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WO1996039983A1 - Dispositif orthodontique pour couper un fil metallique - Google Patents

Dispositif orthodontique pour couper un fil metallique Download PDF

Info

Publication number
WO1996039983A1
WO1996039983A1 PCT/US1996/009658 US9609658W WO9639983A1 WO 1996039983 A1 WO1996039983 A1 WO 1996039983A1 US 9609658 W US9609658 W US 9609658W WO 9639983 A1 WO9639983 A1 WO 9639983A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting edge
beak
jaw member
shear tooth
wire
Prior art date
Application number
PCT/US1996/009658
Other languages
English (en)
Inventor
Robert N Staley
Original Assignee
Staley, Robert, N.
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 Staley, Robert, N. filed Critical Staley, Robert, N.
Priority to AU63293/96A priority Critical patent/AU6329396A/en
Publication of WO1996039983A1 publication Critical patent/WO1996039983A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
    • A61C7/02—Tools for manipulating or working with an orthodontic appliance
    • A61C7/04—Tools for manipulating or working with an orthodontic appliance plier-type, e.g. pincers

Definitions

  • This invention relates generally to the field of plier-li e cutting tools, and more specifically to plier-like cutting tools used in orthodontic and dental operations.
  • Orthodontic techniques frequently require the use of wires to manipulate a patient's teeth into the desired position.
  • metal bands are fastened about certain of the patient's teeth. Attached to these bands are buccal tubes which are located adjacent to the patient's cheeks.
  • a wire is anchored within the patient's mouth by inserting it through a buccal tube, cutting the wire adjacent one end of the tube, and bending the cut end of the wire so that it cannot be withdrawn through the tube.
  • the anchored wire is then connected to clips mounted on the patient's other teeth.
  • the wire thereby exerts a force on the other teeth in order to move them into the desired position. Difficulties with the cutting and handling of the wire complicate the performance of this orthodontic technique.
  • the orthodontist must take care that the sharp ends of the wire, and the tools used to manipulate the wire, do not injure the patient's mouth.
  • the forces applied to the wire when it is cut tend to flatten the ends of the wire and give them sharp edges. This makes the cut wire difficult to insert and remove from buccal tubes and increases the chances of wire cuts and puncture wounds to the patient.
  • a wire-cutting tool should be designed to operate in this small area.
  • a cutter should be designed so that it will not encounter interference from the patient's cheeks, which may push on the cutter making it difficult to properly position the cutter or hold it steady.
  • the cutter disclosed in the Kurz patent operates in compressive fashion, whereby two cutting surfaces meet in opposition to "bite" the wire.
  • Other cutters may operate in shear fashion, whereby the cutting surfaces move adjacent to each other and shear the wire trapped between them.
  • the cutter disclosed in the Kurz patent is known as a "distal end" cutter.
  • the beak of the cutter wherein the cutting edges reside, is bent away from the major portion of the cutter jaws at an angle approximately perpendicular to the plane in which the cutting members rotate.
  • the jaws of the cutter may thus easily be positioned in the mouth adjacent and parallel to the patient's rear teeth, with the beak pointing towards the teeth and with the wire extending between the cutting surfaces.
  • This type of cutter is well suited for use within a patient's mouth because the cutting occurs within a small space. Since it cuts "around the corner" from the major portion of the cutter it does not encounter the interference with the patient's cheeks that a non-distal, "straight-end", cutter would.
  • the present invention provides a pliers-like wire cutting apparatus of a size convenient for use in a patient's mouth wherein the cutting apparatus retains the surplus end of the wire after cutting and wherein the main end of the wire adopts a rounded profile after cutting.
  • the rounded profile lessens the possibility that the patient's mouth may be cut or punctured by the cut end of the wire and it greatly facilitates the insertion and removal of the wire from buccal tubes.
  • a wire- cutting orthodontic pliers is comprised of two jaw members.
  • the two jaw members are preferably rotatably connected to each other at a pivot.
  • Each jaw member includes a cutting jaw end and a handle end.
  • the two cutting jaws may be brought together when the jaw members are actuated to rotate about the pivot by bringing the two handles together.
  • the entire cutter is of a size such that it may be easily manipulated within the patient's mouth.
  • One of the cutting jaws has a beak with a cutting edge and the other jaw has a beak with a shear tooth.
  • These beaks are preferably distally located in relation to the jaws to allow easier intra-oral cutting.
  • the cutting edge and shear tooth define non-linear complementary surfaces which operate in tandem to cut the wire.
  • the shear tooth forces the wire onto the cutting edge, thereby shearing the wire into a main end, which adopts a profile corresponding to the shape of the non-linear cutting edge, and a surplus end.
  • the non-linear profile is generally rounded in shape.
  • the cutting edge may have a concave parabolic profile, thereby producing a main end of the wire with a rounded profile.
  • shelves are located on each jaw adjacent to the cutting edge and the shear tooth. These shelves close upon the surplus end of the wire after it is sheared, thereby retaining the surplus end so that it may be removed from the mouth and properly disposed of.
  • a guidance shelf is preferably located adjacent to the shear tooth to aid in positioning the wire between the shear tooth and the cutting edge. When a wire abuts the guidance shelf and the shear tooth it rests entirely between the shear tooth and the cutting edge. An operator may thus use the guidance shelf to assure that the entirety of the main end of the wire will be cut by the cutting edge and shear tooth.
  • Fig. 1 shows a perspective view of the preferred embodiment of the cutter of the present invention.
  • Fig. 2 shows a perspective view of the cutting edge jaw of the cutter of the present invention.
  • Fig. 3 shows a perspective view of the shear tooth jaw of the cutter of the present invention.
  • Fig. 4 is a plan view of the cutting edge jaw of the cutter of the present invention as seen from between the jaws the cutter.
  • Fig. 5 is an elevation view of the cutting edge jaw of the cutter of the present invention.
  • Fig. 6 is a plan view of the shear tooth jaw of the cutter of the present invention as seen from between the jaws of the cutter.
  • Fig. 7 is an elevation view of the shear tooth jaw of the cutter of the present invention. DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 A preferred embodiment of a cutter in accordance with the present invention, indicated generally by the numeral 20, is shown in Fig. 1.
