Ultrasonic knife for cutting tissue in thin layer

Abstract

The ultrasonic knife comprises a sleeve, an amplitude-change pole, a blade, a water inlet and a water outlet, the sleeve is of a cylindrical shell-shaped structure with a notch in the side face, the amplitude-change pole, a water inlet pipe opening, a water outlet pipe opening and the blade are placed in the sleeve, the blade is connected with the amplitude-change pole, and the blade is provided with saw-toothed edges on one side or two sides. And the main body of the blade protrudes out of the side notch of the sleeve. The water outlet is used for spraying a solution to reduce the temperature of the cutter body, and the water inlet is used for generating suction negative pressure and discharging cut tissue fragments. The ultrasonic knife provided by the invention has the advantages that rapid, safe and thickness-controllable excision of thin-layer tissues is realized, and the effect of enucleating the tissues is realized; meanwhile, the device has the advantages of being good in hemostasis effect, small in heat damage, little in smoke and the like, and a new operation thought is provided for excision of hyperplasia tissues in cavities such as artery plaques, benign prostatic hyperplasia and esophageal leiomyoma. The problems that the size is too large, the thickness is uncontrollable and the efficiency is low when the thin-layer tissue in the cavity is cut are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, in particular to an ultrasonic scalpel for thin-layer tissue excision. Background Art

[0002] Thin-layer resection is a surgical procedure that precisely removes or strips superficial lesions and surrounding tissue while preserving deeper functions to the greatest extent possible. It is commonly used to remove or strip benign or localized tumors, cysts, skin and mucosal lesions, and cervical surface neoplasia. Intraluminal proliferative diseases such as arterial plaques, prostatic hyperplasia, and esophageal leiomyoma also require precise intraluminal resection of tissue of a certain thickness. Thin-layer resection requires smaller instruments and is often performed within a fluid-filled cavity.

[0003] Currently, the main surgical devices used for tissue resection include high-frequency electrosurgical scalpels, ultrasonic scalpels, lasers, and plasma. Compared with other devices, ultrasonic scalpels offer advantages such as faster resection speed, better hemostasis, minimal thermal damage, reduced smoke, and increased safety, making them widely used in soft tissue resection and amputation. Furthermore, ultrasonic scalpels have the advantage of operating in liquid environments. Therefore, ultrasonic scalpels have unique advantages for resecting tissue within fluid-filled cavities. The development of ultrasonic scalpels for thin-layer resection has important clinical significance.

[0004] Ultrasonic scalpels are broadly categorized by blade type: sharp (excellent for excision), blunt (excellent for both cutting and coagulation), and flat (excellent for coagulation). Shape also includes curved and straight blades, which perform vertical excision of tissue under clamping conditions. However, current applications for intracavitary thin-layer tissue excision still have drawbacks (such as cutting accuracy and tissue damage), resulting in suboptimal surgical outcomes.

[0005] The clamping arm structure of existing blades is too large, making it difficult to operate within cavities such as arteries. Most current ultrasonic scalpel blades use a clamping arm structure to clamp and secure tissue for resection or coagulation. However, the excessive transverse dimensions of these clamping arms make them difficult to operate within cavities such as arteries, and they are also unable to clamp hyperplastic tissue on the inner walls of the cavities.

[0006] Existing blade shapes are not suitable for thin-layer resection. Currently, ultrasonic scalpel blade tip configurations mainly include multi-purpose scissors, curved multi-purpose scissors, curved stripping blades, separation hooks, and hemostatic balls. These structures can cut or resect thick tissue, but cannot achieve thin-layer resection.

[0007] Traditional ultrasonic scalpels lack a mechanism for controlling the thickness of the resection. This relies heavily on the surgeon's experience, which can easily damage deep tissue. Precise control of the resection thickness can also damage deep, healthy tissue. Currently, ultrasonic scalpels lack a mechanism for controlling the resection thickness, relying heavily on the surgeon's experience, making precise control impossible.

[0008] It can be seen that the current ultrasonic scalpels are difficult to achieve thin-layer resection of intracavitary tissue, so there is an urgent need to develop a new ultrasonic scalpel that can achieve thin-layer resection of intracavitary tissue. Summary of the Invention

[0009] In view of this, an object of the present invention is to provide an ultrasonic scalpel for thin-layer tissue resection, wherein the device utilizes an arc-shaped blade connected to a horn 22 to perform thin-layer tissue resection.

[0010] In order to achieve the above object, the present invention provides the following technical solutions: The ultrasonic scalpel for thin-layer tissue excision provided by the present invention comprises a handle and a scalpel head arranged on the handle; the scalpel head comprises a sleeve, a horn and a blade; The amplitude variable rod is arranged on the handle and connected to the ultrasonic transducer, and the sleeve covers the blade and has a notch on the side; the blade is connected to the amplitude variable rod, and the main body of the blade protrudes from the side notch of the sleeve to form a gap to accommodate tissue and control the resection thickness; the resection side of the blade is serrated on one side or both sides; the handle is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe opening is located at the front end of the blade, and the water outlet pipe opening is located at the notch, and the negative pressure generated by the water absorption of the water outlet pipe sucks the tissue into the gap and fixes it.

[0011] Furthermore, the main body of the blade protruding from the side notch of the sleeve is configured as a curved portion 231, and a gap is formed between the curved portion and the outer wall of the sleeve, and the gap is used to accommodate tissue and control the resection thickness.

[0012] Furthermore, the sleeve and the handle are connected in a detachable manner.

[0013] Furthermore, the blade is connected to the amplitude transformer in a detachable manner.

[0014] Furthermore, the top end of the sleeve is a gradually tapering closed frustum or spherical cap structure.

[0015] Furthermore, the sleeve notch is arc-shaped or rectangular, and the notch angle θ is 20° to 180°.

[0016] Furthermore, the width of the gap is 1 to 8 mm.

[0017] Furthermore, the wedge angle of the serrated edge of the blade is 35° to 45°.

[0018] Furthermore, the outlet pipe is used to generate negative suction pressure to suck the excised tissue into the gap.

[0019] Furthermore, the gap formed between the curved portion of the blade and the outer wall of the sleeve is used to represent the height h between the plane where the main body of the blade is located and the plane where the sleeve slot is located, and the height h satisfies the following formula with the radius and the slot angle θ: h≥R-Rcos(θ / 2); wherein h represents the height of the gap between the curved portion of the blade and the outer wall of the sleeve; R represents the radius of the sleeve; and θ represents the slot angle.

[0020] The beneficial effects of the present invention are: The ultrasonic scalpel provided by the present invention for thin-layer tissue resection relates to the field of medical devices. The device comprises a cannula, a horn, a sharpened blade, and a water inlet and outlet. The cannula is a cylindrical shell structure with side notches. The horn, water inlet and outlet pipes, and the blade are placed inside. The blade is connected to the horn and has a serrated edge on one or both sides. The main body of the blade protrudes from the side notch of the cannula. The water outlet is located at the upper end of the cannula and is used to spray solution to reduce the blade body temperature. The water inlet is located in the middle of the cannula and is used to generate negative suction pressure and expel excised tissue fragments.

[0021] The ultrasonic scalpel provided by this invention offers the advantages of rapid, safe, and thickness-controlled resection of thin tissue layers, achieving the desired tissue excision effect. It also offers advantages such as excellent hemostasis, minimal thermal damage, and low smoke production. This provides a new surgical approach for the resection of intraluminal hyperplastic tissues, such as arterial plaques, prostatic hyperplasia, and esophageal leiomyoma. It addresses the issues of excessive size, uncontrollable thickness, and low efficiency when resecting thin intraluminal tissue layers.

[0022] The ultrasonic scalpel provided by this invention can control the thickness of tissue removed, enabling thin-layer resection (via gap width adjustment). This improves resection efficiency (the serrated blade reduces surgical time). It also enhances safety (the armless design reduces size, and the cannula protects the blade). It also supports intraluminal procedures (e.g., resection of arterial plaque and prostate hyperplasia).

[0023] The ultrasonic scalpel provided by the present invention can achieve thin-layer resection with controllable thickness by adjusting the height of the blade protruding from the sleeve. By adjusting the height of the arc-shaped blade protruding from the sleeve, thin-layer resection with controllable thickness can be achieved. The protruding height can be used to produce a series of ultrasonic scalpel heads with different heights according to clinical needs; by providing a serrated sharp blade, rapid resection of thin layers can be achieved. Rapid resection of tissue is achieved, resection efficiency is improved, and operation time is shortened; the safety of resection is improved by providing a sleeve. By placing the sharp blade in the sleeve, the contact range between the tissue and the blade and the resection range are reduced, and the safety during the resection process is improved; and clamping of the tissue is achieved without a clamping arm. By providing a water inlet pipe to generate suction negative pressure, a certain fixation and clamping effect is provided for tissue resection, and the ultrasonic scalpel head without a clamping arm greatly reduces the diameter of the scalpel head.

[0024] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration.

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the ultrasonic knife.

[0027] Figure 2 A three-dimensional diagram of the cutter head.

[0028] Figure 3 Top view of the cutter head.

[0029] Figure 4 This is the main view of the double-edged blade.

[0030] Figure 5 This is the main view of the single-edged cutter head.

[0031] Figure 6 This is a schematic cross-sectional view of a double-edged blade.

[0032] Figure 7 This is a schematic cross-sectional view of a single-edged cutter head.

[0033] Figure 8 This is a schematic diagram of the state of the blade removing a thin layer of tissue in the cavity.

[0034] Figure 9 Schematic diagram of the movement direction of the blade when removing a thin layer of tissue.

[0035] Figure 10It is a traditional ultrasonic scalpel with a non-bladed blade.

[0036] Figure 11 Ultrasonic scalpel with a serrated blade for thin layer removal.

[0037] Figure 12 Schematic diagram of pig yellow throat removal using a traditional ultrasonic scalpel without a sharp blade.

[0038] Figure 13 Schematic diagram of using an ultrasonic scalpel with a serrated blade to remove thin layers of pig throat.

[0039] In the figure: 1 handle, 2 blade head, 3 gap; 21 sleeve, 22 amplitude rod, 23 blade, 24 water inlet pipe, 25 water outlet pipe, 26 tissue, 27 ultrasonic transducer; 221 notch, 222 resection side, 231 bending part. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0041] like Figure 1 and Figure 2 As shown, the ultrasonic scalpel for thin-layer tissue resection provided in this embodiment includes a handle 1 and a scalpel head 2 provided on the handle 1; the scalpel head 2 includes a sleeve 21, a horn 22 and a blade 23; The horn 22 is disposed on the handle 1 and connected to the ultrasonic transducer 27. The sleeve 21 covers the blade 23 and has a notch 221 on its side. The blade 23 is connected to the amplitude rod 22, and the main body of the blade 23 protrudes from the side notch 221 of the sleeve 21. The main body of the blade 23 protruding from the side notch 221 of the sleeve 21 is set as a curved portion 231, and a gap 3 is formed between the curved portion 231 and the outer wall of the sleeve 21. The gap 3 is used to accommodate tissue 26 and control the resection thickness.

[0042] The cutting side 222 of the blade 23 is unilaterally (single-edged) or bilaterally serrated (double-edged); the handle 1 is provided with a water inlet pipe 24 and a water outlet pipe 25, the opening of the water inlet pipe 24 is located at the front end of the blade 23, and the opening of the water outlet pipe 25 is located at the notch 221, and the tissue 26 is sucked into the gap 3 and fixed by the water absorption negative pressure.

[0043] The other end of the horn 22 in this embodiment is connected to the ultrasonic transducer 27 for driving the horn 22 to vibrate, the blade 23 extends from the connection of the horn 22 to the outside of the handle 1, the sleeve 21 is provided at the blade 23 for covering the blade 23, the middle part of the blade 23 can extend out of the notch 221, and the distance that the blade 23 extends out of the outer wall of the sleeve 21 is used to accommodate the tissue 26 that needs to be removed in a thin layer; the middle part of the blade 23 is provided with a curved portion 231, and the curved portion 231 extends from the notch 221. When the ultrasonic scalpel is used in surgery, if a thin layer of tissue 26 needs to be removed, the tissue 26 can be placed between the curved portion 231 of the blade 23 and the notch 221 of the sleeve 21, and the ultrasonic transducer 27 is started to work, and the blade 23 is driven to vibrate by the horn 22, thereby removing the tissue 26 and achieving a thin layer of tissue 26 removal; The ultrasonic transducer 27 in this embodiment must meet the following requirements: frequency range: 20-60 kHz, piezoelectric ceramic (model PZT-8), output power: 50-300 W, linear amplitude controllability: 30-100 μm (via voltage adjustment 0-100 V DC), and comply with YY / T0752-2020 "Method for measuring the basic output characteristics of ultrasonic surgical equipment."

