摘要:
An insertion tool uses a stylet wire to help guide an electrode system into a cochlea. The insertion tool includes three main elements or parts: a handle, a guide and a slider. The handle is made from light stainless steel tube flattened in front with a machined slot. The guide consists of a plurality of metal tubes, fixed to each other within a holding bracket. In one embodiment, the slider includes a stabilizer wire, a long stylet wire, and a short stylet wire. During the assembly process, the stabilizer and stylet wires are inserted into respective tubes of the guide and the end of the stabilizer wire is bent to form an offset. The electrode system is loaded onto the tool by inserting the short stylet wire into a holder that supports the electrode lead.
摘要:
An implantable stimulator(s), small enough to be located near or within an area of the spine responsible for sensations in a region experiencing chronic pain uses a power source/storage device, such as a rechargeable battery. Periodic recharging of such a power source/storage device is accomplished, for example, by inductive coupling with an external appliance. The small stimulator provides a means of stimulating a nerve(s) or other tissue when desired, without the need for external appliances during the stimulation session. When necessary, external appliances are used for the transmission of data to and/or from the stimulator(s) and for the transmission of power, it necessary. In a preferred embodiment, the system is capable of open- and closed-loop operation. In closed-loop operation, at least one implant includes at least one sensor, and the sensed condition is used to adjust stimulation parameters.
摘要:
A small implantable stimulator(s) includes at least two electrodes for delivering electrical stimulation to surrounding tissue and/or a pump and at least one outlet for delivering a drug or drugs to surrounding tissue. One electrochemotherapy method disclosed includes delivery of electrical stimulation in the form of a direct electric current and/or a periodic waveform that locally potentiates the cytotoxic effects of a systemically and/or locally administered chemotherapy agent(s). Open- and closed-loop systems are disclosed.
摘要:
A paddle-type electrode or electrode array is implantable like a percutaneously inserted lead, i.e., without requiring major surgery. Once implanted, the electrode array provides a platform for many electrode configurations. In a preferred embodiment, the electrode array is provided on a flexible, foldable or compressible, subcarrier or substrate. Such subcarrier or substrate folds or compresses during implantation, thereby facilitating its insertion using an insertion needle. Once implanted, such subcarrier or substrate expands, thereby placing the electrodes in a desired spaced-apart positional relationship, and thus achieving a desired electrode array configuration. The insertion needle has a lumen with a non-circular cross-sectional shape, e.g., having a width greater than its height, to facilitate sliding the folded or compressed paddle-type electrode array therein.
摘要:
A method of positioning an electrode array within a human cochlea includes making a flexible positioner as a curved or hooked shape from a silicone polymer. The positioner is adapted to be inserted into the scala tympani duct of a human cochlea. The positioner may be inserted into the scala tympani duct before, concurrent with, or after, insertion of the electrode array. The flexible positioner fills space within the scala tympani duct so as to force the electrode array, also inserted into the scala tympani duct, against the modiolar wall of the cochlea, where the electrode contacts of the electrode array may be more effective. In one embodiment, a channeling groove is formed along one side of the positioner for receiving the electrode array. Also, in one embodiment, a silastic tube forms a molded-in tube within the molded positioner, and provides a lumen, sealed or closed at its distal end, into which a stylet wire may be inserted during the insertion process.
摘要:
An electrode array has an elongate flexible carrier that, when viewed in cross-section, is much more flexible in a first direction than in a second direction orthogonal thereto. The elongate flexible carrier is formed with a bias force that causes the array to flex in the first direction so as to assume the general spiral or circular shape of the scala tympani duct within the cochlea. The less-flexible direction is the direction that makes it difficult for the array to twist as it is inserted within the scala tympani duct. The bias force is sufficiently strong to cause the array to assume its preformed spiral shape even after being straightened during initial insertion into the cochlea. Electrode contacts, embedded into the carrier so as to be exposed along an inner or concave surface of the spiral, thus wrap snugly around the modiolus, thereby positioning the electrode contacts against the modiolar wall in an optimum position for stimulation.
摘要:
A tapered, flexible positioner, typically molded in a curved or hooked shape from a silicone polymer, is adapted to be inserted into the scala tympani duct of a human cochlea so as to position or force an electrode array, also inserted into the scala tympani duct, against the modiolar wall of the cochlea. The positioner may be inserted into the scala tympani duct before, or preferably after, insertion of the electrode array. The flexible positioner thus fills space within the scala tympani duct so as to force the electrode array, also inserted into the scala tympani duct, against the modiolar wall of the cochlea, where the electrode contacts of the electrode array may be more effective. In a preferred embodiment, a channeling groove is formed along one side of the positioner for receiving the electrode array. Also, in the preferred embodiment, a silastic tube forms a molded-in tube within the molded positioner, and provides a lumen, sealed or closed at its distal end, into which a stylet wire may be inserted during the insertion process.
摘要:
Miniature implantable stimulators (i.e., microstimulators) with programmably configurable electrodes allow, among other things, steering of the electric fields created. In addition, the microstimulators are capable of producing unidirectionally propagating action potentials (UPAPs).
摘要:
A cochlear stimulation lead and method of making a curved electrode array are provided. In one embodiment of the lead, while the curved section of the lead is curled further beyond its originally molded curvature and held in this position, a filling channel is filled with a filling material that is hardened or cured in this held position. The resulting lead has a tip curvature that is more curved than the originally molded curvature.
摘要:
An implantable microdevice includes at least one electrode detachably connected to electronic circuitry housed in an hermetically-sealed micro housing. The micro housing has a length no more than about 10 mm. In one embodiment, the electrode is located at a distal end of an electrode lead, and a proximal end of the electrode lead is removably inserted into a connector that forms part of the micro housing.