Compound vibration ultrasonic scalpel

Abstract

The present invention discloses a composite vibration ultrasonic surgical knife, which includes a cutter head, a horn, an end cap assembly, a longitudinal vibration piezoelectric ceramic, a copper electrode sheet, a mounting base, and a circumferential rotation assembly, wherein the circumferential rotation assembly includes a circumferential rotation piezoelectric ceramic, a stator, a rotor, and a preload adjustment column, wherein one end of the horn is detachably connected to the cutter head, and the other end of the horn is connected to the rotor, and the rotor is rotatably sleeved on the preload adjustment column; the stator is arranged on one side of the mounting base, and one side of the mounting base is connected to the end cap assembly, and the longitudinal vibration piezoelectric ceramic and the copper electrode sheet are arranged in series on the end cap assembly, and the circumferential rotation piezoelectric ceramic is used to excite the friction coupling between the stator and the rotor. In the present invention, the piezoelectric ceramic realizes the longitudinal vibration effect of the cutter head, and the stator and the rotor cooperate to realize the circumferential rotation of the cutter head, so as to realize the effect of the longitudinal and circumferential rotation composite vibration of the cutter head, improve the cutting efficiency of hard tissue, and also ensure the consistency of the transverse and longitudinal cutting quality of the biological soft tissue blade, which is conducive to a higher level of surgical operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a composite vibration ultrasonic scalpel. Background Art

[0002] With the development of social economy and science, surgical treatment options in medicine have also become diversified. In 1973, Breyakov of the Soviet Union used ultrasonic scalpels for the first time in surgery, which has the advantages of less damage to the tissues around the incision and less bleeding from the incision. At present, ultrasonic scalpels have been widely used in modern medical systems, especially in the fields of ophthalmology, thoracic surgery, general surgery, orthopedics, etc., which have reduced a lot of surgical pain for patients and brought doctors a higher level of surgical operation. However, for the removal of tissues with higher hardness, the cutting efficiency of the currently used longitudinal vibration ultrasonic scalpels is low.

[0003] Therefore, it is necessary to provide a new composite vibration ultrasonic scalpel to solve the above-mentioned technical problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a composite vibration ultrasonic scalpel, aiming to solve the problem of low cutting efficiency of existing ultrasonic scalpels in some application scenarios.

[0005] To achieve the above-mentioned purpose, the composite vibration ultrasonic surgical knife proposed in the present invention includes a blade head, a variable amplitude rod, an end cover assembly, a longitudinal vibration piezoelectric ceramic, a copper electrode sheet, a mounting base, and a circumferential rotation assembly, wherein the circumferential rotation assembly includes a circumferential rotation piezoelectric ceramic, a stator, a rotor and a preload adjustment column, one end of the variable amplitude rod is detachably connected to the blade head, the other end of the variable amplitude rod is connected to the rotor, and the rotor is rotatably sleeved on the preload adjustment column; the stator is arranged on the inner side of the mounting groove of the mounting base, one side of the mounting base is connected to the end cover assembly, the longitudinal vibration piezoelectric ceramic and the copper electrode sheet are arranged in series on the end cover assembly, and the circumferential rotation piezoelectric ceramic is used to excite the friction coupling between the stator and the rotor.

[0006] Preferably, the stator is provided with a plurality of groups of limit protrusions arranged in pairs, there are gaps between the limit protrusions arranged in pairs, and the plurality of groups of limit protrusions are arranged at intervals along the circumference of the stator; the rotor is provided with a plurality of contact blocks, and the plurality of contact blocks are arranged at intervals along the circumference of the rotor, the number of the contact blocks is consistent with the number of groups of the limit protrusions and are arranged in a one-to-one correspondence, and the contact block is arranged between the gaps between two corresponding limit protrusions in the same group.

[0007] Preferably, the circumferentially rotating piezoelectric ceramic is provided with a plurality of polarity regions staggeredly arranged along the circumference of the circumferentially rotating piezoelectric ceramic, any two adjacent polarity regions have opposite polarities, and the number of the polarity regions is consistent with the number of the limiting protrusions and are arranged in a one-to-one correspondence.

[0008] Preferably, the circumferential rotation component also includes a preload adjustment bolt, the bottom surface of the preload adjustment column is in contact with the mounting base, the bottom end of the preload adjustment bolt is connected to the base via a thread, and the top of the preload adjustment bolt is in contact with the end surface of the preload adjustment column.

