Ultrasonic scalpel head

Abstract

The present invention discloses an ultrasonic scalpel head. The projection of the scalpel head on the shear plane is banana-shaped and curved. From the proximal end to the distal end, the thickness of the scalpel head first becomes thicker, then thinner, then thicker again and then thinner. The projection perpendicular to the shear plane is in the shape of a fruit knife. The height of the scalpel head first becomes lower, and then gradually decreases, and there is an arc-shaped cutting groove at the middle position. The present invention can cause an increase in the swing amplitude of the bending direction of the scalpel head and the effective working length. There is a boat-shaped or arc-shaped balance cutting groove between the most distal node of the ultrasonic scalpel head and the tip of the scalpel head to improve the stability of ultrasonic vibration.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a blade tip of an ultrasonic scalpel. Background Art

[0002] An ultrasonic scalpel (hereinafter referred to as an ultrasonic knife) refers to a device that further amplifies the ultrasonic vibration obtained through a piezoelectric transducer (the electric energy is transmitted to the piezoelectric transducer by an energy generator, and the piezoelectric transducer converts the electric energy into ultrasonic mechanical energy), and the amplified ultrasonic vibration is used by the head of the scalpel for cutting and coagulating soft tissues. Clinically, this device can achieve lesion resection at a lower temperature and with less bleeding, and can ensure the minimum lateral thermal damage to tissues. With the popularization of minimally invasive surgery, the ultrasonic scalpel has become a conventional surgical instrument.

[0003] Currently, the generally clamped length (i.e., the working length) of the ultrasonic scalpel is relatively short, and the vast majority of the single-cut length is about 13 mm, resulting in too high a frequency of tissue separation operations during the operation and a relatively long operation time; the relatively short clamped length also leads to a significant decrease in the sealing reliability when the blood vessel diameter exceeds 3 mm, and it is even ineffective for blood vessels with a diameter exceeding 5 mm. Moreover, due to the relatively small vibration amplitude, the operation time is also too long. Summary of the Invention

[0004] The present invention provides an ultrasonic scalpel blade tip that can improve the hemostasis effect and increase the effective working length to solve the above problems of the prior art.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An ultrasonic scalpel blade tip includes a blade tail at the proximal end and a blade tip at the distal end. The joint surface of the blade tip and the claw pad of the ultrasonic scalpel is a shear surface. The projection of the ultrasonic scalpel blade tip on the shear surface is in a banana-shaped curved shape, and the thickness changes from the blade tail to the blade tip, with the thicknesses being T1, T2, T3, and T4 in sequence, where T1>T3>T2>T4, and T1 = T2 + T3 + T4 with an error of ±10%.

[0007] An ultrasonic scalpel head includes a tool shank at the proximal end and a tool tip at the distal end. The bonding surface of the scalpel head with the claw pad of the ultrasonic scalpel is a shear surface. The projection of the ultrasonic scalpel head on the shear surface is in a banana-shaped curved form, including a front concave surface and a rear convex surface. The length of the front concave surface is L1, and the radius of curvature is R2. The length of the rear convex surface is L2, and it includes a first convex surface near the tool shank and a second convex surface near the tool tip, with a smooth transition between them. The radius of the first convex surface is R4, and the radius of the second convex surface is R3. The thickness of the tool shank is T1, and the thickness of the tool tip is T4. The angle between the center line at the tool tip and the horizontal line is α, satisfying the following formula:

[0008] Error ±10%.

[0009] Preferably, the length L1 of the front concave surface is between 15 mm and 19 mm, preferably 17.5 mm.

[0010] Preferably, the radius of curvature R2 of the front concave surface is between 19 mm and 25 mm, preferably 22 mm.

[0011] Preferably, the length L2 of the rear convex surface is between 13 mm and 17 mm, preferably 14.5 mm.

[0012] Preferably, the radius R4 of the first convex surface of the rear convex surface is between 3 mm and 7 mm, preferably 5 mm, and the radius R3 of the second convex surface is between 12 mm and 16 mm, preferably 14 mm.

[0013] Preferably, the tool shank 101 at the proximal end has a cylindrical section extending proximally.

[0014] Preferably, on the projection on the shear surface, the highest point of the tool tip is higher than the highest point of the cylindrical section, and the lowest point of the second convex surface is lower than the lowest point of the cylindrical section.

