Impedance sensing device and catheter system
First Claim
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1. A method of locating a collection catheter within a coronary sinus, the method comprising the steps of:
- a) providing a sensing device at a distal end of the collection catheter, the sensing device including at least a first pair of electrodes;
b) positioning a distal end of the collection catheter within the coronary sinus at a first position;
c) monitoring the impedance measured by the first pair of electrodes to detect the presence of a medium flowing into the coronary sinus;
d) determining by the impedance measurements from which particular vein the medium is flowing; and
e) moving the collection catheter to a second position such that an opening at the distal end of the collection catheter is located downstream of the antegrade flow from the particular vein.
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Abstract
A sensing system including a collection catheter and a sensing device. The sensing system can be used in determining an optimal location of a collection catheter for the removal of a medium from coronary circulation. The sensing system can also be used in determining the optimal time for the collection of blood containing a medium. The sensing system can further be used to maintain a baseline flow rate through at least a portion of the coronary circulation system during a medical procedure.
211 Citations
33 Claims
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1. A method of locating a collection catheter within a coronary sinus, the method comprising the steps of:
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a) providing a sensing device at a distal end of the collection catheter, the sensing device including at least a first pair of electrodes; b) positioning a distal end of the collection catheter within the coronary sinus at a first position; c) monitoring the impedance measured by the first pair of electrodes to detect the presence of a medium flowing into the coronary sinus; d) determining by the impedance measurements from which particular vein the medium is flowing; and e) moving the collection catheter to a second position such that an opening at the distal end of the collection catheter is located downstream of the antegrade flow from the particular vein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An impedance sensing system, comprising:
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a) an elongated collection tube having a distal opening, the elongated collection tube defining a lumen; b) a vacuum in fluid communication with the collection tube; and c) an impedance sensing device sized for receipt within the lumen of the elongated collection tube, the impedance sensing device being movable between an extended position and a retracted position relative to the collection tube, the impedance sensing device including a plurality of electrodes positionable at a spaced distance from the distal opening of the elongated collection tube and external to the collection tube. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of identifying from which particular vein contrast media will flow, prior to injecting contrast media into a coronary artery, the method comprising the steps of:
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a) providing a sensing system including a collection catheter and a sensing device; b) positioning the sensing system such that a distal end of the collection catheter and a first pair of electrodes of the sensing device are located within the coronary sinus; c) injecting a non-toxic detection agent into a coronary artery; d) monitoring the impedance measured by the first pair of electrodes to detect the presence of the detection agent flowing into the coronary sinus; e) determining by the impedance measurements from which particular vein the detection agent is flowing; and f) adjusting the positioning of the collection catheter such that a distal opening of the collection catheter is located downstream of the antegrade flow from the particular vein. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method of removing a medium from a coronary sinus, the method comprising the steps of:
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a) providing an impedance sensing device including at least one pair of electrodes, the impedance sensing device being located at a distal end of a collection catheter; b) positioning the distal end of the collection catheter within the coronary sinus; c) utilizing measured values of impedance from the at least one pair of electrodes to calculate the level of medium in the flow through the coronary sinus; d) activating operation of the collection catheter to remove the medium from the coronary sinus when the level of medium in the flow is calculated at a first predetermined level. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. An impedance sensing system, comprising:
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a) an elongated collection tube having a proximal end and a distal end, the elongated collection tube defining a collection lumen in fluid communication with an opening located at the distal end of the collection tube; b) a sensing device received within the collection lumen of the collection tube, the sensing device being movable between an extended position and a retracted position relative to the collection tube, the sensing device including a plurality of electrodes, each electrode of the plurality of electrodes being aligned with one another and spaced a distance of about 2 millimeters to 5 millimeters from one another.
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33. An impedance sensing system, comprising:
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a) an elongated collection tube having a proximal end and a distal end, the elongated collection tube defining a collection lumen in fluid communication with an opening located at the distal end of the collection tube; b) a plurality of electrodes carried within the collection lumen of the collection tube, the electrodes being located outside of the patient'"'"'s body during operation of the sensing system, the plurality of electrodes including at least two electrodes aligned with one another and spaced a distance of about 2 millimeters to 5 millimeters from one another.
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Specification