Syringe with dose metering device

Details Syringe with dose metering device Syringe with dose metering device

1989-04-18

1992-04-14

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604157, 604211, 604224, 604232, A61M 500

Patent

active

051043807

ABSTRACT:
A generally pen-like syringe incorporates a dose metering device provided by a cap 7 rotatable with respect to a pen body 8 to a position related to the dose of medicament (for example insulin) to be injected. The rotation compresses a coil spring 6, which is prevented from unwinding by cooperating ratchet teeth. When the dose is to be injected, a trigger slide 42 is moved to the left causing the ratchet teeth to come out of engagement. This permits the spring 6 to unwind, thereby rotating a drive sleeve 1, drive gear 3 and a drive plunger 2. The drive plunger 2 is formed with a quick pitch screw thread so that its rotational movement is accompanied by axial movement to cause medicament to be discharged from a cartridge and injected through a needle.

REFERENCES:
patent: 4244366 (1981-01-01), Raines
patent: 4356822 (1982-11-01), Winstead-Hall
patent: 4373526 (1983-02-01), Kling
patent: 4484910 (1984-11-01), Sarnoff et al.
patent: 4592745 (1986-06-01), Rex et al.
patent: 4710178 (1987-12-01), Leonard et al.
patent: 4820287 (1989-04-01), Leonard
patent: 4850973 (1989-07-01), Jordan et al.
patent: 4883472 (1989-11-01), Michel
patent: 4921487 (1990-05-01), Buffet et al.

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