Method and system to determine correct tube placement during resuscitation
First Claim
1. Method for controlling insertion of a tracheal tube in a patient comprising the steps of:
- positioning at least two electrodes on the patient'"'"'s chest, said electrodes being coupled to a measuring instrument for measuring the impedance between the electrodes,measuring an impedance variation while ventilating the patient'"'"'s lungs without the tube inserted in the patient, and generating and storing a first data set representing the impedance variation without intubation Zm,inserting the tube into the trachea of the patient,measuring an impedance variation while ventilating the patient'"'"'s lungs with the tube inserted therein and generating a second data set representing the impedance variation with intubation Zt, andevaluating the first (Zm) and second (Zt) data sets representing the change in impedance variation with and without the tube inserted, and based on this evaluation generating a signal being indicative of the difference between the sets.
1 Assignment
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Accused Products
Abstract
System and method for controlling insertion of a tracheal tube in a patient, comprising at least two electrodes adapted to be coupled to the patients chest for providing impedance measurements, a measuring instrument for performing the impedance measurement, said instrument also being provided with storage means for storing a first data set representing chosen characteristics of the impedance change during a first measurement, and evaluation means for comparing the first data set with a second data set representing the characteristics of a second impedance measurement, for evaluating the difference between said measurements and providing an evaluation signal, said first and second data sets representing impedance variations measured during lung inflation with and without an inserted tracheal tube.
15 Citations
20 Claims
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1. Method for controlling insertion of a tracheal tube in a patient comprising the steps of:
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positioning at least two electrodes on the patient'"'"'s chest, said electrodes being coupled to a measuring instrument for measuring the impedance between the electrodes, measuring an impedance variation while ventilating the patient'"'"'s lungs without the tube inserted in the patient, and generating and storing a first data set representing the impedance variation without intubation Zm, inserting the tube into the trachea of the patient, measuring an impedance variation while ventilating the patient'"'"'s lungs with the tube inserted therein and generating a second data set representing the impedance variation with intubation Zt, and evaluating the first (Zm) and second (Zt) data sets representing the change in impedance variation with and without the tube inserted, and based on this evaluation generating a signal being indicative of the difference between the sets. - View Dependent Claims (2, 3, 4, 5, 14)
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6. System for controlling insertion of a tracheal tube in a patient, comprising:
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at least two electrodes adapted to be coupled to the patient'"'"'s chest for providing impedance measurements, a measuring instrument for performing impedance measurements, said instrument also being provided with storage means for storing first and second data sets each representing an impedance variation determined from the impedance measurements, wherein the first data set represents an impedance variation Zm and the second data set represents an impedance variation Zt, and the measuring instrument measures (1) the impedance variation Zm occurring while the patient'"'"'s lungs are ventilated without the tube inserted in the patient'"'"'s lung and generating and storing the first data set representing the impedance variation Zm and (2) the impedance variation Zt occurring while ventilating the patient'"'"'s lungs with the tube inserted therein and generating the second data set representing the impedance variation Zt, and evaluation means for comparing the first data set with the second data set, for determining a difference between said impedance variation Zm and said impedance variation Zt, and providing an evaluation signal based on the difference. - View Dependent Claims (7, 8, 9, 10)
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11. A method for determining an impedance variation associated with an insertion of a tracheal tube in a patient comprising:
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positioning at least two electrodes on a chest of the patient, said electrodes coupled to an electronic device measuring an impedance between the electrodes; measuring with the electronic device a first variation Zm in the impedance while ventilating the patient when the tube is not inserted in the patient, and storing in a memory of the electronic device a first data set representing Zm; inserting the tracheal tube into the trachea of the patient and ventilating the patient; measuring with the electronic device a second variation Zt of the impedance while ventilating the lungs with the tube inserted and storing in the memory a second data set representing Zt, and generating by the electronic device a signal indicative of a comparison of Zm and Zt. - View Dependent Claims (12, 13)
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15. An electronic instrument comprising:
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at least two electrodes adapted to be coupled to a chest of the patient; an impedance measuring system coupled to the electrodes and measuring impedances across the electrodes, while the electrodes are applied to the chest; a memory storing data regarding impedances; a processor receiving signals indicating measured impedances from the impedance measuring system and accessing the memory, the processor is programmed to; generate data regarding impedance variations in the measured impedances and store in memory data representing an impedance variation Zm occurring while the patient is ventilated without the tube inserted in the patient and data representing an impedance variation Zt occurring while the patient is ventilated with the tube inserted in the patient, and compare the data representing the impedance variation Zm to the data representing the impedance variation Zt, and generate a evaluation signal based on the comparison. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification