Vitrectomy probe with a counterbalanced electromagnetic drive

Patent metadata

Field	Value
Publication number	US-2016120697-A1
Application number	US-201414526718-A
Country	US
Kind code	A1
Filing date	Oct 29, 2014
Priority date	Oct 29, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

According to one example, an ophthalmic surgical probe for treating an eye of a patient includes a body arranged for grasping by a surgeon and a cutting element extending distally from the body. The cutting element includes a sleeve member and an inner member disposed within the sleeve member, the inner member being movable axially with respect to the sleeve member. The probe also includes an actuating element configured to reciprocally move the inner member relative to the sleeve member. The actuating element includes a first coil secured within the body, a first magnet operatively secured to the inner member, and a second magnet that is not secured to the inner member, the second magnet being positioned and arranged to move in an opposite direction of the first magnet upon application of a voltage to the first coil.

First claim

What is claimed is:

1 . An ophthalmic surgical probe for treating an eye of a patient, the probe comprising:
a body arranged for grasping by a surgeon; a cutting element extending distally from the body including:
a sleeve member;
an inner member disposed within the sleeve member, the inner member being movable axially with respect to the sleeve member; and
an actuating element configured to reciprocally move the inner member relative to the sleeve member, the actuating element comprising:
a first coil secured within the body;
a first magnet operatively secured to the inner member; and
a second magnet that is not secured to the inner member, the second magnet being positioned and arranged to move in an opposite direction of the first magnet upon application of a voltage to the first coil.

2 . The probe of claim 1 , wherein the second magnet is unattached to the body.

3 . The probe of claim 1 , wherein the second magnet is attached to the body with a flex member.

4 . The probe of claim 1 , wherein the first magnet is a cylinder magnet secured to a proximal end of the inner member.

5 . The probe of claim 1 , wherein the second magnet is a ring magnet that concentrically circumscribes the first magnet.

6 . The probe of claim 1 , wherein the second magnet is a cylinder magnet in tandem with the first magnet.

7 . The probe of claim 1 , wherein the first magnet and the second magnet have substantially similar masses.

8 . The probe of claim 1 , further comprising a second coil that is wound similar to the first coil, the second coil being placed proximal to the first magnet.

9 . The probe of claim 1 , wherein the first coil is in electrical communication with a voltage supply that is configured to apply alternating voltages to the coil.

10 . The probe of claim 1 , further comprising a second coil that is placed proximal to the first magnet, wherein a voltage supply is configured to apply a first signal to the first coil and a second signal to the second coil such that one of:
the first signal and second signal are substantially coincident; or the first signal and second signal are opposite phase and have equal or opposite polarity.

11 . An ophthalmic surgical system comprising:
a probe including:
a body arranged for grasping by a surgeon;
a cutting element extending distally from the body including:
a sleeve member;
an inner member disposed within the sleeve member, the inner member being movable axially with respect to the sleeve member; and

an actuating element configured to reciprocally move the inner member with respect to the sleeve member, the actuating element comprising:
a first coil secured within the body and circumscribing the inner member;
a first magnet operatively secured to the inner member; and
a second magnet that is not secured to the inner member, the second magnet being positioned such that corresponding poles of the first magnet and the second magnet face opposite directions; and

a console that includes a voltage supply, the voltage supply being in electrical communication with the first coil.

12 . The system of claim 11 , wherein the first magnet is a cylinder magnet.

13 . The system of claim 11 , wherein the second magnet is a ring magnet that circumscribes the first magnet.

14 . The system of claim 11 , wherein the second magnet is in tandem with the first magnet.

15 . The system of claim 11 , wherein the first magnet and the second magnet have substantially similar masses such that application of the voltage to the coil causes the first magnet and the second manner to move in opposite directions with similar force.

16 . The system of claim 11 , wherein the sleeve member comprises a port at an end and the inner member is positioned such that reciprocal, axial movement of the inner member with respect to the sleeve member opens and closes the port.

17 . The system of claim 11 , wherein the voltage supply is configured to apply an alternating voltage to cause reciprocal motion of the inner member with respect to the sleeve member.

18 . A method for operating a vitrectomy probe, the method comprising:
applying a first voltage to a first coil within a body of the vitrectomy probe such that a first magnet is moved in a first direction and a second magnet is moved in a second direction that is opposite of the first direction, the first magnet being secured to an inner member positioned within a sleeve member such that reciprocal, axial movement of the inner member opens and closes a port at an end of the sleeve member; and applying a second voltage to the coil, the second voltage having a polarity that is opposite the first voltage, to cause the first magnet to move in the second direction and the second magnet to move in the first direction.

19 . The method of claim 18 , wherein the first magnet is substantially equal in mass to the second magnet and the first magnet and second magnet are positioned such that application of the voltage causes the second magnet to have a same force as the first magnet but in an opposite direction.

20 . The method of 18 , wherein the first voltage and second voltage are such that one of:
the first signal and second signal are substantially coincident; or the first signal and second signal are opposite phase and have equal or opposite polarity.

Assignees

• Novartis Ag

Inventors

• Farley Mark

Classifications

• A61B2017/00141

  continuous, e.g. wave · CPC title

• A61B2017/00398

  using powered actuators, e.g. stepper motors, solenoids · CPC title

• A61B17/32002

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B2017/00876

  magnetic · CPC title

• H02K33/16

  with polarised armatures moving in alternate directions by reversal or energisation of a single coil system · CPC title