exposed and affecting operation. The anti-detachment rubber ring 8 at the connection between the blade 1 and the handle is compressed and wrapped to improve the tightness of the connection and prevent loosening during use. The area of ​​the handle without finger positions has anti-slip knurling 12 to increase grip friction and ensure stable operation. During surgical operation, the surgeon... The user's fingers are positioned according to the corresponding finger positions on the handle: When using the grip-type handle assembly 4, the thumb is positioned on thumb contact surface 1 402, the index finger is placed in index finger positioning groove 1 403, and the remaining fingers are positioned in index finger positioning groove 404; when using the pen-grip handle assembly 10, the thumb is positioned on thumb contact surface 2 1002, the index finger is placed in index finger positioning groove 2 1003, and the middle finger is positioned on middle finger contact surface 1 1004; when using the acupressure handle assembly 11, the thumb is positioned on thumb contact surface 3 1103, the index finger is placed in index finger positioning groove 3 1102, and the middle finger is positioned on middle finger contact surface 2 1104, achieving stable grip and precise force application; the cross-shaped blade head 2 at the front end of the blade 1 is held vertically... Aiming directly at the center of the patient's circular window membrane, the cross-shaped blade 2, composed of two mutually perpendicular symmetrical sharp cutting edges, forms multi-point support upon contact with the membrane surface, effectively preventing lateral slippage. Continuous application of slight axial pressure causes the cross-shaped blade 2 to sharply cut the circular window membrane, forming a regular cross-shaped incision. When the preset depth is reached, the depth control marker block 304 of the detachable depth control mechanism 3 contacts the surface of the circular window membrane, forming a physical barrier to prevent the cross-shaped blade 2 from penetrating further, achieving precise limitation of the cutting depth. The depth control marker block 304 is polished, exhibiting a bright ring under a microscope, providing optical contrast with the blade holder 1 and offering the surgeon a clear visual indication. The cutting endpoint is indicated; the detachable depth control mechanism 3 is fixed in place by the internal thread ring 302 on the inner side of the connecting ring 301 and the external thread ring 303 on the blade 1. The surgeon can use tweezers or other tools to hold the control groove 305 on the outer ring of the connecting ring 301 and turn it to quickly detach and finely adjust the position of the detachable depth control mechanism 3 to meet the needs of different surgical scenarios; the entire operation process ensures a neat incision and prevents lateral slippage through the cross-shaped blade head 2, and achieves depth limit and visual prompts through the depth control marker block 304. Three interchangeable handle components meet different operating habits, ultimately achieving precise, safe and minimally invasive incision of the circular window membrane.

[0043] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A minimally invasive otological cross-shaped circular window membrane incision knife with depth control, characterized in that, include: A tool holder (1) has a cross-shaped cutting head (2) at its operating end. A detachable depth control mechanism (3) is fitted around the tool holder (1) behind the cross-shaped cutting head (2). A gripping handle assembly (4) is provided at the end of the tool holder (1) away from the cross-shaped cutting head (2). The gripping handle assembly (4) includes a gripping handle (401). An insertion hole (5) is provided at the end of the gripping handle (401) near the tool holder (1). (5) For inserting the knife bar (1), and the knife bar (1) and the gripping handle (401) are provided with threaded holes (7) of matching shape. The threaded holes (7) are provided with fastening screws (6). The knife bar (1) and the gripping handle (401) form a detachable structure through the fastening screws (6). The gripping handle assembly (4) is provided with a pen-type handle assembly (10) on the side, and the pen-type handle assembly (10) is provided with a finger-pressing handle assembly (11) on the side.

2. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 1, characterized in that, The cross-shaped cutter head (2) consists of two mutually perpendicular symmetrical cutting edges. The cutting edges are sharp cutting structures with a cutting edge angle of 30° and a maximum outer diameter of 0.96m. The cross-shaped cutter head (2) is used to form a regular cross-shaped cut on the surface of the circular window film and to prevent side slippage during operation.

3. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 1, characterized in that, The detachable depth control mechanism (3) includes a connecting ring (301), an internal threaded ring (302), an external threaded ring (303), a depth control mark block (304), and a control groove (305). The external threaded ring (303) is located on the tool holder (1) near the cross-shaped tool head (2). The connecting ring (301) has an internal threaded ring (302) that matches the shape of the external threaded ring (303) on its inner side. The internal threaded ring (302) and the external threaded ring (303) are threaded together.

4. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 3, characterized in that, The outer wall of the connecting ring (301) is provided with depth control marker blocks (304) at equal intervals in a ring. The depth control marker block (304) is a small ring flange, which is set at a distance of 0.3 mm from the tip of the cross-shaped cutter head (2). The depth control marker block (304) is used to physically limit the insertion depth of the cross-shaped cutter head (2).

5. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 4, characterized in that, The control groove (305) is formed in an annular and equidistant manner on the outer surface of the connecting ring (301) and is offset from the depth control mark block (304). The control groove (305) is used to control the assembly and disassembly of the connecting ring (301).

6. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 1, characterized in that, The gripping handle assembly (4) further includes a thumb contact surface (402), an index finger positioning groove (403), and a three-finger positioning groove (404). The gripping handle (401) has a thumb contact surface (402) on one side of its outer surface, and an index finger positioning groove (403) on the side of the gripping handle (401) away from the thumb contact surface (402). The gripping handle (401) has a three-finger positioning groove (404) at its lower end.

7. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 6, characterized in that, After the tool bar (1) is inserted into the gripping handle (401), it is wrapped with an anti-detachment ring (8) at the contact hole (5), and a countersunk groove (9) is provided at the fastening screw (6) of the gripping handle (401).

8. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 1, characterized in that, The pen-holding handle assembly (10) includes a pen-holding handle (1001), a thumb contact surface two (1002), an index finger positioning groove two (1003), and a middle finger contact surface one (1004). The pen-holding handle (1001) has a thumb contact surface two (1002) on one side of its outer surface, and the pen-holding handle (1001) has an index finger positioning groove two (1003) on the side of its outer surface corresponding to the thumb contact surface two (1002). The pen-holding handle (1001) has a middle finger contact surface one (1004) between the thumb contact surface two (1002) and the index finger positioning groove two (1003).

9. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 1, characterized in that, The acupressure handle assembly (11) includes an acupressure handle (1101), an index finger positioning groove three (1102), a thumb contact surface three (1103), and a middle finger contact surface two (1104). The thumb contact surface three (1103) is provided on one side of the acupressure handle (1101), and the middle finger contact surface two (1104) is provided on the side of the acupressure handle (1101) away from the thumb contact surface three (1103). The index finger positioning groove three (1102) is provided at the front end of the acupressure handle (1101).

10. The otological minimally invasive cross-shaped circular window membrane incision knife with depth control according to claim 9, characterized in that, The gripping handle assembly (4), the pen-holding handle assembly (10), and the finger-pressure handle assembly (11) are used for replacing the knife handle (1). The gripping handle (401), the pen-holding handle (1001), and the finger-pressure handle (1101) are all provided with anti-slip knurling (12) on the outer side where there are no finger pressure points.

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