EP1221920A1 - Scalpel pneumatique - Google Patents

Scalpel pneumatique

Info

Publication number
EP1221920A1
EP1221920A1 EP00978102A EP00978102A EP1221920A1 EP 1221920 A1 EP1221920 A1 EP 1221920A1 EP 00978102 A EP00978102 A EP 00978102A EP 00978102 A EP00978102 A EP 00978102A EP 1221920 A1 EP1221920 A1 EP 1221920A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
cutting
frequency
pulse
cutter according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00978102A
Other languages
German (de)
English (en)
Inventor
Gerrit Jan Vijfvinkel
Paulus Teygeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dutch Ophthalmic Research Center International BV DORC
Original Assignee
Dutch Ophthalmic Research Center International BV DORC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dutch Ophthalmic Research Center International BV DORC filed Critical Dutch Ophthalmic Research Center International BV DORC
Publication of EP1221920A1 publication Critical patent/EP1221920A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
    • A61F9/00763—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments with rotating or reciprocating cutting elements, e.g. concentric cutting needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00137—Details of operation mode
    • A61B2017/00154—Details of operation mode pulsed
    • A61B2017/00181—Means for setting or varying the pulse energy
    • A61B2017/0019—Means for setting or varying the pulse width
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00137—Details of operation mode
    • A61B2017/00154—Details of operation mode pulsed
    • A61B2017/00194—Means for setting or varying the repetition rate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00535—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated
    • A61B2017/00544—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated pneumatically

Definitions

  • the invention relates to a surgical cutter according to the preamble of claim 1.
  • US 5,630,827 Such a surgical cutter is known from US 5,630,827 and is applied for cutting eye tissue.
  • US 5,630,827 describes a pneumatic cutter with a compressed air supply which is provided with a frequency control for controlling the pulse frequency in which the compressed air pulses are supplied to the drive. From the passage in column 4, lines 42 - 49, it appears that only a clock circuit 721 is present. It is not described that the amount of energy supplied per compressed air pulse can be reduced with increasing pulse frequency.
  • US 4,940,468 also describes a pneumatic cutter provided with a compressed air supply whose pulse frequency can be controlled. Fig. 12 merely shows that the pulse frequency can be controlled, not that the amount of energy supplied per compressed air pulse can be controlled.
  • US 4,838,259 describes a respiratory support device provided with control means for modulating, depending on a pulse frequency, the width of an air pulse to be delivered by a compressed air valve. US 4,838,259 does not describe that such a device can be applied to reduce the energy supplied per compressed air pulse at a higher pulse frequency in order to compensate for an amount of compressed air energy still present in a compressed air cylinder of a pneumatic drive of surgical cutting tools.
  • the cutting member comprises a knife arranged to be movable along a cutting opening.
  • a drive designed as a pneumatic operating cylinder
  • the knife is driven along the cutting opening in a reciprocating manner.
  • the pneumatic drive is furnished with compressed air pulses by means of a compressed air supply.
  • the compressed air supply comprises a compressed air hose, connectable to a compressed air source, which, via an electromagnetically controllable compressed air valve, is furnished with compressed air pulses which are supplied to the drive.
  • the compressed air pulses then effect an outward stroke of the plunger of the operating cylinder, whereby the knife is driven to close off the cutting opening.
  • a return stroke of the compressed air cylinder, and consequently the opening of the cutting opening, is realized by means of a spring acting on the plunger.
  • the compressed air pressure in the chamber of the operating cylinder is released through a valve to the outside air or the compressed air hose.
  • the pulse frequency in which the compressed air pulses are supplied to the drive can be set with the help of a frequency control.
  • the cutting frequency can be controlled depending on the desired cutting speed. Particularly when cutting delicate tissue, such as eye tissue, it is important that a sufficiently high cutting frequency can be realized. Furthermore, it is important that the cutting frequency be adjustable, and preferably continuously variable, from a low cutting frequency up to the high cutting frequency.
  • a drawback of the known pneumatic cutter is that the maximum cutting frequency is not sufficiently high.
  • the maximum cutting frequency of the known pneumatic cutter is limited to about 800 cutting movements per minute. Above this cutting frequency, the plunger in the known device is found not to return to the initial position, and the cutting opening remains closed.
  • the object of the invention is to provide a cutter of the type mentioned in the preamble, with which, while maintaining its advantages, the drawbacks mentioned are avoided.
  • the cutter according to the invention is characterized by the features of claim 1. What is thus achieved is that in an elegant manner a considerably higher maximum cutting frequency can be realized.
  • the maximum cutting frequency can be considerably increased, for instance to at least 1,200 cutting movements per minute.
  • the invention is based on the insight that, with the known cutter, during the return stroke of the plunger an air pressure is built up in the chamber of the operating cylinder and that, at higher pulse frequencies, this pressure has not yet been enabled to be discharged from the chamber.
  • the known cutter can no longer return to the opened position.
  • By presently reducing the energy supplied per compressed air pulse at higher pulse frequencies it is achieved that compensation is possible for the compressed air energy still present in the cylinder, so that, during the return stroke, the piston can indeed return to the initial position through spring action.
  • the amount of compressed air energy supplied with each pulse is controlled by modulation means which modulate the width of the compressed air pulse, i.e. the pulse time, depending on the pulse frequency.
  • the control means comprise a microprocessor.
  • a further advantageous embodiment further comprises means for measuring the compressed air pressure in the cylinder and/or supply line, in particular during the return stroke of the compressed air cylinder.
  • the compressed air supply for supplying the compressed air in pulses comprises at least two compressed air supply valves, preferably arranged parallel, which are operated in opposite phase. What is achieved in this manner is that the pulse frequency can be increased in an elegant manner; in the known cutter, even a cutting frequency of 2,000 cutting movements per minute can be achieved.
  • the invention also relates to control means for reducing the energy of compressed air pulses with increasing pulse frequency. Further advantages of the invention are reflected in the subclaims.
