Sensor over-mold shape

• US 9,517,032 B2
• Filed: 01/31/2012
• Issued: 12/13/2016
• Est. Priority Date: 01/31/2012
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Flo, Daniel S., Carney, James K., Mothilal, Kamal Deep, Schell, Jon D.
• Primary Examiner(s): ALLEN, ANDRE J
• Application Number:
  US13/362,371
• Publication Number:
  US 20130197336A1
• Time in Patent Office: 1,778 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A61B 2560/0406 specially shaped apparatus housings
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/162 Capsule shaped sensor housings, e.g. for swallowing or implantation
• CPC Class Codes: A61B 2562/18 Shielding or protection of sensors from environmental influences, e.g. protection from mechanical damage
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/6861 Capsules, e.g. for swallowing or implanting
• CPC Class Codes: A61B 5/6876 Blood vessel
• CPC Class Codes: G01L 19/146 using flexible element between the transducer and the support

Abstract

An implantable sensor module and medical device includes a housing having an inner shell having a thickness extending between an inner wall and an outer wall and an outer layer, wherein the inner shell and the outer layer form a substantially flat portion. A shoulder extends adjacent to a diaphragm to extend the outer layer laterally away from a central medial line extending between edges of the diaphragm. A recess portion is formed between the diaphragm and an inner side of the outer layer, and an over-fill channel is formed by the outer layer extending through the outer layer from an opening formed at the outer wall to an opening formed along the inner side of the outer layer extending along the substantially flat portion.

Claims

1. An implantable medical device, comprising:

a housing having an outer wall and comprising an inner shell and an outer layer formed to extend over and enclose the inner shell to form the outer wall, the inner shell having a thickness extending between an inner wall of the inner shell and an outer wall of the inner shell, the outer layer having an inner side engaged against the outer wall of the inner shell and having a thickness extending between the inner side and the outer wall of the housing, wherein the inner shell and the outer layer form a flat portion;

a flexible diaphragm formed within the inner shell along the flat portion and extending between a first edge and a second edge;

a shoulder extending adjacent to the first edge that extends the outer layer laterally away from a central medial line extending between the first and second edges of the diaphragm;

a recess portion formed between the diaphragm and the inner side of the outer layer; and

an over-fill channel formed by the outer layer and extending through the outer layer from an opening formed at the outer wall to an opening formed along the inner side of the outer layer extending along the flat portion.

2. The device of claim 1, wherein the shoulder is formed by one or both of the inner shell and the outer layer to have a thickness to reduce contact pressure along the first edge and the second edge of the diaphragm to less than a predetermined percentage of a maximum contact pressure along the central median line.

3. The device of claim 2, further comprising a second shoulder extending adjacent to the second edge of the diaphragm that extends the outer layer laterally away from the central medial line extending between the first and second edges of the diaphragm.

4. The device of claim 1, wherein the shoulder comprises a flange extending laterally outward from the outer wall of the housing.

5. The device of claim 4, wherein housing has a rectangular cross-section comprising a top side and a bottom side, the top side corresponding to the flat portion formed by the inner shell and the outer layer.

6. The device of claim 1, wherein the thickness of the outer layer along the shoulder is greater than the thickness of the outer layer along a portion of the outer wall of the housing opposite the flat portion.

7. The device of claim 6, wherein the thickness of the inner shell along the shoulder is approximately equal to the thickness of the inner shell along the portion of the outer wall of the housing opposite the flat portion.

8. The device of claim 1, wherein the thickness of the inner shell along the shoulder is greater than the thickness of the inner shell along a portion of the outer wall of the housing opposite the flat portion.

9. The device of claim 8, wherein the thickness of the outer layer along the shoulder is approximately equal to the thickness of the outer layer along the portion of the outer wall of the housing opposite the flat portion.

10. The device of claim 1, wherein the thickness of the outer layer along the shoulder is greater than the thickness of the outer layer along a portion of the outer wall of the housing opposite the flat portion, and the thickness of the inner shell along the shoulder is greater than the thickness of the inner shell along the portion of the outer wall of the housing opposite the flat portion.

11. The device of claim 10, wherein the thickness of the outer layer along the shoulder is equal to the thickness of the inner shell along the shoulder.

12. The device of claim 1, wherein the over-fill channel extends through the shoulder.

13. An implantable medical device lead, comprising:

an elongated lead body;

a housing having an outer wall and comprising an inner shell and an outer layer formed to extend over and enclose the inner shell to form the outer wall, the inner shell having a thickness extending between an inner wall of the inner shell and an outer wall of the inner shell, the outer layer having an inner side engaged against the outer wall of the inner shell and having a thickness extending between the inner side and the outer wall of the housing, wherein the inner shell and the outer layer form a flat portion;

a flexible diaphragm formed within the inner shell along the flat portion and extending between a first edge and a second edge;

a shoulder extending adjacent to the first edge that extends the outer layer laterally away from a central medial line extending between the first and second edges of the diaphragm;

a recess portion formed between the diaphragm and the inner side of the outer layer; and

an over-fill channel formed by the outer layer and extending through the outer layer from an opening formed at the outer wall to an opening formed along the inner side of the outer layer extending along the flat portion.

14. The implantable medical device lead of claim 13, wherein the shoulder is formed by one or both of the inner shell and the outer layer to have a thickness to reduce contact pressure along the first edge and the second edge of the diaphragm to less than a predetermined percentage of a maximum contact pressure along the central median line.

15. The implantable medical device lead of claim 14, further comprising a second shoulder extending adjacent to the second edge of the diaphragm that extends the outer layer laterally away from the central medial line extending between the first and second edges of the diaphragm.

16. The implantable medical device lead of claim 13, wherein the shoulder comprises a flange extending laterally outward from the outer wall of the housing.

17. The implantable medical device lead of claim 16, wherein housing has a rectangular cross-section comprising a top side and a bottom side, the top side corresponding to the flat portion formed by the inner shell and the outer layer.

18. The implantable medical device lead of claim 13, wherein the thickness of the outer layer along the shoulder is greater than the thickness of the outer layer along a portion of the outer wall of the housing opposite the flat portion.

19. The implantable medical device lead of claim 18, wherein the thickness of the inner shell along the shoulder is approximately equal to the thickness of the inner shell along the portion of the outer wall of the housing opposite the flat portion.

20. The implantable medical device lead of claim 13, wherein the thickness of the inner shell along the shoulder is greater than the thickness of the inner shell along a portion of the outer wall of the housing opposite the flat portion.

21. The implantable medical device lead of claim 20, wherein the thickness of the outer layer along the shoulder is approximately equal to the thickness of the outer layer along the portion of the outer wall of the housing opposite the flat portion.

22. The implantable medical device lead of claim 13, wherein the thickness of the outer layer along the shoulder is greater than the thickness of the outer layer along a portion of the outer wall of the housing opposite the flat portion, and the thickness of the inner shell along the shoulder is greater than the thickness of the inner shell along the portion of the outer wall of the housing opposite the flat portion.

23. The implantable medical device lead of claim 22, wherein the thickness of the outer layer along the shoulder is equal to the thickness of the inner shell along the shoulder.

24. The implantable medical device lead of claim 13, wherein the over-fill channel extends through the shoulder.