CN116392209A

CN116392209A - Ultrasonic guide rod, ultrasonic knife handle, ultrasonic knife and ultrasonic knife system

Info

Publication number: CN116392209A
Application number: CN202310566732.6A
Authority: CN
Inventors: 余海涛; 左鹏飞; 邓南方
Original assignee: Shenzhen Mindray Bio Medical Electronics Co Ltd; Wuhan Mindray Medical Technology Research Institute Co Ltd
Current assignee: Shenzhen Mindray Bio Medical Electronics Co Ltd; Wuhan Mindray Medical Technology Research Institute Co Ltd
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-07-07

Abstract

The embodiment of the application provides an ultrasonic guide rod, an ultrasonic knife handle, an ultrasonic knife and an ultrasonic knife system, which comprises a conductive rod and a knife head, wherein the knife head comprises a base part and a bent end part; the curved end portion includes a first curved end portion and a second curved end portion; in the X-Y plane, a first curved end portion is curved from a distal end portion of the base portion in a direction from the proximal end toward the distal end toward a first side near the central axis, an entirety of an extension tip of the first curved end portion extends across the central axis toward the first side, a second curved end portion is curved from an extension tip of the first curved end portion toward a second side near the central axis, an entirety of a distal end of the second curved end portion extends across the central axis toward the second side, and in a projection of the X-Z plane, a projection of a distal end face of the distal end side of the second curved end portion is at least partially outside a projection range of an outer peripheral surface of the base portion.

Description

Ultrasonic guide rod, ultrasonic knife handle, ultrasonic knife and ultrasonic knife system

Technical Field

The application relates to the technical field of medical equipment, in particular to an ultrasonic guide rod, an ultrasonic knife handle, an ultrasonic knife and an ultrasonic knife system.

Background

The ultrasonic knife is a surgical instrument for cutting and coagulating soft tissues, and has the advantages of tidy incision, hemostatic blocks, small thermal injury area, less smoke generation and the like. The working principle of the ultrasonic knife is approximately as follows: the transducer converts high-frequency current into ultrasonic vibration, the ultrasonic vibration is transmitted to the cutter head through the waveguide rod, the cutter head and the clamping assembly clamp living biological tissues, the ultrasonic vibration is acted on the living biological tissues, and the cutter head and the tissues are contacted and rubbed to generate mechanical cutting and blood coagulation effects.

The amplitude of the ultrasonic blade is maximum at the distal end of the blade, and the distance from the blade tip to the point where the amplitude is 50% of the maximum amplitude is typically at least 50% of the maximum amplitude, which is the effective length of the blade, and the effective cutting length is about 13mm for a cylindrical waveguide rod or a straight blade having a resonance frequency of about 55.5kHz and an amplitude of at least 55 micrometers.

In the related art, the single cutting length is shorter, and the cutting efficiency of the cutter head is lower.

Disclosure of Invention

In view of this, it is desirable to provide an ultrasonic guide rod, an ultrasonic knife handle, an ultrasonic knife, and an ultrasonic knife system that promote effective cutting length and better vibration mode stability.

An embodiment of the present application provides an ultrasonic guide bar, including:

a conductive rod;

a cutter head acoustically coupled to a distal end of the conductive rod, ultrasonic vibrations being transmitted to the cutter head via the conductive rod;

the tool bit includes a base and a curved end extending distally from the base; the curved end portion includes a tissue treatment surface having a surface for providing tissue clamping pressure support; the curved end portion includes a first curved end portion and a second curved end portion;

in the case of defining an X-axis coaxial with the central axis of the conductive rod, a Y-axis orthogonal to the X-axis, and a Z-axis orthogonal to the X-axis and orthogonal to the Y-axis,

in an X-Y plane defined by an X-axis and a Y-axis, the first curved end portion being curved in a direction from a proximal end to a distal end from a distal end portion of the base portion to a first side near the central axis, an entirety of an extension tip of the first curved end portion extending across the central axis toward the first side, the second curved end portion being curved in a direction from an extension tip of the first curved end portion to a second side near the central axis, a distal end of the second curved end portion extending across the central axis toward the second side;

In the projection of the Y-Z plane defined by the Y-axis and the Z-axis, at least a part of the projection of the distal end face of the distal end side of the second curved end portion is located outside the projection range of the outer peripheral surface of the base portion.

a conductive rod;

the tool bit includes a base and a curved end extending distally from the base; the curved end portion having a tissue treatment surface for providing tissue clamping pressure support; the tissue treatment surface defines a bending axis,

the bending axis comprises a first bending axis and a second bending axis;

in an X-Y plane defined by an X axis and a Y axis, the first bending axis is continuously bent from an intersecting position with the central axis to a direction close to a first side of the central axis from a proximal end side to a distal end side, the second bending axis is continuously bent from an extending end of the first bending axis to a direction close to a second side of the central axis, and a part of a distal end of the second bending axis is beyond the central axis toward the second side, and a distance between the end of the second bending axis and the central axis is not less than a distance between the base and the central axis.

a conductive rod;

the tool bit includes a base and a curved end extending distally from the base; the curved end portion having a tissue treatment surface for providing tissue clamping pressure support;

in an X-Y plane defined by an X axis and a Y axis, in a direction from a proximal end side to a distal end side, a concave side edge line and a convex side edge line of the curved end portion are continuously curved from the distal end portion of the base portion in a direction toward a first side close to the central axis and then continuously curved toward a second side close to the central axis, the concave side edge line having at least one point located on the first side of the central axis, a portion of a length of a distal end of the concave side edge line and a portion of a length of a distal end of the convex side edge line being located on the second side of the central axis;

the distal end of the concave side edge line is spaced from the central axis more than the outer peripheral surface of the base.

a conductive rod;

the first curved end portion extends from the base portion toward the distal end side to a first side of the central axis in a manner offset in a direction radially away from the central axis toward the first side, the central axis not passing through a cross-sectional interior of a distal-side tip of the first curved end portion;

the second curved end portion extends from a distal side tip of the first curved end portion toward the distal side to a second side of the central axis in a manner offset in a direction radially toward the central axis toward the second side, the central axis not passing through a tip face of the second curved end portion; wherein the second side is symmetrical to the first side based on the central axis;

The distal surface of the second curved end portion is at least partially spaced from the central axis by a distance not less than the distance of the outer peripheral surface of the base portion from the central axis.

The embodiment of the application provides an ultrasonic knife handle, including: a clamping assembly and an ultrasonic guide bar as described in any of the embodiments herein, the clamping assembly cooperating with the curved end portion to provide a tissue clamping force.

The embodiment of the application provides an ultrasonic knife, comprising: the ultrasonic knife handle of the ultrasonic knife handle is connected with the ultrasonic transducer.

An embodiment of the present application provides an ultrasonic blade system, including: the ultrasonic blade of any of the embodiments of the host and application, wherein the host is coupled to the ultrasonic transducer.

The first bending end portion of tool bit has experienced the bending of great range, the second bending end portion has also experienced the bending of great range to opposite direction, through twice bending, make the whole bending degree of tool bit great, make the bending end portion adopt the longitudinal vibration + transverse vibration cutting mode, the longitudinal vibration of bending end portion and transverse vibration all participate in the cutting promptly, at the middle part and the near-end of tool bit along length direction, can compensate the position of longitudinal vibration inadequately with transverse vibration, strengthen the amplitude of bending end portion at middle part to near-end position, make bending end portion also can participate in effective cutting at middle part to near-end position, thereby increase the single effective cutting length of tool bit, promote cutting efficiency.

The cutter head of the embodiment of the application is beneficial to the visual angle operation of doctors because the whole bending degree of the cutter head is larger.

The tool bit of this application embodiment is favorable to arranging the whole focus of crooked tip on the central axis or near the central axis, so, is favorable to keeping the vibration mode stability of tool bit, improves the stress distribution of tool bit, promotes the life of tool bit.

Drawings

FIG. 1 is a schematic view of a tool tip and clamping assembly according to one embodiment of the present application;

FIG. 2 is a schematic view of a cutter head according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 5 is a schematic cross-sectional view of the structure shown in FIG. 2;

FIG. 6 is a projection view of the structure of FIG. 2 taken perpendicular to the Z-axis;

FIG. 7 is a bottom view of FIG. 6;

FIG. 8 is a left side view of FIG. 7;

FIG. 9 is a rear view of FIG. 7;

FIG. 10 is a schematic view of an ultrasonic waveguide according to an embodiment of the present application;

FIG. 11 is a schematic view of an ultrasonic blade handle according to one embodiment of the present application;

FIG. 12 is a schematic view of an ultrasonic blade according to an embodiment of the present application;

fig. 13 is a schematic view of an ultrasonic blade system in accordance with an embodiment of the present application.

Description of the reference numerals

100-ultrasonic guide rod;

1-a conductive rod;

2-a cutter head; 21-a base;

22-bent ends; 221-a first curved end; 222-a second curved end; 22 a-tissue treatment surface; 22 b-a first back cut side; 22 c-a second back cut side; 22 d-first tissue side; 22 e-a second tissue side; 22 f-back cutting edge; 22 g-transition junction; 22 h-first side; 22 k-second side;

w-a central axis; w 1-bending axis; w 2-a first bending axis; w 3-a second bending axis; w 4-convex side edge line; w 5-concave side edge line; end face 22n; arcuate side 22n1; a flat end face 22n2;

300-a clamping assembly; 301-tissue pad;

1000-ultrasonic knife handle;

200-handle;

2000-transducers;

3000-host;

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

An ultrasonic blade system, referring to fig. 13, includes a main unit 3000 and an ultrasonic blade.

Referring to fig. 12, an ultrasonic blade according to an embodiment of the present application includes an ultrasonic transducer 2000 and an ultrasonic blade holder 1000, and a host 3000 is connected to the ultrasonic transducer 2000.

Referring to fig. 10 and 11, ultrasonic blade handle 1000 includes a clamping assembly 300, a handle 200, and an ultrasonic guide 100.

Referring to fig. 10, an embodiment of the present application provides an ultrasonic waveguide 100 including a conductive rod 1 and a cutter head 2, the cutter head 2 being acoustically coupled to a distal end of the conductive rod 1.

The handle 200 is connected to an ultrasonic transducer 2000.

The host 3000 provides the ultrasonic frequency electrical signals required by the ultrasonic blade.

The transducer 2000 is used to generate ultrasonic vibrations from ultrasonic frequency electric signals of the main body 3000 by means of piezoelectric ceramics or the like, and transmit the ultrasonic vibrations to the conductive rod 1.

The clamping assembly 300 may be connected to the handle 200 by a sleeve, within which the conductive rod 1 is threaded. The clamping assembly 300 cooperates with the tool bit 2 to clamp tissue.

Illustratively, referring to fig. 1, the side of the clamping assembly 300 facing the cutter head 2 is provided with a tissue pad 301, and the clamping assembly 300 clamps tissue through the tissue pad 301. Wherein the tissue pad 301 may be provided with an uneven surface to enhance clamping of tissue, for example, the tissue pad 301 may be provided with a saw tooth structure to increase friction between the cut tissue and the clamping arm to increase clamping force on the cut tissue.

The ultrasonic vibrations generated by the transducer 2000 are transmitted to the cutter head 2 via the conductive rod 1. The tool bit 2 generates mechanical oscillation under the action of ultrasonic wave, thereby cutting and coagulating biological tissues.

The shape of the waveguide rod is not limited as long as acoustic vibrations can be transmitted to the tool bit 2, for example, the waveguide rod may have a substantially uniform cross section, or the waveguide rod may be tapered at various portions or may be tapered along the entire length direction.

Referring to fig. 2, 3 and 4, the cutter head 2 includes a base 21 and a bent end 22 extending from the base 21 toward the distal end side; the curved end 22 has a tissue-treating surface 22a for providing tissue-clamping pressure support. Specifically, tissue treatment surface 22a is disposed on a surface of curved end 22 on a side facing clamping assembly 300.

Along the length direction of the curved end portion 22, the curved end portion 22 includes a first curved end portion 221 and a second curved end portion 222, and the second curved end portion 222 is disposed distal to the first curved end portion 221.

The bent end 22 may be an integrally formed structure or may be a split structure and fixedly connected together.

In the present embodiment, the bent end portion 22 is described as an integrally formed structure.

The curved end 22 may be made of any suitable material, such as a titanium alloy.

For convenience of description, referring to fig. 6, 7 and 8 in combination, the curved end 22 defines an X-axis, a Y-axis and a Z-axis, wherein the X-axis is coaxial with the central axis w of the conductive rod 1, the Y-axis is orthogonal to the X-axis, and the Z-axis is orthogonal to the X-axis and to the Y-axis, that is, the X-axis, the Y-axis and the Z-axis form a three-dimensional rectangular coordinate system.

Referring to fig. 6, in the X-Y plane defined by the X-axis and the Y-axis, the first curved end 221 is curved from the distal end of the base 21 in a direction toward the first side of the central axis w in a direction from the proximal end toward the distal end, i.e., the first curved end 221 is gradually deviated from the central axis w in a direction toward the first side as a whole. The contour lines of the first curved end 221 in the X-Y plane are curved together in the direction of the first side without local curves to the inner recess of the first curved end, avoiding stress concentration at the recess.

With continued reference to fig. 6, the entirety of the extended extremity of the first curved end 221 extends beyond the central axis w in a direction towards the first side, that is to say at least a portion of the length of the extended extremity of the first curved end 221 is located entirely on the first side of the central axis w. The location at the dashed box in fig. 6 is marked a, where a is the extension end of the first curved end 221, as can be seen from fig. 6, where a is located entirely on the first side of the central axis w.

With continued reference to fig. 6, the second curved end 222 is curved entirely from the extension end of the first curved end 221 in a direction toward the second side of the central axis w, and the entirety of the distal end of the second curved end 222 extends beyond the central axis w toward the second side. That is, at least a portion of the length of the extended tip of the second curved end 222 is entirely located on the second side of the central axis w.

Referring to fig. 8, in the projection of the Y-Z plane defined by the Y-axis and the Z-axis, the projection of the distal end face of the distal end side of the second curved end portion 222 is at least partially out of the projection range of the outer peripheral surface of the base portion 21. That is, the distal surface of the second curved end portion 222 not only extends beyond the central axis w, but also at least a portion of the distal surface extends further beyond the projected contour of the base portion 21 in the Y-Z plane. In fig. 8, the outline of the base 21 is circular, and a dotted circle in fig. 8 illustrates the projection outline of the outer peripheral surface of the base 21, the dotted circle and the inside of the dotted circle belong to the projection range, and the area radially outside the dotted circle belongs to the outside of the projection range. At least a portion of the distal face of the second curved end 222 is outside the dashed circle.

The outer peripheral surface of the base 21 is a substantially constant diameter cylindrical outer peripheral surface of the base 21 near one end of the bit.

In the related art, the cutting mode of the cutter head is longitudinal vibration cutting, the amplitude of the cutter head at the far end (cutter tip) is the largest, the longitudinal vibration is reduced in a trigonometric function curve from the far end to the near end of the cutter tip, and the amplitude of the cutter head at the middle part and the near end root along the length direction is smaller, so that the separation efficiency is low; in addition, the amplitude required for effective cutting of the ultrasonic blade head is at least 50% of the maximum amplitude, and the distance from the blade tip to the point where the amplitude is 50% becomes the effective length of the blade head, so that the effective clamping length of the ultrasonic blade is short, the tissue separation operation frequency in the operation is too high, and the operation time is long; furthermore, due to the short clamping length, the reliability of the coagulation of the ultrasonic blade is greatly reduced for blood vessels with diameters exceeding 5mm, and the ultrasonic blade cannot function for blood vessels with diameters exceeding 5 mm.

For the ultrasonic knife, the limit length of the knife head along the central axis is limited by factors such as wavelength, and the length of the knife head cannot be increased at will, and in addition, the stability and reliability of the vibration mode of the knife head restrict the design of the knife head.

According to the cutter head, the first bending end 221 of the cutter head 2 is subjected to bending of a larger amplitude, the second bending end 222 is also subjected to bending of a larger amplitude in the opposite direction, the whole bending degree of the cutter head 2 is larger through bending twice, the bending end 22 adopts a longitudinal vibration and transverse vibration cutting mode, namely longitudinal vibration and transverse vibration of the bending end 22 are both involved in cutting, the middle part and the near end of the cutter head in the length direction of the central axis can be made up for the position of insufficient longitudinal vibration by transverse vibration, the amplitude of the bending end 22 in the middle part to the near end part is enhanced, the bending end 22 can also participate in effective cutting in the middle part to the near end part, the single effective cutting length of the cutter head is increased, and the cutting efficiency is improved.

The cutter head of the embodiment of the application is very beneficial to the visual angle operation of doctors because the whole bending degree of the cutter head 2 is large.

In the related art, the tool bit is only once crooked, and the tool bit is crooked towards the same side of central axis gradually from the proximal end to the distal end promptly, leads to the whole center deviation central axis of tool bit farther, and the vibration mode stability of tool bit is relatively poor, and under operating condition, the vibration of tool bit produces great disturbance, influences the operation precision, still can cause the tool bit stress to distribute unevenly, easily takes place fatigue damage, reduces the life of cutter.

In the tool bit of the embodiment of the present application, in the X-Y plane, the whole center of gravity of the first curved end 221 is distributed on the first side of the central axis w, and since at least a portion of the distal end face of the second curved end 222 is located outside the projection range of the outer peripheral surface of the base, that is, the second curved end 222 has a longer curved length, the whole center of gravity of the second curved end 222 can be adjacent to the central axis w, and the matching of the curved shapes of the first curved end 221 and the second curved end 222 is beneficial to arranging the whole center of gravity of the curved end on the central axis w or adjacent to the central axis w, so that the stability of the vibration mode of the tool bit is beneficial to be maintained, the stress distribution of the tool bit is improved, and the service life of the tool bit is prolonged.

Illustratively, referring to fig. 6, the curvature of the first curved end 221 is greater than the curvature of the second curved end 222. That is, the bending radius of the first bending end 221 is smaller than that of the second bending end 222, i.e., the bending degree of the first bending end 221 is greater than that of the second bending end 222. In this way, the ratio of the transverse vibration of the first curved end portion 221 to the cutting can be increased, and the cutting performance of the first curved end portion 221 can be ensured.

Illustratively, referring to fig. 6, the length of the first curved end 221 along the central axis w is less than the length of the second curved end 222 along the central axis w. Specifically, the total length of the tool bit 2 along the central axis w is L, the length of the first curved end 221 along the central axis is L1, and the length of the second curved end 222 along the central axis is L2. Wherein the total length L of the tool bit 2 is the sum of the length of the first curved end 221 and the length of the second curved end 222, i.e. l=l1+l2. The ratio of the length to the total length of the first curved end 221 is smaller than the ratio of the length to the total length of the second curved end 222, i.e., (L1/L) < (L2/L).

In this embodiment, the second curved end portion 222 can be made to have a relatively long length while maintaining the same overall length of the cutter head 2, ensuring the cutting efficiency of the second curved end portion 222, while also facilitating the drawing together of the entire center of the curved end portion 22 toward the central axis w.

