Dispensing device for a liquid medicament
First Claim
Patent Images
1. A device for administering a liquid medicament to a patient at a substantially constant rate, said device comprising:
- a housing formed with a generally cylindrical support;
a flexible collapsible annular reservoir containing said medicament and surrounding said support and braced thereagainst, said reservoir having an inwardly contractible wall which is distended when said reservoir is filled with said medicament;
an annular resilient body surrounding said reservoir and in contact therewith in an unstressed state of said body, said body being distended upon filling of said reservoir with said medicament to apply an inward radial force to said wall for pressurizing said medicament in said reservoir; and
a passage formed in said housing and connected to said reservoir while having an outlet adapted to communicate with an internal part of said patient, said passage having a cross section and length and structure controlling outflow of said medicament in relation to the annular force applied to said wall and the contraction of said wall under said force during discharge of said medicament that said discharge is effected with a substantially constant pressure over substantially the entire discharge period.
1 Assignment
0 Petitions
Accused Products
Abstract
A dispensing device for a liquid medicament has a cylindrical support formed on a base which receives an application part fitted into this support and costituting a projection from a cover. An annular reservoir braced against the support is pressed inwardly by a prestressed annular body which can be formed integrally with the reservoir of silicone rubber to drive a liquid medicament through the passage formed in the application part into the body at a constant rate.
-
Citations
19 Claims
-
1. A device for administering a liquid medicament to a patient at a substantially constant rate, said device comprising:
-
a housing formed with a generally cylindrical support; a flexible collapsible annular reservoir containing said medicament and surrounding said support and braced thereagainst, said reservoir having an inwardly contractible wall which is distended when said reservoir is filled with said medicament; an annular resilient body surrounding said reservoir and in contact therewith in an unstressed state of said body, said body being distended upon filling of said reservoir with said medicament to apply an inward radial force to said wall for pressurizing said medicament in said reservoir; and a passage formed in said housing and connected to said reservoir while having an outlet adapted to communicate with an internal part of said patient, said passage having a cross section and length and structure controlling outflow of said medicament in relation to the annular force applied to said wall and the contraction of said wall under said force during discharge of said medicament that said discharge is effected with a substantially constant pressure over substantially the entire discharge period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification