CN2595384Y

CN2595384Y - Small dosage self destroying (self-locking) type syringe

Info

Publication number: CN2595384Y
Application number: CN 02232678
Authority: CN
Inventors: 王希平; 杨静
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-05-15
Filing date: 2002-05-15
Publication date: 2003-12-31
Anticipated expiration: 2012-05-15

Abstract

The utility model relates to a self-destroying (self-locking) type syringe with a small dosage, which is composed of a needle head, a needle cylinder, a piston, a core bar, etc., wherein, the rear part of the needle cylinder is a diameter enlarging part, an inner hole of the needle cylinder is provided with a resistance ring and a locking sleeve, and a cross ribbed slab of the core bar is divided into two sections of different sizes. The core bar is namely locked in the needle cylinder when the utility model is used. If a user wants to reuse the utility model, the core bar is back pulled and broken on a connecting column of the core bar to generate self-destroying, and the requirement of one-time operation of the utility model is ensured. The utility model has the advantages of reliable self-locking and self-destroying functions, compact structure, low cost and convenient use.

Description

Low dose of self-destruction (self-locking) formula syringe

Technical field

This utility model relates to a kind of low dose of self-destruction (self-locking) formula syringe, belongs to medicine and hygiene fields.

Background technology

Low dose of syringe owing to be used for specific area such as vaccine injection more, thereby injected dose requires accurately, its scale length even surpass the 10mL specification, this causes the syringe internal diameter very little, thereby give be provided with self-locking (self-destruction) device bring in the design, in the mould manufacturing, the many difficulties in the production, particularly self-locking mechanism is arranged on the forward self-destruction syringe scheme of syringe, as patent 97193570.The self-destruction syringe that X showed: its locking device is arranged on the core bar front end near the piston place, and for the very little low dose of syringe of syringe internal diameter, this arrangement has limited the optimization of locking device structure.Thereby bring harmful effect to mould manufacturing, self-locking property and the rate of manufacturing a finished product, cause cost high.

The utility model content

The purpose of this utility model is to propose a kind of new design for this reason, and its basic main points are that lockable mechanism is arranged on the syringe rear portion, have broken away from effective injection zone, makes the optimized design of lockable mechanism not be subjected to the restriction of the low dose of limited internal diameter of syringe.Thereby preferably resolve the difficult point that present many self-destructions (self-locking) formula syringe patent is used on low dose of syringe.

The purpose of this patent is achieved like this:

A kind of low dose of self-destruction (self-locking) formula syringe, by needle tubing or syringe needle, syringe, lock sleeve, parts such as piston and core bar are formed: the front portion of core bar is union joint and preceding push pedal, the cross push rod that the middle part is made up of level and vertical gusset, hands is pressed at the rear portion, it is identical with common low dose of syringe that the syringe front portion is printed on the graduated part of injected dose, it is characterized in that:, there is a diameter augmenting portion at the syringe rear portion, its diameter of bore approximates the lock sleeve external diameter, one cross section resistance ring triangular in shape is arranged in endoporus, its internal diameter is less than diameter of bore, its front bevel and axis angle are bigger, and back bevel and axis angle are less; The lock sleeve shape is just like hollow collet, the front portion is the inclined-plane that inwardly shrinks and has three above elongated slots, its front end face is perpendicular to axis, the front end diameter of bore is slightly less than the core bar overall dimensions, and its cylindrical middle part has a circumferential clasp, the external diameter of snap ring slightly to equal syringe rear portion diameter of bore, the rear end face of snap ring is perpendicular to axis, lock sleeve rear end diameter of bore is greater than the core bar overall dimensions, and the rear appearance size is greater than hole dimension in the syringe rear portion, and the lock sleeve snap ring is positioned at before the syringe resistance ring; The crossed stiffened plate of core bar has two sections of certain size difference before and after making: preceding crossed stiffened plate overall dimensions is greater than lock sleeve front end diameter of bore, and less than lock sleeve rear end bore, crossed stiffened plate overall dimensions before its preceding push pedal and the union joint size that is connected with rubber piston all are not more than; Back crossed stiffened plate overall dimensions is slightly less than preceding crossed stiffened plate overall dimensions.

The cross section of syringe resistance ring also can be trapezoidal.

Between the forward and backward crossed stiffened plate of core bar, connect by two centrosymmetric little joint pins of breaking.

The clamp that connects once thin film is set on the fin of the rear end of syringe, and the gusset appropriate location is provided with a triangle stopper slot behind core bar, its hypotenuse pro-, straight flange after.During assembling clamp rotated and enter in the stopper slot, then constitute the inherently safe device.

Earlier that lock sleeve is front loaded by core bar during assembling, and remain in the preceding segment limit of crossed stiffened plate, refill rubber piston, core bar is pushed in the syringe together with piston and lock sleeve.Because the lock sleeve front end has certain elasticity, thereby can make snap ring enter into resistance ring inboard, syringe rear portion smoothly.Because lock sleeve snap ring external diameter equals or is slightly larger than syringe rear portion diameter of bore, in case pack in the syringe, promptly closely contact with the syringe rear inside wall, and the resistance ring internal diameter on the syringe less than syringe rear portion internal diameter promptly less than lock sleeve snap ring external diameter, its front end face and syringe axis angle are bigger again, so lock sleeve promptly can't withdraw from again.Because lock sleeve rear end size is greater than the syringe endoporus, in case the snap ring on the lock sleeve is crossed the resistance ring on the syringe, the big end in lock sleeve rear portion is close to the syringe rear wall, and then lock sleeve can not continue to push again.Be that lock sleeve is packed into behind the syringe, lock sleeve will be positioned at the back end of syringe position, and can not move forward and backward again.

Untapped the syringe in assembling back contacts with the straight flange of stopper slot in the core bar stopper slot because the clamp on the syringe has rotated to enter down around thin film, and then core bar can not be pushed away forward by the clamp restriction, has prevented to lose efficacy because of maloperation generation self-locking causes syringe.

During use, first drawing liquid---pull back core bar, because the effect of core bar stopper slot front bevel pushes away stopper slot with clamp, thereby automatically terminate the constraint to core bar, when pushing away the core bar injection more forward, clamp no longer provides constraints.Core bar crossed stiffened plate outer surface slides in lock sleeve front end endoporus during injection, thereby (pressure is little between the outer surface of elasticity lock sleeve front end and crossed stiffened plate almost not have the variation of the power of injecting, thereby frictional resistance is also very little), before injecting end, core bar crossed stiffened plate leading portion skids off the lock sleeve front aperture, because crossed stiffened plate rear end size is little than leading portion, thereby the front end endoporus of lock sleeve contacts with four-bladed vane surface, back because of elastic shrinkage, this moment lock sleeve front end in hole dimension less than preceding crossed stiffened plate size, thereby core bar is locked in the syringe.As desire to reuse and the core bar of pulling back.Then the rear end face of the preceding gusset of core bar will prop up the front end face of lock sleeve and can not move.Further force to pull back, will disconnect at the little joint pin place between forward and backward two gussets and self-destruction has realized disposable instructions for use.

As can be seen, because this patent syringe adopts the scheme that increases syringe rear portion diameter, solved the contradiction between self-locking structure large scale and the low dose of fine needle tube preferably, and part is simple in structure in addition, the mould difficulty is little, and is easy to manufacture, thereby makes the production cost change very little.Second: the dual link post design that the weak point branch of this syringe adopts, guaranteeing to have significantly improved torsional strength under the identical stretch breaking strength condition, thereby can reduce the proportion of goods damageds in production, the use significantly, help to have reduced production cost and application risk.The 3rd: this syringe does not in use almost have the variation of the power of injecting, and is consistent with ordinary syringe.Thereby easilier accepted by the patient.

Description of drawings

Fig. 1: be this low dose of self-destruction (self-locking) formula syringe construction sketch map

The first half represents to assemble unused state among the figure

Lower Half represents to inject the state of end

Fig. 2: the side view (partly cuing open) that is lock sleeve

Fig. 3: the front view that is lock sleeve

Fig. 4: be syringe resistance ring schematic cross-section

Fig. 5: be the core bar structure sketch map

Fig. 6: be after this syringe uses, pull back core bar and the sketch map of self-destruction

Number in the figure explanation: 1. syringe: 11 syringe leading portions, 12 syringe back segments, 121 back segment inwalls

122 resistance rings, 1221 front bevels, 1222 back bevels

13 fins, 14 clamps 15 connect thin film 2. pistons 3. core bars: gusset 321 preceding gusset outer surfaces before push pedal 32 crosses before 31

33 median septums, 331 median septum rear end faces, 332 median septum peripheries

34 little joint pin 35 stopper slots 351 front bevels

Tendon exhaustion 361 back gusset outer surfaces behind 352 rear end faces, 36 crosses

37 press hands 38 connecting rods 39 union joints 4. lock sleeves: endoporus 44 snap rings before flexure strip 42 front end faces 43 before 41

441 snap ring rear end faces, 442 snap ring front bevels, 443 snap ring peripheries

45 rear ramped surface, 46 rear portions, 47 grooves, 48 back endoporus 5. needle tubings 6. syringe needles

The specific embodiment

Below in conjunction with legend this low dose of self-destruction (self-locking) formula syringe is described further:

As can be seen from Figure 1: this injector syringe 1 is compared with ordinary syringe, only rear end 12 diameters of syringe 1 increase to some extent, and change resistance ring 122 into shape shown in Figure 4, even the angle between front bevel 1221 and axis is big as far as possible, (can satisfy condition down on the technology), to increase barrier effect to lock sleeve 4, second: increase clamp 14 and connect thin film 15, and the stopper slot on core bar 3 35 forms the inherently safe locking mechanism, and mistake promoting core bar 3 forward and causing self-locking before preventing to use.

