Patent EP0303757A2 successfully refreshed from Google Patents.
EP0303757A2
Expired / Lapsed
EP
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Dual-thermistor thermodilution catheter
Assignee: B Braun Melsungen AG
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Filing: 1988-02-02
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Granted: —
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Expires: 2008-02-02
Abstract
Abstract A multilumen thermodilution catheter (1) is described wherein a plurality of temperature sensing means are located adjacent the exterior in the catheter body at different distances laterally from the distal end (40) of the catheter (1) and each of said sensors is individually electrically connected to remote temperature measuring means by individual conducting means (6) which communicate predominately through a single lumen (30) in the catheter body and connecting assemblies, communicating with said lumen (30), to the remote temperature measuring means. The present invention provides a multilumen thermodilution catheter which measures the temperature of the bolus as it is introduced into the blood stream so as to avoid inaccuracies that may occur in calculating cardiac output from the use of a bolus whose temperature is measured external of the body.
Inventors
- 👤 Joseph C. Griffin
- 👤 James L. Skaggs
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 10:31
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/028
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
252 words
A multilumen catheter for thermodilution measurement of cardiac output comprising: an elongate multiple lumen catheter body having a distal end and a proximal end; manifold means located at the proximal end of said catheter body for separately connecting the lumens of said catheter body to sources of fluid, sources of gas and instrumentation and measuring means; a plurality of electrical connection means located in one of said lumens communicating with said instrumentation and measuring means and including at least two temperature sensor means; at least one of said sensor means being connected to at least one of said electrical connection means and being located adjacent the exterior surface of the catheter body near the distal end of said catheter body in a manner so as to be capable of sensing the temperature of fluids adjacent said exterior surface; at least one other of said temperature sensor means being connected to at least one other of said electrical connection means and located proximally of said first sensor means by means of passage of said one other second sensor means and attached electrical connection means from said one lumen containing said plurality of electrical connection means into a second of said lumens at a point adjacent said distally located sensor means and said second sensor means being located at a predetermined locus proximal of said distally located sensor means and affixed in said second lumen in a manner so as to be capable of sensing the temperature of fluid present in said second lumen.
Claim 2
Dependent Claim
252 words
A multilumen catheter for thermodilution measurement of cardiac output comprising: an elongate multiple lumen catheter body having a distal end and a proximal end; manifold means located at the proximal end of said catheter body for separately connecting the lumens of said catheter body to sources of fluid, sources of gas and instrumentation and measuring means; a plurality of electrical connection means located in one of said lumens communicating with said instrumentation and measuring means and including at least two temperature sensor means; at least one of said sensor means being connected to at least one of said electrical connection means and being located adjacent the exterior surface of the catheter body near the distal end of said catheter body in a manner so as to be capable of sensing the temperature of fluids adjacent said exterior surface; at least one other of said temperature sensor means being connected to at least one other of said electrical connection means and located proximally of said first sensor means by means of passage of said one other second sensor means and attached electrical connection means from said one lumen containing said plurality of electrical connection means into a second of said lumens at a point adjacent said distally located sensor means and said second sensor means being located at a predetermined locus proximal of said distally located sensor means and affixed in said second lumen in a manner so as to be capable of sensing the temperature of fluid present in said second lumen.
Claim 3
Dependent Claim
58 words
The multiple lumen catheter of claim 1 wherein said temperature sensing means includes a thermistor and electrical connection means connected thereto for electrical attachment to temperature measuring instrumentation, said thermistor of said first sensor means being affixed to said catheter at a point adjacent the exterior surface of the catheter body by means of a biocampatable affixing material.
Claim 4
Dependent Claim
25 words
The multiple lumen catheter of claim 2 wherein said multiple lumen catheter body contains an inflatable balloon adjacent the distal end of said catheter body.
Claim 5
Dependent Claim
118 words
The multiple lumen balloon catheter of claim 3 wherein said at least one other second sensor means is affixed proximal to said distal end of said catheter body in fluid tight relationship with the walls of said second lumen so as to prevent the passage of fluid in said second lumen to any portion of said second lumen distal to the point of affixation and said second lumen communicates with the exterior of said catheter body at a point proximal to said point of affixation whereby fluids infused through said second lumen distally of said catheter body will pass to the exterior of said catheter body at a locus adjacent to the thermistor of said second sensor means.
Claim 6
Dependent Claim
19 words
The multiple lumen balloon catheter of claim 4 wherein said multiple lumen catheter body contains at least three lumens.
Claim 7
Dependent Claim
17 words
The multiple lumen balloon catheter of claim 4 wherein said multiple lumen catheter body contains five lumens.
References Cited (Backward Citations)
No citation records indexed.
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