Transducer assembly and ultrasonic scalpel

Abstract

The transducer assembly comprises a transducer and a transducer shell which are oppositely and fixedly arranged, the transducer shell comprises a front shell, a middle shell, a rear shell and a current-conducting plate, and a closed cavity is formed among the current-conducting plate, the rear shell, the middle shell, the front shell and a flange plate; a closed cavity is formed in the front shell and the rear shell, a main body part of the transducer is accommodated in the closed cavity, the front shell and the rear shell are both made of hard materials, the middle shell is made of flexible and deformable materials, a through hole communicated with the closed cavity is further formed in the transducer shell, and a waterproof breathable film covers the through hole. Thus, a plurality of elastic components do not need to be arranged between the transducer and the transducer shell, vacuum disinfection treatment of the transducer assembly is not affected, meanwhile, the overall weight of the transducer assembly and the handle provided with the transducer assembly is reduced, and the hand operation burden of an operation operator is relieved.

Description

Technical Field

[0001] The invention relates to the field of ultrasonic scalpel manufacturing, and in particular to a transducer assembly and an ultrasonic scalpel. Background Art

[0002] Ultrasonic Scalpel (also known as ultrasonic knife or ultrasonic hemostatic knife) is an advanced medical device widely used in surgical operations. Its working principle is based on high-frequency ultrasonic vibration, which can accurately cut tissue and reduce bleeding at the same time. It is an indispensable tool in modern minimally invasive surgery. The core part of the ultrasonic scalpel is the transducer, which can convert electrical energy into mechanical energy and generate high-frequency vibration (usually around 55,000 Hz). This high-frequency vibration is transmitted to the surgical site through a special blade, allowing the blade to cut tissue gently and accurately. Ultrasonic scalpels can not only cut tissue, but also have coagulation function. During the cutting process, the high-frequency vibration of the blade can close the blood vessels, thereby reducing bleeding.

[0003] The transducer usually forms a transducer assembly together with the transducer housing, and is integrally installed in the handle housing of the ultrasonic scalpel, wherein the horn of the transducer is used to generate vibration, and the transducer housing is used to protect the transducer. At the same time, the horn can be rotated by rotating the transducer housing, that is, the transducer housing and the transducer are relatively fixed.

[0004] In existing ultrasonic surgical knives, the transducer housing is usually made of metal to adapt to the environment of high temperature or vacuum sterilization. Since the metal housing is hard, multiple elastic components need to be arranged between the metal housing and the transducer to reduce the interference of the metal housing on the vibration of the horn, which makes the installation process more complicated. At the same time, the weight of the entire ultrasonic surgical knife is relatively heavy, which is a heavy burden during long-term surgical operations. Summary of the invention

[0005] An object of the present invention is to provide a transducer assembly to solve one or more problems of the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a transducer assembly, including a relatively fixed transducer and a transducer housing, the transducer including a front portion of a horn, a flange and a rear portion of the horn connected in sequence from front to back along the axial direction, the outer diameter of the flange is larger than the outer diameter of the rear portion of the horn and the outer diameter of the front portion of the horn, the transducer housing includes a front housing, a middle housing, a rear housing and a conductive plate, the middle housing is sealedly connected between the front housing and the rear housing, the conductive plate is fixedly arranged on the rear housing The rear part, the front part of the middle shell or the front shell is cooperatively sleeved on the outer periphery of the flange, and a closed chamber is formed among the conductive plate, the rear shell, the middle shell, the front shell and the flange, and the rear part of the amplitude transformer is accommodated in the closed chamber and is electrically connected to the conductive plate, wherein the front shell and the rear shell are both made of hard materials, the middle shell is made of flexible and deformable materials, and the transducer housing is also provided with a through hole connected to the closed chamber, and the through hole is covered with a waterproof and breathable membrane.

[0007] In some embodiments, the middle shell has a hollow cavity extending axially therethrough, the front shell is sleeved on the front portion of the middle shell, and the inner circumferential cavity wall of the front shell is sealed with the outer circumferential cavity wall of the middle shell; the rear portion of the middle shell is sleeved on the front portion of the rear shell, and the outer circumferential cavity wall of the rear shell is sealed with the inner circumferential cavity wall of the middle shell; the conductive plate is fixedly disposed on the rear portion of the rear shell, and the conductive plate is sealed with the rear end face of the rear shell.

