DETECTING ACCESS DISCONNECT USING NEEDLE SLEEVE
First Claim
1. A method of detecting a needle disconnection, the method comprising:
- providing a needle having a mount with a sensor and a sleeve with a metallic target, the sensor configured for detecting the metallic target;
placing the needle into an extracorporeal blood processing access site;
urging the sleeve against the mount, thereby placing at least a portion of the metallic target near the sensor;
taking a reading of the sensor after the metallic target is urged against the mount;
monitoring the access site by taking additional readings of the sensor during an extracorporeal blood processing therapy; and
sending a signal if a reading consistent with absence of the target from the sensor is detected, thereby indicating dislodgement of the needle.
2 Assignments
0 Petitions
Accused Products
Abstract
An access needle for extracorporeal therapy is equipped with a mount and a sleeve having a metal or magnetic component at its distal end. The mount includes a sensor for detecting when the distal end is pressed against the mount. The sensor is a hall-effect sensor or a proximity sensor. When therapy is begun, the sleeve is rolled up and urged against the mount, exposing the needle for use with the patient. While the sleeve, and the piece of metal or magnet, remains in contact with the sensor, the needle has not been dislodged and therapy may continue. If the needle is dislodged, the sleeve pushes away from mount, moving the metal or magnet away from the sensor. The sensor notes the dislodgement and sends a signal to alert the patient or a caregiver.
123 Citations
19 Claims
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1. A method of detecting a needle disconnection, the method comprising:
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providing a needle having a mount with a sensor and a sleeve with a metallic target, the sensor configured for detecting the metallic target; placing the needle into an extracorporeal blood processing access site; urging the sleeve against the mount, thereby placing at least a portion of the metallic target near the sensor; taking a reading of the sensor after the metallic target is urged against the mount; monitoring the access site by taking additional readings of the sensor during an extracorporeal blood processing therapy; and sending a signal if a reading consistent with absence of the target from the sensor is detected, thereby indicating dislodgement of the needle. - View Dependent Claims (2, 3, 4)
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5. A method for detecting needle disconnection at an access site, the method comprising:
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providing an access needle with an electroactive sleeve and a sensor on a mount of the access needle, wherein the sensor is configured to detect metal or a magnet on the sleeve; mounting the access needle on the access site of a patient and pressing the sleeve toward the mount; taking a reading of the sensor with the pressed sleeve; monitoring the access site during a therapy procedure by taking additional readings with the sensor; and sending a signal if a reading indicative of needle dislodgement is taken. - View Dependent Claims (6, 7, 8)
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9. A system for detecting needle dislodgement, the system comprising:
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an access needle suitable for mounting near an access site for extracorporeal therapeutic blood processing, the access needle including a mount; a sleeve having an electromagnetic target, the sleeve positioned over the needle and adjacent the mount; a sensor on the mount for detecting the electromagnetic element; and a communications circuit in communication with the sensor, wherein the needle is configured for placing into the access site, the sleeve is configured for pressing against the mount, the sensor is configured for detecting the electromagnetic element, and the communications circuit is configured for sending data indicative of a position of the electromagnetic element with respect to the sensor. - View Dependent Claims (10, 11, 12)
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13. A system for detecting needle dislodgement, the system comprising:
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a needle with a mount suitable for mounting near an access site for an extracorporeal blood therapy; a sleeve having a metallic or magnetic target, the sleeve positioned over the needle and adjacent the mount; a sensor on the mount for detecting the metallic or magnetic target; and a control circuit connected to the sensor, wherein the needle is configured for placing into the access site, the sleeve is configured for pressing against the mount, and the control circuit is configured for taking readings of the sensor indicative of a position of the metallic or magnetic target with respect to the sensor. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification