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Publication Number
US-11864789-B2
Publication Date
2024-01-09
Expiration Date
Abstract
Devices for removing implanted objects from body vessels are provided. A device includes a sheath assembly having a cutting tip. The cutting tip includes a cutting surface that is adapted to cut tissue coupled to an implanted object as the cutting tip rotates. The sheath assembly further includes an outer shield carried outside of the cutting tip. The outer shield includes a distal opening, and the outer shield is translatable relative to the cutting tip from a first position to a second position and vice versa. In the first position the cutting surface of the cutting tip is disposed within the outer shield, and in the second position the cutting tip extends through the distal opening and the cutting surface is at least partially disposed outside of the outer shield.
Core Innovation
The invention provides a device for removing an implanted object from a body vessel that includes an outer sheath and an inner sheath disposed within the outer sheath. The inner sheath includes a cutting tip having a cutting surface, and a cutting tip drive mechanism includes a motor configured to rotate the cutting tip such that, upon actuation of the motor, the cutting tip rotates and translates longitudinally.
The device further includes a sensor that provides a position signal indicative of a home position for the cutting tip drive mechanism. A controller includes a non-transitory computer-readable medium with instructions that actuate the motor and calibrate a position of the motor based at least in part on the position signal received from the sensor while the motor is actuated.
The controller instructions control motor rotation direction relative to the sensor-indicated home position, including rotating the motor in a first direction and then rotating in a second direction opposite the first direction until the position signal indicating the home position is received again. In embodiments that further include a current sensor providing an alert signal when motor current exceeds a threshold, the controller rotates the motor in the first direction until either the position signal is received or the alert signal is received, and then rotates in the second direction opposite the first direction until the position signal is received.
Claims Coverage
The independent claims include five inventive claim sets, focused on a motor-driven cutting tip device for removing an implanted object from a body vessel with sensor-based calibration to a home position, and in some instances motor-current threshold alert handling. Across the independent claims, the core inventive structure is consistent: outer sheath, inner sheath with cutting tip, motor rotating and longitudinally translating the cutting tip, sensor providing a home position signal, and controller instructions for calibration during motor actuation.
Sensor-based motor calibration to a home position
A controller actuates a motor and calibrates a position of the motor based at least in part on a position signal indicative of a home position for the cutting tip drive mechanism while the motor is actuated.
Bidirectional motor rotation to reach home position
The controller rotates the motor in a first direction until the position signal indicating the home position for the cutting tip drive mechanism is received, and further rotates the motor in a second direction opposite the first direction until the position signal indicating the home position is again received.
Conditional stop and opposite-direction move based on home position signal
The controller rotates the motor in a first direction, discontinues rotation in the first direction if the position signal indicating the home position is received, and rotates the motor in a second direction opposite the first direction if the position signal indicating the home position is not received.
Zero position calibration to current cutting tip drive position
After the position signal indicating that the home position for the cutting tip drive mechanism is received, the controller calibrates the cutting tip drive mechanism so that a zero position of the motor corresponds to the current position of the cutting tip drive mechanism.
Motor-current threshold alert affecting motor direction during calibration
A current sensor produces a current signal indicative of the motor exceeding a predetermined current threshold, and the controller rotates the motor in a first direction until either the position signal is received or the alert signal is received, and if the alert signal is received, rotates the motor in a second direction opposite the first direction until the position signal is received.
Across the independent claims, the inventive coverage is directed to ensuring a motor-driven cutting tip drive mechanism can be calibrated using a sensor-provided home position signal while controlling bidirectional motor rotation. Some claims additionally incorporate a current sensor producing an alert when motor current exceeds a threshold, where the alert can interrupt first-direction rotation and cause reversal until the home-position signal is received, followed by calibration of a motor zero position corresponding to the current cutting tip drive mechanism position.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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