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EP-3691580-B1 - ELECTRONIC GUILLOTINE VITRECTOMY CUTTER

EP3691580B1EP 3691580 B1EP3691580 B1EP 3691580B1EP-3691580-B1

Inventors

  • STRAYER, Scott G.
  • HICKEY, LAUREN M.

Dates

Publication Date
20260506
Application Date
20180928

Claims (17)

  1. A vitrectomy apparatus, comprising: a vitrectomy hand piece (100) comprising a guillotine cutting device, the device comprising: a bobbin wound with one or more pieces of magnetic wiring (310) and affixed to an internal cutting shaft (318), the one or more pieces of magnetic wiring capable of generating a magnetic field in response to an applied voltage; and at least one magnet (308) located near the center of the guillotine cutting device; and at least one internal shell (312); wherein the bobbin moves forward and backward based on a difference in polarity of the magnet (308) in response to a generated magnetic field of voltage applied to the one or more pieces of magnetic wiring; and wherein the vitrectomy hand piece comprises a tube (202) communicatively connected to the internal cutting shaft (318) suitable for fluid flow through or around the apparatus; and. motion of the bobbin is bounded by one or more dampening materials (316).
  2. The vitrectomy apparatus of claim 1, wherein the one or more dampening materials comprise a spring, or optionally the one or more dampening materials comprise one or more of: silicone, rubber, foam, metal, or plastic.
  3. The vitrectomy apparatus of claim 1, wherein the bobbin assembly is wound with one or more pieces of magnetic wire.
  4. The vitrectomy apparatus of claim 1, wherein the bobbin assembly is affixed to the internal cutting shaft.
  5. The vitrectomy apparatus of claim 1, wherein the fluid flow comprises aspirated fluid from a surgical site.
  6. The vitrectomy apparatus of claim 1, wherein the at least one magnet (308) is affixed to the at least one internal shell (312), or the at least one magnet is affixed to the center of the bobbin.
  7. The vitrectomy apparatus of claim 1, wherein at least a portion of the bobbin is between the at least one magnet (308) and the at least one internal shell (312).
  8. The vitrectomy apparatus of claim 1, wherein the internal shell (312) is composed of a ferrous material, or optionally only a portion of the internal shell (504) comprises a ferrous material, or optionally the ferrous portion directs a portion of the magnetic field.
  9. The vitrectomy apparatus of claim 1, further comprising at least one heat sink.
  10. The vitrectomy apparatus of claim 1, wherein a portion of the one or more pieces of magnetic wiring provides for passive heat exchange.
  11. The vitrectomy apparatus of claim 1, wherein the shape of the magnet (308) enhances the magnetic field density of the generated magnetic field, or the shape of the shell (312) enhances the magnetic field density of the generated magnetic field, or the shape of the bobbin enhances the magnetic field density of the generated magnetic field.
  12. The vitrectomy apparatus of claim 1, wherein the internal cutting shaft (318) is at least partially encompassed by the at least one magnet (308).
  13. The vitrectomy apparatus of claim 1, wherein the tube (202) is communicatively connected to the internal cutting shaft (318) proximate to the bobbin, or the tube (202) is communicatively connected to the internal cutting shaft (318) proximate to a distal end of the handpiece.
  14. A method of controlling a guillotine cutting device, the device comprising: providing a bobbin wound with one or more pieces of magnetic wiring (310) and affixed to an internal cutting shaft (318), the one or more pieces of magnetic wiring capable of generating a magnetic field; providing at least one magnet (308) in communication with the bobbin; providing one or more dampening materials (316) for bounding motion of the bobbin; and generating at least one magnetic field from a provided voltage, wherein the bobbin moves forward and backward based on a difference in polarity of the magnet (308) in response to the magnetic field.
  15. The method of claim 14, wherein the at least one magnet (308) is affixed to the internal center of a shell (312) of the guillotine cutting device, or the provided voltage is pulsed, or the provided voltage is between 1 and 24 volts, or the provided voltage is between 1 and 5 volts.
  16. The method of claim 14, wherein the provided voltage controls the speed of the bobbin movement.
  17. The method of claim 14, further comprising providing at least one heat sink.

