CN201020112Y - Power head for a needle-free syringe - Google Patents

Abstract

The utility model relates to a power head for a needle-free injector, which belongs to a power device of a needle-free injector, and aims at simplifying the structure, triggering at the top, and being convenient for patients to use by themselves. The utility model is composed of a power source, a trigger device and a safety cover: (1) the power source part, the striker is covered with a power spring, which is located in the cylinder of the power head body to form a piston, and the end of the power head body is provided with a syringe interface; ( 2) In the part of the trigger device, the lever is supported on the lever support through the rotating shaft. The lever support is threadedly connected with the power head body, and the external thread of the lever support is connected to the sleeve. Stretch out, and slide to connect with the sleeve, balance spring is housed between the press head and the lever; (3) The safety cover is located at the end of the sleeve, and is hinged or threaded with the sleeve. By adopting the utility model, the user can provide power for the needle-free injector through the top trigger mode to generate instantaneous high pressure, so that the medicine can quickly penetrate the skin, and the utilization efficiency of the medicine can be improved.

Description

Power head for a needle-free syringe

Technical field:

The utility model belongs to a power device of a needleless injector.

Background technique

Needle-free injection, also known as jet injection, uses the instantaneous high pressure generated by a certain energy storage device (such as high-pressure gas or spring) to push the medicine (liquid or freeze-dried powder) through a very thin nozzle to form a high-pressure jet, so that the medicine liquid can diffuse through the skin into tissues. The speed of this jet is extremely high, with a typical value of 150-300m/s, and the depth of entering the body is limited, and the stimulation to the nerve endings is very small, so it generally does not have the obvious tingling sensation like a needle syringe.

The origin of needle-free syringes can be traced back to 1866, when French scientist Galante proposed the earliest idea of needle-free injection and gave a design sketch. In 1933, mechanical engineer Sutermeister and doctor Robert Hingson jointly developed the earliest needle-free syringe and conducted clinical research. Needle-free syringes were used for large-scale vaccination of the army during World War II, but the syringes at that time had to be filled and adjusted before each use, and problems such as sterility of pharmaceuticals, quantitative packaging and other production processes had not yet been resolved. Therefore, the products at that time were not widely recognized and valued. Since the 1980s, with the development of science and technology and the promotion of clinical needs, the research and development of needle-free syringes has shown a trend of vigorous development. Due to the convenience, safety, painlessness and high efficiency of needle-free injection, this technology is widely used in clinical medicine and family health care.

At present, the structure of a typical needle-free syringe can be divided into three parts according to different functions: a power head, an injection head, and an ampoule connector. Among them, the power head includes three parts: safety device, trigger device and power source, which is the core of needle-free injection technology. Many organizations have developed different powerhead assemblies. The PCT patent application with the publication number WO9407554 discloses a power head device with a trigger device located in the middle, which is not easy to operate. The patent application with the publication number CN1382064 discloses a power head device with a trigger device located at the top. structure is more complex.

Contents of the invention

The utility model provides a power head for a needle-free injector, which aims at simplifying the structure, triggering on the top, and being convenient for patients to use by themselves.

A power head for a needle-free injector of the utility model is composed of three parts: a power source, a trigger device and a safety cover; it is characterized in that: (1) the power source part includes a power head body, a syringe interface, a power spring, and a striker, There is a power spring on the striker jacket, which is located in the cylinder of the power head body to form a piston, and the end of the power head body is provided with a syringe interface; (2) The trigger device includes a lever support, a lever, a sleeve, a press head and a balance spring; the lever Supported on the lever support through the rotating shaft, the lever support is threaded with the power head body, and the lever support is connected to the sleeve with external threads, and the head is loaded into the sleeve and protrudes from the round hole at the end of the sleeve to slide with the sleeve To connect, a balance spring is installed between the press head and the lever; (3) the insurance cover is located at the end of the sleeve and is hinged or threaded with the sleeve.

