EP0050035A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oxygen electrodes and medical devices for determining the concentration of a gas in blood both of which employ a membrane of a hydrophilic linear polyether-polyurethane; and hydrophilic linear polyether-polyurethanes for use in such electrodes and devices
Assignee: Smith and Nephew PLC
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Filing: 1981-10-13
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Granted: —
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Expires: 2001-10-13
Abstract
Abstract A device for use in determining blood gas which employs a membrane of material permeable to blood gas to be determined characterised in that the membrane is hydrophilic polyurethane is described.
Inventors
- 👤 William Duncan Potter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 01:20
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1473; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/40; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
30 words
A device for use in determining blood gas which employs a membrane of material permeable to the blood gas to be determined characterised in that the membrane is hydrophilic polyurethane.
Claim 2
Independent Claim
30 words
A device for use in determining blood gas which employs a membrane of material permeable to the blood gas to be determined characterised in that the membrane is hydrophilic polyurethane.
Claim 3
Dependent Claim
37 words
A device as claimed in claim 1 which is an electrochemical sensor adapted for use in contact with the body characterised in that it is coated on a body contacting surface with the membrane of hydrophilic polyurethane.
Claim 4
Dependent Claim
14 words
A device as claimed in claim 2 adapted for contact with.arterial or venous blood.
Claim 5
Independent Claim
21 words
A device as claimed in either of claims 2 or 3 wherein the hydrophilic polyurethane is a hydrophilic linear polyether polyurethane.
Claim 6
Independent Claim
22 words
A device as claimed in any of claims 1 to 4 wherein the hydrophilic polyurethane contains 10 to 40% water when hydrated.
Claim 7
Dependent Claim
18 words
A devices as claimed in claim 5 wherein the hydrophilic polyurethane contains 20 to 30% water when hydrated.
Claim 8
Dependent Claim
41 words
7 . An oxygen electrode mounted at the distal end of a catheter for intravenous use which electrode employs a membrane permeable to oxygen characterised in that the membrane is linear hydrophilic polyurethane which when hdyrated contains 10 to 40% water.
Claim 9
Dependent Claim
41 words
7 . An oxygen electrode mounted at the distal end of a catheter for intravenous use which electrode employs a membrane permeable to oxygen characterised in that the membrane is linear hydrophilic polyurethane which when hdyrated contains 10 to 40% water.
Claim 10
Independent Claim
63 words
A device as claimed in any of claims 2 to 4 wherein the hydrophilic polyurethane is a linear polyether polyurethane wherein the ether units contain poly(ethylene) glycol derivable blocks and poly[(prop or but)ylene glycol] derivable blocks in the mole ratio of 1:2 to 1:10 and ethane diol wherein the mole ratio of ethane diol to polyglycol derivable blocks is from 5:2 to 1:3..
Claim 11
Independent Claim
25 words
A device as claimed in any of claims 1 to 8 wherein the membrane is emplaced by dip coating from a solution of hydrophilic polyurethane.
Claim 12
Independent Claim
21 words
A device as claimed in any of claims 1 to 9 wherein the membrane is from 10 to 25 microns. thick.
Claim 13
Dependent Claim
92 words
A linear hydrophilic polyurethane which consists essentially of 4,4'dicyclohexylmethyl or 4,4'diphenylmethyl residues and alkylene residues are selected from (a) aliphatic diol residues of up to 10 carbon atoms (b) polyethylene glycol) blocks (that is blocks of -CH 2 CH 2 0- residues) and (c) poly[(prop or but)ylene glycol] blocks (that is blocks of CH 2 CH(CH 3 )O- or CH 2 CH 2 CH 2 CH 2 O-residues) wherein the mole ratio of (a):(b) + (c) is from 3:1 to 1:4 and the mole ratio of (b):(c) is from 1:2 to 1:30.
Claim 14
Dependent Claim
92 words
A linear hydrophilic polyurethane which consists essentially of 4,4'dicyclohexylmethyl or 4,4'diphenylmethyl residues and alkylene residues are selected from (a) aliphatic diol residues of up to 10 carbon atoms (b) polyethylene glycol) blocks (that is blocks of -CH 2 CH 2 0- residues) and (c) poly[(prop or but)ylene glycol] blocks (that is blocks of CH 2 CH(CH 3 )O- or CH 2 CH 2 CH 2 CH 2 O-residues) wherein the mole ratio of (a):(b) + (c) is from 3:1 to 1:4 and the mole ratio of (b):(c) is from 1:2 to 1:30.
Claim 15
Dependent Claim
24 words
An oxygen electrode which requires the presence of a protective membrane which is permeable to oxygen characterised in that the membrane is hydrophilic polyurethane.
Claim 16
Dependent Claim
24 words
An oxygen electrode which requires the presence of a protective membrane which is permeable to oxygen characterised in that the membrane is hydrophilic polyurethane.
References Cited (Backward Citations)
No citation records indexed.
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