CN2654142Y

CN2654142Y - Needle retractable safety injector

Info

Publication number: CN2654142Y
Application number: CN 200320100558
Authority: CN
Inventors: 谢欣珀; 何其泽; 王识钧
Original assignee: Suide Medical Material Sci & Tech Co Ltd
Current assignee: Suide Medical Material Sci & Tech Co., Ltd.
Priority date: 2003-10-15
Filing date: 2003-10-15
Publication date: 2004-11-10
Anticipated expiration: 2013-10-15

Abstract

The utility model discloses a safety injector with a retractile pinhead and comprises a hollow syringe, a handspike which is inserted in the syringe, a card and a leak proof ring that are sleeved on the inserting end of the handspike, and a pinhead which is combined with the front end of the pinhead; wherein, the inner circumference of the syringe which is far from the injection end is provided with a convex ring which protrudes along the dadial direction a little, when the handspike is inserted into and assembled in the syringe, the card appears a retractation state, when the medical staff push the handspike to the end at the use beginning, the card is not able to combine with the pinhead base, and when the handspike is back pumped and the pinhead pumping the liquid medicines and the card withdraws to the position of the convex ring, the end of the card protrudes with help of the convex ring. So when the handspike is pulled forwards again to the end during injection, the convex card can be used for combining with the pinhead base and the pinhead base as well as the pinhead are pulled and retracted into the syringe.

Description

Retractable needle formula safety injector

Technical field

It is central in order to medium is inputed or outputed the utensil of human body that this utility model relates to a kind of medical device, refers in particular to a kind of retractable needle formula safety injector.

Background technology

For fear of used syringe needle stab medical personnel or the cleaning garbage personnel and cause disease propagation, therefore there is the dealer to design a kind of syringe needle can being used and finishes the safety injector that is retracted to syringe inside afterwards, wherein also is no lack of the monopolist of getting permission, see all each approved safety injector patent cases, be butted on greatly before the push rod of syringe inside and be made as concavo-convex the cooperation between the bar and needle holder, so that finish push rod is pushed into syringe foremost the time in injection, push rod is combined with needle holder, when push rod oppositely promotes to reset again, be about to needle holder together with needle retractable to syringe, with the syringe needle that prevents from the to give prominence to people of stabbing.

But, when practical operation, syringe but often takes place without use, the situation that its syringe needle has but been withdrawn and scrapped, its main cause is that medical personnel need push rod is pushed into foremost at the beginning of using, the syringe inner air is discharged, in order in the syringe needle insertion liquid medicine bottle injection being sucked in the syringe, yet, when medical personnel's syringe safe in utilization, often having ignored safety injector can not be pushed into push rod foremost, still with usual custom operation, the situation of scrapping to such an extent as to take place mistake that push rod is combined with needle holder.

Therefore, how providing a kind of makes push rod be pushed into syringe still to be unlikely to take place push rod and the bonded situation of needle holder foremost the time, really to be the design guideline of present stage safety injector.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of retractable needle formula safety injector, refer in particular to a kind of when push rod is pushed into foremost for the first time, be unlikely to combine and produce mistake and pull work, can avoid taking place syringe without using the retractable needle formula safety injector of promptly scrapping with needle holder.

For this reason, the utility model proposes a kind of retractable needle formula safety injector, it is provided with the syringe of a hollow, and in conjunction with the needle holder of a syringe needle, and the other end of syringe can insert for a push rod in the wherein end of syringe, wherein:

Needle holder is concaved with a tank towards an end of syringe inside;

Syringe is provided with the prominent ring that is radially outstanding away from an end inside of syringe needle;

Push rod has a rod body part, the end that described rod body part is inserted syringe is provided with a head, the free end face of head is established the seal ring that can be close to the syringe inwall, the end face central shaft of this head is to a recessed storage tank, establish respectively in periphery two opposite ends of head again one radially place and communicate with storage tank first wear groove, second and wear groove, this second end of wearing the contiguous rod body part of groove is provided with one and has the clamping slot of width greatly, and the storage tank inner peripheral that is positioned at the clamping slot scope is provided with an internal projecting ring;

One fastening convex side, it is provided with a main body that is incorporated in the storage tank, the free-ended end of head that main body is positioned at push rod is provided with a joint that cooperates blocking with the tank of needle holder, main body other end outer peripheral edges radially are equipped with a baffle ring and are placed through first respectively, second wears first catch of groove, second catch, first, the periphery distance bound of second catch is between the internal perisporium and prominent ring of syringe, and wear in groove and the clamping slot first the position, the internal projecting ring and second that the baffle ring of described fastening convex side can be arranged at the storage tank of push rod keeps off between the edge, the joint of described fastening convex side and cervical region can be stretched on the free end face of head, the baffle ring of this fastening convex side can be positioned at the storage tank bottom land, and its joint is the retraction shape.

Aforesaid retractable needle formula safety injector, an end of the contiguous head of the rod body part of described push rod is provided with the less portion of blocking of an external diameter.

Aforesaid retractable needle formula safety injector, the head of described push rod away from the end face of rod body part be provided with an external diameter less, can supply the sheathed socket part of seal ring.

Aforesaid retractable needle formula safety injector, the tank port of described needle holder is provided with the less bead of a bore, then is provided with a cervical region that cooperates blocking with this bead between the joint of described fastening convex side and the main body.

Aforesaid retractable needle formula safety injector, the external diameter of the joint that is provided with on the described push rod main body less than the tank internal diameter of needle holder greater than the internal diameter of bead.

Aforesaid retractable needle formula safety injector, described syringe is away from serve as reasons several sections the formed prominent ring of straight line of the inner prominent ring of syringe needle one end.

Characteristics of the present utility model and advantage are: the retractable needle formula safety injector that the utility model proposes, at the beginning of medical personnel are operating, push rod pushed away forward to the greatest extent and when air is drained, its fastening convex side is that the retraction shape is unlikely to combine with syringe needle, when drawing back push rod, can make the joint of fastening convex side outstanding, so finish and push rod is pushed away when most for the second time when injecting, outstanding joint promptly combines and syringe needle can be retracted in the retraction syringe with syringe needle, reaches the purpose of retracted needle.

In addition, this utility model further is provided with the less portion of blocking of an external diameter with contiguous this end of head of the rod body part of push rod, can fracture from this portion of blocking after the syringe needle withdrawal, avoids syringe needle is released once again.

Description of drawings

Fig. 1 is a three-dimensional appearance sketch map of the present utility model;

Fig. 2 is a perspective exploded view of the present utility model;

Fig. 3 pushes away most three-dimensional appearance sketch map forward with push rod for the first time for this utility model;

Fig. 4 for this utility model with the part plan generalized section of push rod when pulling back;

Fig. 5 is that this utility model is with the past part plan generalized section of pulling back and fastening convex side partly being given prominence to of push rod;

Fig. 6 is the partly outstanding three-dimensional appearance sketch map of fastening convex side of the present utility model;

Fig. 7 makes fastening convex side and the bonded part plan generalized section of needle holder to the greatest extent for this utility model pushes away push rod for the second time;

Fig. 8 draws back push rod the three-dimensional appearance sketch map that makes the syringe needle retraction for this utility model;

The three-dimensional appearance sketch map that Fig. 9 fractures push rod for this utility model.

The drawing reference numeral explanation:

10, syringe 11, refer to collude sheet 12, binding end 14, prominent ring

20, push rod 21, rod body part 210, block portion 22, head

23, socket part 24, storage tank 241, internal projecting ring 25, first are worn groove

26, second wear groove 261, clamping slot 262, the first retaining edge 263, the second retaining edge

30, fastening convex side 31, main body 310, baffle ring 32, joint

320, cervical region 33, first catch 34, second catch 40, seal ring

50, syringe needle 51, needle holder 510, tank 511, bead

The specific embodiment

See also shown in Fig. 1,2, retractable needle formula safety injector provided by the utility model, it comprises that the syringe 10, of a hollow is inserted in the syringe needle 50 that syringe 10 interior push rod 20, a fastening convex side 30 that is sheathed on push rod 20 insertion ends and seal rings 40 and are incorporated into syringe 10 front ends.Wherein, described syringe 10 is provided with one away from the inner peripheral of dispensing end and slightly is radially outstanding prominent ring 14 (it also can be several sections straight lines and forms), is positioned at fastening convex side 30 on the push rod 20 with cooperation.When push rod 20 insertions are assembled in syringe 10 inside, fastening convex side 30 passing can be retraction state (promptly as shown in Figure 1) by outstanding prominent ring 14, so when at the beginning of the healthcare givers uses, push rod 20 being passed forward as shown in Figure 3, fastening convex side 30 is unlikely to combine with the needle holder 51 of syringe needle 50, again when push rod 20 back is drawn into during by syringe needle 50 aspiration medicinal liquids, when fastening convex side 30 retreats to prominent ring 14 positions as shown in Figure 4, promptly being obstructed and encircling 14 by dashing forward makes fastening convex side 30 as Fig. 5, be standing shape shown in 6, so once again push rod 20 is released forward together with fastening convex side 30 when when injection, promptly can be equipped in needle holder 51 by outstanding fastening convex side 30 front ends as shown in Figure 7, needle holder 51 is retracted in the retraction syringe 10 as shown in Figure 8 together with syringe needle 50 by push rod 20.

Above-mentioned is general introduction of the present utility model, and its detailed structure is then addressed as the back with action:

Please consult shown in Figure 1 again, described syringe 10 can adopt known structure with syringe needle 50, syringe 10 wherein an end week side be provided with outstanding finger and collude sheet 11, collude with finger for medical personnel and to hold and make things convenient for the application of force, the other end is provided with the binding end 12 of convergent, and a wherein end of syringe needle 50 then is provided with uses the needle holder 51 that is incorporated in the binding end 12.By as can be known shown in Figure 7, this end center that described needle holder 51 is incorporated into binding end 12 is arranged with a tank 510 in addition, and the opening of this tank 510 is provided with the less bead of bore 511, and it can cooperate blocking with described fastening convex side 30.The described prominent ring 14 of being located at syringe 10 inside is positioned at contiguous sheet 11 these ends that refer to collude, and prominent ring 14 only protrudes in the internal perisporium of syringe 10 slightly.

Described push rod 20 has section and is cross rod body part 21, wherein end in rod body part 21 is provided with the cylindrical head 22 that can be inserted in the syringe 10, the outer peripheral edges of described rod body part 21 and head 22 are less than prominent ring 14 internal diameters of syringe 10, this end face that described head 22 differs from rod body part 21 is provided with the less socket part of an external diameter 23, be inserted in for described seal ring 40, described seal ring 40 forms sealing effectiveness so that its outer peripheral edges are urgent in syringe 10 inwalls for omiting the elastic colloid object of tool.In addition from the socket part 23 end face central shaft to recessed one storage tank 24 that extends to head 22, establish respectively in the head 22 and periphery two opposite ends of socket part 23 again one radially place and communicate with storage tank 24 first wear groove 25, second and wear groove 26, this first, second wear groove 25,26 and storage tank 24 has same depth.Described second wears groove 26 is positioned at head 22 these ends and forms a fan-shaped clamping slot 261 that has than big width, clamping slot 261 contiguous rod body part 21 should form the first retaining edge 262 by end, contiguous socket part 23 these ends then form the second retaining edge 263, the setting that described storage tank 24, first is worn groove 25, clamping slot 261 is for confession fastening convex side 30 places, and fastening convex side 30 can be moved axially in clamping slot 261.

What described fastening convex side 30 length approximated push rod 20 places groove 24 degree of depth, it has a cylinder-shaped body 31, this main body 31 can be worn groove 26 these sides by second of push rod 20 heads 22 and radially is placed through in the storage tank 24, this end of 23 is provided with an outstanding circular joint 32 to described main body 31 towards the socket part, be provided with the less cervical region of an external diameter 320 between this joint 32 and the main body 31, radially prominent first catch 33 of establishing a retaining edge 310 and being located at the opposite end of other end outer peripheral edges, second catch 34, this is first years old, two

catch

33,34 are placed through first of push rod 20 respectively wears groove 25, clamping slot 261, the axial length of described clamping slot 261 is at least when main body 31 and is subjected to that prominent ring 14 stops and when rising, can make joint 32 protrude from quite height of storage tank 24, so that joint 32 can be interlocked with the bead 511 of tank 510, make first, two

catch

33,34 can wear in groove 25 and the clamping slot 261 first respectively and move axially.In addition, the periphery of first,

second catch

33,34 distance is the boundary between the inner peripheral of syringe 10 and prominent ring 14 internal diameters, makes first,

second catch

33,34 be subjected to the pushing and pressing of prominent ring 14 and wears in the scope of groove 25 and clamping slot 261 mobile first.The storage tank 24 that is positioned at clamping slot 261 scopes is provided with an outstanding slightly internal projecting ring 241, this internal projecting ring 241 is to the spacing of clamping slot 261 second retaining edge 263, be slightly larger than baffle ring 310 width of fastening convex side 30, when the baffle ring 310 of fastening convex side 30 is between the internal projecting ring 241 and the second retaining edge 263, the joint 32 that is positioned at the other end and cervical region 320 are for protruding in push rod 20 end faces, as shown in Figure 7, and can combine with the tank 510 of needle holder 51, in joint 32 near the external diameter at cervical region 320 places less than the internal diameter of tank 510 greater than the internal diameter of bead 511, so joint 32 is relaxed state when being incorporated in the tank 510.

Above-mentioned is detailed structure narration of the present utility model, and the action when it uses is addressed as the back:

Please consult shown in Fig. 1,2 again, when inserting the head 22 of push rod 20 in the syringes 10 at the beginning of the use, first,

second catch

33,34 of described fastening convex side 30 slightly is subjected to being stretched on the block of the prominent ring 14 of syringe 10 inner peripherals, push rod 20 is continued to push away toward in, get final product so that syringe 10 slightly supports by elasticity, first catch 33 and second catch 34 are passed forward by prominent ring 14, because this moment, fastening convex side 30 was the retraction shape, when air being discharged, still can not combine with the needle holder 51 of syringe needle 50 so medical personnel push away push rod 20 forward to the greatest extent as shown in Figure 3.

When medical personnel's desire sucks medicinal liquid and with push rod 20 during toward pumpback, when fastening convex side 30 retreats to prominent ring 14 positions of syringe 10, as shown in Figure 4, first catch 33 of fastening convex side 30, second catch 34 is subjected to the block of prominent ring 14, when push rod 20 continues to extract out, promptly make first of fastening convex side 30,

second catch

33,34 as Fig. 5, fall within shown in 6 between the second retaining edge 263 of internal projecting ring 241 and clamping slot 261, and by the block effect of internal projecting ring 241 with baffle ring 310, fastening convex side 30 can't displacement, outside the joint 32 and the cervical region 320 of fastening convex side 30 protrudes in, when injection, once again push rod 20 is released forward together with fastening convex side 30, to be injected finishing promptly can be placed through in the tank 510 of needle holder 51 by outstanding joint 32 as shown in Figure 7, and by being snapped in the cervical region 320 of fastening convex side 30, bead 511 forms bonding state, when push rod 20 is drawn back as shown in Figure 8, promptly together with needle holder 51, in the syringe needle 50 retraction syringes 10, the syringe needle of avoiding exposing 50 people of stabbing.

As Fig. 1 and shown in Figure 9, in order to shorten with finishing depleted push rod 20 length, and avoid push rod 20 inadvertently to be released forward, so rod body part 21 contiguous head 22 these sections in push rod 20 are made as the narrower portion of blocking 210 of section, after syringe needle 50 retractions, can be as shown in Figure 9 fracture, make 50 at syringe needle in syringe 10, hurt sb.'s feelings and can't release again from the portion of blocking 210 of push rod 20.

From the above, when structure of the present utility model can make medical personnel operate, push rod is pushed away forward when to the greatest extent air being drained for the first time, be unlikely to combine, when injection finishes and push rod is pushed away when most for the second time, promptly combine and syringe needle is withdrawn with syringe needle with syringe needle.So having overcome known configurations, structure of the present utility model generally pushes away when most the shortcoming that combines with syringe needle and scrap for the first time, so can avoid losing syringe because of operate miss at push rod.

Claims

1. retractable needle formula safety injector, it is provided with the syringe of a hollow, and in conjunction with the needle holder of a syringe needle, and the other end of syringe can insert for a push rod, it is characterized in that in the wherein end of syringe:

Needle holder is concaved with a tank towards an end of syringe inside;

2. retractable needle formula safety injector as claimed in claim 1 is characterized in that: an end of the contiguous head of the rod body part of described push rod is provided with the less portion of blocking of an external diameter.

3. retractable needle formula safety injector as claimed in claim 1 or 2 is characterized in that: the head of described push rod away from the end face of rod body part be provided with an external diameter less, can supply the sheathed socket part of seal ring.

4. as claim 3 a described retractable needle formula safety injector, it is characterized in that: the tank port of described needle holder is provided with the less bead of a bore, then is provided with a cervical region that cooperates blocking with this bead between the joint of described fastening convex side and the main body.

5, retractable needle formula safety injector as claimed in claim 1 is characterized in that: the external diameter of the joint that is provided with on the described push rod main body less than the tank internal diameter of needle holder greater than the internal diameter of bead.

6, retractable needle formula safety injector as claimed in claim 1 is characterized in that: described syringe is away from serve as reasons several sections the formed prominent ring of straight line of the inner prominent ring of syringe needle one end.