CN201020112Y - Power head for needleless injector - Google Patents

Abstract

A power head for needle-free injector belongs to the field of power mechanism for needle-free injector, aiming at simplifying the structure, triggering at the top and self-applying by the patient. The utility model consists of a power source, a trigger mechanism and a safety cap. For the power source (1), a striker sheathed with a power spring, is located in a drum of the power head to form into a plunger; an injector interface is arranged at the end of the power head; for the trigger mechanism (2), via the rotary shaft, a lever is arranged on a lever support which is connected with the power head thread; the external thread of the lever support is connected with a socket; a presser in the socket gets out from a round hole at the end of the socket to be connected with the socket slideably; a balance spring is arranged between the presser and the lever; the safety cap (3) is located at the end of the socket, and connected with a hinge or thread of the socket. With this utility model, the user can provide power for the needle-free injector by triggering the top to generate instant high pressure so as to make chemicals penetrating through skin quickly and improve the utilization ratio of chemicals.

Description

A kind of needleless injector unit head

Technical field:

This utility model belongs to the power set of needleless injector.

Background technology

Needleless injection claims jet injection again, the instantaneous pressure that utilizes certain energy storage device (as gases at high pressure or spring) to produce, promote medicament (liquid or lyophilized powder) through a very thin nozzle, form high-pressure spray, make medicinal liquid pass skin diffusion rapidly in tissue.This effusive very high speed, representative value is 150-300m/s, and it is limited to enter the degree of depth of human body, and is very little to the stimulation of teleneuron, and therefore tangible sensation of pricking is generally arranged unlike needle injection is arranged.

The origin of needleless injector can be traced back to 1866, and French scientist Galante has proposed Needleless injection thought the earliest, and has provided designing draft.1933, mechanical engineer Sutermeister and doctor Robert Hingson developed needleless injector the earliest jointly, and have carried out clinical research.Needleless injector once was used for the extensive prophylactic immunization of army during World War II, but syringe at that time must carry out filling and adjusting before each the use, and problems such as production technology such as medicament is aseptic, quantitative package are still unresolved, so product is at that time approved widely and paid attention to.Since the eighties in last century, along with the promotion of science and technology development and clinical needs, the research and development of needleless injector present rapid growth momentum.Because convenience, safe, painless, the characteristics of high efficiency of Needleless injection, this technology is day by day extensive in the application of clinical treatment and family health care.

At present typical needleless injector, its structure can be divided into three parts such as unit head, injection head, ampoule joint according to the difference of function.Wherein, unit head comprises safety, flip flop equipment and three parts of power source, is the core of Needleless injection technology.Many organizations have developed different power head devices.The PCT patent application of publication number WO9407554 discloses the power head device that flip flop equipment is positioned at the middle part, this device the operation on not too smoothly, the patent application of publication number CN1382064 discloses the power head device that a kind of flip flop equipment is positioned at the top, the structure more complicated of this device.

Summary of the invention

This utility model provides a kind of needleless injector unit head, and purpose is simplified structure, top triggering, makes things convenient for the patient personal.

A kind of needleless injector unit head of the present utility model is made up of power source, flip flop equipment and three parts of protecting cap; It is characterized in that: (1) power source partly comprises unit head body, syringe interface, power spring, striker, and the dynamic spring of striker overcoat is positioned at the cylinder of unit head body, constitutes piston, and the unit head body end has syringe interface; (2) flip flop equipment comprises lever support, lever, sleeve, head and balancing spring; Lever is supported on the lever support by rotating shaft, lever support is threaded with the unit head body, lever support external screw thread branch sleeve, head are packed into and are stretched out, are slidingly connected with sleeve in the sleeve and from the sleeve ends circular hole, between head and the lever balancing spring are housed; (3) protecting cap is positioned at described sleeve ends, is connected with the sleeve hinge or is threaded.

Described a kind of needleless injector unit head is characterized in that: described balancing spring is spiral compression spring or circumferentially compresses spring.

This utility model is simple in structure, make things convenient for the patient personal, adopt unit head of the present utility model, user can provide power for its employed needleless injector by the mode that trigger at the top, in needleless injector, produce instantaneous high pressure, make liquid state or powdery medicine transdermal, arrive fast subcutaneous layer of fat, alleviating patient's pain, and can improve drug utilization efficient.

Description of drawings

Fig. 1 is an embodiment sketch map of the present utility model;

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

Fig. 3 is the profile of lever support 7.

The specific embodiment

As shown in Figure 1, this utility model comprises power source, flip flop equipment and three parts of protecting cap; Power source partly comprises unit head body 3, syringe interface 1, power spring 4, striker 2; Flip flop equipment comprises lever support 7, lever 8, rotating shaft 9, sleeve 6, head 11 and balancing spring 10 etc.; Protecting cap 12 is connected with sleeve 6 hinges.Wherein, lever support 7 is fixed in by being threaded on the unit head body 3, and power spring 4 and striker 2 are positioned at the cylinder of body, are drilled with aperture with supporting revolving shaft and lever on lever support 7, head can slide up and down in sleeve, and balancing spring plays balanced lever and head.Before use, striker 2 is positioned at bottom syringe interface 1 place of unit head body 3, and the barb with the flip flop equipment lever does not link to each other, power spring 4 in a state of nature, at this moment, under the effect of balancing spring 10, lever 8 is in level, and head 11 is replied the position of going up most.In use, the protecting cap that closes promotes striker 2 by hold down gag from syringe interface 1 and moves up, and power spring 4 compresses thereupon, and when being compressed to the precalculated position, the head of striker 2 withstands the hook of lever 8, and at this moment, striker 2 moves on continuing under external force.At this moment, lever 8 comes back to the equilbrium position, remove external force after, under the effect of power spring 4, striker 2 is done the motion of little displacement downwards, when the striker barb contacted with the lever barb, lever 8 was about to striker 2 and pins, and makes it can't continue to move downward.During use, the syringe that medicine is housed is installed on syringe interface 1 after, the syringe spout is pushed down the skin of injection site, opens protecting cap, presses head 11.Head 11 moves downward under external force, presses lever 8, and lever 9 is rotated to an angle around the shaft, and at this moment, the lever barb begins outside motion, thus the disengage hammer barb.Then, under the power spring effect, striker 2 produces very big kinetic energy, and the piston rod in the pushing syringe moves downward, and produces very high instantaneous pressure in syringe, and medicine is under the instantaneous high pressure effect, and transdermal injects subcutaneous layer of fat.

Claims (2)

1. a needleless injector unit head is made up of power source, flip flop equipment and three parts of protecting cap; It is characterized in that: (1) power source partly comprises unit head body, syringe interface, power spring, striker, and the dynamic spring of striker overcoat is positioned at the cylinder of unit head body, constitutes piston, and the unit head body end has syringe interface; (2) flip flop equipment comprises lever support, lever, sleeve, head and balancing spring; Lever is supported on the lever support by rotating shaft, lever support is threaded with the unit head body, lever support external screw thread branch sleeve, head are packed into and are stretched out, are slidingly connected with sleeve in the sleeve and from the sleeve ends circular hole, between head and the lever balancing spring are housed; (3) protecting cap is positioned at described sleeve ends, is connected with the sleeve hinge or is threaded.

2. a kind of needleless injector unit head as claimed in claim 1 is characterized in that: described balancing spring is spiral compression spring or circumferentially compresses spring.

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