[0044] The handle 1 is provided with a water inlet pipe 24 and a water outlet pipe 25. The inlet pipe 24 has its opening located at the front end of the blade 23 for dispensing solution, while the outlet pipe 25 has its opening located at the notch 221 for generating negative suction pressure and expelling tissue 26 fragments. Water flowing from the inlet pipe 24 cleans the tissue 26 or the blade 23. Simultaneously, the negative pressure generated by the outlet pipe 25 during water absorption draws the tissue 26 to be removed into the excision gap 3 between the curved portion 231 of the blade 23 and the notch 221. The water also acts to secure the tissue 26, preventing it from escaping the excision gap 3. In this embodiment, the negative pressure generated by the outlet of the water outlet pipe 25 during water absorption is used to suck in the tissue 26 to be removed. The outlet is connected to an external negative pressure generating system, and negative pressure extraction is generated by the negative pressure generating system.

[0045] The notch 221 is opened on the side of the sleeve 21. The sleeve 21 is a cylindrical shell structure. A card slot is provided between the sleeve 21 and the handle 1. When the sleeve 21 is inserted into the card slot at the front end of the handle 1, it can be connected by the card slot buckle, or it can be connected by rotating the sleeve 21 to deflect a certain angle. The amplitude converter 22 is connected to the blade 23, and a snap-fit ​​structure can also be used to facilitate disassembly and installation. In this embodiment, the amplitude converter 22 and the blade 23 can also be connected in other ways, such as welding, threaded fixation or a snap-fit ​​structure. The connection method can ensure the vibration transmission efficiency after assembly and avoid causing the blade 23 to fall off or malfunction.

[0046] like Figure 3 As shown, the cutting side 222 of the blade 23 is provided with a cutting edge, and the cutting edge is used to quickly cut the tissue 26; The cutting side 222 of the blade 23 is provided with serrations, which are used to quickly cut the tissue 26; The sleeve 21 can protect the blade 23, preventing the blade 23 from leaking out and injuring people, or preventing the blade 23 from cutting off too much tissue 26; like Figure 6 and Figure 7 As shown, the top end of the sleeve 21 away from the handle 1 is configured to be a gradually tapering end, which may be a closed frustum or a spherical cap structure; it is used for the entire blade head 2 to be inserted into the cavity, and the blade 23 does not damage the cavity wall; The shape of the notch 221 on the side of the sleeve 21 is set to be rectangular, and the notch angle θ of the notch 221 is set to be 20°~180°; in this embodiment, the notch angle θ is 45°.

[0047] The angle θ is the angle formed by the center of the cross section of the sleeve 21 and the axial side of the notch 221; The sleeve 21 is used to quickly insert into the cavity to protect the blade 23 from damaging the cavity wall; The rear end of the blade 23 is connected to the horn 22, and the front end of the blade 23 is inserted into the top sleeve of the sleeve 21. The blade 23 is arc-shaped and protrudes outward at the notch 221 of the sleeve 21. An arc-shaped gap 3 is formed between the blade and the sleeve 21. If the thickness of the thin layer needs to be changed, the curved portion 231 of different degrees of curvature can be replaced to change the gap 3 between the curved portion 231 of the blade 23 and the notch 221 of the sleeve 21. If the gap 3 is increased, the thickness of the cut layer can be increased, and if the gap 3 is reduced, the cut layer can be thinner. In this embodiment, the protrusion height (i.e., clearance height) between the blade and the wall of the cannula 21 is 1 to 8 mm. The width of the blade 23 is less than or equal to the width of the notch 221 of the cannula 21. The maximum resection thickness of the blade 23 is determined by the protrusion height (i.e., clearance height), and tissue 26 is resected by the blade. In this embodiment, the protrusion height between the blade and the wall of the cannula 21 is 1 to 8 mm to control the resection thickness. A 1 to 5 mm clearance 3 is left between the blade and the edge of the notch 221 of the cannula 21 to allow tissue 26 to be drawn in and assist in blade resection. Figure 6 and Figure 7 The indicated h represents the height of the gap 3 .

[0048] In this embodiment, the replacement method of the bending portion 231 with different bending degrees can be determined according to the connection method between the blade 23 and the amplitude rod 22. If the amplitude rod 22 and the blade 23 are connected by a snap-on structure, they can be directly disassembled and installed by plugging and unplugging; if they are connected by threaded connections, they can be disassembled or installed by rotation.

[0049] like Figure 4 and Figure 5 As shown, the blade 23 is serrated on one or both sides, with the wedge angle (point angle) of the teeth ranging from 35° to 45°. The geometric parameters of the teeth include a tooth depth h of 0.1 to 0.5 mm, preferably 0.3 mm; a tooth pitch d of 0.2 to 1.0 mm, preferably 0.5 mm. The blade 23 of this embodiment is made of a biocompatible metal (such as medical stainless steel 316L or titanium alloy Ti-6Al-4V) with a hardness ≥ HRC 40. When removing vascular plaque, a dense tooth configuration with a tooth depth of 0.2 mm and a tooth pitch of 0.3 mm is used; when removing hyperplastic tissue 26, a coarse tooth configuration with a tooth depth of 0.5 mm and a tooth pitch of 0.8 mm is used.

