Surgical humidification system
AssigneeFisher & Paykel Healthcare Limited
InventorsChristopher Thomas COLQUHOUN, Rory MCKAY, Zainab Ali A ALMADAN, Thomas Heinrich BARNES, Christian Francis FISCHER, Bernard Tsz Lun IP, Eu-Lee TEH, Manu PROSSER, Joseph Patrick Walter STREVENS, Lotte Gertrudis Theodora VAN DEN HEUIJ, Qun SHAO
Life of this patent
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Abstract
Disclosed is a surgical humidification system, comprising: a humidifier configured to heat and humidify a gases flow to be provided to a surgical cavity to a desired dew point, and a flow generator configured to provide the gases flow at a desired flow rate.
Claims136
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity at a desired flow rate, wherein the desired flow rate is a flow rate of about 3 litres/minute to about 120 litres/minute,
- a humidifier configured to humidify the gases flow to be provided to the surgical cavity, and
- wherein the humidifier is configured to humidify the gases flow to a desired dew point of about 35 degrees Celsius to about 43 degrees Celsius, or about 40 degrees Celsius.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity at a desired flow rate, wherein the desired flow rate is a flow rate of about 45 litres/minute to about 65 litres/minute,
- a humidifier configured to humidify the gases flow to be provided to the surgical cavity, and
- wherein the humidifier is configured to humidify the gases flow to a desired dew point of about 38 degrees Celsius to about 41 degrees Celsius.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity at a desired flow rate, wherein the desired flow rate is a flow rate of about 3 litres/minute to about 120 litres/minute,
- a humidifier configured to heat and humidify the gases flow to be provided to a surgical cavity,
- wherein the humidifier and/or a heater of a patient conduit pneumatically connected to the humidifier, is configured to humidify the gases flow to a desired dew point of about 35 degrees Celsius to about 43 degrees Celsius, or about 40 degrees Celsius, and to heat the gases flow to a desired temperature about equal to the desired dew point, about an offset plus the desired dew point, above the desired dew point, and/or based on the desired dew point.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity at a desired flow rate, wherein the desired flow rate is a flow rate of about 45 litres/minute to about 65 litres/minute,
- a humidifier configured to heat and humidify the gases flow to be provided to a surgical cavity,
- wherein the humidifier and/or a heater of a patient conduit connected to the humidifier is configured to humidify the gases flow to a desired dew point of about 38 degrees Celsius to about 41 degrees Celsius, and to heat the gases flow to a desired temperature of about 38 degrees Celsius to about 43 degrees Celsius, about equal to the desired dew point, about an offset plus the desired dew point, above the desired dew point, and/or based on the desired dew point.
The surgical humidification system of any preceding claim, wherein the desired flow rate is provided as a continuous flow rate.
The surgical humidification system of any preceding claim, wherein the humidifier has a separate heater and a separate humidification unit, wherein the heater is configured to heat the gases and the humidification unit is configured to humidify the gases.
The surgical humidification system of any preceding claim, wherein the dew point is measured at or near an outlet of the humidifier, at or near an end of an outlet of the humidifier, at or near an end of a conduit connected to the humidifier, at or near an inlet of a cannula which is configured to deliver the gases flow to the surgical site, at or near an outlet of a cannula which is configured to deliver the gases flow to the surgical site, or in the surgical cavity.
The surgical humidification system of any preceding claim, wherein the gases flow is provided to the surgical cavity at a temperature at or above the desired dew point.
The surgical humidification system of any preceding claim, wherein the desired dew point is at or about atmospheric pressure, or at or about atmospheric+the pressure of the surgical cavity, or at or about atmospheric+10mm Hg.
The surgical humidification system of any preceding claim, wherein the system is configured to control a dew point of the gases to the desired dew point.
The surgical humidification system of any preceding claim, wherein the desired dew point is a dew point at a location downstream of the humidifier.
The surgical humidification system of any preceding claim, wherein the desired dew point is a dew point at a location:
- a) at or near an inlet or outlet of a patient conduit,
- b) at or near a patient end or a humidifier end of a patient conduit connected to the humidifier,
- c) at or near a beginning of a conduit connected to the humidifier,
- d) at or near an inlet of a cannula which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a cannula which is configured to deliver the gases flow to the surgical site.
- f) In the surgical cavity.
The surgical humidification system of any preceding claim, wherein the desired temperature is at a location:
- a) at or near an inlet or outlet of a patient conduit,
- b) at or near a patient end or a humidifier end of a patient conduit connected to the humidifier,
- c) at or near a beginning of a conduit connected to the humidifier,
- d) at or near an inlet of a cannula which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a cannula which is configured to deliver the gases flow to the surgical site.
- f) In the surgical cavity.
The surgical humidification system of any preceding claim, wherein the gases flow is Carbon Dioxide
The surgical humidification system of any preceding claim, wherein the desired dew point and/or a desired gases temperature, and/or the desired flow rate are scaled based on a composition of the gases flow.
The surgical humidification system of any preceding claim, wherein the surgical cavity is a pneumoperitoneum of the patient.
The surgical humidification system of any preceding claim, wherein the gases flow is diffused as it enters the surgical cavity.
The surgical humidification system of any preceding claim, wherein the flow generator and humidifier are provided in a single housing.
The surgical humidification system of any preceding claim, wherein the flow generator is an insufflator.
The surgical humidification system of any preceding claim, wherein the flow generator is connected to a pressurised source of gases.
The surgical humidification system of any preceding claim, wherein the flow generator comprises a controller, and the humidifier comprises a controller.
The surgical humidification system of any preceding claim, wherein the system comprises an exhaust line, the exhaust line providing a vent pathway from the surgical cavity.
The surgical humidification system of any preceding claim, wherein the system comprises at least one filter, where the filter is located upstream of the flow generator and/or downstream of the humidifier and/or between the flow generator and the humidifier.
The surgical humidification system of any preceding claim, wherein the system comprises at least one temperature sensor, the at least one temperature sensor configured to measure a temperature of the gases flow, wherein the at least one temperature sensor is located in a gases flow path:
- a) at or near an end of an outlet and/or inlet of the humidifier,
- b) at or near an end of a conduit connected to the humidifier,
- c) at or near an end of a conduit connected to a patient interface,
- d) at or near an inlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- f) in the flow generator,
- g) any combination of a)-f).
The surgical humidification system of any preceding claim, wherein the system comprises at least one flow rate sensor, the at least one flow rate sensor configured to measure a flow rate of the gases flow, wherein the at least one flow rate sensor is located in a gases flow path:
- a) at or near an end of an outlet and/or inlet of the humidifier,
- b) at or near an end of a conduit connected to the humidifier,
- c) at or near an end of a conduit connected to a patient interface,
- d) at or near an inlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- f) in the flow generator,
- g) any combination of a)-f).
The surgical humidification system of any preceding claim, wherein the system comprises at least one pressure sensor, the at least pressure sensor configured to measure a pressure of the gases flow, wherein the at least one pressure sensor is located in a gases flow path:
- a) at or near an end of an outlet and/or inlet of the humidifier,
- b) at or near an end of a conduit connected to the humidifier,
- c) at or near an end of a conduit connected to a patient interface,
- d) at or near an inlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- f) in the flow generator,
- g) any combination of a)-f).
The surgical humidification system of any preceding claim, wherein the system comprises at least one humidity sensor, the at least one humidity sensor configured to measure a humidity of the gases flow, wherein the at least one humidity sensor is located in a gases flow path:
- a) at or near an end of an outlet and/or inlet of the humidifier,
- b) at or near an end of a conduit connected to the humidifier,
- c) at or near an end of a conduit connected to a patient interface,
- d) at or near an inlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- e) at or near an outlet of a patient interface which is configured to deliver the gases flow to the surgical site,
- f) in the flow generator,
- g) any combination of a)-f).
The surgical humidification system of any preceding claim, wherein the gases flow is recirculated from the surgical cavity through the humidifier.
The surgical humidification system of any preceding claim, wherein the gases flow is recirculated through a recirculation circuit, the recirculation circuit comprising a humidifier and the flow generator.
The surgical humidification system of any preceding claim, wherein the system comprises a primary flow generator (optionally an insufflator) configured to control the volume and/or pressure of the surgical cavity of the patient, and wherein the flow generator is a secondary flow generator.
