Strain relief systems for active implantable medical devices

An implantable medical device configured for implant in a hole in cranium of a patient, relative to a bone table corresponding to a surface of the cranium adjacent the hole, the implantable medical device comprising:

• a can having an electrical-contact pad, the can characterized by a form factor having a perimeter edge defining a boundary of the can, and a recessed portion with an upper surface positioned to lie beneath the bone table when the can is placed in the hole, and that supports the electrical-contact pad;
• a cover assembly having a plurality of ports, each of the plurality of ports configured to receive a connector end of a lead, the cover assembly configured to couple to the can and decouple from the can at the electrical-contact pad;
• and
• a strain relief system comprising:
• a lower strain relief defining a plurality of channels, wherein each of the plurality of channels is configured to receive a portion of a lead body and includes a curved portion that extends upward from a proximal end at or near the upper surface of the recessed portion to a distal end at the bone table, and a generally linear portion that extends from the distal end of the curved portion to a terminating end beyond the perimeter edge of the can, and
• an upper strain relief configured to mechanically couple to and mechanically decouple from one or both of the cover assembly and the lower strain relief, wherein the upper strain relief covers the plurality of channels of the lower strain relief,
• wherein the lower strain relief extends from the cover assembly and the cover assembly comprises a housing and the lower strain relief extends from a footing that is configured to mechanically couple to and mechanically decouple from the housing.

An implantable medical device configured for implant in a hole in cranium of a patient, relative to a bone table corresponding to a surface of the cranium adjacent the hole, the implantable medical device comprising:

• a can having an electrical-contact pad, the can characterized by a form factor having a perimeter edge defining a boundary of the can, and a recessed portion with an upper surface positioned to lie beneath the bone table when the can is placed in the hole, and that supports the electrical-contact pad;
• a cover assembly having a plurality of ports, each of the plurality of ports configured to receive a connector end of a lead, the cover assembly configured to couple to the can and decouple from the can at the electrical-contact pad;
• and
• a strain relief system comprising:
• a lower strain relief defining a plurality of channels, wherein each of the plurality of channels is configured to receive a portion of a lead body and includes a curved portion that extends upward from a proximal end at or near the upper surface of the recessed portion to a distal end at the bone table, and a generally linear portion that extends from the distal end of the curved portion to a terminating end beyond the perimeter edge of the can, and
• an upper strain relief configured to mechanically couple to and mechanically decouple from one or both of the cover assembly and the lower strain relief, wherein the upper strain relief covers the plurality of channels of the lower strain relief,
• wherein the lower strain relief extends from the cover assembly and each of the upper strain relief and the lower strain relief extends beyond the perimeter edge of the can a same distance.

An implantable medical device configured for implant in a hole in cranium of a patient, relative to a bone table corresponding to a surface of the cranium adjacent the hole, the implantable medical device comprising:

• a can having an electrical-contact pad, the can characterized by a form factor having a perimeter edge defining a boundary of the can, and a recessed portion with an upper surface positioned to lie beneath the bone table when the can is placed in the hole, and that supports the electrical-contact pad;
• a cover assembly having a plurality of ports, each of the plurality of ports configured to receive a connector end of a lead, the cover assembly configured to couple to the can and decouple from the can at the electrical-contact pad;
• and
• a strain relief system comprising:
• a lower strain relief defining a plurality of channels, wherein each of the plurality of channels is configured to receive a portion of a lead body and includes a curved portion that extends upward from a proximal end at or near the upper surface of the recessed portion to a distal end at the bone table, and a generally linear portion that extends from the distal end of the curved portion to a terminating end beyond the perimeter edge of the can, and
• an upper strain relief configured to mechanically couple to and mechanically decouple from one or both of the cover assembly and the lower strain relief, wherein the upper strain relief covers the plurality of channels of the lower strain relief,
• wherein the lower strain relief extends from the cover assembly and the lower strain relief extends beyond the perimeter edge of the can a distance less than the upper strain relief and the upper strain relief comprise a plurality of overbite features that extend inward in front of the terminal end of the lower strain relief.

An implantable medical device configured for implant in a hole in cranium of a patient, relative to a bone table corresponding to a surface of the cranium adjacent the hole, the implantable medical device comprising:

• a can having an electrical-contact pad, the can characterized by a form factor having a perimeter edge defining a boundary of the can, and a recessed portion with an upper surface positioned to lie beneath the bone table when the can is placed in the hole, and that supports the electrical-contact pad;
• a cover assembly having a plurality of ports, each of the plurality of ports configured to receive a connector end of a lead, the cover assembly configured to couple to the can and decouple from the can at the electrical-contact pad;
• and
• a strain relief system comprising:
• a lower strain relief defining a plurality of channels, wherein each of the plurality of channels is configured to receive a portion of a lead body and includes a curved portion that extends upward from a proximal end at or near the upper surface of the recessed portion to a distal end at the bone table, and a generally linear portion that extends from the distal end of the curved portion to a terminating end beyond the perimeter edge of the can, and
• an upper strain relief configured to mechanically couple to and mechanically decouple from one or both of the cover assembly and the lower strain relief, wherein the upper strain relief covers the plurality of channels of the lower strain relief,
• wherein the lower strain relief comprises:
• a proximal part associated with the upper surface of the recessed portion of the can, and that defines the curved portion of the lower strain relief;
• and
• a distal part that defines the generally linear portion of the lower strain relief.