  • Fig. 1 shows a schematic representation of the different parts of the surgical eye cutter
  • Fig. 2 shows a schematic cross section of the pneumatic drive and the cutting member
  • Fig. 3 shows an electronic diagram of a control for modulating the length of the compressed air pulses depending on the frequency. It is noted that the figures are only schematic representations of an exemplary embodiment. In the figures, identical or corresponding parts are designated by the same reference numerals.
  • Fig. 1 shows the different parts of the surgical eye cutter 1.
  • the eye cutter 1 comprises a cutting member 2 and a pneumatic drive 3 accommodated in a handle.
  • the cutter 1 further comprises a compressed air supply 4 for supplying compressed air in pulses to the drive 3, so that it can drive the cutting movement of the cutting member 2 at a cutting frequency.
  • the cutter 1 further comprises a frequency control 5 for controlling the frequency with which the compressed air pulses are supplied to the drive 3.
  • the cutter 1 comprises control means 6 for reducing, with increasing pulse frequency, the energy supplied to the drive with each compressed air pulse.
  • the control means are designed as a microprocessor 6.
  • Fig. 1 shows that the cutting member of the cutter 1 comprises a knife 8, arranged to be movable along a cutting opening 7.
  • the drive 3 is designed as a pneumatic operating cylinder 9 and will be further described hereinafter with reference to Fig. 2.
  • the compressed air supply 4 comprises a compressed air hose 11, connectable to a compressed air source 10, and which is furnished with compressed air pulses through an electromagnetically controllable compressed air valve 12, which pulses are fed to the drive 3.
  • the compressed air pulses then effect an outward stroke of the plunger 13 of the pneumatic operating cylinder 9 (Fig. 2).
  • the knife 8 is thereby driven to close off the cutting opening 7.
  • a return stroke of the operating cylinder 9, whereby the cutting opening 7 is opened, is accomplished by means of a spring 15 which acts on the plunger 13.
  • the cutter further comprises a frequency control 5 for controlling the pulse frequency in which the compressed air pulses are fed to the drive 3.
  • the frequency control 5 is designed as an electronic circuit which is coupled to the electromagnetically operable compressed air valve 12. With the help of the frequency control, the number of compressed air pulses delivered by the compressed air valve per unit time can be set, for instance from 1 to 1,500 pulses per minute. Such frequency controls are known to the skilled person and will therefore not be further elucidated here.
  • the pulse frequency in which the compressed air pulses are fed to the chamber 15 of the operating cylinder 9 can be set, so that the cutting frequency of the cutting member can be adjusted to the cutting speed with which the cutting member 2 is moved through the tissue to be cut.
  • the control means 6 designed as modulation means with increasing frequency of the pulses, the width of the individual pulses can be reduced.
  • An example of the modulation of the pulse width, depending on the pulse frequency, is, for instance, a linear decrease of the pulse width from 30 milliseconds to 8 milliseconds at a linearly increasing frequency from 1 to 1,350 cutting movements per minute.
  • the height of the pressure of the compressed air pulses then remains the same.
  • the pneumatic energy supplied to the chamber 15 per compressed air pulse can be compensated in a simple manner for the energy which, to an increasing extent with increasing cutting frequency, is left behind in the chamber, i.e. has not dissipated yet, during the return stroke of the plunger 13.
  • the modulation means comprise an electronic control. The constructional details of such a pulse width modulation control will be clear to the skilled person.
  • Fig. 3 it is shown how the frequency control 5 and the pulse width modulation means 6 can be integrated in a microprocessor 16.
  • the microprocessor 16 is coupled, via an analogue/digital converter 17, to a foot pedal 18 with which the desired cutting frequency can be set. Further, the microprocessor 16 can be coupled to a computer via a standard RS 232 input port 19, to program the desired relation between the increase of the frequency and the decrease of the pulse width.
  • the microprocessor 6 is connected via a buffer 20 to the electromagnetically operable compressed air valve 12.
  • the microprocessor 16 can further be coupled to pressure measuring means by which the air pressure present in the chamber 15 during the return stroke can be measured, so that, depending on the desired cutting frequency, the amount of compressed air energy supplied per compressed air pulse to the chamber 15 can be adjusted to the air pressure still present, in such a way that the return stroke of the plunger 13, under the action of the spring 14, can still be just realized and the knife 8 will still leave the cutting opening 7 just clear entirely.
  • the cutting member 2 can also be provided with several cutting openings 7'.
  • Fig. 1 shows that the cutter 1 is further equipped with a suction line 25.
  • Fig. 1 further shows that between the compressed air source 10 and the electromagnetically operable valve 12, a reducing valve 27 is arranged, for instance for reducing a pressure source pressure of 6 bar to a pressure of 2.6-3 bars to be applied to the valve 12.
  • a reducing valve 27 is arranged, for instance for reducing a pressure source pressure of 6 bar to a pressure of 2.6-3 bars to be applied to the valve 12.

