Ultrasonic treatment head based on solution polymerization type hydrogel coupling
By using chemical crosslinked acrylamide hydrogel in the ultrasonic treatment head to fill the concave feature grooves of the piezoelectric ceramics and form a stable coupling cavity, the problems of coupling agent in the prior art are solved, and ultrasonic energy is achieved The stable focus and efficient output improve the acoustic performance and yield of the treatment head.
Patent Information
- Application Number
- CN202420721556.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-09
AI Technical Summary
During the production process, existing ultrasonic treatment heads have low yield due to instability and sealing problems of coupling agents, and the processing process is prone to bubbles, affecting the acoustic performance.
Using ultrasonic treatment head design based on solution polymerization hydrogel coupling, avoid air by filling chemical crosslinked acrylamide hydrogels in the concave feature grooves of piezoelectric ceramics and using sealing rings and cushions to form a stable coupling cavity. Bubble generation ensures effective output of sound energy.
It realizes stable focus and efficient output of ultrasonic energy, improves the acoustic performance and yield of the treatment head, avoids moisture loss and hydrolysis, and enhances the integrity of the ceramic.
Smart Images
Figure CN222238573U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to an ultrasonic treatment head based on solution polymerization type hydrogel coupling. Background Art
[0002] In conventional ultrasonic therapy head production methods, the coupling cavity is mainly filled with pure water or other physically cross-linked gels (such as medical ultrasonic coupling agents, etc.).
[0003] There are two problems in the process of using these two types of coupling materials to make products: 1. Pure water as a coupling agent will be lost or volatilized under poor sealing conditions, thus affecting product quality. Water as a medium has extremely high requirements for the sealing of the product, and the yield rate is low during the production process. The use of physically cross-linked ultrasonic coupling agents has unstable performance and is prone to hydrolysis (or hydration). 2. Due to the concave shape of piezoelectric ceramics, bubbles are easily generated during the process of processing the probe when using the above two types of coupling agents.
[0004] Alternatively, a hole may be opened on the top of the ceramic, and a coupling agent may be injected into the coupling cavity through the hole and then sealed to avoid bubbles. However, such a process may destroy the integrity of the ceramic and reduce the acoustic performance of the treatment head. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides an ultrasonic treatment head based on solution polymerization hydrogel coupling, wherein the ultrasonic treatment head is designed and constructed with a treatment head shell as the main body, and a silicone rubber lens is provided at one end of the treatment head shell, and a power plug is connected to the other end through a wire;
[0006] A concave piezoelectric ceramic is provided on one side of the silicone rubber lens, and a coupling cavity is formed between the silicone rubber lens and the piezoelectric ceramic via a sealing ring. A pressure block is provided on the end surface of the treatment head shell to further compress the piezoelectric ceramic and the sealing ring.
[0007] A hydrogel solution is arranged in the concave characteristic groove of the piezoelectric ceramic, and then a stable integral hydrogel is formed.
[0008] In one embodiment of the utility model, a negative electrode wire and a positive electrode wire are provided on the outside of the piezoelectric ceramic, that is, the wires connected to the power plug.
[0009] The above technical solution of the utility model has the following advantages over the prior art: in the ultrasonic treatment head described in the utility model, the coupling cavity formed between the concave piezoelectric ceramic and the convex lens (human body) is effectively filled with a coupling medium, so that the acoustic energy can be smoothly output; and according to the reaction characteristics of the hydrogel, a two-step method is used to manufacture the treatment head, which can better avoid the generation of air bubbles in the coupling cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.
[0011] Figure 1 This is a schematic diagram of the appearance structure of the ultrasonic treatment head based on solution polymerization type hydrogel coupling of the utility model;
[0012] Figure 2 It is a schematic diagram of the cross-sectional structure of the ultrasonic treatment head of the utility model;
[0013] Figure 3 It is a schematic diagram of the structure of the piezoelectric ceramics forming a hydrogel plane of the utility model;
[0014] Figure 4 It is a flow chart of the implementation process of the ultrasonic treatment head of the utility model.
[0015] As shown in the figure: 1. Treatment head shell, 2. Silicone rubber lens, 3. Power plug, 21. Press block, 22. Piezoelectric ceramics, 23. Coupling cavity, 24. Negative wire, 25. Positive wire, 26. Sealing ring, 31. Hydrogel. DETAILED DESCRIPTION
[0016] like Figure 1 and Figure 2 As shown, this embodiment provides an ultrasonic treatment head based on solution polymerization hydrogel coupling, wherein the ultrasonic treatment head is designed and constructed with a treatment head shell as the main body, and a silicone rubber lens is provided at one end of the treatment head shell, and a power plug is connected to the other end through a wire;
[0017] A concave piezoelectric ceramic is provided on one side of the silicone rubber lens, and a coupling cavity is formed between the silicone rubber lens and the piezoelectric ceramic via a sealing ring. A pressure block is provided on the end surface of the treatment head shell to further compress the piezoelectric ceramic and the sealing ring.
