EP0494042A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid delivery device particularly useful for delivering drugs
Assignee: SI Scientific Innovations Ltd
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Filing: 1991-12-30
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Granted: —
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Expires: 2011-12-30
Abstract
Abstract A delivery device for delivering a liquid containing a drug includes a first diaphragm (8) within a housing (2) defining a first contractible-chamber (C₁) on one side of the diaphragm (8) for holding a supply of the liquid to be delivered, and a second contractible chamber (C₂) on the opposite side of the diaphragm (8) including an electrolytic cell (26) capable of generating a gas according to the electrical current passed through the cell electrolyte (32). The device further includes a second diaphragm (10), a control valve (18), and a spring (24), for compensating the rate of delivery of the liquid for variations in ambient pressure and temperature.
Inventors
- 👤 Joseph Gross
- 👤 Shlomo Zucker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 20:35
CPC Classifications
B; B05; B05B; B05B9/00; B05B9/03; B05B9/04; B05B9/08; B05B9/0805; B05B9/0844; A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/155; A61M5/168; A61M5/16877; A61M5/16881; B05B11/00; B05B11/01; B05B11/02; B05B11/026; B05B11/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
A liquid delivery device including: an outer housing having an outlet for the liquid to be delivered; a displaceable member within the housing defining a first contractible chamber on one side of the displaceable member for holding a supply of the liquid to be delivered, and a second contractible chamber on the opposite side of the displaceable member; and pressure control means for controlling the pressure produced in said second contractible chamber for controlling the displacement of the displaceable member, and thereby the rate of flow of the liquid via said outlet; characterized in that said housing further includes: a second displaceable member defining a third contractible chamber between said housing and said first contractible chamber adjacent to said outlet; said third contractible chamber including compensating means for compensating the rate of flow of the liquid via said outlet in response to changes in temperature and pressure.
Claim 2
Dependent Claim
62 words
The device according to Claim 1, wherein said compensating means comprises: a control valve between said second displaceable member and said housing outlet; and biassing means for biassing said second displaceable member in the direction tending to close said control valve, such as to compensate the rate of flow of the liquid via the outlet for variations in ambient pressure and temperature.
Claim 3
Dependent Claim
50 words
The device according to Claim 1, wherein both of said displaceable members are diaphragms, and said pressure-control means comprises an electrolytic cell having a pair of electrodes separated by an electrolyte capable of generating a gas applied to said second chamber according to the electrical current passing through said electrolyte.
Claim 4
Dependent Claim
26 words
The device according to Claim 3, wherein the cross-sectional area of the second diaphragm is many times that of the outlet side of said control valve.
Claim 5
Dependent Claim
33 words
The device according to Claim 4, wherein said compensating chamber includes a control valve between said outlet and said second chamber, and electrical sensor means for sensing the opening of said control valve.
Claim 6
Dependent Claim
102 words
The device according to Claim 5, wherein said sensor means comprises a valve member and a valve seat both carried by said second diaphragm; said valve seat having a lost-motion connection with respect to said valve member such that the valve member is normally closed with respect to the valve seat, but upon engagement of the second diaphrgam with a fixed part of the housing, the valve member moves with respect to the valve seat to open the valve to said outlet; and electrical means for sensing the engagement of the valve member with respect to said fixed part of the housing.
Claim 7
Dependent Claim
63 words
The device according to Claim 6, wherein said lost-motion connection comprises a stem carried by said second diaphragm and engageable on one side thereof with said fixed part of the housing, said valve member also being carried by said second diaphragm; said stem being displaceable with respect to said second diaphragm and carrying the valve seat on the opposite side of said diaphragm.
Claim 8
Dependent Claim
30 words
The device according to Claim 6, wherein said fixed part of the housing includes a pressure-sensor sensing the pressure applied by said stem against the fixed part of the housing.
Claim 9
Independent Claim
27 words
The device according to any one of Claims 2-8, further including calibrating means for precalibrating the pressure required in said second chamber for opening said control valve.
Claim 10
Dependent Claim
33 words
The device according to Claim 9, wherein said calibrating means comprises a rotatable member rotatably carried by said housing and having an inclined surface engageable with said stem carried by said second diaphragm.
Claim 11
Dependent Claim
57 words
The device according to Claim 9, wherein said calibrating means comprises a leaf spring fixed at its opposite ends to the housing, and a threaded pin threaded through an opening in said housing and engageable with an intermediate portion of the leaf spring to move said intermediate portion towards or away from said opening in the housing.
References Cited (Backward Citations)
No citation records indexed.
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