Method and apparatus for determining tracheal pressure
First Claim
Patent Images
1. An apparatus for the non-invasive measuring the tracheal pressure in the trachea of a patient during the respiration of said patient, said apparatus comprising:
- an endotracheal tube having an inflatable surgical cuff therearound, an inlet, an outlet, and a bore therethrough, the inflatable surgical cuff engaging a portion of trachea of a patient;
a first pressure sensor for sensing the pressure of a fluid flowing through the endotracheal tube during the respiration of a patient;
a second pressure sensor connected to the inflatable surgical cuff of the endotracheal tube for sensing the pressure therein during the respiration of a patient; and
computing apparatus connected to the first pressure sensor and connected to the second pressure sensor for computing the tracheal pressure in the bore of the endotracheal tube from said first pressure of said fluid flowing through said endotracheal tube during the respiration of a patient and from said second pressure sensor connected to the inflatable surgical cuff of said endotracheal tube sensing said pressure therein during the respiration of a patient.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for using the pressure of the surgical cuff installed surrounding an endotracheal tubes or the flow rate therethrough in the calculation of parameters in lung mechanics.
114 Citations
31 Claims
-
1. An apparatus for the non-invasive measuring the tracheal pressure in the trachea of a patient during the respiration of said patient, said apparatus comprising:
-
an endotracheal tube having an inflatable surgical cuff therearound, an inlet, an outlet, and a bore therethrough, the inflatable surgical cuff engaging a portion of trachea of a patient; a first pressure sensor for sensing the pressure of a fluid flowing through the endotracheal tube during the respiration of a patient; a second pressure sensor connected to the inflatable surgical cuff of the endotracheal tube for sensing the pressure therein during the respiration of a patient; and computing apparatus connected to the first pressure sensor and connected to the second pressure sensor for computing the tracheal pressure in the bore of the endotracheal tube from said first pressure of said fluid flowing through said endotracheal tube during the respiration of a patient and from said second pressure sensor connected to the inflatable surgical cuff of said endotracheal tube sensing said pressure therein during the respiration of a patient. - View Dependent Claims (2, 3, 4)
-
-
5. A method of non-invasively measuring the pressure of the flow of fluid through the trachea of a patient during the respiration thereof, said method comprising the steps of:
-
providing an endotracheal tube having an inflatable surgical cuff therearound, an inlet, an outlet, a bore therethrough; inserting the endotracheal tube into said trachea of a patient; inflating the inflatable portion of the endotracheal tube to engage a portion of said trachea of a patient using a second fluid; measuring the pressure of said flow of said fluid during said respiration of a patient at a location outside a patient; measuring the pressure of the fluid contained within the inflatable surgical cuff of the endotracheal tube after the inflation thereof during said respiration of a patient; and determining said pressure of said fluid in the bore of the endotracheal tube during said respiration of a patient using the pressure of the second fluid in the inflatable portion of the surgical cuff, the pressure of said fluid at a location outside a patient, and the flow rate of said fluid during said respiration of a patient. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method of non-invasively measuring the pressure of fluid in the trachea of a patient during the respiration thereof, said method comprising the steps of:
-
providing an endotracheal tube having an inflatable surgical cuff therearound, an inlet, an outlet, and a predetermined diameter bore therethrough; inserting the endotracheal tube into said trachea of a patient; inflating the inflatable portion of the endotracheal tube to engage a portion of said trachea of a patient using a second fluid; measuring the pressure of the flow of said fluid during said respiration of a patient at a location outside a patient; measuring the pressure of the fluid contained within the inflatable surgical cuff of the endotracheal tube after the inflation thereof during said respiration of a patient; initially determining said pressure of said fluid in the bore of the endotracheal tube during said respiration of a patient using the pressure of the second fluid in the inflatable portion of the surgical cuff, the pressure of said fluid at a location outside a patient, and the flow rate of said fluid during said respiration of a patient; initially determining the pressure loss of the flow of said fluid through the endotracheal tube by subtracting the pressure of said fluid at a location outside a patient from the initially determined pressure of said fluid in the bore of the endotracheal tube; determining the relationship between the initial pressure loss of the flow of said fluid determined for the endotracheal tube and a parameter of the flow of said fluid through the endotracheal tube using the measured flow of said fluid; determining a second pressure loss of the flow of said fluid through the endotracheal tube by calculating a second pressure of said fluid in the bore of the endotracheal tube by subtracting from the pressure of said fluid measured outside a patient the quantity of the measured flow rate of said fluid multiplied by itself and by the relationship between the initial pressure loss determined for the endotracheal tube and a parameter of the flow of said fluid through the endotracheal tube; and calculating a second pressure in the bore of said endotracheal tube using the second pressure loss calculated and the pressure of said fluid outside a patient. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A method of non-invasively measuring the pressure of fluid in the trachea of a patient during the respiration thereof, said method comprising the steps of:
-
providing an endotracheal tube having an inflatable surgical cuff therearound, an inlet, an outlet, and a predetermined diameter bore therethrough; inserting the endotracheal tube into said trachea of a patient; inflating the inflatable portion of the endotracheal tube to engage a portion of said trachea of a patient using a second fluid; measuring the pressure of the flow of said fluid during said respiration of a patient at a location outside a patient; measuring the pressure of the fluid contained within the inflatable surgical cuff of the endotracheal tube after the inflation thereof during said respiration of a patient; initially determining said pressure of said fluid in the bore of the endotracheal tube during said respiration of a patient using the pressure of the second fluid in the inflatable portion of the surgical cuff, the pressure of said fluid at a location outside a patient, and the flow rate of said fluid during said respiration of a patient; initially determining the pressure loss of the flow of said fluid through the endotracheal tube by subtracting the pressure of said fluid at a location outside a patient from the initially determined pressure of said fluid in the bore of the endotracheal tube; determining the relationship between the initial pressure loss of the flow of said fluid determined for the endotracheal tube and a parameter of the flow of said fluid through the endotracheal tube using the measured flow of said fluid; determining a second pressure loss of the flow of said fluid through the endotracheal tube by calculating a second pressure of said fluid in the bore of the endotracheal tube by subtracting from the pressure of said fluid measured outside a patient the quantity of the measured flow rate of said fluid multiplied by itself and by the relationship between the initial pressure loss determined for the endotracheal tube and a parameter of the flow of said fluid through the endotracheal tube; and calculating a second pressure in the bore of said endotracheal tube using the second pressure loss calculated and the pressure of said fluid outside a patient. - View Dependent Claims (30, 31)
-
Specification