Dual chamber and gear pump assembly for a high pressure delivery system

Patent metadata

Field	Value
Publication number	US-11383025-B2
Application number	US-201916405037-A
Country	US
Kind code	B2
Filing date	May 7, 2019
Priority date	Jul 18, 2008
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A high pressure delivery system for delivering a medicament, comprising a first chamber for storing a supply of the medicament, a gear pump assembly in fluid communication with the first chamber, said gear pump assembly having a dose inlet and a dose discharge, said dose inlet having a larger diameter than said dose discharge to provide a high pressure discharge, and a fluid connection path in fluid communication with the gear pump assembly for delivering the medicament to a high pressure area.

First claim

What is claimed is:

1. A high pressure delivery system for delivering a medicament, comprising:
a first chamber for storing a supply of the medicament;
a gear pump assembly in fluid communication with the first chamber, said gear pump assembly having a dose inlet and a dose discharge, said dose inlet having a larger diameter than said dose discharge to provide a high pressure discharge; and
a fluid connection path in fluid communication with the gear pump assembly for delivering the medicament to a high pressure area; wherein
pockets formed between adjacent teeth of a first gear and adjacent teeth of a second gear of the gear pump assembly each have a volume at a cross section defined when respective teeth of the first gear and the second gear are fully engaged; and
the pockets gradually increase in volume in the defined cross section such that a gradually increasing rate of medicament is delivered during the dose.

2. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
said first chamber comprises a medicament cartridge and said fluid connection path comprises a needle.

3. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
the gear pump assembly includes one or more gear teeth that contact the medicament from the first chamber.

4. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
the pockets are formed in meshing portions between the teeth of the first and the second gears of the gear pump.

5. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
a first pocket formed between adjacent teeth of the first gear and a second pocket formed between adjacent teeth of the second gear primes the high pressure drug delivery system; and
subsequent pockets formed between adjacent teeth of the first and the second gears, respectively, gradually increase in volume.

6. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
a second chamber is in fluid communication with said first chamber.

7. The high pressure delivery system for delivering a medicament according to claim 1 , wherein:
the gear pump assembly provides variable rate control while receiving a consistent input driving the medicament.

8. The high pressure delivery system for delivering a medicament according to claim 7 , wherein:
the consistent input includes a torsion spring.

Assignees

• Becton Dickinson Co

Inventors

• Bates James
• Banik Robert
• Ginsberg Barry

Classifications

• A61M5/31535

  Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose · CPC title

• A61M2005/3152

  including gearings to multiply or attenuate the piston displacing force · CPC title

• F04C2/084

  Toothed wheels · CPC title

• A61M2005/3128

  Incorporating one-way valves, e.g. pressure-relief or non-return valves · CPC title

• A61M5/484

  Regulating injection pressure · CPC title