Apparatus for measuring properties of gases supplied to a patient
DC CAFCFirst Claim
Patent Images
1. An apparatus for measuring properties of gases being supplied to a patient comprising:
- a gases supply,at least one delivery conduit including a heater wire for heating said conduit, said conduit having a first end nearest said gases supply and a second end furthest from said gases supply,wherein said heater wire is located within, around or throughout said conduit, said heater wire extending longitudinally along said conduit from at or near said first end of said conduit to at or near said second end of said conduit, and said heater wire being utilised in an electrical circuit to determine said properties of said gases, said electrical circuit having a first portion and a second portion, said first portion of said electrical circuit being located at or near said first end of said conduit and said second portion of said electrical circuit being located at or near said second end of said conduit, said second portion of said electrical circuit being in electrical communication with said first portion of said electrical circuit through said heater wire such that said first portion and said second portion of said electrical circuit through said heater wire canfeedback to a controller when said properties of said gases vary.
1 Assignment
Litigations
1 Petition
Accused Products
Abstract
The gases temperature supplied to a patient when the patient is undergoing treatment such as oxygen therapy or positive pressure treatment for conditions such as Obstructive Sleep Apnea (OSA) or Chronic Obstructive Pulmonary Disease (COPD) is often measured for safety and to enable controlling of the humidity delivered to the patient. The invention disclosed is related to measurement of properties, particularly temperature (thermister 23), of gases flowing through a heated tube (3), supplying gases to a patient, which utilizes the heating wire (21, 28) within the tube.
87 Citations
30 Claims
-
1. An apparatus for measuring properties of gases being supplied to a patient comprising:
-
a gases supply, at least one delivery conduit including a heater wire for heating said conduit, said conduit having a first end nearest said gases supply and a second end furthest from said gases supply, wherein said heater wire is located within, around or throughout said conduit, said heater wire extending longitudinally along said conduit from at or near said first end of said conduit to at or near said second end of said conduit, and said heater wire being utilised in an electrical circuit to determine said properties of said gases, said electrical circuit having a first portion and a second portion, said first portion of said electrical circuit being located at or near said first end of said conduit and said second portion of said electrical circuit being located at or near said second end of said conduit, said second portion of said electrical circuit being in electrical communication with said first portion of said electrical circuit through said heater wire such that said first portion and said second portion of said electrical circuit through said heater wire can feedback to a controller when said properties of said gases vary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 26, 27, 28, 29, 30)
-
- 16. An apparatus for measuring a property of gases being supplied to a patient, the apparatus comprising a conduit having a proximal end and a distal end, the proximal end adapted to connect to a source of breathing gases and a distal end adapted to connect to a patient interface, the conduit comprising a wall defining a lumen, a heating wire extending from a proximal portion of the conduit to a distal portion of the conduit, a gases property sensor being positioned at the distal portion of the conduit, the gases property sensor being connected in series with the heating wire, and the gases property sensor being connected in parallel with a diode such that current flow in one direction can be used for generating heat in the heating wire and current flow in an opposite direction can be used for measuring the property of the breathing gases.
-
21. An apparatus for measuring properties of gases being supplied to a patient comprising:
-
a gases supply, at least one delivery conduit including a heater wire for heating said conduit, said heater wire being located within, around or throughout said conduit and being utilised in an electrical circuit to determine said properties of said gases, said electrical circuit including a sensing means with known properties at ambient temperature such that said sensing means can be matched with said at least one delivery conduit, and said electrical circuit providing feedback to a controller when said properties of said gases vary. - View Dependent Claims (22)
-
-
23. An apparatus for measuring properties of gases being supplied to a patient comprising:
-
a gases supply, at least one delivery conduit including a heater wire for heating said conduit, said heater wire being located within, around or throughout said conduit and being utilised in an electrical circuit to determine said properties of said gases, said electrical circuit including at least one gas properties measuring means in series with said heater wire, said at least one gas properties measuring circuit comprising a temperature measuring circuit, said temperature measuring circuit including a thermistor and diode in parallel and a reference resistor, and said electrical circuit providing feedback to a controller when said properties of said gases vary. - View Dependent Claims (24)
-
-
25. An apparatus for measuring properties of gases being supplied to a patient comprising:
-
a gases supply, at least one delivery conduit including a heater wire for heating said conduit, said heater wire being located within, around or throughout said conduit and utilised in an electrical circuit that includes a gases property measuring means that includes at least one of a sensor, a band bass filter, or a thermistor and at least one reference resistor to determine said properties of said gases, said at least one of a sensor, band pass filter or thermistor are located at the end of said delivery conduit near to said patient and said at least one reference resistor and at least one band pass filter is included in said gases supply means and said electrical circuit providing feedback to a controller when said properties of said gases vary.
-
Specification