CN201366148Y

CN201366148Y - Power head of needleless injector

Info

Publication number: CN201366148Y
Application number: CNU2009200839618U
Authority: CN
Inventors: 史铁林; 杨祥良; 杨曙年; 赵英俊; 熊良才; 彭睿; 车志刚
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2009-03-02
Filing date: 2009-03-02
Publication date: 2009-12-23
Anticipated expiration: 2019-03-02

Abstract

A power head of a needleless injector belongs to a medical appliance and solves the problem of complicated structure in the prior power head. In the utility model, an open hole is formed at the upper end of a power head body, and the lower end thereof is connected with a connector piece of the injector; a push rod and a power spring are mounted in a hollow cavity of the power head body; a trapezoidal annular slot is formed at the upper end of the push rod; the lower end of the push rod and the power head body are in position fit; the upper end of the power head body is positioned in a sleeve cup; the end part of the sleeve cup is in contact with a button; the button is limited by a connecting sleeve; an annular boss is formed on the inner wall of the sleeve cup, and presses a roll ball into the trapezoidal annular slot at the upper end of the push rod from the open hole on the side wall at the upper end of the power head body; and a U-shaped clamp spring is connected with the connecting sleeve through a clamp spring cap, and clamped on two clamp slots on the side surfaces of a cylindrical part of the button. The utility model has the advantages of simple and compact structure, small volume, good manufacturability as well as simple and convenient operation, and can prevent automatic triggering of external interference. Furthermore, a user can provide power for the used needleless injector in a top triggering manner.

Description

A kind of needleless injector power head

Technical field

This utility model belongs to medical device, is specifically related to a kind of needleless injector power head.

Background technology

Needleless injection claims jet injection again, and the instantaneous pressure that utilizes machinery (as gases at high pressure or spring) to produce promotes medicament (liquid or lyophilized powder) through a very thin nozzle, forms high-pressure spray, makes medicinal liquid pass skin diffusion rapidly in tissue.This effusive very high speed, representative value is 120-300m/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 degree of depth that jet penetrates depends on many factors, such as aperture of skin and fat tissue thicknesses and injection pressure and spray-hole etc.

The origin of needleless injector can be traced back to 1566, 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 medicament is aseptic, problems such as production technology such as quantitative package are still unresolved, so product is at that time approved widely and paid attention to.

Since the eighties in last century, promotion along with science and technology development and clinical needs, 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, and the research and development of needleless injector present rapid growth momentum.

Typical needleless injector, its structure can be divided into three parts such as unit head, injection head, ampoule joint.Wherein, unit head comprises Arming Assembly, triggers assembly and three parts of Power Component, it is the core of Needleless injection technology, developed at present different power head devices, patent documentation WO9407554 discloses the power head device that flip flop equipment is positioned at the middle part, too not smoothly, the patent application of publication number CN382064, application number 0082839.2 discloses the power head device that a kind of flip flop equipment is positioned at the top to this device, the structure more complicated of this device in operation.

Summary of the invention

This utility model provides a kind of needleless injector power head, solves the problem of existing power head structure more complicated.

A kind of needleless injector power head of the present utility model comprises unit head body, push rod, power spring, syringe interface spare, it is characterized in that:

The unit head body is the cylindrical element with cavity, and its upper end sidewall has a plurality of perforates, and its lower end is threaded with syringe interface spare; Push rod and cover power spring thereon are installed in the cavity of unit head body; The push rod upper end has trapezoidal annular groove, and the push rod lower end constitutes piston with the cavity of unit head body and cooperates; Syringe interface spare moves downward push rod and plays position-limiting action;

Described unit head body upper end is positioned at a set of cups, and a set of cups end contacts with button, button cover by jump ring and the adapter sleeve that is threaded with the unit head body spacing; Unit head body upper end side-wall hole is built-in with ball, has annular boss on a set of cups inwall, and when being positioned at enable position, annular boss and ball are tangent, and ball is pressed into trapezoidal annular groove on the push rod from the perforate of unit head body upper end sidewall, and push rod is locked; When a set of cups moves downward under the button effect, annular boss loses the position-limiting action to ball, and ball moves to the periphery by the perforate of unit head body upper end sidewall under the effect of push rod pressure, and push rod is released;

The U-shaped jump ring places between jump ring lid and the adapter sleeve, is stuck on lateral two draw-in grooves of button column part, and the motion of locking button down, the jump ring lid is connected by screw with adapter sleeve; During use, rotary knob is extruded draw-in groove with jump ring, and button can move downward, and promotes a set of cups.

Described needleless injector power head is characterized in that:

Described syringe interface spare can pass through the screw thread up-down adjustment in the cavity of unit head body lower end, to adapt to the requirement under the different injecting conditions; Syringe interface spare interior wall construction adapts with the interface structure of the needleless injector injection head that is used.

After the power spring compression was upper, unit head was positioned at enable position, and a set of cups inwall annular boss and ball are tangent, with the perforate of ball from unit head body upper end sidewall, was pressed into the trapezoidal annular groove in push rod upper end, and push rod is locked; When a set of cups moves downward under the button effect, annular boss loses the position-limiting action to ball, ball moves to the periphery by the perforate of unit head body upper end sidewall under the effect of push rod pressure, d/d push rod moves downward under the effect of high strength power spring, the cavity of push rod lower end and unit head body constitutes piston, realize the triggering of unit head, in needleless injector, produce instantaneous high pressure.

The Cross section Design of button becomes certain shape, and after rotating to an angle, button just can pass jump ring and move downward, and before the opening safety assembly, jump ring cooperates with draw-in groove, locking the button down motion; In the time will using, button rotation can be extruded draw-in groove with jump ring, at this moment button just can move downward, and promotes a set of cups, discharges push rod; This utility model prevents that by this structure the Needleless injection unit head is by inadvertent free.

