Cannula assembly and medical system employing a known carbon dioxide gas concentration

• US 20050092322A1
• Filed: 11/05/2003
• Published: 05/05/2005
• Est. Priority Date: 11/05/2003
• Status: Abandoned Application

• Current Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Original Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Inventors: Collins, William L. Jr.
• Application Number:
  US10/701,737
• Publication Number:
  US 20050092322A1
• Time in Patent Office: Days
• US Class Current: 128/200.26
• CPC Class Codes: A61M 16/085 Gas sampling
• CPC Class Codes: A61M 2202/048 Anaesthetics see also A61M19/00
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: A61M 5/1723 using feedback of body parameters, e.g. blood-sugar, pressure measurement of body parameters A61B5/00

Abstract

A cannula assembly and a medical system. The cannula assembly includes a cannula, a capnometer, a reservoir, a pathway, and a barrier. The cannula is positionable on the face of a patient. The capnometer measures carbon dioxide gas concentration and is operably connected to the cannula. The reservoir is adapted for containing a known concentration of carbon dioxide gas. The pathway connects carbon dioxide gas in the reservoir with the capnometer. The barrier has a first state preventing gas flow along the pathway and has a second state allowing gas flow along the pathway. The medical system includes the cannula assembly and includes a drug delivery assembly. The drug delivery assembly is adapted for administering a drug to the patient according to a drug delivery schedule based at least in part on the carbon dioxide gas concentration of the exhaled air of the patient as measured by the capnometer.

Claims

1. A cannula assembly comprising:

a) a nasal and/or oral cannula disposable on the face of a patient and having a respiratory gas sampling port;

b) a capnometer which measures carbon dioxide gas concentration and which is operably connected to the respiratory gas sampling port of the cannula;

c) a reservoir adapted for containing a known concentration of carbon dioxide gas;

d) a pathway gaseously connecting carbon dioxide gas in the reservoir with the capnometer; and

e) a barrier having a first state preventing gas flow along the pathway and having a second state allowing gas flow along the pathway.

2. The cannula assembly of claim 1, wherein the pathway includes a conduit.

3. The cannula assembly of claim 2, wherein the conduit gaseously connects the carbon dioxide gas in the reservoir with the cannula proximate the respiratory gas sampling port of the cannula.

4. The cannula assembly of claim 3, wherein the barrier is a valve disposed in the conduit.

5. A method of using the cannula assembly of claim 1 for verifying accurate operation of the capnometer comprising the steps of:

a) operating the barrier to fluidly connect the carbon dioxide gas in the reservoir with the capnometer;

b) measuring the concentration of carbon dioxide gas with the capnometer; and

c) comparing the measured and known concentrations of carbon dioxide gas to determine if the capnometer is operating accurately.

6. The method of claim 5, wherein steps a) through c) are performed with the cannula disposed on the face of the patient during a medical procedure.

7. The method of claim 5, wherein steps a) through c) are performed before the cannula is disposed on the face of the patient.

8. A method of using the cannula assembly of claim 1 for identifying the cannula comprising the steps of:

a) operating the barrier to fluidly connect the carbon dioxide gas in the reservoir with the capnometer;

b) measuring the concentration of carbon dioxide gas with the capnometer; and

c) matching the measured concentration with one of a plurality of different predetermined concentrations including the known concentration, wherein each different predetermined concentration corresponds to a different cannula.

9. The method of claim 8, wherein each different cannula has at least one different cannula parameter than each other different cannula.

10. A medical system comprising:

a) a cannula assembly including;

1) a nasal and/or oral cannula disposable on the face of a patient and having a respiratory gas sampling port;

2) a capnometer which measures carbon dioxide gas concentration and which is operably connected to the respiratory gas sampling port of the cannula;

3) a reservoir adapted for containing a known concentration of carbon dioxide gas;

4) a pathway gaseously connecting carbon dioxide gas in the reservoir with the capnometer; and

5) a barrier having a first state preventing gas flow along the pathway and having a second state allowing gas flow along the pathway; and

b) a drug delivery assembly adapted for administering a drug to the patient according to a drug delivery schedule, wherein the drug delivery schedule is determined by a user and/or a controller and is based at least in part on the carbon dioxide gas concentration of the exhaled air of the patient as measured by the capnometer.

11. The medical system of claim 10, wherein the drug delivery assembly is an intravenous drug delivery assembly.

12. The medical system of claim 11, wherein the drug is a conscious sedation drug.

13. The medical system of claim 10, wherein the drug delivery assembly supports the reservoir, and wherein the controller is disposed in a housing containing the capnometer.

14. A method of using the medical system of claim 10 for verifying accurate operation of the capnometer comprising the steps of:

a) operating the barrier to fluidly connect the carbon dioxide gas in the reservoir with the capnometer;

b) measuring the concentration of carbon dioxide gas with the capnometer; and

c) comparing the measured and known concentrations of carbon dioxide gas to determine if the capnometer is operating accurately.

15. The method of claim 14, wherein steps a) through c) are performed with the cannula disposed on the face of the patient during administration of the drug to the patient.

16. The method of claim 14, wherein steps a) through c) are performed before the cannula is disposed on the face of the patient.

17. A method of using the medical system of claim 10 for identifying the cannula comprising the steps of:

a) operating the barrier to fluidly connect the carbon dioxide gas in the reservoir with the capnometer;

b) measuring the concentration of carbon dioxide gas with the capnometer; and

c) matching the measured concentration with one of a plurality of different predetermined concentrations including the known concentration, wherein each different predetermined concentration corresponds to a different cannula.

18. The method of claim 17, wherein each different cannula has at least one different cannula parameter than each other different cannula.

19. A conscious sedation system comprising:

a) a cannula assembly including;

1) a nasal and/or oral cannula disposable on the face of a patient and having a respiratory gas sampling port;

2) a capnometer which measures carbon dioxide gas concentration and which is operably connected to the respiratory gas sampling port of the cannula;

3) a reservoir containing a known concentration of carbon dioxide gas;

4) a pathway gaseously connecting the carbon dioxide gas in the reservoir with the capnometer; and

5) a barrier having a first state preventing gas flow along the pathway and having a second state allowing gas flow along the pathway; and

b) a drug delivery assembly which administers a conscious sedation drug to the patient according to a drug delivery schedule, wherein the drug delivery schedule is determined by a user and/or a controller and is based at least in part on the carbon dioxide gas concentration of the exhaled air of the patient as measured by the capnometer.

20. The conscious sedation system of claim 19, wherein the drug delivery assembly is an intravenous drug delivery assembly, wherein the drug delivery assembly supports the reservoir, and wherein the controller is disposed in a housing containing the capnometer.