Illustratively, referring to fig. 6, the normal line of the distal end side end face of the bent end portion 22 (i.e., the distal end side end face of the second bent end portion 222) forms an angle β of 20 ° to 30 °, for example, 20 °, 23 °, 24 °, 25 °, 27 °, 29 °, 30 °, or the like with the X-axis. The range of angles is such that the ratio of the lateral displacement of the distal end of the second curved end 222 in the Y-axis direction to the longitudinal displacement in the X-axis direction is reasonable. The larger the value of the angle β, the larger the ratio of the lateral displacement in the Y-axis direction and the longitudinal displacement in the X-axis direction of the distal end portion of the second curved end portion 222, which affects the heating loss rate, the surgical accuracy, and the like of the curved end portion 22, and therefore, it is necessary to control the ratio within the above-described reasonable range.

For example, referring to fig. 2, 3, 4 and 8, the curved end 22 has a bottom edge along the Z-axis and on a side away from the tissue-treating surface 22a, the bottom edge including a back-cutting edge 22f, the back-cutting edge 22f extending to a distal surface on a distal side of the curved end 22. Illustratively, in a cross-section parallel to the conductive rod, the back cutting edge 22f is a single smooth curve.

Referring to fig. 7, in the X-Z plane defined by the X-axis and the Z-axis, in the proximal-to-distal direction, the distance between the bottom edge of the curved end portion 22 and the central axis w increases continuously and decreases continuously, and the distance between the bottom edge of the curved end portion and the central axis w is the largest at the start position B of the back cutting edge 22 f; at the extension end of the back cutting edge 22f, the distance from the bottom edge of the bent end portion to the central axis w is minimized, so that the punching, fine manipulation function of the distal end portion of the bent end portion 22 can be ensured.

That is, the thickness in the Z-axis direction at the start position B of the back cutting edge 22f is maximized in the X-Z plane, reducing the probability of the tool bit being deformed by the holding force, thereby securing the bending rigidity and stability of the whole bent end portion 22. In addition, the distance between the bottom edge of the curved end 22 and the central axis w gradually decreases from the starting position of the back cutting edge 22f to the direction of the base 21, so that the bottom edge of the curved end 22 is conveniently and gradually approaching to the base 21, smooth transition connection between the bottom edge of the curved end 22 and the base 21 is conveniently realized, and the occurrence of a large size difference at the connection position of the two parts to generate an obvious step-shaped structure is avoided. It will be appreciated that if a significant step-like structure is created at the surface of the junction of the base 21 and the bent end 22, significant stress concentrations can result, increasing the risk of breakage of the bent end 22.

Illustratively, the starting position of the back cutting edge 22f is located at the bottom edge of the first curved end 221 in the Z-axis direction and away from the tissue-treating surface 22a, that is, the junction a of the first curved end 221 and the second curved end 222 is located on the side of the starting position B of the back cutting edge 22f away from the base 21. In this embodiment, the back cutting edge 22f may promote bending stiffness of the first curved end 221.

Illustratively, referring to fig. 6, the junction a of the first curved end 221 and the second curved end 222 is the location of greatest degree of curvature, and referring to fig. 7, in the X-Z plane defined by the X-axis and the Z-axis, the thickness of the curved end 22 in the direction of the Z-axis reaches a maximum at or near the location of greatest degree of curvature in the direction from the proximal end to the distal end.

The stress concentration phenomenon of the bent end 22 is most remarkable at the position with the largest bending degree, and is also a weak link of the stress of the bent end 22. Therefore, in this embodiment, the portion with the greatest bending degree has a larger thickness, and the probability of deformation of the cutter head due to the holding force is reduced, so that the bending rigidity and stability of the whole bending end portion 22 are ensured.

The thickness of the bent end 22 in the Z-axis direction reaches a maximum value at or near the portion where the bending degree is greatest, including both cases.

First kind: the thickness of the bent end portion 22 in the Z-axis direction reaches a maximum at a portion where the degree of bending is greatest.

Second kind: the thickness of the bent end portion 22 in the Z-axis direction reaches a maximum in the vicinity of the portion where the degree of bending is greatest, and in this case, the vicinity of the portion where the degree of bending is greatest may be in the vicinity of the connection point a of the first bent end portion 221 and the second bent end portion 222 on the proximal side or in the vicinity of the connection point a of the first bent end portion 221 and the second bent end portion 222 on the distal side.

Wherein, the vicinity of the junction a of the first curved end 221 and the second curved end 222 may be defined as: in the X-Z plane, the length of the connection a between the back cutting edge 22f and the first curved end 221 and the second curved end 222 in the X-axis is defined as a reference length, the connection a between the first curved end 221 and the second curved end 222 is defined as a reference position, and the range of the reference length radiating from the reference position to the distal end side and the proximal end side, respectively, is defined as the vicinity of the connection between the first curved end 221 and the second curved end 222.

For example, referring to fig. 3 and 4, the curved end 22 is in the Z-axis direction and is far away from the transition 22g of the tissue treatment surface 22a, and the starting position of the back cutting edge 22f is smoothly transited to the base 21 through the transition 22g, so that the stress condition at the connection position of the curved end 22 and the base 21 can be improved, and the stress concentration can be reduced. The transitional connection portion 22g is a rounded surface, and the structural strength of the proximal end portion at the bottom side of the bent end portion 22 is reduced to reduce stress concentration.

For example, referring to fig. 3 and 4, the convex side of the curved end 22 has a first back-cut side 22b and the concave side of the curved end 22 has a second back-cut side 22c, the first back-cut side 22b and the second back-cut side 22c intersecting, the intersecting line defining a back-cut edge 22f, the back-cut edge 22f extending to the end face of the curved end 22, i.e., the first back-cut side 22b and the second back-cut side 22c also extending to the end of the curved end 22. In this manner, the back cutting edge 22f may be referred to as a single curve configuration, reducing complexity.

Illustratively, referring to fig. 6, the first back-cut side 22b and the second back-cut side 22c are symmetrically disposed, thus facilitating a centered symmetrical design of the back-cut edge 22f and maintaining cutting stability.

Illustratively, referring to fig. 5, the curved end portion 22 has a cross-sectional shape of a polygon having the same number of sides from the start position of the back cutting edge 22f to the extension end of the back cutting edge 22 f. That is, the cross-sectional shape of the curved end portion 22 remains substantially the same from the start position of the back cutting edge 22f to the extension end of the back cutting edge 22 f.

The number of sides of the polygon is not limited, and may be, for example, pentagonal, hexagonal, heptagonal, octagonal, or the like.

Illustratively, in some embodiments, the number of sides of the polygon is an odd number not less than 5, e.g., an odd number of 5, 7, 9, etc. The polygon with odd number of sides is convenient for realizing the symmetrical design of the polygon under the condition that the back cutting edge 22f presents a single curve.

Illustratively, the cross-sectional area of the curved end portion 22 continuously decreases from the start position of the back cutting edge 22f to the extension end of the back cutting edge 22 f. That is, the cross-sectional area will not be abrupt, and the abrupt location will not be too stress concentrated.

Illustratively, referring to FIG. 5, the cross-sectional shape of the curved end 22 is symmetrically disposed about the Z-axis. Since the bent end portion 22 is bent, the symmetry center line of each cross-sectional shape of the bent end portion 22 is parallel to the Z-axis. Specifically, a perpendicular bisector of the tissue treatment surface 22a passes through the back cutting edge 22f and is parallel to the Z axis, and the cross-sectional shape of the curved end portion 22 is symmetrical about the perpendicular bisector. The tissue treatment surface 22a and the back cutting edge 22f are symmetrically arranged on the left side and the right side (namely, the opposite sides along the Y-axis direction) in the middle, the left side and the right side are uniformly stressed during cutting, deviation between a cutting route and actual requirements is not easy to generate, cutting is more accurate, and meanwhile, vibration stability is more facilitated due to the arrangement in the middle.

Illustratively, the centers of the cross-sections of the curved end portions 22 are each projected on the central axis w in an X-Z plane defined by the X-axis and the Z-axis. That is, the projection view of the center of each cross section in the X-Z plane is located on the central axis w. In this way, along the Z-axis direction, the whole center of the curved end 22 can be guaranteed to be close to the central axis w, and in the design process of the curved end 22, only the centroid distribution in the X-Y plane needs to be guaranteed, so that the centroids of the parts located on two opposite sides of the central axis along the Y-axis direction are located on the central axis w or are arranged as close to the central axis w as possible, thus, the design and manufacturing difficulty can be reduced, and the design and manufacturing cost can be reduced.

Illustratively, referring to FIG. 6, the width of tissue treatment surface 22a increases continuously from base 21 to the distal end and then decreases continuously. That is, tissue treatment surface 22a is configured with a large middle section and a small middle section. During coagulation, the blood vessel is clamped by the middle section, so that the stability of pressure is ensured, the coagulation effect is improved, and during cutting, even if the blood vessel is clamped completely, the cutting efficiency can be ensured through superposition of longitudinal vibration and transverse vibration.

Illustratively, referring to fig. 6, the location of greatest width of tissue treatment surface 22a is located between the starting position of back cutting edge 22f and the extended extremity of first curved end 221. The extended tip of the first curved end 221 refers to the junction of the first curved end 221 and the second curved end 222. In this way, it is ensured that the portion between the starting position of the back cutting edge 22f and the extending end of the first curved end portion 221 can better participate in the effective cutting.

Illustratively, referring to FIG. 6, the convex side of the curved end 22 has a first tissue side 22d intersecting a first side of the tissue-treating surface 22a, the concave side has a second tissue side 22e intersecting a second side of the tissue-treating surface 22a, and the first and

second tissue sides

22d, 22e extend distally on either side of the tissue-treating surface 22 a. Specifically, the intersection of the first tissue side 22d and the tissue treatment surface 22a is a first contour line, the intersection of the second tissue side 22e and the tissue treatment surface 22a is a second contour line, the first contour line and the second contour line define the contour of the tissue treatment surface 22a, and the shape, width and area of the tissue treatment surface 22a are adjusted by adjusting the first tissue side 22d and the second tissue side 22 e.

Illustratively, the first tissue side 22d and the second tissue side 22e are symmetrically disposed. In this manner, a centered symmetrical design of tissue treatment surface 22a is facilitated, and cutting stability is facilitated to be maintained.

Illustratively, referring to fig. 5, the convex side of the curved end 22 has a first side 22h and the concave side has a second side 22k, the first side 22h and the second side 22k extending distally from the proximal end of the curved end 22, the first side 22h intersecting the first tissue side 22d and defining a convex side edge line w4 (see fig. 6), the second side 22k intersecting the second tissue side 22e and defining a concave side edge line w5 (see fig. 6).

An ultrasonic guide bar 100 according to an embodiment of the present application, referring to fig. 6, includes a conductive bar 1 and a cutter head 2.

The cutter head 2 is acoustically coupled to the distal end of the conductive rod 1, and ultrasonic vibrations are transmitted to the cutter head 2 via the conductive rod 1;

the cutter head 2 includes a base 21 and a bent end 22 extending from the base 21 toward the distal end side; the curved end 22 has a tissue-treating surface 22a for providing tissue-clamping pressure support; tissue treatment surface 22a defines a bending axis w1.

Specifically, the edge contour line of the convex side of the tissue treatment surface 22a is a first contour line, the edge contour line of the concave side of the tissue treatment surface 22a is a second contour line, and the line connecting the midpoints between the first contour line and the second contour line forms the bending axis w1. More specifically, a line connecting midpoints of the tissue processing surface 22a in the width direction is a bending axis w1.

The bending axis w1 includes a first bending axis w2 and a second bending axis w3 in the length direction.

For convenience of description, the bent end 22 defines an X axis, which is coaxial with the central axis w of the conductive rod 1, a Y axis, which is orthogonal to the X axis, and a Z axis, which is orthogonal to the X axis and to the Y axis, that is, the X axis, the Y axis, and the Z axis constitute a three-dimensional rectangular coordinate system.

In the X-Y plane defined by the X-axis and the Y-axis, the first bending axis w2 continuously bends from the intersection with the central axis w toward the first side near the central axis w from the proximal side toward the distal side, that is, any portion of the first bending axis w2 does not locally arch toward the second side. The second bending axis w3 is continuously bent from the extending end of the first bending axis w2 toward the second side near the central axis w, and any portion of the second bending axis w3 does not locally arch toward the first side.

Referring to FIG. 6, a distance d2 between the end of the second bending axis w3 and the central axis w is not smaller than a distance d1 between the outer peripheral surface of the base 21 and the central axis w, i.e., d2.ltoreq.d1.

The curved shape of the curved axis w1 of the tissue treatment surface 22a in the X-Y plane substantially represents the overall curved shape of the curved end portion 22.

In this embodiment, the portion of the curved end 22 within the length range of the first curved axis w2 is referred to as a first curved end 221, and the portion of the curved end 22 within the length range of the second curved axis w3 is referred to as a second curved end 222.

The cutter head of this embodiment, first crooked axis w2 has experienced the bending of great range, second crooked axis w3 has also experienced the bending of great range to opposite direction, through twice bending, make the whole crooked degree of cutter head 2 great, make crooked tip 22 adopt the longitudinal vibration + transverse vibration cutting mode, longitudinal vibration and transverse vibration of crooked tip 22 all participate in the cutting promptly, at the middle part and the near-end of cutter head along length direction, can compensate the position of longitudinal vibration inadequately with transverse vibration, strengthen the amplitude of crooked tip 22 at middle part to near-end position, make crooked tip 22 also can participate in effective cutting at middle part to near-end position, thereby increase the single effective cutting length of cutter head, promote cutting efficiency.

In the tool bit of this application embodiment, in the X-Y plane, the whole focus of first crooked tip 221 distributes in the first side of central axis w, and the whole focus of second crooked tip 222 is adjacent central axis w, through the matching of the crooked shape of first crooked tip 221 and second crooked tip 222, is favorable to arranging the whole focus of crooked tip on central axis w or be adjacent central axis w, so, is favorable to keeping the mode stability of tool bit, improves the stress distribution of tool bit, promotes the life of tool bit.

Illustratively, the curvature of the first bending axis w2 is greater than the curvature of the second bending axis w 3. That is, the bending radius of the first bending axis w2 is smaller than the bending radius of the second bending axis w3, i.e. the bending degree of the first bending axis w2 is larger than the bending degree of the second bending axis w 3. In this way, the ratio of the lateral vibration of the first curved end portion 221 participating in cutting can be increased, and the cutting performance of the first curved end portion 221 can be improved.

The cross-sectional shape of the curved end 22, the design of the back cutting edge 22f, and the like may be the same as those of the ultrasonic guide 100 in any of the above embodiments, and will not be described again.

In the embodiment in which the cross section of the curved end portion 22 is formed symmetrically with respect to the Z axis, the curved shape of the back cutting edge 22f coincides with a part of the curved axis w1 in the X-Y plane, except that the length of the curved axis w1 is greater than the length of the back cutting edge 22 f. The ultrasonic guide 100 in this embodiment may adopt any of the structures of the ultrasonic guide 100 in the above embodiments, and will not be described here.

The present embodiment provides an ultrasonic guide bar 100 including a conductive bar 1 and a cutter head 2, the cutter head 2 being acoustically coupled to a distal end of the conductive bar 1, ultrasonic vibrations being transmitted to the cutter head 2 via the conductive bar 1. The tool bit 2 generates mechanical oscillation under the action of ultrasonic wave, thereby cutting and coagulating biological tissues.

The cutter head 2 includes a base 21 and a bent end 22 extending from the base 21 toward the distal end side; the curved end 22 has a tissue-treating surface 22a for providing tissue-clamping pressure support.

In the X-Y plane defined by the X-axis and the Y-axis, from the proximal end side toward the distal end side, the concave side edge line w5 and the convex side edge line w4 of the curved end portion 22 are continuously curved from the distal end portion of the base portion 21 in a direction toward the first side of the central axis w and then continuously curved toward the second side of the central axis w, the concave side edge line w5 has at least one point located on the first side of the central axis w, and a part of the length of the distal end of the concave side edge line w5 and a part of the length of the distal end of the convex side edge line w4 are located on the second side of the central axis w. Referring to fig. 6, a distance d3 between the end of the concave side edge line w5 and the central axis w is greater than a distance d1 between the outer peripheral surface of the base 21 and the central axis w, i.e., d3> d1. In other words, in the projection of the Y-Z plane, the end of the concave side edge line w5 is located outside the projection range of the base 21.

In this embodiment, the concave side edge line w5 and the convex side edge line w4 define an outline of the curved end portion 22 in the X-Y plane, and therefore, the concave side edge line w5 and the convex side edge line w4 are cooperatively curved. That is, the entirety of the bent end portion 22 is continuously bent from the distal end portion of the base portion 21 toward the first side near the central axis w, and a portion within this length range is referred to as a first bent end portion 221; and then continuously bent in a direction toward the second side of the central axis w, a portion within this length range is referred to as a second bent end 222.

In the embodiment of the present application, the bending end 22 is bent to a greater extent in two opposite directions, so that the overall bending degree of the cutter head 2 is greater, so that the bending end 22 adopts a longitudinal vibration+transverse vibration cutting mode, that is, the longitudinal vibration and the transverse vibration of the bending end 22 participate in cutting, and the transverse vibration is used for compensating the position of insufficient longitudinal vibration, so as to improve the stability of the cutting speed, enhance the amplitude of the part of the first bending end 221 of the bending end 22, improve the cutting efficiency, and improve the single effective cutting length of the cutter head 2; in addition, the curved cutter head 2 is also advantageous for the doctor's view operation.

It should be noted that vibration stability is also a very important reference factor for the cutter head 2. In the X-Y plane, if the center of gravity of the shaving head 2 deviates far from the center axis w, the vibration stability of the shaving head 2 is poor and even easily broken, and thus, in the prior art, the design of the shaving head 2 tends to be small in bending amplitude.

The cutter head of this application embodiment, crooked tip 22 is through twice great degree crooked for the whole crooked degree of cutter head 2 is great, makes crooked tip 22 adopt the longitudinal vibration + transverse vibration cutting mode, and the longitudinal vibration of crooked tip 22 and transverse vibration all participate in the cutting promptly, at the middle part and the near-end of cutter head along length direction, can compensate the position of longitudinal vibration inadequately with transverse vibration, strengthen the amplitude of crooked tip 22 at middle part to near-end position, make crooked tip 22 also can participate in effective cutting at middle part to near-end position, thereby increase the single effective cutting length of cutter head, promote cutting efficiency.

The tool bit of this application embodiment, because the direction of second bending portion towards the second side surpasss the farther distance of central axis w, consequently, be favorable to arranging the whole focus of bending tip on central axis w or be close to central axis w, so, be favorable to keeping the vibration mode stability of tool bit, improve the stress distribution of tool bit, promote the life of tool bit.

The curved end 22 includes a first curved end 221 and a second curved end 222, the second curved end 222 being disposed distally of the first curved end 221.

The first curved end 221 extends from the base 21 to the first side of the central axis w toward the distal end side in a manner offset in a direction away from the central axis w toward the first side in the radial direction, and the central axis w does not pass through the inside of the cross section of the distal-side tip of the first curved end 221.

Wherein the central axis w does not pass through the inside of the cross section of the distal-side tip of the first curved end portion 221, including two cases, the first: the central axis w is tangential to the contour line of the cross section of the distal-side tip of the first curved end 221; second kind: the central axis w is completely separated from the contour line of the cross section of the distal end of the first curved end 221, and the cross section of the distal end of the first curved end 221 is completely located on the first side of the central axis w.

The second curved end portion 222 extends from the distal-side tip of the first curved end portion 221 toward the distal side to the second side of the central axis w in such a manner as to be offset in a direction radially toward the central axis toward the second side, that is, the distal end of the second curved end portion 222 passes over the central axis w. The central axis w does not pass through the distal face of the second curved end 222; that is, the distal surface of the second curved end 222 is entirely located on the second side of the central axis w.

Wherein the second side is symmetrical to the first side based on the central axis. Specifically, in the above-described X-Y plane, the first side and the second side are located on opposite sides of the central axis.

In this embodiment, at the junction of the curved end portion 22 and the base portion 21, the central axis w is located inside the curved end portion 22, in the direction from the base portion 21 toward the distal end face, the central axis w passes out from the concave side surface of the curved end portion 22 for the first time, passes into the inside of the curved end portion 22 from the concave side surface of the curved end portion 22, and passes out from the convex side surface of the distal end of the curved end portion 22. That is, the central axis w generally undergoes two passes out of the curved end 22 and one passes into the interior of the curved end 22.

The distal end face of the second curved end portion 222 is at least partially spaced from the central axis w by a distance not less than the distance of the outer peripheral surface of the base 21 from the central axis w. That is, the tip of the second curved end portion 222 extends a greater distance beyond the central axis w.

According to the cutter head provided by the embodiment of the application, the first bending end 221 is subjected to bending of a larger amplitude, the second bending end 222 is also subjected to bending of a larger amplitude in the opposite direction, and the whole bending degree of the cutter head 2 is larger through bending twice, so that the bending end 22 adopts a longitudinal vibration and transverse vibration cutting mode, namely, longitudinal vibration and transverse vibration of the bending end 22 are both involved in cutting, the middle part and the near end of the cutter head in the length direction can be made up by transverse vibration at the position of insufficient longitudinal vibration, the amplitude of the bending end 22 in the middle part to the near end part is enhanced, and the bending end 22 can also participate in effective cutting in the middle part to the near end part, so that the single effective cutting length of the cutter head is increased, and the cutting efficiency is improved.

Illustratively, at least half of the distal end face of the second curved end portion 222 is spaced from the central axis w by a distance not less than the distance of the outer peripheral surface of the base 21 from the central axis w. In this manner, the distal end of the second curved end 222 is generally farther beyond the central axis w, facilitating placement of the general center of gravity of the curved end on or adjacent the central axis w.

Illustratively, referring to fig. 8, the distal end face 22n includes a flat end face 22n2 and an arcuate side face 22n1, the arcuate side face 22n1 gradually shrinking from the outer peripheral surface of the distal end of the second curved end portion 222, the flat end face 22n2 being connected to an end of the arcuate side face 22n1 remote from the second curved end portion 222, wherein any point on the flat end face 22n2 is spaced from the central axis by a distance greater than the outer peripheral surface of the base 21 is spaced from the central axis w. Specifically, in the Y-Z plane, the dotted circle is the projection contour of the outer peripheral surface of the base 21, and the flat end face 22n2 is located entirely outside the projection range of the outer peripheral surface of the base 221, i.e., the flat end face 22n2 is located entirely radially outside the dotted circle.

For example, with the direction in which the tissue-treating surface 22a is used to cooperatively clamp tissue being the Z-axis, the Z-axis is perpendicular to and passes through the central axis w, and the cross-sectional shape of the curved end portion 22 is symmetrically arranged about the Z-axis.

For example, with the direction in which the tissue-treating surface 22a is used to cooperatively clamp tissue as the Z-axis, the centers of the cross-sections of the curved end portions 22 are each projected on the central axis w in a plane defined by the central axis w and the Z-axis.

In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ultrasonic waveguide, comprising:

a conductive rod;

in an X-Y plane defined by an X-axis and a Y-axis, the first curved end portion being curved in a direction from a proximal end to a distal end from a distal end portion of the base portion to a first side near the central axis, an entirety of an extension tip of the first curved end portion extending across the central axis toward the first side, the second curved end portion being curved in a direction from an extension tip of the first curved end portion to a second side near the central axis, an entirety of a distal end of the second curved end portion extending across the central axis toward the second side;

2. The ultrasonic guide bar of claim 1, wherein at least half of the projection of the tip face is located outside the projection range of the outer peripheral surface of the base in an X-Y plane projection defined by an X-axis and a Y-axis.

3. The ultrasonic waveguide of claim 1, wherein the first curved end portion has a curvature that is greater than a curvature of the second curved end portion.

4. The ultrasonic waveguide of claim 1, wherein a length of the first curved end along the central axis is less than a length of the second curved end along the central axis.

5. The ultrasonic guide bar according to claim 1, wherein a normal line of a distal surface of a distal end side of the bent end portion forms an angle of 20 ° to 30 ° with an X-axis.

6. The ultrasonic waveguide of claim 1, wherein the junction of the first curved end portion and the second curved end portion is a location of greatest degree of curvature, and the thickness of the curved end portion along the radial direction of the conductive rod in the direction from the proximal end to the distal end in the X-Z plane defined by the X-axis and the Z-axis reaches a maximum at or near the location of greatest degree of curvature.

7. The ultrasonic waveguide of claim 1, wherein the curved end portion has a bottom edge along the Z-axis direction and on a side remote from the tissue-treating surface, the bottom edge including a back cutting edge extending to a distal end surface of the curved end portion on a distal side thereof,

the distance between the bottom edge of the bending end part and the central axis increases continuously and then decreases continuously from the proximal end to the distal end; and a bottom edge of the curved end portion is at a maximum distance from the central axis at a start position of the back cutting edge, and at a minimum distance from the central axis at an extension end of the back cutting edge.

8. The ultrasonic guide bar of claim 1, wherein the curved end portion has a back cutting edge and a transition point along a Z-axis direction on a side away from the tissue treatment surface, and a starting position of the back cutting edge is smoothly transitioned to the base portion through the transition point.

9. The ultrasonic waveguide of claim 1, wherein the curved end portion has a back cutting edge along the Z-axis direction on a side remote from the tissue-treating surface, the back cutting edge extending to a distal face on a distal side of the curved end portion.

10. The ultrasonic guide bar according to claim 9, wherein the cross section of the curved end portion at any two places from the start position of the back cutting edge to the extension end of the back cutting edge has a polygonal shape with the same number of sides, and the number of sides of the polygonal shape is an odd number not less than 5.

11. The ultrasonic waveguide of claim 1, wherein the curved end portion has a back cutting edge along the Z-axis direction on a side remote from the tissue-treating surface, the back cutting edge extending to a distal end of the curved end portion, the cross-sectional area of the curved end portion continuously decreasing from a start position of the back cutting edge to an extension end of the back cutting edge.

12. The ultrasonic waveguide of claim 1, wherein the cross-sectional shape of the curved end portion is symmetrically disposed about the Z-axis.

13. The ultrasonic guide bar of claim 1, wherein the centers of the cross-sections of the curved end portions are each projected on the central axis in an X-Z plane defined by an X-axis and a Z-axis.

14. The ultrasonic waveguide of claim 1, wherein the tissue treatment surface increases in width from the base portion to the distal portion and then decreases in width.

15. The ultrasonic waveguide of claim 14, wherein the curved end portion has a back cutting edge along the Z-axis and on a side away from the tissue-treating surface, the location of greatest tissue-treating surface width being located between the start of the back cutting edge and the extended extremity of the first curved end portion.

16. The ultrasonic waveguide of claim 1, wherein the convex side of the curved end portion has a first back-cut side and the concave side of the curved end portion has a second back-cut side, the first back-cut side and the second back-cut side intersecting, the intersecting line defining a back-cut edge, the back-cut edge extending to a distal end of the curved end portion; the first back cutting side face and the second back cutting side face are symmetrically arranged.

17. The ultrasonic waveguide of claim 1, wherein the convex side of the curved end portion has a first tissue side intersecting a first side of the tissue-treating surface, the concave side has a second tissue side intersecting a second side of the tissue-treating surface, the first and second tissue sides extending distally on either side of the tissue-treating surface, the first and second tissue sides being symmetrically disposed.

18. An ultrasonic waveguide, comprising:

a conductive rod;

the bending axis comprises a first bending axis and a second bending axis;

in an X-Y plane defined by an X axis and a Y axis, the first bending axis is continuously bent from an intersecting position with the central axis to a direction near a first side of the central axis from a proximal end side to a distal end side, the second bending axis is continuously bent from an extending end of the first bending axis to a direction near a second side of the central axis, and a part of a distal end of the second bending axis is beyond the central axis toward the second side, and a distance between the end of the second bending axis and the central axis is not less than a distance between an outer peripheral surface of the base and the central axis.

19. The ultrasonic waveguide of claim 18, wherein the first bending axis has a curvature that is greater than a curvature of the second bending axis.

20. The ultrasonic waveguide of claim 18, wherein the cross-sectional shape of the curved end portion is symmetrically disposed about the Z-axis.

21. The ultrasonic guide bar of claim 18, wherein the centers of the cross-sections of the curved end portions are each projected on the central axis in an X-Z plane defined by an X-axis and a Z-axis.

22. An ultrasonic waveguide, comprising:

a conductive rod;

in an X-Y plane defined by an X axis and a Y axis, from a proximal end side to a distal end side, a concave side edge line and a convex side edge line of the curved end portion are continuously curved from the distal end portion of the base portion in a direction toward a first side near the center axis and then continuously curved toward a second side near the center axis, the concave side edge line has at least one point located on the first side of the center axis, a part of a length of a distal end of the concave side edge line and a part of a length of a distal end of the convex side edge line are located on the second side of the center axis,

23. The ultrasonic waveguide of claim 21, wherein the cross-sectional shape of the curved end portion is symmetrically disposed about the Z-axis.

24. The ultrasonic guide bar of claim 21, wherein the centers of the cross-sections of the curved end portions are each projected on the central axis in an X-Z plane defined by an X-axis and a Z-axis.

25. The ultrasonic waveguide of any one of claims 1-24, wherein the tissue-treating surface is configured to cooperatively clamp tissue in a direction parallel to the Z-axis.

26. An ultrasonic waveguide, comprising:

a conductive rod;

the first curved end portion extends from the base portion toward the distal end side to a first side of the central axis in a manner offset in a direction radially away from the central axis of the conductive rod toward the first side, the central axis not passing through the inside of a cross section of the distal-side tip of the first curved end portion;

The second curved end portion extends from a distal side tip of the first curved end portion toward the distal side to a second side of the central axis in a manner offset toward the second side in a radial direction near the central axis, the central axis not passing through a tip face of the second curved end portion; wherein the second side is symmetrical to the first side based on the central axis;

27. The ultrasonic waveguide of claim 26, wherein at least half of the distal face of the second curved end portion is spaced from the central axis no less than the outer peripheral surface of the base portion.

28. The ultrasonic waveguide of claim 26, wherein the distal surface includes a planar end surface and an arcuate side surface that tapers from the outer peripheral surface of the distal end of the second curved end portion, the planar end surface being connected to an end of the arcuate side surface distal from the second curved end portion, wherein any point on the planar end surface is spaced from the central axis a greater distance than the outer peripheral surface of the base portion.

29. The ultrasonic waveguide of claim 26, wherein the direction in which the tissue-treating surface is configured to cooperatively clamp tissue is a Z-axis, the Z-axis being perpendicular to and passing through the central axis, the cross-sectional shape of the curved end portion being symmetrically disposed about the Z-axis.

30. The ultrasonic guide bar of claim 26, wherein the center of the cross-section of the curved end portions in a plane defined by the center axis and the Z-axis is projected on the center axis with the direction in which the tissue-treating surface is used to cooperatively clamp tissue as the Z-axis.

31. An ultrasonic blade handle, comprising:

a clamping assembly and the ultrasonic guide bar of any one of claims 1-30, the clamping assembly cooperating with the curved end portion to provide a tissue clamping force.

32. An ultrasonic blade, comprising:

an ultrasonic transducer and the ultrasonic blade handle of claim 31, the handle of the ultrasonic blade handle being connected to the ultrasonic transducer.

33. An ultrasonic blade system, comprising:

a host computer, and the ultrasonic blade of claim 32, the host computer being connected to the ultrasonic transducer.