WO2001019262A1 - Outil terminal moule par injection de metal en superalliage a base de cobalt destine a des instruments chirurgicaux, et instruments chirurgicaux incorporant cet outil - Google Patents

Outil terminal moule par injection de metal en superalliage a base de cobalt destine a des instruments chirurgicaux, et instruments chirurgicaux incorporant cet outil Download PDF

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Publication number
WO2001019262A1
WO2001019262A1 PCT/US2000/024467 US0024467W WO0119262A1 WO 2001019262 A1 WO2001019262 A1 WO 2001019262A1 US 0024467 W US0024467 W US 0024467W WO 0119262 A1 WO0119262 A1 WO 0119262A1
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WO
WIPO (PCT)
Prior art keywords
max
balance
trace amounts
incidental impurities
cobalt
Prior art date
Application number
PCT/US2000/024467
Other languages
English (en)
Inventor
John William Box
Gregory J. Murphy
Robert A. Breslauer
Original Assignee
Mark Two Engineering, Inc.
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 Mark Two Engineering, Inc. filed Critical Mark Two Engineering, Inc.
Priority to AU73527/00A priority Critical patent/AU7352700A/en
Publication of WO2001019262A1 publication Critical patent/WO2001019262A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties

Definitions

  • This invention broadly relates to surgical devices . More particularly, the invention relates to endoscopic and laparoscopic surgical instruments where the end effectors are uniformly comprised of a cobalt based alloy and are formed by metal injection molding.
  • endoscopic should be understood to suggest instruments and tools which are passed through small diameter openings and therefore inclusive of both endoscopic and laparoscopic instruments .
  • Minimally invasive surgical procedures include laparoscopic and endoscopic procedures .
  • Laparoscopic surgery typically involves making small incisions through the abdominal wall or chest cavity for viewing and/or operating on organs.
  • Endoscopic surgery involves inserting an endoscope through a body orifice and inserting tools through a lumen in the endoscope.
  • Trocars are typically utilized for creating the incisions.
  • Trocar tubes are left in place so that laparoscopic surgical tools may be inserted through the tube.
  • a camera or magnifying lens is often inserted through the largest diameter trocar tube (e.g. 10mm diameter) , while a cutter, dissector, or other surgical instrument is inserted through a similarly sized or smaller diameter trocar tube (e.g. 5 mm diameter) for purposes of manipulating and/or cutting the internal organ.
  • stainless steel parts such as precision end effectors for endoscopic tools
  • the stainless steel parts require finishing; i.e., buffing and polishing to remove imperfections.
  • stainless steel is a hard material as represented by standard indentation tests, it is subject to scratching, and the narrow grooves resulting from scratching are disadvantageously the site of potential contamination.
  • a further disadvantage of stainless steel end effectors is that they tend to break or nick upon the inadvertent cutting of surgical staples .
  • U.S. Patents Number 5,234,453 and Number 5,531,755 disclose investment cast cobalt base alloy endoscopic scissor elements . While investment cast cobalt base alloy end effectors are an improvement over the prior stainless steel and bronze end effectors, they do have some disadvantages. The investment casting process wastes a certain amount of material. Moreover, investment cast articles do not possess the same high density and mechanical properties of wrought articles of similar composition. SUMMARY OF THE INVENTION
  • end effectors for endoscopic surgical instruments are provided in the form of metal injection molded cobalt superalloy elements. It has been discovered that the metal injection molding (MIM) process can be used with cobalt superalloy materials to economically produce end effectors having the superior properties of wrought alloys. Moreover, the MIM process utilizes nearly 100% of the material and therefore incurs little waste.
  • MIM metal injection molding
  • the preferred composition for MIM cobalt superalloy end effectors is 19-30% Cr, 0-35% Ni, 35-62% Co, 0-10% Mo, 0-15% W, 0-3% Ti, 0-.6% Nb, 0-9% Fe, .4-.6% C, 0-7.7% Ta, 0-4.5% Al
  • cobalt base alloys are suitable. Additional preferred elements include silicon, boron, magnesium, and nitrogen. Other preferred aspects include the use of 38% or more cobalt in the alloy, and preferably 50% or more. Regardless of the exact composition, the cobalt base alloy is preferably sufficiently hard to scratch even the hardest stainless steel and to resist damage from titanium or stainless steel clips or staples.
  • Figure 1 is a side elevation view, partly in section, of an endoscopic surgical instrument incorporating MIM cobalt superalloy end effectors according to the invention.
  • an endoscopic (laparoscopic) surgical instrument is indicated at 10.
  • the endoscopic surgical instrument 10 broadly comprises an aluminum tube 15 surrounded by a peripheral insulating shrink wrap layer of plastic 20, a clevis means 30, end effectors 40, actuating means 50, and a push rod 60.
  • the clevis means 30 is preferably a separately formed aluminum piece which fixedly engages aluminum tube 15.
  • the clevis 30 also engages the end effectors 40 which are pivotally engaged to clevis 30 at pivot pin 45.
  • the end effectors 40 are formed by metal injection molding (MIM) cobalt superalloy.
  • MIM metal injection molding
  • the push rod 60 which is preferably formed of stainless steel, is coupled at its distal end 65 to the end effectors 40, and is connected at 70, at its proximal end to a manually operable actuating means 50.
  • the "distal end” of the instrument 10 or any part thereof is the end closest to the surgical site and distant from the surgeon, while the "proximal end” of the instrument 10 or any part thereof, is the end most proximate the surgeon and distant the surgical site.
  • the end effectors 90, 92 are typically each provided with a through hole 90a, 92a for coupling to the clevis 30 and a proximal offset tang (not shown) for coupling to the distal end 65 of the push rod 60.
  • one of the end effectors may be formed as an integral part of the clevis with only the other end effector being coupled to the push rod.
  • the end effectors of the surgical instrument of the invention are made from (MIM) cobalt superalloy.
  • the invention encompasses any and all different types of end effectors including cutters, graspers, dissectors, etc. All of the end effectors are of a relatively small size as they are intended to fit through a trocar tube or the lumen of an endoscope.
  • a fine cobalt superalloy powder is mixed with a binder including wax and polymers .
  • the mixture is preferably approximately 60% cobalt superalloy powder by volume.
  • This so-called “feedstock” is molded in a conventional injection molding machine suitable for plastic injection molding.
  • the injection molded feedstock known as “green parts”, are processed in two steps. First, the binder is removed from the green parts, either chemically or thermally. Second, after “debinding", the parts are heated (anywhere from 3 to 11 hours) in a dry hydrogen atmosphere at a temperature slightly below the melting point of the superalloy. During the heating process, the parts are sintered to near full density with values typically 96-98% of wrought material.
  • the preferred composition for MIM cobalt superalloy end effectors is 19-30% Cr, 0-35% Ni, 35-62% Co, 0-10% Mo, 0-15% W, 0-3% Ti, 0-.6% Nb, 0-9% Fe, .4-.6% C, 0-7.7% Ta, 0-4.5% Al by weight.
  • Superalloys contain a significant amount of chromium in addition to cobalt and are characterized by resistance to oxidation and hot corrosion.
  • Preferred alloy compositions for the end effectors of the present invention are cobalt base alloys containing at least about 38% by weight cobalt and more preferably at least about 50% by weight cobalt. A chromium content of about 20-30% by weight is preferred to ensure high long term corrosion resistance.
  • the cobalt base alloy metal injection molded end effectors of the present invention have a hardness such that the cutting edge of a cutting end effector according to the invention will scratch stainless steel leaving a minute groove but will not themselves be scratched by stainless steel or titanium.
  • the presently preferred cobalt base superalloy for practicing the invention is alloy ASTM F75 available from Ultrafine Powder Technology. In particular, an alloy having the following elements by weight is preferred:
  • Alloy F75 from Osprey an alloy having the following elements by weight :
  • Stellite 6 an alloy having the following elements by weight:
  • Stellite 12 an alloy having the following elements by weight :
  • Stellite 19 an alloy having the following elements by weight :
  • Stellite 190 an alloy having the following elements by weight :
  • Carpenter BioDur CCM an alloy having the following elements by weight :
  • cobalt base alloys other than those provided above can be utilized.
  • the primary requirement for the cobalt base alloy is that, regardless of composition, it should be sufficiently hard to scratch stainless steel.
  • a cobalt base alloy will comprise a cobalt base superalloy; i.e., it contains chromium.
  • additional preferred elements include carbon, silicon, and molybdenum.
  • the cobalt base alloy will include the use of 38% or more cobalt in the alloy, and typically 50% or more cobalt.
  • Other considerations in choosing a cobalt base alloy are that the alloy should be hard but not too brittle, and corrosion resistant. Of additional benefit is an alloy which when metal injection molded will not require additional machining.
  • the end effectors according to the invention have a length of less than .75 inches from the transverse through-hole to their distal end, a height less than .40 inches, and a thickness less than .20 inches.

