Scalpel rod for ultrasonic scalpel, scalpel assembly, and ultrasonic scalpel

Abstract

The present disclosure relates to a scalpel rod for an ultrasonic scalpel, a scalpel assembly, and an ultrasonic scalpel. The scalpel rod comprises a rod body and a scalpel head. The rod body extends in a front-rear direction, and the scalpel head extends forward from the front end of the rod body. A flat blade is arranged on an outer peripheral portion of the scalpel head. The flat blade is a plane extending in the front-rear direction, and the plane is parallel to the axis of the rod body. By adjusting the size of the flat blade on the scalpel rod, the cutting speed and the hemostatic ability of the scalpel rod can be adjusted, so that the scalpel rod, as well as a scalpel assembly and an ultrasonic scalpel that have the scalpel rod, can meet surgeons' requirements for delicate operations during clinical use.

Description

Ultrasonic scalpel handle, blade assembly, and ultrasonic scalpel Technical Field

[0001] This disclosure relates to the field of medical devices, specifically to a blade holder for an ultrasonic scalpel, a blade assembly having the blade holder, and an ultrasonic scalpel. Background Technology

[0002] Ultrasonic scalpels are mainly used for surgical procedures such as cutting biological tissues and closing blood vessels. They are characterized by less bleeding, less damage to surrounding tissues, and faster postoperative recovery. When applied to human tissues, they perform cutting and coagulation functions, and are known as bloodless scalpels. They are now being used more and more widely in clinical surgery.

[0003] With the increasing clinical needs of doctors, there is a desire for ultrasonic scalpels for precise cutting, which can achieve rapid cutting, rapid coagulation, and a longer effective cutting length. However, the ultrasonic scalpels currently on the market usually have a wide blade structure, which limits the effective cutting length, and the cutting speed and coagulation ability cannot meet the clinical surgical needs of doctors. Summary of the Invention

[0004] The purpose of this disclosure is to provide an improved handle for an ultrasonic scalpel to address one or more problems of the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this disclosure is: a scalpel handle for an ultrasonic scalpel, the scalpel handle including a handle body and a blade head, the handle body extending in a front-rear direction, the blade head extending forward from the front end of the handle body, wherein a flat blade is provided on the outer periphery of the blade head, the flat blade being a plane extending in a front-rear direction, and the plane being parallel to the axis of the handle body.

[0006] In some embodiments, the blade includes a cutting section and a connecting section connected in a front-rear direction, the rear end of the connecting section is connected to the front end of the rod body, the rear end of the cutting section is connected to the front end of the connecting section, wherein the diameter of the connecting section is larger than the diameter of the cutting section, and the flat blade is entirely disposed on the outer periphery of the cutting section.

[0007] In some embodiments, the front end of the flat blade extends to the front end of the cutting segment, and the length of the flat blade is less than the length of the cutting segment.

[0008] In some embodiments, the length of the cutting segment is 24mm to 26mm, and the distance between the rear end of the flat blade and the front end of the blade shank is 15mm to 16mm.

[0009] In some embodiments, the cutting segment includes a straight rod segment and an arc-shaped rod segment connected in a front-to-back direction. The length extension direction of the straight rod segment is consistent with the length extension direction of the rod body. The arc-shaped rod segment extends forward and radially from the front end of the straight rod segment in an arc shape.

[0010] In some embodiments, the arc of the arc segment is 18° to 22°; and / or, the radius of the arc segment is 30mm to 40mm; and / or, the distance between the outermost front end of the arc segment and the axis of the rod body is 2mm to 2.5mm.

[0011] In some embodiments, the length of the arc-shaped rod segment is less than the length of the flat blade.

[0012] In some embodiments, the longitudinal section of the front end of the cutter head has an outer contour formed by an arc and a straight line connected end to end.

[0013] In some embodiments, the front part of the cutter head is provided with a groove extending in the front-rear direction. The groove and the flat blade are respectively located on opposite sides of the cutter head. The length of the groove is less than the length of the cutter head, and the front wall of the groove is spaced apart from the front end face of the cutter head.

