Leadless tissue stimulation systems and methods
View Patent ↗Systems including an implantable receiver-stimulator and an implantable controller-transmitter are used for leadless electrical stimulation of body tissues. Cardiac pacing and arrhythmia control is accomplished with one or more implantable receiver-stimulators and an external or implantable controller-transmitter. Systems are implanted by testing external or implantable devices at different tissue sites, observing physiologic and device responses, and selecting sites with preferred performance for implanting the systems. In these systems, a controller-transmitter is activated at a remote tissue location to transmit/deliver acoustic energy through the body to a receiver-stimulator at a target tissue location. The receiver-stimulator converts the acoustic energy to electrical energy for electrical stimulation of the body tissue. The tissue locations(s) can be optimized by moving either or both of the controller-transmitter and the receiver-stimulator to determine the best patient and device responses.
1. A method for selecting and optimizing the implant locations of a controller-transmitter device and a receiver-stimulator device, said method comprising:
(a) positioning a controller-transmitter at a remote tissue location;
(b) positioning a receiver-stimulator at a target tissue location;
(c) activating the controller-transmitter to deliver acoustic energy to the receiver-stimulator so that said receiver-stimulator delivers electrical energy into the target tissue location;
(d) observing a first response;
(e) repositioning at least one of the controller-transmitter and the receiver-stimulator and observing a subsequent response;
(f) comparing the first and subsequent response;
(g) determining whether the controller-transmitter and receiver-stimulator positions are satisfactory;
(h) repeating steps (e)-(g) until the controller-transmitter and receiver-stimulator positions are satisfactory;
(i) selecting the positions that are satisfactory; and
(j) implanting an implantable controller-transmitter device and the receiver-stimulator device at the selected positions.
2. A method as in claim 1 , wherein the controller-transmitter used for positioning is an externally applied device used to select the site for the implantable controller-transmitter device.
3. A method as in claim 1 , wherein at least one of the first and the subsequent response is an observed patient response.
4. A method as in claim 3 , wherein the target tissue location is cardiac tissue, the remote tissue location is on the chest over the heart, and the observed patient response is heart function.
5. A method as in claim 3 , wherein the target tissue location is cardiac tissue, the remote tissue location is on the chest over the heart, and the observed patient response is electrocardiographic.
6. A method as in claim 1 , wherein at least one of the first and the subsequent response is a device measurement.
7. A method as in claim 6 , wherein the device measurement is an electrical output amplitude of the receiver-stimulator.
8. A method as in claim 6 , wherein the device measurement is an acoustic output amplitude of the controller-transmitter.
9. A method as in claim 6 , wherein the device measurement is efficiency of energy transmission from the controller-transmitter to the receiver-stimulator.
10. A method as in claim 1 , wherein the target tissue location is held constant at a predetermined site while only the remote tissue location is varied.
11. A method as in claim 1 , wherein the remote tissue location is held constant at a predetermined site while only the target tissue location is varied.
12. A method as in claim 1 , wherein both the target tissue location and the remote tissue location are varied.