CN115500902B

CN115500902B - Ultrasonic surgical knife

Info

Publication number: CN115500902B
Application number: CN202211253189.6A
Authority: CN
Inventors: 颜忠余; 王磊; 刘柯; 骆威
Original assignee: Innolcon Medical Technology Suzhou Co Ltd
Current assignee: Innolcon Medical Technology Suzhou Co Ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-09-15
Anticipated expiration: 2042-10-13
Also published as: CN115500902A; CN116919535A; WO2024077838A1

Abstract

The application provides an ultrasonic surgical knife which comprises a knife bar and a knife head, wherein the far end of the knife bar is connected with the knife head, and the knife bar comprises a knife bar main body, a first transition step and a second transition step; the first transition step is connected with the proximal end of the cutter bar main body, the second transition step is connected with the distal end of the cutter bar main body, and the cross-section diameter of the first transition step and the second transition step is gradually reduced from the proximal end to the distal end. The second transition step is positioned in the far-end direction of the far-end node, the distance from the far-end node is in the range of (lambda/8-5) mm to (lambda/8+5) mm, and lambda is the wavelength of the ultrasonic wave with the working frequency; the distal node is the first position of the cutter bar in the distal-to-proximal direction where the longitudinal amplitude of the cutter bar is smallest when the ultrasonic surgical blade is in operation. According to the ultrasonic surgical knife, the cutter bar is enabled to be finer through the first transition step, the second transition step and the cutter bar main body, and meanwhile, the cutter bar is ensured to maintain longitudinal vibration, so that the problem that the ultrasonic surgical knife is unstable in vibration mode is solved.

Description

Ultrasonic surgical knife

Technical Field

The application relates to the field of medical instruments, in particular to an ultrasonic surgical knife.

Background

The ultrasonic surgical knife is a surgical instrument capable of obtaining ultrasonic vibration waves through an ultrasonic transducer so as to drive a knife head to cut and coagulate human tissues.

The ultrasonic surgical knife is used as a minimally invasive endoscopic surgical instrument, and is matched with the puncture outfit for operation in the use process, the maximum outer diameter of a cutter bar of the ultrasonic surgical knife is about 5.5 mm, and the diameter of the puncture outfit is limited, so that the surgical wound surface is still oversized when the endoscopic surgery is performed on small physical signs and small organ tissues of pediatrics. In order to reduce the puncture wound during the operation process and shorten the operation recovery time, a thinner ultrasonic surgical knife is required to realize the minimally invasive operation.

However, the ultrasonic surgical knife needs to use high-frequency vibration waves with high amplitude to realize the cutting of tissues, the ultrasonic surgical knife needs to conduct the high-frequency vibration waves in the actual use process, and other vibration modes except the working frequency are easily excited by the nonlinear existence of the ultrasonic surgical knife bar, the material characteristic deviation caused by heating, the errors of processing and assembly and the like, so that the ultrasonic surgical knife is unstable in vibration, the thinner the knife bar is, the more functional characteristics of the knife head are, and the serious the instability tendency is.

Disclosure of Invention

The application provides an ultrasonic surgical knife, which aims to solve the problem that an ultrasonic surgical knife vibration mode is unstable due to an ultrafine knife bar.

According to a first aspect of an embodiment of the present application, there is provided an ultrasonic surgical blade comprising a blade bar and a blade head, wherein a distal end of the blade bar is connected to the blade head; the cutter bar comprises a cutter bar main body, a first transition step and a second transition step; the first transition step is connected with the proximal end of the cutter bar main body, and the cross section diameter of the first transition step is gradually reduced from the proximal end to the distal end; the second transition step is connected with the distal end of the cutter bar main body, and the cross section diameter of the second transition step is gradually reduced from the proximal end to the distal end; the second transition step is positioned in the far-end direction of a far-end node, and the distance between the second transition step and the far-end node is in the range of (lambda/8-5) mm to (lambda/8+5) mm; the lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife works; the distal end node is the first vibration node of the cutter bar in the direction from the distal end to the proximal end; the vibration node is the position with the minimum longitudinal vibration amplitude on the cutter bar when the ultrasonic surgical knife works.

Through set up first transition step and second transition step on the cutter arbor, can make the cutter arbor taper gradually, simultaneously the second transition step sets up in the cutter arbor is from distal end to the distance scope of the first vibration node's of proximal direction distal end direction (lambda/8-5) mm to (lambda/8+5) mm, avoid slender cutter arbor probably to produce the unstable ultrasonic vibration of bending, make the tool bit remain throughout the longitudinal vibration, can effectively reduce the cutter arbor drives the tool bit and shakes in disorder, increases the stability of cutter arbor.

Optionally, the first transition step is located in a distal direction of a proximal node, and a distance between the first transition step and the proximal node is less than or equal to λ/8; the proximal node is the first vibration node of the cutter bar in the direction from the proximal end to the distal end. The first transition step is positioned within one-eighth of a wavelength from the proximal node, enabling optimization of system gain while assisting the second transition step in limiting the creation of unstable vibrations in the tool bar.

Optionally, the length of the cutter bar is greater than or equal to 200mm, and the diameter of the section of the cutter bar main body is 2-3 mm. The cutter arbor sets up to more than or equal to 200mm, can satisfy most art demands, and main part cross-section diameter is 2mm ~ 3mm, can contract the surface of a wound to littleer, avoids the risk that the surface of a wound is too big to bring.

Optionally, the cutter bar further comprises a connecting rod, the connecting rod and the cutter bar main body are cylindrical rods, and the first transition step is in a truncated cone-shaped structure; the connecting rod is connected with the cutter bar main body through the first transition step, and the proximal node is located on the connecting rod. The connecting rod can connect the cutter bar to the ultrasonic transducer so that the ultrasonic surgical knife can work through ultrasonic vibration waves with specific frequency provided by the ultrasonic transducer.

The first transition step comprises a first connecting end and a first transition end, the first connecting end and the first transition end are of round end face structures, and the first connecting end and the first transition end are coaxially arranged; the diameter of the first transition end is smaller than that of the first connecting end; the first transition step is connected with the connecting rod through the first connecting end, and the first transition step is connected with the cutter bar main body through the first transition end. The first transition step of the truncated cone-shaped structure can enable the cutter bar main body to be thinner than the connecting rod, so that the ultrasonic surgical knife can be suitable for surgical operation type requiring wound surface reduction.

The diameter of the first transition end is equal to the diameter of the section of the cutter bar main body, and the diameter of the first connecting end is equal to the connecting rod; the diameter of the first connecting end is larger than 1.5 times the diameter of the first transition end. The large diameter of the connecting rod ensures that the connecting rod can be better connected with the ultrasonic transducer, so that stable high-frequency vibration waves are provided for the cutter rod and the cutter head.

Optionally, the second transition step is in a truncated cone-shaped structure, and the cutter bar is connected with the cutter head through the second transition step; the second transition step is provided with a second connecting end and a second transition end, the second connecting end and the second transition end are of round end face structures, and the second connecting end and the second transition end are coaxially arranged; the diameter of the second transition end is smaller than that of the second connecting end; the second transition step is connected with the cutter bar main body through the second connecting end, and the second transition step is connected with the cutter head through the second transition end. The diameter of the second connecting end is equal to the diameter of the section of the cutter bar main body, and the diameter of the second connecting end is 2-3 mm; the diameter of the second transition end is 1 mm-2 mm. The second transition step is located between cutter arbor and tool bit, and the second transition step of round platform shape structure makes the tool bit for the cutter arbor is finer, conveniently operates.

Optionally, the cutter head includes a cutter head main body, a first cutting part and a second cutting part, and the first cutting part and the second cutting part are respectively arranged on two opposite sides of the cutter head main body; the thickness of the first cutting part and the second cutting part is gradually reduced along the direction from the proximal end to the distal end of the cutter head main body; the lengths of the first cutting part and the second cutting part are lambda/8-lambda/4. The cutting parts are respectively arranged on two sides of the cutter head main body, so that the cutter head has cutting capability in two directions, meanwhile, the length is set to be one eighth wavelength to one fourth wavelength, the occurrence of unstable vibration caused by the cutter head can be reduced, and meanwhile, the auxiliary parts can be conveniently installed.

Optionally, the cutter head is arc-shaped, the first cutting part is of a convex arc-shaped structure, and the second cutting part is of a concave arc-shaped structure; the radius of the second cutting portion is smaller than the radius of the first cutting portion.

Optionally, the radius of the convex arc structure of the first cutting portion is within a range of λ/2±5 mm. The radius of the first cutting part is in the range of lambda/2 plus or minus 5mm, so that when the cutter bar deforms to a certain extent, the cutting function can be maintained, and the unstable vibration generated by the cutter bar can be reduced.

Optionally, the cutter head is straight, and the first cutting part and the second cutting part are both straight blade structures. The straight blade can enable the shape of the cutter head to be more symmetrical, and unstable vibration of the cutter bar is reduced.

Optionally, the lengths of the first cutting part and the second cutting part along the direction from the proximal end to the distal end of the cutter head main body are 10 mm-17 mm. The lengths of the first cutting part and the second cutting part are set to be 10 mm-17 mm so as to be convenient for matching and installing with auxiliary parts, such as clamping parts.

Optionally, the cutter head further includes a third cutting portion, the third cutting portion is in a V-shaped structure, the third cutting portion is disposed at a distal end of the cutter head body, and the third cutting portion is disposed on a side of the cutter head body where the first cutting portion and the second cutting portion are not disposed. The third cutting part is arranged to enrich the functions of the cutter head, so that the ultrasonic surgical knife can be used in multiple functions, and the frequency of replacing operation instruments in operation is reduced.

Optionally, the length of the third cutting part is smaller than or equal to a preset length, and the preset length is 1/2 of the length of the shorter cutting part of the first cutting part and the second cutting part; the third cutting portion is tapered in thickness in a proximal-to-distal direction. The design of third cutting part can make the distal end of tool bit gradually thin to make the tool bit can possess more functions, restrict the length and the angle of third cutting part can weaken the vibration that the tool bit adds third cutting part and bring unstable.

Optionally, the included angle of the V-shaped structure is 60-100 degrees.

Optionally, the cutter bar main body is provided with a cutting groove, the cutting groove and the third cutting part are arranged on the same side, and the cutting groove is arranged between the distal end node and the second transition step. The cutter bar on the same side of the third cutting part is provided with the cutting groove, so that the problem of unstable vibration caused by the arrangement of the third cutting part on one side can be solved.

Optionally, a distance from a proximal end of the incision to the distal node is 4-9 mm; the length of the cutting groove is 2 mm-5 mm, and the depth of the cutting groove is 0.15 mm-0.35 mm. The size and the layout position of the cutting groove can be better matched with the third cutting part, so that the purpose of better limiting other vibration of the cutter bar is achieved.

Optionally, the cutter bar further comprises a plurality of flanges, and the flanges are sleeved on the cutter bar; the flange is arranged at a mounting node of the cutter bar, and the mounting node is other vibration nodes except the proximal node on the cutter bar. The flange can improve the supporting strength of the cutter bar, and simultaneously reduces part of rigidity of the distal end of the cutter bar, so that the clamping force distribution is more uniform in the auxiliary clamping process of the ultrasonic surgical knife.

Optionally, the number of the flanges is at least three, each flange is respectively arranged at the far-end node and a mounting node with a distance of lambda/2×n from the far-end node, and N is a positive integer. The flange is arranged to improve the deformation phenomenon of the cutter bar in the clamping process of the ultrasonic surgical knife, so that the deformation of the cutter bar main body is reduced, and the maximum deformation of the cutter bar main body is limited.

According to a second aspect of embodiments of the present application, there is provided an ultrasonic surgical blade comprising a blade body, a first transition step and a second transition step, wherein: the first transition step is connected with the proximal end of the cutter bar main body, and the cross section diameter of the first transition step is gradually reduced from the proximal end to the distal end; the second transition step is connected with the distal end of the cutter bar main body, and the cross section diameter of the second transition step is gradually reduced from the proximal end to the distal end; the second transition step is positioned in the far-end direction of a far-end node, and the distance between the second transition step and the far-end node is in the range of (lambda/8-5) mm to (lambda/8+5) mm; the lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife works; the distal end node is the first vibration node of the cutter bar in the direction from the distal end to the proximal end; the vibration node is the position with the minimum longitudinal vibration amplitude on the cutter bar when the ultrasonic surgical knife works.

According to a third aspect of embodiments of the present application, there is provided an ultrasonic surgical blade comprising a blade body, a first cutting portion, and a second cutting portion, wherein: the first cutting part and the second cutting part are respectively arranged on two opposite side surfaces of the cutter head main body; the thickness of the first cutting part and the second cutting part is gradually reduced along the direction from the proximal end to the distal end of the cutter head main body; the lengths of the first cutting part and the second cutting part are lambda/8-lambda/4; and lambda is the wavelength of ultrasonic waves when the ultrasonic surgical tool bit works.

