Electrical connection for an actuator unit
An implantable connection cable assembly for an actuator unit of an implant, and related manufacturing method, involve a plug connector and a cable strand which ends in the plug connector and has at least two connection cables. The plug connector has a plug housing and at least two contact elements each connected to a connection cable, wherein the contact elements are fixed in the plug housing. The contact elements of the plug connector can each have a cable receptacle for electrical connection to the connection cable of the cable strand and a separate connection interface for electrical connection to the drive assembly of the actuator unit, wherein the cavities between the plug housing, the contact elements and the cable strand are filled with a potting compound.
1 . An implantable connection cable assembly for an actuator unit of an implant comprising:
a plug connector and a cable strand which ends in the plug connector and has at least two connection cables, wherein the plug connector has a plug housing and at least two contact elements each connected to a connection cable, wherein the contact elements are fixed in the plug housing; and
wherein the at least two contact elements of the plug connector each have a cable receptacle configured for electrical connection to a respective connection cable of the cable strand, and a separate connection interface configured for electrical connection to a drive assembly of the actuator unit, wherein cavities between the plug housing, the contact elements and the cable strand are filled with a potting compound.
2 . The implantable connection cable assembly according to claim 1 , comprising:
an electrically insulating receptacle, in which the contact elements are fixed, the electrically insulating receptacle being received in the plug housing.
3 . The implantable connection cable assembly according to claim 2 ,
wherein the electrically insulating receptacle has a bore, and wherein the potting compound for filling the cavities is selected for interpretation into the plug housing through the bore.
4 . The implantable connection cable assembly according to claim 1 , wherein the potting compound is a biocompatible silicone potting compound and/or a biocompatible epoxy resin potting compound, the potting compound comprising:
at least two regions of different viscosity, wherein at least one first region of the at least two regions including a low viscosity potting compound and at least one second region of the at least two regions including a viscous potting compound.
5 . The implantable connection cable assembly according to claim 1 , wherein the separate connection interfaces of the at least two contact elements are configured as contact sockets for receiving contact pins.
6 . The implantable connection cable assembly according to claim 5 , wherein the contact sockets for receiving the contact pins comprise:
a groove in which an electrically conductive, obliquely wound spring is arranged to form an electrical contact with the contact pins.
7 . The implantable connection cable assembly according to claim 1 , wherein the contact elements are gold-plated or formed by a corrosion-resistant metal alloy.
8 . The implantable connection cable assembly according to claim 1 , wherein the plug housing is formed by a weldable biocompatible metal, and/or a corrosion-resistant weldable metal.
9 . The implantable connection cable assembly according to claim 1 , wherein an earthing contact is provided in the cavity between the cable strand and the plug housing.
10 . The implantable connection cable assembly according to claim 1 , wherein the implantable connection cable assembly is configured to be connectable to a drive assembly with an electric motor to the actuator unit of an implant.
11 . An actuator unit of the implant comprising:
a separately manufactured drive assembly with an electric motor and a separately manufactured implantable connection cable assembly according to claim 1 , wherein the drive assembly and the implantable connection cable assembly are non-releasably connected to one another.
12 . The implantable connection cable assembly according to claim 3 , wherein the bore is centrally arranged.
13 . A method for manufacturing an actuator unit of an implant having a drive assembly with an electric motor and an implantable connection cable assembly, the method comprising:
separately manufacturing the drive assembly, the drive assembly having electrical contacts configured for electrical connection to the implantable connection cable assembly;
separately manufacturing the implantable connection cable assembly with a plug connector and a cable strand which ends in the plug connector, the plug connector having contact elements configured for electrical connection to the electrical contacts of the drive assembly;
releasably connecting the drive assembly and the implantable connection cable assembly during installation of the actuator unit; and
subsequently non-releasably connecting the drive assembly and the implantable connection cable assembly.
14 . The method for manufacturing the actuator unit of the implant according to claim 13 , wherein the separately manufactured drive assembly and the separately manufactured implantable connection cable assembly are hermetically sealed against liquids and gases.
15 . The method for manufacturing the actuator unit of the implant according to claim 14 , wherein separately manufacturing the implantable connection cable assembly comprises:
filling cavities of the plug connector between a plug housing, the cable strand, the connection cables emerging from the cable strand and the contact elements of the plug connector connected to the connection cables with a potting compound, which is a biocompatible silicone potting compound and/or a biocompatible epoxy resin potting compound.
16 . The method for manufacturing the actuator unit of the implant according to claim 13 , comprising:
non-releasably connecting the drive assembly and the implantable connection cable assembly in a final manufacturing step of the actuator unit, by welding and and/or by continuous-wave laser welding.
17 . The implantable connection cable assembly according to claim 9 , wherein the earthing contact is an obliquely wound spring contact.
18 . The actuator unit according to claim 11 , wherein the drive assembly and the implantable connection cable assembly are connected by a laser weld.