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Catheter with common guide wire and indicator lumen

a catheter and guide wire technology, applied in the field of blood flow measurement, can solve problems such as reducing the accuracy of measurement, and achieve the effects of convenient operation, improved blood flow measurement accuracy in thermodilution measurement, and reduced measurement accuracy

Inactive Publication Date: 2012-06-28
TRANSONIC SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances the accuracy of blood flow measurements in retrograde catheter configurations by minimizing the impact of thermal transfer, providing a more reliable and cost-effective method for determining blood flow rates during interventions.

Problems solved by technology

In this case, inside cooling of the dilution thermal sensor falsely increases the area under the resulting dilution curve and thus decreases the accuracy of the measurement.

Method used

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  • Catheter with common guide wire and indicator lumen
  • Catheter with common guide wire and indicator lumen
  • Catheter with common guide wire and indicator lumen

Examples

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Embodiment Construction

[0040]Referring to FIGS. 1 and 2, the present indicator dilution catheter 10 is shown operably located in an arterio-venous (A-V) shunt 12. The A-V shunt 12 has a blood flow shown by the direction of the arrows, the catheter 10 includes an elongate body 20 having an extravascular portion 22 and an intravascular portion 24. The extravascular portion 22 being that portion or length of the body 20 that is not operably located within the A-V shunt 12 to contact the blood flow in the shunt. The intravascular portion 24 is that portion or length of the body 20 that is operably located within the A-V shunt 12 and contacts the blood flow in the shunt. The body 20 includes a proximal end, a distal end 28, an indicator (injectate) lumen 32, an injection port(s) 34 and a dilution sensor 36 for detecting passage of the injected indicator in the blood flow in the A-V shunt 12. That is, the dilution sensor measures a temperature of the diluted blood flow resulting from introduction of the injecta...

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PUM

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Abstract

A catheter for retrograde orientation in a blood flow is used to determine the blood flow rate by thermodilution measurements. The determination of the blood flow rate accommodates injectate induced thermal influences on a dilution thermal sensor, wherein the thermal influences can occur prior to introduction of the injectate into the blood flow.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a divisional of U.S. patent application Ser. No. 10 / 657,829 filed Sep. 9, 2003, which is a continuation of U.S. patent application Ser. No. 10 / 079,006 filed Feb. 20, 2002, now U.S. Pat. No. 6,623,436.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]This invention was made with government support under Phase I SBIR (Small Business Innovative Research Grant #1 R43 DK55444-01A2 awarded by the National Institutes of Health. The government has certain rights in the invention.BACKGROUND OF THE INVENTIONField of the Invention[0003]The present invention relates to blood flow measurement by thermodilution measurement, and more particularly to compensating for an injectate induced thermal effect on a thermal sensor in a retrograde catheter.[0004]In native A-V fistulae, any stenosis is often located at the arterial portion of the vascular access or A-V shunt. The existence of a stenosis in the vascular ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B5/028
CPCA61B5/6855A61B5/028
Inventor KRIVITSKI, NIKOLAI M.KISLUKHIN, VICTOR V.
Owner TRANSONIC SYST
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