CN2894714Y

CN2894714Y - Safety syringe

Info

Publication number: CN2894714Y
Application number: CN 200620002189
Authority: CN
Inventors: 徐志光
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-02-09
Filing date: 2006-02-09
Publication date: 2007-05-02
Anticipated expiration: 2016-02-09

Abstract

The utility model discloses a safety injector, including 1) an injection barrel which is hollow and positioned in the front side of the injection barrel with a through hole whose inner diameter is smaller than the injector cavity, 2) a snap-fit base consisting of a sleeve made of hard materials and a seal made of rubber, wherein the sleeve is posted in from the cavity opening and then touches the furthest depth under the support from the front end of the sleeve and thorough hole, the rear end of the sleeve is coupled with and by the rubber seal in the shape of a U-shaped groove, under the seal a snap-fit part and a snap-touch part are arranged between the snap-fit base and the seal, 3) a needle unit including a needle base and needle insert arranged in this base, the needle unit contacts the sleeve front end, 4) a pushing rod arranged in the injection cavity and gliding straight in relative to the injection barrel, and the front end of the pushing rod is provided with a rabbet which can be snapped on the snap-fit part. Due to that the sleeve is covered with rubber, when the sleeve and the barrel are assembled, the plastic of rubber materials can lower the precision requirements and provides the functions of tight contact, thereby increasing the finish product ratio and lowering the mold cost.

Description

Safety injector

Technical field

This utility model relates to a kind of safety injector, refers to that especially a kind of assembling simplifies, has concurrently again the improvement syringe of assembling elaboration, belongs to the medical treatment consumptive materials technical field.

Background technology

The TaiWan, China application number is 92119839 safety injector, mainly be more to simplify for the structure of the clamping base unit that reaches syringe, and then the generation assembly is easy, reduce the purpose of processor, the clamping base unit of this safety injector, by a sleeve member and a sealing member straight forming, this sleeve member also has a rigid plastics outer sleeve body, and the interior body made of the rubber material that is sheathed on outer sleeve body inside, interior body inner edge forms the holding section that protrudes out in one day, form one when the tenon of push rod front end pushes and fasten marriage relation, by above-mentioned by interior, the structural design of the sleeve member collocation sealing member that outer sleeve body is formed, can make push rod and clamping base unit fasten combination mutually, be beneficial to needle unit and pull back to injection tube, be recovered secondary with the syringe needle after preventing to inject and use.

The clamping base unit of above-mentioned known syringe though can utilize a plastic wrapper body and the interior body of a rubber etc. to simplify structural design, reaches to produce and assembles advantages such as reaching the minimizing manufacturing procedure easily, also has the much anxious improved shortcomings for the treatment of:

1, associativity is poor: adopt and directly penetrate plastic wrapper body and the interior body of rubber that coats, because of plastics different with the rubber coefficient, the combination stability that penetrate to coat is relatively poor naturally, and only inboard and bottom combine linking steady character deficiency between then interior outer sleeve body to body with the outer sleeve body coating in adding.

2, adaptation is poor: from the above, combine with outer sleeve body because interior body is only inboard, under the insufficient situation of combination stability, once needle body pass through by force in during the holding section of body, then cause the insufficient interior body retraction inwardly of associativity easily, so that interior outer sleeve body root edge junction can produce micro gap, and this also is the main cause that causes medicinal liquid to ooze out in the injection process.

3, assembling difficulty height: in the above-mentioned patent, because of this outer sleeve body is generally the PP material, so when outer sleeve body and syringe when assembling that is similarly the PP material, this need have preferably precision to reach between the two to closely cooperate, therefore die cost height, and product qualified rate is difficult for promoting.

Aforementioned three shortcomings, be present in No. the 092119843rd, Taiwan patent application and No. 093207428 equally, generally speaking, the Overmolded block base spatial design of body in known plastic sheath barrier part and the rubber, do not attain perfect construction design real the genus, and the block base cost burden that how to reach rubber, plastics formation alleviates the primary technical goal of pursuing of industry especially.

The utility model content

Main purpose of the present utility model provides a kind of plastic sheath barrier part of block base and more firm safety injector of coating marriage relation between rubber seal of allowing.

Another purpose of the present utility model provides a kind of block base and injection tube is assembled simple safety injector.

