Steerable medical device handle
Embodiments of a steerable catheter control system and methods are disclosed. The steerable catheter control system comprises a housing which defines an inner housing and a slide assembly which linearly translates within the inner housing. At least two control wires are positioned through the slide assembly wherein one of the at least two controls wires are indirectly coupled to the slide assembly via the direction reversing element. The steerable catheter control system further comprises a slack limiting element, coupled to at least one of the at least two control wires. The slack limiting element allows for frictional engagement of the control wire to limit slack. The control system includes a control knob for linearly translating the slide assembly, enabling the slide assembly to manipulate the control wires which causes a change in deflection of the steerable catheter.
1. A steerable catheter control system for bi-directional control of a steerable catheter, the catheter comprising at least two control wires, a distal end of each of the control wires being coupled to the catheter at a distal region thereof, the control system comprising:
a housing coupled to the catheter, the housing defining an inner housing;
a slide assembly positioned within the inner housing and operable to translate linearly therein;
a proximal portion of the at least two control wires being positioned through the slide assembly;
wherein one of the at least two control wires is indirectly coupled to the slide assembly via a direction reversing element;
a slack limiting element having a first member and a second member positioned within the inner housing, both of the first member and the second member being coupled to a wire section of at least one of the at least two control wires, the first and second members aligned along a longitudinal axis of the slide assembly;
a first contact point formed between the first member and the wire section and a second contact point formed between the second member and the wire section;
wherein the first member and the second member are laterally offset from one another;
wherein the slack limiting element allows frictional engagement at the first and second contact points of to limit slack to a portion of the one of the at least two control wires; and,
a control knob rotatable around the longitudinal axis of the slide assembly and rotatably coupled to the housing for linearly translating the slide assembly, thereby enabling the slide assembly to manipulate each of the at least two control wires, effecting a change in deflection of said catheter.
2. The control system of claim 1 , wherein the slack limiting element comprises a serpentine friction device.
3. The control system of claim 2 , wherein the serpentine friction device comprises at least two pins forming the first and second members and extending perpendicular to a path of the one of the at least two control wires such that the at least one of the at least two control wires is positioned through spacing defined by the pins.
4. The control system of claim 3 , the serpentine friction device further comprising a top portion connected to a top portion of the pins such that the top portion define a gap for confining the at least one of the at least two control wires in the spacing defined by the pins.
5. The control system of claim 4 , wherein the serpentine friction device further comprising a base portion connected to a base portion of the pins.
6. The control system of claim 5 , wherein the pins are formed integrally with the top portion and the base portion.
7. The control system of claim 2 , wherein the serpentine friction device comprises ribs forming the first and second members which frictionally engage the at least one of the at least two control wires.
8. The control system of claim 7 , wherein the at least one of the at least two control wires is weaved through the ribs.
9. The control system of claim 1 , wherein the slack limiting element comprises a resilient friction device comprising an elastomer block forming the first and second members, wherein the elastomer block comprises a slit for receiving the at least one of the at least two control wires.
10. The control system of claim 1 , further comprising a height guide to maintain the position of the one of the at least two control wires along a plane of the direction reversing element.
11. The control system of claim 1 , further comprising a direction reversing element guide to trap the one of the at least two control wires around the direction reversing element.
12. The control system of claim 11 , wherein the direction reversing element is a pulley and the direction reversing element guide comprises a pulley guide.
13. The control system of claim 12 , wherein the pulley guide comprises a groove around the pulley.
14. The control system of claim 12 , wherein the pulley guide is adjacent to the pulley and at least partially surrounds a circumference of the pulley such that the one of the at least two control wires is positioned between the pulley and the pulley guide.
15. The control system of claim 14 , wherein the pulley guide further comprises projections extending inwardly from the pulley guide towards the pulley to control movement of the one of the at least two control wires positioned around the pulley.