  • the cutter 20 includes two jaw members 22,24 which rotate about a pivot 26 when actuated by the force of a human hand on the handles 28,30.
  • the handles 28,30 may be provided with knurling, rubber sleeves, or other means for providing an improved gripping surface.
  • the jaw members 22,24 may be spring-loaded so that they will generally stay in an open position unless actuated to close. This is helpful for pliers-like inventions, which are generally easy to close by hand, but hard to open without the addition of finger loops or the like to the handles.
  • one handle 28 is a cutting edge jaw 32.
  • the other handle 30 is a shear tooth jaw 34.
  • the two jaws 32,34 are brought together when the handles 28,30 are actuated.
  • At the end of the cutting edge jaw 32 is a cutting edge beak 36.
  • At the end of the shear tooth jaw 34 is a shear tooth beak 38.
  • These two beaks 36,38 are preferably distally located from the jaws 32,34, extending from them at a substantially perpendicular angle.
  • These "distal end" type of cutters may be operated with minimum interference from a patient's cheeks.
  • the cutter 20 may be of non- distal end design, wherein the beaks 36,38 are generally parallel to the entirety of the jaw members 22,24. Such a cutter might, for example, be used for cutting wire outside of a patient's mouth, where the distal end design would not be of any significant advantage.
  • the cutting edge beak 36 is shown in detail in Fig. 2 (in perspective), Fig.4 (in plan view) and Fig 5. (in elevation view) .
  • the cutting edge beak 36 has a cutting edge beak surface 40, which includes a cutting edge shelf 42, a retaining shelf 44, and a complimentary guidance shelf 46.
  • the cutting edge shelf 42 has a cutting valley 48 which is defined by a non-linear cutting edge 50 on the cutting edge shelf 42 and a shear surface 52 which joins perpendicularly to the cutting edge shelf 42 at the cutting edge 50.
  • the shear tooth beak is shown in detail in Fig. 3 (in perspective) , Fig. 4 (in plan view) and Fig. 5 (in elevation view) .
  • the shear tooth beak 38 has a shear tooth beak surface 54, which includes a shear tooth beak shelf 56, a shear tooth shelf 58, and a guidance shelf 60.
  • a shear tooth 62 extends from the shear tooth shelf 58 out onto the shear tooth beak surface 54. The top of the shear tooth 62 is even with the top of the shear tooth beak shelf 58.
  • the shear tooth 62 and the cutting edge 50 provide the shearing force used to cut an orthodontic wire.
  • the shear tooth 62 forces the wire onto the cutting edge 50 and down the shear surface 52 as the handles 28,30 are actuated.
  • the parabolic, rather than straight, cutting edge 50 produces a cut wire with a rounded end instead of a straight end with sharp corners.
  • the cutting valley 48 should have a size slightly larger than the diameter of the wire. This allows the entire diameter of the wire to be cut by the cutting edge 50 and shear tooth 62 rather than by adjacent shearing surfaces which would deform the cut end and leave sharp edges.
  • the cutter 20 is inserted into the patient's mouth between the cheek and the teeth and adjacent to a wire, protruding from a buccal tube, which is to be cut.
  • the cutter 20 is positioned so that the wire rests between the cutting edge beak 36 and the shear tooth beak 38.
  • the handles 28,30 may then be actuated to bring the beaks together.
  • the wire is trapped between the shear tooth 62 and the cutting edge 50 and, as the shear tooth 62 begins to move within the cutting valley 48, shear forces cut the wire into a main end, and a surplus end which is to be discarded.
  • the main end of the wire which is the portion of the wire which remains protruding from the buccal tube, is rounded, rather than sharp-edged, due to the parabolic shape of the cutting edge.
  • the surplus end of the wire is grasped between the cutting edge shelf 42 and the shear tooth beak shelf 56, thereby preventing it from flying off and becoming lost in the patient's mouth as it separates from the main end.
  • the cutter 20 remains closed as it is withdrawn from the patients mouth. After the cutter 20 is withdrawn from the mouth the jaw members 22,24 may be opened to release the surplus end of the wire which may be discarded.
  • the beaks of the cutter 20 must be designed so that when an orthodontic wire is grasped between the cutting edge shelf 42 and the shear tooth beak shelf 56 the space ⁇ between the retaining shelf 44 and the shear tooth shelf 58 must be larger than the diameter of the wire. If this is not the case the main end of the wire will become pinched between the retaining shelf 44 and the shear tooth shelf 58 thereby deforming the main end, defeating the purpose of the invention, and making it impossible to withdraw the cutter 20 form the mouth without first opening the jaw members 22,24, thereby releasing the surplus end.
  • the rounded end of the main wire, produced by the parabolic cutting edge 50, is desirable because it is less sharp than a wire cut with a straight cutting edge and therefore will not irritate a patient's oral tissues to the same extent that a straight-cut wire would. It is also desirable because it is easier to insert and remove from buccal tubes.
  • a straight-cut wire may require substantial pushing or pulling to insert or remove it from a buccal tube. In addition to the discomfort which such pushing and pulling inflicts on a patient, a straight-cut wire might also be driven into the patient's oral tissues if it slips from the buccal tube when such pushing or pulling occurs.
  • the design of the cutter 20 may be modified so that the cutter 20 produces a main end of the wire with a sharp needle-like tip.
  • a cutter 20 would have a triangular cutting valley 48 with a V- shaped cutting edge 50, and a shear tooth 62 with a V-shaped profile rather than a parabolic one. The main end of the wire would become more sharp and needle-like as the angle of the V is made more acute.
  • Such a cutter 20 could be used to produce a needle-like main end of the wire, which could then be inserted through a buccal tube, and then a cutter 20 which produces a rounded cut could be used to cut the needle-like main end into a rounded main end.
  • a guidance shelf 60 is preferably provided to overcome this difficulty by providing a means whereby the wire may easily be aligned with the cutting edge.
  • the cutter 20 is preferably made of a sterilizable, corrosion-proof metal, such as stainless steel. Since the orthodontic wires to be cut are made of either stainless steel or nickel-titanium alloy, and have a very high tensile strength, the beaks 36,38 (or at least the cutting edge shelf 42 and the shear tooth 62) are preferably made of carbon alloy steel that will maintain a cutting edge after a long period of use.
  • the beaks 36, 38 might be formed of such a material and then attached to the jaws 32,34 by holding screws or other similar means, so that the entire cutter 20 need not be discarded when the cutting edge 50 grows dull.
  • the beaks 36,38 may simply be replaced with a new set.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

L'invention concerne un outil pour couper un fil métallique, du type pince, utile pour une utilisation orthodontique intra-buccale, le fil métallique étant coupé en un segment principal avec une extrémité arrondie et un segment excédentaire qui est retenu par la pince de manière à ne pas se perdre dans la bouche du patient. Des mâchoires (32, 34) pivotantes actionnées par des poignées (28, 30) fonctionnant à la manière de ciseaux, ont des becs (36, 38) partant des mâchoires sensiblement à la perpendiculaire. Un bec comprend un méplat saillant (42) avec une découpe interne (52) et un bord coupant non linéaire (50) à l'interface entre le méplat et la découpe. L'autre bec comprend un second méplat (58) et une dent saillante (62) qui coupe par cisaillement. Les deux becs sont complémentaires dans le sens que, quand les poignées sont actionnées pour rapprocher les mâchoires, la dent vient sur le fil métallique et le pousse sur le bord coupant pendant qu'elle glisse dans la découpe, ce qui provoque la coupure du fil métallique en un segment principal et en une extrémité excédentaire.
PCT/US1996/009658 1995-06-07 1996-06-07 Dispositif orthodontique pour couper un fil metallique WO1996039983A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63293/96A AU6329396A (en) 1995-06-07 1996-06-07 Orthodontic wire cutter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US48421795A 1995-06-07 1995-06-07
US8/484,217950607 1995-06-07

