CN201370853Y

CN201370853Y - Safety syringe

Info

Publication number: CN201370853Y
Application number: CN200920105451U
Authority: CN
Inventors: 王希平
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-09
Filing date: 2009-02-09
Publication date: 2009-12-30
Anticipated expiration: 2019-02-09

Abstract

The utility model relates to a safety syringe, which consists of a needle cylinder, a piston, a push rod, a needle seat, a safety sliding sleeve and the like, the piston and the push rod are identical to the ordinary syringe, the needle cylinder is also very similar to the ordinary syringe, the tail part of the needle seat is pressed in an inner hole at the front end of the needle cylinder, and the safety sliding sleeve is arranged at the front part of the needle cylinder. The front end surface of the safety sliding sleeve is positioned behind the needle seat before the use, thereby not affecting the injection operation; when the injection is completed, the safety sliding sleeve is pushed to the safety protection position and the safety sliding sleeve covers a hypodermic needle which is used, thereby realizing the safety protection function; and as a safety protection device is unrelated with the injection process, the safety protection device can not cause new pollution. The safety syringe has high safety, the safely sliding sleeve realizes safety protection, simple operation, stable positioning and reliable protection, the overall structure is simple, the processing and the assembly are convenient, the manufacturing cost is low, and the safety syringe is applicable to automatic assembly and can meet the requirements of mass production.

Description

A kind of safety injector

Technical field:

The present invention relates to a kind of safety injector structure, is after a kind of injection finishes, and needle point can be specially adapted to low dose of syringe by the safety injector of the safe sliding sleeve shielding of reach, belongs to medical instruments field.

Background technology:

In order to reduce because of contaminated needle point thorn, to scratch and infect the danger of pernicious infectious disease (as: hepatitis, acquired immune deficiency syndrome (AIDS) etc.), many safety injectors that can protect have been invented with the back syringe needle.

Such safety injector has a lot of patents at present, but most some potential safety hazards that exist, particularly the part that contacts with medicinal liquid is too much, easily causes drug contamination.And reduce these contaminations, tend to significantly increase production cost; The other design is very high to the physical dimension required precision of part, causes the bulk article performance to be difficult to be consistent.As the automatic safety injector of retraction of patent 200220028888.8 disclosed a kind of syringe needles, there are 7 parts to contact (whole parts comprise that the pin medicated cap is 10) with medicinal liquid, to guarantee obviously to contact that part all do not stain is very difficult with medicinal liquid.Before this external injection terminal point, the power of injecting has bigger increase, and this power of injecting variation tends to make by the injector and do not feel well.In addition, start the safety clearance, thereby the accurate control of injected dose is brought some inconvenience because piston nose must stay.These problems, such syringe has often, directly has influence on the safety and the production cost of the use of product.Though the safety injector of some safety slip shell types is also arranged on the market, most structures are comparatively complicated, and cost is higher; Particularly can be applicable to the low dose of widely low-cost safety injector of injecting of use seldom.The present invention proposes a kind of new low-cost safety injector design for this reason, in the hope of addressing the above problem preferably.

Summary of the invention:

The objective of the invention is: the safety injector that a kind of new needle point can fine shielding is provided, reaches simple for structure, easy, easily manufactured, purpose that cost is low safe in utilization.

The object of the present invention is achieved like this: a kind of safety injector, form by syringe, piston, push rod, needle stand, safe sliding sleeve etc., its piston and push rod and ordinary syringe are identical, safe sliding sleeve sky is enclosed within the syringe front portion, the needle stand afterbody is pressed in the syringe front end endoporus, it is characterized in that: the outer surface, garden of syringe front end is provided with two symmetric degree of deepening shallow slots, and described shallow slot is made up of darker leading portion groove, shallow stage casing groove and darker back segment groove; The head outer diameter of described needle stand approximates the external diameter of described syringe, and its rear portion cylindrical outer diameter is slightly larger than syringe front end diameter of bore; Described safe sliding sleeve is made up of external diameter less anterior cylinder and the bigger rear portion cylinder of external diameter, the internal diameter of described safe sliding sleeve is slightly larger than described needle stand head outer diameter, on the cylinder of safety sliding sleeve rear portion, have two pairs of grooves, thereby form two symmetric flexure strips, its width is slightly less than above-mentioned degree of deepening shallow slot width, described flexure strip afterbody place hole wall has inside annular protrusion, and the internal diameter of described annular protrusion is less than above-mentioned safe sliding sleeve barrel bore.

The degree of depth of the leading portion groove of the outer surface, garden of syringe front end degree of deepening shallow slot is more than or equal to the degree of depth of back segment groove.

The difference of the internal diameter of annular protrusion and above-mentioned safe sliding sleeve barrel bore slightly equals the degree of depth of syringe front end outer surface degree of deepening shallow slot back segment groove on the flexure strip afterbody inner hole wall that safety slip puts.

Safe as can be seen sliding sleeve is the front end that sky is enclosed within syringe, and the interior locating detent at its flexure strip rear portion drops on the back segment of aforementioned syringe degree of deepening shallow slot.Because flexure strip inwardly stretches out the locating detent height greater than the aforementioned shallow slot middle part degree of depth, slightly equals darker back segment groove depth, so can realize initial alignment in the position of back segment; The length of degree of deepening shallow slot on the syringe can make behind the safe sliding sleeve initial alignment its front end be positioned at position after the needle holder, in order to avoid the overslaugh puncture procedure.After injection finishes, promote the reach of safe sliding sleeve, owing between shallow slot back segment and the stage casing chamfered transition is arranged, thereby the locating detent of safe sliding sleeve flexure strip will outwards rise along the inclined-plane, because the elasticity of flexure strip makes locating detent can enter into the shallow slot stage casing smoothly.Under the restriction on groove edge, locating detent can move forward along shallow slot, enters into the darker leading portion of shallow slot.Press the needle stand head dimensions that cooperates with the syringe leading portion and equal the syringe external diameter, thereby safe sliding sleeve is limited, can not skid off the shallow slot leading portion.Be right angle (or tiltedly interior) step between shallow slot leading portion and the stage casing, thereby locating detent is defined and can not move forward and backward or rotate once shift degree of deepening shallow slot leading portion onto.Safe sliding sleeve front portion was stretched out forward and was surmounted the puncture needle tip this moment, had realized the protection to puncture needle, avoided unexpected injury.

Above-described as can be seen safety injector is a kind of sleeve type safety injector, because its core is a common syringe, injection safety and comfortableness are consistent with ordinary syringe.The structure of syringe needle preventer is very succinct, and security protection is easy and simple to handle, and initial alignment and security protection location are reliable.Easily be automated assembling.

Description of drawings:

Fig. 1 is the structural representation of this syringe

Fig. 2 is the sketch map that this Syringing is penetrated liquid

Fig. 3 is that this injector to inject finishes

Fig. 4 is the sketch map after this syringe is realized the needle safety protection.

Fig. 5 is this syringe slip cap axonometric chart.

Fig. 6 is this injector syringe stereoscopic figure

Specific implementation:

For the structure of safety injector of the present invention better is described, now be illustrated in conjunction with the accompanying drawings:

Fig. 1 is structural representation (before using), and its core is a common low dose of syringe.Form by syringe 1, push rod 2, piston 4.Syringe 1 front end is fastening to be equipped with forced needle stand 5; Needle guard 6 is sleeved on the needle stand 5; The safe sliding sleeve 3 that is slidingly installed outside syringe 1, safe sliding sleeve 3 is positioned at the initial position behind the needle stand 5.

Fig. 2 is a drawing liquid sketch map before the injection.This moment, safe sliding sleeve 3 still was in initial position.

In whole injection process, not relevant with security protection structure participates in injection process, and is in full accord with ordinary syringe, thereby has very high injection safety.

Fig. 3 injects the view that finishes.

Fig. 4 is after injection is finished, promote safe sliding sleeve 3 reaches, make it be positioned anterior security protection position, safe sliding sleeve 3 front end faces stretched out forward and surmounted puncture needle tip 531 this moment, realized security protection, prevented that exhausted needle point 531 from producing thorn, scratching harm puncture needle 53.

Fig. 5 is the stereogram of protective jacket 3, and figure below is the view that dissects after 1/4.The endoporus 33 of protective jacket 3 is slightly larger than the diameter of syringe cylindrical 11, and its front portion 31 is outside cylinder or cylindrical taper, and protective jacket 3 rear portions are big slightly hollow cylinders of diameter 32.Have 4 and penetrate groove 322 on rear portion 32, its length equals the length of rear portion cylinder 32.Article 4, groove 322 forms two elasticity positioning strips 321, at positioning strip 321 afterbodys the locating detent of inwardly stretching 3212 is arranged, and the length of locating detent 3212 is 1/5～1/2 length of elastic strip 3211 approximately, and it highly approximates the degree of depth of syringe 1 locating slot 123.