[0008] In some embodiments, the middle shell is integrally formed on one of the front shell and the rear shell, a sealant layer is provided between the other of the front shell and the rear shell and the middle shell, and the sealant layer is used to achieve mutual fixation and sealing; Alternatively, a sealant layer is provided between the inner cavity wall of the front shell and the outer peripheral wall of the middle shell, and between the outer peripheral wall of the rear shell and the inner cavity wall of the middle shell to achieve mutual fixation and sealing.

[0009] In some embodiments, the middle shell has a first cylinder, a second cylinder and a third cylinder connected in sequence from front to back, the cross-section of at least part of the first cylinder and the cross-section of at least part of the inner cavity of the front shell are the same as the cross-section of the flange and are all non-circular, the first cylinder is integrally attached to the inner cavity wall of the front shell, and the first cylinder is sleeved on the flange; the front part of the rear shell is cooperatively inserted into the inner cavity of the third cylinder.

[0010] In some embodiments, the inner cavity cross-section of the third cylinder is circular, the second cylinder has a cylinder body and a connecting portion, the cylinder body extends backward from the rear of the first cylinder, the inner cavity of the cylinder body has the same cross-sectional shape as the inner cavity of the first cylinder, and the size gradually decreases from front to back; the connecting portion is connected between the third cylinder and the cylinder body, and the connecting portion is a cone with a small front and a large back.

[0011] In some embodiments, the rear shell includes a mounting cylinder portion and an end cover portion, the outer diameter of the end cover portion is larger than the outer diameter of the mounting cylinder portion, the rear portion of the middle shell is fittedly sleeved on the outer circumference of the mounting cylinder portion, the outer circumference of the mounting cylinder portion is provided with a plurality of axially spaced annular ribs, and the conductive plate is fixedly connected to the rear end surface of the mounting cylinder portion.

[0012] In some embodiments, a limiting portion is further provided at the front portion of the front shell, and the limiting portion has a through hole for the front portion of the amplitude transformer to pass through in the axial direction, and the flange is located behind the limiting portion.

[0013] In some embodiments, sealant is provided between the conductive plate and the rear portion of the rear shell, so that the front end surface of the conductive plate and the rear end surface of the rear shell are sealed and connected, and / or sealant is provided between the limiting portion and the flange.

[0014] In some embodiments, the middle shell is made of flexible plastic or silicone material or rubber material, and the front shell and the rear shell are both made of hard plastic.

[0015] In some embodiments, the conductive plate includes a plate body, the through-hole is provided on the plate body and penetrates the plate body in a front-to-back direction, and the waterproof breathable membrane is fixed on the plate body and covers the through-hole.

[0016] In some embodiments, the conductive plate includes a conductive member fixed on the plate body, the conductive member includes a first conductive portion and a second conductive portion that are insulated from each other, the first conductive portion is annular and is arranged on the outer periphery of the second conductive portion, and there are more than two through holes arranged at intervals, and the through holes are located on the plate body between the first conductive portion and the second conductive portion.

[0017] In some embodiments, the plate body is provided with more than two of the through holes, the front side of each of the through holes is covered with a waterproof breathable membrane, and the circumferential edge of the waterproof breathable membrane is sealedly connected to the front end surface of the plate body.

[0018] Another object of the present invention is to provide an ultrasonic surgical knife, comprising a handle and a knife, wherein the handle comprises a handle shell and a transducer assembly as described above arranged in an inner cavity of the handle shell.

[0019] Due to the application of the above technical solution, the present invention has the following advantages: in the transducer assembly provided by the present invention, the front shell and the rear shell are connected by a middle shell made of a soft and deformable material. When the transducer is installed in the transducer housing, there is no need to set up multiple elastic components to reduce the influence of the transducer housing on the vibration of the amplitude transformer, so that the whole structure is simpler and the production and installation process is more convenient; when the transducer assembly is vacuumed and disinfected, the transducer housing will not be deformed or damaged. At the same time, the overall weight of the transducer assembly and the handle installed thereon is reduced, thereby reducing the hand operation burden of the surgical operator.

