CN1191101C - Improved externally-fitted safety syringe - Google Patents
Improved externally-fitted safety syringe Download PDFInfo
- Publication number
- CN1191101C CN1191101C CNB011242027A CN01124202A CN1191101C CN 1191101 C CN1191101 C CN 1191101C CN B011242027 A CNB011242027 A CN B011242027A CN 01124202 A CN01124202 A CN 01124202A CN 1191101 C CN1191101 C CN 1191101C
- Authority
- CN
- China
- Prior art keywords
- needle
- pin stem
- piston
- needle guard
- syringe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The present invention relates to an improved type externally-installed safe needle cylinder. In the present invention, a plurality of projected ribs are longitudinally arranged on the wall of a needle sleeve hole on a needle sleeve part at the front end of the needle cylinder; a plurality of projected ribs are correspondingly and longitudinally arranged at the periphery of the needle stem part of a needle instrument. When the needle stem part is buckled on the needle sleeve part and a hollow needle is externally installed and screwed on the needle stem part, because the projected ribs of the needle stem part are clamped with the projected ribs of the needle sleeve part and are not be twisted, the hollow needle can be swimmingly screwed and installed; the adjacent piston end of a piston rod is provided with a ratchet hook part, when the piston rod is installed in the needle cylinder and is longitudinal pulled and backwards moved, because the ratchet hook part clamps and blocks a flange ring behind the needle cylinder, the piston rod and the injected needling instrument coupled on a piston are ensured that the piston rod and the injected needling instrument coupled on the piston can not be pulled out. The present invention has an effect that the present invention can inwards shrink and backwards move the needle instrument in the needle cylinder after injection and cause the needle instrument to automatically deflect and not to forwards extend and prick people.
Description
Technical field
The invention relates to a kind of safety syringe-drum of improved external.
Background technology
The inventor's the TaiWan, China utility model patent in first to file (was checked and approved bulletin on August 1st, 86 No. 84209505, publication number is 312154) name is called " contain the fitted outside entry needle and in contract be the safety syringe-drum of automatic deflection ", its safety syringe-drum is after injection is finished, can contract and move back entry needle and enter in the syringe deflection automatically, no longer stretch out the thorn people.Its major defect is:
When entry needle is installed, the pin stem that screws for preventing is rotated by interlock in the lump, be in the shoulder of syringe, to be provided with a shallow nest and two bead bars, a pair of pin with the cylindrical portion of block pin stem, but when injection totally the time, the medicinal liquid in this shallow nest is compressed by piston because of the end, and forms " a pond stagnant water ", can't be injected in the pin, form the waste of medicinal liquid.
Summary of the invention
At above-mentioned defective, the inventor studies improvement, creates technical scheme of the present invention.
The safety syringe-drum that the purpose of this invention is to provide a kind of improved external, by on the needle guard hole wall of syringe front end needle guard portion, be longitudinally set with the prominent rib of most bars, be longitudinally set with the prominent rib of most bars and place outside the pin stem of corresponding DIYU needle set, fasten this pin stem in needle guard portion, in outside adorn, screw hollow needle in pin stem the time, because of the prominent rib of the prominent rib engaging needle guard portion of pin stem is not reversed, this hollow needle of spinning smoothly; And the adjacent piston end in piston rod is provided with the ratchet hook portion, install piston rod in syringe after, vertical drawing moved back piston rod, because of the ratchet hook portion on the piston rod can be blocked shelves in the bead ring at syringe rear, reach the needle set that can not pull out institute's coupling on piston rod and the piston, after injection finishes can in the shortening tool be retracted in the syringe do not protract again thorn people's purpose of deflection automatically.
The object of the present invention is achieved like this: a kind of safety syringe-drum of improved external comprises that the front end of needle cylinder device is provided with needle guard portion; Needle set is installed on this needle cylinder device, and needle set comprises a hollow needle, a pin stem and a discount portion, and pin stem spiral-lock is in needle guard portion, and hollow needle is adorned outward, is combined in the pin stem; Piston apparatus sleeves in this needle cylinder device, is arranged with the discount portion of a deflection pod and this needle set of buckle on the piston, it is characterized in that: be longitudinally set with the prominent rib of most bar needle guards on the hole wall in the needle guard hole of this needle guard portion; It is to be longitudinally set with outside this pin stem to place that this pin stem is provided with most pin belemnoid ribs, engages the prominent rib of needle guard in this needle guard hole.
This pin stem is provided with packing ring and is located in this pin stem, and block is in the rib end of the prominent rib of this needle guard.This pin stem is provided with flanged disc and is connected with in this pin stem rear end, is fastened in the depression of this needle guard portion.It is curved that the piston rod front end of this piston apparatus is connected with the leading edge of a disk, is provided with at least one ratchet hook portion along the circumferential ring of this disk, is provided with a bead ring in this needle cylinder device trailing edge syringe.This ratchet hook portion is a plate-like ratchet hook portion.
Further specify below in conjunction with the preferred embodiment conjunction with figs..
Description of drawings
Fig. 1 is the cross-sectional schematic of pin stem of the present invention and syringe.
Fig. 2 is that pin of the present invention stem is combined in the cross-sectional schematic on the syringe.
Fig. 3 is the discount portion cross-sectional schematic that the present invention injects piston fastening needle set when finishing.
Fig. 4 is the back sketch map of deflection needle set automatically that contracts in of the present invention.
Fig. 5 is the sketch map that prevents to pull out piston rod of the present invention.
Fig. 6 is a ratchet hook portion sketch map of the present invention.
The specific embodiment
Consult Fig. 1-Fig. 6, the present invention comprises that needle set 2 and piston apparatus 3 sleeve in the needle cylinder device 1.This needle cylinder device 1 comprises: the tube inner 10 of a syringe portion 11 is for the dressing liquid medicine injection, one needle guard portion 12 is located at the front end of this syringe portion 11, be provided with needle guard hole 12 in it, one shoulder 13 is between this syringe portion 11 and needle guard portion 12, one syringe rear flange 14 is located at syringe portion trailing edge, and a bead ring 15 is located on adjacent this rear flange 14 of inner 10 trailing edges of tube.
Be longitudinally set with the more prominent rib 12b of several needle guards on the needle guard hole 12a hole wall of this needle guard portion 12, be arranged with the contiguous syringe shoulder 13 of a flanged disc depression 12c in trailing edge.
This needle set 2 comprises: a hollow needle 21 rear portions are connected with a coupling sheath 21a, are equipped with female thread 21b in it; One pin stem 22 is fastened among the needle guard hole 12a of this needle guard portion, and containing a flanged disc 22a is connected with in pin stem 22 rear ends, to fasten the depression 12c in this needle guard portion, as shown in Figure 2, most pin belemnoid rib 22b are longitudinally set with outside this pin stem 22 and place, and to engage the prominent rib 12b of needle guard in this needle guard hole, are located in this pin stem 22 with a packing ring 22C, block is in the rib end of the prominent rib 12b of this needle guard, with the effect that prevents that medicinal liquid from exosmosing; One coupling bar 22d is connected with in the front end of this pin stem 22, contains at least one pair of lug 22e, when outer dress needle set 2, engages the female thread 21b in this hollow needle coupling sheath 21a; One discount portion 23 is located at the needle set rear end, offers outage 24 in it, communicates with the mesopore 20 of needle set, and injecting liquid drug is gone into human body.
When hollow needle 21 is installed, when rotation coupling sheath 21a, when making its female thread 21b screw lug 22e on this coupling bar 22d, because the prominent rib 22b of pin stem is snapped in the prominent rib 12b of needle guard in the needle guard portion, so pin stem 22 can not changeed by hollow needle coupling sheath 21a interlock, band, that is pin stem 22 can not rotate, and allows hollow needle successfully be combined on the coupling bar 22d of pin stem.
The shallow nest portion that the syringe shoulder of prior art is arranged with " exempted J, thus medicinal liquid can be fully mesopore 20 by needle set be injected among the human body, and can not cause the medicinal liquid delay, remnant is in syringe, so the present invention is better than prior art.
Operating principle of the present invention is summarized as follows:
When injection finished, as shown in Figure 3, the discount portion 23 of the deflection pod 32 buckle needle sets in the piston 31 of piston apparatus 3 buckled in the pod 32 through guiding port 33; When drawing when moving back piston 31, needle set 2 is shunk back into syringe inside 10 in the lump by coupling, deflection shape as shown in Figure 4 (disalignment X), and when releasing forward, needle set 2 is multiple not overhanging by bending, reaches purpose of safety again.