For achieving the above object, a kind of safety injector of this utility model comprises:

One injection tube is a hollow cylinder, and this injection tube front end is formed with the perforation of an internal diameter less than the injection tube room;

One block base, constitute by the sleeve member of a rigid material and the sealing member of a rubber material, wherein this sleeve member is inserted by the opening direction of room, and the leading section by sleeve member cooperates with perforation to hold and supports, this sleeve member rearward end coats fixed the closing of groove cover by rubber seal with U-shaped, and sealing part lower end is provided with a holding section;

One block holding part is located between block base and sealing member;

One needle unit includes a needle stand and is plugged in the interior needle body of needle stand, and this needle unit combines with the sleeve member front end;

One push rod is plugged in the injection tube room, and injection tube straight line slippage relatively, and the push rod front end is provided with a tenon that can be placed in the holding section.

Further, described sleeve member is a plastic material, central authorities form a projection at the sleeve member leading section, this projection and leading section internal face enclose structure and go out the alcove that is inserted in for needle stand, projection axially runs through one and is communicated with the sleeve member rearward end, wherein this block holding part forms a stop section at the ring wall surface of perforation, cooperates this stop section to be provided with a bulge loop that can Gong fasten on sealing member.

Further, described bulge loop is an O shape ring.

Further, described holding section goes to upper and lower the heeling condition of non-horizontal symmetry around an oblique axis.

After adopting said structure, safety injector of the present utility model be installed with block base in injection tube, constituted in order to the rubber seal that is sleeved on sleeve member by plastic sheath barrier part and, sleeve member includes leading section and rearward end, leading section is established combination for the needle unit spiral shell, the rearward end of hollow is then overlapped the sealing member of unification rubber material, in the sealing part sees through, outward, the U-shaped that following metope constitutes coats groove with in the sleeve member rearward end, outward, root edge three sides coat, and can make plastic sheath barrier part and rubber seal firmly be combined into novel block base as above-mentioned first effect; And wherein,, therefore, when sleeve member and injection tube assembling, can utilize the plasticity of this elastomeric material and reduce requirement, and have simultaneously and cooperate closely, improve yield rate and reduce the effect of die cost precision because of the outer rim of this sleeve member is rubber-coated material.

Description of drawings

Fig. 1 is this utility model STRUCTURE DECOMPOSITION sketch map;

Fig. 2 is this utility model overall appearance generalized section;

Fig. 3 is the local amplification profile sketch map of Fig. 2;

Fig. 4 pushes against profile status sketch map to lowermost end for this utility model push rod;

Fig. 5 is the profile status sketch map of this utility model push rod negative drawing and snap bar portion;

Fig. 6 is the outward appearance generalized section of this utility model embodiment two;

Fig. 7 is the push rod negative drawing of this utility model embodiment two and the profile status sketch map of snap bar portion;

Fig. 8 is another enforcement illustration of this utility model bulge loop.

[primary clustering symbol description]

1-----injection tube 2-----block base

3-----needle unit 4-----push rod

11----room 12----beam tube portion

121---perforation 13----spatial portion

131---stop section 21----sleeve member

211---projection 212---runner

213 ... alcove 215 ... accommodation space

22----sealing member 221---holding section

224---bulge loop 2241---shape ring

31----needle stand 32----needle body

33----lid 41----tenon

The specific embodiment:

This utility model safety injector as shown in Figure 1, this syringe comprises that an injection tube 1, is installed in block base 2, an inlay card in the injection tube 1 and is fixed on needle unit 3 in this block base, and be plugged in the injection tube 1 and with the injection tube push rod 4 of sliding relationship linearly, wherein:

Injection tube 1 is a hollow cylindrical body, hollow injection tube 1 inside is provided with a room 11, and front end is formed with the beam tube portion 12 of bringing shape together, these beam tube portion 12 inside have with room 11 and are connected, and be provided with the perforation 121 of a smaller aperture due, and this perforation 121 is with room 11 and enclose structure and go out a spatial portion 13, and these spatial portion 13 internal faces are provided with a step shape stop section 131;

Block base 2, comprise a rigid plastics sleeve member 21, this sleeve member 21 comprises a leading section and a rearward end, leading section central authorities are formed with the projection 211 of a default fabric width, the axle center of projection 21 1 is equipped with one and is communicated with the runner 212 of the big footpath of rearward end accommodation space 215, and encloses structure between projection 211 and leading section internal face and go out an alcove 213 and can supply a needle stand be installed with.

Sealing member 22, be the rubber material, be sheathed on the rearward end of sleeve member 21, this rubber material sealing member 22 that is sheathed on sleeve member forms a U-shaped and coats groove, in order to being coated on the rearward end of sleeve member, thereby can improve the linking steady character and the adaptation effectiveness of 22 of plastic sheath barrier part 21 and rubber seals;

The interior metope that the U-shaped of sealing member 22 coats groove has protruded out a holding section 221 inwardly with following metope joining place, holding section 221 can cooperate tenon 41 engagings of push rod 4, being beneficial to injection finishes when oppositely spurring push rod 4, can in the lump block base 2 be brought in the room 11 of injection tube 1, as for sealing member 22 wall faces and form the bulge loop 224 of corresponding stop section 131, constitute the block holding part of present embodiment by above-mentioned stop section and bulge loop.

Needle unit 3 has a needle stand 31 and is installed in the needle body 32 of these needle stand 31 inside, and needle body 32 outsides can be covered by a lid 33 covers, and this needle unit 3 is arranged at the block base front end.

One push rod 4 is plugged in the room 11 of injection tube 1, and push rod 4 front ends are provided with a tenon 41, and this tenon cooperates holding section 221, and after using block base is retracted.

During assembly, with reference to Fig. 2, shown in 3, earlier the needle stand 31 of needle unit 30 is inserted in the alcove 213 of sleeve member 21, again block base 2 is inserted by the room 11 lower opening directions of injection tube 1, make sleeve member 21 leading sections and fastening portions 12 perforations 121 be the tight fit relation, this sleeve member 21 is the end after spatial portion 13, the bulge loop 224 that then sees through solid rubber seal 22 wall faces of cover closely pastes with stop section 131 and supports, to prevent that the drug injection process in the room from producing the thing that medicament oozes out, again push rod 4 is inserted by room 11 opening directions, promptly constitute a complete syringe.

Shown in Fig. 4,5, during use, this tenon 41 fastens in the holding section 2 21 after injection finishes, therefore contract to the room 11 of injection tube 1 in the lump will needle unit 3 in the time of can be with the reverse post-tensioning of push rod 4 spurring, imposing a lateral pressure again can fracture the bar portion of push rod, make needle unit 3 and block base 2 be retained in the injection tube 1, and form the safety injector that can't secondary uses.

In addition, because of plastic sheath barrier part 21 outsides of block base 2 are coated by rubber seal 22 wall faces also, when block base 2 overlaps card with the beam tube portion 12 of injection tube 1, then can plastic sheath barrier part 21 can be combined closely with rubber seal 22 by rubber seal 22 with deformation behavior.

In addition, the wall face of rubber seal 22 ejection formations is formed with a bulge loop 224, and this bulge loop 224 has the effect of the O shape ring of leakproof, in addition, as shown in Figure 8, bulge loop of the present utility model also can be made as an independent O-shaped ring 2241 in addition, has identical effect equally.

Refer again to shown in Figure 67, another embodiment of block base of the present utility model, this embodiment and the foregoing description difference be, when providing block base to pull back to injection tube, can produce the skew effect automatically, exposes to prevent needle unit.

Its difference is in the rubber seal 22 of wrap barrier part 21 rearward end, the holding section 221 of its inner rim wall subtend projection inwardly, system forms the inclination holding section 221 of a upper and lower non-horizontal symmetry around an oblique axis, therefore when the tenon 41 of push rod 4 enters inclination holding section 221, can make the single side of 41 pairs of inner edge surfaces of tenon form the power of extruding outwardly, needle unit 3 be broken away from when perforations 121 contract room 11 to injection tube 10 in also can produce skew.

Claims

1, a kind of safety injector is characterized in that, comprising:

One block holding part is located between block base and sealing member;

2, safety injector as claimed in claim 1, it is characterized in that, described sleeve member is a plastic material, central authorities form a projection at the sleeve member leading section, this projection and leading section internal face enclose structure and go out the alcove that is inserted in for needle stand, projection axially runs through one and is communicated with the sleeve member rearward end, and wherein this block holding part forms a stop section at the ring wall surface of perforation, cooperates this stop section to be provided with a bulge loop that can Gong fasten on sealing member.

3, safety injector as claimed in claim 2 is characterized in that, described bulge loop is an O shape ring.

4, safety injector as claimed in claim 1 is characterized in that, described holding section goes to upper and lower the heeling condition of non-horizontal symmetry around an oblique axis.