[0020] The ultrasonic surgical knife provided by the present invention includes all technical solutions of the transducer assembly, and therefore it necessarily has all technical advantages of the transducer assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of a transducer assembly according to an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of a structural breakdown of a transducer assembly; Figure 3 for Figure 1 A schematic front view of the structure of the transducer assembly; Figure 4 For along Figure 3 AA-direction cross-sectional structural diagram; Figure 5 for Figure 1 A left-side structural schematic diagram of a transducer assembly; Figure 6 for Figure 1 A schematic diagram of the structure of a transducer assembly after the conductive plate is removed; Figure 7 It is a schematic diagram of the overall structure of an ultrasonic surgical knife according to an embodiment of the present invention; In the above attached figure: 1. front shell; 11. limiting part; 12. positioning part; 2. middle shell; 21. first cylinder; 21a. matching part; 22. second cylinder; 22a. cylinder body; 22b. connecting part; 23. third cylinder; 3. rear shell; 31. mounting tube; 31a. annular rib; 31b. avoidance groove; 32. end cover; 33. positioning protrusion; 4. Conductive plate; 41. Plate body; 41a. Connection hole; 41b. Perforation; 42. Waterproof breathable membrane; 43. Conductive member; 43a. First conductive part; 43b. Second conductive part; 5. Transducer; 51. Flange; 52. Rear part of horn; 53. Front part of horn; 53a. Connecting screws; 6. Conductive wire; 100. handle; 101. handle housing; 200. tool; 10. transducer assembly. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Figures 1 to 6 The drawings are drawn in true proportion. To keep the specification concise, the proportions of each component are not listed one by one. However, the proportions and positions of each component should be regarded as part of the content of this specification.

[0025] It should be noted that the following description of the front-to-back direction is defined based on the direction observed by the surgeon when the ultrasonic scalpel is used for surgical operation, and its purpose is only to clearly illustrate the relative position relationship of the transducer assembly and the various components in the ultrasonic scalpel.

[0026] See also Figure 7 The ultrasonic surgical knife shown includes a handle 100 and a cutter 200. The handle 100 includes a handle shell 101 and a transducer assembly 10 arranged in the inner cavity of the handle shell 101. The cutter 200 is connected to the front part of the handle 100. The cutter rod in the cutter 200 is connected to the transducer assembly 10 in the inner cavity of the handle shell 101.

[0027] See also Figures 1 to 6The transducer assembly 10 shown includes a relatively fixed transducer 5 and a transducer housing. The transducer 5 includes a front portion 53 of a transformer, a flange 51 and a rear portion 52 of the transformer, which are connected in sequence from front to back along the axial direction. The outer diameter of the flange 51 is larger than the outer diameter of the rear portion 52 of the transformer and the outer diameter of the front portion 53 of the transformer. A connecting screw 53a is provided at the front end of the front portion 53 of the transformer for connecting with the blade of an ultrasonic surgical knife. The rear portion 52 of the transformer has core components and circuit elements of the transducer 5. The transducer housing is mainly used to enclose the rear portion 52 of the transformer and other structures installed thereon, and to fix the transducer 5 thereto. The installation of the transducer assembly 10 in the handle housing 101 is achieved by connecting the transducer housing and the handle housing 101.

[0028] See also Figures 1 to 6 As shown, the transducer housing includes a front housing 1, a middle housing 2, a rear housing 3 and a conductive plate 4, wherein the middle housing 2 is sealedly connected between the front housing 1 and the rear housing 3, the conductive plate 4 is fixedly arranged at the rear of the rear housing 3, and the front of the middle housing 2 or the front housing 1 is cooperatively sleeved on the outer periphery of the flange 51, so that a closed chamber is formed between the conductive plate 4, the rear housing 3, the middle housing 2, the front housing 1 and the flange 51, and the rear part 52 of the horn is accommodated in the sealed space and electrically connected to the conductive plate 4, wherein the front housing 1 and the rear housing 3 are both made of hard materials, the middle housing 2 is made of flexible and deformable materials, and the hardness of the front housing 1 and the rear housing 3 are both greater than the hardness of the middle housing 2. The transducer housing is also provided with a through hole 41b connected to the above-mentioned closed chamber, and the through hole 41b is covered with a waterproof and breathable membrane 42.

[0029] Thus, in the transducer assembly 10, on the one hand, the middle shell 2 made of a flexible and deformable material is connected between the front shell 1 and the rear shell 3, so that the vibration between the front shell 1 and the rear shell 3 can be fully buffered, so that the rear shell 3 has almost no effect on the vibration of the front part 53 of the amplitude transformer; at the same time, the middle shell 2 is made of a flexible material, which is lighter than traditional metal materials, so that the overall weight of the transducer assembly 10 is greatly reduced compared with the existing transducer assembly with an integral metal shell, thereby reducing the overall weight of the handle 100 and alleviating the hand operation burden of the surgical operator; on the other hand, because the waterproof and breathable membrane 42 is breathable and waterproof, it can prevent liquid from entering the closed chamber of the transducer assembly 10 through the perforation 41b, and at the same time can make the above-mentioned closed chamber connected to the external airflow. In this way, a vacuum operation can be performed when the handle 100 of the ultrasonic scalpel is sterilized. During the vacuum operation, the middle shell 2 will not expand outward under the action of pressure due to the pressure difference inside and outside the closed chamber, thereby preventing the transducer housing from being deformed and losing protection for the rear part 52 of the horn.

[0030] See also Figures 1 to 6As shown, in the transducer assembly 10 of this embodiment, the middle shell 2 has a hollow cavity extending axially therethrough, the front shell 1 is sleeved on the front portion of the middle shell 2, and the inner circumferential cavity wall of the front shell 1 and the outer circumferential cavity wall of the middle shell 2 are sealed; the rear portion of the middle shell 2 is sleeved on the front portion of the rear shell 3, and the outer circumferential cavity wall of the rear shell 3 and the inner circumferential cavity wall of the middle shell 2 are sealed; the conductive plate 4 is fixedly arranged on the rear portion of the rear shell 3, and the conductive plate 4 and the rear end face of the rear shell 3 are sealed.

[0031] Specifically, the middle shell 2 can be made of silicone material, or can be made of flexible plastic or rubber, such as thermoplastic elastomer, or nitrile rubber. In this embodiment, the middle shell 2 is a flexible tube made of flexible plastic material, and the front shell 1 and the rear shell 3 are both made of hard plastic material. The material of the middle shell 2 is mainly selected from TPU (thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber) and / or TPE (thermoplastic elastomer, also known as artificial rubber or synthetic rubber), which has a certain flexibility; the material of the front shell 1 and the rear shell 3 is mainly selected from at least one of PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene plastic), PI (polyimide), PA (polyamide), PMMA (polymethyl methacrylate), POM (polyoxymethylene) and PTFE (polytetrafluoroethylene). In this way, the overall weight of the transducer housing is lighter than that of the traditional integral metal housing, further reducing the overall weight of the handle 100.

[0032] The middle shell 2 can be integrally arranged on one of the front shell 1 and the rear shell 3, and a sealant layer is arranged between the other of the front shell 1 and the rear shell 3 and the middle shell 2, and the sealant layer is used to achieve mutual fixation and sealing connection; the middle shell 2 can also be mutually fixed and sealed to the front shell 1 and the rear shell 3 through the sealant layer, that is, a sealant layer is respectively arranged between the inner cavity wall of the front shell 1 and the outer peripheral wall of the middle shell 2, and between the outer peripheral wall of the rear shell 3 and the inner cavity wall of the middle shell 2 to achieve mutual fixation and sealing. In this embodiment, the front part of the middle shell 2 is integrally formed on the front shell 1, that is, the middle shell 2 and the front shell 1 form an integral component and are assembled with the transducer 5 and the rear shell 3, which is not only convenient for assembly, but also ensures the reliability of the sealing connection between the front shell 1 and the middle shell 2.

[0033] The middle shell 2 has a first cylinder 21, a second cylinder 22 and a third cylinder 23 which are connected in sequence from front to back. The front shell 1 is fitted on the outer periphery of the first cylinder 21, and the first cylinder 21 is fitted on the flange 51. The cross-section of the flange 51 is non-circular, and can be specifically set to a polygon. The cross-section of at least part of the first cylinder 21 and the cross-section of at least part of the inner cavity of the front shell 1 are the same as the cross-sectional shape of the flange 51. This allows the front shell 1, the middle shell 2 and the flange 51 to be fixed relative to the flange 51 in the circumferential direction after fitting together to avoid relative rotation between each other. In this way, when the transducer housing rotates, the transducer 5 can rotate synchronously therewith.

[0034] Here, a plurality of positioning portions 12 are further provided at the rear portion of the front shell 1, and the positioning portions 12 are specifically positioning grooves connected to the inner cavity of the front shell 1. A matching portion 21a is also provided on the outer peripheral portion of the first cylinder 21. The matching portion 21a protrudes outward from the outer peripheral wall of the first cylinder 21 and can be inserted into the plurality of positioning portions 12 one by one, which makes the combination between the front shell 1 and the middle shell 2 more stable and reliable.

