CN1063670C

CN1063670C - Safety syringe

Info

Publication number: CN1063670C
Application number: CN 94115887
Authority: CN
Inventors: 陈隆雄
Original assignee: Individual
Current assignee: Huang Wushun
Priority date: 1994-09-07
Filing date: 1994-09-07
Publication date: 2001-03-28
Anticipated expiration: 2014-09-07
Also published as: CN1118273A

Abstract

The present invention provides a safe practical safety injector. A drawing and pushing piston is arranged in a hollow needle cylinder, and a piston rod is connected with the piston and extends out from a lower opening of the needle cylinder. An eccentric plug rod head is convexly arranged on the piston, and an eccentric needle head plug bush is convexly arranged on the upper part of the needle cylinder in the position coaxially corresponding to the plug rod head. A needle head is plugged and clamped in the needle head plug bush, the lower part of the needle head is in an opening shape, and the plug rod head is plugged and clamped in or is disengaged from the opening on the lower part of the needle head. When the piston is pushed, physic liquor is jetted by squeezing, and after the injection is finished, the eccentric plug rod head which is convexly arranged on the upper part of the piston is clamped with a gap on the lower part of the needle head. When the piston is downwards pulled, the needle head is downwards dragged and is shrunk in the needle cylinder.

Description

A kind of safety injector

The present invention relates to a kind of medical apparatus and instruments, particularly a kind of syringe needle can be collected in the safety injector in the syringe.

Present syringe is by a cavity syringe, the syringe needle of plug-in mounting and the piston that is fitted in the hollow barrel constitute mutually with the syringe needle front end, the existing greatest problem of this syringe is after injection finishes, its syringe needle can not in be received in the syringe, therefore, not only unhygienic, but also dangerous.

Afterwards, a kind of syringe that overlaps protective jacket that adds on the syringe needle of having injected is arranged, its shortcoming is to use trouble, and the very easy loss of dropping of protective jacket.

Disclose a kind of syringe in No. 5242402 patents of the U.S., its syringe needle can the syringe of falling suction inside, but that its shortcoming is it is very inconvenient when using the different size syringe needle instead, be that syringe needle can not be general, in addition, its structure is also very complicated, and to use protective jacket, to cost is risen.

Purpose of the present invention just is to overcome the above-mentioned shortcoming and defect of existing in prior technology, and a kind of safety injector that a kind of syringe needle that changes the outfit is convenient, versatility is good, syringe needle conveniently can be taken in syringe or released from syringe is provided.

The objective of the invention is to realize by following technical scheme:

In a cavity syringe, be equipped with and take out push piston, piston rod links to each other with piston and leans out from the lower open mouth of syringe, epirelief one eccentric inserted link head on piston, with the syringe top epirelief of the coaxial correspondence position of inserted link head one eccentric syringe needle sleeve is arranged, the syringe needle plug-in card is in the syringe needle sleeve, the bottom of syringe needle is opening-like, the opening plug-in card or the disengaging mutually of inserted link head and syringe needle bottom, when promoting piston, medicinal liquid is squeezed and penetrates from syringe needle, and after injection finished, the eccentric inserted link head of piston top epirelief then fastened with the gap of syringe needle bottom, when drop-down piston, syringe needle then is pulled and contracts and ensconce in the syringe.

Therefore: remarkable result of the present invention is:

The 1st: syringe needle can be left behind and be contracted in the syringe synchronously with finishing of action of injection, and along with injection once more can be returned syringe needle again and is inserted in the syringe needle sleeve, not only safety, but also health.

The 2nd: the syringe needle bottom is that elastomer is made, thereby gap portion in its underpart can plug together with the inserted link head or break away from easily, and, be hinged relationship owing to plug together mutually, so syringe needle is crooked in the 360 degree scopes in syringe easily.

The the 3rd: can easily change the syringe needle of different specification size, enlarge the general interchangeability of the syringe scope of application and syringe needle.

The 4th: but as soon as possible medicament is drawn in the syringe within a short period of time with suction pipe that the syringe needle sleeve matches slotting, help the raising of injection efficiency.

Concrete structure of the present invention is realized by the following examples and accompanying drawing thereof

Fig. 1 is the section of structure before the present invention injects.

Fig. 2 is the section of structure after the present invention injects.

Fig. 3 is that the present invention injects the section of structure after receiving in the syringe needle of back.

Fig. 4 is that the present invention injects the section of structure when being extruded bending after the receipts in the syringe needle of back.

Fig. 5 is the three-dimensional structure diagram of syringe needle part among Fig. 1.

Structure enlarged drawing when Fig. 6 is syringe needle shown in Figure 5 and the inserting of piston tip inserted link head.

Fig. 7 is the structure enlarged drawing when being inclination after syringe needle shown in Figure 6 collapses in the syringe.

Fig. 8 is syringe and the preceding exploded view of piston in combination shown in Figure 1.

