ELECTRONICALLY ACTUATED RECIPROCATING SURGICAL INSTRUMENT
A handheld reciprocating surgical instrument may be an electronically actuated reciprocating surgical instrument. The actuation may be provided by a magnetic drive unit. The magnetic drive unit may be a voice coil actuator (VCA). The magnetic drive unit may include positional feedback to enable positional control of a cutter element. In this manner, port-based flow control may be used to more precisely control movement of the cutter element.
1 . A reciprocating surgical instrument for use in ophthalmic surgery, comprising:
a housing body;
a cutter extending from a distal end of the housing body, the cutter comprising a moveable cutter element;
a magnetic drive unit disposed in the housing body, the magnetic drive unit comprising:
a permanent magnet; and
at least one electromagnetic coil, one of the permanent magnet and the electromagnetic coil being fixed to the housing body and the other of the permanent magnet and the electromagnetic coils being fixed to the moveable cutter element and the magnetic drive unit operable to reciprocate of the moveable cutter element.
2 . The reciprocating surgical instrument of claim 1 , wherein the moveable cutter element is fixed to the permanent magnet and the electromagnetic coil is fixed to the housing body.
3 . The reciprocating surgical instrument of claim 1 , wherein the moveable cutter element is fixed to the electromagnetic coil and the permanent magnet is fixed to the housing body.
4 . The reciprocating surgical instrument of claim 1 , wherein the housing body forms a handle sized and shaped to be held in a hand of a user.
5 . The reciprocating surgical instrument of claim 1 , wherein the magnetic drive unit is operable to reciprocate the moveable cutter element at a rate within a range of 300 to 500 cycles per second.
6 . The reciprocating surgical instrument of claim 1 , wherein the magnetic drive unit comprises a voice coil actuator.
7 . The reciprocating surgical instrument of claim 1 , wherein electrical power is supplied to the at least one electromagnetic coil from an external power source.
8 . The reciprocating surgical instrument of claim 1 , wherein electrical power is supplied to the at least one electromagnetic coil from a battery disposed in the housing body.
9 . The reciprocating surgical instrument of claim 1 , wherein the cutter further comprises an outer cutter element, and wherein the inner cutter element is reciprocable within the outer cutter element.
10 . The reciprocating surgical instrument of claim 1 further comprising a positional sensor operable to detect a position of the movable cutter element relative to the housing body.
11 . A method for operating a reciprocating surgical instrument for use in ophthalmic surgery, the method comprising:
energizing an electromagnetic coil of a magnetic drive element disposed in a housing body of the reciprocating surgical instrument in an alternating manner;
displacing a magnet of the magnetic drive element relative to the electromagnetic coil in response to the energized electromagnetic coil, one of the electromagnetic coil and the magnet fixed to a movable cutter element and the other of the electromagnetic coil and the magnet fixed to the housing body; and
reciprocating the movable cutter element in response to the energizing the electromagnetic coil in the alternating manner.
12 . The method of claim 11 , wherein the reciprocating surgical instrument is a handheld surgical instrument.
13 . The method of claim 11 , wherein the reciprocating surgical instrument is a vitrectomy probe.
14 . The method of claim 11 , reciprocating the inner cutter element in response to the energizing the electromagnetic coil in the alternating manner comprises reciprocating the moveable cutter element at a rate within a range of 300 to 500 cycles per second.
15 . The method of claim 11 , wherein the magnetic drive unit comprises a voice coil actuator.
16 . The method of claim 11 , wherein electrical power for energizing the electromagnetic coil is supplied from an external power source.
17 . The method of claim 11 , wherein the electrical power for energizing the electromagnetic coil is supplied from a battery disposed within the housing body.
18 . The method of claim 11 , wherein the cutter element is a multi-cutter element.
19 . The method of claim 11 further comprising:
detecting a position of the moveable cutter element with a position sensor; and
controlling an amount of movement of the moveable cutter element relative to the housing body based on the detected position of the moveable cutter element.
20 . The method of claim 19 , wherein the reciprocating surgical instrument comprises an outer cutter element defining a port, the moveable cutter element moveable within the outer cutter element, and the method further comprising increasing or decreasing a size of the port by controlling a position of a distal end of the inner cutter element relative to the port.