According to the technical scheme, the ultrasonic surgical knife comprises a knife bar and a knife head, wherein the far end of the knife bar is connected with the knife head, and the knife bar comprises a knife bar main body, a first transition step and a second transition step; the first transition step is connected with the proximal end of the cutter bar main body, and the cross section diameter of the first transition step is gradually reduced from the proximal end to the distal end; the second transition step is connected with the distal end of the cutter bar main body, and the cross section diameter of the second transition step is gradually reduced from the proximal end to the distal end; the second transition step is positioned in the far-end direction of a far-end node, and the distance between the second transition step and the far-end node is in the range of (lambda/8-5) mm to (lambda/8+5) mm, wherein lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife works; the distal end node is the first vibration node of the cutter bar in the direction from the distal end to the proximal end; the vibration node is the position with the minimum longitudinal amplitude on the cutter bar when the ultrasonic surgical knife works. According to the ultrasonic surgical knife, the cutter bar is enabled to be finer through the first transition step, the second transition step and the cutter bar main body, and meanwhile, the cutter bar is ensured to maintain longitudinal vibration, so that the problem that the ultrasonic surgical knife is unstable in vibration mode is solved.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic view of an ultrasonic surgical blade according to an embodiment of the present application;

FIG. 2 is a schematic view of a tool tip and distal end of a tool holder according to an embodiment of the application;

FIG. 3 is a schematic top view of a tool tip and distal end of a tool holder according to an embodiment of the application;

FIG. 4 is a schematic side view of a tool tip and distal end of a tool holder according to an embodiment of the application;

FIG. 5 is a schematic view of another embodiment of the present application showing the structure of the distal ends of the tool tip and tool shank;

FIG. 6 is a schematic view of a cutter bar according to an embodiment of the present application;

FIG. 7 is a schematic view of a tool tip, distal end of a tool holder, and a slot according to an embodiment of the application;

FIG. 8 is a schematic view of another embodiment of the present application of a tool tip, distal end of a tool holder, and a slot.

Illustration of: 1-a cutter bar; 2-a cutter head; 10-a cutter bar main body; 11-a first transition step; 12-a second transition step; 13-connecting rods; 14-a flange; 20-a cutter head body; 21-a first cutting portion; 22-a second cutting portion; 23-a third cut; 100-grooving; 101-a remote node; 102-a proximal node; 111-a first connection; 112-a first transition end; 121-a second connection; 122-a second transition end.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of apparatus and methods consistent with some aspects of the application as set forth in the claims.

In the embodiment of the application, the ultrasonic surgical knife is a surgical instrument which can drive high-frequency ultrasonic vibration waves emitted by an ultrasonic transducer and is applied to endoscopic minimally invasive surgery. The ultrasonic vibration wave emitted by the ultrasonic transducer is mechanical wave, the mechanical wave has the characteristic that the wave speed changes along with the change of the medium, and the wavelength is determined by the wave speed and the frequency, so that the wavelength of the mechanical wave is related to the material of the ultrasonic surgical knife and the frequency of the mechanical wave. The ultrasonic transducer used by the ultrasonic surgical knife is in a handle shape, a control key and a knife bar interface are arranged, the ultrasonic surgical knife can be connected with the knife bar interface of the ultrasonic transducer through the proximal end of the knife bar, so that ultrasonic waves emitted by the ultrasonic transducer are obtained, and in the embodiment of the application, the ultrasonic waves emitted by the ultrasonic transducer are longitudinal waves.

The ultrasonic surgical knife is commonly used together with a puncture outfit, an endoscope and other devices in the operation, and the puncture outfit is mainly used for puncturing a body cavity of a patient and providing a channel for the ultrasonic surgical knife to enter the body cavity; the endoscope is mainly used for observing the internal condition of a body cavity of a patient outside, and is convenient for cutting, hemostasis and other operations on an affected part by using an ultrasonic surgical knife.

In some embodiments, the maximum outer diameter of the ultrasonic-surgical-blade-bar is around 5.5mm, which limits the use of the puncture outfit, so that the surgical wound is still too large. Especially for pediatric and other minimally invasive surgery on smaller or smaller organs, smaller wound surfaces are needed to ensure the safety of surgery and postoperative recovery, so that an ultrasonic scalpel with a more slender cutter bar is needed to be matched with a thinner puncture outfit for minimally invasive surgery. However, the slender cutter bar has vibration modes other than the working frequency which are easily excited by the existence of nonlinearity of the cutter bar surface, material characteristic deviation caused by heating, errors in machining and assembly and the like, so that the ultrasonic surgical knife is unstable in vibration.

The other vibration modes of the ultrasonic surgical knife are messy vibration generated by the knife bar, and the main reason for the messy vibration is that the slender ultrasonic knife bar can enable a plurality of resonance modes with resonance frequency close to the working frequency of the ultrasonic surgical knife or the frequency doubling and frequency dividing resonance modes of the working frequency, and when the ultrasonic surgical knife works on the basis, the ultrasonic vibration wave with the working frequency can excite the other resonance modes in the ultrasonic knife bar, so that the knife bar is messy.

In order to alleviate the problem that the ultrasonic surgical knife vibration mode is unstable due to the superfine knife bar, some embodiments of the application provide an ultrasonic surgical knife. Referring to fig. 1, a schematic structural view of an ultrasonic surgical blade according to an embodiment of the present application is shown. As shown in fig. 1, the ultrasonic surgical knife provided by the application comprises a knife bar 1 and a knife head 2, wherein the far end of the knife bar 1 is connected with the knife head 2. It should be noted that, the distal end and the proximal end are determined according to the distance from the user in the use process of the ultrasonic surgical knife, one end closer to the user is the proximal end of the knife bar 1, the other end is the distal end of the knife bar 1, and on the knife head 2, one end closer to the user is the proximal end of the knife head 2, and the other end is the distal end of the knife head 2. Further, during the connection of the cutter bar 1 with the cutter head 2, the distal end of the cutter bar 1 is connected with the proximal end of the cutter head 2.

As shown in fig. 1, the cutter bar 1 includes a cutter bar body 10, a first transition step 11, and a second transition step 12, wherein the first transition step 11 is connected to the proximal end of the cutter bar body 10, and the first transition step 11 has a cross-sectional diameter that decreases from the proximal end to the distal end. The proximal and distal directions of the internal components of the cutter bar 1 are the same as those of the cutter bar 1, and the purpose of the first transition step 11, which is to gradually decrease the cross-sectional diameter from the proximal to the distal direction, is to transition from the interface of the ultrasonic transducer and the ultrasonic surgical blade to the cutter bar body 10 so that the cutter bar body 10 is sufficiently slim.

The second transition step 12 is connected to the distal end of the cutter bar body 10, and the second transition step 12 has a cross-sectional diameter gradually decreasing from the proximal end to the distal end. The purpose of the decreasing cross-sectional diameter of the second transition step 12 is to limit the size of the tool tip so that the ultrasonic surgical blade can perform finer operations.

