An operable implant adapted to be implanted in the body of a patient, the operable implant comprising an operation device and a body engaging portion, wherein the operation device comprises a first unit comprising a receiving unit for receiving wireless energy and a first gear system adapted to receive mechanical work having a first force and first velocity, and output mechanical work having a different second force and a different second velocity. The operation device further comprises a second unit comprising an electrical motor adapted to transform electrical energy to the mechanical work, and a distance element adapted to separate the first and second units such that the receiving unit, when receiving wireless energy, is not substantially affected by the second unit.

An operable implant for hydraulically constricting the urethra of a patient for treating urinary incontinence, the operable implant comprising: a hydraulic constriction device for constricting the urethra, an operation device for operating the hydraulic constriction device, a connecting portion for connecting the operation device to the hydraulic constriction device, the connecting portion comprising at least one conduit for transferring hydraulic fluid from the operation device to the hydraulic constriction device, wherein the operation device comprises a reservoir for holding the hydraulic fluid to be transferred to the hydraulic constriction device, the reservoir comprising a movable wall portion for pumping fluid from the reservoir to the hydraulic constriction device.

Disclosed catheter insertion systems enable the user to identify the location of the needle based on the electrical properties of subcutaneous tissue relative the electrical properties of other fluids such as blood or air. Disclosed systems can include one or more of the following features: 1) the catheter assembly is modular (e.g., the catheter can be connected and disconnected from the detection unit at will); 2) the detection unit employs an electrical circuit that allows for the discernment between subcutaneous tissue and blood; 3) the system assists the end user with catheter advancement via an indicator output.