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Apparatus and method for detecting disconnection of an intravascular access device

A technology of connecting to and switching structures, applied in the field of detecting the disconnection of indwelling venous cannula, which can solve problems such as interference, excessive noise of the dielectric property of the tube wall, etc.

Active Publication Date: 2015-08-19
DEKA PROD LLP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when trying to detect changes in conductivity in blood from electrical signals introduced by inductive or capacitive coupling, the dielectric properties of the tube wall can cause excessive noise or interference

Method used

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  • Apparatus and method for detecting disconnection of an intravascular access device
  • Apparatus and method for detecting disconnection of an intravascular access device
  • Apparatus and method for detecting disconnection of an intravascular access device

Examples

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Embodiment Construction

[0029] conduction circuit

[0030] Such as figure 1 The exemplary circuit shown can be used to measure the conductivity or resistance of a subject fluid. In one embodiment, the fluid may be an electrolyte solution or dialysis fluid, and the circuit may ultimately provide a measurement of the conductivity of the fluid to ensure compatibility for intravascular administration. In addition to monitoring the concentration of solutes in the fluid, the circuit can also monitor any interruption in the continuity of the fluid between electrodes connected to the circuit. For example, it can be used to monitor the presence of air bubbles in intravenous fluid cannula, or the presence of contaminating substances. In another embodiment, the fluid may be blood, and a change in measured resistance in the blood flow path (eg, in a catheter) may be used to indicate whether a break has occurred between the blood flow path and the measurement electrodes. For example, the blood flow path may ...

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PUM

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Abstract

An apparatus and method are disclosed for detecting the disconnection of a vascular access device such as a needle, cannula or catheter from a blood vessel or vascular graft segment. A pair of electrodes is placed in direct contact with fluid or blood in fluid communication with the vascular segment. In one embodiment, the electrodes are incorporated into a pair of connectors connecting arterial and venous catheters to arterial and venous tubes leading to and from an extracorporeal blood flow apparatus. Wires leading from the electrodes to a detecting circuit can be incorporated into a pair of double lumen arterial and venous tubes connecting the blood flow apparatus to the blood vessel or vascular graft. The detecting circuit is configured to provide a low-voltage alternating current signal to the electrodes to measure the electrical resistance between the electrodes, minimizing both the duration and amount of current being delivered. Detection of an increase in electrical resistance between the electrodes exceeding a pre-determined threshold value may be used to indicate a possible disconnection of the vascular access device.

Description

[0001] Cross References to Related Applications [0002] This application is a non-provisional application that claims priority to U.S. Provisional Patent Application No. 61 / 256,735, filed October 30, 2009, and entitled Apparatus and Method for Detecting Disconnection of an Intravascular Access Device, filed at This is incorporated by reference in its entirety. Background technique [0003] The present invention generally relates to a system and method for detecting disconnection of an indwelling intravenous line, such as a catheter or needle, or tubing attached thereto. If not detected quickly, the disconnection can lead to rapid blood loss, especially when the blood within the catheter or tubing is under positive pressure. Examples of conditions with positive intravascular pressure include positive pressure associated with arterial or arteriovenous fistulas, or positive pressure associated with an extracorporeal blood pump circuit. In hemodialysis, for example, blood pumps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M1/36G01N27/07
CPCG01N27/07A61M1/3656A61M1/3653G01R27/14A61M1/36225A61M2205/3317A61M1/3655A61M1/3659
Inventor 迈克尔·J·威尔特詹森·M·萨克斯凯文·L·格兰特
Owner DEKA PROD LLP