The surgical humidification system of any preceding claim, wherein the system comprises a gases recirculation circuit, the gases recirculation circuit comprising a recirculation flow generator as the flow generator, configured to recirculate gases from the surgical cavity of the patient through a humidifier and back to the surgical cavity of the patient.
A surgical humidification system, comprising:
- a gases recirculation circuit, the gases recirculation circuit comprising a recirculation flow generator configured to recirculate gases from a surgical cavity of the patient through a humidifier and back to the surgical cavity of the patient.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity of a patient,
- a humidifier, wherein the humidifier heats and/or humidifies the gases flow,
- wherein the system is configured to control at least one gases parameter of the gases flow to at least one first desired gases parameter if a patient heating criterion is not satisfied, and
- wherein the system is operable to control the at least one gases parameter of the gases flow to at least one second desired gases parameter if a patient heating criterion is satisfied.
A method of transferring heat to a patient undergoing a surgical procedure to protect a patient from unintended perioperative hypothermia, the method comprising:
- conditioning a gases flow, wherein conditioning the gases flow comprises humidifying the gases flow to a dew point higher than the patient's core body temperature and heating the gases flow to a temperature at or above the dew point, and
- delivering the gases flow to a surgical cavity of a patient.
A method of transferring heat to a patient to protect a patient from unintended surgery-related hypothermia, the method comprising:
- conditioning a gases flow, wherein conditioning the gases flow comprises humidifying the gases flow to a dew point higher than the patient's core body temperature and heating the gases flow to a temperature at or above the dew point, and
- delivering the gases flow to a conduit.
A method of conditioning a gas flow, the method comprising:
- humidifying the gases flow to a dew point wherein the dew point is about 35 degrees Celsius to about 41 degrees Celsius, or about 38 degrees Celsius to about 41 degrees Celsius, and heating the gases flow to a temperature at or above the dew point.
A composition comprising carbon dioxide having a dew point of about 35 degrees Celsius to about 41 degrees Celsius, or about 38 degrees Celsius to about 43 degrees Celsius and at a temperature of about 38 degrees Celsius to about 41 degrees, an offset plus the dew point, or above the dew point, for use in a method of transferring heat to a patient undergoing a surgical procedure to protect a patient from unintended perioperative hypothermia, the method comprising delivering the composition to the surgical cavity of a patient.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity,
- a humidifier configured to humidify the gases flow to be provided to the surgical cavity,
- wherein the gases flow is provided at a flow rate and humidity such that condensation of water vapour in the surgical cavity heats the patient during a surgical procedure.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity to a desired flow rate,
- a humidifier, wherein the humidifier heats and humidifies the gases to a desired dew point,
- wherein the system is configured to transfer energy to the patient, wherein the energy is provided by at least condensation of water vapour on tissue of the patient within the surgical cavity, wherein the energy transferred to the patient is based on at least:
- the desired flow rate and the desired dew point.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity,
- a humidifier configured to humidify the gases flow to be provided to the surgical cavity,
- a gases recirculation circuit, the gases recirculation circuit comprising a recirculation flow generator configured to recirculate gases from the surgical cavity of the patient through a humidifier and back to the surgical cavity of the patient,
- wherein the gases flow is provided at a flow rate, humidity and/or temperature so as to reach or maintain normothermia for a patient.
A surgical humidification system, comprising:
- a flow generator configured to control a gases flow to be provided to a surgical cavity to a desired flow rate,
- a humidifier, wherein the humidifier heats and humidifies the gases to a desired dew point,
- wherein the system is configured to transfer energy to the patient, wherein the energy is provided by at least condensation of water vapour on tissue of the patient within the surgical cavity, wherein the energy transferred to the patient is based on at least:
- the desired flow rate and the desired dew point.
A method of providing a flow of gases to a surgical cavity, the method comprising:
- monitoring a patient temperature,
- conditioning the flow of gases according to one or more operational parameters, wherein the one or more operational parameters comprise at least the dew point of the flow of gases, wherein the dew point of the flow of gases is above the monitored patient temperature, and
- delivering the gases flow to a surgical cavity.
Dependencies are inferred from the claim text.