[0009] Preferably, a mounting groove is provided at one end of the mounting base facing the cutter head, the stator is fixedly mounted on the bottom wall of the mounting groove by fasteners, and the circumferentially rotating piezoelectric ceramic is attached to a side of the stator facing the bottom wall of the mounting groove.

[0010] Preferably, a through hole connected to the mounting groove is formed on a side wall of the mounting base, and the through hole is used for allowing a power signal line of the circumferentially rotating piezoelectric ceramic to pass through.

[0011] Preferably, the opening edge cover of the mounting slot is provided with a base end cover.

[0012] Preferably, the rotor is rotatably connected to the preload adjustment column via a bearing, a stepped hole is provided in the middle of the rotor, the diameter of the small hole of the stepped hole is larger than the diameter of the preload adjustment column, the inner ring of the bearing abuts against the end of the preload adjustment column, and the outer ring of the bearing abuts against the stepped surface of the stepped hole.

[0013] Preferably, the end cover assembly includes a front end cover, a rear end cover and a connecting bolt, the longitudinal vibration piezoelectric ceramic and the copper electrode sheet are clamped between the front end cover and the rear end cover, and the connecting bolt passes through the front end cover, the longitudinal vibration piezoelectric ceramic, the copper electrode sheet and the rear end cover and is connected to the mounting base.

[0014] Preferably, adhesive is applied to the connection surface between any two of the front end cover, the longitudinal vibration piezoelectric ceramic, the copper electrode sheet and the rear end cover.

[0015] In the technical solution of the present invention, piezoelectric ceramics realize the longitudinal vibration effect of the blade, and the stator and rotor cooperate to realize the circumferential rotation of the blade, thereby realizing the effect of longitudinal and circumferential rotation composite vibration of the blade, which is beneficial to the lightweight and integration of the ultrasonic scalpel system; it improves the cutting efficiency of hard tissues, and also ensures the consistency of the transverse and longitudinal cutting quality of the biological soft tissue blade, which is beneficial to the beauty of wounds and rapid recovery after surgery, and is also beneficial to higher-level surgical operations. Different drive signals can be used to meet the requirements of longitudinal vibration and circumferential rotation, providing ultrasonic scalpels with multiple working modes, which is beneficial to cope with different biological tissue cutting situations and reduces the cost of surgical instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of a composite vibration ultrasonic surgical knife in an embodiment of the present invention;

[0018] Figure 2 is a schematic cross-sectional structure diagram of a circumferential rotating assembly in an embodiment of the present invention;

[0019] Figure 3 It is a structural schematic diagram of a stator in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the structure of a rotor in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the circumferentially rotating piezoelectric ceramic in an embodiment of the present invention.

[0022] Description of Figure Numbers:

[0023] 1. Cutter head; 2. Amplitude transformer; 3. End cover assembly; 31. Front cover; 32. Rear cover; 33. Connecting bolts; 4. Longitudinal vibration piezoelectric ceramics; 5. Copper electrode sheet; 6. Mounting base; 61. Mounting groove; 62. Through hole; 7. Circumferential rotation assembly; 71. Stator; 711. Limiting protrusion; 72. Rotor; 721. Contact block; 73. Preload adjustment column; 74. Circumferential rotation piezoelectric ceramics; 75. Preload adjustment bolts; 81. Base end cover.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] like Figures 1 to 5As shown, in one embodiment of the present invention, the composite vibration ultrasonic surgical knife includes a blade head 1, an amplitude transformer 2, an end cover assembly 3, a longitudinal vibration piezoelectric ceramic 4, a copper electrode sheet 5, a mounting base 6, and a circumferential rotation assembly 7, wherein the circumferential rotation assembly 7 includes a circumferential rotation piezoelectric ceramic 74, a stator 71, a rotor 72, and a preload adjustment column 73, wherein one end of the amplitude transformer 2 is detachably connected to the blade head 1, and the other end of the amplitude transformer 2 is connected to the rotor 72, and the rotor 72 is rotatably sleeved on the preload adjustment column 73; the stator 71 is arranged on one side of the mounting base 6, and the other side of the mounting base 6 is connected to the end cover assembly 3, the longitudinal vibration piezoelectric ceramic 4 and the copper electrode sheet 5 are arranged in series on the end cover assembly 3, and the circumferential rotation piezoelectric ceramic 74 is used to excite the friction coupling between the stator 71 and the rotor 72. In the above embodiment, the piezoelectric ceramic realizes the longitudinal vibration effect of the cutter head 1, and the stator 71 and the rotor 72 cooperate to realize the circumferential rotation of the cutter head 1, thereby realizing the effect of the longitudinal and circumferential rotation composite vibration of the cutter head 1, which is beneficial to the lightweight and integration of the ultrasonic scalpel system; improves the cutting efficiency of hard tissue, and also ensures the consistency of the transverse and longitudinal cutting quality of the biological soft tissue blade, which is beneficial to the beauty of the wound and the rapid recovery after surgery, and is also beneficial to a higher level of surgical operation. Different drive signals can be used to meet the requirements of longitudinal vibration and circumferential rotation, providing the ultrasonic scalpel with multiple working modes, which is beneficial to cope with different biological tissue cutting situations and reduces the cost of surgical instruments.

[0031] The ultrasonic surgical blade head 1 is connected to the conical amplitude transformer 2 through threads, and the surgical blade head 1 with the same thread specification can be replaced according to different soft tissues to be cut.

[0032] Among them, the stator 71 is provided with multiple groups of limit protrusions 711 arranged in pairs, there are gaps between the limit protrusions 711 arranged in pairs, and the multiple groups of limit protrusions 711 are arranged at intervals along the circumference of the stator 71; the rotor 72 is provided with multiple contact blocks 721, and the multiple contact blocks 721 are arranged at intervals along the circumference of the rotor 72. The number of contact blocks 721 is consistent with the number of groups of limit protrusions 711 and is arranged one by one. The contact block 721 is arranged between the gaps of two corresponding limit protrusions 711 in the same group. The diameter of the stator 71 is 22mm, and 12 limit protrusions 711 are evenly distributed on the surface, with a height of 2.5mm. The diameter of the rotor 72 is 22mm, and 6 contact blocks 721 are evenly distributed on the surface. When the stator 71 and the rotor 72 are assembled, it is only necessary to clamp the contact block 721 of the rotor 72 in the gap between the two limit protrusions 711 of the stator 71. The stator 71 excites the rotor 72 to frictionally couple between the meshing structures, so that the rotor 72 drives the cutter head 1 to rotate. The sizes of the stator 71 and the rotor 72 and the limiting protrusions 711 and the contact blocks 721 distributed thereon can be selected according to the actual layout space.

[0033] Based on the above embodiment, a plurality of polarity regions are arranged staggered along the circumference of the circumferentially rotating piezoelectric ceramic 74, and the polarities of any two adjacent polarity regions are opposite. The number of polarity regions is consistent with the number of limiting protrusions 711 and is arranged one by one. The inner diameter of the circumferentially rotating piezoelectric ceramic 74 is 8 mm and the outer diameter is 16 mm. There are 12 fan-shaped polarization regions on the piezoelectric ceramic, and the central angle of each polarization region is Π / 6. The polarization directions of each two adjacent polarization regions are opposite; there is an equal-width non-polarized isolation region between adjacent polarization regions. Figure 5 In the figure, "+", "-" indicate the polarization directions are opposite, and no sign indicates that the area is not polarized. Two sinusoidal AC voltage signals are connected to the "+" and "-" areas of the piezoelectric ceramic respectively, the signal frequency is the resonant frequency of the stator 71 material, and the phase difference between the two signals is Π / 2. There is traveling wave excitation on the surface of the stator 71, and the rotor 72 drives the cutter head 1 to rotate through the friction coupling between the meshing structure of the stator 71 and the rotor 72.

[0034] The circumferential rotating assembly 7 also includes a preload adjusting bolt 75. The bottom surface of the preload adjusting bolt 75 contacts the mounting base 6. The bottom end of the preload adjusting bolt 75 is connected to the base through a thread, and the top of the preload adjusting bolt 75 contacts the end surface of the preload adjusting bolt. The bottom surface of the preload adjusting bolt contacts the mounting base 6, and the preload is adjusted by the preload adjusting bolt 75 with a specification of M2×15 to ensure that the stator 71 and the rotor 72 are in close contact.

[0035] The mounting base 6 has a mounting groove 61 at one end facing the cutter head 1, and the stator 71 is fixedly mounted on the bottom wall of the mounting groove 61 by fasteners, and the circumferentially rotating piezoelectric ceramic 74 is attached to the side of the stator 71 facing the bottom wall of the mounting groove 61. The left half of the mounting base 6 with a diameter of 28 mm is solid, and the right half is processed with a mounting groove 61 with a diameter of 23 mm as an assembly space for the stator 71, the rotor 72, etc. The solid part is processed with internal threads of M8×6 and M2×4, and a sinking platform of φ8×3 to connect with other parts of the front and rear of the scalpel mounting base 6. The stator 71 is fixedly connected to the mounting base 6 by screws to prevent movement when traveling waves are generated on the surface of the stator 71. The bottom end of the preload adjustment bolt 75 is connected to the mounting base 6 by threads, and the top limits the position of the preload adjustment column.

[0036] A through hole 62 connected to the mounting groove 61 is provided on the side wall of the mounting base 6, and the through hole is used for passing the power signal line of the circumferentially rotating piezoelectric ceramic 74. Two through holes 62 with a diameter of 1.5 mm are symmetrically processed on the sides of the mounting base 6 at a height of 14 mm from the bottom surface, so as to leave space for the driving signal line of the circumferentially rotating piezoelectric ceramic 74.

[0037] The rotor 72 is rotatably connected to the preload adjustment column 73 through a bearing. A stepped hole is provided in the middle of the rotor 72. The diameter of the small hole of the stepped hole is larger than the diameter of the preload adjustment column 73. The inner ring of the bearing abuts against the end of the preload adjustment column, and the outer ring of the bearing abuts against the stepped surface of the stepped hole. The bearing is a deep groove ball bearing. The inner ring of the deep groove ball bearing is limited by the end of the preload adjustment column, and the outer ring is fixed by the inner step surface of the rotor 72. Therefore, the entire rotating part can be well connected, and the contact pressure of the meshing interface between the stator 71 and the rotor 72 can be changed by adjusting the preload adjustment bolt 75.

[0038] The end cover assembly 3 includes a front cover 31, a rear cover 32 and a connecting bolt 33. The longitudinal vibration piezoelectric ceramic 4 and the copper electrode sheet 5 are clamped between the front cover 31 and the rear cover 32. The connecting bolt 33 passes through the front cover 31, the longitudinal vibration piezoelectric ceramic 4, the copper electrode sheet 5 and the rear cover 32 and is connected to the mounting base 6. The longitudinal vibration piezoelectric ceramic 4 and the copper electrode sheet 5 are in close contact under the preload force of the connecting bolt 33 with a specification of M8×50. The tightness between the longitudinal vibration piezoelectric ceramic 4 and the front cover 31, the rear cover 32 and the mounting base 6 can be changed by adjusting the preload force of the bolt. At different vibration amplitudes, the connecting bolt 33 uses different preload forces.

[0039] Preferably, the connection surface between any two of the front cover 31, the longitudinal vibration piezoelectric ceramic 4, the copper electrode sheet 5 and the rear cover 32 is coated with adhesive. Under the connection of the longitudinal vibration piezoelectric ceramic 4, the front cover 31, the rear cover 32 and the mounting base 6, the central axis remains coincident. To ensure that the device does not fall off under high-frequency composite vibration, adhesive is applied to the bonding surface of each device to play a fixing role.

[0040] The opening edge cover of the mounting groove 61 is provided with a base end cover 81, the mounting base 6 and the stator 71 are connected by three circumferentially evenly distributed stator 71 fixing screws with a specification of M1×8, the base end cover 81 and the mounting base 6 are connected by six circumferentially evenly distributed end cover fixing screws with a specification of M1×5, and the conical amplitude rod 2 and the rotor 72 are connected by six circumferentially evenly distributed amplitude rod 2 fixing screws with a specification of M1×10.

[0041] In order to adapt to the cutting amplitude of different biological tissues, the number of longitudinal vibration piezoelectric ceramics 4 can be changed, and the number is preferably an even number to facilitate the arrangement of the copper electrode sheet 5. When assembling the longitudinal vibration piezoelectric ceramics 4, the same electrodes of adjacent piezoelectric ceramics are allowed to contact each other so that the power signal can be connected in the polarization direction of the piezoelectric ceramics. A sinusoidal signal with a frequency of 40kHz and an amplitude of 220V acts on the longitudinal vibration piezoelectric ceramics 4 (3) polarized along the thickness direction. Under the action of the inverse piezoelectric effect, the piezoelectric ceramics will vibrate longitudinally, and the rear part of the scalpel will also vibrate longitudinally.