[0014] In some embodiments, the groove is spherical, and the diameter of the spheres in the groove gradually increases from front to back. The groove has a smaller sphere at the front and a larger sphere at the rear. The radius of the smaller sphere is R1, 0.3mm≤R1≤0.6mm; and the radius of the larger sphere is R2, 0.5mm≤R2≤0.8mm.

[0015] In some embodiments, the diameter of the blade head is set to gradually decrease from back to front, and the width of the flat blade gradually decreases from back to front.

[0016] In some embodiments, the diameter of the front end of the cutter head is 0.7mm to 1.5mm, and the diameter of the rear end of the cutter head is 2mm to 2.5mm.

[0017] In some embodiments, the width of the front end of the flat blade is a, the width of the rear end of the flat blade is b, and the length of the flat blade is L, wherein 0.1mm≤a≤0.5mm, 0.2mm≤b≤0.7mm, and 16mm≤L≤20mm.

[0018] In some embodiments, the distance between the plane of the flat blade and the axis of the rod body is 0.8 mm to 1.3 mm.

[0019] In some embodiments, the cutter bar includes a rear bar segment, a main bar segment, and a front bar segment connected in a front-rear direction. The front bar segment is connected to the cutter head. The main bar segment includes a plurality of first bar segments and a plurality of second bar segments. The main bar segment is connected to the front bar segment and the rear bar segment through the first bar segments. A second bar segment is provided between any two adjacent first bar segments. The diameter of the first bar segment is larger than the diameter of the second bar segment.

[0020] Another object of this disclosure is to provide a cutting tool assembly for an ultrasonic scalpel, the cutting tool assembly having the ultrasonic scalpel handle as described above.

[0021] In some embodiments, the tool assembly further includes an inner tube, an outer tube, and a clamp. The outer tube is axially sleeved on the outside of the inner tube, and the tool shank is axially inserted in the inner tube. The clamp is movably disposed between the inner tube and the outer tube, and the clamp has an open state relative to the tool head and a closed state relative to the tool head. The flat cutting edge faces the clamp, and when the clamp is in the closed state, at least part of the clamp is in contact with the flat cutting edge.

[0022] Another object of this disclosure is to provide an ultrasonic scalpel that includes the ultrasonic scalpel handle as described above, or includes the blade assembly as described above.

[0023] Due to the application of the above technical solution, this disclosure has the following advantages compared with the prior art: The ultrasonic scalpel handle of this disclosure, as well as the cutting tool assembly and ultrasonic scalpel having the handle, wherein a flat blade is provided on the outer periphery of the blade head, and the flat blade is a plane whose extension direction is parallel to the axis of the handle. By adjusting the size of the flat blade on the handle, the cutting speed and coagulation ability of the handle can be adjusted, so that the handle, the cutting tool assembly having the handle, and the ultrasonic scalpel can meet the requirements of doctors for delicate surgery in clinical use. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0025] Figure 1 is a schematic diagram of the overall structure of the handle of an ultrasonic scalpel according to an embodiment of the present disclosure;

[0026] Figure 2 is a schematic diagram of the main structure of the ultrasonic scalpel handle shown in Figure 1;

[0027] Figure 3 is a bottom view of the handle of the ultrasonic scalpel shown in Figure 2.

[0028] Figure 4 is a three-dimensional schematic diagram of a portion of the structure in the tool holder shown in Figure 1;

[0029] Figure 5 is an enlarged schematic diagram of the P-section structure in Figure 3, and also a front view schematic diagram of a part of the tool holder structure in Figure 4;

[0030] Figure 6 is an enlarged schematic diagram of the cross-sectional structure along the M1-M1 direction in Figure 5;

[0031] Figure 7 is an enlarged schematic diagram of the cross-sectional structure along the M2-M2 direction in Figure 5;

[0032] Figure 8 is an enlarged schematic diagram of the cross-sectional structure along the M3-M3 direction in Figure 5;

[0033] Figure 9 is a schematic diagram based on Figure 5 with some additional dimensional parameters added;

[0034] Figure 10 is a top view of the structure shown in Figure 5;

[0035] Figure 11 is a schematic diagram of the structure from below in Figure 5;

[0036] Figure 12 is a front view schematic diagram of the blade assembly in an ultrasonic scalpel according to an embodiment of the present disclosure;

[0037] Figure 13 is a three-dimensional structural schematic diagram of the tool assembly in Figure 12;

[0038] The components are: 1. Tool holder; 2. Outer tube; 3. Inner tube; 4. Clamping device;

[0039] 10. Pole body; 101. Rear pole section; 102. Main pole section; 102a. First pole section; 102b. Second pole section; 103. Front pole section; 104. Connector;

[0040] 20. Cutting head; 201. Cutting section; 201a. Straight rod section; 201b. Curved rod section; 202. Connecting section; 203. Flat blade; 204. Groove; 204a. Smaller ball; 204b. Larger ball. Detailed Implementation

[0041] The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and preferred embodiments, so that the advantages and features of this disclosure can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments.

[0042] For ease of description, the anterior-posterior direction is defined by the anterior-posterior orientation observed by the operator when holding the ultrasonic scalpel. That is, the proximal end closer to the operator is posterior, and the distal end farther from the operator is anterior, as illustrated in Figures 2, 4, and 5. This definition of direction is merely for ease of description and simplification of this disclosure, and does not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of this disclosure.

[0043] Referring to Figures 1 to 11, an ultrasonic scalpel handle is provided, which is mounted on the handle of an ultrasonic scalpel and connected to an ultrasonic transducer to receive high-frequency ultrasonic vibrations generated by the ultrasonic transducer, thereby being used for tissue cutting or other surgical operations. The handle includes a shaft 10 and a blade head 20. The shaft 10 extends in a front-to-back direction, and the blade head 20 extends forward from the front end of the shaft 10. The shaft 10 is used to connect to the handle and the ultrasonic transducer, and the blade head 20 is used to contact biological tissue for surgical operations such as cutting.

[0044] On the handle of the ultrasonic scalpel, a flat blade 203 is provided on the outer periphery of the blade head 20. The flat blade 203 is a plane extending in the front-back direction, and the aforementioned plane of the flat blade 203 is parallel to the axis X of the handle 10.

[0045] Compared to existing scalpel handles of the same size, the scalpel handle with the flat blade 203 significantly improves the scalpel's hemostatic ability. Furthermore, the hemostatic ability increases with the increase of the flat blade's size (area), while the cutting speed decreases with the increase of the flat blade's size (area). Therefore, the flat blade 203 can adjust both the cutting speed and hemostatic ability of the scalpel. By rationally setting the size of the flat blade 203, a scalpel handle that meets both the required and expected cutting speed and hemostatic ability can be obtained, satisfying the clinical surgical requirements of doctors.

[0046] Referring to the accompanying drawings, in this embodiment, the blade 20 includes a cutting section 201 located at the front and a connecting section 202 connected to the cutting section 201 in the front-rear direction. The rear end of the connecting section 202 is connected to the front end of the rod 10, and the rear end of the cutting section 201 is connected to the front end of the connecting section 202. The diameter of the connecting section 202 is larger than the diameter of the cutting section 201. The cutting section 201 is configured to primarily contact tissue to perform surgical operations. The flat blade 203 is entirely located on the cutting section 201.

[0047] Specifically, the front end of the flat blade 203 extends to the front end of the cutting section 201, meaning the front edge of the flat blade 203 forms a ridge line at the front end of the cutter head 20, and the length of the flat blade 203 is less than the length of the cutting section 201. As shown in Figures 10 and 11, the length of the cutting section 201 is 24mm to 26mm, while the distance between the rear end of the flat blade 203 and the front end of the cutter shank 10 is 15mm to 16mm.

[0048] The cutting segment 201 specifically includes a straight rod segment 201a and an arc-shaped rod segment 201b connected in the front-to-back direction. The straight rod segment 201a extends in the same direction as the rod body 10. The arc-shaped rod segment 201b extends forward and radially from the front end of the straight rod segment 201a in an arc shape. The length of the arc-shaped rod segment 201b is less than the length of the flat blade 203. The main body shape of the straight rod segment 201a is conical, and the main body shape of the arc-shaped rod segment 201b is also a conical shape extending in an arc.

[0049] As shown in Figure 9, the arc A of the arc segment 201b is set to 18°~22°, the radius B of the arc segment 202b is set to 30mm~40mm, and the distance C between the outermost front end of the arc segment 202b and the axis of the rod 10 is set to 2mm~2.5mm.

[0050] In this embodiment, the diameter of the cutter head 20 gradually decreases from back to front, and the width of the flat cutting edge 203 also gradually decreases from back to front. The length of the flat cutting edge 203 is less than the length of the cutter head 20, and the front end of the flat cutting edge 203 extends to the front end of the cutter head 20. The cutter head 20 is solid in shape, and the outer contour of the longitudinal section of the front end of the cutter head 20 is formed by the connection of a large arc and a straight line end to end.

[0051] Referring to Figures 5 to 11, in a preferred configuration, the width of the front end of the flat blade 203 is a, the width of the rear end of the flat blade 203 is b, and the length of the flat blade 203 is L, wherein 0.1mm≤a≤0.5mm, 0.2mm≤b≤0.7mm, 16mm≤L≤20mm, and the distance between the plane of the flat blade 203 and the axis X of the rod 10 is set to 0.8mm~1.3mm; the diameter c of the front end of the cutter head 20 is set to 0.7mm~1.5mm, and the diameter d of the rear end of the cutter head 20 is set to 2mm~2.5mm.

[0052] The above-described design of the blade tip 20 allows for a longer length and a sharper tip, resulting in a longer effective cutting length, greater sharpness, and faster cutting speed. This ensures that the blade tip 20 maintains good cutting speed and hemostatic ability while also possessing a longer effective cutting length. Specifically, the very tip of the blade tip 20 has a diameter of approximately 1mm, while the effective length is generally over 16mm. This means the blade tip is sharper and the effective cutting length is longer, meeting the surgical requirements for rapid cutting and hemostatic action.

[0053] Referring to Figures 4 to 11, the front part of the cutter head 20 is also provided with a groove 204 extending in the front-rear direction. The length of the groove 204 is less than the length of the cutter head 20, and the front wall of the groove 204 is spaced apart from the front end face of the cutter head 20. That is, the groove 204 is located near the tip of the cutter head 20. At the same time, the groove 204 and the flat edge 203 are located on opposite sides of the cutter head 20. Specifically, the groove 204 is spherical, and its diameter gradually increases from front to back. The groove 204 has a smaller sphere 204a located at the front and a larger sphere 204b located at the rear. The radius of the smaller sphere 204a is R1, and the radius of the larger sphere 204b is R2, wherein: 0.3mm≤R1≤0.6mm, 0.5mm≤R2≤0.8mm. The groove 204 effectively increases the speed of back cutting tissue during cutting, and also increases the effective cutting length of the blade 20.

[0054] Referring to Figures 1 to 3, the cutter bar of this embodiment has a bar body 10 including a rear bar section 101, a main bar section 102 and a front bar section 103 connected in the front-to-back direction. The front bar section 103 is connected to the cutter head 20. A connector 104 is also connected to the rear of the rear bar section 201. The connector 104 is configured to connect to the transducer.

[0055] The main body segment 102 includes multiple first segments 102a and multiple second segments 102b. The main body segment 102 is connected to the front segment 103 and the rear segment 101 through the first segments 102a. A second segment 102b is provided between any two adjacent first segments 102a. The diameter of the first segment 102a is larger than the diameter of the second segment 102b, and a rounded chamfer is provided at the joint between them. By making the above design on the rod body 10, the distance from the position where the preset amplitude of the vibration is generated on the tool bar to the tip of the tool head 20 can be longer after the tool bar is connected to the transducer to receive high-frequency ultrasonic vibration.

[0056] Referring to Figures 12 and 13, which show partial structural diagrams of the cutting tool assembly in an ultrasonic scalpel, the cutting tool assembly includes the ultrasonic scalpel handle 1 as described above, as well as an outer tube 2, an inner tube 3, and a clamp 4. The outer tube 2 is axially sleeved on the outside of the inner tube 3, and the handle 1 is axially inserted into the inner tube 3, with its front cutting head 20 protruding outside the inner tube 3. The clamp 4 is movably disposed between the inner tube 3 and the outer tube 2, and the clamp 4 has an open state relative to the cutting head 20 and a closed state relative to the cutting head 20. The flat blade 203 faces the clamp 4, and when the clamp 4 is in the closed state, at least part of the clamp 4 is attached to the flat blade 203, forming a closure to clamp and cut the surgical site, or perform hemostasis, etc.

[0057] In summary, the ultrasonic scalpel handle of this embodiment, by providing a flat blade 203 parallel to the axis of the handle 201 on the outer circumferential surface of the blade head 20, and by rationally setting the dimensions of the flat blade 203, can achieve a handle that meets the requirements and expectations for both cutting speed and coagulation ability, thus satisfying the clinical surgical requirements of doctors. Simultaneously, the structural design of the blade head 20 makes its tip sharper, its effective cutting length longer, its cutting faster, its coagulation effect better, and its surgical operation easier.

[0058] The above embodiments are only for illustrating the technical concept and features of this disclosure, and are intended to enable those skilled in the art to understand the content of this disclosure and implement it accordingly. They should not be construed as limiting the scope of protection of this disclosure. All equivalent changes or modifications made in accordance with the spirit and essence of this disclosure should be included within the scope of protection of this disclosure.

[0059] Features of the embodiments of this disclosure are set forth in the following terms:

[0060] Clause 1. A scalpel handle for an ultrasonic surgical scalpel, the scalpel handle comprising a handle body and a blade head, the handle body extending in a front-rear direction, the blade head extending forward from the front end of the handle body, wherein a flat blade is provided on the outer periphery of the blade head, the flat blade being a plane extending in a front-rear direction, and the plane being parallel to the axis of the handle body.

[0061] Clause 2. The ultrasonic scalpel handle according to Clause 1, wherein the scalpel head includes a cutting section and a connecting section connected in a front-rear direction, the rear end of the connecting section is connected to the front end of the handle, the rear end of the cutting section is connected to the front end of the connecting section, wherein the diameter of the connecting section is larger than the diameter of the cutting section, and the flat blade is entirely disposed on the outer periphery of the cutting section.

[0062] Clause 3. The ultrasonic scalpel handle according to Clause 2, wherein the front end of the flat blade extends to the front end of the cutting section, and the length of the flat blade is less than the length of the cutting section.

[0063] Clause 4. The ultrasonic scalpel handle according to Clause 2, wherein the length of the cutting section is 24mm to 26mm, and the distance between the rear end of the flat blade and the front end of the handle is 15mm to 16mm.

[0064] Clause 5. The ultrasonic scalpel handle according to Clause 2, wherein the cutting section comprises a straight section and an arc-shaped section connected in the front-to-back direction, the length extension direction of the straight section being consistent with the length extension direction of the handle, and the arc-shaped section extending forward and radially from the front end of the straight section in an arc shape.

[0065] Clause 6. The ultrasonic scalpel handle according to Clause 5, wherein the arc of the arc segment is 18° to 22°; and / or, the radius of the arc segment is 30mm to 40mm; and / or, the distance between the outermost front end of the arc segment and the axis of the handle is 2mm to 2.5mm.

[0066] Clause 7. The length of the arc-shaped section of the ultrasonic scalpel handle as described in Clause 5 is less than the length of the flat blade.

[0067] Clause 8. The ultrasonic scalpel handle according to Clause 1, wherein the longitudinal section of the front end of the scalpel head has an outer contour formed by a superior arc and a straight line connected end to end.

[0068] Clause 9. The ultrasonic scalpel handle according to Clause 1, wherein the front part of the scalpel head is provided with a groove extending in the front-rear direction, the groove and the flat blade are respectively provided on opposite sides of the scalpel head, the length of the groove is less than the length of the scalpel head, and the front wall of the groove is spaced apart from the front end face of the scalpel head.

[0069] Clause 10. The ultrasonic scalpel handle according to Clause 9, wherein the groove is spherical and the diameter of the sphere in the groove gradually increases from front to back, wherein the groove has a smaller sphere at the front and a larger sphere at the rear, the radius of the smaller sphere being R1, 0.3mm≤R1≤0.6mm; and the radius of the larger sphere being R2, 0.5mm≤R2≤0.8mm.

[0070] Clause 11. The ultrasonic scalpel handle according to Clause 1, wherein the diameter of the blade head is gradually reduced from rear to front, and the width of the flat edge gradually reduces from rear to front.

[0071] Clause 12. The ultrasonic scalpel handle according to Clause 11, wherein the diameter of the front end of the scalpel head is 0.7 mm to 1.5 mm, and the diameter of the rear end of the scalpel head is 2 mm to 2.5 mm.

[0072] Clause 13. The blade of the ultrasonic scalpel according to Clause 11, wherein the width of the front end of the flat blade is a, the width of the rear end of the flat blade is b, and the length of the flat blade is L, wherein 0.1mm≤a≤0.5mm, 0.2mm≤b≤0.7mm, and 16mm≤L≤20mm.

[0073] Clause 14. The ultrasonic scalpel handle according to Clause 1, wherein the distance between the plane of the flat blade and the axis of the handle body is 0.8 mm to 1.3 mm.

[0074] Clause 15. The ultrasonic scalpel handle according to any of the preceding clauses, wherein the handle comprises a rear handle segment, a main handle segment, and a front handle segment connected in a front-to-back direction, the front handle segment being connected to the scalpel head, the main handle segment comprising a plurality of first handle segments and a plurality of second handle segments, the main handle segment being connected to the front handle segment and the rear handle segment via the first handle segments, and a second handle segment being provided between any two adjacent first handle segments, wherein the diameter of the first handle segment is larger than the diameter of the second handle segment.

[0075] Clause 16. An ultrasonic scalpel tool assembly having an ultrasonic scalpel handle as described in any one of Clauses 1 to 15.

[0076] Clause 17. The ultrasonic scalpel tool assembly according to Clause 16, the tool assembly further comprising an inner tube, an outer tube, and a clamp, the outer tube being axially sleeved outside the inner tube, the scalpel shaft being axially inserted in the inner tube, the clamp being movably disposed between the inner tube and the outer tube, and the clamp having an open state relative to the scalpel head and a closed state relative to the scalpel head, wherein the flat blade faces the clamp, and when the clamp is in the closed state, at least part of the clamp is in contact with the flat blade.

[0077] Clause 18. An ultrasonic scalpel comprising an ultrasonic scalpel handle as described in any of Clauses 1 to 15, or comprising a blade assembly as described in Clauses 16 or 17.

Claims

1. A blade holder for an ultrasonic surgical scalpel, characterized in that: The cutter bar comprises a bar body and a cutter head, the bar body extends in the front-rear direction, the cutter head extends forward from the front end of the bar body, wherein a flat blade is arranged on the outer side of the cutter head, the flat blade is a plane extending in the front-rear direction, and the plane is parallel to the axis of the bar body.

2. The handpiece of claim 1, wherein: The cutter head comprises a cutting section and a connecting section connected in the front-rear direction, the rear end of the connecting section is connected with the front end of the bar body, and the rear end of the cutting section is connected with the front end of the connecting section, wherein the diameter of the connecting section is larger than the diameter of the cutting section, and the flat blade is arranged on the outer side of the cutting section.