[0035] The front part of the front shell 1 is also provided with a limiting part 11, which has a through hole for the front part 53 of the horn to pass through in the axial direction. The limiting part 11 is located in the inner cavity of the front shell 1 and the flange 51 is located behind the limiting part 11. The axial limiting between the transducer 5 and the transducer housing is achieved through the cooperation between the limiting part 11 and the flange 51. A sealant is also provided between the end faces where the limiting part 11 and the flange 51 meet, so that the flange 51 and the limiting part 11 of the front shell 1 are further relatively fixed and sealed.

[0036] The front part of the rear shell 3 is inserted into the inner cavity of the third barrel 23 in a matching manner. Here, the inner cavity cross section of the third barrel 23 is specifically set to be circular. The second barrel 22 has a barrel body 22a and a connecting portion 22b. The barrel body 22a extends backward from the rear of the first barrel 21. The inner cavity of the barrel body 22a has the same cross-sectional shape as the inner cavity of the first barrel 21, and the size gradually decreases from front to back, which makes the middle shell 2 easier to form during molding; the connecting portion 22b is connected between the third barrel 23 and the barrel body 22a, and the connecting portion 22b is a cone with a small front and a large back. Of course, in other embodiments, the second barrel 22 can also be set to other shapes, for example, the front inner cavity of the barrel body 22a has the same cross-sectional shape as the inner cavity of the first barrel 21, and the rear inner cavity is a circle with a gradually decreasing diameter, and so on.

[0037] The rear shell 3 includes a mounting cylinder 31 and an end cover 32. The outer diameter of the end cover 32 is larger than the outer diameter of the mounting cylinder 31. The rear portion of the middle shell 2 is sleeved on the outer peripheral portion of the mounting cylinder 31. The conductive plate 4 is fixedly connected to the rear end surface of the mounting cylinder 31. A plurality of annular convex ribs 31a spaced apart along the axial direction are also provided on the outer peripheral portion of the mounting cylinder 31. When the mounting cylinder 31 is inserted into the inner cavity of the connecting portion 22b, the cooperation between the annular convex ribs 31a and the circumferential cavity wall of the connecting portion 22b not only makes the connection between the two closer, but also allows a sealing layer to be placed between two adjacent annular convex ribs 31a, further improving the sealing performance between the two.

[0038] As shown in the drawings, in the transducer assembly 10, the through hole 41b and the waterproof breathable membrane 42 are provided on the conductive plate 4. Specifically, the conductive plate 4 includes a plate body 41, and the plate body 41 and the rear shell 3 can be provided integrally, or can be fixedly connected to the rear end of the rear shell 3 and sealed to the rear end surface of the rear shell 3 as in the present embodiment. The through hole 41b is opened on the plate body 41 and penetrates the plate body 41 along the thickness direction, and the waterproof breathable membrane 42 is fixed on the front end surface of the plate body 41 and covers the front side of the through hole 41b.

[0039] Specifically, the conductive plate 4 also includes a conductive member 43, which is used to electrically connect to an external power connection element, so that when the transducer assembly 10 rotates around its own axis to any angle, the conductive member 43 can maintain electrical connection with the above-mentioned power connection element. Here, the conductive member 43 is in the shape of a thin plate as a whole, and is fixedly arranged on the rear end of the plate body 41 and its rear end surface is flush with the rear end surface of the plate body 41. Specifically, the conductive member 43 includes a first conductive portion 43a and a second conductive portion 43b that are insulated from each other, the first conductive portion 43a is in the shape of a ring, and the second conductive portion 43b is in the shape of a ring or a disc as shown in this embodiment, and the first conductive portion 43a is coaxially arranged on the circumferential outer side of the second conductive portion 43b.

[0040] In this embodiment, the plate body 41 is provided with more than two through holes 41b, each of which is covered with a waterproof breathable membrane 42, and the circumferential edges of all the waterproof breathable membranes 42 are sealedly connected to the front end surface of the plate body 41. Here, the two through holes 41b are arranged at intervals and are located between the first conductive portion 43a and the second conductive portion 43b.

[0041] In the present embodiment, the plate body 41 of the conductive plate 4 is specifically a PCB board, which is disc-shaped as a whole, and a plurality of connection holes 41a are arranged at intervals on its outer periphery, and a plurality of positioning protrusions 33 are correspondingly arranged at the rear end of the rear shell 3. When the conductive plate 4 is connected to the rear end of the rear shell 3, sealant is first applied between the front side surfaces of the conductive plate 4, and then the plurality of connection holes 41a are matched with the plurality of positioning protrusions 33 one by one, so that the conductive plate 4 is positioned correspondingly to the rear shell 3, and the front side surface of the conductive plate 4 is fixed to the rear end surface of the rear shell 3 by means of sealant, so that the conductive plate 4 is fixed to the rear shell 3 and is sealed with the rear shell 3, so that the rear shell 3 is closed at the rear end.

[0042] The rear shell 3 is also provided with two avoidance grooves 31b extending axially therethrough. The rear portion 52 of the amplitude rod of the transducer 5 is electrically connected to the first conductive portion 43a and the second conductive portion 43b of the conductive plate 4 through two conductive wires 6. The above-mentioned two conductive wires 6 are respectively accommodated in the two avoidance grooves 31b.

[0043] Exemplarily, the transducer assembly 10 of the present embodiment can be assembled in the following manner: the front portion 53 of the amplitude transformer of the transducer 5 is inserted from the rear of the middle shell 2 into the inner cavity thereof, and passes through the through hole at the front of the front shell 1, so that the middle shell 2 is fittedly sleeved on the outer peripheral portion of the flange 51, and the flange 51 is fitted forwardly with the limiting portion 11 to achieve axial limiting; the two conductive wires 6 are respectively inserted into the two avoidance grooves 31b of the rear shell 3, and then a sealant is arranged on the outer peripheral portion of the rear shell 3, and the front portion of the rear shell 3 is inserted forwardly into the inner cavity of the third cylinder 23 of the middle shell 2, and the sealant is cured between the rear shell 3 and the middle shell 2 to form a sealant layer, so that the rear shell 3 and the middle shell 2 are fixed and sealed to each other; the conductive plate 4 is electrically connected to the transducer 5 through the two conductive wires 6, and then the sealant is coated on the front end surface of the conductive plate 4, and then it is positioned to the rear end portion of the rear shell 3, so that the conductive plate 4 and the rear shell 3 are sealed and fixedly connected to each other.

[0044] In summary, the transducer assembly 10 provided in this embodiment has a transducer housing divided into a front housing 1, a middle housing 2 and a rear housing 3. The rear housing 3 is connected to the front housing 1 by a flexible and deformable middle housing 2, so that the rear housing 3 has almost no effect on the vibration of the front part 53 of the horn, and there is no need to set up multiple elastic components to reduce the effect of the transducer housing on the vibration of the front part 53 of the horn, so that the entire structure is simpler, and the production and installation process is more convenient. When the handle 100 of the ultrasonic scalpel equipped with the modified transducer assembly 10 is sterilized, a vacuum operation can be performed. When the vacuum operation is performed, the middle housing 2 will not expand outward under the action of pressure due to the pressure difference inside and outside the closed chamber, thereby avoiding deformation and failure of the transducer housing. At the same time, the setting of the transducer housing in this embodiment also greatly reduces the overall weight of the transducer assembly 10 compared with the existing transducer assembly with an integral metal housing, which reduces the burden of hand operation of the surgical operator and is conducive to the implementation of delicate surgery.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A transducer assembly, comprising a relatively fixed transducer and a transducer housing, wherein the transducer comprises a front portion of a horn, a flange and a rear portion of the horn connected in sequence from front to rear along the axial direction, wherein the outer diameter of the flange is larger than the outer diameter of the rear portion of the horn and the outer diameter of the front portion of the horn, and wherein: The transducer housing comprises a front shell, a middle shell, a rear shell and a conductive plate, wherein the middle shell is sealingly connected between the front shell and the rear shell, the conductive plate is fixedly arranged at the rear of the rear shell, the front of the middle shell or the front shell is cooperatively sleeved on the outer periphery of the flange, a closed chamber is formed among the conductive plate, the rear shell, the middle shell, the front shell and the flange, the rear part of the amplitude transformer is accommodated in the closed chamber and is electrically connected to the conductive plate, wherein the front shell and the rear shell are both made of hard materials, the middle shell is made of flexible and deformable materials, and the transducer housing is also provided with a through hole connected to the closed chamber, and the through hole is covered with a waterproof and breathable membrane.

2. The transducer assembly according to claim 1, characterized in that: The middle shell has a hollow cavity extending axially therethrough; the front shell is sleeved on the front portion of the middle shell, and the inner circumferential cavity wall of the front shell is sealed with the outer circumferential cavity wall of the middle shell; the rear portion of the middle shell is sleeved on the front portion of the rear shell, and the outer circumferential cavity wall of the rear shell is sealed with the inner circumferential cavity wall of the middle shell; the conductive plate is fixedly disposed on the rear portion of the rear shell, and the conductive plate is sealed with the rear end face of the rear shell.

3. The transducer assembly according to claim 2, characterized in that: The middle shell is integrally formed and arranged on one of the front shell and the rear shell, a sealant layer is arranged between the other of the front shell and the rear shell and the middle shell, and the sealant layer is used to achieve mutual fixation and sealing; Alternatively, a sealant layer is provided between the inner cavity wall of the front shell and the outer peripheral wall of the middle shell, and between the outer peripheral wall of the rear shell and the inner cavity wall of the middle shell to achieve mutual fixation and sealing.

4. The transducer assembly according to claim 2, characterized in that: The middle shell comprises a first cylinder, a second cylinder and a third cylinder which are connected in sequence from front to back. The cross-section of at least part of the first cylinder and the cross-section of at least part of the inner cavity of the front shell are the same as the cross-section of the flange and are all non-circular. The first cylinder is integrally attached to the inner cavity wall of the front shell, and the first cylinder is sleeved on the flange; the front part of the rear shell is cooperatively inserted into the inner cavity of the third cylinder.

5. The transducer assembly according to claim 4, characterized in that: The inner cavity cross-section of the third cylinder is circular, and the second cylinder has a cylinder body and a connecting portion. The cylinder body extends backward from the rear of the first cylinder, and the inner cavity of the cylinder body has the same cross-sectional shape as the inner cavity of the first cylinder, and the size gradually decreases from front to back; the connecting portion is connected between the third cylinder and the cylinder body, and the connecting portion is a cone with a small front and a large back.

6. The transducer assembly according to claim 2, characterized in that: The rear shell includes a mounting cylinder and an end cover, the outer diameter of the end cover is larger than the outer diameter of the mounting cylinder, the rear portion of the middle shell is fittedly sleeved on the outer circumference of the mounting cylinder, the outer circumference of the mounting cylinder is provided with a plurality of axially spaced annular ribs, and the conductive plate is fixedly connected to the rear end surface of the mounting cylinder.

7. The transducer assembly according to claim 2, characterized in that: The front part of the front shell is also provided with a limiting part, and the limiting part has a through hole for the front part of the amplitude transformer to pass through in the axial direction, and the flange is located behind the limiting part.

8. The transducer assembly according to claim 7, characterized in that: A sealant is provided between the conductive plate and the rear portion of the rear shell, so that the front end surface of the conductive plate and the rear end surface of the rear shell are sealed and connected, and / or a sealant is provided between the limiting portion and the flange.

9. The transducer assembly according to claim 1, characterized in that: The middle shell is made of flexible plastic or silicone or rubber, and the front shell and the rear shell are both made of hard plastic.

10. The transducer assembly according to claim 1, characterized in that: The conductive plate comprises a plate body, the through hole is arranged on the plate body and penetrates the plate body in the front-rear direction, and the waterproof breathable membrane is fixed on the plate body and covers the through hole.

11. The transducer assembly according to claim 10, characterized in that: The conductive plate includes a conductive member fixed on the plate body, the conductive member includes a first conductive part and a second conductive part insulated from each other, the first conductive part is annular and is arranged on the outer periphery of the second conductive part, there are more than two through holes arranged at intervals, and the through holes are located between the first conductive part and the second conductive part on the plate body.

12. The transducer assembly according to claim 10, characterized in that: The plate body is provided with more than two through holes, and the front side of each through hole is covered with a waterproof breathable membrane, and the circumferential edge of the waterproof breathable membrane is sealedly connected to the front end surface of the plate body.

13. An ultrasonic surgical knife, comprising a handle and a knife, characterized in that: The handle comprises a handle shell and a transducer assembly according to any one of claims 1 to 12 arranged in an inner cavity of the handle shell.

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