[0018] like Figure 3 As shown, a hydrogel solution is arranged in the concave characteristic groove of the piezoelectric ceramic, and then a stable integral hydrogel is formed.
[0019] A negative electrode wire and a positive electrode wire are arranged on the outside of the piezoelectric ceramic, that is, the wires connected to the power plug.
[0020] The main principle of the ultrasonic treatment head described in this embodiment is to focus the ultrasonic energy in a certain area through the electro-acoustic conversion of piezoelectric ceramics, thereby generating thermal effects or other physical effects to treat the focused area. The key point for the effective focusing of ultrasonic energy is to effectively fill the coupling medium in the coupling cavity formed between the concave piezoelectric ceramics of the treatment head and the convex lens (human body) so that the acoustic energy can be smoothly output. It has been theoretically proven that the best coupling medium between the two is pure water, but if there are air bubbles in the coupling cavity, the focusing performance of the ultrasound will decay rapidly (the main reason is that the acoustic impedance of air is very different from that of ceramics or water, and ultrasonic energy cannot be transmitted through the air).
[0021] The embodiment mainly involves filling a chemically cross-linked acrylamide hydrogel in the coupling cavity of the treatment head for coupling, and its acoustic performance is basically consistent with that of pure water (the following table: acoustic parameters of pure water and chemically cross-linked hydrogel). And according to the reaction characteristics of the hydrogel, a two-step method is used to make the treatment head, which can better avoid the generation of air bubbles in the coupling cavity.
[0022]
[0023] Furthermore, if Figure 4 As shown, a cross-linked hydrogel prepolymer solution is prepared, and the prepolymer solution mainly comprises acrylamide monomer (5%-10%), a cross-linking agent such as N,N-methylenebisacrylamide (0.03%-0.05%), an initiator such as ammonium persulfate (0.1%-0.3%), an accelerator such as tetramethylethylenediamine (0.5%-1%) and deionized water (85%-95%);
[0024] The prepared hydrogel prepolymer solution is poured into the piezoelectric ceramic with the concave surface facing upward until it is level, and left to react for 2 hours at room temperature. The hydrogel formed in the ceramic is tightly adsorbed inside the ceramic to form a plane.
[0025] Repeat the above steps to prepare the hydrogel solution, and pour the solution into the concave lens mold cavity of the treatment head, install the ceramic with gel in the treatment head, and install the pressing block to press the ceramic and the sealing ring. After the treatment head is placed at room temperature for 24 hours, a stable overall hydrogel will be formed in the coupling cavity, with no air residue inside, and a good ultrasonic coupling effect.
[0026] In this embodiment, chemically cross-linked polyacrylamide hydrogel is used for coupling the treatment head, and its performance is stable, and its acoustic performance is basically consistent with that of pure water (as shown in the table). Chemically cross-linked hydrogel has stable performance, water retention, can effectively prevent water loss and will not hydrolyze;
[0027] The two-step process for manufacturing the treatment head can effectively avoid the formation of air bubbles in the coupling cavity and improve the performance of ultrasound focusing.
[0028] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.
Claims
1. An ultrasonic treatment head based on solution polymerization hydrogel coupling, characterized in that: The ultrasonic treatment head is designed and constructed with a treatment head shell (1) as the main body, and a silicone rubber lens (2) is provided at one end of the treatment head shell (1), and a power plug (3) is connected to the other end via a wire; A concave piezoelectric ceramic (22) is provided on one side of the silicone rubber lens (2), and a coupling cavity (23) is formed between the silicone rubber lens and the piezoelectric ceramic via a sealing ring (26), and a pressing block (21) is provided on the end surface of the treatment head shell so that the piezoelectric ceramic and the sealing ring (26) are further pressed together; A hydrogel solution is arranged in the concave characteristic groove of the piezoelectric ceramic, and then a stable integral hydrogel (31) is formed.
2. The ultrasonic treatment head according to claim 1, characterized in that: A negative electrode wire (24) and a positive electrode wire (25) are arranged on the outside of the piezoelectric ceramic, which are wires connected to a power plug.