Ultrasonic scalpel with curved tip

Abstract

An ultrasonic scalpel with a curved tip comprises a coupling portion, a blade portion, a curved tip portion and a blade head portion in sequence, wherein the total length of the curved tip portion and the blade head portion is 60-80 mm, and the angle between the central axis of the blade head portion and the central axis of the blade portion is 5-30 degrees. The present application can realize the curved waveguide working in the longitudinal vibration mode at a specific frequency while suppressing the radial vibration caused by the asymmetry of the waveguide, thereby effectively improving the flexibility of the medical staff in using the ultrasonic scalpel to process the target tissue hidden behind the bone during the operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, and particularly relates to an end-bent ultrasonic scalpel applied to ultrasonic medical treatment. BACKGROUND

[0002] In clinical practice, the ultrasonic scalpel is widely used for cutting, coagulating and hemostasis of soft tissues in surgery. Compared with traditional surgical instruments, the ultrasonic scalpel has the advantages of reducing bleeding, improving the accuracy of cutting and coagulation, reducing damage to surrounding tissues, having no risk of electric shock and generating less smoke. With the increasing types of surgeries in which the ultrasonic scalpel is applied, in some surgical scenarios in which target tissues are hidden behind bones, for example, thoracic minimally invasive surgery, the traditional ultrasonic scalpel needs to be tilted at a large angle to enter the patient's body, thereby limiting the flexibility of the doctor's operation. SUMMARY

[0003] The present application aims at the problem that the existing ultrasonic scalpel has a long straight rod structure or a small bending degree, and the offset of the tip position relative to the central axis of the rod is limited. The present application provides an ultrasonic scalpel with a bent end, which can realize the operation of a bending waveguide in a longitudinal vibration mode at a specific frequency while suppressing the radial vibration caused by the asymmetry of the waveguide, thereby effectively improving the flexibility of medical personnel in using the ultrasonic scalpel to process target tissues hidden behind bones during surgery.

[0004] The present application is implemented by the following technical solutions:

[0005] The present application relates to an end-bent ultrasonic scalpel sequentially comprising a coupling part, a rod part, an end-bent rod part and a head part, wherein the total length of the end-bent rod part and the head part is 60-80 mm, and the included angle between the central axis of the head part and the central axis of the rod part is 5-30 degrees.

[0006] The end-bent rod part comprises two sequentially connected arc-shaped waveguides, the central axis of the arc-shaped waveguide is a circular arc, and the cross section is circular.

[0007] The coupling part is used for transition and prevention of rod breakage caused by excessive stress, and specifically comprises a cylindrical waveguide with a threaded hole and a catenary transition structure, wherein the coupling part is connected with the output end of an ultrasonic vibrator to transfer the energy of the ultrasonic vibrator to the rod part.

[0008] The rod part comprises three sub-rod parts of cylindrical waveguides with diameters sequentially increasing, wherein a catenary structure is arranged between the first and second sub-rod parts for transition.

[0009] The head part is a head with an irregular cross section and a straight central axis to further improve the longitudinal vibration amplitude of the head output point, and the head is connected with the end-bent rod part through a catenary transition.

[0010] When ultrasonic waves propagate within the tool holder, they generate longitudinal and transverse vibrations. The vibration velocity of the particles decreases sequentially within the three sub-tool holders, reducing energy loss. Furthermore, the larger diameter suppresses transverse vibrations. At the operating frequency, this structure resonates, and the resonant energy propagates to the tool tip, generating strong longitudinal vibrations.

[0011] The use of catenary curves to transition between the coupling part and the tool holder part, between the second and third sub-tool holders in the tool holder part, and between the tool head part and the curved part of the tool holder can alleviate stress concentration caused by abrupt changes in cross-section.

[0012] Technical effect

[0013] Compared to existing technologies, this invention allows the scalpel to operate in an almost "pure" longitudinal vibration mode when working stably at its operating frequency (56.736kHz), effectively suppressing lateral vibration and resulting in strong scalpel stability. This invention is expected to improve the flexibility of medical personnel in handling target tissues hidden behind bones during surgery. The output of the ultrasonic transducer is amplified through the scalpel head, improving energy conversion efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the cutter head.

