Syringe-microinjection-type infusion device based on shape memory alloy driven and method thereof

[0020] The working process of the syringe micro-injection infusion device driven by the shape memory alloy spring will be described in detail below with reference to the accompanying drawings.

[0021] Such as Figure 1~4 As shown, a syringe microinjection infusion device driven by a shape memory alloy includes a support plate 1, a shape memory alloy spring 2, a push rod 3, a return spring 4, a disposable syringe 5, a first clamp 6, a second clamp 7, and Base 8; Base 8 includes baffle 8.1, first fixing plate 8.2, second fixing plate 8.3, bottom plate 8.4; bottom plate 8.4 is equipped with baffle 8.1, first fixing plate 8.2 and second fixing plate 8.3, support plate 1 and the baffle 8.1 are provided with positioning holes, the first fixed plate 8.2 and the second fixed plate 8.3 are provided with semi-circular fixed grooves, the push rod 3 is provided with a block 3.1 in the middle, and the two sides of the block 3.1 have shapes The memory alloy spring 2 and the return spring 4, the end of the push rod 3 where the return spring 4 is installed passes through the positioning hole of the baffle 8.1, and is in contact with the disposable syringe 5. The disposable syringe 5 is placed on the first fixing plate 8.2 and the second fixing In the semi-circular fixing groove on the plate 8.3, and fixed on the first fixing plate 8.2 and the second fixing plate 8.3 by the first clamp 6 and the second clamp 7, the end of the push rod 3 where the shape memory alloy spring 2 is installed penetrates Through the positioning holes of the support plate 1, the support plate 1 is fixed on the bottom plate 8.4 by bolts.

[0022] The shape memory alloy spring is made of nickel-titanium alloy material with a phase transition temperature of 55 to 75 degrees Celsius or 70 to 90 degrees Celsius, a spiral structure, an outer diameter of 7 mm to 15 mm, and a maximum stroke of 1 cm to 6 Between centimeters.

[0023] The said return spring adopts spring steel material and has a spiral structure, the outer diameter is between 7 mm and 15 mm, and the spring coefficient is between 0.2 N/mm and 3 N/mm.

[0024] The micro-injection method of the syringe driven by shape memory alloy is: the temperature of the shape memory alloy spring 2 rises under the action of a 1V to 5V electrical signal. When the temperature reaches above the phase transition temperature, the shape memory alloy spring 2 is controlled by the horse The state of stenosis transforms to the state of austenite, the hardness increases, and the length increases at the same time, which drives the push rod 3 to move in the direction of the disposable syringe 5 and squeeze the return spring 4 to start the injection process. After the injection process is over, the electrical signal stops In effect, the shape memory alloy spring 2 cools naturally, returning from the austenite state to the martensite state, and the hardness decreases, and the shape memory alloy spring 2 is restored to the initial position by the return spring 4 through the push rod 3. Depending on the capacity of the disposable syringe 5, the stroke of the shape memory alloy spring 2 is between 4 cm and 12 cm. By controlling the speed at which the shape memory alloy spring 2 bounces, the injection speed can be adjusted from 0.1 ml/h to 1500 ml/h between.

[0025] Such as Figure 5 Shown is a schematic diagram when the shape memory alloy spring 2 reaches the maximum stroke and the medicine in the disposable syringe 5 is completely extruded. At this time, the compression amount of the return spring 4 reaches the maximum value, and the electrical control signal output drops to zero at the same time.