Transducer assembly and ultrasonic surgical knife

Abstract

The present invention relates to a transducer assembly and an ultrasonic surgical knife, wherein the transducer assembly comprises a relatively fixed transducer and a transducer housing, wherein the transducer housing comprises a front housing, a middle housing, a rear housing and a conductive plate, wherein a closed chamber is formed between the conductive plate, the rear housing, the middle housing, the front housing and the flange, wherein the main body of the transducer is accommodated in the closed chamber, wherein the front housing and the rear housing are both made of hard materials, the middle housing is made of flexible and deformable materials, and the transducer housing is also provided with a through hole connected to the closed chamber, wherein the through hole is covered with a waterproof and breathable membrane. In this way, it is not necessary to set a plurality of elastic components between the transducer and the transducer housing, and the vacuum disinfection treatment of the transducer assembly is not affected, and the overall weight of the transducer assembly and the handle installed thereon is reduced, thereby alleviating the burden of hand operation of the surgical operator.

Description

Technical Field

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

[0002] The ultrasonic scalpel (also known as an ultrasonic scalpel or ultrasonic hemostatic scalpel) is an advanced medical device widely used in surgical procedures. It operates based on high-frequency ultrasonic vibrations, enabling precise tissue cutting while minimizing bleeding, making it an indispensable tool in modern minimally invasive surgery. The core component of an ultrasonic scalpel is the transducer, which converts electrical energy into mechanical energy, generating high-frequency vibrations (typically around 55,000 Hz). These high-frequency vibrations are transmitted to the surgical site via a specialized blade tip, enabling the tip to gently and precisely cut tissue. Ultrasonic scalpels not only cut tissue but also have a coagulation function. During the cutting process, the high-frequency vibrations of the blade tip seal blood vessels, thereby minimizing 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. 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 to say, the transducer housing and the transducer are relatively fixed.

[0004] In existing ultrasonic surgical blades, the transducer housing is typically made of metal to withstand high-temperature or vacuum sterilization environments. Because the metal housing is relatively rigid, multiple elastic components are required between the metal housing and the transducer to reduce the metal housing's interference with the vibration of the horn. This complicates the installation process and also makes the entire ultrasonic surgical blade relatively heavy, making it a burden during prolonged surgical procedures. Summary of the Invention

[0005] An object of the present invention is to provide a transducer assembly that solves 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, 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 back along the axial direction, the outer diameter of the flange being 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 comprising a front shell, a middle shell, a rear shell and a conductive plate, the middle shell being sealed between the front shell and the rear shell, the conductive plate being fixedly arranged on the rear shell 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 between 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 electrically connected to the conductive plate, wherein the front shell and the rear shell are both made of hard material, and the middle shell is made of flexible and deformable material, and the transducer housing is further 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 a seal is formed between the inner circumferential cavity wall of the front shell and 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 a seal is formed between the outer circumferential cavity wall of the rear shell and 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 to 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, and 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;

[0009] 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.

[0010] 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.

[0011] 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 smaller front and a larger back.

[0012] In some embodiments, 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 fitted over the outer periphery of the mounting cylinder, the outer periphery 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 face of the mounting cylinder.

[0013] 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.

[0014] 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 / or sealant is provided between the limiting portion and the flange.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the conductive plate includes a conductive part fixed on the plate body, the conductive part includes a first conductive part and a second conductive part that are insulated from each other, the first conductive part is annular and is arranged on the outer periphery of the second conductive part, and 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.

[0018] In some embodiments, the plate body is provided with two or more 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.

[0019] 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 the transducer assembly as described above arranged in an inner cavity of the handle shell.

[0020] 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 soft and deformable material. When the transducer is installed in the transducer housing, there is no need to set multiple elastic components to reduce the influence of the transducer housing on the vibration of the amplitude transformer, making the entire structure simpler and the production and installation process 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, reducing the hand operation burden of the surgical operator.

[0021] 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

[0022] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. 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 these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the overall structure of a transducer assembly according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structural decomposition of the transducer assembly;

[0025] Figure 3 for Figure 1 A schematic front view of the structure of the transducer assembly;

[0026] Figure 4 For the Figure 3 AA-axis cross-sectional structural diagram;

[0027] Figure 5 for Figure 1 A left-side structural schematic diagram of a transducer assembly;

[0028] Figure 6 for Figure 1 A schematic diagram of the structure of the transducer assembly after the conductive plate is removed;

[0029] Figure 7 This is a schematic diagram of the overall structure of an ultrasonic surgical knife according to an embodiment of the present invention;

[0030] In the above attached figures:

[0031] 1. Front shell; 11. Limiting part; 12. Positioning part;

[0032] 2. Middle shell; 21. First cylinder; 21a. Fitting portion; 22. Second cylinder; 22a. Cylinder body; 22b. Connecting portion; 23. Third cylinder;

[0033] 3. Rear shell; 31. Mounting tube; 31a. Annular rib; 31b. Avoidance groove; 32. End cover; 33. Positioning protrusion;

[0034] 4. Conductive plate; 41. Plate body; 41a. Connection hole; 41b. Perforation; 42. Waterproof and breathable membrane; 43. Conductive member; 43a. First conductive portion; 43b. Second conductive portion;

[0035] 5. Transducer; 51. Flange; 52. Rear of horn; 53. Front of horn; 53a. Connecting screws;

[0036] 6. Conductive wire;

[0037] 100. Handle; 101. Handle housing; 200. Cutting tool; 10. Transducer assembly. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings to make the advantages and features of the present invention more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and 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 may be combined with each other as long as they do not conflict with each other.

[0039] Figures 1 to 6 The figures are drawn in true proportion. To keep the description concise, the proportions of each component are not listed one by one. However, the proportions and positions of each component should be considered as part of the content of this description.

[0040] 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. The purpose is only to clearly illustrate the relative position relationship of the transducer assembly and the various components in the ultrasonic scalpel.

[0041] 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 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.

[0042] 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 the horn, a flange 51 and a rear portion 52 of the horn, 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 horn and the outer diameter of the front portion 53 of the horn. The front end of the front portion 53 of the horn is provided with a connecting screw 53a for connecting to the knife rod of the ultrasonic surgical knife; the rear portion 52 of the horn has the core components and circuit elements of the transducer 5. The transducer housing is mainly used to enclose the rear portion 52 of the horn and other structures installed thereon, and to fix it to the transducer 5. The installation of the transducer assembly 10 in the handle housing 101 is achieved by connecting the transducer housing and the handle housing 101.

[0043] 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. The middle housing 2 is sealed 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. The front portion of the middle housing 2 or the front housing 1 is cooperatively sleeved on the outer periphery of the flange 51, so that a sealed chamber is formed between the conductive plate 4, the rear housing 3, the middle housing 2, the front housing 1, and the flange 51. The rear portion 52 of the horn is accommodated in this sealed space and is electrically connected to the conductive plate 4. The front housing 1 and the rear housing 3 are both made of hard materials, and the middle housing 2 is made of flexible and deformable materials. The hardness of the front housing 1 and the rear housing 3 is greater than that of the middle housing 2. The transducer housing is also provided with a through-hole 41b connected to the above-mentioned sealed chamber. The through-hole 41b is covered with a waterproof and breathable membrane 42.

[0044] 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, since 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 sterilizing the handle 100 of the ultrasonic scalpel. During the vacuum operation, the middle shell 2 will not expand outward under the action of pressure due to the pressure difference between the inside and outside of the closed chamber, thereby avoiding deformation of the transducer housing and loss of protection for the rear part 52 of the horn.

[0045] 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 a seal is formed between the inner circumferential cavity wall of the front shell 1 and the outer circumferential wall of the middle shell 2; the rear portion of the middle shell 2 is sleeved on the front portion of the rear shell 3, and a seal is formed between the outer circumferential wall of the rear shell 3 and the inner circumferential cavity wall of the middle shell 2; the conductive plate 4 is fixedly arranged on the rear portion of the rear shell 3, and the conductive plate 4 is sealed to the rear end face of the rear shell 3.

[0046] Specifically, the middle shell 2 can be made of silicone, or a flexible plastic or rubber, such as a thermoplastic elastomer or nitrile rubber. In this embodiment, the middle shell 2 is a flexible tube made of a flexible plastic material, while the front shell 1 and the rear shell 3 are both made of a hard plastic material. The material of the middle shell 2 is primarily 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 degree of flexibility. The material of the front shell 1 and the rear shell 3 is primarily selected from at least one of PC (polycarbonate), ABS (acrylonitrile butadiene styrene), PI (polyimide), PA (polyamide), PMMA (polymethyl methacrylate), POM (polyoxymethylene), and PTFE (polytetrafluoroethylene). As a result, the overall weight of the transducer housing is much lighter than that of a traditional monolithic metal housing, further reducing the overall weight of the handle 100.

[0047] The middle shell 2 can be integrally provided on one of the front shell 1 and the rear shell 3, with a sealant layer provided between the other of the two and the middle shell 2, and the sealant layer achieving 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 by a sealant layer, that is, a sealant layer is provided 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 portion 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. This not only facilitates assembly, but also ensures the reliability of the sealing connection between the front shell 1 and the middle shell 2.

[0048] The middle shell 2 has a first cylinder 21, a second cylinder 22 and a third cylinder 23 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, avoiding relative rotation between each other. In this way, when the transducer housing rotates, the transducer 5 can rotate synchronously therewith.

[0049] Here, a plurality of positioning portions 12 are further provided on 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 periphery of the first cylinder 21. The above-mentioned 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.

[0050] The front portion of the front housing 1 is further provided with a stopper 11 having a through hole for the horn front portion 53 to axially extend therethrough. The stopper 11 is located within the inner cavity of the front housing 1, and the flange 51 is located behind the stopper 11. The stopper 11 and the flange 51 cooperate to limit the axial position of the transducer 5 and the transducer housing. Sealant is also provided between the end surfaces where the stopper 11 and the flange 51 meet, further securing and sealing the flange 51 to the stopper 11 of the front housing 1.

[0051] The front portion of the rear shell 3 is cooperatively inserted into the inner cavity of the third barrel 23. 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, while the rear inner cavity is a circle with a gradually decreasing diameter, and so on.

[0052] The rear housing 3 comprises a mounting tube 31 and an end cap 32. The outer diameter of the end cap 32 is larger than that of the mounting tube 31. The rear portion of the middle housing 2 fits snugly over the outer periphery of the mounting tube 31, and the conductive plate 4 is fixedly connected to the rear end surface of the mounting tube 31. The outer periphery of the mounting tube 31 is also provided with a plurality of axially spaced annular ribs 31a. When the mounting tube 31 is inserted into the inner cavity of the connecting portion 22b, the engagement between these annular ribs 31a and the circumferential wall of the connecting portion 22b not only tightens the connection between the two, but also allows for a sealant layer to be positioned between adjacent annular ribs 31a, further enhancing the sealing performance between the two.

[0053] As shown in the various figures, 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. The plate body 41 can be integrally formed with the rear housing 3, or, as in this embodiment, can be fixedly connected to the rear end of the rear housing 3 and sealed to the rear end face of the rear housing 3. The through-hole 41b is defined in the plate body 41 and extends through the plate body 41 along its thickness. The waterproof breathable membrane 42 is fixed to the front face of the plate body 41 and covers the front side of the through-hole 41b.

[0054] Specifically, the conductive plate 4 also includes a conductive member 43 for electrically connecting to an external power supply element, so that when the transducer assembly 10 is rotated to any angle about its own axis, the conductive member 43 can maintain electrical connection with the above-mentioned power supply element. Here, the conductive member 43 is generally in the form of a thin plate, which 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, which are arranged insulated from each other. The first conductive portion 43a is annular, and the second conductive portion 43b is annular or, as shown in this embodiment, disc-shaped. The first conductive portion 43a is coaxially arranged around the circumferential outside of the second conductive portion 43b.

[0055] In this embodiment, the plate body 41 is provided with two or more through-holes 41b, each of which is covered with a waterproof, breathable membrane 42. The circumferential edges of all waterproof, breathable membranes 42 are sealed to the front end of the plate body 41. Here, the two through-holes 41b are spaced apart and located between the first conductive portion 43a and the second conductive portion 43b.

[0056] In this 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. A plurality of positioning protrusions 33 are correspondingly provided 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 one-to-one with the plurality of positioning protrusions 33, so that the conductive plate 4 and the rear shell 3 are positioned correspondingly. The front side surface of the conductive plate 4 is fixed to the rear end surface of the rear shell 3 by bonding with the sealant, so that the conductive plate 4 is fixed to the rear shell 3 and is sealed between the rear shell 3, so that the rear shell 3 is closed at the rear end.

[0057] 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.

[0058] Exemplarily, the transducer assembly 10 of this embodiment can be assembled in the following manner: the front portion 53 of the horn of the transducer 5 is inserted into the inner cavity of the middle shell 2 from the rear of the middle shell 2, and through the through hole in the front of the front shell 1, so that the middle shell 2 is fitted on the outer periphery of the flange 51, and the flange 51 cooperates with the limit portion 11 forward to achieve axial limitation; the two conductive wires 6 are respectively inserted into the two avoidance grooves 31b of the rear shell 3, and then a sealant is provided on the outer periphery of the rear shell 3, and the front portion of the rear shell 3 is inserted forward 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 applied to 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 fixed to each other.

[0059] 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 portion 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 portion 53 of the horn, making the entire structure simpler and the production and installation process 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. During the vacuum operation, the middle housing 2 will not expand outward under the action of pressure due to the pressure difference between the inside and outside of 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 to the existing transducer assembly with an integral metal housing, reducing the burden on the operator's hands and facilitating the implementation of delicate surgery.

[0060] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the essence of the present invention are intended to be included within the scope of protection 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 housing, a middle housing, a rear housing and a conductive plate, wherein the middle housing is sealedly connected between the front housing and the rear housing, the conductive plate is fixedly arranged at the rear of the rear housing, the front of the middle housing or the front housing is cooperatively sleeved on the outer peripheral portion of the flange, a closed chamber is formed among the conductive plate, the rear housing, the middle housing, the front housing and the flange, the rear portion of the amplitude transformer is accommodated in the closed chamber and is electrically connected to the conductive plate, wherein the front housing and the rear housing are both made of hard materials, the middle housing is made of flexible and deformable materials, and a through hole communicating with the closed chamber is further provided on the transducer housing, and the through hole is covered with a waterproof and breathable membrane; 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.

2. The transducer assembly according to claim 1, 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.

3. The transducer assembly according to claim 1, 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.

4. The transducer assembly according to claim 3, 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.

5. The transducer assembly according to claim 1, 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.

6. The transducer assembly according to claim 1, characterized in that: A limiting portion is further provided at the front portion of the front shell. The limiting portion has a through hole for the front portion of the amplitude transformer to pass through in the axial direction. The flange is located behind the limiting portion.

7. The transducer assembly according to claim 6, 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.

8. 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.

9. 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.

10. The transducer assembly according to claim 9, 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.

11. The transducer assembly according to claim 9, 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.

12. 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 11 arranged in an inner cavity of the handle shell.

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