METHOD AND DEVICE FOR DETERMINING CARDIAC OUTPUT WITH CARBON DIOXIDE PARTIAL RE-BREATHING
First Claim
1. A device comprising:
- an oral-nasal face mask;
a ventilator having a first port;
a ventilator circuit in fluid communication with said oral-nasal face mask, said ventilator circuit having an inspiratory limb having a port coupled to said ventilator and an expiratory limb having a port;
a fluid containment structure having a first port in fluid communication with the inspiratory limb of said ventilator circuit and having a second port;
an airflow direction system in fluid communication with the inspiratory and expiratory limbs of said ventilator circuit, said airflow direction system coupled to allow gas to only fill the fluid containment structure at a first point in time and to allow a patient to breathe gas only from the a fluid containment structure; and
a non-invasive cardiac output (NICO) monitor coupled to the ventilator circuit;
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus (10) for determining cardiac output by directing airflow or gas flow (fluid) to a fluid containment structure (12) coupled to an inspiratory limb (16) of a ventilator circuit instead of the patient and enabling the patient to directly inhale fluid from the fluid containment structure and preventing the patient from inhaling through an expiratory limb (18) of the ventilator-circuit. The method and apparatus also prevents exhalation by the patient into the fluid containment structure. The method and apparatus also comprises an aid helps the patient become consistent in their breathing patterns. When the fluid containment structure fills with a volume of fluid, the aid provides an indication that the patient should inhale; when the fluid containment structure empties of fluid, the aid provides a signal that the patient should exhale. Thus, the aid provides feedback to the patient to help the patient control their ventilation pattern.
38 Citations
19 Claims
-
1. A device comprising:
-
an oral-nasal face mask; a ventilator having a first port; a ventilator circuit in fluid communication with said oral-nasal face mask, said ventilator circuit having an inspiratory limb having a port coupled to said ventilator and an expiratory limb having a port; a fluid containment structure having a first port in fluid communication with the inspiratory limb of said ventilator circuit and having a second port; an airflow direction system in fluid communication with the inspiratory and expiratory limbs of said ventilator circuit, said airflow direction system coupled to allow gas to only fill the fluid containment structure at a first point in time and to allow a patient to breathe gas only from the a fluid containment structure; and a non-invasive cardiac output (NICO) monitor coupled to the ventilator circuit; - View Dependent Claims (2, 3, 4)
-
-
5. A method comprising:
-
applying a ventilator circuit to a patient'"'"'s natural airway using an oral-nasal face mask. delivering mechanical ventilation with a specific predetermined tidal volume and ventilatory rate; measuring cardiac output (CO) with a non-invasive cardiac output (NICO) monitor using a NICO technique. - View Dependent Claims (6, 7)
-
-
8. A method comprising:
-
having a patient breath normally through an oral-nasal face mask and a non-invasive cardiac output (NICO) monitor without attachment to a ventilator until their ventilatory pattern is stable; measuring the patient'"'"'s tidal volume, respiratory rate and minute ventilation; computing the average tidal volume and respiratory rate; attaching the ventilator to the NICO monitor and operating the ventilator to provide volume targeted mechanical ventilation to a fluid containment structure; and holding the patient'"'"'s minute volume and carbon dioxide (CO2) elimination constant. - View Dependent Claims (9, 10, 11)
-
-
12. A method comprising:
-
ventilating a fluid containment structure in fluid communication with an inspiratory limb of a ventilator circuit; and having a patient passively inspire a fixed volume of gas only from the fluid containment structure wherein the fluid containment structure prevents ventilator pressure from being applied directly to the patient'"'"'s airway such that a ventilatory pattern is maintained consistent and a cardiac output of the patient is prevented from being altered by the application of positive pressure. - View Dependent Claims (13)
-
-
14. A method for determining cardiac output of a patient, the method comprising:
-
operating an airflow direction system to allow a fluid containment structure to be filled with a substantially predetermined volume of gas; providing an indication that the fluid containment structure is filled with the substantially predetermined volume of gas; and in response to the indication that the fluid containment structure is filled with the substantially predetermined volume of gas, allowing the patient to inhale the volume of gas from the fluid containment structure. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification