CN107670183B - Self-focusing ultrasonic transducer - Google Patents
Self-focusing ultrasonic transducer Download PDFInfo
- Publication number
- CN107670183B CN107670183B CN201711089595.2A CN201711089595A CN107670183B CN 107670183 B CN107670183 B CN 107670183B CN 201711089595 A CN201711089595 A CN 201711089595A CN 107670183 B CN107670183 B CN 107670183B
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- ring
- piezoelectric ceramic
- ceramic wafer
- cover
- nylon
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- 239000000919 ceramic Substances 0.000 claims abstract description 80
- 239000004677 Nylon Substances 0.000 claims abstract description 45
- 229920001778 nylon Polymers 0.000 claims abstract description 45
- 230000006835 compression Effects 0.000 claims abstract description 29
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 206010028980 Neoplasm Diseases 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010046798 Uterine leiomyoma Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N7/00—Ultrasound therapy
- A61N7/02—Localised ultrasound hyperthermia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N7/00—Ultrasound therapy
- A61N7/02—Localised ultrasound hyperthermia
- A61N7/022—Localised ultrasound hyperthermia intracavitary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention belongs to the field of medical appliances, and provides a self-focusing ultrasonic transducer. The transducer comprises a shell, a piezoelectric ceramic wafer, a central fixing ring, a nylon ring cover, a compression ring, a fastening ring and an upper cover, wherein the piezoelectric ceramic wafer, the central fixing ring, the nylon ring cover, the compression ring, the fastening ring and the upper cover are all arranged in the shell, the nylon ring cover is arranged on the piezoelectric ceramic wafer, the compression ring is fastened in the shell and abuts against the nylon ring cover, the nylon ring cover compresses the periphery of the outer ring of the piezoelectric ceramic wafer, the central fixing ring sequentially penetrates through the piezoelectric ceramic wafer, the nylon ring cover and the compression ring and is fixedly sleeved with the fastening ring, the periphery of the inner ring of the piezoelectric ceramic wafer is clamped between the central fixing ring and the nylon ring cover, the fastening ring abuts against the nylon ring cover, and the upper cover is sleeved on the central fixing ring and abuts against the fastening ring and is fixedly connected with the compression ring through a connecting piece. The invention greatly optimizes the structure of the prior transducer, reduces the load of the piezoelectric ceramic wafer and improves the stability of sound wave output.
Description
Technical Field
The invention belongs to the technical field of medical appliances, and particularly relates to a self-focusing ultrasonic transducer.
Background
The ultrasonic treatment has the advantages of noninvasive, high efficiency, controllability and the like, and the tumor can be heated to the effective treatment temperature by the ultrasonic focusing technology. In contrast, in the medical equipment for treating tumors by ultrasonic waves, an ultrasonic focusing transducer is a core component, and in the hysteromyoma treatment system, an annular self-focusing transducer is widely applied. The ring-shaped self-focusing transducer is characterized by that the piezoelectric ceramic wafer is directly made into curved surface, and said transducer possesses the advantages of small volume, large sound intensity, concentrated energy and small loss, etc..
