Safety syringe for mixing two-component medicaments
First Claim
1. A mixing syringe for two-component medicaments comprising:
- (A) a cartridge housing having a first end and a second end, said cartridge housing having a substantially cylindrical cartridge housing bore;
(B) a slidable cartridge disposed in said cartridge housing bore and having a first end, a second end, and a temporary sealing barrier disposed between said first and second ends and separating a cartridge bore of said cartridge into a cylindrical medicament solvent charge chamber and a cylindrical medicament charge chamber,said cartridge housing having means connected thereto, for breaching said temporary sealing barrier,said cartridge being suitable for separately storing a medicament solvent charge and a medicament charge in said medicament solvent charge chamber and said medicament charge chamber, respectively, said charges to be mixed to form a medicament to be expelled from said cartridge;
(C) a piston disposed within said first end of said cartridge and being slidably seated in said cartridge bore;
(D) a retractable needle housing assembly slidable in said cartridge housing;
(E) a retractable injection needle fixedly attached to said needle housing assembly and extending therethrough for injecting mixed medicament; and
(F) a puncturable cartridge end stopper rigidly attached to and sealing said second end of said cartridge;
said means for breaching the temporary sealing barrier between chambers of said slidable cartridge comprising a pushrod having an anchoring end and a puncturing end wherein said anchoring end is connected to said cartridge housing, said pushrod extending from said cartridge housing toward said cartridge puncturable end stopper;
said needle assembly housing having a pushrod aperture for freely guiding said pushrod therethrough so that said puncturing end of said pushrod resides in close proximity to and in alignment with said puncturable cartridge end stopper.
3 Assignments
0 Petitions
Accused Products
Abstract
A disposable two-component safety syringe with retractable injection needle adapted for the separate storage of medicament and medicament solvent and the pre-injection mixing thereof. The cartridge-type syringe is adapted to be used manually or in conjunction with an automatic injection/aspiration device for breaching a temporary seal between chambers for the medicament and medicament solvent immediately prior to injection are also provided. Pre-measured medicament is provided in a form which requires no pre-injection agitation. The cartridge is also provided with an injection needle disposed completely within the cartridge housing for safely and sanitarily withdrawing the injection needle to reside completely within the disposable cartridge after use. In one embodiment of the invention, a pushrod for automatically agitating the mixing components is provided.
368 Citations
13 Claims
-
1. A mixing syringe for two-component medicaments comprising:
-
(A) a cartridge housing having a first end and a second end, said cartridge housing having a substantially cylindrical cartridge housing bore; (B) a slidable cartridge disposed in said cartridge housing bore and having a first end, a second end, and a temporary sealing barrier disposed between said first and second ends and separating a cartridge bore of said cartridge into a cylindrical medicament solvent charge chamber and a cylindrical medicament charge chamber, said cartridge housing having means connected thereto, for breaching said temporary sealing barrier, said cartridge being suitable for separately storing a medicament solvent charge and a medicament charge in said medicament solvent charge chamber and said medicament charge chamber, respectively, said charges to be mixed to form a medicament to be expelled from said cartridge; (C) a piston disposed within said first end of said cartridge and being slidably seated in said cartridge bore; (D) a retractable needle housing assembly slidable in said cartridge housing; (E) a retractable injection needle fixedly attached to said needle housing assembly and extending therethrough for injecting mixed medicament; and (F) a puncturable cartridge end stopper rigidly attached to and sealing said second end of said cartridge; said means for breaching the temporary sealing barrier between chambers of said slidable cartridge comprising a pushrod having an anchoring end and a puncturing end wherein said anchoring end is connected to said cartridge housing, said pushrod extending from said cartridge housing toward said cartridge puncturable end stopper; said needle assembly housing having a pushrod aperture for freely guiding said pushrod therethrough so that said puncturing end of said pushrod resides in close proximity to and in alignment with said puncturable cartridge end stopper. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A mixing syringe for two-component medicaments comprising:
-
(A) a cartridge housing having a first end and a second end, said cartridge housing having a substantially cylindrical cartridge housing bore; (B) a slidable cartridge disposed in said cartridge housing bore and having a first end, a second end, and a temporary sealing barrier disposed between said first and second ends and separating a cartridge bore of said cartridge into a cylindrical medicament solvent charge chamber and a cylindrical medicament charge chamber, said cartridge housing having means connected thereto, for breaching said temporary sealing barrier, said cartridge being suitable for separately storing a medicament solvent charge and a medicament charge in said medicament solvent charge chamber and said medicament charge chamber, respectively, said charges to be mixed to form a medicament to be expelled from said cartridge; (C) a piston disposed within said first end of said cartridge and being slidably seated in said cartridge bore; (D) a needle housing assembly rigidly attached to said cartridge and contained wholly within said cartridge housing; (E) an injection needle which is containable wholly within said cartridge housing, which can be extended to a position in which at least a portion of said needle extends outside of said cartridge housing, said needle being fixedly attached to said needle housing assembly and extending therethrough for injecting mixed medicament; (F) a puncturable end cap, said end cap sealing said second end of said cartridge housing; and (G) means for retracting said needle to reside completely within said cartridge housing after the expulsion of said medicament from said syringe; said means for breaching the temporary sealing barrier between chambers of said slidable cartridge comprising a pushrod having an anchoring end and a puncturing end wherein said anchoring end is connected to said cartridge housing, said pushrod extending from said cartridge housing toward said cartridge puncturable end stopper; said needle assembly housing having a pushrod aperture for freely guiding said pushrod therethrough so that said puncturing end of said pushrod resides in close proximity to and in alignment with said puncturable cartridge end stopper.
-
Specification