Lung protection electrocautery
First Claim
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1. A method of providing a lung protection function in an electrocautery system, the said method comprising the steps of:
- converting a patient airway pressure signal in a ventilator or an anesthesia machine into an electrical signal with a pressure transducer placed inside the patient endotracheal tubing system or in an inspiratory limb or expiratory limb internal to the ventilator or the anesthesia machine; and
generating an auto-correlation function of data from the converted electrical airway pressure signal for a selected portion spanning at least one and half of a respiration period/cycle iteratively and dynamically; and
determining maximum and minimum values of the electrical airway pressure signal from an iteratively and dynamically updated duration that is a function of the determined airway pressure signal period/cycle; and
calculating a threshold from the determined maximum and minimum values and comparing the threshold with actual live patient electrical airway pressure signal, activating/inactivating a bovie accordingly in real-time.
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Abstract
The present invention reliably provides a lung protection function for an electrocautery device by unitizing an automatic bovie activation/inactivation unit. The lung protection unit utilizes a threshold calculated from the maximum and minimum airway pressure signal in a ventilator or an anesthesia machine to inactivate the bovie before the maximal lung expansion reaches the bovie during a thoracic surgery. Bovie is activated again as soon as the lung expansion level decreases to below the threshold level. This device is an attached optional unit or can be built into a standard electrocautery equipment.
3 Citations
20 Claims
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1. A method of providing a lung protection function in an electrocautery system, the said method comprising the steps of:
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converting a patient airway pressure signal in a ventilator or an anesthesia machine into an electrical signal with a pressure transducer placed inside the patient endotracheal tubing system or in an inspiratory limb or expiratory limb internal to the ventilator or the anesthesia machine; and generating an auto-correlation function of data from the converted electrical airway pressure signal for a selected portion spanning at least one and half of a respiration period/cycle iteratively and dynamically; and determining maximum and minimum values of the electrical airway pressure signal from an iteratively and dynamically updated duration that is a function of the determined airway pressure signal period/cycle; and calculating a threshold from the determined maximum and minimum values and comparing the threshold with actual live patient electrical airway pressure signal, activating/inactivating a bovie accordingly in real-time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Apparatus for providing a lung protection function in an electrocautery, the said apparatus comprising:
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means to obtain a airway pressure in patient endotracheal tubing system or in an inspiratory limb or expiratory limb internal to a ventilator or an anesthesia machine; and means to digitize the electrical airway pressure signal into digital data; means to perform computation, such as a programmable computer or a microprocessor; and means to perform large scale digital signal processing, such as a digital signal processing chip.
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20. Apparatus for providing a lung protection function in an electrocautery, the said apparatus comprising:
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external buttons to select continuous or discrete protection control levels; and an external button to perform function of up 10% lung protection;
an external button to perform function of up 25% lung protection;
an external button to shut down lung protection function only; andcomputer means connected to receive data from an electrical airway pressure signal determining means.
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Specification