The second transition step 12 is located in the distal direction of the distal node 101 and at a distance from the distal node 101 of more than lambda/8. Wherein lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife works, namely the wavelength of ultrasonic waves output by the ultrasonic transducer. The distal node 101 is the first vibration node of the cutter bar 1 in the direction from the distal end to the proximal end, and the vibration node is the position on the cutter bar 1 where the longitudinal amplitude is minimum when the ultrasonic surgical blade is in operation.

The λ and the position of the distal node 101 are determined according to the material and the operating frequency of the ultrasonic surgical blade as required. In some embodiments of the application, the operating frequency of the ultrasonic surgical blade is 55kHz to 56.5kHz, and the lambda, i.e. the wavelength of the ultrasonic waves on the blade bar 1 is 87 to 95mm due to the difference in materials.

For example, in some embodiments, the length of the cutter bar 1 may be 240mm, wherein the length of the cutter bar body 10 is 210mm, the maximum outer diameter of the cutter bar body 10 is 2.3mm, the length of the first transition step 11 is 10mm, the length of the second transition step 12 is 3mm, and the length of the junction of the cutter bar 1 and the ultrasonic transducer is 17mm; the length of the cutter head 2 may be 25mm. On the basis, the whole length of the ultrasonic surgical knife is 265mm.

Because the distal end node 101 is the position with the minimum longitudinal amplitude of the ultrasonic scalpel during operation, the position of the second transition step 12 is set by taking the position as an anchor point, so that the vibration generated by the cutter bar 1 and the cutter head 2 can be better controlled, and the cutter bar 1 is prevented from being connected with the cutter head 2 to be in a position close to the operating frequency or harmonic frequency thereof. Further, the cutter bar 1 can be made to perform work such as cutting while reducing the disturbance and maintaining the longitudinal vibration.

As shown in fig. 1, the first transition step 11 is located in the distal direction of the proximal node 102, and the spacing between the first transition step 11 and the proximal node 102 is less than or equal to λ/8. Wherein the proximal node 102 is the first vibration node of the tool bar 1 in the proximal to distal direction. In some embodiments, λ/8 is about 11-12 mm, i.e. the first transition step 11 is less than or equal to 12mm from the proximal node 102, since λ is in the range of 87-95 mm. In other embodiments, however, the first transition step 11 is spaced from the proximal node 102 by a distance in the range of 1mm to 5mm in order to provide for a more stable and gain-adjusting tool bar 1.

Specifically, in some embodiments of the present application, the second transition step 12 is located in the range of (λ/8-5) mm to (λ/8+5) mm in the distal direction of the distal end node 101, and the furthest distance of the second transition step 12 from the distal end node 101 is limited due to consideration of the overall gain and constraint of other resonance modes of the cutter head 2, i.e., the second transition step 12 is located in the range of (λ/8-5) mm to (λ/8+5) mm in the distal direction of the distal end node 101. Thus in some embodiments, the second transition step 12 is spaced from the distal node 101 by a distance in the range of 6mm to 17 mm.

In some embodiments of the present application, in order to mount the cutter bar 1 and the cutter head 2 to the ultrasonic transducer interface, the cutter bar 1 further comprises a connecting rod 13, and the cutter bar 1 is fixed to the ultrasonic transducer by the connecting rod 13 to perform work. The connecting rod 13 and the cutter bar main body 10 are cylindrical rods, so that the condition that the cutter bar 1 is unstable in vibration caused by edges is avoided, and the first transition step 11 is of a round table-shaped structure and is used for connecting the connecting rod 13 and the cutter bar main body 10 in a matched mode. The connecting rod 13 is connected to the tool bar body 10 by a first transition step 11, and the proximal node 102 is located on the connecting rod 13. Because the first transition step 11 is disposed in the distal direction of the proximal node 102, the proximal node 102 is located on the connecting rod 13, and thus in some embodiments, the distal spacing of the proximal node 102 and the connecting rod 13 is equal to the spacing of the proximal node 102 and the first transition step 11, i.e., the distal spacing of the proximal node 102 and the connecting rod 13 is less than or equal to λ/8.

Since the first transition step 11 has a truncated cone-like structure in some embodiments, the first transition step 11 includes two rounded end surface structures, namely a first connection end 111 and a first transition end 112. And the first connecting end 111 and the first transition end 112 are coaxially arranged, and the diameter of the first transition end 112 is smaller than that of the first connecting end 111. The first transition step 11 is connected to the connecting rod 13 via a first connecting end 111, and the first transition step 11 is connected to the tool bar body 10 via a first transition end 112. Since the first connecting end 111 and the first transition end 112 are coaxially arranged, and the connecting rod 13 is connected to the tool bar body 10 through the first transition step 11, the connecting rod 13 and the tool bar body 10 are also coaxially arranged. The strength of the whole cutter bar 1 is further enhanced, and meanwhile, the vibration of the cutter bar 1, which is influenced by the nonlinear position, is avoided.

In the present embodiment, since the first transition step 11 has a truncated cone-shaped structure, the cross-section of the first transition step 11 is isosceles trapezoid, but in some embodiments, two sides of the cross-section of the first transition step 11 may be curved. The curved side edge can also achieve the purpose of limiting the cross-sectional diameter of the tool bar body 10 while ensuring that the relationship between the diameters of the first connecting end 111 and the first transition end 112 is unchanged.

Specifically, in some embodiments, the overall length of the cutter bar 1 is greater than or equal to 200mm, and the cross-sectional diameter of the cutter bar body 10 is 2mm to 3mm. The slender cutter bar 1 can enable the wound surface of the ultrasonic surgical knife to be smaller in the surgical process, and is more convenient for the postoperative recovery of a patient. The diameter of the first transition end 112 is equal to the diameter of the cross section of the cutter bar main body 10, so that the mismatch of the first transition step 11 and the cutter bar main body 10 can be avoided, and the integral vibration condition of the ultrasonic surgical knife is further influenced. The diameter of the first connecting end 111 is equal to that of the connecting rod 13, and the diameter of the first connecting end 111 is greater than 1.5 times that of the first transition end 112, namely, the cross-sectional diameter of the connecting rod 13 is greater than 1.5 times that of the cutter rod main body 10, and the connecting rod 13 can be stably mounted on an ultrasonic transducer so as to provide high-frequency ultrasonic waves for an ultrasonic surgical knife. In some embodiments, the overall length of the ultrasonic surgical blade may be 265mm to 275mm in order for the blade bar 1 to have a sufficient length to operate.

It should be noted that, in the process of connecting the cutter bar main body 10, the first transition step 11 and the connecting rod 13, the cutter bar main body 10, the first transition step 11 and the connecting rod 13 may be implemented by threaded connection or integral formation, but due to a certain gap existing in the threaded connection, the unstable vibration of the cutter bar 1 may be aggravated, and in some embodiments of the present application, the connection between the cutter bar main body 10, the first transition step 11 and the connecting rod 13 may be implemented by adopting an integral formation manner.

In some embodiments of the application, the second transition step 12 is also of a frustoconical configuration, the shank 1 being connected to the cutting head 2 via the second transition step 12. The second transition step 12 of the frustoconical configuration can limit the diameter of the cutting head 2 to be smaller than the diameter of the shank 1. The second transition step 12 is provided with a second connecting end 121 and a second transition end 122, the second connecting end 121 and the second transition end 122 are of a circular end face structure, the second connecting end 121 and the second transition end 122 are coaxially arranged, and the diameter of the second transition end 122 is smaller than that of the second connecting end 121.

During the connection of the tool shank 1 to the tool bit 2, the second transition step 12 is connected to the tool shank body 10 via the second connection end 121, and the second transition step 12 is connected to the tool bit 2 via the second transition end 122.

Specifically, the second transition step 12 is connected to the distal end of the tool holder body 10 by a second connection end 121, and the second transition step 12 is connected to the proximal end of the tool bit 2 by a second transition end 122. Also because in some embodiments the diameter of the second connecting end 121 is equal to the cross-sectional diameter of the tool bar body 10, the diameter of the second connecting end 121 is 2mm to 3mm and the diameter of the second transition end 122 is 1mm to 2mm. Thus, the proximal end of the cutter head 2 has a diameter of 1mm to 2mm. Meanwhile, in some embodiments, in order to achieve the objects of better wound surface reduction and vibration stability, the diameter of the cutter bar main body 10 can be selected to be 2.1 mm-2.6 mm.

In order to stabilize the vibration state of the cutter bar 1 while providing the cutting function to the cutter head 2 of the ultrasonic surgical blade, as shown in fig. 2 to 4, and fig. 7, the cutter head 2 includes a cutter head main body 20, a first cutting portion 21, and a second cutting portion 22. The first cutting portion 21 and the second cutting portion 22 are disposed on two opposite sides of the tool bit body 20, that is, the first cutting portion 21 and the second cutting portion 22 are disposed opposite to each other, and since the ultrasonic surgical blade is driven by the high-frequency ultrasonic vibration wave, which is a longitudinal wave, in some embodiments, the first cutting portion 21 and the second cutting portion 22 are disposed on both sides of the propagation direction of the ultrasonic vibration wave. The first cutting portion 21 and the second cutting portion 22 can cut the tissues on both sides, respectively, and the operation is facilitated. Meanwhile, the thicknesses of the first cutting part 21 and the second cutting part 22 are gradually reduced along the direction from the proximal end to the distal end of the cutter head main body 20, so that the distal end of the cutter head main body 20 forms an extremely thin tip to cut thin tissues.

The shape of the cutting part commonly used for cutting is provided with a straight blade and an arc blade, wherein a straight line is arranged between the proximal end and the distal end of the straight blade, and no angle change exists; the proximal end and the distal end of the arc-shaped blade are positioned on an arc, and a certain angle is changed. The arc-shaped blade has more functions than the straight blade. In some embodiments of the present application, as shown in fig. 2 to 4, the cutter head 2 has an arc shape, the first cutting portion 21 has a convex arc structure, and the second cutting portion 22 has a concave arc structure, on the basis that the cutter head body 20 has a cylindrical rod with a certain arc shape, and the length of the cutter head body 20 is greater than the length of the longer cutting portion of the first cutting portion 21 and the second cutting portion 22. Meanwhile, since the first cutting part 21 is in a convex arc structure, the second cutting part 22 is in a concave arc structure, and the cutter head main body 20 is arranged between the first cutting part 21 and the second cutting part 22, when the curvature of the radian of the first cutting part 21 and the curvature of the second cutting part 22 are approximate, the arc radius of the second cutting part 22 is smaller than that of the first cutting part 21.

In some embodiments, since the first cutting portion 21 and the second cutting portion 22 taper in the proximal-to-distal direction, the distal end of the cutter head 2 correspondingly thins, and the distal end of the cutter head body 20 is thinner relative to the proximal end, in this embodiment, the cutter head body 20 may be a truncated cone-shaped rod with a certain curvature, and the distal end diameter of the cutter head body 20 is smaller than the proximal end diameter of the cutter head body 20.

In order to prevent the stability of vibration of the ultrasonic surgical knife from being affected by the additional cutter head 2, the first cutting part 21 and the second cutting part 22 should be arranged as symmetrically as possible, and the difference of the axial lengths of the first cutting part 21 and the second cutting part 22 is smaller than 1.5mm. The axial length refers to the length of the first cutting portion 21 and the second cutting portion 22 in the proximal to distal direction of the knife bar 1. Because the first cutting part 21 and the second cutting part 22 are arc-shaped, the actual length measurement between the two cutting parts is difficult, and meanwhile, because the high-frequency ultrasonic wave for driving the ultrasonic surgical knife to work is longitudinal wave transmitted along the direction from the proximal end to the distal end of the cutter bar 1, the difference of the axial length between the first cutting part 21 and the second cutting part 22 is controlled to be not more than 1.5mm, so that the influence of the cutter head 2 on the vibration stability of the cutter bar 1 can be reduced to the minimum.

Specifically, the radius of the convex arc structure of the first cutting part 21 is in the range of λ/2±5mm, and the first cutting part 21 with the radius in the range can not greatly increase the movable radius of the cutter head 2 under the condition of ensuring a certain radian, so that the wound surface formed when the cutter head 2 is used is kept in a smaller state, and meanwhile, the cutting function can be maintained and the unstable vibration generated by the cutter bar 1 can be reduced when the cutter bar 1 is deformed to a certain extent.

In another embodiment of the present application, as shown in fig. 5, the tool bit 2 is straight, and the first cutting portion 21 and the second cutting portion 22 are both straight blade structures. On the basis of this, the tool bit body 20 can be a cylindrical rod, the tool bit body 20 being connected to the tool shank 1 via the second transition step 12. The first cutting portion 21 and the second cutting portion 22 of the straight-type cutter head 2 are symmetrically disposed on both sides of the cutter head body 20. Meanwhile, in order to reduce the influence on the vibration state of the cutter bar 1, the difference in length between the first cutting part 21 and the second cutting part 22 is less than 1.5mm. It should be noted that, since the tool bit 2 tapers from the proximal end to the distal end, the tool bit body 20 may be a circular truncated cone-shaped rod, and the diameter of the distal end section of the tool bit body 20 is smaller than the diameter of the proximal end section of the tool bit body 20, and in some embodiments, the diameter of the distal end section of the tool bit body 20 is smaller than 1mm.

Meanwhile, in order to maintain the symmetry of the whole and stabilize the cutter bar 1, the lengths of the first cutting part 21 and the second cutting part 22 are lambda/8-lambda/4, and the lengths of the first cutting part 21 and the second cutting part 22 are 10 mm-20 mm according to the common wavelength calculation of the ultrasonic surgical knife. Specifically, in some embodiments of the present application, the lengths of the first cutting portion 21 and the second cutting portion 22 along the proximal-to-distal direction of the cutter head body 20 may be selected to be 10mm to 17mm.

It should be noted that, in some embodiments, the cutter head 2 is arc-shaped, and the lengths of the first cutting portion 21 and the second cutting portion 22 are axial lengths along the proximal-to-distal direction of the cutter head main body 20; in another embodiment, the tool bit 2 is straight, and the lengths of the first cutting portion 21 and the second cutting portion 22 are the actual lengths of the first cutting portion 21 and the second cutting portion 22.

In order to adapt the ultrasonic surgical blade to more scenes, the number of times of replacing instruments in the operation is reduced, and the ultrasonic surgical blade can be realized by increasing the functions of the cutter head 2. As shown in fig. 2 to 5, the cutter head 2 further includes a third cutting portion 23, the third cutting portion 23 is of a V-shaped structure and is disposed at the distal end of the cutter head body 20, the third cutting portion 23 of the V-shaped structure enables the distal end of the cutter head 2 to be slimmer, and at the same time, the third cutting portion 23 also has a cutting function, which enables insertion and cutting of thin tissue.

The third cutting portion 23 is configured to increase the function of the cutter head 2 and make the cutter head 2 finer, and the third cutting portion 23 cannot be overlapped with other cutting portions, that is, the third cutting portion 23 is located on a side of the cutter head body 20 where the first cutting portion 21 and the second cutting portion 22 are not located, for example, the first cutting portion 21 and the second cutting portion 22 are located on left and right sides of the cutter head body 20, and the third cutting portion 23 needs to be located on an upper side or a lower side of the cutter head body 20.

In order to ensure stability of vibration of the cutter bar 1 without the cutter bar 1 being affected by the cutter head 2, it is necessary to limit the size of the third cutting portion 23 added to the cutter head 2. In some embodiments, the length of the third cutting portion 23 is less than or equal to a preset length, and the preset length is 1/2 of the length of the shorter cutting portion of the first cutting portion 21 and the second cutting portion 22.

Since the lengths of the first cutting portion 21 and the second cutting portion 22 are λ/8 to λ/4, the preset length of the third cutting portion 23 is λ/16 to λ/8, and specifically, the preset length may be 5mm to 10mm. Since the length of the third cutting portion 23 is less than or equal to the preset length, in some embodiments, the length of the third cutting portion 23 may be selected to be 4mm to 7mm.

It should be noted that the size of the third cutting portion 23 cannot be greater than 1/2 of the length of the shorter cutting portion of the first cutting portion 21 and the second cutting portion 22, that is, the lengths of the first cutting portion 21 and the second cutting portion 22 are both greater than or equal to 2 times the length of the third cutting portion 23. If the length of the first cutting part 21 or the second cutting part 22 is less than 2 times the length of the third cutting part 23, unstable vibration of the cutter bar 1 is aggravated. Therefore, when the lengths of the first cutting portion 21 and the second cutting portion 22 are both greater than or equal to 14mm, the length of the third cutting portion 23 can be set to 7mm, and the length of the third cutting portion 23 takes other values, which will not be described in detail in the present disclosure.

The third cutting portion 23 is thinner in the proximal to distal direction, which makes the distal end of the cutter head body 20 finer, thereby enabling the ultrasonic surgical blade to better insert and cut the thin tissue of the human body. In order to realize the cutting function of the third cutting part 23, in some embodiments, the included angle of the V-shaped structure is 60 ° to 100 °, and the V-shaped structure with the included angle has both the inserting and cutting functions, and the function of the ultrasonic surgical knife is added.

In some embodiments of the present application, in order to avoid the third cutting portion 23 from damaging the vibration stability of the cutter bar 1, as shown in fig. 1, the cutter bar body 10 is provided with a cutting groove 100, and the cutting groove 100 is provided to reduce the ultrasonic vibration of the cutter bar 1 caused by adding the third cutting portion 23, which is generated by bending instability.

The kerf 100 needs to be arranged on the same side as the third cutting portion 23 in order to balance the unstable vibration caused by the third cutting portion 23. Meanwhile, the kerf 100 is disposed between the distal node 101 and the second transition step 12 while the kerf 100 is not more than λ/8 from the distal node 101, e.g., the kerf 100 may be disposed at a midpoint of the distal node 101 at the second transition step 12.

Since the purpose of the slot 100 is to reduce unstable vibration caused by the independent provision of the third cutting portion 23, there is no requirement for shape, and thus the slot 100 may be provided in various shapes, as shown in fig. 3, 5, 7, 8, the slot 100 may be in the shape of a kidney-shaped slot, a rectangular slot, an oval slot, etc., wherein the kidney-shaped slot is a shallow slot with both sides being semi-circular arc and a middle being rectangular, and the specific shape of the slot 100 is not limited in the present application.

Specifically, in order to reduce the occurrence of bending unstable vibration of the cutter bar 1, the installation position and size of the notch 100 are correlated with the size of the third cutting part 23. In some embodiments, the proximal and distal nodes 101 of the slot 100 may be set at a distance of 4-9 mm. The larger the size of the third cutting portion 23 is, the larger the corresponding size of the slit 100 is, the length of the slit 100 ranges from 2mm to 5mm, and the depth of the slit 100 ranges from 0.15mm to 0.35mm.

In some embodiments of the application, as shown in fig. 7, the slot 100 may extend through the second transition step 12 such that the distal end of the slot 100 is in contact with the cutting head 2. Since the third cutting portion 23 is disposed on one side of the cutter head 2 alone to change the mass and shape of the cutter head 2, and thus to increase the unstable vibration of the cutter head 2, and the kerf 100 is used to balance the change of the third cutting portion 23, so as to maintain stable longitudinal vibration of the cutter head 2, in this embodiment, the kerf 100 may have a length greater than 5mm, the depth of the opposing kerf 100 may be less than 0.15mm, and the kerf 100 may be used to balance the influence of the third cutting portion 23. Meanwhile, in the embodiment, the through-type cutting groove 100 is convenient to process, and in the practical application process of the ultrasonic surgical knife, the through-type cutting groove 100 can also increase the gap between the distal end of the knife bar 1 and the matched device, so that the knife bar 1 is prevented from contacting with other devices.

In some embodiments of the present application, in order to increase the supporting strength of the tool bar 1, as shown in fig. 1 and 6, the tool bar 1 further includes a plurality of flanges 14, and the flanges 14 are sleeved on the tool bar 1. It should be noted that, the flange 14 may be integrally formed with the cutter bar 1; in addition, the flange 14 may be an independent part, and the flange 14 is sleeved on the cutter bar 1 by welding, riveting or bonding, and the specific connection mode is not limited in the application. Meanwhile, the flange 14 is not only arranged at the proximal node 102, but also at the mounting node extending along the axial direction of the cutter bar 1, wherein the mounting node is other vibration nodes except the proximal node 102 on the cutter bar 1, and the flange 14 is not arranged on the first transition step 11 and the second transition step 12 because of the common interval lambda/2 between the adjacent vibration nodes.

In some embodiments, in order to increase the supporting strength of the cutter bar 1 and simultaneously reduce the local structural rigidity at the distal end of the cutter bar 1, so that the cutter bar 1 gradually increases the rigidity from the distal end to the proximal end, and improves the uniformity of the clamping force applied to the cutter head 2, the number of flanges 14 needs to be limited to a certain extent, in some embodiments, the number of flanges 14 needs to be greater than or equal to three, and each flange 14 is respectively disposed at the distal end node 101 and at the mounting node at a distance λ/2×n from the distal end node 101, where N is a positive integer. Specifically, the specific value of N is the number of flanges 14 minus one, that is, when three flanges 14 are provided, the value of N is 2; when four flanges 14 are provided, the value of N is 3.

For example, the number of flanges 14 may be set to three, with three flanges 14 being provided at the distal node 101 and at two mounting nodes at distances λ/2 and λ from the distal node 101, respectively, i.e. the maximum spacing between the flanges 14 does not exceed λ, whereas the distal node 101 is the first vibration node in the distal to proximal direction of the tool bar 1. Since in most embodiments, the length of the cutter bar 1 is greater than or equal to 200mm, and the longitudinal wave wavelength on the cutter bar 1 is about 87 mm-95 mm, in this embodiment, the area of the cutter bar 1 where the flange 14 is disposed is less than half of the length of the cutter bar 1, which not only serves the purpose of reducing the local structural rigidity of the distal end of the cutter bar 1, but also does not make the overall rigidity of the cutter bar 1 too low.

It should be noted that the width of the flange 14 needs to be less than or equal to 1mm, and the maximum outer diameter of the flange 14 to the distal end of the cutter bar 1 should be increased by less than 1mm. Thereby avoiding great influence on the vibration stability and the maximum outer diameter of the cutter bar 1.

Based on the above-mentioned ultrasonic surgical knife, as shown in fig. 1 and 6, the present application further provides an ultrasonic surgical knife bar, which comprises a knife bar main body 10, a first transition step 11 and a second transition step 12, wherein the first transition step 11 is connected with the proximal end of the knife bar main body 10, the cross-sectional diameter of the first transition step 11 is gradually reduced from the proximal end to the distal end, the second transition step 12 is connected with the distal end of the knife bar main body 10, and the cross-sectional diameter of the second transition step 12 is gradually reduced from the proximal end to the distal end. The first transition step 11 and the second transition step 12 can make the cutter bar main body 10 more slim, so that the diameter of the cutter bar main body 10 can meet the requirement of performing minimally invasive surgery with smaller wound surface. While the second transition step 12 is located in the distal direction of the distal node 101, and the distance between the second transition step 12 and the distal node 101 is in the range of (lambda/8-5) mm to (lambda/8+5) mm, where lambda is the wavelength of the ultrasonic wave when the cutter bar works, and the distal node 101 is the position where the first longitudinal amplitude of the cutter bar 1 in the distal-to-proximal direction is the smallest. The second transition step 12 can reduce the generation of non-longitudinal vibration on the cutter bar 1 when the cutter bar 1 is connected with the cutter head 2 through the position setting, and the stability of the cutter bar 1 is increased, so that the slender ultrasonic surgical cutter bar can stably perform the longitudinal vibration under the driving of the ultrasonic wave with the working frequency.

Based on the above-mentioned ultrasonic surgical blade, as shown in fig. 2, the present application further provides an ultrasonic surgical blade, which includes a blade body 20, a first cutting portion 21 and a second cutting portion 22, wherein the first cutting portion 21 and the second cutting portion 22 are respectively disposed on two opposite sides of the blade body 20, and in some embodiments, since the ultrasonic waves driving the ultrasonic surgical blade are longitudinal waves, the first cutting portion 21 and the second cutting portion 22 may be disposed on the left and right sides of the blade body 20, i.e. on the left and right sides of the propagation direction of the ultrasonic waves, so as to cut tissues. The thickness of the first cutting part 21 and the second cutting part 22 is gradually reduced along the direction from the proximal end to the distal end of the cutter head main body 20, so that the distal end of the cutter head main body 20 is thinner, and the ultrasonic surgical cutter head achieves better cutting effect. The lengths of the first cutting part 21 and the second cutting part 22 are lambda/8-lambda/4, lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife head works, and the influence of the knife head on the knife bar 1 can be reduced by limiting the lengths of the cutting parts, so that the instability of vibration of the ultrasonic surgical knife is reduced.

As can be seen from the above technical solution, the present application provides an ultrasonic surgical knife, which comprises a knife bar 1 and a knife head 2, wherein the far end of the knife bar 1 is connected with the knife head 2, and the knife bar 1 comprises a knife bar main body 10, a first transition step 11 and a second transition step 12; the first transition step 11 is connected to the proximal end of the cutter bar body 10, the second transition step 12 is connected to the distal end of the cutter bar body 10, and the cross-sectional diameters of the first transition step 11 and the second transition step 12 decrease from the proximal end to the distal end. The second transition step 12 is located in the distal direction of the distal node 101, and the distance of the second transition step 12 from the distal node 101 is in the range of (λ/8-5) mm to (λ/8+5) mm, where λ is the wavelength of the ultrasonic wave when the cutter bar 1 is operated. Distal node 101 is the first position on shaft 1 in the distal to proximal direction where the longitudinal amplitude of shaft 1 is minimal when the ultrasonic surgical blade is in operation. According to the ultrasonic surgical knife, the cutter bar is made finer through the first transition step 11, the second transition step 12 and the cutter bar main body 10, and meanwhile, the cutter bar 1 is ensured to maintain longitudinal vibration, so that the problem that the ultrasonic surgical knife is unstable in vibration mode is solved.

The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.

Claims

1. An ultrasonic surgical knife, characterized by comprising a knife bar (1) and a knife head (2), wherein:

the far end of the cutter bar (1) is connected with the cutter head (2);

the cutter bar (1) comprises a cutter bar main body (10), a first transition step (11) and a second transition step (12); the first transition step (11) is connected with the proximal end of the cutter bar main body (10), and the cross section diameter of the first transition step (11) is gradually reduced from the proximal end to the distal end;

the second transition step (12) is connected with the distal end of the cutter bar main body (10), and the cross section diameter of the second transition step (12) gradually decreases from the proximal end to the distal end; the second transition step (12) is positioned in the distal direction of the distal node (101), and the distance between the second transition step (12) and the distal node (101) is in the range of (lambda/8-5) mm to (lambda/8+5) mm; the lambda is the wavelength of ultrasonic waves when the ultrasonic surgical knife works; the distal node (101) is the first vibration node of the cutter bar (1) in the direction from the distal end to the proximal end; the vibration node is the position with the minimum longitudinal vibration amplitude on the cutter bar (1) when the ultrasonic surgical knife works.

2. The ultrasonic surgical blade of claim 1, wherein the first transition step (11) is located in a distal direction of a proximal node (102), a spacing between the first transition step (11) and the proximal node (102) being less than or equal to λ/8; the proximal node (102) is the first vibration node of the cutter bar (1) in the proximal-to-distal direction.

3. Ultrasonic surgical blade according to claim 1, characterized in that the length of the blade bar (1) is greater than or equal to 200mm and/or the cross-sectional diameter of the blade bar body (10) is 2-3 mm.

4. The ultrasonic surgical blade according to claim 2, wherein the blade bar (1) further comprises a connecting rod (13), the connecting rod (13) and the blade bar body (10) are cylindrical rods, and the first transition step (11) is of a truncated cone-shaped structure; the connecting rod (13) is connected with the cutter bar main body (10) through the first transition step (11), and the proximal end node (102) is positioned on the connecting rod (13);

the first transition step (11) comprises a first connecting end (111) and a first transition end (112), the first connecting end (111) and the first transition end (112) are of round end face structures, and the first connecting end (111) and the first transition end (112) are coaxially arranged; -the first transition end (112) has a smaller diameter than the first connection end (111);

The first transition step (11) is connected with the connecting rod (13) through the first connecting end (111), and the first transition step (11) is connected with the cutter bar main body (10) through the first transition end (112);

the diameter of the first transition end (112) is equal to the section diameter of the cutter bar main body (10), and the diameter of the first connecting end (111) is equal to the connecting rod (13); the diameter of the first connection end (111) is greater than 1.5 times the diameter of the first transition end (112).

5. The ultrasonic surgical blade according to claim 1, characterized in that the second transition step (12) is of a truncated cone-shaped structure, the blade bar (1) being connected to the blade head (2) via the second transition step (12);

the second transition step (12) is provided with a second connecting end (121) and a second transition end (122), the second connecting end (121) and the second transition end (122) are of round end face structures, and the second connecting end (121) and the second transition end (122) are coaxially arranged; -the second transition end (122) has a smaller diameter than the second connection end (121);

the second transition step (12) is connected with the cutter bar main body (10) through the second connecting end (121), and the second transition step (12) is connected with the cutter head (2) through the second transition end (122);

The diameter of the second connecting end (121) is equal to the diameter of the section of the cutter bar main body (10), and the diameter of the second connecting end (121) is 2-3 mm; the diameter of the second transition end (122) is 1 mm-2 mm.

6. The ultrasonic surgical blade according to claim 1, wherein the blade (2) comprises a blade body (20), a first cutting portion (21) and a second cutting portion (22), the first cutting portion (21) and the second cutting portion (22) being disposed on two opposite sides of the blade body (20), respectively; the thickness of the first cutting part (21) and the second cutting part (22) is gradually reduced along the direction from the proximal end to the distal end of the cutter head main body (20); the lengths of the first cutting part (21) and the second cutting part (22) are lambda/8-lambda/4.

7. The ultrasonic surgical blade according to claim 6, wherein the blade head (2) has an arc shape, the first cutting portion (21) has a convex arc structure, and the second cutting portion (22) has a concave arc structure; the radius of the second cutting part (22) is smaller than the radius of the first cutting part (21).

8. The ultrasonic surgical blade according to claim 7, wherein the radius of the convex arc-shaped structure of the first cutting portion (21) is in the range λ/2±5 mm.

9. The ultrasonic surgical blade according to claim 6, wherein the blade head (2) is straight, and the first cutting portion (21) and the second cutting portion (22) are both straight blade structures.

10. The ultrasonic surgical blade according to claim 6, wherein the lengths of the first cutting portion (21) and the second cutting portion (22) in the proximal-to-distal direction of the blade body (20) are 10mm to 17mm.

11. The ultrasonic surgical blade according to claim 6, wherein the blade (2) further comprises a third cutting portion (23), the third cutting portion (23) has a V-shaped structure, the third cutting portion (23) is disposed at a distal end of the blade body (20), and the third cutting portion (23) is disposed on a side of the blade body (20) where the first cutting portion (21) and the second cutting portion (22) are not disposed.

12. The ultrasonic surgical blade according to claim 11, wherein the length of the third cutting portion (23) is less than or equal to a preset length, which is 1/2 of the shorter of the first cutting portion (21) and the second cutting portion (22); the third cutting portion (23) is tapered in thickness in a proximal-to-distal direction.

13. The ultrasonic surgical blade of claim 12, wherein the V-shaped configuration comprises an included angle of 60 ° to 100 °.

14. Ultrasonic surgical blade according to claim 12 or 13, characterized in that the blade bar body (10) is provided with a cutting groove (100), the cutting groove (100) being arranged on the same side as the third cutting portion (23), the cutting groove (100) being arranged between the distal node (101) and the second transition step (12).

15. The ultrasonic surgical blade according to claim 14, wherein the distance from the proximal end of the slot (100) to the distal node (101) is 4-9 mm; the length of the cutting groove (100) is 2 mm-5 mm, and the depth of the cutting groove (100) is 0.15 mm-0.35 mm.

16. The ultrasonic surgical blade according to claim 2, wherein the blade bar (1) further comprises a plurality of flanges (14), the flanges (14) being sleeved on the blade bar (1); the flange (14) is arranged at a mounting node of the cutter bar (1), wherein the mounting node is other vibration nodes except the proximal node (102) on the cutter bar (1).

17. The ultrasonic surgical blade of claim 16, wherein the number of flanges (14) is greater than or equal to three, each flange (14) being disposed at the distal node (101) and at a mounting node spaced from the distal node (101) by λ/2 x N, the N being a positive integer.

18. An ultrasonic surgical knife bar characterized by comprising a knife bar body (10), a first transition step (11) and a second transition step (12), wherein:

the first transition step (11) is connected with the proximal end of the cutter bar main body (10), and the cross section diameter of the first transition step (11) is gradually reduced from the proximal end to the distal end;