[0050] The cannula 21 is provided with two water inlet and outlet ports. The water outlet, located at the upper end of the cannula 21, consists of one or more small holes and is used to spray solution to cool the blade and displace turbid liquid within the cavity. The water inlet, located in the middle of the cannula 21, has two functions: first, the outlet of the water pipe 25 generates negative pressure during water absorption, drawing tissue 26 into the gap 3 between the blade and the notch 221 of the cannula 21 for excision; second, it is used to aspirate solution containing tissue 26 fragments within the cavity. In this embodiment, the water inlet 24 or outlet 25 on the cutting head 2 can also be provided with one or more small holes to spray solution to cool the blade and displace turbid liquid within the cavity.

[0051] The ultrasonic scalpel head 2 can achieve the function of thin-layer resection of the tissue 26 by moving parallel to the surface of the tissue 26.

[0052] like Figure 8 and Figure 9 As shown, this embodiment uses an ultrasonic scalpel to remove thin layers of tissue 26. During operation, the handle 1 can be rotated to perform 360° circular removal of the tissue 26 in the cavity. The thickness of a single removal is controlled by the height of the blade 23 protruding from the tube.

[0053] In this embodiment, the gap 3 formed between the curved portion 231 of the blade 23 and the outer wall of the sleeve 21 is used to represent the height h between the plane where the main body of the blade 23 is located and the plane where the notch 221 of the sleeve 21 is located. The cutting thickness is controlled by the height h of the blade 23 protruding from the high pipe. The height h between the plane where the main body of the blade 23 is located and the plane where the notch 221 of the sleeve 21 is located, the radius R, and the notch angle θ satisfy the following formula: h≥R-Rcos(θ / 2); Wherein, h represents the cutting thickness, i.e., h represents the height of the gap between the curved portion 231 of the blade 23 and the outer wall of the sleeve 21; R represents the radius of the sleeve 21; θ represents the notch angle; When the height h of the sheet protruding from the high pipe is equal to R-Rcos(θ / 2), the edge of the blade 23 is exactly on the circumference of the sleeve 21. When the height of the sheet protruding from the high pipe is greater than R-Rcos(θ / 2), the edge of the blade 23 protrudes outside the circumference. In this way, the blade 23 can be controlled on the circumference of the sleeve 21 or located outside the circumferential wall of the sleeve 21, making it easier to control the blade 23 during the rotational cutting process.

[0054] The movement direction of the ultrasonic scalpel head 2 is as follows Figure 9 As shown, the function of thin-layer resection of tissue 26 can be achieved by moving parallel to the surface of tissue 26.

[0055] In this embodiment, diamond grains can also be set on the blade 23, and the setting method is coating or embedding to form a diamond composite structure. Diamond grains with a particle size of 80-150 μm and a volume share of 30%-40% are embedded in the serrated grooves; the particles are fixed by vacuum sintering, and the adhesion strength is ≥50 MPa (test standard: ASTM F1044); it is suitable for the removal of calcified tissue 26 (such as arterial plaque), and the removal efficiency is improved by 130%.

[0056] like Figure 10 、 Figure 11 As shown, Figure 10 The blade 23 of the traditional ultrasonic scalpel is used to perform an excision experiment on the pig's yellow throat tissue 26. This embodiment conducts a comparative experiment on the effects of the blade 23 with an edge and the blade without an edge on the excision efficiency. The blade 2 of the current traditional ultrasonic scalpel is edgeless, and the tissue 26 is clamped by the clamping arm, relying on high-frequency mechanical friction to achieve the purpose of excision of the tissue 26. Without the help of the clamping arm, the excision efficiency is low. The excision experiment on the pig's yellow throat tissue 26 using the blade 23 of the traditional ultrasonic scalpel shows that after more than 10 seconds, the frictional heat generated on the yellow throat causes the tissue 26 to solidify and carbonize, but it is difficult to achieve thin layer excision.

[0057] Figure 11 The ultrasonic scalpel with a serrated blade 23 for thin-layer excision was used. When the cannula 21 was removed, the pig yellow throat tissue 26 was excised using only the serrated blade 23, and the excision experiment using a traditional ultrasonic scalpel was compared.

