Retreated sensing electrode

• US 4,499,901 A
• Filed: 06/30/1983
• Issued: 02/19/1985
• Est. Priority Date: 06/30/1983
• Status: Expired due to Fees

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: Critikon, Inc.
• Inventors: Chang, Joseph J., Ramsey, Maynard III
• Primary Examiner(s): Kaplan, G. L.
• Assistant Examiner(s): Nguyen, Nam X.
• Application Number:
  US06/509,500
• Time in Patent Office: 600 Days
• Field of Search: 128/635, 128/642, 128/632, 204/415, 204/403, 204/402, 204/1 P, 204/1 Y, 204/416, 422/24
• US Class Current: 600/360
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: A61B 5/6849 in combination with a needle set
• CPC Class Codes: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Abstract

An improved sensing electrode assembly for testing for a constituent in blood is provided. An electrode assembly exhibits a decreased time to reach stable operation by virtue of having the assembly pretreated by applying thereto a liquid containing blood derived albumin.

Claims

1. In an electrode assembly for insertion into a living animal to continuously monitor blood gas concentration, which assembly includes an electrode and a hydrophilic polymer membrane covering said electrode, wherein said membrane is hydrophilic substantially throughout its thickness, the improvement which comprises:

said covering membrane being pretreated by having applied thereto a liquid solution comprising blood derived albumin, said pretreated membrane than being sterilized; and

said electrode assembly exhibiting a lower T_S than an assembly having an untreated membrane.

2. The electrode assembly of claim 1 wherein the T_S is less than six hours.

3. The electrode assembly of claim 1 wherein said liquid solution is an aqueous solution.

4. The electrode assembly of claim 1 wherein said liquid solution is a solution of essembly pure blood derived albumin.

5. The electrode assembly of claim 4 wherein said blood derived albumin is human blood derived albumin.

6. The electrode assembly of claim 1 wherein said liguid solution is a solution of blood derived proteins.

7. The electrode assembly of claim 6 wherein said blood derived proteins are human blood derived proteins.

8. The electrode assembly of claim 1 wherein said liquid solution is blood serum.

9. The electrode assembly of claim 8 wherein said blood serum is human blood serum.

10. A method for decreasing the T_S of an electrode assembly for insertion in a living animal to continuously monitor blood gas concentration, which assembly includes an electrode and a hydrophilic polymer membrane covering said electrode, wherein said membrane is hydrophilic substantially throughout its thickness, comprising the steps:

pretreating said electrode by applying to said membrane a liquid solution comprising blood derived albumin and then sterilizing said electrode, whereby the T_S of said electrode assembly is substantially lower than an assembly having an untreated membrane.

11. The method of claim 10 wherein said liquid is applied by immersing said electrode in said liquid for at least 10 minutes.

12. The method of claim 11 wherein said electrode is immersed in said liquid for at least one hour.

13. The method of claim 10 wherein said electrode is dried after said solution is applied.

14. The method of claim 13 wherein said electrode is sterilized after it is dried.

15. The method of claim 13 wherein silicone is applied to said electrode prior to drying.