Anesthesia gas delivery and monitoring system

• US 10,252,018 B2
• Filed: 04/06/2018
• Issued: 04/09/2019
• Est. Priority Date: 09/06/2016
• Status: Active Grant

• Current Assignee: H Lee Moffitt Cancer Center & Research Institute (State University System of Florida)
• Original Assignee: H Lee Moffitt Cancer Center & Research Institute (State University System of Florida)
• Inventors: Chaudhry, Tariq
• Primary Examiner(s): Woodward, Valerie L
• Application Number:
  US15/946,782
• Publication Number:
  US 20180221617A1
• Time in Patent Office: 368 Days
• CPC Class Codes: A61B 5/082 Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath A61B5/083, A61B5/091 take precedence
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/097 Devices for facilitating collection of breath or for directing breath into or through measuring devices
• CPC Class Codes: A61B 5/4821 Determining level or depth of anaesthesia A61B5/1106 takes precedence
• CPC Class Codes: A61M 16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes stimulating the respiratory movement by mechanical, pneumatic or electrical means, iron lungs combined with gas breathing means A61H31/00
• CPC Class Codes: A61M 16/0493 with means for protecting the tube from damage caused by the patient's teeth, e.g. bite block
• CPC Class Codes: A61M 16/085 Gas sampling
• CPC Class Codes: A61M 16/104 specially adapted for anaesthetics A61M16/18 takes precedence
• CPC Class Codes: A61M 2016/103 the CO2 concentration
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2210/0625 Mouth
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 25/02 Holding devices, e.g. on the body

Abstract

Various implementations include a gas delivery and monitoring apparatus that can be used, for example, to deliver oxygen and monitor exhaled carbon dioxide in a subject while under anesthesia. One advantage of the disclosed apparatus is the ability to deliver oxygen directly to the back of the mouth instead of in front of the face. Another advantage of the disclosed apparatus over existing nasal cannulas is the ability to capture carbon dioxide exhaled from both the nose and mouth.

Claims

1. A gas delivery and monitoring apparatus, comprising

(a) a support member having a channel therewithin extending along a longitudinal axis from a proximal end of the channel to a distal end of the channel;

(b) a bite block affixed to the support member sized to be inserted within a mouth of a subject,

(c) a first elongated conduit defining an exhalation capture flow path extending from an exhalation capture manifold, through the channel from the distal end to the proximal end, and terminating in an outlet port;

(d) a second elongated conduit defining a gas delivery flow path extending from an inlet port, through the channel from the proximal end to the distal end, into the bite block, and terminating in a gas delivery port; and

(e) a bridge connecting the bite block to the support member, the bridge extending away from the support member, wherein the bridge positions the bite block a first minimum distance from the support member such that the support member and the bite block are simultaneously positionable on opposite sides of a cheek of a subject.

2. The apparatus of claim 1, wherein the exhalation capture manifold comprises a first capture inlet and a second capture inlet each fluidly connected to the exhalation capture manifold.

3. The apparatus of claim 2, wherein the first capture inlet and a second capture inlet have perpendicular flow paths.

4. The apparatus of claim 1, wherein the bridge extends away from the support member along a transverse plane perpendicular to the longitudinal axis.

5. The apparatus of claim 1, wherein the first minimum distance is 1 to 3 cm.

6. The apparatus of claim 1, wherein the bridge is deformable to a second minimum distance from the support element.

7. The apparatus of claim 6, wherein the second minimum distance is 1 to 3 cm.

8. The apparatus of claim 6, wherein the bridge provides spring tension to secure the bite block within the mouth of the subject.

9. The apparatus of claim 1, wherein the second elongated conduit extends through the bite block to terminate in the gas delivery port.

10. The apparatus of claim 1, wherein the first elongated conduit comprises a flexible elastomeric material that is not gas-permeable.

11. The apparatus of claim 1, wherein the first elongated conduit is encased in a deformable sheath.

12. The apparatus of claim 1, wherein the second elongated conduit comprises a flexible elastomeric material that is not gas-permeable.

13. The apparatus of claim 1, wherein the inlet port is fluidly-connectable to a source of pressurized oxygen.

14. The apparatus of claim 1, wherein at least a portion of each of the support member, bite block, and bridge are integrally formed.

15. The apparatus of claim 1, wherein the support member, bite block, and bridge are mechanically connected.

16. The apparatus of claim 1, wherein a distance between the length between the distal end of the channel and the exhalation capture manifold is about 4 to 8 cm.

17. The apparatus of claim 1, wherein the first elongated conduit has an inner diameter of about 2 to 4 mm.

18. The apparatus of claim 1, wherein the second elongated conduit has an inner diameter of about 2 to 8 mm.

19. The apparatus of claim 1, wherein the first elongated conduit extends into the bite block.