Piston rod 35 front ends of this piston apparatus 3 are connected with a disk 35a; connect a buckle end 34 again; with buckle piston 31; and disk 35a rear is set up in parallel a plate-like ratchet hook portion 35b; or the circumferential ring in disk 35a rear along disk 35a is provided with most ratchet hook portion 35b; as Fig. 8; 5; shown in 6; after piston rod 35 is packed syringe inside 10 into; the curved slide fastener of the leading edge of disk 35a; by the bead ring 15 of syringe trailing edge, but when drawing when moving back piston rod 35, as shown in Figure 5; each ratchet hook portion 35b is that block is in bead ring 15; be not drawn out, so after injection finishes, guarantee that piston 31 couplings have the needle set of injecting 2; can not pull out from the syringe rear; needle set must not protract, and retreating does not have door, guarantees that further the safety of safety syringe-drum of the present invention does not have anxiety.
The structure of relevant ratchet hook portion 35b except that above-mentioned, also has other multiple structure and variations, and is all in spirit of the present invention and the category modification or the change of work appropriateness down, all falls within protection scope of the present invention.
Claims (5)
1, a kind of safety syringe-drum of improved external comprises that the front end of needle cylinder device is provided with needle guard portion; Needle set is installed on this needle cylinder device, and needle set comprises a hollow needle, a pin stem and a discount portion, and pin stem spiral-lock is in needle guard portion, and hollow needle is adorned outward, is combined in the pin stem; Piston apparatus sleeves in this needle cylinder device, is arranged with the discount portion of a deflection pod and this needle set of buckle on the piston, it is characterized in that: be longitudinally set with the prominent rib of most bar needle guards on the hole wall in the needle guard hole of this needle guard portion; It is to be longitudinally set with outside this pin stem to place that this pin stem is provided with most pin belemnoid ribs, engages the prominent rib of needle guard in this needle guard hole.
2, the safety syringe-drum of improved external according to claim 1 is characterized in that: this pin stem is provided with packing ring and is located in this pin stem, and block is in the rib end of the prominent rib of this needle guard.
3, the safety syringe-drum of improved external according to claim 1 is characterized in that: this pin stem is provided with flanged disc and is connected with in this pin stem rear end, is fastened in the depression of this needle guard portion.
4, the safety syringe-drum of improved external according to claim 1, it is characterized in that: it is curved that the piston rod front end of this piston apparatus is connected with the leading edge of a disk, circumferential ring along this disk is provided with at least one ratchet hook portion, is provided with a bead ring in this needle cylinder device trailing edge syringe.
5, the safety syringe-drum of improved external according to claim 1 is characterized in that: this ratchet hook portion is a plate-like ratchet hook portion.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011242027A CN1191101C (en) | 2001-08-13 | 2001-08-13 | Improved externally-fitted safety syringe |
| US09/953,460 US6669666B2 (en) | 2001-08-13 | 2001-09-06 | Safety syringe |
| JP2003520806A JP2004537390A (en) | 2001-08-13 | 2002-08-07 | Safety syringe |
| EP02754165A EP1426068A4 (en) | 2001-08-13 | 2002-08-07 | Safety syringe |
| PCT/CN2002/000547 WO2003015852A1 (en) | 2001-08-13 | 2002-08-07 | Safety syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011242027A CN1191101C (en) | 2001-08-13 | 2001-08-13 | Improved externally-fitted safety syringe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1404885A CN1404885A (en) | 2003-03-26 |
| CN1191101C true CN1191101C (en) | 2005-03-02 |
Family
ID=4665577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011242027A Expired - Fee Related CN1191101C (en) | 2001-08-13 | 2001-08-13 | Improved externally-fitted safety syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1191101C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009105960A1 (en) * | 2008-02-25 | 2009-09-03 | Chou Ling-Kong | Safety self-destruction syringe |
-
2001
- 2001-08-13 CN CNB011242027A patent/CN1191101C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009105960A1 (en) * | 2008-02-25 | 2009-09-03 | Chou Ling-Kong | Safety self-destruction syringe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1404885A (en) | 2003-03-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050302 Termination date: 20090914 |