Fig. 9 is the construction profile figure after the syringe combination shown in Figure 8.

Figure 10 is the A-A profile of Fig. 2.

Section of structure when Figure 11 is the present invention and the combination of adapted suction pipe.

Below in conjunction with accompanying drawing 1-11 concrete structure of the present invention is described in detail.

The present invention has the syringe 1 of a hollow, the coaxial liquid extruding device 3 of having put in the syringe 1, liquid extruding device 3 is made of piston 31 and piston rod 35, syringe needle sleeve 12 interpolations on syringe 1 top are placed with syringe needle 2, it is characterized in that: piston 31 top epireliefs have an eccentric inserted link head 302, in eccentric position epirelief syringe needle sleeve 12 is arranged, offer pit 27 with the hypomere center of the syringe needle 2 of syringe needle sleeve 12 movable plug-in mountings with the upper wall 151 of the corresponding pin letter 1 of inserted link head 302 eccentric positions; What plug together with pit 27 activities is eccentric inserted link head 302.Referring to Fig. 5 to Fig. 8

Architectural feature of the present invention also is;

Central axis 300 eccentric distances of the centrage 200 of eccentric syringe needle sleeve 12 apart from the axial line 3011 of the eccentric distance of the axial line 100 of syringe 1 and eccentric inserted link head 302 apart from piston 31 equate, the pit that pit 27 slits for several hole slot strings, eccentric inserted link head 302 is positioned at the pit 32 of piston 31 top eccentric parts, the cylinder that the needle holder 22 of syringe needle 2 hypomeres is made for elastic plastic material, syringe 1 inwall offers the rib 17 of vertically leading spaced apart, and piston rod 35 leans out from the hollow syringe 1 of lower open mouth.Referring to Fig. 5 to Fig. 8

There is the annular snap rib 26 of an evagination in needle holder 22 stage casings of syringe needle 2, annular snap rib 26 and syringe needle sleeve 12 endoporus annular grooves 120 are inlay card mutually, and the pit 27 of syringe needle 2 hypomeres is by the logical groove 25 that slits along needle holder 22 overall diameters, the taper card open-minded 271 and 272 of two recessed serial connections constitutes along slot 25 centers outside.Referring to Fig. 5 to Fig. 7

The taper cards of two serial connections slit has angle of deflection between the axial line 200 of 271 and 272 centrage 270 and needle holder 22 bodies, is a taper dop 301 with eccentric rod inserted link head 302 tops of the open-minded 271 and 272 mutually movable plug-in cards of taper card.Referring to Fig. 5 to Fig. 7

The conical bottom periphery of the taper card open-minded 271 and 272 that two strings slit is skewed, and there is a chamfering 231 the foot gap porch of pit 27.Referring to Fig. 6, Fig. 7

The eccentric position of the eccentric pit 32 on piston 31 tops of liquid extruding device 3 is identical with the eccentric position of syringe needle sleeve 12 and plug together mutually with the afterbody of needle holder 22, and eccentric inserted link head 302 tops that are positioned at eccentric pit 32 centers are the dop 301 of a taper.Referring to Fig. 5 to Fig. 7

Piston rod 35 is the cross body of rod, and there is the protruding dish 37 of a push-and-pull lower end of the body of rod, and the upper flange 305 of piston rod 35 is mounted in together mutually with piston 31, and the cylindrical of piston 31 has an annular groove 311, and a position limiting convex ring 16 is arranged at the open syringe of infra 1 endoporus bottom.Referring to Fig. 8 to Figure 10

There is the handle 14 of an evagination at the lower open mouth place of columniform syringe 1, triangle or the oval plate body of the protruding dish 37 of the push-and-pull of piston rod 35 lower ends for there being one to put plane 371, the eccentric syringe needle sleeve 12 of roof 151 place's epireliefs of syringe 1 is a tubular, at the changeover portion 122 that syringe needle sleeve 12 and 10 perforations place of syringe inner chamber have a diameter to increase, the opening position of pit 27 has chamfering 231.Referring to Fig. 6, Fig. 9 and Figure 10

With eccentric syringe needle sleeve 12 mutually sleeve be a hollow straw 121, hollow straw 121 is to insert separately not in syringe needle sleeve 12 or join slotting with syringe needle 2.Referring to Figure 11

Using method of the present invention is as follows:

When using for the first time, can insert syringe needle 2 in the syringe needle sleeves 12, draw piston 31 outward, medicinal liquid 4 is inhaled in the syringe 1, interior then push piston bar 35 also penetrates piston 35 compression medicinal liquids.Referring to Fig. 1, when injecting liquid drug finishes, piston 31 has been pushed to the top of syringe 1 inner chamber 10, and the eccentric inserted link head 302 on piston 31 tops is just in time corresponding with the pit 27 of needle holder 22 hypomeres, as long as enforce piston 31 slightly, inserted link head 302 can insert in the elastic needle holder pit 27 from bottom to top.Referring to Fig. 2, at this moment since inserted link head 302 plug-in card is in needle holder, therefore, when drop-down piston 31, syringe needle 2 is drawn in the inner chamber 10 of syringe 1 together by inserted link head 302.Referring to Fig. 3, syringe needle 2 is inserted into sleeve 12 1 sides and pushes away on again, and syringe needle 2 can be ejected syringe again and insert again in sleeve 12, and as continue to go up push piston 31 by position shown in Figure 3, the distortion of then needle point 21 can being bent be stabbed human body in order to avoid it withdraws from.Referring to Fig. 4

As drawing medicinal liquid 4 fast, suction pipe 121 can be inserted in the sleeve 12, syringe needle 2 then can be inserted in the suction pipe 121.Referring to Figure 11

Claims

1, a kind of safety injector, the syringe (1) that one hollow is arranged, the coaxial liquid extruding device (3) of having put in the syringe (1), liquid extruding device (3) is made of piston (31) and piston rod (35), syringe needle sleeve (12) interpolation on syringe (1) top is placed with syringe needle (2), it is characterized in that: piston (31) top epirelief has an eccentric inserted link head (302), in eccentric position epirelief syringe needle sleeve (12) is arranged, offer pit (27) with the hypomere center of the syringe needle (2) of the movable plug-in mounting of syringe needle sleeve (12) with the upper wall (151) of the corresponding syringe of inserted link head (302) eccentric position (1); What plug together with pit 27 activities is eccentric inserted link head (302).

2, according to the described a kind of safety injector of claim 1, it is characterized in that: central axis (300) eccentric distance of the centrage (200) of eccentric syringe needle sleeve (12) apart from the axial line (301) of the eccentric distance of the axial line (100) of syringe (1) and eccentric inserted link head (302) apart from piston (31) equates, the pit that pit (27) slits for several hole slot strings, eccentric inserted link head (302) is positioned at the pit (32) of piston (31) top eccentric part, the cylinder that the needle holder (22) of syringe needle (2) hypomere is made for elastic plastic material, syringe (1) inwall offers the rib (17) of vertically leading spaced apart, and piston rod (35) leans out from the hollow syringe (1) of lower open mouth.

3, according to claim 1 or 2 described a kind of safety injectors, it is characterized in that: there is the annular snap rib (26) of an evagination in needle holder (22) stage casing of syringe needle (2), annular snap rib (26) and syringe needle sleeve (12) endoporus annular groove (120) be inlay card mutually, the pit (27) of syringe needle (2) hypomere be by the logical groove (25) that slits along needle holder (22) overall diameter, along slot (25) center outside long (271) and (272) formation of slitting of the taper of two recessed serial connections.

4, according to the described a kind of safety injector of claim 3, it is characterized in that: the taper cards of two serial connections slit has angle of deflection between the axial line (200) of the centrage (270) of (271) and (272) and needle holder (22) body, is a taper dop (301) with eccentric plug (302) top of open-minded (271) and (272) the mutually movable plug-in card of taper card.

5, according to the described a kind of safety injector of claim 4, it is characterized in that: the conical bottom periphery of the taper card open-minded (271) and (272) that two strings slit is skewed, and there is a chamfering (231) the foot gap porch of pit (27).

6, according to claim 1 or 2 described a kind of safety injectors, it is characterized in that: the eccentric position of the eccentric pit (32) on piston (31) top of liquid extruding device (3) is identical with the eccentric position of syringe needle sleeve (12) and plug together mutually with the afterbody of needle holder (22), and eccentric inserted link head (302) top that is positioned at eccentric pit (32) center is the dop (301) of a taper.

7, according to claim 1 or 2 described a kind of safety injectors, it is characterized in that: piston rod (35) is the cross body of rod, there is the protruding dish of a push-and-pull (37) lower end of the body of rod, the upper flange (305) of piston rod (35) is mounted in together mutually with piston (31), the cylindrical of piston (31) has an annular groove (311), and a position limiting convex ring (16) is arranged at the open syringe of infra (1) endoporus bottom.

8, according to claim 1 or 2 described a kind of safety injectors, it is characterized in that; There is the handle (14) of an evagination at the lower open mouth place of columniform syringe (1), triangle or the oval plate body of the protruding dish of push-and-pull (37) of piston rod (35) lower end for there being one to put plane (371), the eccentric syringe needle sleeve (12) that the roof (151) of syringe (1) is located epirelief is a tubular, at the changeover portion (122) that syringe needle sleeve (12) and syringe inner chamber (10) perforation place have a diameter to increase, the opening position of pit (27) has chamfering (231).

9, according to claim 1 or 2 described a kind of safety injectors, it is characterized in that: with eccentric syringe needle sleeve (12) mutually sleeve be a hollow straw (121), hollow straw (121) is to insert separately not in syringe needle sleeve (12) or join slotting with syringe needle (2).