CN113813019A

CN113813019A - Ultrasonic surgical instrument

Info

Publication number: CN113813019A
Application number: CN202110826213.XA
Authority: CN
Inventors: 冯庆宇; 毛胜尧; 田浚宸; 江志鸿
Original assignee: Shanghai Yichao Medical Devices 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: 2021-12-21
Anticipated expiration: 2041-07-21
Also published as: CN113813019B

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 cutting head; the first surface of the tissue pad is of a non-planar design and has a first portion, a second portion and a third portion which are arranged from far to near relative to the sleeve assembly along the axial direction of the cutter head; wherein the average thickness of the second portion is minimal. The present disclosure helps to achieve one of the following effects: better tissue guiding function, avoids the tissue from falling off in operation to influence the progress of the operation, and avoids 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, surgical operations are becoming more diversified, and ultrasonic surgical instruments are often used in surgical operations to cut and coagulate various tissues. Because the ultrasonic surgical instrument converts electric energy into mechanical energy, integrates cutting, coagulation, grasping and separation, and has the advantages of high cutting speed, good hemostatic effect and simple operation, the ultrasonic surgical instrument is more and more applied to various endoscopic operations, such as laparoscope, prostatectomy, cystoscope, hysteroscope and the like.

In the prior art, an ultrasonic surgical instrument generally comprises a main machine, a transducer connected with the main machine, an operating handle, a cutter head assembly connected with the handle and the like. The cutting head assembly includes a sleeve assembly, a blade bar (or horn) and a jaw actuator including a fixed head assembly of an ultrasonic surgical instrument (typically, the distal portion of the blade bar is referred to as the cutting head) for providing ultrasonic energy, and a clamp arm for rotating relative to the cutting head. In the prior art, the surface of the clamping arm is generally provided with a tissue pad with a plane surface, and the clamping arm with the tissue pad is closed towards the head of the ultrasonic surgical instrument by operating the handle, so that the living tissue is cut. In the closing process of the jaws, as the tissue pad is of a plane structure, when the cutter head extrudes tissues, particularly blood vessels, slide towards the far end, and even the tissues and the blood vessels possibly slide out of the cutter head range, so that the cutting difficulty is increased, and even ineffective cutting is formed.

Those skilled in the art have sought to solve the above problems by designing the cross-section of the tissue pad to have a saw-tooth configuration that increases from the proximal end to the distal end, with a higher saw-tooth portion at the distal end to increase the grasping force on the tissue. The tissue pad has improved holding strength to structures such as fascia, blood vessels and the like with high toughness and strength, but when the tissue pad faces soft tissue parts, the tissue can not be prevented from falling off and sliding in the closing process of the jaws. In addition, the improved tissue pad and the cutter head contact area is approximately in linear contact, so that good effect cannot be achieved in the hemostasis operation.

Those skilled in the art have also sought to form the side edges of the cutting head into arcuate configurations to solve the above problems, but still do not achieve good results in hemostasis procedures. It would therefore be desirable to improve upon existing grasping arms, tissue pads, to achieve a grasp of soft tissue.

The utility model discloses to above-mentioned technical problem, designed a novel dysmorphism tissue pad, through improving the shape of tissue pad, especially through the tool bit with the two cooperations of tissue pad make the surgical instruments of this disclosure can be fine play cutting, stanch, prevent that the tissue drops the technical effect, have wide medical application prospect.

Disclosure of Invention

A brief summary of the disclosure is provided below in order 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 sole 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 in accordance with the present disclosure includes a cannula assembly including an inner tube and an outer tube; 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 cutting head; the first surface of the tissue pad is non-planar and is provided with a first part, a second part and a third part which are arranged from far to near relative to the sleeve assembly along the axial direction of the cutter head; wherein an average thickness of the second portion along a perpendicular direction from the first surface to the second surface is minimized.

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

Further wherein the sum of the projected lengths of said first and second portions in the axial direction of said cutting head is 1/5-1/3 of the projected length of said tissue bolster in the axial direction of said cutting head.

Further, the non-plane surface is an arc surface.

Further, at least one of the intersection lines of the cross section of the tissue pad along the direction perpendicular to the axial direction of the cutter head and the first surface in the first part, the second part and the third part is a concave curve shape.

Further, the section of the tissue pad along the direction vertical to the axial direction of the cutter head and the intersection line of the first surface in the first part, the second part and the third part form a U-shaped profile, so that the first surface has a U-shaped groove shape extending along the axial direction of the cutter head.

Further wherein a roughening treatment or a raised arrangement is performed on the tissue pad first surface.

Further, the roughening treatment or the protrusion is arranged at least on the contact area of the first surface and the surface of the cutter head, and the protrusion is one or more of saw tooth shape, cubic block shape, continuous step shape, barb shape and rib shape tooth.

Further wherein the height of the projections provided at the first and third portions is higher than the height of the projections provided at the second portion; or the protrusions at the periphery of the first surface are arranged more densely than the middle of the first surface; or the first part and the third part are made of a material which is less deformable than the second part; or the materials around the first surface are made of materials which are not easy to deform than the middle of the first surface.

Further, the tissue pad is arranged in a single piece, a plurality of pieces along the axial direction of the cutter head or a plurality of pieces perpendicular to the axial direction of the cutter head.

Further 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 to 2 mm.

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

Further wherein the cutting head has a tissue cutting surface facing the tissue pad, the tissue cutting surface of the cutting head being configured to have a shape that conforms to the first surface of the tissue pad to achieve contact without crevices. The scheme of the disclosure can at least help to realize one of the following effects: effectively prevent tissue, vascular slippage, further can prevent axial and horizontal slippage, improve the centre gripping effect, improve surgery's accuracy nature, realize surgery's convenience.

Drawings

The above and other objects, features and advantages of the present disclosure will be more readily understood from the following detailed description of the present disclosure with reference to the accompanying drawings. The drawings are only for the purpose of illustrating the principles of the 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;

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

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

Detailed Description

Exemplary disclosures 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. It will be appreciated, however, that in the development of any such actual implementation of the disclosure, numerous implementation-specific decisions may be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Here, it should be further noted that, in order to avoid obscuring the present disclosure by unnecessary details, only the structure of the apparatus closely related to the solution according to the present disclosure is shown in the drawings, and other details not so relevant to the present disclosure are omitted.

It is to be understood that the disclosure is not limited to the described embodiments, as described below with reference to the drawings. Herein, features between different implementations may be replaced or borrowed where feasible, and one or more features may be omitted in one implementation.

First embodiment

Referring to fig. 1-5, wherein like reference numbers refer to like elements, fig. 1-5 illustrate a first embodiment of the ultrasonic surgical instrument of the present disclosure.

The ultrasonic surgical instrument jaw includes a sleeve assembly, a blade 100, jaws 200, and a tissue pad 300. Wherein the cannula assembly comprises at least an inner tube 400 and an outer tube 500, wherein the inner tube 400 is mounted inside the outer tube 500 and can move axially relative to each other, the cutting head 100 is located inside the inner tube 400 and can vibrate axially and ultrasonically relative to the inner tube 400, the jaws 200 are respectively hinged at the front ends of the outer tube 500 and the inner tube 400, and when a trigger (not shown) of the handle of the ultrasonic surgical instrument is pressed, the inner tube 400 can move backwards and drive the jaws 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 that contacts tissue when clamped and a second surface opposite the first surface that is fixedly coupled to the jaw 200. The cutter head 100 is connected with an ultrasonic transducer (not shown) through a cutter bar (also called a waveguide rod) integrally formed with the cutter head 100, so that the cutter head 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 cutting-head 100, wherein a first surface of the tissue pad 300 faces the cutting-head 100. The first surface of the tissue pad 300 is non-planar and is divided into a first portion L1, a second portion L2 and a third portion L3 according to a distance relationship with the cannula assembly position along the axial direction of the cutting head 100; an average thickness LH2 of the second portion along a perpendicular direction from the first surface to the second surface is smaller than an average thickness LH2 of the first portion in the direction and an average thickness LH3 of the third portion in the direction.

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

It will be appreciated that the maximum thickness of the first portion of the tissue pad 300 may further be 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 first, second and third portions projected in the axial direction of the cutter head may be equal or different. Illustratively, the sum of the lengths of the projections of the first and second portions in the axial direction of the cutting head is 1/5-1/3 of the length of the projection of the tissue pad in the axial direction of the cutting head, so that the clamping effect can be improved and the surgical accuracy can be improved, and the total length of the first and second portions can be controlled within 1/3 close to the distal end of the cutting head, so that the tissue can be effectively limited to a position closer to the distal end of the cutting 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, when the jaws 200 are fully closed, contact between the cutting-head 100 and the first surface of the tissue pad 300 will leave a gap between the cutting-head 100 and the tissue pad 300 due to the presence of the medial concavity of the tissue pad 300. In order to ensure a good cutting effect of the cutting head 100, as shown in fig. 5, the 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 as to ensure the holding strength between the cutting head and the tissue pad, improve the guiding effect of the tissue pad on the tissue, and facilitate the positioning of the tissue 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 greater than 80%, and more preferably ranges from 50% to 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-toothed, cube-like, continuous step-like, barb-like, rib-like teeth, and the like.

It will be further 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 greater height than the protrusions in the middle.

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

It will further be appreciated that the tissue pad may be a unitary, monolithic form of the tissue pad, or the tissue pad may be a plurality of discrete tissue pads along the axial direction of the cutting head, or a plurality of discrete tissue pads perpendicular to the axial direction of the cutting head.

It will be further appreciated that the first portion of the tissue pad may be formed from a material that is less deformable than the material of the third portion of the tissue pad.

The arrangement of the first surface of the tissue pad can lead the ends of the two ends to guide the tissue when clamping the tissue, so that the tissue is pressed in the middle recess, and the tissue is prevented from falling off in the operation, further influencing the operation progress and even causing misoperation.

Second embodiment

Fig. 6-7 illustrate a second embodiment of the 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 based on the design of the tissue pad of the first embodiment.

FIG. 6 is a top view of the ultrasonic surgical instrument, taken from the proximal side to the distal side of the inner tube 400 in the axial direction of the blade in conjunction with FIG. 6, and at three different positions A-A, B-B, and C-C, taken in cross-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, all of which may be seen in cross-section as a straight line topography.

It will be appreciated that the first surface of the tissue pad may be provided with projections on its periphery around the first surface which are higher relative to the central portion of the tissue pad, the projections being shaped as a saw tooth triangle, a cube, a continuous step, a barb, a rib, etc. as described above. Illustratively, the difference in height between the protrusions of the peripheral portion and the protrusions of the central portion is between 1 and 2 mm.

It will be further appreciated that the periphery of the first surface of the tissue pad may be roughened, or the periphery may be made of 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 has an arc-shaped curved surface with a concave radian in the axial direction of the cutter head, if necessary, the protrusions, the roughening or the surrounding materials are matched, so that the tissue is extruded to the middle part of the jaw when the tissue pad is used, and the tissue is prevented from slipping.

Third embodiment

Fig. 8 illustrates a third embodiment of the ultrasonic surgical instrument of the present disclosure. The third embodiment is different from the second embodiment in that the shape of the cross section of the tissue pad along the direction perpendicular to the axial direction of the cutter head and the intersection line of the first surface in the first part, the second part and the third part is further improved on the basis of the design of the tissue pad of the second embodiment.

Referring to a second embodiment, which corresponds to the top view of the ultrasonic surgical instrument shown in fig. 6, the tissue pad design is further illustrated by selecting three different positions a-a, B-B, C-C at the axial direction a1 of the cutting head 100 and from the proximal to the distal with respect to the cannula assembly in fig. 6, to intercept the cross-section of the associated 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 taken perpendicular to the axial direction of the cutting head intersects the first surface at a concave curve profile in each of the first, second and third portions.

It will be appreciated that the intersection of the cross-section of the tissue pad 300 along the direction perpendicular to the axial direction of the cutting head and 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 projections on its periphery around the first surface that are higher relative to the central portion of the tissue pad, and that the projections may be in the shape of saw-tooth triangles, cuboidal blocks, continuous steps, barbs, rib-like teeth, etc., as previously described.