3. The handpiece of claim 2, wherein: The front end of the flat blade extends to the front end of the cutting section, and the length of the flat blade is smaller than the length of the cutting section.

4. The handpiece of claim 2, wherein: The length of the cutting section is 24mm-26mm, and the distance between the rear end of the flat blade and the front end of the cutter bar is 15mm-16mm.

5. The handpiece of claim 2, wherein: The cutting section comprises a straight rod section and an arc-shaped rod section connected in the front-rear direction, the length direction of the straight rod section is consistent with the length direction of the bar body, and the arc-shaped rod section extends forward and curves radially from the front end of the straight rod section.

6. The handpiece of claim 5, wherein: The curvature of the arc-shaped rod section is 18°-22°; and / or, the radius of the arc-shaped rod section is 30mm-40mm; and / or, the distance between the outer side of the front end of the arc-shaped rod section and the axis of the bar body is 2mm-2.5mm.

7. The handpiece of claim 5, wherein: The length of the arc-shaped rod section is smaller than the length of the flat blade.

8. The handpiece of claim 1, wherein: The longitudinal section of the front end of the cutter head has an outer contour formed by a convex arc and a straight line connected end to end.

9. The handpiece of claim 1, wherein: The front part of the cutter head is provided with a groove extending in the front-rear direction, the groove is arranged on different sides of the cutter head from the flat blade, the length of the groove is smaller than the length of the cutter head, and the front part of the groove is arranged with a distance between the groove wall and the front end face of the cutter head.

10. The handpiece of claim 9, wherein: The groove is spherical, and the spherical diameter of the groove is gradually increased from front to back, wherein the groove has a smaller sphere at the front part and a larger sphere at the rear part, the radius of the smaller sphere is R1, 0.3mm≤R1≤0.6mm; the radius of the larger sphere is R2, 0.5mm≤R2≤0.8mm.

11. The handpiece of claim 1, wherein: The diameter of the cutter head is gradually reduced from back to front, and the width of the flat blade is gradually reduced from back to front.

12. The handpiece of claim 11, wherein: The diameter of the front end of the cutter head is 0.7mm-1.5mm, and the diameter of the rear end of the cutter head is 2mm-2.5mm.

13. The handpiece of claim 11, wherein: The width of the front end of the flat blade is a, the width of the rear end of the flat blade is b, and the length of the flat blade is L, wherein 0.1mm≤a≤0.5mm, 0.2mm≤b≤0.7mm, and 16mm≤L≤20mm.

14. The handpiece of claim 1, wherein: The distance between the plane of the flat blade and the axis of the bar body is 0.8mm-1.3mm.

15. The handpiece of any one of claims 1 to 14, wherein: The blade bar comprises a rear bar section, a main body bar section and a front bar section which are connected in the front-rear direction, the front bar section is connected with the blade head, the main body bar section comprises a plurality of first bar sections and a plurality of second bar sections, the main body bar section is connected with the front bar section and the rear bar section through the first bar sections, and one second bar section is arranged between any two adjacent first bar sections, wherein the diameter of the first bar section is greater than the diameter of the second bar section.

16. A blade assembly for an ultrasonic surgical blade, characterized by: The tool assembly has the blade bar for ultrasonic surgical knives as claimed in any one of claims 1 to 15.

17. The ultrasonic surgical tool assembly of claim 16 wherein: The tool assembly further comprises an inner tube, an outer tube and a clamp, the outer tube is axially sleeved outside the inner tube, the blade bar is axially arranged in the inner tube, the clamp is movably arranged between the inner tube and the outer tube, and the clamp has an open state of being opened relative to the blade head and a closed state of being closed relative to the blade head, wherein the flat blade faces the clamp, and when the clamp is in the closed state, at least part of the clamp is attached to the flat blade.

18. An ultrasonic surgical knife characterized by: The tool assembly comprises the blade bar for ultrasonic surgical knives as claimed in any one of claims 1 to 15, or comprises the tool assembly as claimed in claim 16 or 17.

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