[0042] To sum up, by using only two groups of piezoelectric ceramics with different polarization modes and the meshing structure of the stator 71 and the rotor 72, the effect of the longitudinal and circumferential rotation composite vibration of the blade head 1 is achieved, which is beneficial to the lightweight and integration of the ultrasonic scalpel system; the ultrasonic scalpel can achieve composite vibration, improve the cutting efficiency of hard tissue, and ensure the consistency of the transverse and longitudinal cutting quality of the biological soft tissue blade, which is beneficial to the beauty of the wound and the rapid recovery after surgery, and is also beneficial to a higher level of surgical operations; two groups of piezoelectric ceramics with different vibration directions can use different driving signals to meet the requirements of longitudinal vibration and circumferential rotation, providing the ultrasonic scalpel with multiple working modes, which is beneficial to cope with different biological tissue cutting situations and reducing the cost of surgical instruments.

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A composite vibration ultrasonic surgical knife, characterized in that: The composite vibration ultrasonic surgical knife comprises a blade head, an amplitude change rod, an end cover assembly, a longitudinal vibration piezoelectric ceramic, a copper electrode sheet, a mounting base, and a circumferential rotation assembly, wherein the circumferential rotation assembly comprises a circumferential rotation piezoelectric ceramic, a stator, a rotor, and a preload adjustment column, wherein one end of the amplitude change rod is detachably connected to the blade head, and the other end of the amplitude change rod is connected to the rotor, and the rotor is rotatably sleeved on the preload adjustment column; the stator is arranged on the mounting base, and one side of the mounting base is connected to the end cover assembly, the longitudinal vibration piezoelectric ceramic and the copper electrode sheet are arranged in series on the end cover assembly, and the circumferential rotation piezoelectric ceramic is used to excite the friction coupling between the stator and the rotor; the amplitude change rod is conical, and the blade head is connected to the amplitude change rod by threads; The stator is provided with a plurality of groups of limit protrusions arranged in pairs, there are gaps between the limit protrusions arranged in pairs, and the plurality of groups of limit protrusions are arranged at intervals along the circumference of the stator; the rotor is provided with a plurality of contact blocks, the plurality of contact blocks are arranged at intervals along the circumference of the rotor, the number of the contact blocks is consistent with the number of groups of the limit protrusions and are arranged in one-to-one correspondence, and the contact block is arranged between the gaps of two limit protrusions of the same group; The circumferentially rotating piezoelectric ceramic is provided with a plurality of polar regions which are staggeredly arranged along the circumference of the circumferentially rotating piezoelectric ceramic, and the polarities of any two adjacent polar regions are opposite, and the number of the polar regions is consistent with the number of the limiting protrusions and are arranged in a one-to-one correspondence; The circumferential rotation component also includes a preload adjustment bolt, the bottom surface of the preload adjustment column is in contact with the mounting base, the bottom end of the preload adjustment bolt is connected to the base via a thread, and the top of the preload adjustment bolt is in contact with the end surface of the preload adjustment column.

2. The composite vibration ultrasonic surgical knife according to claim 1, characterized in that: The mounting base has an installation groove at one end facing the cutter head, the stator is fixedly mounted on the bottom wall of the installation groove by fasteners, and the circumferentially rotating piezoelectric ceramic is attached to one side of the stator facing the bottom wall of the installation groove.

3. The composite vibration ultrasonic surgical knife according to claim 2, characterized in that: A through hole connected to the mounting groove is provided on the side wall of the mounting base, and the through hole is used for a power signal line of the circumferentially rotating piezoelectric ceramic to pass through.

4. The composite vibration ultrasonic surgical knife according to claim 2, characterized in that: The opening edge cover of the mounting groove is provided with a base end cover.

5. The composite vibration ultrasonic surgical knife according to claim 1, characterized in that: The rotor is rotatably connected to the preload adjustment column via a bearing, a stepped hole is provided in the middle of the rotor, the diameter of the small hole of the stepped hole is larger than the diameter of the preload adjustment column, the inner ring of the bearing abuts against the end of the preload adjustment column, and the outer ring of the bearing abuts against the stepped surface of the stepped hole.

6. The composite vibration ultrasonic surgical knife according to any one of claims 1 to 5, characterized in that: The end cover assembly includes a front end cover, a rear end cover and a connecting bolt, the longitudinal vibration piezoelectric ceramic and the copper electrode sheet are clamped between the front end cover and the rear end cover, and the connecting bolt passes through the front end cover, the longitudinal vibration piezoelectric ceramic, the copper electrode sheet and the rear end cover and is connected to the mounting base.

7. The composite vibration ultrasonic surgical knife according to claim 6, characterized in that: Adhesive is applied to the connection surface between any two of the front end cover, the longitudinal vibration piezoelectric ceramic, the copper electrode sheet and the rear end cover.

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