Self-flowing measuring system
First Claim
1. A probe adapted for insertion into an artery of a patient, comprising an essentially cylindrical elongated body having a proximal part, a distal part, and at least one chamber part at an outer cylindrical surface of the body and covered by a membrane, wherein the probe is provided with a single flow lumen, wherein the chamber part is in fluid connection with the flow lumen, and the flow lumen is operable to transport a spontaneous flow of fluid, continuously obtained from the artery through the membrane into the chamber part, from the distal part of the body to the proximal part of the body for subsequent measurement of the concentration of one or more substances present in the artery, wherein the membrane has a liquid permeability of about 5-50*10−
- 4 cm/(bar*s).
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Accused Products
Abstract
The invention relates to a method and arrangement for continuously measuring substances in a pressurised body fluid. A probe (202) for enabling continuous measurement of the concentration of one or more substances in a pressurized body fluid is provided. The probe is adapted to be inserted into the pressurized body fluid, and comprises an interface and an outlet lumen. Furthermore, the probe is configured so that a continuous and spontaneous fluid flow is established from the body fluid through the interface to the outlet lumen. The fluid flow from the outlet may be analyzed by a sensor.
11 Citations
25 Claims
- 1. A probe adapted for insertion into an artery of a patient, comprising an essentially cylindrical elongated body having a proximal part, a distal part, and at least one chamber part at an outer cylindrical surface of the body and covered by a membrane, wherein the probe is provided with a single flow lumen, wherein the chamber part is in fluid connection with the flow lumen, and the flow lumen is operable to transport a spontaneous flow of fluid, continuously obtained from the artery through the membrane into the chamber part, from the distal part of the body to the proximal part of the body for subsequent measurement of the concentration of one or more substances present in the artery, wherein the membrane has a liquid permeability of about 5-50*10−
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17. A method of manufacturing a probe adapted for insertion into an artery, that ascertains a continuous fluid flow through a membrane contacting arterial blood and is provided with a flow lumen extending from a distal part of the probe to a proximal part of the probe for sampling or sensing of one more compounds in the arterial blood, comprising the steps of:
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a) providing an elongated probe body having an internal flow lumen connected to a chamber part, wherein the chamber part is at an outer cylindrical surface of the body and is coverable with a membrane; b) estimating at least one of the systolic pressure and the diastolic pressure in the artery in a selected body site; c) selecting a membrane which at the estimated arterial pressure provides a spontaneous fluid flow of about 1-50 μ
l/min in the single flow lumen following contact with the arterial blood; andd) attaching the membrane to sealingly cover the probe chamber part. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification