Implantable infusion pump
First Claim
1. In an infusion pump for implanting within the body of a patient, the pump including an outer housing enclosing a propellant chamber and an elongated inner housing containing a medication, the propellant chamber containing at least 2.5 bar over atmospheric pressure of a propellant gas, a capillary tube of restricted diameter leading out of the inner housing for restricting the medication flow and a means for filling the inner housing with the medication, the improvement comprising the housing containing the medication is elastic, and the propellant is dichlorotetrafluoroethane to cause a minimal flow rate change for the medication to be infused when pressure or temperature in the patient changes.
2 Assignments
0 Petitions
Accused Products
Abstract
An infusion pump with a flexible medication container, a chamber containing a C2 Cl2 F4 propellant gas acting upon the medication container and a capillary tube acting as a choke. The propellant gas chamber accommodates a pressure of 2.5 bar over atmospheric.
74 Citations
4 Claims
- 1. In an infusion pump for implanting within the body of a patient, the pump including an outer housing enclosing a propellant chamber and an elongated inner housing containing a medication, the propellant chamber containing at least 2.5 bar over atmospheric pressure of a propellant gas, a capillary tube of restricted diameter leading out of the inner housing for restricting the medication flow and a means for filling the inner housing with the medication, the improvement comprising the housing containing the medication is elastic, and the propellant is dichlorotetrafluoroethane to cause a minimal flow rate change for the medication to be infused when pressure or temperature in the patient changes.
Specification