Fig. 6 is the structural representation of syringe 1; Figure below is the axonometric chart of syringe 1 leading portion.In syringe 1 cylindrical shell 11 anterior face degree of deepening shallow slot 12 is arranged, degree of deepening shallow slot 12 is made up of initial alignment groove 121, middle gathering sill 122, safe locating slot 123.Middle gathering sill 122 is the most shallow, and initial alignment groove 121 is darker, and safe locating slot 123 degree of depth are more than or equal to initial alignment groove 121; Transition inclined-plane (or cambered surface) 124 is arranged between initial alignment groove 121 and middle gathering sill 122, and the rear end face 1232 of safe locating slot 123 and side 1231 all are vertical or interior inclined-plane.The syringe front end has pilot hole 13 to be slightly less than needle stand 5 rear portions 52 outside diameters.

Syringe does not use preceding (Fig. 1), and the locating detent 3212 on the slip cap 3 is arranged in the initial alignment groove 121 on the syringe 1, and the front end face 34 of safe sliding sleeve 3 is positioned at the back of needle stand 5 heads 51 at this moment, can not influence the injection operation of syringe.

After injection finishes (Fig. 4), promote safe sliding sleeve 3 reaches, because the gathering sill 122 more shallow flexure strips 321 that cause outwards are out of shape, locating detent 3212 enters into 122 sections of gathering sills along excessive inclined-plane 124, under the constraint of gathering sill 122 sidewalls, locating detent 3212 will enter into safe locating slot 123 along gathering sill 122.Because safe locating slot 123 degree of depth slightly equal locating detent 3212 height, cause locating detent 3212 resiliences, fall back near or contact with safety locating slot 123 bottoms.As can be seen from Figure 4, this moment, protective jacket 3 front end faces 34 surmounted injection needle point 531 positions, had realized the security protection to puncture needle 53.

Locating detent 3212 is subjected to the head 51 of needle stand 5 in locating slot 123 rear end face 511 stops and can not move forward, it between 123 sections of shallow slots and the stage casing 122 right angle (or interior oblique) step, thereby locating detent is once shift 123 sections of safe locating slots onto, promptly be defined and move forward and backward, and the constraint that is subjected to 123 two sidewalls 1231 of locating slot can not side direction leave locating slot 123, thereby realized the reliable location of protective jacket 3 in the security protection position.

In sum, characteristics of the present invention are:

1. because safety device and injection process are irrelevant, can not cause the pollution of parenteral solution, so the present invention Safety injector injection safety height;

2. safety injector compact conformation of the present invention does not affect conventional injection operation;

3. safe sliding sleeve realizes that security protection is easy and simple to handle, positioning stablity, and protection is reliable;

4. safety injector terminal with compact integral structure of the present invention, process and assemble is convenient, low cost of manufacture;

5. safety injector of the present invention is fit to automatically assembling, can satisfy requirements of mass production.

Claims

1, a kind of safety injector, form by syringe, piston, push rod, needle stand, safe sliding sleeve etc., its piston and push rod and ordinary syringe are identical, safe sliding sleeve sky is enclosed within the syringe front portion, the needle stand afterbody is pressed in the syringe front end endoporus, it is characterized in that: the outer surface, garden of syringe front end is provided with two symmetric degree of deepening shallow slots, and described shallow slot is made up of darker leading portion groove, shallow stage casing groove and darker back segment groove; The head outer diameter of described needle stand approximates the external diameter of described syringe, and its rear portion cylindrical outer diameter is slightly larger than syringe front end diameter of bore; Described safe sliding sleeve is made up of external diameter less anterior cylinder and the bigger rear portion cylinder of external diameter, the internal diameter of described safe sliding sleeve is slightly larger than the external diameter of described syringe, on the cylinder of safety sliding sleeve rear portion, have two pairs of grooves, thereby form two symmetric flexure strips, its width is slightly less than above-mentioned degree of deepening shallow slot width, described flexure strip afterbody place hole wall has inside annular protrusion, and the internal diameter of described annular protrusion is less than above-mentioned safe sliding sleeve barrel bore.

2, a kind of safety injector according to claim 1 is characterized in that: the degree of depth of the leading portion groove of the outer surface, garden of described syringe front end degree of deepening shallow slot is more than or equal to the degree of depth of back segment groove.

3, a kind of safety injector according to claim 1 is characterized in that: the difference of the internal diameter of annular protrusion and above-mentioned safe sliding sleeve barrel bore slightly equals the degree of depth of above-mentioned syringe front end outer surface degree of deepening shallow slot back segment groove on the described flexure strip afterbody inner hole wall.