[0058] Figure 12 and 13 As shown, Figure 12 This is a schematic diagram of pig throat removal using a traditional ultrasonic scalpel without a blade 2. Figure 13 Schematic diagram of the ultrasonic scalpel for thin-layer removal of pig throat using the serrated blade head 2.

[0059] The sharpened serrated blade 23 of this embodiment, with the help of the high-frequency vibration of the transducer, realizes the rapid thin-layer resection of the pig throat tissue 26. The comparative experimental results show that the resection time of the sharpened serrated blade head 2 is significantly reduced, which is only 1 / 3 of the traditional non-sharpened blade head 2. Due to the short resection time and less frictional heat generation, the tissue 26 is not carbonized, and the damage to the surrounding tissue 26 is significantly reduced, thereby improving the safety of the operation.

[0060] Table 1 shows a comparison of the time required for ex vivo thin-layer resection of pig yellow throat using a non-sharpened blade 23 and a serrated blade 23. A total of five groups of experiments were conducted. It can be seen from Table 1 that the average time required for thin-layer resection using the serrated blade 2 is only 1 / 3 of the average time required by the non-sharpened blade 2. During the thin-layer resection process, the serrated blade 2 generates less frictional heat and does not cause carbonization of the tissue 26. The damage to the surrounding tissue 26 is significantly reduced, thereby improving the safety and efficiency of the operation.

[0061] Table 1 A group Group 2 Three groups Four groups Five groups Average time (seconds) Unsharpened blades 20.5 19.0 28.5 22.0 29.0 23.8 Serrated blade 6.3 7.8 10.0 5.0 8.0 7.42 The ultrasonic scalpel head 2 of this embodiment can achieve 360° circular resection of the tissue in the cavity; and can achieve the function of thin layer resection of tissue by moving parallel to the tissue surface.

[0062] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. An ultrasonic scalpel for thin-layer tissue resection, comprising a handle (1) and a scalpel head (2) disposed on the handle (1); characterized in that: The cutter head (2) comprises a sleeve (21), a horn (22) and a blade (23); The amplitude changer (22) is arranged on the handle (1) and connected to the ultrasonic transducer (27); the sleeve (21) covers the blade (23) and has a notch (221) on the side; the blade (23) is connected to the amplitude changer (22); the main body of the blade (23) protrudes from the notch (221) on the side of the sleeve (21), forming a gap (3) to accommodate the tissue (26) and control the resection thickness; the resection side (222) of the blade (23) is serrated on one side or both sides; the handle (1) is provided with a water inlet pipe (24) and a water outlet pipe (25); the water inlet pipe (24) has an opening at the front end of the blade (23), and the water outlet pipe (25) has an opening at the notch (221); the tissue (26) is sucked into the gap (3) and fixed by the negative pressure generated by the water outlet pipe (25) absorbing water.

2. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The main body of the blade (23) protruding from the side notch (221) of the sleeve (21) is configured as a curved portion (231), and a gap (3) is formed between the curved portion (231) and the outer wall of the sleeve (21). The gap (3) is used to accommodate tissue (26) and control the resection thickness.

3. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The sleeve (21) and the handle (1) are connected in a detachable manner.

4. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The blade (23) and the amplitude transformer (22) are connected in a detachable manner.

5. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The top end of the sleeve (21) is a gradually tapering closed frustum or spherical cap structure.

6. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The notch (221) of the sleeve (21) is arc-shaped or rectangular, and the notch angle θ is 20° to 180°.

7. The ultrasonic scalpel for thin-layer tissue resection according to claim 2, wherein: The gap (3) formed between the curved portion (231) and the outer wall of the sleeve (21) is set to 1 to 8 mm.

8. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The wedge angle of the serrated edge of the blade (23) is 35° to 45°.

9. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The outlet pipe (25) is connected to a negative pressure device for generating a suction negative pressure to draw the excised tissue (26) into the gap (3).

10. The ultrasonic scalpel for thin-layer tissue resection according to claim 1, wherein: The gap (3) formed between the curved portion (231) of the blade (23) and the outer wall of the sleeve (21) is used to represent the height h between the plane where the main body of the blade (23) is located and the plane where the notch (221) of the sleeve (21) is located. The height h satisfies the following formula with the radius and the notch angle θ: h≥R-Rcos(θ / 2); wherein h represents the gap height between the curved portion (231) of the blade (23) and the outer wall of the sleeve (21); R represents the radius of the sleeve (21); and θ represents the notch angle.

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