This utility model is simple in structure, compact, and volume is little, and good manufacturability is simple to operation, and syringe interface spare scalable is to adapt to the requirement of different injecting conditions; Can prevent that being subjected to external disturbance triggers automatically.Adopt unit head of the present utility model, the mode that user can trigger by the top produces instantaneous high pressure for its employed needleless injector provides power in needleless injector, make liquid state or powdery medicine transdermal, arrives subcutaneous tissue fast.

Description of drawings

Fig. 1 is a cutaway view of the present utility model;

Fig. 2 is the structural representation of button in this utility model;

Fig. 3 is a U-shaped jump ring sketch map in this utility model.

The specific embodiment

As shown in Figure 1, unit head body 8 is for having the cylindrical element of cavity, and its upper end sidewall has a plurality of perforates, and its lower end and syringe interface spare 11 are by being threaded; Push rod 10 and cover power spring 9 thereon are installed in the cavity of unit head body 8; Push rod 10 upper ends have trapezoidal annular groove, and push rod 10 lower ends constitute piston with the cavity of unit head body 8 and cooperate; Syringe interface spare moves downward push rod and plays position-limiting action; Syringe interface spare 11 interior wall constructions adapt with the interface structure of the needleless injector injection head that is used, as helicitic texture.

Unit head body 8 upper ends are positioned at a set of cups 4, and a set of cups 4 ends contact with button 1, and button 1 is spacing by the adapter sleeve 5 that is threaded with unit head body 8; Unit head body upper end side-wall hole is built-in with ball 7, have annular boss 6 on a set of cups 4 inwalls, when being positioned at enable position, annular boss 6 is tangent with ball 7, ball is pressed into the trapezoidal annular groove in push rod 10 upper ends from the perforate of unit head body 8 upper end sidewalls, with push rod 10 lockings; When a set of cups moves downward under button 1 effect, annular boss 6 loses the position-limiting action to ball 7, and ball moves to the periphery by the perforate of unit head body upper end sidewall under the effect of push rod pressure, and push rod 10 is released;

U-shaped jump ring 3 places between jump ring lid 2 and the adapter sleeve 5, is stuck on lateral two draw-in grooves of button 1 column part, and jump ring covers 2 and is connected by screw with adapter sleeve 5.

As shown in Figure 2, button 1 column part side has two draw-in grooves 12; U-shaped jump ring 3 shown in Figure 3 is stuck on lateral two draw-in grooves 12 of button 1 column part, and locking button 1 moves downward; During use, rotary knob 1 is extruded draw-in groove with jump ring, and button 1 can move downward, and promotes a set of cups 4, discharges push rod, realizes trigger action.

Solid line and dotted line represent push rod before triggering and the position of injection when finishing respectively among Fig. 1.

This utility model is simple to operate and reusable.When this unit head is in not triggering state shown in Fig. 1 solid line, connect the needleless injector of filling medicament by mouthpiece 11, the needleless injector spout is aimed at the injection site, press behind the rotary knob 1, trigger unit head, just finished injection process.When reusing, at first button 1 should be rotated to original position (can locate by the labelling that jump ring covers on 2), utilization and the string holder that this unit head is used promote push rod 10 and move upward, compression spring 9.Push rod 10 promotes a set of cups 4 and button 1 and moves upward with after a set of cups 4 contacts, and final U-shaped jump ring 3 can snap in button 1 lateral draw-in groove 12.Remove string holder this moment, just push rod 10 can move downward under the effect of spring 9, gets back to state before the triggering shown in Fig. 1 solid line.

Claims

1. a needleless injector power head comprises unit head body (8), push rod (10), power spring (9), syringe interface spare (11), it is characterized in that:

Unit head body (8) is for having the cylindrical element of cavity, and its upper end sidewall has a plurality of perforates, and its lower end is threaded with syringe interface spare (11); Push rod (10) and cover power spring (9) thereon are installed in the cavity of unit head body (8); Push rod (10) upper end has trapezoidal annular groove, and push rod (10) lower end constitutes piston with the cavity of unit head body (8) and cooperates; Syringe interface spare moves downward push rod and plays position-limiting action;

Described unit head body (8) upper end is positioned at a set of cups (4), and a set of cups (4) end contacts with button (1), button (1) cover (2) by jump ring and the adapter sleeve (5) that is threaded with unit head body (8) spacing; Unit head body upper end side-wall hole is built-in with ball (7), has annular boss (6) on a set of cups (4) inwall, when being positioned at enable position, annular boss (6) is tangent with ball (7), ball is pressed into the trapezoidal annular groove in push rod (10) upper end from the perforate of unit head body upper end sidewall, push rod (10) is locked; When a set of cups moves downward down in button (1) effect, annular boss (6) loses the position-limiting action to ball (7), and ball moves to the periphery by the perforate of sidewall on the unit head body under the effect of push rod pressure, and push rod (10) is released;

U-shaped jump ring (3) places between jump ring lid (2) and the adapter sleeve (5), is stuck on button (1) lateral two draw-in grooves of column part (12), and locking button (1) moves downward, and jump ring lid (2) is connected by screw with adapter sleeve (5); During use, rotary knob (1) is extruded draw-in groove (12) with jump ring, and button (1) can move downward, and promotes a set of cups (4).

2. needleless injector power head as claimed in claim 1 is characterized in that:

Described syringe interface spare can pass through the screw thread up-down adjustment in the cavity of unit head body lower end, syringe interface spare interior wall construction adapts with the interface structure of the needleless injector injection head that is used.