PATIENT BREATHING CIRCUIT

Abstract

The invention relates to patient breathing circuit for use in anaesthesia or respiratory care, the patient circuit comprising a gas source for creating gas mixture for patient breathing and circulating arrangement for delivering the gas mixture to the patient. The circulating arrangement comprising inspiration (9) and expiration tubes (8) through which gases flow to the patient and from the patient, the inspiration and expiration tubes (8,9) having machine ends and patient ends and the tubes (8,9) being provided with a Y-piece (12) at the patient end of the tubes enabling the flow of gases from the inspiration tube (9) to the patient (1) and from the patient (1) to the expiration tube (8). The Y-piece (12) is provided with a flow measuring sensor (2) having pressure lines (3) connected to the measuring device. The pressure lines (3) are arranged to run inside of an outer wall surface of the flow measuring sensor (2).

Description

BRIEF DESCRIPTION OF DRAWINGS

The invention will now be described in greater detail with reference to the attached drawing in which

FIG. 1 shows an example of the prior art spirometry sensor,

FIG. 2 shows an example of the prior art breathing circuit system using the sensor shown on FIG. 1,

FIG. 3 shows one embodiment of the spirometry sensor arrangement used in the invention,

FIG. 4 shows a machine end of the tube system shown in FIG. 3,

FIG. 5 shows the machine end connection of the system shown in FIGS. 3 and 5.

FIG. 6 shows another embodiment of the spirometry sensor arrangement used in the invention,

FIG. 7 shows a machine end of the tube system shown in FIG. 6, and

FIG. 8 shows the machine end connection of the system shown in FIGS. 6 and 7.

Claims

1. A patient breathing circuit for use in anaesthesia or respiratory care, the patient circuit comprising: a gas source for creating gas mixture for patient breathing and circulating arrangement for delivering the gas mixture to the patient, the circulating arrangement comprising inspiration and expiration tubes through which gases flow to the patient and from the patient, the inspiration and expiration tubes having machine ends and patient ends, the tubes being provided with a Y-piece at the patient end of the tubes enabling the flow of gases from the inspiration tube to the patient and from the patient to the expiration tube, the Y-piece being provided with a flow measuring sensor having pressure lines connected to the measuring device, wherein that the pressure lines are arranged to run inside of an outer wall surface of the flow measuring sensor.

2. A patient breathing circuit according to claim 1, wherein the flow measuring sensor further comprises a gas sampling line connected to a measuring device, the gas sampling line being arranged to run inside of the outer wall surface of the flow measuring sensor.

3. A patient breathing circuit according to claim 1, wherein the flow measuring sensor is integrated with the Y-piece and that the pressure lines are arranged to run also inside of the outer wall surface of the Y-piece.

4. A patient breathing circuit according to claim 3, wherein the flow measuring sensor further comprises a gas sampling line connected to a measuring device, the gas sampling line being arranged to run inside of the outer wall surface of the integrated flow measuring sensor and the Y-piece.

5. A patient breathing circuit according to claim 1, wherein the lines are further arranged to run inside of an outer wall surface of the expiration or inspiration tube.

6. A patient breathing circuit according claim 1, wherein the lines are tubes arranged to run in the gas flow channel of the integrated flow measuring sensor and the Y-piece/the expiration or the inspiration tubes.

7. A patient breathing circuit according to claim 1, wherein the lines are lumina arranged to run in the outer wall material of the integrated flow measuring sensor and the Y-piece/the expiration or inspiration tubes.

8. A patient breathing circuit according to claim 5, wherein the lines are arranged to run inside of the outer wall surface of the expiration tube.

9. A patient breathing circuit according to claim 5, wherein lead-outs of the lines are arranged to the machine end connector piece of the expiration or inspiration tube.