CN113813019B

CN113813019B - Ultrasonic surgical instrument

Info

Publication number: CN113813019B
Application number: CN202110826213.XA
Authority: CN
Inventors: 冯庆宇; 毛胜尧; 田浚宸; 江志鸿
Original assignee: Qingdao Jianxin Medical Technology Co ltd
Current assignee: Qingdao Jianxin Medical Technology Co ltd; Shanghai Yichao Medical Devices Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2023-07-21
Anticipated expiration: 2041-07-21
Also published as: CN113813019A

Abstract

The present disclosure provides an ultrasonic surgical instrument comprising a cannula assembly, a blade, a jaw, and a tissue pad having a first surface and a second surface opposite the first surface; the first surface of the tissue pad is disposed facing the cutter head; the first surface of the tissue pad is of non-planar design having a first portion distal to and proximal to the cannula assembly in an axial direction along the cutting head, a second portion and a third portion; wherein the average thickness of the second portion is minimal. The present disclosure helps achieve one of the following effects: better tissue guiding function, avoiding the influence of falling off of tissues in operation on the progress of the operation and avoiding misoperation in the operation.

Description

Ultrasonic surgical instrument

Technical Field

The present disclosure relates to an ultrasonic medical instrument, and more particularly, to an ultrasonic surgical instrument.

Background

With the development of medical technology, surgery has increasingly appeared in a diversified manner, and ultrasonic surgical instruments are often used in surgery to perform operations of cutting and coagulating various tissues. Because the ultrasonic surgical instrument converts electric energy into mechanical energy, integrates cutting, coagulation, grasping and separation, has the advantages of high cutting speed, good hemostatic effect and simple operation, the ultrasonic surgical instrument is increasingly applied to various endoscopic operations, such as laparoscopic, prostatectomy, cystoscope, hysteroscope and the like.

In the prior art, ultrasonic surgical instruments generally include a main body, a transducer coupled to the main body, an operating handle, a blade assembly coupled to the handle, and the like. The tool bit assembly, in turn, includes a cannula assembly, a shaft (horn or waveguide) and a jaw actuator including a stationary head assembly (typically the distal portion of the shaft is referred to as the tool bit) of an ultrasonic surgical instrument capable of providing ultrasonic energy, and a clamping arm that rotates relative to the tool bit. The prior art clamp arm surface typically has a tissue pad with a planar surface, and the living tissue is cut by manipulating the handle to bring the clamp arm with the tissue pad toward and close the ultrasonic surgical instrument head. In the process of closing the jaws, as the tissue pad is of a planar structure, when the tissue is extruded by the cutter head, the tissue, especially the blood vessel, slides far away, and even the range of the tissue and the blood vessel sliding out of the cutter head is possibly existed, so that the cutting difficulty is increased, and even ineffective cutting is formed.

To solve the above problems, those skilled in the art have explored the design of the section of the tissue pad to have a zigzag structure with gradually increasing zigzag shape from the proximal end to the distal end, and increasing the grasping force to the tissue by the higher zigzag portion of the distal end. The tissue pad has improved grasping strength for fascia, blood vessels and other structures with larger toughness and strength, but when facing soft tissue parts, the tissue can not be prevented from falling off and slipping in the jaw closing process. Furthermore, because the improved tissue pad is in approximately linear contact with the blade, good results are often not achieved in hemostatic procedures.

To solve the above problems, those skilled in the art have also explored forming the side edges of the cutter head into an arc-shaped structure, but a good effect still cannot be achieved in the hemostasis operation. It is therefore desirable to retrofit existing clamping arms, tissue pads to achieve clamping of soft tissue.

Aiming at the technical problems, the novel special-shaped tissue pad is designed, the shape of the tissue pad is improved, and especially the surgical instrument can have good technical effects of cutting, stopping bleeding and preventing tissue from falling off by the cooperation of the cutter head and the tissue pad, so that the surgical instrument has a wide medical application prospect.

Disclosure of Invention

A brief summary of the disclosure is provided below to provide a basic understanding of some aspects of the disclosure. It should be understood that this summary is not an exhaustive overview of the disclosure. It is not intended to identify key or critical elements of the disclosure or to delineate the scope of the disclosure. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

An ultrasonic surgical instrument provided according to the present disclosure includes a cannula assembly including an inner tube and an outer tube, a blade, a jaw, and a tissue pad; the tissue pad has a first surface and a second surface opposite the first surface; the first surface of the tissue pad is disposed facing the cutter head; the first surface of the tissue pad is non-planar and has a first portion, a second portion and a third portion along the axial direction of the tool bit, distal to and proximal to the cannula assembly; wherein the average thickness of the second portion along a perpendicular direction from the first surface to the second surface is minimal.

Further, wherein the maximum thickness in the first portion is greater than or equal to the maximum thickness in the third portion.

Further, wherein the sum of the projected lengths of the first and second portions along the axial direction of the cutter head is 1/5-1/3 of the projected length of the tissue pad along the axial direction of the cutter head.

Further, the non-planar surface is a cambered surface.

Further, at least one of the intersecting lines of the section of the tissue pad along the axial direction of the vertical cutter head and the first surface in the first part, the second part and the third part is concave curve morphology.

Further, a cross section of the tissue pad along the axial direction of the cutter head is in a U-shaped shape with an intersecting line of the first surface in the first part, the second part and the third part, so that the first surface has a U-shaped groove shape extending along the axial direction of the cutter head.

Further, wherein roughening or raised placement is performed on the first surface of the tissue pad.

Further, the roughening treatment or the protrusions are arranged at least in the contact area between the first surface and the surface of the tool bit, and the protrusions are one or more of saw-tooth-shaped, cubic-block-shaped, continuous step-shaped, inverted hook-shaped and rib-shaped teeth.

Further, wherein the height of the protrusions provided at the first and third portions is higher than the height of the protrusions provided at the second portion; or the bulges around the first surface are arranged to be denser than the middle of the first surface; or the first and third portions are constructed of a material that is less deformable than the second portion; or the material around the first surface is made of a material which is less deformable than the middle of the first surface.

Further, wherein the tissue pad is provided in the form of a single piece, multiple pieces along the bit axis or multiple pieces perpendicular to the bit axis.

Further, wherein a height difference between a highest point of the first surface of the tissue pad and a lowest point of the first surface is 1mm-2mm.

Further, wherein the ratio of the thickness between the lowest point of the first surface and the second surface to the thickness between the highest point of the first surface and the second surface is no more than 80%.

Further, wherein the blade has a tissue cutting surface facing the tissue pad, the tissue cutting surface of the blade is configured to have a shape that is adapted to the first surface of the tissue pad so that no gaps occur upon contact. Aspects of the present disclosure can help achieve at least one of the following effects: the device can effectively prevent tissue and blood vessels from slipping, further can prevent axial and transverse slipping, improves clamping effect, improves accuracy of surgical operation, and realizes convenience of the surgical operation.

Drawings

The above and other objects, features and advantages of the present disclosure will be more readily appreciated by reference to the following description of the specific details of the disclosure taken in conjunction with the accompanying drawings. The drawings are only for the purpose of illustrating the principles of the present disclosure. The dimensions and relative positioning of the elements in the figures are not necessarily drawn to scale.

FIGS. 1-5 show schematic diagrams according to a first embodiment;

FIGS. 6-7 show schematic diagrams according to a second embodiment;

fig. 8 shows a schematic diagram according to a third embodiment;

fig. 9-12 show schematic diagrams according to a fourth embodiment;

fig. 13-14 show schematic diagrams according to a fifth embodiment.

Detailed Description

Exemplary disclosure of the present disclosure will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an implementation of the present disclosure are described in the specification. However, it will be appreciated that numerous implementation-specific decisions may be made in the development of any such actual implementation of the present disclosure, in order to achieve the developer's specific goals, and that these decisions may vary from one implementation to another.

It is also noted herein that, in order to avoid obscuring the present disclosure with unnecessary details, only instrument structures closely related to the solution according to the present disclosure are shown in the drawings, while other details not greatly related to the present disclosure are omitted.

It is to be understood that the present disclosure is not limited to the described embodiments due to the following description with reference to the drawings. Herein, features between different embodiments may be substituted or borrowed where possible, and one or more features may be omitted in one embodiment.

First embodiment

Referring to fig. 1-5, wherein like numerals indicate like elements, fig. 1-5 illustrate a first embodiment of an ultrasonic surgical instrument of the present disclosure.

The ultrasonic surgical instrument head includes a cannula assembly, a blade 100, a jaw 200, and a tissue pad 300. Wherein the sleeve assembly at least comprises an inner tube 400 and an outer tube 500, wherein the inner tube 400 is installed inside the outer tube 500 and can move axially relatively, the tool bit 100 is located inside the inner tube 400 and can vibrate axially and ultrasonically relatively to the inner tube 400, the jaw 200 is hinged at the front ends of the outer tube 500 and the inner tube 400 respectively, and when a trigger (not shown) of the handle of the ultrasonic surgical instrument is pressed, the inner tube 400 moves backward and drives the jaw 200 to close. The tissue pad 300 is mounted on the upper surface of the jaw 200, and the tissue pad 300 has a first surface and a second surface opposite to the first surface, wherein the first surface is a contact surface for contacting tissue when clamped, and the second surface is fixedly combined with the jaw 200. The tool bit 100 is connected with an ultrasonic transducer (not shown) through a tool bar (also called a waveguide bar) integrally formed with the tool bit 100, so that the tool bit 100 can be driven to vibrate ultrasonically under the action of the ultrasonic transducer, and operations such as cutting and hemostasis of tissues are completed.

As shown in fig. 2-4, wherein the tissue pad 300 is mounted on a surface of the jaw 200 opposite the blade 100, wherein a first surface of the tissue pad 300 faces the blade 100. The first surface of the tissue pad 300 has a non-planar shape, and is divided into a first portion L1, a second portion L2 and a third portion L3 from far to near according to a far-near relation with the position of the sleeve assembly in the axial direction of the cutter head 100; the average thickness LH2 of the second portion along a perpendicular direction from the first surface to the second surface is smaller than the average thickness LH2 of the first portion in the direction and the average thickness LH3 of the third portion in the direction.

Illustratively, the non-planar shape is a non-planar shape having an arc-shaped curved surface along the axial direction of the tool bit 100, which has an arc shape with both high ends and a concave middle.

It will be appreciated that the maximum thickness of the first portion of the tissue pad 300 may be further set to be greater than or equal to the maximum thickness of the third portion of the tissue pad 300 as shown in fig. 3-4.

Further, the lengths of the projections of the first, second and third portions in the axial direction of the cutter head may be equal or different. By means of the design, on the one hand, the clamping effect can be better improved, and the accuracy of a surgical operation can be improved, and on the other hand, the total length of the first part and the second part is controlled within 1/3 of the length of the first part and the second part, which is close to the distal end of the cutter head, so that tissues can be effectively limited to a position which is closer to the distal end of the cutter head, and the optimal cutting effect can be ensured.

It will be appreciated that because the first surface of the tissue pad 300 is an arcuate surface, contact between the blade head 100 and the first surface of the tissue pad 300 will leave a gap between the blade head 100 and the tissue pad 300 due to the presence of the medial undercut of the tissue pad 300 when the jaws 200 are fully closed. In order to ensure a good cutting effect of the cutting head 100, as shown in fig. 5, a height difference between the highest point of the first surface and the lowest point of the first surface of the tissue pad 300 is 1-2mm, so that on one hand, a holding strength between the cutting head and the tissue pad is ensured, on the other hand, a guiding effect of the tissue pad on the tissue is improved, and the tissue is more easily positioned in the second portion L2. Further to ensure the strength and durability of the tissue pad 300, the ratio of the thickness h1 between the lowest point of the first surface and the second surface to the thickness h2 between the highest point of the first surface and the second surface is preferably not more than 80%, and more preferably the ratio is in the range of 50% -70%.

It will be appreciated that the first surface of the tissue pad 300 may be further roughened or provided with protrusions, exemplary shapes of which may be saw-tooth, discrete square, continuous stepped, inverted hook, ribbed teeth, etc.

It will further be appreciated that the protrusions of the first surface of the tissue pad 300 may also be arranged such that the protrusions at both ends have a higher height than the protrusions in the middle.

It will further be appreciated that the protrusions around the first surface of the tissue pad 300 may also be positioned more densely and/or higher than the protrusions in the middle.

It is further understood that the tissue pad may be an entire monolithic form of tissue pad, or the tissue pad may be a plurality of discrete tissue pads along the bit axis, or a plurality of discrete tissue pads perpendicular to the bit axis.

It is further understood that the material of the first portion of the tissue pad may be constructed of a material that is less deformable than the material of the third portion of the tissue pad.

By arranging the first surface of the tissue pad, when tissue is clamped, the ends at the two ends exert a guiding effect on the tissue, so that the tissue is extruded in the middle concave part, thereby avoiding the falling off of the tissue in operation, further affecting the progress of the operation and even causing misoperation.

Second embodiment

Fig. 6-7 illustrate a second embodiment of an ultrasonic surgical instrument of the present disclosure. The second embodiment differs from the first embodiment in that the shape of the first surface of the tissue pad perpendicular to the axial direction of the cutting head 100 is further modified on the basis of the tissue pad design of the first embodiment.

Fig. 6 is a top view of the ultrasonic surgical instrument, taken along with fig. 6 along the axial direction of the blade, from proximal to distal relative to the inner tube 400, with three different positions A-A, B-B, C-C selected to intercept a section of the associated tissue pad to further illustrate the tissue pad design.

As shown in fig. 7, at the locations A-A, B-B, C-C, the first surface of the tissue pad may be disposed in a planar arrangement, which, as seen in its cross-section, all exhibit a rectilinear topography.

It will be appreciated that the first surface of the tissue pad may be provided with protrusions about its periphery which are raised relative to the central portion of the tissue pad, and that the protrusions may be shaped as saw tooth triangles, cube-like blocks, continuous steps, inverted hooks, rib-like teeth, etc. as previously described. Illustratively, the difference in height between the peripheral protrusions and the protrusions of the central portion is between 1-2 mm.

It will further be appreciated that the periphery of the first surface of the tissue pad may be roughened or otherwise formed from a material that is less deformable than the material of the center of the first surface of the tissue pad.

And then based on the first surface of the tissue pad and the arc-shaped curved surface with a concave radian in the axial direction of the cutter head, the tissue pad is matched with the bulges, the roughening or the arrangement of the surrounding materials when necessary, so that tissues are extruded to the middle part of the jaw when in use, and the tissue is prevented from slipping.

Third embodiment

Fig. 8 illustrates a third embodiment of an ultrasonic surgical instrument of the present disclosure. The third embodiment differs from the second embodiment in that the morphology of the intersection line of the tissue pad along the axial direction of the cutter head and the first surface in the first, second and third portions is further improved on the basis of the tissue pad design of the second embodiment.

Referring to the second embodiment, which corresponds to the top view of the ultrasonic surgical instrument shown in fig. 6, three different positions A-A, B-B, C-C are selected in conjunction with fig. 6, from near to far relative to the cannula assembly, along the axial direction a1 of the tool head 100, to further illustrate the tissue pad design by taking cross-sections of the relevant tissue pad.

Alternatively, as shown in fig. 8, at the positions A-A, B-B, C-C, the cross section of the tissue pad 300 along the perpendicular cutter axis and the intersection of the first surface in the first, second and third portions are all concave curve shapes.

It will be appreciated that the intersection of the tissue pad 300 along the cross-section perpendicular to the axial direction of the tool bit with the first surface in the first, second and third portions may also be configured to have a curved profile with a concave arc shape.

It will be appreciated that the first surface of the tissue pad 300 may be provided with protrusions about its periphery that are raised relative to the central portion of the tissue pad, and that the protrusions may be shaped as saw tooth triangles, cube-like blocks, continuous steps, inverted hooks, rib-like teeth, etc., as previously described.

It will further be appreciated that the periphery of the first surface of the tissue pad 300 may be roughened or otherwise formed from a material that is less deformable than the material of the center of the first surface of the tissue pad.

Further, based on the curved surface of the first surface of the tissue pad 300, not only has a concave arc shape in the axial direction parallel to the cutter head 100, but also has a concave arc shape in the axial direction perpendicular to the cutter head 100 (i.e. the first surface of the tissue pad forms a spoon-shaped surface), and the protrusions, roughening or the surrounding materials are matched as necessary, so that the tissue is extruded toward the middle of the jaw during use, and the tissue is prevented from slipping.

Fourth embodiment

Fig. 9-12 illustrate a fourth embodiment of an ultrasonic surgical instrument of the present disclosure. The fourth embodiment differs from the three previous embodiments in that the tissue pad is further modified.

On the basis of the first to third embodiments, the first surface of the tissue pad 300 may be provided with upwardly protruding guide arms 301 at the first and second ends of the tissue pad along the axial direction of the cutter head, such that the tissue pad 300 is formed with a groove 302 in the middle along the axial direction of the cutter head, i.e. the tissue pad assumes a U-shape when seen in the direction perpendicular to the axial direction of the cutter head.

When the tissue pad 300 is adopted, when the jaw is closed, the first surface of the cutter head facing the tissue pad can be positioned in the U-shaped groove 302 of the tissue pad to form clearance fit, so that the clamping contact area of the cutter head 100 and the tissue pad 300 is larger, better operation effect is obtained when hemostasis or vascular cutting is carried out, and meanwhile, the U-shaped groove surrounds the cutter head tissue cutting surface, so that the clamping effect on the tissue is better, and the left-right sliding of the tissue in the radial direction is prevented.

It will further be appreciated that teeth 303 formed by ribs may also be spaced within the U-shaped recess. The provision of teeth 303 allows for better friction with the tissue during clamping, thereby preventing tissue from slipping.

Fifth embodiment

Fig. 13-14 illustrate a fifth embodiment of an ultrasonic surgical instrument of the present disclosure. The fifth embodiment differs from the first through fourth embodiments described above in that the tool tip of the ultrasonic surgical instrument is further modified.

Fig. 13 is a front view of the ultrasonic surgical instrument, as can be seen from fig. 9, the blade 100 of the ultrasonic surgical instrument has a tissue cutting surface facing the tissue pad 300, the tissue cutting surface of the blade 100 is designed to be non-planar 101, the non-planar 101 is adapted to the shape of the first surface of the tissue pad 300 such that when the jaws 200 are fully closed, the first surface of the blade 100 and the first surface of the tissue pad 300 are tightly closed at the contacted portion without gaps. Thereby more tightly clamping and cutting the tissue when in use. Illustratively, the non-planar shape is an arc.

The present disclosure has been described in connection with specific embodiments, but it should be apparent to those skilled in the art that the description is intended to be exemplary, and not limiting, of the scope of the disclosure. Various modifications and alterations of this disclosure may be made by those skilled in the art in light of the spirit and principles of this disclosure, and such modifications and alterations are also within the scope of this disclosure.

Claims

1. An ultrasonic surgical instrument comprises a sleeve component, a cutter head, a jaw and a tissue pad,

the sleeve assembly comprises an inner tube and an outer tube;

the tissue pad is arranged on the upper surface of the jaw and is provided with a first surface and a second surface opposite to the first surface; the first surface of the tissue pad is disposed facing the cutter head;

the first surface of the tissue pad is non-planar and has a first portion, a second portion and a third portion which are distal and proximal relative to the cannula assembly along the axial direction of the cutting head, wherein the second portion has a minimum average thickness along the vertical direction from the first surface to the second surface;

wherein the sum of the projected lengths of the first and second portions along the axial direction of the cutter head is within 1/3 of the projected length of the tissue pad in the axial direction of the cutter head.

2. The ultrasonic surgical instrument of claim 1 wherein the maximum thickness in the first portion is greater than or equal to the maximum thickness in the third portion.

3. The ultrasonic surgical device of any of claims 1-2, wherein the sum of the projected lengths of said first and second portions along the axial direction of said blade is 1/5-1/3 of the projected length of said tissue pad along the axial direction of said blade.

4. The ultrasonic surgical instrument of claim 1 wherein said non-planar surface is a cambered surface.

5. The ultrasonic surgical device of any of claims 1-2, 4, wherein at least one of the intersection of the tissue pad with the first surface in the first, second, and third portions along a cross-section perpendicular to the blade axis is a concave curvilinear topography.

6. The ultrasonic surgical device of any one of claims 1-2, 4, wherein a cross-section of said tissue pad along a direction perpendicular to the axial direction of the blade intersects said first surface in said first, second, and third portions in a U-shaped configuration, such that said first surface has a U-shaped slot shape extending along the axial direction of the blade.

7. The ultrasonic surgical device of any one of claims 1-2, 4, wherein a roughening treatment or raised arrangement is performed on the first surface of the tissue pad.

8. The ultrasonic surgical device of claim 7, wherein said roughening or protrusions are provided on at least the first surface in contact with said blade surface, said protrusions being one or a combination of more of saw tooth, cube-like, continuous stepped, inverted hook-like, ribbed teeth.

9. The ultrasonic surgical device of claim 7, wherein the protrusions provided at the first and third portions have a greater height than the protrusions provided at the second portion;

or the bulges around the first surface are arranged to be denser than the middle of the first surface;

or the first and third portions are constructed of a material that is less deformable than the second portion;

or the material around the first surface is made of a material which is less deformable than the middle of the first surface.

10. The ultrasonic surgical device of any one of claims 1-2, 4, 8-9, wherein said tissue pad is provided in the form of a single piece, multiple pieces along the blade axis, or multiple pieces perpendicular to the blade axis.

11. The ultrasonic surgical device of any one of claims 1-2, 4, 8-9, wherein the difference in height between the highest point of the first surface of the tissue pad and the lowest point of the first surface is 1mm-2mm.

12. The ultrasonic surgical instrument of any one of claims 1-2, 4, 8-9, wherein the ratio of the thickness between the lowest point of the first surface and the second surface to the thickness between the highest point of the first surface and the second surface is no greater than 80%.

13. The ultrasonic surgical device of any one of claims 1-2, 4, 8-9, wherein the blade has a tissue cutting surface facing the tissue pad, the tissue cutting surface of the blade being configured to have a shape that conforms to the first surface of the tissue pad so that no gaps occur upon contact.