Landscapes

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

Abstract

L'invention concerne des éléments (90, 92) d'outil terminal destinés à des instruments (10) de chirurgie endoscopique, se présentent sous la forme d'éléments moulés par injection de métal en alliage à base de cobalt. Cet alliage à base de cobalt et ces éléments d'outil terminal sont d'une composition homogène. Au moins un de ces éléments d'outil terminal possède un trou débouchant destiné à monter pivotant cet élément sur une chape (30). L'alliage à base de cobalt préféré est un superalliage à base de cobalt contenant au moins 38 % de cobalt, et de préférence 50 % ou plus.
PCT/US2000/024467 1999-09-14 2000-09-07 Outil terminal moule par injection de metal en superalliage a base de cobalt destine a des instruments chirurgicaux, et instruments chirurgicaux incorporant cet outil WO2001019262A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73527/00A AU7352700A (en) 1999-09-14 2000-09-07 Metal injection molded cobalt superalloy end effectors for surgical instruments and surgical instruments incorporating same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39668999A 1999-09-14 1999-09-14
US09/396,689 1999-09-14

Publications (1)

Publication Number Publication Date
WO2001019262A1 true WO2001019262A1 (fr) 2001-03-22

Family

ID=23568253

Family Applications (1)

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PCT/US2000/024467 WO2001019262A1 (fr) 1999-09-14 2000-09-07 Outil terminal moule par injection de metal en superalliage a base de cobalt destine a des instruments chirurgicaux, et instruments chirurgicaux incorporant cet outil

Country Status (2)

Country Link
AU (1) AU7352700A (fr)
WO (1) WO2001019262A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054970A2 (fr) * 2000-12-18 2002-07-18 Dentsply International Inc. Piece a main dentaire
DE102015009617A1 (de) * 2015-07-29 2017-02-02 Olympus Winter & Ibe Gmbh Chirurgisches Schaftinstrument

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836850A (en) * 1986-09-08 1989-06-06 Gte Products Corporation Iron group based and chromium based fine spherical particles
US5234453A (en) * 1990-05-10 1993-08-10 Symblosis Corporation Cobalt base alloy end effectors for laparoscopic surgical scissors
US5680894A (en) * 1996-10-23 1997-10-28 Lindberg Corporation Apparatus for the injection molding of a metal alloy: sub-ring concept
US5925039A (en) * 1996-06-12 1999-07-20 Iti Medical Technologies, Inc. Electrosurgical instrument with conductive ceramic or cermet and method of making same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836850A (en) * 1986-09-08 1989-06-06 Gte Products Corporation Iron group based and chromium based fine spherical particles
US5234453A (en) * 1990-05-10 1993-08-10 Symblosis Corporation Cobalt base alloy end effectors for laparoscopic surgical scissors
US5925039A (en) * 1996-06-12 1999-07-20 Iti Medical Technologies, Inc. Electrosurgical instrument with conductive ceramic or cermet and method of making same
US5680894A (en) * 1996-10-23 1997-10-28 Lindberg Corporation Apparatus for the injection molding of a metal alloy: sub-ring concept

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054970A2 (fr) * 2000-12-18 2002-07-18 Dentsply International Inc. Piece a main dentaire
WO2002054970A3 (fr) * 2000-12-18 2003-02-20 Dentsply Int Inc Piece a main dentaire
DE102015009617A1 (de) * 2015-07-29 2017-02-02 Olympus Winter & Ibe Gmbh Chirurgisches Schaftinstrument

Also Published As

Publication number Publication date
AU7352700A (en) 2001-04-17

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