The power head for a needle-free injector is characterized in that: the balance spring is a helical compression spring or a circumferential compression spring.

The utility model has a simple structure and is convenient for patients to use by themselves. With the power head of the utility model, the user can provide power for the needle-free syringe used by the top trigger, and generate instantaneous high pressure in the needle-free syringe to make the liquid or powder The drug penetrates the skin and reaches the subcutaneous fat layer quickly, so as to relieve the patient's pain and improve the utilization efficiency of the drug.

Description of drawings

Fig. 1 is the embodiment schematic diagram of the present utility model;

Fig. 2 is the three-dimensional schematic diagram of lever support 7;

FIG. 3 is a cross-sectional view of the lever support 7 .

Detailed ways

As shown in Figure 1, the utility model includes three parts: a power source, a trigger device and a safety cover; the power source part includes a power head body 3, a syringe interface 1, a power spring 4, and a striker 2; the trigger device includes a lever support 7, Lever 8, rotating shaft 9, sleeve 6, press head 11 and balance spring 10 etc.; Safety cover 12 is hingedly connected with sleeve 6. Wherein, the lever support 7 is fixed on the power head body 3 by threaded connection, the power spring 4 and the striker 2 are located in the cylinder of the body, and the lever support 7 is drilled with a small hole to support the rotating shaft and the lever. The sleeve slides up and down, and the balance spring plays the role of a balance lever and a press head. Before use, the striker 2 is located at the syringe port 1 at the bottom of the power head body 3 and is not connected to the barb of the trigger lever. The power spring 4 is in its original state. At this time, under the action of the balance spring 10, the lever 8 is in a horizontal position. , press head 11 to return to the top position. When in use, close the safety cover, push the striker 2 from the syringe interface 1 to move upward through the pressing device, and the power spring 4 will be compressed accordingly. When compressed to the predetermined position, the head of the striker 2 will withstand the hook of the lever 8. , the firing pin 2 continues to move up under the action of external force. At this time, the lever 8 returns to the equilibrium position again. After removing the external force, under the action of the power spring 4, the striker 2 moves downward for a small displacement. When the barb of the striker contacts the barb of the lever, the lever 8 is about to lock the striker 2. Hold so that it cannot continue to move downward. When in use, after the syringe containing the medicine is installed on the syringe interface 1, the nozzle of the syringe presses the skin of the injection site, the safety cover is opened, and the button 11 is pressed. The press head 11 moves downward under the action of external force, presses the lever 8, and makes the lever rotate a certain angle around the rotating shaft 9. At this time, the barb of the lever starts to move outwards, thereby throwing off the barb of the striker. Then, under the action of the power spring, the firing pin 2 generates great kinetic energy, pushing the piston rod in the syringe to move downward, and generates a high instantaneous pressure in the syringe. Under the action of the instantaneous high pressure, the drug penetrates the skin and is injected subcutaneously layer of fat.

Claims (2)

1. A power head for a needle-free syringe, which consists of three parts: a power source, a trigger device, and a safety cover; it is characterized in that: (1) the power source part includes a power head body, a syringe interface, a power spring, a firing pin, and a firing pin jacket There is a power spring, which is located in the cylinder of the power head body to form a piston, and the end of the power head body is provided with a syringe interface; (2) The trigger device includes a lever support, a lever, a sleeve, a press head and a balance spring; the lever passes through the shaft Supported on the lever support, the lever support is threadedly connected with the main body of the power head, the external thread of the lever support is connected with the sleeve, the head is loaded into the sleeve and protrudes from the round hole at the end of the sleeve, and is slidably connected with the sleeve. A balance spring is installed between the press head and the lever; (3) the insurance cover is located at the end of the sleeve and is hinged or threaded with the sleeve. 2. A power head for a needle-free injector according to claim 1, wherein the balance spring is a helical compression spring or a circumferential compression spring.

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