[0016] Figure 3 This is a schematic diagram of the cutter head output;

[0017] Figure 4 This is the mode shape diagram of the surgical scalpel. Detailed Implementation

[0018] like Figure 1 As shown, this embodiment of an ultrasonic scalpel with a curved end includes a coupling portion C, a scalpel portion B, a curved end portion A, and a blade head portion H. The total length of the curved end portion and the blade head portion is 60-80 mm. The angle between the central axis of the blade head portion and the central axis of the scalpel portion is 5°-30°, causing the blade head output point to deviate from the central axis of the scalpel by a certain distance. This allows medical personnel to more flexibly handle target tissues hidden behind bone during surgery. The geometric central axis of the curved end portion is a smooth arc. This smooth transition reduces radial vibration caused by waveguide asymmetry, helping to maintain blade stability.

[0019] The ultrasonic scalpel is integrally formed by TC4 alloy one-time forging, has a working frequency of 55 kHz-57 kHz, and has a whole length of 250 mm-270 mm, i.e. an integer multiple of a half wavelength of a sound wave in the TC4 material at the working frequency (the wavelength of the sound wave in the material is 88 mm).

[0020] The curved end of the blade rod comprises a first arc waveguide A1 and a second arc waveguide A2 in sequence.

[0021] The first arc waveguide A1 has an arc length of 19 mm-21 mm of the central axis, starts from a node and ends at a loop, and the tangent of the central axis at the node is coincident with the central axis of the blade rod part.

[0022] The second arc waveguide A2 has a length of 19 mm-21 mm of the central axis, and the diameter of the second arc waveguide A2 is smaller than that of the first arc waveguide A1, the second arc waveguide A2 starts from a loop and ends at a node, and the tangent of the central axis at the node is coincident with the central axis of the blade head part.

[0023] The blade rod part B comprises a first sub-blade rod B1, a second sub-blade rod B2, a first catenary transition B3 and a third sub-blade rod B4 in sequence, wherein the first sub-blade rod B1 is connected with the second sub-blade rod B2 and the coupling part C respectively, and the third sub-blade rod B4 is connected with the first catenary transition B3 and the first arc waveguide A1 respectively.

[0024] The diameters of the first to third sub-blade rods B1, B2 and B4 increase in sequence, wherein the diameter of the second sub-blade rod B2 increases by 0.1 mm-0.3 mm compared with that of the first sub-blade rod B1, and the diameter of the third sub-blade rod B4 increases by 0.6 mm-1 mm compared with that of the second sub-blade rod B2, the structure effectively suppresses the transverse vibration caused by the asymmetry of the waveguide, and the diameter changes occur at the loops or nodes, and the lengths of the central axes of the three are 20 mm, 20 mm and 120 mm respectively.

[0025] The boundary between the first sub-blade rod B1 and the second sub-blade rod B2 is at a loop, and a smaller size change can reduce energy loss.

[0026] The curved form of the blade rod end is that a cylindrical waveguide is curved through a circular arc as a central axis starting from the second last node and ending at the last node, and the change in the geometry of the waveguide starts and ends at the nodes, which can reduce energy loss.

[0027] The first catenary transition B3 is at a longitudinal vibration node, and the length of the central axis is determined by the length of the longitudinal vibration amplitude of 0.2-0.2 times the longitudinal vibration amplitude of the adjacent loop.

[0028] The diameter of the first arc waveguide A1 is the same as that of the third blade rod B4.

[0029] The coupling section C is used to prevent damage of the ultrasonic scalpel rod caused by stress concentration due to interface mutation when the ultrasonic vibrator works, and specifically comprises a cylindrical waveguide C1 and a second catenary transition C2, wherein the cylindrical waveguide C1 is connected with the ultrasonic vibrator of the previous stage and the second catenary transition C2 respectively, and the second catenary transition C2 is connected with the second catenary transition C2 and the rod section B respectively.

[0030] The input end of the cylindrical waveguide C1 is designed with a threaded hole with a specification of 4#-40*5 / 8, and is connected with the ultrasonic vibration system composed of the transducer and the amplitude rod.

[0031] The second catenary transition C2 is located at the node of longitudinal vibration, and the length of the axis is determined by the length of the amplitude value of the longitudinal vibration of 0.2-0.2 times the amplitude value of the adjacent wave crest.

[0032] The head section H comprises a third catenary transition H1 and a head H2, wherein the third catenary transition H1 is connected with the head H2 and the second arc-shaped waveguide A2 respectively.

[0033] As shown in the figure, the cross section of the head H2 is obtained by setting a circle with the same length as the rectangle and concentric with the rectangle, and the shape of the intersection part of the two is the cross section of the head. Figure 2

[0034] The device works in the following way: when an excitation signal with an amplitude of 25 μm and a frequency of 55 kHz-57 kHz is added to the input end of the coupling section C1, the peak-to-peak value of the amplitude output by the head H2 exceeds 70 μm, as shown in the figure. Figure 3

[0035] In the case of adding the above excitation signal, the ratio of the amplitude of the longitudinal displacement to the amplitude of the transverse displacement of the rod in the modal analysis is close to 28, as shown in the figure. Figure 4 As shown in the figure, the color from cold to warm represents the normalized amplitude of the longitudinal vibration from small to large, the output of the head is maximum, and the transverse vibration of the rod is obviously suppressed.

[0036] Compared with the existing straight rod-shaped ultrasonic scalpel, the device can obtain similar or better cutting performance and rod stability under the condition of bending of the rod: the simulation shows that the device can work safely within a fixed frequency, the peak-to-peak value of the longitudinal amplitude of the output end exceeds 70 μm when an excitation with an amplitude of 25 μm is used at the input end, and the ratio of the longitudinal amplitude to the transverse amplitude of the rod is close to 28, which effectively suppresses the transverse displacement of the rod while ensuring the cutting and hemostasis quality.

[0037] ​​The above specific embodiments can be partially adjusted in different ways by those skilled in the art without departing from the principles and purposes of the present application, the protection scope of the present application is subject to the claims and is not limited by the above specific embodiments, each implementation within the scope is subject to the present application.

Claims

1. An end-bent ultrasonic scalpel, characterized by comprising: The coupling portion, the shank portion, the shank end curved portion and the tool bit portion are sequentially arranged, wherein the included angle between the central axis of the tool bit portion and the central axis of the shank portion is 5°-30°; The shank end curved portion comprises a first arc-shaped waveguide and a second arc-shaped waveguide sequentially arranged; The shank portion comprises a first sub-shank, a second sub-shank, a first catenary transition and a third sub-shank sequentially arranged, wherein the first sub-shank is connected with the second sub-shank and the coupling portion respectively, and the third sub-shank is connected with the first catenary transition and the first arc-shaped waveguide respectively; The diameters of the first to third sub-shanks increase sequentially, wherein the diameter of the second sub-shank increases by 0.1mm-0.3mm compared with the first sub-shank, and the diameter of the third sub-shank increases by 0.6mm-1mm compared with the second sub-shank, and the diameter changes occur at the wave antinode or the wave node, and the lengths of the central axes of the three are 20mm, 20mm and 120mm respectively.

2. The end-bent ultrasonic surgical knife according to claim 1, characterized by The arc length of the central axis of the first arc-shaped waveguide is 19mm-21mm, and the first arc-shaped waveguide starts at the wave node and ends at the wave antinode, and the tangent line of the central axis at the wave node coincides with the central axis of the shank portion; The length of the central axis of the second arc-shaped waveguide is 19mm-21mm, and the diameter of the second arc-shaped waveguide is smaller than that of the first arc-shaped waveguide, and the second arc-shaped waveguide starts at the wave antinode and ends at the wave node, and the tangent line of the central axis at the wave node coincides with the central axis of the tool bit portion.

3. The end-bent ultrasonic surgical knife according to claim 1, characterized by The boundary between the first sub-shank and the second sub-shank is at the wave antinode.

4. The end-bent ultrasonic surgical knife according to claim 1, characterized by The coupling portion comprises a cylindrical waveguide and a second catenary transition, wherein the cylindrical waveguide is connected with the ultrasonic transducer of the previous stage and the second catenary transition respectively, and the second catenary transition is connected with the second catenary transition and the shank portion respectively; The shank end curved portion is in the form of a circular arc as the central axis to guide the bending of the cylindrical waveguide from the second last wave node to the last wave node.

5. The end-bent ultrasonic surgical knife according to claim 1, wherein The first catenary transition is at the longitudinal vibration node, and the length of the central axis is determined by the length of the longitudinal vibration amplitude of-0.2-0.2 times the longitudinal vibration amplitude of the adjacent wave antinode.

6. The end-bent ultrasonic surgical knife according to claim 2, wherein The diameter of the first arc-shaped waveguide is the same as that of the third shank.

7. The end-bent ultrasonic surgical knife according to claim 4, wherein The second catenary transition is at the longitudinal vibration node, and the length of the central axis is determined by the length of the longitudinal vibration amplitude of-0.2-0.2 times the longitudinal vibration amplitude of the adjacent wave antinode.

8. The end-bent ultrasonic surgical knife according to claim 1, characterized by The tool bit portion comprises a third catenary transition and a tool bit, wherein the third catenary transition is connected with the tool bit and the second arc-shaped waveguide respectively; The cross section of the tool bit is obtained by setting a circle with the same length as the rectangle and concentric with the rectangle, and the shape of the intersection part of the two is the cross section of the tool bit.

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