Rotational drive apparatus with ratcheting mechanism
A hand-held, hand-operated apparatus for rotating, or spinning, rotatably oscillating and/or inducing back and forth longitudinal movement in a device, such as an elongated medical device. A drive shaft of the hand-held, hand-operated rotational drive apparatus includes a ratcheting mechanism capable of enabling oscillating (repeated forward and reverse) rotation of a device that has been coupled thereto when there is little or no resistance on the rotated device, and of enabling an actuator to return to a position that will enable further forward, or driving, rotation of the drive shaft and the rotated device when resistance on the rotated device prevents the rotated device and the drive shaft from rotating in a reverse direction.
1. A rooter, comprising:
a rotatable element; and
an actuator for causing the rotatable element to rotate, the actuator including:
a distal member capable of sliding over the rotatable element without driving rotation of the rotatable element, the distal member including engagement features at a proximal side thereof; and
a proximal member capable of driving rotation of the rotatable element in a first direction, the proximal member including engagement features at a distal side thereof,
the engagement features of the distal member capable of engaging the engagement features of the proximal member as the distal member is forced proximally to hold the proximal member rotationally stationary and to enable the proximal member to engage the rotatable element in a manner that drives rotation of the rotatable element in the first direction,
the engagement features of the proximal member capable of engaging the engagement features of the distal member in a manner that holds the proximal member rotationally stationary relative to the rotatable element when the rotatable element is capable of rotating in a second direction opposite from the first direction to enable movement of the proximal member distally along the rotatable element to drive rotation of the rotatable element in the second direction,
the engagement features of the proximal member capable of disengaging the engagement features of the distal member to enable the proximal member to rotate about the rotatable element when the rotatable element is not capable of rotating in the second direction to enable the proximal member to rotate about the rotatable element as the proximal member moves distally along the rotatable element;
a moveable element of a handle coupled to the distal member of the actuator and capable of forcing the distal member proximally over the rotatable element and causing the engagement features of the distal member to engage the engagement features of the proximal member to hold the proximal member rotationally stationary while forcing the proximal member proximally over the rotatable element to drive rotation of the rotatable element in the first direction; and
a biasing member capable of biasing the proximal member distally.
2. The rooter of claim 1 , wherein the engagement features of the distal member of the actuator and the engagement features of the proximal member of the actuator comprise cooperating teeth.
3. The rooter of claim 2 , wherein:
teeth of the distal member of the actuator are arranged in a circle on a proximal end of the distal member; and
teeth of the proximal member of the actuator are arranged in a circle on a distal end of the proximal member.
4. The rooter of claim 3 , wherein each tooth of the cooperating teeth includes:
a drive surface oriented radially to hold the proximal member of the actuator rotationally stationary when the distal member forces the proximal member proximally along the rotatable element to drive rotation of the rotatable element in the first direction; and
a slip surface tapering outward from a base of the drive surface to enable the teeth of the proximal member to disengage the teeth of the distal member to enable rotation of the proximal member about the rotatable element and movement of the proximal member distally along the rotatable element when the rotatable element resists rotation in the second direction.
5. The rooter of claim 1 , wherein the biasing member comprises a coiled spring with:
a distal end abutting a proximal end of the proximal member of the actuator,
an intermediate portion surrounding a portion of the rotatable element located proximal to the proximal end of the proximal member, and
a proximal end held at a fixed location.
6. The rooter of claim 1 , further comprising:
a housing carrying the rotatable element.
7. The rooter of claim 6 , wherein the housing and the distal member of the actuator cooperate in such a way as to prevent rotation of the distal member relative to the rotatable element, but to enable movement of the distal member along a length of the rotatable element and through a length of the housing.
8. A method for rotating an elongated medical device, comprising:
securing a proximal end of the elongated medical device to a coupling element of a manually operable rooter;
forcing a distal member of an actuator of the manually operable rooter proximally over a rotatable element of the manually operable rooter without allowing the distal member to rotate about the rotatable element and without the distal member rotationally driving the rotatable element;
causing the distal member of the actuator to engage a proximal member of the actuator of the manually operable rooter in a manner that prevents the proximal member from rotating relative to the rotatable element and enables to the proximal member to engage the rotatable element in a manner that drives rotation of the rotatable element and rotation of the elongated medical device in a first rotational direction;
releasing a proximally oriented force on the distal member of the actuator;
applying a distally oriented force to the proximal member of the actuator; and
upon releasing the proximally oriented force on the distal member of the actuator, maintaining engagement between the proximal member of the actuator and the distal member of the actuator if the elongated medical device can rotate in a second rotational direction opposite from the first rotational direction, holding the proximal member rotationally stationary relative to the rotatable element, and causing the proximal member to drive rotation of the rotatable element in the second rotational direction.
9. The method of claim 8 , further comprising:
upon releasing the proximally oriented force on the distal member of the actuator, disengaging the proximal member of the actuator from the distal member of the actuator if the elongated medical device resists rotation in a second rotational direction opposite from the first rotational direction, enabling the proximal member to rotate about the rotatable element and to move distally along the rotatable element.
10. The rooter of claim 1 , wherein the engagement features of the proximal member are capable of disengaging the engagement features of the distal member when the proximal element forces the distal element distally along the rotatable element and the rotatable element resists rotation in the second direction.
11. The rooter of claim 10 , wherein the engagement features of the proximal member and the engagement features of the distal member cannot disengage one another as the distal member forces the proximal member proximally along the rotatable element and causes the proximal member to drive rotation of the rotatable element in the first direction.