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

L'invention porte sur un scalpel pneumatique servant en particulier pour des incisions dans l'oeil comprenant: un outil de coupe, un entraînement pneumatique produisant un mouvement de coupe à fréquence variable, une source d'air comprimé, et une commande de fréquence des impulsions d'air comprimé. Ladite commande, conçue pour réduire l'énergie des impulsions lorsque la fréquence croît, peut également comprendre un moyen de modulation de la largeur des impulsions.
EP00978102A 1999-10-22 2000-10-20 Scalpel pneumatique Withdrawn EP1221920A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1013376 1999-10-22
NL1013376A NL1013376C2 (nl) 1999-10-22 1999-10-22 Chirurgisch snijgereedschap.
PCT/NL2000/000766 WO2001030281A1 (fr) 1999-10-22 2000-10-20 Scalpel pneumatique

Publications (1)

Publication Number Publication Date
EP1221920A1 true EP1221920A1 (fr) 2002-07-17

Family

ID=19770118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00978102A Withdrawn EP1221920A1 (fr) 1999-10-22 2000-10-20 Scalpel pneumatique

Country Status (4)

Country Link
EP (1) EP1221920A1 (fr)
AU (1) AU1559401A (fr)
NL (1) NL1013376C2 (fr)
WO (1) WO2001030281A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4021141B2 (ja) 2000-10-20 2007-12-12 株式会社ニデック 硝子体手術装置
DE10158519B4 (de) * 2001-11-29 2005-01-13 Dornier Medtech Holding International Gmbh Stoß- und Druckwellen-Therapiegerät
DE102005037043C5 (de) 2005-08-05 2017-12-14 Dornier Medtech Systems Gmbh Stoßwellentherapiegerät mit Bildgewinnung
US8328835B2 (en) * 2008-12-08 2012-12-11 Bausch & Lomb Incorporated System for operating and controlling a pneumatically driven vitrectomy probe
ES2551581T3 (es) * 2009-08-31 2015-11-20 Alcon Research, Ltd. Control de salida de presión neumática por calibración de ciclo de servicio de válvula de accionamiento
US8666556B2 (en) 2009-12-10 2014-03-04 Alcon Research, Ltd. Systems and methods for dynamic feedforward
RU2556529C2 (ru) 2009-12-10 2015-07-10 Алькон Рисерч, Лтд. Система и способы для динамического привода пневматического клапана
GB2480232B (en) * 2010-05-05 2012-04-11 Arumugam Gunasegaran A blow-by gas energiser device
US8821524B2 (en) 2010-05-27 2014-09-02 Alcon Research, Ltd. Feedback control of on/off pneumatic actuators
US8808318B2 (en) 2011-02-28 2014-08-19 Alcon Research, Ltd. Surgical probe with increased fluid flow
US9060841B2 (en) 2011-08-31 2015-06-23 Alcon Research, Ltd. Enhanced flow vitrectomy probe
US10070990B2 (en) 2011-12-08 2018-09-11 Alcon Research, Ltd. Optimized pneumatic drive lines
US9629748B2 (en) * 2012-05-31 2017-04-25 Medical Instrument Development Laboratories, Inc. Multi-stage tubing for high-speed pneumatic surgical cutter
WO2013180718A1 (fr) * 2012-05-31 2013-12-05 Medical Instrument Development Laboratories, Inc. Tube multi-étages pour lame chirurgicale pneumatique à vitesse rapide
US9615969B2 (en) 2012-12-18 2017-04-11 Novartis Ag Multi-port vitrectomy probe with dual cutting edges
NL2010444C2 (nl) 2013-03-13 2014-09-16 D O R C Dutch Ophthalmic Res Ct International B V Oogchirurgisch snijgereedschap.
US9693898B2 (en) 2014-11-19 2017-07-04 Novartis Ag Double-acting vitreous probe with contoured port

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838259A (en) * 1986-01-27 1989-06-13 Advanced Pulmonary Technologies, Inc. Multi-frequency jet ventilation technique and apparatus
US4753234A (en) * 1986-11-03 1988-06-28 Miguel Martinez Surgical cutting instrument having a offset probe for ophthalmic surgery
US4940468A (en) * 1988-01-13 1990-07-10 Petillo Phillip J Apparatus for microsurgery
US5630827A (en) * 1995-06-19 1997-05-20 Dutch Ophthalmic Research Center International Bv Vitreous removing apparatus
WO1997046164A1 (fr) * 1996-06-07 1997-12-11 Scieran Technologies, Inc. Dispositif et procede a usage ophtalmique

Non-Patent Citations (1)

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Title
See references of WO0130281A1 *

Also Published As

Publication number Publication date
WO2001030281A1 (fr) 2001-05-03
AU1559401A (en) 2001-05-08
NL1013376C2 (nl) 2001-04-24

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