Programmable shunt with electromechanical valve actuator
Devices and methods for regulating and directing bodily fluids from one region of a patient to another region are disclosed. In general, an apparatus is provided that can include an implantable shunt system and a system controller. The implantable shunt system can have an adjustable valve for regulating the flow of fluid, a sensor element for measuring a physiological characteristic of a patient, and an electromechanical valve actuator that can be adapted to adjust a resistance of the valve. The implantable shunt system can be in electrical communication with the system controller. The system controller can generally be adapted to receive a physiological characteristic of the patient and operate the electromechanical valve actuator to adjust a resistance of the valve. The apparatus can also include an external programming device that is in communication with the system controller.
1. An apparatus for regulating fluid flow, comprising:
an implantable shunt system having:
an adjustable valve for regulating the flow of fluid,
a sensor element for measuring a physiological characteristic of a patient, and
an electromechanical valve actuator adapted to adjust a resistance of the valve; and
a system controller in electrical communication with the implantable shunt system and adapted to receive the physiological characteristic of the patient and operate the electromechanical valve actuator to adjust a resistance of the valve and thereby adjust a pressure threshold at which fluid begins to flow through the valve;
further comprising an external programming device in communication with the system controller;
wherein the external programming device includes a display for communicating the physiological characteristics of the patient to a user; and
wherein the external programming device includes a user input element, the external programming device being configured to communicate one or more instructions to the system controller based on user input.
2. The apparatus of claim 1 , wherein the valve is a ball valve.
3. The apparatus of claim 1 , wherein the electromechanical valve actuator comprises a spring operatively associated with a pressure setting mechanism, and at least one selected from the group consisting of an electric motor, a solenoid, and a linear actuator mechanically coupled to the pressure setting mechanism to vary a pressure applied by the spring to thereby adjust the resistance of the valve.
4. The apparatus of claim 3 , wherein the spring is a leaf spring.
5. The apparatus of claim 3 , wherein the spring is a helical spring.
6. The apparatus of claim 3 , wherein the pressure setting mechanism includes a motor driven rotor assembly adapted to adjust a resistance of the valve upon actuation of the motor.
7. The apparatus of claim 3 , wherein the pressure setting mechanism includes a motor driven stop member, the stop member being adapted to apply a force to the spring to adjust a resistance of the valve.
8. The apparatus of claim 1 , wherein the sensor element is a pressure sensor for detecting a cerebro-spinal fluid pressure.
9. The apparatus of claim 8 , wherein the system controller includes a microprocessor for comparing the measured pressure detected by the sensor to a target pressure.
10. The apparatus of claim 9 , wherein the system controller is configured to receive an input signal generated from the external programming device, the signal being representative of the target pressure.
11. The apparatus of claim 9 , wherein the microprocessor is programmed to calculate a desired resistance for the valve to achieve the target pressure.
12. The apparatus of claim 1 , wherein the controller is contained within the implantable shunt system.
13. The apparatus of claim 1 , further comprising an antenna in electrical communication with the system controller for communicating with the external programming device.
14. The apparatus of claim 13 , wherein the antenna is configured to communicate with the external programming device via RF communication.
15. The apparatus of claim 13 , wherein controller and antenna are disposed on an implant separate from the implantable shunt system.
16. The apparatus of claim 1 , wherein the implantable shunt system further includes a second sensor element for measuring an additional physiological characteristic, the second sensor element being configured to transmit data representing the measured value of the additional physiological characteristic to the system controller.
17. The apparatus of claim 1 , wherein the implantable shunt system further includes a battery for powering the system.
18. The apparatus of claim 1 , wherein the external programming device is adapted to power the implantable shunt system.
19. A system for regulating fluid flow, comprising:
a housing having an inlet port and an outlet port, the housing configured to carry a fluid between the inlet port and the outlet port;
a valve coupled to the housing and in fluid communication with the inlet port and the outlet port, the valve having an electromechanical valve actuator mechanically coupled to the valve and adapted to adjust a resistance of the valve and thereby adjust a pressure threshold at which fluid begins to flow through the valve;
an internal system controller in electrical communication with and adapted to operate the electromechanical valve actuator;
a sensor element in communication with the system controller and adapted to measure a physiological characteristic of a patient; wherein the sensor element is a pressure sensor for detecting pressure variations within the ventricular cavity; and
an external system controller adapted to communicate with the internal system controller and modify the operating parameters thereof.
20. The system of claim 19 , wherein the valve is a ball valve.
21. The system of claim 20 , wherein the electromechanical valve actuator comprises a spring operatively associated with a pressure setting mechanism, and at least one selected from the group consisting of an electric motor, a solenoid, and a linear actuator mechanically coupled to the pressure setting mechanism to vary a pressure applied by the spring to thereby adjust the resistance of the valve.
22. The system of claim 21 , wherein the spring is a leaf spring.
23. The system of claim 21 , wherein the spring is a helical spring.
24. The system of claim 19 , further comprising an antenna in electrical communication with the internal system controller for communicating with the external system controller.
25. A method for regulating cerebrospinal fluid flow in a hydrocephalus patient, comprising:
comparing a target value to a value detected by a sensor associated with an implantable shunt system; wherein the detected value is a physiological characteristic of the ventricular cavity; and
activating an electromechanical valve actuator of the implantable shunt system to adjust a resistance of a valve of the shunt system if the detected value is not equal to the target value.
26. The method of claim 25 , wherein detecting a value of a physiological characteristic comprises communicating data representative of the detected value of the physiological characteristic from the sensor element to a controller of the implantable shunt system.
27. The method of claim 26 , further comprising generating an activation signal via the controller to activate the electromechanical valve actuator.
28. The method of claim 27 , wherein generating an activation signal to activate the electromechanical valve actuator and adjust the resistance of the valve comprises determining a desired resistance to achieve the target value.
29. The method of claim 25 , further comprising transmitting the target value to a controller of the implantable shunt system.
30. The method of claim 29 , wherein the target value is transmitted via an external programming device.
31. The method of claim 30 , further comprising inputting one or more target values to the external programming device.
32. The method of claim 30 , further comprising energizing the implantable shunt system with the external programming device.
33. The method of claim 25 , wherein activating the electromechanical valve actuator to adjust a resistance of the valve is repeated until the detected value is equal to the target value.