CN2571394Y

CN2571394Y - Low residue syringe

Info

Publication number: CN2571394Y
Application number: CN 02256447
Authority: CN
Inventors: 王希平; 王宏; 王晓鹏
Original assignee: 王希平
Priority date: 2002-09-30
Filing date: 2002-09-30
Publication date: 2003-09-10
Anticipated expiration: 2012-09-30

Abstract

The utility model relates to a syringe with low residual amount, which is composed of a needle cylinder, a piston, a core bar and an internal-inserting type injection needle head. A connecting head of the front part of the needle cylinder is a hollow cone which can be connected with a standard needle head, and the center of the hollow cone is a cylindrical hole or a conical hole. The injection needle head is provided with a conical needle handle, wherein, the length of which is the same to the length of an inner hole of the connecting head of the needle cylinder. When the conical needle handle is pressed into the inner hole of the connecting head of the needle cylinder to implement tight matching, the inner hole of the connecting head of the front part of the needle cylinder is completely occupied by the conical needle handle, and injection residual amount is eliminated. The structure of the internal-inserting type needle head is simple, manufacture difficulty is approximate to the manufacture difficulty of the existing standard needle head, the structure of the needle cylinder is basically the same to the structure of an ordinary small-dose syringe, so the manufacture difficulty of a syringe is greatly lowered, production yield can be evidently raised, and production cost is lowered.

Description

The low residual amt syringe

This utility model relates to medical low dose of syringe, specifically relates to low dose of vaccine syringe syringe needle and syringe head syndeton, belongs to medical instruments field.

Current society, the preventive medicine development is very rapid, and vaccine syringe (belonging to extraordinary low dose of syringe) consumption is increasing, and is more and more higher to vaccine (comprising insulin) syringe performance demands, wherein the injection residual quantity had strict requirement.Vaccine (comprising insulin) syringe adopts integral structure more at present, is about to syringe needle tube and directly is placed in the syringe front end, has cancelled injector syringe to the liquid passage excessively between needle tubing, thereby residual quantity can have been reduced to very little.But this kind structure causes mould and produces and go up many difficulties, causes yield rate not high, and production cost is high.And common low dose of syringe (is that the internal taper hole on the standard syringe needle holder is installed on the standard outer cone union joint of syringe front end generally≤1ml), thereby the manufacturing of this type of low dose of syringe is comparatively simple, convenient, the yield rate height, production cost is lower, but its bigger residual quantity does not satisfy the requirement of vaccine injection.

The utility model proposes a kind of new low residual amt syringe construction for this reason, its objective is when guaranteeing the low residual amt requirement, can significantly reduce the production difficulty of vaccine (comprising insulin) syringe again, improve yield rate, thereby reduce manufacturing cost.

The purpose of this utility model is achieved like this:

A kind of low residual amt syringe is made up of syringe, piston, core bar, injection needle, and the forward union joint of syringe is the hollow cone that can be connected with standard needle; Injection needle is made up of injection needle and needle holder, needle holder is made up of than the small cone body needle handle reaching than the large cylinder seat of band endoporus: the center of syringe union joint is a cylindrical hole or conical bore, its minimum-value aperture is slightly larger than or equals the cone needle handle end diameter of needle holder, and its maximum diameter of hole is slightly less than or equals the cone needle handle outside diameter of needle holder.

The length of needle stand cone needle handle is consistent with hole length in the syringe link head.

Needle handle also can be and the face of cylinder of syringe endoporus same diameter, on its surface one annulus projection arranged, and circle diameter is slightly larger than syringe front end diameter of bore

This utility model low residual amt syringe needle barrel structure is identical with common low dose of syringe, needle handle is pressed into syringe union joint endoporus and realizes close-fitting, and the length of fit unanimity, thereby this interpolation type needle handle occupied the anterior link head endoporus of syringe fully, promptly eliminated injection residual quantity space.The cone of needle stand (or cylinder of band bulge loop) needle handle, in being pressed into syringe link head endoporus, will produce the cooperation interference, because syringe and needle handle are made by plastics, thereby control the suitable magnitude of interference and both can guarantee reliable sealing, can guarantee enough bonding strengths again.

The manufacturing of this utility model syringe needle and standard needle (jacket-type) are basic identical

When satisfying the requirement of vaccine syringe low residual amt, the difficulty of vaccine syringe manufacturing is reduced from above this scheme as can be seen significantly, can significantly improve the rate of manufacturing a finished product, thereby reduce production cost effectively.Because only syringe needle is different with common low dose of syringe, thereby make vaccine syringe and common low dose of syringe production that good compatibility be arranged, help the unification of mould, the simplification of production management, thus further improved production efficiency, reduced production cost.

The common low dose of syringe front portion structure sketch map of Fig. 1

Fig. 2 insulin (vaccine) syringe front portion structure sketch map

The low residual amt syringe front portion structure sketch map of Fig. 3 this patent

The needle holder structural representation of Fig. 4 this patent

Needle holder another program structural representation of Fig. 5 this patent

The general low dose of injector syringe head construction sketch map of Fig. 6

Marginal data 1 syringe; Stack shell 11 union joints 12 outer conical surface 121 union joint endoporus 122

Front end face 123 union joint endoporus rear end faces 124 internal taper holes 125

Needle guard joint pin 132 core bars 3 rubber pistons; Preceding conehead 31 piston bodies 324 standard needle; Needle stand handle 41 needle stand mating holes 424 ' interpolation type syringe needle; Needle handle 41 ' taper seat 411 ' back taper hole, back 412 '

Cylindrical seat 42 ' periphery 421 ' preceding taper hole 422 '

Spacing end face 423 ' front end face 43 ' endoporus 44 ' rear end face 45 ' 5 needle tubings 6 binding agents 7 needle guards

Go through this utility model scheme below in conjunction with legend

Fig. 1 is common low dose of injector head structural representation, is made up of syringe 1, core bar 2, piston 3, syringe needle 4.Syringe 1 front end union joint 12 is parts that syringe 1 is connected with syringe needle 4, and its outer surface is the taper seat 121 of 6: 100 taperings.In order to reduce residual quantity, the front end of piston 3 is got rid of the part medicinal liquid in syringe 1 union joint 12 endoporus 122 to reduce the injection residual quantity in the endoporus 122 when injecting terminal point with nose cone 31.Syringe needle 4 is canonical forms, thereby replacing is comparatively convenient.And the production of syringe and syringe needle is all comparatively easy, the yield rate height, thereby production cost is low.But, can not satisfy the requirement of vaccine (insulin) syringe because gapped space between syringe needle 4 endoporus bottom and syringe front end face causes residual liquid more.

Fig. 2 is that vaccine (insulin) is used syringe, and itself and the ordinary syringe main distinction the most are; Injection needle 5 is directly installed in syringe 1 front end union joint 12 endoporus and with binding agent 6 needle tubing 5 and syringe 1 is cemented.Protection needle guard 7 is enclosed within on the syringe front end joint pin 13.As can be seen, this syringe is in injection during terminal point, almost noresidue quantity space (being the very little space of the gas collection conical surface 125 at the most).Because needle tubing 5 is very thin, promptly the endoporus of syringe 1 front end 12 is also very little, cause the syringe mould complex structure not only that contains tiny core, and the life-span is not long yet, and injection-molded finished rate is a greater impact.The same reason easily produces waste product because needle tubing 5 is very thin with syringe 1 assembling the time, this will bring the loss that comprises the syringe 1 that accounts for syringe cost major part, thereby the production difficulty of present this syringe is big, the production cost height.

Fig. 3 be the low dose of syringe construction sketch map of this utility model low residual amt (the irrelevant structure of figure postmedian is omitted) this syringe and the common low dose of syringe of Fig. 1 structure of comparing its syringe 1 is basic identical as can be seen, just change needle stand 4 into interpolation type by jacket-type.

Needle stand 4 shown in Figure 4 ' by cylinder seat 42 ' with circular cone needle handle 41 ' form.Cylinder seat 42 ' diameter greater than cone 41 ' outside diameter, with the insertion depth (referring to Fig. 3) of restriction circular cone needle handle 41 ' in syringe 1 front end endoporus 122.Circular cone needle handle 41 ' point diameter be slightly less than the port diameter of the front end endoporus 122 of syringe 1 so that insert easily during assembling.And its outside diameter is slightly larger than the port diameter of endoporus 122.Therefore when with behind the conical surface 411 ' be pressed in the hole 122, promptly can force hole 122 expansions, thereby produce trivial tight effect and sealing function, select the magnitude of interference (as 0.1mm) can obtain to satisfy the sealing requirements and the steadiness requirement of use rightly.Needle stand 4 ' endoporus 44 ' diameter is identical with needle tubing 5 external diameters, and in order to needle tubing 5 to be installed, fitting depth flushes with back taper hole 412 ' bottom with needle tubing 5 rear ends and exceeds.Preceding taper hole 422 ' be to be provided with for the convenient needle tubing 5 of installing.Back taper hole 412 ' be to be convenient injection front exhaust.

For further improving sealing and steadiness, also can adopt scheme shown in Fig. 5 ': with mating surface 411 ' make cylindrical, its outside dimension is identical with hole 122, but make in mating surface 411 ' front portion an annular projection 46 ', this annular diameter should be slightly larger than hole 122 internal diameters (as 〉=0.1mm) then when with mating surface 411 ' be pressed in the hole 122, ring surface 46 ' can cause that hole 122 local deformations are from producing effective seal and fastening effect.

Because needle stand mating surface 411 ' with hole 122 equal length, be behind the needle stand 4 ' in being pressed into the preceding hole 122 of syringe, needle stand 4 ' spacing end face 423 ' will prop up syringe 1 front end face 123, needle stand bottom surface 45 ' also will align with the rear end face 124 in syringe hole 122, this shows that this syringe is the same with vaccine syringe shown in Figure 2 once assembling back, after injecting with little medicinal liquid residual quantity.

Can find out that this scheme has the advantage of above-mentioned existing two schemes concurrently:

1. the utility model low residual amt low-dose injector can reach vaccine (comprising insulin) Syringe is to the strict demand of parenteral solution residual quantity.

2. as the most complicated, the syringe that cost is the highest of syringe, this programme injector syringe Manufacture difficulty is far below existing vaccine syringe shown in Figure 2, and with shown in Figure 1 common Low-dose injector is identical, thereby production difficulty, yield rate, cost are also close.

3. the interpolation type needle head structure is simple, and manufacture difficulty is close with the existing standard syringe needle, thereby becomes Product rate height, low cost of manufacture.

4. this syringe needle barrel structure and common low-dose injector are basic identical, this common low-dose injector that two kinds of production difficulties of script are differed greatly is consistent on topmost production link with vaccine syringe, thereby can simplify organization of production, reduce production costs

This programme is guaranteeing that the vaccine syringe residual quantity requires to reduce and produce simultaneously in sum Difficulty has improved yield rate, Decrease production cost. Has good application value.

Claims

1 one kinds of low residual amt syringes are made up of syringe, piston, core bar, injection needle, and the forward union joint of syringe is the hollow cone that can be connected with standard needle; Injection needle is made up of injection needle and needle holder, it is characterized in that: needle holder is made up of than the small cone body needle handle reaching than the large cylinder seat of band endoporus; The center of syringe union joint is a cylindrical hole or conical bore, and its minimum-value aperture is slightly larger than or equals the cone needle handle end diameter of needle holder, and its maximum diameter of hole is slightly less than or equals the cone needle handle outside diameter of needle holder.

2 according to the low residual amt syringe described in the claim 1, it is characterized in that: the length of needle stand cone needle handle is consistent with hole length in the syringe link head.

3 according to the low residual amt syringe described in the claim 1, it is characterized in that: needle handle also can be and the face of cylinder of syringe endoporus same diameter, on its surface one annulus projection arranged, and circle diameter is slightly larger than syringe front end diameter of bore.