Core bar 3 is formed by the union joint 39 that is connected with rubber piston, connecting rod 38, preceding push pedal 31, crossed

stiffened plate

32,36 and by hands 37.Its main feature is that crossed stiffened plate is divided into forward and backward two parts: preceding gusset 32 and back gusset 36.The profile full-size of preceding gusset 32 is slightly larger than back gusset 36 profile full-sizes; Back gusset 36 profile full-sizes slightly equal elastic front end 41 endoporus 43 diameters under the free state of lock sleeve 4.Between forward and backward two sections gussets 32,36, a circular dividing plate 33 can be set, its external diameter 332 is measure-alike with preceding gusset 32 outer surfaces 321.At dividing

plate

33 and 36 of the gussets in back a pair of little joint pin of breaking 34 at a distance of certain size (symmetric arrangement) is set.On the gusset of this external back gusset 36 a leg-of-mutton stopper slot 35 is set, its front bevel 351 and axis angle less (as 30 °), rear end face is vertical with core bar.

The front portion of syringe 1 can be directly installed on syringe 1 front end with the puncture needle tubing among Fig. 1, to reduce residual quantity, adapts to the vaccine injection requirement; Also can be as Fig. 1 shown in the bottom, replaceable needle head structure is to satisfy other injection instructions for uses.

Fig. 2, lock sleeve 4 shown in Figure 3 are that this syringe realizes that core bar 3 uses once the back to realize the vital part of self-locking, and its shape is just like hollow collet.Its front portion has the elongated slot 47 that is no less than three, thereby flexure strip 41 has certain radial elastic before making.Front end face 42 and the axis normal or the near normal of lock sleeve 4, front end endoporus 43 diameters are slightly less than or equal the maximum overall dimensions of back gusset 36; Thereafter endoporus 48 is greater than the maximum overall dimensions of the preceding gusset 32 of core bar 3.The cylindrical postmedian of lock sleeve 4 has a snap ring 44, and its front bevel 442 has than high inclination-angle with axis, and constitutes the outer poppet surface of preceding flexure strip 41, thereafter end face 441 and axis normal near normal.Rear portion 46 excircle dimensions of lock sleeve are greater than the internal diameter at syringe rear portion 12, thereby lock sleeve can not be pushed in the syringe fully.

From said structure as can be seen: when with lock sleeve 4 when syringe 1 rear end is pressed into syringe rear portion 12, because the anterior flexure strip 41 of lock sleeve 4 has the certain deformation ability, event makes the snap ring 44 on it can pass through the resistance ring 122 at syringe rear portion 12 smoothly, in case the snap ring 44 on the lock sleeve 4 is crossed resistance ring 122, preceding flexure strip 41 elasticity of lock sleeve are opened, and the cylindrical 443 of its snap ring 44 is contacted with the inwall 121 at syringe rear portion 12.Since the rear end face 441 of snap ring 44 and axis normal thus make snap ring 44 be subjected to syringe rear portion 12 resistance ring 122 stopping of front end face 1221 and can not withdraw from syringe; In addition since the maximum excircle dimension of the rear ramped surface 45 of lock sleeve 4 greater than the internal diameter at syringe rear portion 12, thereby the snap ring on the lock sleeve 4 44 is pushed and after crossing resistance ring 122, lock sleeve 4 promptly is limited in the rear end at syringe rear portion 12 and can not moves forward and backward.(asking for an interview Fig. 1)

Anterior flexure strip 41 owing to lock sleeve 4 during assembling has radial elastic, thereby can make things convenient for elder generation that the front end of lock sleeve 4 usefulness from core bar 3 is nested on the preceding gusset 32, rubber piston 2 is enclosed within on the front end union joint 39 and connecting rod 38 of core bar 3 again.With core bar 3 piston 2 is pushed in the syringe 1, is pushed in the syringe rear portion 12 with the lock sleeve 4 that both will be enclosed within on the core bar 3.Because aforementioned features, in case lock sleeve 4 enters in the syringe rear portion 12, then lock sleeve 4 can not be drawn out again.Clamp 14 on the syringe 1 rear end fin 13 removed turn to down, enter into the stopper slot 35 on the core bar 3, and contact, thereby finished the setting of inherently safe mechanism with end face 352 thereafter.At this moment, the front end face 42 of lock sleeve 4 is at the left end of median septum 331.(seeing Fig. 1 the first half), and core bar 3 is subjected to stopping of clamp 14 at this moment and can not promotes forward, maloperation causes self-locking before preventing to use.

The core bar 3 of pulling back during use extracts medicinal liquid, clamp 14 be subjected to stopper slot 35 front bevel 351 on push away effect and leave stopper slot 35, because the elasticity of diaphragm 15 makes 14 can not fall into stopper slot 35 more automatically, thereby has automatically terminated the effect of inherently safe locking system.When promoting core bar 3 once more forward and injecting, clamp 14 no longer stops moving forward of core bar 3.In whole injection process, the endoporus 43 of lock sleeve 4 gently is pressed on the outer surface 321 of preceding gusset 32 of core bar 3 all the time, thereby in whole injection process, the power of almost not injecting changes, and near the injection terminal point time, dividing plate 33 has passed through the front end endoporus 43 of lock sleeve 4, and endoporus 43 contacts with the outer surface 361 of the back gusset 36 of reduced size with contracting because of elasticity.Because the overall dimensions of forward and backward

gusset

32,36 is more or less the same, promptly the springback capacity of the preceding flexure strip 41 of lock sleeve 4 is also little, thereby can not cause the significant change of the power of injecting.Thereby improved the comfortableness of injection.

, the front aperture 43 of lock banking stop 4 moves on to back gusset 36 parts in case leaving the preceding gusset 32 (comprising dividing plate 33) of core bar 3.Then core bar 3 promptly is locked in the syringe 1 and can not extracts (shown in Fig. 1 Lower Half) out.This moment, the core bar 3 of pulling back moved behind the dividing plate 33, and end face 331 will be obstructed because of contacting with lock sleeve 4 front end faces 42 thereafter.Know by aforementioned: lock sleeve 4 by resistance ring 122 restriction can not after move, thereby core bar 3 promptly is locked in the syringe 1, can not after move.Pull back as forcing, core bar 3 will rupture and self-destruction with joint pin 34 places of 36 of back gussets at median septum 33.Thereby the disposable instructions for use of implementation structure, function.(as shown in Figure 5).

As can be seen: low dose of self-destruction (self-locking) formula of this patent syringe has following characteristics:

1) perfect in shape and function, self-locking, self-destruction performance are good, can satisfy disposable instructions for use fully;

2) structure is more succinct, and production technology is good, and the mould difficulty is low, make easy to assembly, the yield rate height, cost is lower;

3) easy for operation, the power of injecting changes little (basic identical with ordinary syringe);

4) low from loss rate, easily accepted by hospitalized patients

Therefore this low dose of self-destruction (self-locking) syringe has good popularizing application prospect.

Claims

1. a low dose of self-destruction (self-locking) formula syringe, by needle tubing or syringe needle, syringe, lock sleeve, parts such as piston and core bar are formed: the front portion of core bar is union joint and preceding push pedal, the cross push rod that the middle part is made up of level and vertical gusset, hands is pressed at the rear portion, it is identical with common low dose of syringe that the syringe front portion is printed on the graduated part of injected dose, it is characterized in that:, there is a diameter augmenting portion at the syringe rear portion, its diameter of bore approximates the lock sleeve external diameter, one cross section resistance ring triangular in shape is arranged in endoporus, its internal diameter is less than diameter of bore, its front bevel and axis angle are bigger, and back bevel and axis angle are less; The lock sleeve shape is just like hollow collet, the front portion is the inclined-plane that inwardly shrinks and has three above elongated slots, its front end face is perpendicular to axis, the front end diameter of bore is slightly less than the core bar overall dimensions, and its cylindrical middle part has a circumferential clasp, the external diameter of snap ring slightly to equal syringe rear portion diameter of bore, the rear end face of snap ring is perpendicular to axis, lock sleeve rear end diameter of bore is greater than the core bar overall dimensions, and the rear appearance size is greater than hole dimension in the syringe rear portion, and the lock sleeve snap ring is positioned at before the syringe resistance ring; The crossed stiffened plate of core bar has two sections of certain size difference before and after making: preceding crossed stiffened plate overall dimensions is greater than lock sleeve front end diameter of bore, and less than lock sleeve rear end bore, crossed stiffened plate overall dimensions before its preceding push pedal and the union joint size that is connected with rubber piston all are not more than: crossed stiffened plate overall dimensions before back crossed stiffened plate overall dimensions is slightly less than.

2. low dose of self-destruction according to claim 1 (self-locking) formula syringe is characterized in that: the cross section of syringe resistance ring also can be trapezoidal.

3. low dose of self-destruction according to claim 1 (self-locking) formula syringe is characterized in that: connected by two centrosymmetric little joint pins of breaking between the forward and backward crossed stiffened plate of core bar.

4. according to claim 1) described low dose of self-destruction (self-locking) formula syringe, it is characterized in that: the clamp that connects once thin film is set on the fin of the rear end of syringe, a triangle stopper slot is set on gusset behind the core bar, its hypotenuse pro-, straight flange after.