Description

Field of the Invention The present invention relates generally to the field of surgical hand pieces, and, more specifically, to vitrectomy surgical hand pieces for ocular surgical procedures. Background Certain surgical procedures, such as phacoemulsification surgery, have been successfully employed in the treatment of certain ocular problems, such as cataracts. Phacoemulsification surgery utilizes a small corneal incision to insert the tip of at least one phacoemulsification handheld surgical implement, or hand piece, through the corneal incision. The hand piece includes a needle which is ultrasonically driven once placed within the incision to emulsify the eye lens, or to break the cataract into small pieces. The broken cataract pieces or emulsified eye lens may subsequently be removed using the same hand piece, or another hand piece, in a controlled manner. The surgeon may then insert a lens implant into the eye through the incision. The incision is allowed to heal, and the result for the patient is typically significantly improved eyesight. As may be appreciated, the flow of fluid to and from a patient through a fluid infusion or extraction system, and thus the control of fluids and fluid pressure through the phacoemulsification hand piece, is critical to the procedure performed. Different medically recognized techniques have been utilized to control the fluid flow during the lens removal portion of the surgery. Among these, one popular technique is a simultaneous combination of phacoemulsification, irrigation and aspiration using a single hand piece. This method includes making the incision, inserting the handheld surgical implement to emulsify the cataract or eye lens, and, simultaneously with this emulsification, having the hand piece provide a fluid for irrigation of the emulsified lens using a sleeve that surrounds a needle and a vacuum for aspiration of the emulsified lens and inserted fluids. Currently available phacoemulsification systems, such as those mentioned above, typically include a variable speed peristaltic pump and/or vacuum pump, a vacuum sensor, an adjustable source of ultrasonic power, and a programmable microprocessor with operator-selected presets for controlling aspiration rate, vacuum and ultrasonic power levels. The phacoemulsification hand piece is interconnected with a control console by an electric cable for powering and controlling a piezoelectric transducer that drives the action of the hand piece. Tubing provides irrigation fluid to the eye through the hand piece and enables withdrawal of aspiration fluid from an eye through the hand piece. Generally, irrigation and aspiration are employed by the surgeon using the device to remove unwanted tissue and maintain pressure within the eye. Moreover, the use of, and particularly the pressurization of, the irrigation fluid is critical and may, for example, prevent the collapse of the eye during the removal of the emulsified lens. Irrigation fluid pressure is also used to protect the eye from the heat generated by the ultrasonic cutting needle and may suspend fragments created during the surgery in fluid for more easy removal through aspiration. Current phacoemulsification systems use either an electronic rotary vitrectomy cutter or a pneumatic driven vitrectomy cutter. Existing electronic rotary vitrectomy cutters use an oscillating cutting action which can result in an incomplete cut. This incomplete cut can pull vitreous material rather than cutting it. While a pneumatic vitrectomy requires a significant amount of hardware components, both in terms of cost and space, along with complex algorithms to ensure the system is providing sufficient pneumatic pressure to complete a cut. Based on the foregoing, it would be advantageous to provide a system that enables the combination of an electronic rotary vitrectomy cutter drive with the mechanical action of a pneumatic cutter. US4940468A discloses an apparatus for removing tissues such as vitreous humer from an eye has an outer needle having an aperture near one end; an inner tube disposed partially within the outer needle, having a sharp end and another end to which a vacuum is applied; a drive system for reciprocating the inner tube within the outer needle so that the sharp end of the inner tube reciprocates across the aperture to cut tissue; indexing means so that the inner tube does not rotate with respect to the outer needle; and venting means for releasing compressed air. US2015157503A1 discloses an ophthalmic surgical system for insertion into an eye of a patient includes a body and a cutting element having a sleeve piece secured to and extending distally from the body, the sleeve piece comprising a port at an end and an inner piece disposed within the sleeve piece, the inner piece being moveable axially with respect to the sleeve piece. US4428748A discloses a surgical system and apparatus which includes a handpiece with an ultrasonic motor for driving a needle or other instrum