Publications (1)

Publication Number Publication Date
WO1996039983A1 true WO1996039983A1 (fr) 1996-12-19

Family

ID=23923236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/009658 WO1996039983A1 (fr) 1995-06-07 1996-06-07 Dispositif orthodontique pour couper un fil metallique

Country Status (2)

Country Link
AU (1) AU6329396A (fr)
WO (1) WO1996039983A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2371489A (en) * 2001-01-24 2002-07-31 Susan Marjorie Straw Orthodontic wire end catcher
US7257897B2 (en) 2002-11-22 2007-08-21 Ethicon, Inc. Trimmer for cutting a coiled strand
CN102462546A (zh) * 2011-03-24 2012-05-23 张国彬 口腔正畸平衡矫正器之附件固定去除钳
CN105395261A (zh) * 2015-11-24 2016-03-16 宁波爱优恩商贸有限公司 弓丝末端弯制钳
CN105455907A (zh) * 2015-11-24 2016-04-06 宁波爱优恩商贸有限公司 口腔正畸末端切断钳
CN109394357A (zh) * 2018-12-19 2019-03-01 董立岩 一种口腔科用正畸钳

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1060242A (en) * 1912-09-07 1913-04-29 Bernard Feldman Dental forceps.
US3804132A (en) * 1973-08-08 1974-04-16 Mann H Inc Bow forming plier
US5007312A (en) * 1990-01-11 1991-04-16 Bailey Carey G Wrench for metal tubing connectors
US5084935A (en) * 1990-02-27 1992-02-04 Orbis-Werk Groten Gmbh & Co. Kg Multiple-purpose wire shaping and cutting tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1060242A (en) * 1912-09-07 1913-04-29 Bernard Feldman Dental forceps.
US3804132A (en) * 1973-08-08 1974-04-16 Mann H Inc Bow forming plier
US5007312A (en) * 1990-01-11 1991-04-16 Bailey Carey G Wrench for metal tubing connectors
US5084935A (en) * 1990-02-27 1992-02-04 Orbis-Werk Groten Gmbh & Co. Kg Multiple-purpose wire shaping and cutting tool

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2371489A (en) * 2001-01-24 2002-07-31 Susan Marjorie Straw Orthodontic wire end catcher
US7257897B2 (en) 2002-11-22 2007-08-21 Ethicon, Inc. Trimmer for cutting a coiled strand
CN102462546A (zh) * 2011-03-24 2012-05-23 张国彬 口腔正畸平衡矫正器之附件固定去除钳
CN102462546B (zh) * 2011-03-24 2014-05-28 张国彬 口腔正畸平衡矫正器之附件固定去除钳
CN105395261A (zh) * 2015-11-24 2016-03-16 宁波爱优恩商贸有限公司 弓丝末端弯制钳
CN105455907A (zh) * 2015-11-24 2016-04-06 宁波爱优恩商贸有限公司 口腔正畸末端切断钳
CN109394357A (zh) * 2018-12-19 2019-03-01 董立岩 一种口腔科用正畸钳

Also Published As

Publication number Publication date
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