US 2003/0199816 A1Published application

Pre-loaded multi-chamber syringe

OwnerScott Ramminginventor

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Abstract

There is provided a pre-loaded multi-chamber syringe including an elongated hollow tube having first and second ends. The first end of the tube receives a needle support and the second end of the tube receives a plunger assembly. A moveable gasket is received between the one end of the plunger assembly and the first end of the tube thereby forming first and second chambers. Each chamber receives a liquid. A hollow needle extends from the needle assembly initially into the first chamber. When the plunger is depressed, the liquid from the first chamber is expelled through the hollow needle and the gasket moves to come in contact with the hollow needle wherein the hollow needle penetrates the gasket and thus extends into the second chamber so that the liquid from the second chamber is then expelled through the hollow needle.

Claims10

Dependent claims

A pre-loaded multi-chambered syringe comprising:

(a) an elongated hollow tubular barrel, said barrel having first and second open ends and having an inner wall;
(b) a needle assembly attached to said first end of said barrel;
(c) a plunger assembly slidably received inside said barrel through said second end of said barrel;
(d) said plunger assembly having a first seal;
(e) said first seal engaging said inner wall in substantially an interference fit;
(f) a second seal engaging said inner wall in a substantially interference fit;
(g) said second seal located inside said barrel between said first seal and said first end of said barrel wherein a first chamber is formed between said second seal and said first end of said barrel, and a second chamber is formed between said second seal and said first seal;
(h) said first chamber being substantially filled with a first material;
said second chamber substantially filled with a liquid, wherein the movement of said first seal toward said first end of said barrel causes said second seal to slide toward said first end of said barrel thereby expelling said first material through said needle assembly;
(i) said second seal together with said inner wall maintaining a substantially liquid impervious seal between said first chamber and said second chamber;
(j) said impervious seal between said first and second chambers being maintained while said second gasket slides towards said first end of said barrel;
(k) said needle assembly adapted to penetrate said second seal so that an amount of liquid in said second chamber can be expelled through said needle assembly after the first material has been expelled.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/124,916Filed 17 Apr 2002
Published: 23 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

A61M 5/284
Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle: comprising means for injection of two or more media, e.g. by mixing
A61M 5/3291
Characterised by features of the needle shaft: shafts with additional lateral openings
A61M 2005/1787
Syringes: syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid
A61M 2005/3123
Details: having air entrapping or venting means, e.g. purging channels in pistons