Single use syringe and plunger rod locking device therefor
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61M-005/00
A61M-005/315
출원번호
US-0199412
(2002-07-19)
발명자
/ 주소
Lau,Steven Choon Meng
Chua,Chui Khim
Moh,Yaohan
출원인 / 주소
Becton Dickinson and Company
인용정보
피인용 횟수 :
23인용 특허 :
22
초록▼
A single use syringe assembly is provided as well as a locking element for such an assembly. The single use syringe assembly includes a barrel, a plunger rod assembly and a locking element positioned within the barrel. The locking element includes one or more barbs for engaging the inside surface of
A single use syringe assembly is provided as well as a locking element for such an assembly. The single use syringe assembly includes a barrel, a plunger rod assembly and a locking element positioned within the barrel. The locking element includes one or more barbs for engaging the inside surface of the barrel. The barbs prevent the locking element from moving proximally within the barrel, but allow its distal movement therein with the plunger rod assembly. A spring member may be provided for urging the barbs towards the inside surface of the barrel. The barbs are preferably positioned on the edge portions of opposing legs that form part of the locking element.
대표청구항▼
What is claimed is: 1. A single use syringe assembly comprising: a barrel having an inside surface defining a chamber for retaining fluid, and open proximal end and a distal end having a passageway in communication with said chamber; a plunger rod assembly including an elongate body portion having
What is claimed is: 1. A single use syringe assembly comprising: a barrel having an inside surface defining a chamber for retaining fluid, and open proximal end and a distal end having a passageway in communication with said chamber; a plunger rod assembly including an elongate body portion having a proximal end, a distal end, first and second adjoining portions, said first portion being distal of said second portion and having a smaller diameter than said second portion, a first shoulder separating said first and second portions, and a stop surface at the distal end of said first portion, and a stopper mounted to said elongate body portion proximate said distal end, said stopper being slidably positioned in substantially fluid tight engagement with said inside surface of said barrel, said elongate body portion extending outwardly from said open proximal end of said barrel; and a generally trough-shaped locking element positioned within said barrel, said locking element defining a channel, a distal end and a proximal end, said elongate body portion of said plunger rod assembly extending through said channel; one or more barbs extending from said locking element, said one or more barbs engaging said inside surface of said barrel for substantially preventing said locking element from moving proximally with respect to said barrel but allowing movement of said locking element towards said distal end; wherein said distal end of said locking element is engageable with said stop surface and said proximal end of said locking element is engageable with said first shoulder such that said locking element is movable towards said distal end of said barrel as said plunger rod assembly is advanced, and a spring member attached to said locking element and urging said one or more barbs towards said inside surface of said barrel. 2. A single use syringe assembly as described in claim 1 wherein said locking element includes first and second edges, said one or more barbs extending from said edges, and said spring member being integral with said locking element. 3. A single use syringe assembly as described in claim 2 wherein said locking element includes a base and first and second legs extending from said base, said first and second legs being in substantially opposing relation and having end portions engageable with said elongate body portion of said plunger rod, said spring member comprising a third leg extending from said base between said first and second legs. 4. A single use syringe assembly as described in claim 3 wherein said first and second legs include inner edges adjoining said third leg and outer edges, said outer edges of said first and second legs including one or more barbs. 5. A single use syringe assembly comprising: a barrel having an inside surface defining a chamber for retaining fluid; a plunger rod assembly including an elongate body portion having a proximal end, a distal end, first and second adjoining portions, said first portion being distal of said second portion and having a smaller diameter than said second portion, a first shoulder separating said first and second portions, and a stop surface at the distal end of said first portion, and a stopper mounted to said elongate body portion, said stopper being slidably positioned in substantially fluid tight engagement with said inside surface of said barrel, said elongate body portion extending outwardly from said barrel; a locking element positioned within said barrel, said locking element including a base including first and second opposing walls and a third wail connecting said first and second walls, a first leg extending proximally from said first wall, a second leg extending proximally from said second wall, said first and second legs being in opposing relation, a first barb extending from said first leg and engaging said inside surface of said barrel, a second barb extending from said second leg and engaging said inside surface of said barrel, said first leg including a first end portion engageable with said elongate body portion of said plunger rod assembly, said second leg including a second end portion engageable with said elongate body portion of said plunger rod assembly, said first and second inwardly extending end portion of said first and second legs being engageable with said first shoulder, said locking element being engageable with said stop surface and said first and second barbs being positioned to substantially prevent said locking element from moving proximally in said barrel, but allowing said locking element to move distally within said barrel. 6. A single use syringe as described in claim 5 including means for resiliently urging said first and second barbs towards said inside surface of said barrel. 7. A single use syringe as described in claim 6 wherein said means for resiliently urging including a third leg extending proximally from said third wall of said base, each of said first and second legs includes a substantially flat body having an inner edge substantially adjacent to said third leg and an outer edge, said first and second barbs extending, respectively, from said outer edges of said first and second legs. 8. A single use syringe as described in claim 7 wherein said locking element has a generally trough-shaped configuration. 9. A single use syringe as described in claim 8 wherein said elongate body portion of said plunger rod assembly includes a second shoulder proximal of said first shoulder, said end portions of said first and second legs being engageable with said second shoulder. 10. A single use syringe as described in claim 9 wherein the distance between said first shoulder and said stop surface is substantially the same as the length of said locking element. 11. A single use syringe as described in claim 10 where in said locking element is formed from a substantially flat, integral sheet of metal. 12. A single use syringe as described in claim 5 where in said locking element is formed from a substantially flat, integral sheet of metal. 13. A single use syringe as described in claim 12 including a spring member extending proximally from said base and urging said barbs towards said inside surface of said barrel, wherein each of said first and second legs includes a substantially flat body having inner and outer edges, said first and second barbs extending, respectively, from said outer edges of said first and second legs, said inner edges of said first and second legs being adjacent to said spring member. 14. A single use syringe as described in claim 13 wherein said locking element has a generally trough-shaped configuration. 15. A single use syringe as described in claim 13 where said spring member includes a third leg extending proximally from said third wall of said base, said third leg including a bend therein.
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이 특허에 인용된 특허 (22)
Corsich Csar G. (1462 Juan A. Garca St. Del Viso ; Buenos Aires Province ARX), Hypodermic syringe with a blockable piston capable of preventing its recharge and reuse.
Allison Alan C. (233 Marvilla Cir. Pacifica CA 94044) Jaffe Richard A. (786 Wildwood La. Palo Alto CA 94303), Insertable element for preventing reuse of plastic syringes.
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