Implantable medical device comprising an hermetically sealed housing

• US 20020051551A1
• Filed: 08/27/2001
• Published: 05/02/2002
• Est. Priority Date: 08/25/2000
• Status: Active Grant

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Leysieffer, Hans, Fiedler, Dirk A.
• Granted Patent: US 6,736,770 B2
• Time in Patent Office: Days
• US Class Current: 381/323
• CPC Class Codes: A61N 1/36036 of the outer, middle or inner ear
• CPC Class Codes: A61N 1/36038 Cochlear stimulation
• CPC Class Codes: A61N 1/375 Constructional arrangements, e.g. casings

Abstract

The invention relates to an implantable medical device having an hermetically tight housing, which houses an electronic unit as well as an electrochemical energy storage for supplying the medical device with current. The energy storage is arranged directly within the hermetically tight housing without having a separate housing.

Claims

1. An implantable medical device comprising an hermetically sealed housing which houses an electronic unit and an electrochemical energy storage for supplying electric current to the medical device, wherein the energy storage is disposed directly within the hermetically sealed housing and does not have a separate housing.

2. The device as claimed in claim 1 wherein the energy storage is a battery with solid electrolyte system.

3. The device as claimed in claim 2 wherein the energy storage energy storage is a lithium based battery.

4. The device as claimed in claim 1 wherein the electronic unit is a unit for monitoring the energy storage.

5. The device as claimed in claim 4 wherein the electronic unit further controls the delivery of energy from the energy storage.

6. The device as claimed in claim 1 wherein the electronic unit is a unit for controlling the medical device.

7. The device as claimed in claim 6 wherein the electronic unit further is adapted for control of the energy storage.

8. The device as claimed in claim 1 wherein the energy storage is a primary battery.

9. The device as claimed in claim 1 wherein the energy storage is a secondary battery.

10. The device as claimed in claim 9 wherein the electronic unit is adapted to monitor and control the charging of the energy storage such that the operational state of the energy storage is maintained within a predetermined range in which damage of the energy storage and escape of gas are substantially prevented.

11. The device as claimed in claim 10 wherein the electronic unit is adapted to interrupt the charging process when the operational state of the energy storage is impending to leave the predetermined range.

12. The device as claimed in claim 2 wherein the energy storage and the electronic unit are mounted on a common support.

13. The device as claimed in claim 12 wherein the support is in the shape of a plate and wherein the energy storage and the electronic unit are mounted on different sides of the support.

14. The device as claimed in claim 1 wherein the hermetically sealed housing comprises means to bind gas which possibly might leave the energy storage.

15. The device as claimed in claim 14 wherein the gas binding means comprises an adsorption material.

16. The device as claimed in claim 15 wherein the adsorption material comprises molecular sieve material.

17. The device as claimed in claim 9 comprising a receiving coil to which energy may be electromagnetically fed transcutaneously from an external charging device to recharge the energy storage.

18. The device as claimed in claim 17 wherein the receiving coil is disposed in a biocompatible polymer enclosure at the outer side of the hermetically sealed housing and is in mechanical connection with the housing.

19. The device as claimed in claim 18 wherein the receiving coil is disposed at the narrower face of the hermetically sealed housing so as to project therefrom.

20. The device as claimed in claim 1 wherein the electronic unit comprises a coil for exchanging data with an external telemetry unit for controlling the medical device.

21. The device as claimed in claim 1 wherein the hermetically sealed housing is provided at the outer side thereof with feed-through contacts for a sensoric component and an actoric component.

23. The device as claimed in claim 1 wherein the medical device is a hearing aid.