[0015] An ultrasonic scalpel head includes a tool shank at the proximal end and a tool tip at the distal end. The bonding surface of the scalpel head with the claw pad of the ultrasonic scalpel is a shear surface. The projection of the ultrasonic scalpel head on the shear surface is in a banana-shaped curved form, and the projection perpendicular to the shear surface is in the shape of a fruit knife, with the height gradually decreasing from the tool shank to the tool tip, and an arc-shaped cutting groove is provided near the tool shank.

[0016] The radius of the arc-shaped cutting groove is R1, preferably 7 mm.

[0017] Preferably, an arc-shaped cutting surface is provided at the upper end of the scalpel head, and a V-shaped cutting groove is provided at the lower end.

[0018] Preferably, the width of the distal end of the ultrasonic scalpel head in the direction perpendicular to the shearing plane is half of the diameter of the proximal end.

[0019] An ultrasonic scalpel head includes a knife tail at the proximal end and a knife tip at the distal end. The bonding surface of the scalpel head with the claw pad of the ultrasonic scalpel is a shearing plane. The projection of the ultrasonic scalpel head on the shearing plane is in a banana-shaped curved form. At least one balance groove is provided between the knife tail and the first node of the ultrasonic scalpel.

[0020] Preferably, the projection of the balance groove on the shearing plane is in a boat-shaped structure, or in an arc structure, or a combination of a boat-shaped structure and an arc structure.

[0021] The beneficial effects of the present invention are mainly reflected in that: the projection of the ultrasonic scalpel head of the present invention on the shearing plane is in a banana-shaped curved form. From the proximal end to the distal end, the thickness of the scalpel head changes from thick to thin, then thickens and thins again. The projection perpendicular to the shearing plane is in the shape of a fruit knife. The height of the scalpel head changes from high to low and then gradually decreases, and there is an arc-shaped cutting groove in the middle position, which can cause an increase in the oscillation amplitude of the bending direction of the scalpel head and the effective working length; there is a boat-shaped or arc-shaped balance cutting groove between the most distal node of the ultrasonic scalpel head and the tip of the scalpel head to improve the stability of ultrasonic vibration. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the ultrasonic scalpel head of the present invention used in endoscopic surgical instruments;

[0023] Figure 2 is a detailed assembly schematic diagram of the ultrasonic scalpel head of the present invention used in endoscopic surgical instruments;

[0024] Figure 3 and Figure 4 is a schematic diagram of the projection of the ultrasonic scalpel head of the present invention on the shearing plane;

[0025] Figure 5 is a schematic diagram of the projection of the ultrasonic scalpel head of the present invention perpendicular to the shearing plane;

[0026] Figure 6 is a schematic diagram of the structure of the tip of the ultrasonic scalpel head of the present invention;

[0027] Figure 7 is a schematic diagram of the first embodiment of the balance groove of the ultrasonic scalpel head of the present invention;

[0028] Figure 8 is a schematic diagram of the second embodiment of the balance groove of the ultrasonic scalpel head of the present invention. Detailed Embodiments

[0029] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodical, or functional transformations made by those of ordinary skill in the art based on these embodiments are included within the protection scope of the present invention.

[0030] As Figure 1 and Figure 2 shown, the present invention discloses an ultrasonic scalpel head 100, which is applied to endoscopic surgical instruments 110 or open surgical instruments. The ultrasonic scalpel head 100 is disposed at the distal end of the surgical instrument and cooperates with a claw pad arranged relatively pivotally to perform tissue cutting and / or suturing.

[0031] Combined with Figures 3 to 6 shown, the ultrasonic scalpel head 100 of the preferred embodiment of the present invention includes a shank end 101 at the proximal end and a tip 102 at the distal end, and the bonding surface of the scalpel head with the claw pad of the ultrasonic scalpel is a shear surface.

[0032] The projection of the ultrasonic scalpel head on the shear surface is in a banana-shaped curved form, with a thickness variation formed from the shank end 101 to the tip 102, and the thicknesses are T1, T2, T3, and T4 in sequence, where T1>T3>T2>T4, and T1 = T2 + T3 + T4 with an error of ±10%.

[0033] Since the proximal end of the ultrasonic scalpel head of the present invention is the support end during actual use, in order to maintain the overall rigidity and stability, the maximum dimension is required. The distal tip needs to be the minimum dimension in order to achieve better separation and more delicate operations. For a curved scalpel head, the scalpel head itself will generate bending vibrations, which will in turn cause transverse vibrations of the shank, resulting in abnormal vibrations, abnormal noises, and heat generation. Therefore, the present invention ensures the overall balance by controlling the dimensions of each part of the scalpel head.

[0034] Specifically, the banana-shaped curved form of the projection of the ultrasonic scalpel head of the present invention on the shear surface includes a front concave surface and a rear convex surface. The length 114 of the front concave surface is L1, the radius of curvature 113 is R2, the length 117 of the rear convex surface is L2, and it includes a first convex surface near the shank end 101 and a second convex surface near the tip 102, with a smooth transition between them. The radius 118 of the first convex surface is R4, the radius 116 of the second convex surface is R3, the thickness of the shank end 101 is T1, the thickness of the tip 102 is T4, and the angle 119 between the center line at the tip and the horizontal line is α, satisfying the following formula:

[0035] With an error of ±10%.

[0036] The knife tail 101 located at the proximal end has a cylindrical section 111 extending proximally. In the projection on the shearing surface, the highest point 115 of the knife tip 102 is higher than the highest point of the cylindrical section 111, and the lowest point of the second convex surface 116 is lower than the lowest point of the cylindrical section 111.

[0037] The difference in the arc lengths of the front concave surface and the rear convex surface is determined by the combined action of the diameter T1 of the rear support section and the tip thickness T4. The tool shank designed to meet the above formula can ensure to the greatest extent that the overall design center of gravity of the curved tool head shape is located on the center line of the shank, thus ensuring the stability of the vibration mode. And it can be realized that the highest point of the tool head tip is higher than the highest point of the cylindrical section 111, and the lowest point of the second convex surface 116 is lower than the lowest point of the cylindrical section 111. This design can ensure the stability of the vibration mode and realize the bending curvature of the curved tool head to the greatest extent. In this way, the flapping amplitude along the bending direction can be significantly increased, and a faster heat accumulation speed can also be generated, which helps to coagulate more firmly between the blood vessel walls, thereby achieving a more reliable blood vessel closing effect.

[0038] In this preferred embodiment, the length L1 of the front concave surface is between 15 mm and 19 mm, preferably 17.5 mm. This length determines the shearing length of the final product. If it is too long, it will lead to a decrease in the resonant frequency, an increase in the processing difficulty, and an increase in the resonant stress. Comprehensively, 17.5 mm is an ideal parameter.

[0039] In this preferred embodiment, the radius of curvature R2 of the front concave surface is between 19 mm and 25 mm, preferably 22 mm.

[0040] In this preferred embodiment, the length L2 of the rear convex surface is between 13 mm and 17 mm, preferably 14.5 mm.

[0041] In this preferred embodiment, the radius R4 of the first convex surface of the rear convex surface is between 3 mm and 7 mm, preferably 5 mm

[0042] In this preferred embodiment, the radius R3 of the second convex surface is between 12 mm and 16 mm, preferably 14 mm.

[0043] In this preferred embodiment, the thickness T1 of the knife tail is between 2.2 mm and 2.8 mm, preferably 2.6 mm.

[0044] In this preferred embodiment, the thickness T4 of the tool tip is between 0.8 mm and 1.2 mm, preferably 0.9 mm. If the tip thickness is too thick, the shear plane will be too wide, which is not conducive to fine operations; if it is too narrow, the strength will decrease and the tool head is prone to deformation. If the tip is too sharp, the risk of accidentally injuring healthy tissues during the operation will increase. Therefore, 0.9 mm preferred in this preferred embodiment is an ideal parameter.

[0045] In this preferred embodiment, the angle α between the center line of the tool tip and the horizontal line is about 30°.

[0046] Specifically, as Figure 5 shown, in the present invention, the projection of the ultrasonic scalpel head on the plane perpendicular to the shear plane is in the shape of a fruit knife, and the height gradually decreases from the tool tail 101 to the tool tip 102, and an arc-shaped cutting groove 112 is provided near the tool tail 101. This progressive conical structure design can increase the effective working length. A longer working length can achieve better closure of large-diameter blood vessels, can also achieve a faster tissue separation speed, effectively reduce the duration of a single operation and the frequency of operations, and reduce the fatigue intensity of medical staff.

[0047] In this preferred embodiment, the radius of the arc-shaped cutting groove 112 is R1, preferably 7 mm. The width T5 at the farthest end is half of the diameter T1 at the proximal end. The design of this size can ensure that the lowest point of the tool tip is exactly on the center line of the rod body, and the spatial volume removed by the arc-shaped cutting groove 112 can exactly compensate for the unstable vibration brought by the distal progressive conical structure. On the premise of ensuring stability, the progressive conical structure can maximize the increase in the effective length.

[0048] Specifically, as Figure 6 shown, when projected along the central axis direction of the tool tip, an arc-shaped cutting surface 120 is provided at the upper end of the tool head, and a V-shaped cutting groove 121 is provided at the lower end. The included angle formed by the two inclined surfaces of the V-shaped cutting groove 121 is preferably 100°. The arc-shaped cutting surface 120 and the claw pad act together to achieve the effects of cutting and coagulating soft tissues. The sharp edge formed by the V-shaped cutting groove 121 helps to better separate the thin film tissue.

[0049] As Figure 7 and Figure 8 shown, at least one balance groove is provided between the tool tail 101 of the ultrasonic scalpel head and the first node 122 of the ultrasonic scalpel. The projection of the balance groove on the shear plane can be Figure 7 the boat-shaped structure 123 shown, or Figure 8The arc structure 124 shown may be a combination of a boat-shaped structure and an arc structure. Such a structure is used to improve the stability of ultrasonic vibration. As described in the foregoing cutter head shape design, the curved asymmetric cutter head structure design itself is likely to cause unstable operation of the cutter head. Considering the actual situations such as the deviation in the machining itself and the bending of the long straight tool shank, the final product may generate very large bending vibrations, torsional vibrations or other forms of vibrations. This will reduce the system stability, generate abnormal noises, reduce the ultrasonic transmission efficiency, generate abnormal heat and other adverse results. In view of this, the present invention proposes to add one or more balance grooves, and preferably, the compensation position is between the most distal node and the middle position of the cutter head.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as a limitation to the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art in this technical field, without departing from the spirit and scope of the present invention, several improvements and refinements can also be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An ultrasonic scalpel head, comprising a knife tail (101) at the proximal end and a knife tip (102) at the distal end, wherein the joint surface of the scalpel head and the claw pad of the ultrasonic scalpel is a shear surface, characterized in that, The projection of the ultrasonic scalpel head on the shearing plane is banana-shaped and curved, including a front concave surface and a rear convex surface. The length (114) of the front concave surface is L1, and the radius of curvature (113) is R2. The length (117) of the rear convex surface is L2, and it includes a first convex surface near the knife tail (101) and a second convex surface near the knife tip (102), with a smooth transition between them. The radius of the first convex surface is R4, and the radius of the second convex surface (116) is R3. The thickness of the knife tail (101) is T1, and the thickness of the knife tip (102) is T4. The angle (119) between the center line at the knife tip and the horizontal line is α, satisfying the following formula: Error ±10%; The knife tail (101) at the proximal end has a cylindrical section (111) extending proximally; on the projection on the shearing plane, the highest point (115) of the knife tip (102) is higher than the highest point of the cylindrical section (111), and the lowest point of the second convex surface (116) is lower than the lowest point of the cylindrical section (111); in the projection perpendicular to the shearing plane, it is in the shape of a fruit knife, with the height gradually decreasing from the knife tail (101) to the knife tip (102), and an arc-shaped cutting groove (112) is provided near the knife tail (101); an arc-shaped cutting surface (120) is provided at the upper end of the scalpel head, and a V-shaped cutting groove (121) is provided at the lower end.

2. The ultrasonic scalpel head according to claim 1, wherein, The length (114) L1 of the front concave surface is between 15 mm and 19 mm.

3. The ultrasonic scalpel head according to claim 1, characterized in that, The radius of curvature (113) R2 of the front concave surface is between 19 mm and 25 mm.

4. The ultrasonic scalpel head according to claim 1, wherein, The length (117) L2 of the rear convex surface is between 13 mm and 17 mm.

5. The ultrasonic scalpel head according to claim 1, characterized in that, The radius R4 of the first convex surface of the rear convex surface is between 3 mm and 7 mm, and the radius R3 of the second convex surface (116) is between 12 mm and 16 mm.

6. The ultrasonic scalpel head according to claim 1, wherein, The width of the ultrasonic scalpel head at the distal end in the direction perpendicular to the shearing plane is half of the diameter at the proximal end.

7. The ultrasonic scalpel head according to claim 1, wherein, At least one balance groove is provided between the knife tail (101) and the first node (122) of the ultrasonic scalpel.

8. The ultrasonic scalpel head according to claim 7, characterized in that, The projection of the balance groove on the shearing plane is a boat-shaped structure (123), or an arc-shaped structure (124), or a combination of a boat-shaped structure and an arc-shaped structure.

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