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

Furthermore, based on that the first surface of the tissue pad 300 not only has an arc-shaped curved surface with a concave radian in a direction parallel to the axial direction of the cutter head 100, but also has an arc-shaped curved surface with a concave radian in a direction perpendicular to the axial direction of the cutter head 100 (that is, the first surface of the tissue pad forms a spoon-shaped surface), when necessary, the first surface is matched with the bulge, the roughening or the arrangement of the surrounding materials, so that the tissue is extruded to the middle part of the jaw when in use, and the tissue is prevented from slipping.

Fourth embodiment

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

In the first to third embodiments, the first surface of the tissue pad 300 may be provided with guide arms 301 protruding upward at the first and second ends of the tissue pad along the axial direction of the cutter head, so that the tissue pad 300 is formed with a groove 302 at the middle along the axial direction of the cutter head, that is, the tissue pad takes a U-shape when viewed perpendicular to the axial direction of the cutter head.

When the tissue pad 300 is adopted, when the jaws are 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, a better operation effect is obtained when hemostasis or blood vessel cutting is performed, and meanwhile, because the U-shaped groove surrounds the tissue cutting surface of the cutter head, the tissue holding effect is better, and the radial left-right slippage of the tissue is prevented.

It will further be appreciated that ribs forming teeth 303 may also be spaced within the U-shaped recess. Due to the arrangement of the teeth 303, better friction force can be formed with the tissue during clamping, and the tissue can be prevented 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 blade of the ultrasonic surgical instrument is further modified.

Fig. 13 is a front view of the ultrasonic surgical instrument, and as can be seen in fig. 9, the cutting head 100 of the ultrasonic surgical instrument has a tissue cutting surface facing the tissue pad 300, the tissue cutting surface of the cutting head 100 is designed to be a non-planar surface 101, and the non-planar surface 101 is adapted to the shape of the first surface of the tissue pad 300, so that when the jaws 200 are fully closed, the first surface of the cutting head 100 and the first surface of the tissue pad 300 are tightly closed at the contacted portions, and no gap is generated. Thereby more tightly grasping and cutting the tissue during use. Illustratively, the non-planar shape is an arc.

While the disclosure has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are intended in an illustrative rather than in a limiting sense. Various modifications and alterations of this disclosure will become apparent to those skilled in the art from 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 assembly, a cutter head, a jaw and a tissue pad,

the cannula assembly includes an inner tube and an outer tube;

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 cutting head;

the first surface of the tissue pad is non-planar and is provided with a first part, a second part and a third part which are arranged from far to near relative to the sleeve assembly along the axial direction of the cutter head;

wherein an average thickness of the second portion along a perpendicular direction from the first surface to the second surface is minimized.

2. The ultrasonic surgical instrument of claim 1, wherein a maximum thickness in said first portion is greater than or equal to a maximum thickness in said 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 in the axial direction of said blade is 1/5-1/3 of the projected length of said tissue pad in the axial direction of said blade.

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

5. The ultrasonic surgical device of any one of claims 1-2 and 4, wherein at least one of the intersection lines of a cross section of said tissue pad taken perpendicular to the axial direction of the blade and said first surface in said first, second and third portions has a concave curved profile.

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

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

8. The ultrasonic surgical device of claim 7, wherein the roughening or protrusions are provided on at least a first surface in contact with the surface of the blade, and the protrusions are one or more of saw-tooth, cube-block, continuous step, barb, rib-like teeth.

9. The ultrasonic surgical instrument of claim 7 wherein the height of the protrusions provided in said first and third portions is greater than the height of the protrusions provided in said second portion;

or the protrusions at the periphery of the first surface are arranged more densely than the middle of the first surface;

or the first part and the third part are made of a material which is less deformable than the second part;

or the materials around the first surface are made of materials which are not easy to deform than the middle of the first surface.

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

11. The ultrasonic surgical instrument of any 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-2 mm.

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

13. The ultrasonic surgical device of any of claims 1-2, 4, 8-9, wherein said blade has a tissue cutting surface facing said tissue pad, said blade tissue cutting surface being configured to have a shape that conforms to a first surface of said tissue pad to achieve contact without gaps.