As shown in fig. 1, the conventional self-focusing transducer is configured such that a piezoelectric ceramic wafer 10' is placed in a housing 20, an inner pressing ring 30 is screwed into the housing 20 by screwing, and then the piezoelectric ceramic wafer 10' is screwed to a connecting tube 50' after passing through a central hole of the piezoelectric ceramic wafer 10' by a core tube 40', the convex surface of the piezoelectric ceramic wafer 10' is positive, the concave surface is negative, the inner pressing ring 30, the core tube 40' and the connecting tube 50' are all made of conductive materials, a negative lead 60 in a cable is electrically connected to the connecting tube 50', the positive lead 70' is electrically connected to the inner pressing ring 30, and a short wire 80 is electrically connected between the inner pressing ring 30 and the upper surface of the piezoelectric ceramic wafer 10' to provide high-frequency voltage to the piezoelectric ceramic wafer 10', so that the piezoelectric ceramic wafer 10' vibrates and outputs ultrasonic waves with the same frequency. However, in the above-described structure, the weight of the connecting tube 50', the core tube 40', and the waterproof joint 90 are all pressed against the piezoelectric ceramic wafer 10', and the inner pressing ring 30 is in rigid contact with the piezoelectric ceramic wafer 10', not only greatly increasing the load of the piezoelectric ceramic wafer 10', but also easily causing damage to the piezoelectric ceramic wafer 10', and the piezoelectric ceramic wafer 10 'is a material sensitive to mechanical force, which greatly affects the high-frequency vibration of the piezoelectric ceramic wafer 10', thereby causing unstable acoustic wave output. In addition, in the above-described structure, the piezoelectric ceramic wafer 10' is connected by welding a stub 80 to the piezoelectric ceramic wafer 10', and then connecting the stub to the inner pressing ring 30, the inner pressing ring 30 is used as a conductor, the positive electrode lead 70' of the cable is connected to the inner pressing ring 30 through the hole of the waterproof connector 90 before the connecting tube 50' is screwed to the core tube 40', the positive electrode lead 70' of the cable is connected to the inner pressing ring 30 through the hole of the waterproof connector 90, the negative electrode lead 60 is connected to the connecting tube 50', and the connecting tube 50' is screwed to the core tube 40', so that the connection is inconvenient due to limited space.
Disclosure of Invention
The embodiment of the invention aims to solve the technical problem of unstable acoustic wave output of an ultrasonic transducer in the prior art by providing a self-focusing ultrasonic transducer.
The embodiment of the invention is realized by providing a self-focusing ultrasonic transducer, which comprises a shell, a piezoelectric ceramic wafer, a central fixing ring, a nylon ring cover, a compression ring, a fastening ring and an upper cover, wherein the piezoelectric ceramic wafer, the central fixing ring, the nylon ring cover, the compression ring, the fastening ring and the upper cover are all arranged in the shell, the nylon ring cover is arranged on the piezoelectric ceramic wafer, the periphery of the compression ring is fastened on the inner wall of the shell and abuts against the nylon ring cover, the nylon ring cover compresses the periphery of the outer ring of the piezoelectric ceramic wafer, the central fixing ring sequentially penetrates through the piezoelectric ceramic wafer, the nylon ring cover and the compression ring and is mutually sleeved and fixed with the fastening ring, the lower end of the fastening ring abuts against the upper end of the nylon ring cover, the periphery of the piezoelectric ceramic wafer is clamped between the central fixing ring and the nylon ring cover, the upper end of the central fixing ring is sleeved in the middle of the upper cover and abuts against the fastening ring, and the periphery of the upper cover is fixedly connected with the compression ring through a connecting piece.
Further, the compression ring is connected with the shell through threads.
Further, the upper cover is made of plastic.
Further, the shell is internally provided with a first step and a second step, when the compression ring is assembled in the shell, the lower surface of the compression ring is not lower than the upper surface of the first step, the upper cover is provided with a ring part, and the second step is covered by the ring part.
Further, the ring part is fixedly connected with the compression ring through screws.
Further, a third step is arranged in the shell, the piezoelectric ceramic wafer is in a hollow round table shape, the periphery of the outer ring of the piezoelectric ceramic wafer is propped against the third step, and the lower end of the nylon ring cover is tightly pressed against the periphery of the outer ring of the piezoelectric ceramic wafer.
Further, the center fixing ring is connected with the fastening ring through threads.
Further, a contact part is arranged at the lower end of the central fixing ring, and the contact part abuts against the inner concave surface of the piezoelectric ceramic wafer after the fastening ring is tightly screwed on the central fixing ring.
Further, the transducer further comprises a waterproof connector and a cable, the waterproof connector is mounted on the upper cover, the cable penetrates through the waterproof connector and comprises a negative electrode wire and a positive electrode wire, the positive electrode wire penetrates through the nylon ring cover and is electrically connected with the outer convex surface of the piezoelectric ceramic wafer, the negative electrode wire is electrically connected with the fastening ring, and the fastening ring, the central fixing ring and the inner concave surface of the piezoelectric ceramic wafer are electrically conducted.
Further, a plurality of threaded holes distributed along the circumferential direction are formed in the periphery of the fastening ring, screws are electrically connected to the negative electrode lead, and the screws are fastened in the threaded holes. .
Compared with the prior art, the embodiment of the invention has the beneficial effects that: according to the invention, the periphery of the compression ring is fastened on the inner wall of the shell, so that the compression ring is abutted against the nylon ring cover, the periphery of the outer ring of the piezoelectric ceramic wafer is compressed by the nylon ring cover, the central fixing ring sequentially passes through the piezoelectric ceramic wafer, the nylon ring cover and the compression ring and is mutually sleeved and fixed with the fastening ring, so that the periphery of the inner ring of the piezoelectric ceramic wafer is clamped and fixed between the central fixing ring and the nylon ring cover, the piezoelectric ceramic wafer is effectively fixed, meanwhile, the piezoelectric ceramic wafer and the nylon ring cover are in flexible contact, the piezoelectric ceramic wafer is prevented from being damaged, the upper cover, the waterproof joint and other components are mutually isolated from the piezoelectric ceramic wafer, the load of the piezoelectric ceramic wafer is greatly reduced, the vibration influence on the piezoelectric ceramic wafer is reduced, and the stability of acoustic wave output of the transducer is improved.
Drawings
FIG. 1 is a schematic cross-sectional structural view of an ultrasonic transducer provided in the prior art;
FIG. 2 is a schematic diagram of the overall structure of a self-focusing ultrasonic transducer according to an embodiment of the present invention;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a schematic cross-sectional view of FIG. 2;
FIG. 5 is a schematic cross-sectional view of the housing of FIG. 3;
FIG. 6 is a schematic view of the center retainer ring of FIG. 3;
fig. 7 is a schematic view of the upper cover structure in fig. 3.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 2 to 7, the self-focusing ultrasonic transducer according to the embodiment of the present invention includes a housing 1, a piezoelectric ceramic wafer 2, a central fixing ring 3, a nylon ring cover 4, a pressure ring 5, a fastening ring 6, and an upper cover 7. The piezoelectric ceramic wafer 2, the center fixing ring 3, the nylon ring cover 4, the pressing ring 5, the fastening ring 6 and the upper cover 7 are all installed in the shell 1, the nylon ring cover 4 is arranged on the piezoelectric ceramic wafer 2 in a covering mode, the periphery of the pressing ring 5 is fastened on the inner wall of the shell 1 and abuts against the periphery of the nylon ring cover 4, and the nylon ring cover 4 is enabled to press the periphery of the outer ring of the piezoelectric ceramic wafer 2. The center fixing ring 3 sequentially penetrates through the piezoelectric ceramic wafer 2, the nylon ring cover 4 and the compression ring 5 and is mutually sleeved and fixed with the fastening ring 6, specifically, the periphery of the center fixing ring 3 is provided with internal threads, the inner wall of the fastening ring 6 is provided with internal threads, the center fixing ring 3 is connected with the fastening ring 6 through threads, the lower end of the center fixing ring 3 is provided with a contact part 31, after the fastening ring 6 is tightly screwed on the center fixing ring 3, the periphery of the inner ring of the piezoelectric ceramic wafer 2 is clamped between the center fixing ring 3 and the nylon ring cover 4, the contact part 31 is abutted against the inner concave surface of the piezoelectric ceramic wafer 2, the lower end of the fastening ring 6 is abutted against the upper end of the nylon ring cover 4, the middle part of the upper cover 7 is sleeved with the upper end of the center fixing ring 3 and abutted against the fastening ring, the periphery of the upper cover is fixedly connected with the compression ring 5 through a connecting piece, and a space between the shell 1 and the upper cover 7 is filled with a sealant 8 such as epoxy resin.
In the above embodiment, the periphery of the pressing ring 5 has external threads, the inner wall of the housing 1 has internal threads, and the pressing ring 5 is connected with the housing 1 through threads. The shell 1 is internally provided with a first step 11, a second step 12 and a third step 13, and when the compression ring 5 is assembled in the shell 1, the lower surface of the compression ring is not lower than the upper surface of the first step 11, so that the nylon ring cover 4 can press the periphery of the outer ring of the piezoelectric ceramic wafer 2. The upper cover 7 is provided with a ring part 71, the ring part 71 is covered with a second step 12, the ring part 71 of the upper cover 7 is provided with evenly distributed through holes 70 along the circumferential direction, the compression ring 5 is provided with threaded holes 50 corresponding to the through holes 70, and the upper cover 7 and the compression ring 5 are fastened and connected with the threaded holes 50 through screws (not shown in the figure) penetrating through the through holes 70.
The piezoelectric ceramic wafer 2 is in a hollow round table shape, the periphery of the lower end of the piezoelectric ceramic wafer 2 is abutted against the third step 13 of the shell 1, and the periphery of the outer ring of the piezoelectric ceramic wafer 2 is pressed by the lower end of the pressing ring 5. The central fixing ring 3 and the fastening ring 6 are made of conductive materials, so that the central fixing ring 3, the fastening ring 6 and the inner concave surface of the piezoelectric ceramic wafer 2 form a conductive path.
The transducer further comprises a waterproof connector 9 and a cable 10, the waterproof connector 9 is mounted on the upper cover 7, the cable 10 is arranged in the waterproof connector 9 in a penetrating mode, the waterproof connector comprises a negative electrode lead 101 and a positive electrode lead 102, the nylon ring cover 4 is provided with a through hole 40, the positive electrode lead 102 penetrates through the through hole 40 of the nylon ring cover 4 and is electrically connected with the outer convex surface of the piezoelectric ceramic wafer 2 through welding, the negative electrode lead 101 is electrically connected with the fastening ring 6, specifically, a plurality of threaded holes distributed along the circumferential direction are formed in the periphery of the fastening ring 6, the negative electrode lead is welded on an O-shaped terminal (not shown in the figure), the O-shaped terminal is sleeved on a screw 14, the screw 14 is fastened in the threaded holes, poor contact of the negative electrode lead 101 due to vibration of the piezoelectric ceramic wafer 2 is prevented, and the positive electrode lead 102 of the cable 10 is electrically connected with the outer convex surface of the piezoelectric ceramic wafer 2 and the negative electrode lead 101 of the cable 10 is electrically connected with the inner concave surface of the piezoelectric ceramic wafer 2.
The above-mentioned self-focusing ultrasonic transducer assembly process is approximately as follows: the method comprises the steps of firstly placing a piezoelectric ceramic wafer 2 in a shell 1, enabling the peripheral edge of the outer ring to abut against a third step 13 of the shell 1, electrically connecting a positive electrode lead 102 of a cable 10 on the outer surface of the piezoelectric ceramic wafer 2, covering a nylon ring cover 4 above the piezoelectric ceramic wafer 2, enabling the positive electrode lead 102 of the cable 10 to pass through the nylon ring cover 4, connecting a compression ring 5 into the shell 1 through threads, enabling the nylon ring cover 4 to press the peripheral edge of the outer ring of the piezoelectric ceramic wafer 2, then enabling a central fixing ring 3 to pass through the piezoelectric ceramic wafer 2, the nylon ring cover 4 and the compression ring 5 in sequence, then enabling the peripheral edge of the inner ring of the piezoelectric ceramic wafer 2 to be fastened between the nylon ring cover 4 and the central fixing ring 3 through a fastening ring 6 through threads, installing a waterproof joint 9 on an upper cover 7, enabling the cable 10 to pass through the waterproof joint 9, enabling the middle of the upper cover 7 to be sleeved in the central fixing ring 3 through a screw 14 connected with a negative electrode lead of the cable 10, enabling the bottom end of the upper cover 7 to abut against the fastening ring 6, enabling the central fixing ring 3 to pass through the central fixing ring 4 and then enabling the inner ring 7 to be connected with the central fixing ring 7 and the sealing ring 7 to be filled with a gap between the sealing part and the sealing ring 1 and the sealing cover 7.
In summary, the self-focusing ultrasonic transducer of the invention has the following advantages: 1) The nylon ring cover 4 is in flexible contact with the piezoelectric ceramic wafer 2, the piezoelectric ceramic wafer 2 is protected from being damaged, the upper cover 7, the waterproof connector 9 and other components are isolated from the piezoelectric ceramic wafer 2, the load of the piezoelectric ceramic wafer 2 is greatly reduced, the vibration influence on the piezoelectric ceramic wafer 2 can be reduced, and the stability of sound wave output of the transducer is improved. 2) The nylon ring cover 4 is provided with the through holes 40, so that the positive electrode lead 102 of the cable 10 penetrating through the waterproof joint 9 can conveniently penetrate through the through holes 40 to be welded and electrically connected to the upper surface of the piezoelectric ceramic wafer 2, and the negative electrode lead 101 is electrically connected to the fastening ring 6 through the screws 14, and then the upper cover 7 is fastened and connected with the compression ring 5 through the screws, so that wiring and installation are convenient in a limited space.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The self-focusing ultrasonic transducer is characterized by comprising a shell, a piezoelectric ceramic wafer, a central fixing ring, a nylon ring cover, a compression ring, a fastening ring and an upper cover, wherein the piezoelectric ceramic wafer, the central fixing ring, the nylon ring cover, the compression ring, the fastening ring and the upper cover are all arranged in the shell; the compression ring is connected with the shell through threads; the upper cover is made of plastic.
2. The self-focusing ultrasonic transducer according to claim 1, wherein the housing has a first step and a second step therein, the pressing ring is fitted into the housing with a lower surface not lower than an upper surface of the first step, and the upper cover has a ring portion covering the second step.
3. The self-focusing ultrasonic transducer of claim 2, wherein the ring portion is fastened to the pressure ring by a screw.
4. The self-focusing ultrasonic transducer according to claim 1, wherein a third step is arranged in the shell, the piezoelectric ceramic wafer is in a hollow truncated cone shape, the peripheral edge of the outer ring of the piezoelectric ceramic wafer is abutted against the third step, and the lower end of the nylon ring cover presses the peripheral edge of the outer ring of the piezoelectric ceramic wafer.
5. The self-focusing ultrasonic transducer of claim 1, wherein the center fixing ring and the fastening ring are connected by threads.
6. The self-focusing ultrasonic transducer according to claim 5, wherein the lower end of the center fixing ring is provided with a contact portion which abuts against the concave surface of the piezoelectric ceramic wafer after the fastening ring is screwed on the center fixing ring.
7. The self-focusing ultrasonic transducer of any one of claims 1 to 6, further comprising a waterproof connector mounted on the upper cover and a cable penetrating the waterproof connector and including a negative electrode wire and a positive electrode wire, the positive electrode wire penetrating the nylon ring cover and electrically connected to the outer surface of the piezoelectric ceramic wafer, the negative electrode wire electrically connected to the fastening ring, the central fixing ring and the inner concave surface of the piezoelectric ceramic wafer.
8. The self-focusing ultrasonic transducer according to claim 7, wherein a plurality of threaded holes distributed along the circumferential direction are formed in the periphery of the fastening ring, and screws are electrically connected to the negative electrode lead and fastened in the threaded holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711089595.2A CN107670183B (en) | 2017-11-08 | 2017-11-08 | Self-focusing ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711089595.2A CN107670183B (en) | 2017-11-08 | 2017-11-08 | Self-focusing ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107670183A CN107670183A (en) | 2018-02-09 |
| CN107670183B true CN107670183B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711089595.2A Active CN107670183B (en) | 2017-11-08 | 2017-11-08 | Self-focusing ultrasonic transducer |
Country Status (1)
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| CN (1) | CN107670183B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115192928B (en) * | 2022-09-16 | 2023-01-13 | 深圳市普罗医学股份有限公司 | Therapeutic equipment |
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| CN107670183A (en) | 2018-02-09 |
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