System and apparatus for detecting catheters relative to introducers
An apparatus for detecting relative positioning of medical devices located within a human body, the apparatus comprising an inner elongate member comprising a plurality of electrodes and a first sensor member, where the first sensor member is located a known distance from each of the plurality of electrodes, and an outer elongate member comprising a first sensor, and an outer sensor member located between the first sensor and an inner wall of the outer elongate member, where the inner elongate member is configured to move within the outer elongate member and the first sensor is configured to sense a signal generated by movement of the inner elongate member relative to the outer elongate member, and a position detection module including an electronic control unit configured to detect a position of the first sensor member relative to the first sensor based on the signal.
1 . A system for detecting a relative position of a medical device within a human body, the system comprising:
a catheter including a plurality of electrodes and a sensor member having a sensor member length extending along a sensor member axis, wherein the sensor member axis is oriented to form an angle θ relative to a longitudinal axis of the catheter, wherein the angle θ is greater than 0°;
a sheath including a sensor and a lumen to receive the catheter therethrough, the sensor configured to sense movement of the sensor member relative to the sensor and generate a signal; and
a position detection module including an electronic control unit to determine a co-axial insertion distance of the catheter relative to the sheath based on the signal,
wherein the plurality of electrodes includes a first electrode and a second electrode separated by an electrode separation distance, wherein the sensor member length is greater than the electrode separation distance.
2 . The system of claim 1 , wherein the plurality of electrodes includes one or more ring electrodes having a circular cross-section, the circular cross-section having a center point, wherein the sensor member intersects the center point of the one or more ring electrodes.
3 . The system of claim 1 , wherein the sensor has an annular shape defining an aperture to receive the catheter therethrough.
4 . The system of claim 1 , wherein the sensor member extends under at least a portion of the first electrode and at least a portion of the second electrode.
5 . The system of claim 1 , wherein the plurality of electrodes includes a tip electrode positioned at a distal end of the catheter, wherein the sensor member length spans from the tip electrode to the first electrode.
6 . The system of claim 5 , wherein the sensor member extends under at least a portion of the first electrode, at least a portion of the second electrode, and at least a portion of the tip electrode.
7 . The system of claim 1 , wherein positions of the plurality of electrodes relative to the sensor member are stored in the electronic control unit.
8 . The system of claim 1 , wherein the signal generated by the sensor member has a maximum magnitude when a longitudinal center point of the sensor member passes through the sensor of the sheath.
9 . A system comprising:
a catheter including a plurality of electrodes and a sensor member formed of a magnetically permeable material, wherein the sensor member defines a sensor member axis extending along a sensor member length, wherein the sensor member axis is oriented to form an angle θ relative to a longitudinal axis of the catheter, wherein the angle θ is greater than 0°;
a sheath including a sensor and a lumen to receive the catheter therethrough, the sensor configured to sense movement of the sensor member relative to the sensor and generate a signal; and
a position detection module including an electronic control unit to determine a co-axial insertion distance of the catheter relative to the sheath based on the signal,
wherein the sensor has an annular shape defining an aperture to receive the catheter therethrough,
wherein the plurality of electrodes includes a first ring electrode and a second ring electrode, wherein the sensor member extends under at least a portion of the first ring electrode and the second ring electrode.
10 . The system of claim 9 , wherein the plurality of electrodes includes a tip electrode positioned at a distal end of the catheter, wherein the sensor member extends under at least a portion of the tip electrode.
11 . The system of claim 9 , wherein the sensor is positioned at a distal end of the sheath.
12 . The system of claim 9 , wherein the position detection module determines the co-axial insertion distance of the catheter relative to the sheath based on a voltage sensed by the sensor on the sheath.
13 . The system of claim 12 , wherein positions of the plurality of electrodes relative to the sensor member are stored in the electronic control unit, wherein real-time positions of the plurality of electrodes are determined by the position detection module based on the co-axial insertion distance of the catheter relative to the sheath and the stored positions of the plurality of electrodes relative to the sensor member.