Lead For An Active Implantable Medical Device Wtih A Chip For Electrode Multiplexing

• US 20120150009A1
• Filed: 12/14/2011
• Published: 06/14/2012
• Est. Priority Date: 12/14/2010
• Status: Active Grant

• Current Assignee: Sorin CRM SAS (MicroPort Scientific Corp.)
• Original Assignee: Sorin CRM SAS (MicroPort Scientific Corp.)
• Inventors: Ollivier, Jean-François
• Granted Patent: US 9,020,574 B2
• Time in Patent Office: Days
• US Class Current: 600/374
• CPC Class Codes: A61B 2562/125 characterised by the manufacture of electrodes
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/125 objective methods
• CPC Class Codes: A61B 5/273 Connection of cords, cables or leads to electrodes
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 8/06 Measuring blood flow measuring volume flow in general G01F, e.g. G01F1/66, G01F1/72; measuring speed of fluids in general G01P5/00
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/0587 Epicardial electrode systems; Endocardial electrodes piercing the pericardium
• CPC Class Codes: H01R 43/20 for assembling or disassembling contact members with insulating base, case or sleeve
• CPC Class Codes: Y10S 439/909 Medical use or attached to human body
• CPC Class Codes: Y10T 29/49146 with encapsulating, e.g., potting, etc.
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor
• CPC Class Codes: Y10T 29/49171 with encapsulating

Abstract

A lead for active implantable medical devices comprising a chip, notably for electrode multiplexing. The lead (10) includes an insulating supporting tube (20) interposed in a flexible elongated tube, with a central bore (22) coaxial with the lumen of the lead. The supporting tube comprises on its surface at least one crossing conductive strip (28) extending in the axial direction. A chip (18) on a flexible substrate is disposed with a bent or curved conformation in a receptacle of the supporting tube isolated from the conductive strip. An electrode, e.g., for cardiac sensing/pacing, (16) on the supporting tube (20) is electrically connected to an outer conductive pad (24) of the chip. The conductive strip is connected (i) at each end (28b), face to face to a conductive connection (12), housed in the sheath, and (ii) in a central region (28a), to an inner conductive pad (26) of the chip.

Claims

1. A lead for an active implantable medical device, comprising:

an elongated flexible sheath (10) having a central lumen and at least one conductive connection (12, 14) housed in said central lumen of the sheath; and

a rigid cylindrical supporting tube (20) of an insulating material, having a surface, a central region, and a crossing central bore (22), the supporting tube being interposed in the sheath so that its central bore is coaxial with the lumen of the sheath;

the supporting tube comprising;

a cavity in its surface forming a chip receptacle (32), opening into the central region (30) of the supporting tube,

at least one electrode (16, 52) arranged on the supporting tube (20) surface; and

at least one chip (18) comprising a substrate and at least two conductive contact pads (26, 24) respectively connected to the conductive connection and to the at least one electrode, an outer conductive pad (24) on a first side of the substrate and an inner conductive pad (26) on a second side of the substrate, the at least one electrode (16;

52) being electrically connected to the outer conductive pad (24); and

a feedthrough conductor (28) having a central region (28a) connected to the inner conductive pad (26) of the chip and two end regions (28b), wherein;

the substrate of the chip (18) is a flexible substrate, disposed with a bent conformation in the receptacle (32) of the supporting tube;

the conductive connection housed by the sheath includes a disconnect at the supporting tube location; and

the feedthrough conductor is a conductive strip (28) formed on the supporting tube, and extending axially along the supporting tube and connected at each of its ends (28b) to the opposing conductive connection (12) located in the sheath.

2. The lead of claim 1 wherein the conductive strip is formed on the outer surface of the supporting tube.

3. The lead of claim 1, wherein the insulating material of the supporting tube comprises a ceramic.

4. The lead of claim 1, wherein the at least one electrode comprises a conductor sleeve-shaped single annular electrode (16) circumferentially extending around the entire periphery of the supporting tube and in the central region (30) thereof.

5. The lead of claim 4 wherein the electrode comprises a detection/stimulation electrode.

6. The lead of claim 1 wherein the electrode comprises a cardiac sensing/pacing electrode.

7. The lead of claim 1, wherein the at least one electrode comprises a plurality of sector electrodes (52) isolated from each other and circumferentially distributed around the perimeter of the supporting tube, and the chip (18) comprises a plurality of outer conductive pads (24), each of said plurality of sector electrodes being connected to a corresponding one of a plurality of outer conductive pads (24) of the chip.

8. The lead of claim 7 wherein the plurality of sector electrodes comprises a detection/stimulation electrode configuration for cardiac pacing.

9. The lead of claim 1, wherein the lead comprises a region including the sheath interrupted by supporting tube and said region has an overall outer diameter that is essentially constant and equal to the outer diameter of the flexible sheath.

10. The lead of claim 1, wherein the conductive connection further comprises two distinct conductive connections (12, 14) housed in the lumen of the sheath, and the crossing conductive strip further comprises a first and second crossing conductive strips (28), isolated from each other on the supporting tube, said first crossing conductive strip corresponding to one of said two distinct conductive connections and the second crossing conductive strip corresponding to the other of said two distinct conductive connections.

11. The lead of claim 10, wherein said first and second crossing conductive strips are disposed on diametrically opposed regions of the supporting tube surface.

12. The lead of claim 1 wherein the bent configuration of the flexible substrate further comprises a curved surface flush with the surface of the supporting tube.