Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
  • A61B17/17—Guides or aligning means for drills, mills, pins or wires
  • A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
  • A61B17/1742—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the hip
  • A61B17/175—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the hip for preparing the femur for hip prosthesis insertion
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
  • A61B17/8802—Equipment for handling bone cement or other fluid fillers
  • A61B17/8847—Equipment for handling bone cement or other fluid fillers for removing cement from a bone cavity
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/30721—Accessories
  • A61F2/30723—Plugs or restrictors for sealing a cement-receiving space
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/3094—Designing or manufacturing processes
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/3094—Designing or manufacturing processes
  • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/32—Joints for the hip
  • A61F2/36—Femoral heads ; Femoral endoprostheses
  • A61F2/3662—Femoral shafts
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
  • A61F2/4684—Trial or dummy prostheses
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30108—Shapes
  • A61F2002/30199—Three-dimensional shapes
  • A61F2002/30224—Three-dimensional shapes cylindrical
  • A61F2002/30235—Three-dimensional shapes cylindrical tubular, e.g. sleeves
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
  • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/30721—Accessories
  • A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
  • A61F2002/30726—Centering or guiding rods, e.g. for insertion of femoral shafts
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
  • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
  • A61F2002/30772—Apertures or holes, e.g. of circular cross section
  • A61F2002/30782—Apertures or holes, e.g. of circular cross section inclined obliquely
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/3094—Designing or manufacturing processes
  • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
  • A61F2002/30957—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. moulds
• • 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
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
  • A61F2/4657—Measuring instruments used for implanting artificial joints
  • A61F2002/4658—Measuring instruments used for implanting artificial joints for measuring dimensions, e.g. length
• • 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
  • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
  • A61F2230/0063—Three-dimensional shapes
  • A61F2230/0069—Three-dimensional shapes cylindrical

Definitions

• the present invention relates to a piercing part intended to be used in the context of an operation for removing a sheath of surgical cement, this sheath having been used for sealing a prosthesis of elongated shape in an elongated body cavity.
• the invention also relates to several methods of manufacturing this piercing part.
• the invention is in particular usable in the context of an operation for removing the cement sheath used for fixing a femoral stem of a hip prosthesis in the medullary canal of a femur.
• US Patent No. 5,047,035 describes a piercing part allowing such elimination.
• This part has a shape and dimensions corresponding generally to those of a femoral stem, and comprises a conduit arranged in it, parallel to its longitudinal axis. This conduit allows the drilling of a coaxial hole in the bone for the establishment of a spindle, this spindle being used to guide cannula reamers of increasing diameter, used to carry out the elimination of the sheath.
• the piercing part according to this prior document has the major drawback of making it possible to bore or perforate the femoral cortex. Indeed, it is very frequent that the longitudinal axis of the prosthesis, and therefore of the cement sheath, is oriented obliquely with respect to the axis of the femoral shaft. This oblique orientation leads to a corresponding orientation of said piercing part, and therefore of the duct, when this part is placed in the medullary canal of the bone, so that this duct directs the piercing tool in the direction of the cortex.
• the invention aims to remedy these problems.
• the piercing part which it relates has, in a manner known per se, a shape such that it can be engaged in the cavity delimited by the cement sheath after removal of the prosthesis, and comprises a conduit arranged in it, this conduit allowing the drilling of a hole for guiding or passing tools used to carry out the elimination of the sheath.
• - Said part comprises at least two mutually axially distant zones, shaped to bear tightly against the wall of the cement sheath;
• the axis of the conduit forms a non-zero angle with the longitudinal axis of the part, corresponding to the angle formed by the longitudinal axis of the cavity which the cement sheath delimits with the longitudinal axis of the body cavity, and
• the part can bear tightly against the wall of the cement sheath and allows precise positioning of the conduit relative to the body cavity.
• the conduit makes it possible to guide a drill intended to pierce the distal part of the cement in such a way that the drilling carried out coincides substantially with the longitudinal axis of the body cavity. This hole can then be used as a guide means for cement drilling operations.
• the entire part has a shape which corresponds to the shape of at least one elongated portion of the implanted prosthesis, to ensure perfect support of this piece against the wall of the cement sheath.
• the part is made of a block of rigid material, in particular of synthetic material, and the conduit is delimited by a tube of a material capable of withstanding the drill bit, in particular of metal.
• the entire piercing part can also be made of a material capable of resisting the piercing drill.
• a method of producing the piercing part according to the invention comprises the steps consisting in:
• the determination of these dimensions can be done by reading dimensions on images obtained by radiography or scanner, or simply by knowing the type and size of the implanted prosthesis.
• the determination of said orientation is done, for its part, from said images.
• Another method of producing the piercing part according to the invention comprises the steps consisting in:
• This process can be used during surgery when the type of prosthesis implanted remains unknown.
• a third method of producing the piercing part according to the invention comprises the steps consisting:
• this method further comprises the step consisting in placing, in the drilled conduit, a tube made of a material capable of withstanding the drill , especially in metal.
• FIG. 1 is a partial sectional view of the piercing part according to a first embodiment
• Figure 2 is a view of the upper end of a femur, in longitudinal section, with a medullary rod implanted therein
• Figure 3 is a view of the piercing part in use in this end
• Figure 4 is a view of a boring tool in use in this end
• Figure 5 is a view of the piercing part according to a second embodiment
• Figure 6 is a front view of a support for implementing a method of producing this piercing part, in which is placed a femoral hip prosthesis rod
• FIG. 7 is a side view of this support and of a container, during one phase of the process
• FIGS. 8 and 9 are views of this support during
• the upper end of the femur 2 comprises a femoral stem 3 of hip prosthesis fixed in the medullary canal 4 by means of a sheath of surgical cement 5.
• a spinal plug 6 of flexible material was placed in the channel 4 before placing the cement.
• This rod 3 must be replaced by another, more suitable rod, which implies the elimination of the sheath 5.
• the rod 3 is placed in varus, so that its longitudinal axis, and therefore the longitudinal axis of the sheath 5, is oriented obliquely relative to the axis of the femoral shaft 2a.
• the piercing part 10 shown in FIG. 1 comprises a metal tube 11, on a portion of which is molded an elongated cylindrical block 12 made of rigid material but easy to machine, in particular polyethylene.
• This determination of the dimensions of the rod 3 is made by reading dimensions on images obtained by radiography or scanner, or simply by knowing the type and size of the implanted rod 3, while the determination of said orientation is made from said images.
• the tube 11 is then oriented along a reference axis and is held in this position relative to this axis, and the block 12 is machined, depending on the dimensions and orientation of the prosthesis, to form the part 10 proper, capable of 'be used for the elimination of the sheath 5.
• the shape of this part 10 corresponds to said portion of the diaphyseal part 3a of the rod 3, and its orientation relative to the axis of the tube 11 corresponds to the orientation of the longitudinal axis of the sheath 5 relative to the axis of the diaphysis 2a.
• the piercing part 10 is engaged in the cavity of the sheath 5 so that its machined part 12 comes closely into contact with the cement.
• the axis of the tube 11 is then placed precisely coaxially with the axis of the diaphysis 2a and makes it possible to guide a drill 15 for drilling the distal part 5a of the sheath 5 and of the plug 6.
• the bore 16 produced (FIG. 4) is thus substantially coaxial with the longitudinal axis of the diaphysis 2a.
• This tool 20 comprises a rod 21 connected to a rotational drive means, a cutting head 22, for the bore of the cement, and, beyond this head 22, on the distal side, a cylindrical pin 23 intended to be engaged and to rotate in the hole 16.
• This tool 20 is part of a series of tools which are similar to each other, comprising cutting heads 22 whose diameter increases from one tool to another, to allow progressive boring. sheath 5, and pins 23 of suitable lengths.
• the cutting head 22 of a tool 20 may only include a cutting zone 22a on its distal part, its proximal part 22b being smooth, as shown in FIG. 4. This part 22b therefore does not attack the distal cement and keeps an axial guide to the head 22 by this cement when the zone 22a of this head reaches the plug 6.
• FIG. 5 shows a piercing part 30 which can be used in place of the part 10.
• This part 30 consists of an elongated block 32 of material molded or machined according to the shape of said diaphyseal portion 3a of the rod 3.
• this block 32 is drilled as a function of said orientation.
• this hole itself constitutes the conduit 31 for guiding the drill 15 or receives a tube made of a material capable of resisting the drill, in particular made of metal.
• Figures 6 to 9 illustrate different phases of implementation of a method of manufacturing the piercing part 10 comprising a tube 11, during surgical intervention and from the femoral stem 3 just removed from the 'bone.
• a support 40 comprising a main plate 41, in the upper end of which is arranged a vertical notch 42, and two parallel lower plates 43. These plates 43 are arranged opposite one on the other and located at a mutual distance such that the rod 3 can be placed between them.
• Plate 41 includes three transverse lights
• One of the two plates 43 comprises two slots 45 arranged at heights similar, but slightly different, from that of the slots 44, respectively.
• Rods 50 protruding between the plates 41 and 43 are engaged and can slide through these lights 44 and 45 and can be immobilized in a determined position of these lights 44 and 45.
• Each rod 50 comprises for this purpose a fixed flange 51, by which it bears against the internal face of the plate 41 or 43, a threaded portion 52 projecting beyond the external face of this plate 41 or 43, this portion 52 being intended to receive a mounting nut 53, and a portion of square cross section at the height of the plate 41 or 43, for its setting in rotation during the tightening or loosening of the nut 53.
• the plates 41, 43 include graduations 55 along the edges of the openings 44, 45, taking as their point of origin a vertical reference axis, passing substantially through the middle of the plates 41 and 43.
• the tube 11 can be mounted on the support 40 coaxially with said reference axis, by means of a plate 56 in which this tube 11 is held by engagement with gentle friction, this plate 56 comprising two screws 57 intended to be received in the notch 42.
• the distance of different points of the wall of the rod 3 relative to the diaphyseal axis is noted on radiographs, these points corresponding substantially to the heights of the rods 50 in the support 40.
• the rods 50 are then adjusted in their respective lights 44, 45 as a function of these positions, then the rod 3 extracted from the patient is placed in the support 40.
• the support 40 and the rod 3 are placed in a container 60 (FIG. 7) into which is poured a product capable of hardening, in particular a silicone product. Once this product has been taken (FIG. 8), the rod 3 is removed then the plate 56 is put in place, the tube 11, the distal end of which has been temporarily plugged, having come down until it comes into contact with the wall of the imprint 61 delimited by the block 62 of cast material (FIG. 9).
• the tool 20 could comprise a guide rod which can be engaged in the hole 16 and a tubular rod connected to its cutting head, this tubular rod being able to be engaged on this guide rod and to rotate relative to that -this.

Applications Claiming Priority (4)

Publications (1)

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ID=26233712

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (12)

• 1997
  • 1997-12-09 FR FR9715819A patent/FR2766358B3/fr not_active Expired - Fee Related
• 1998
  • 1998-07-23 WO PCT/FR1998/001635 patent/WO1999004734A1/fr active Application Filing

Patent Citations (12)

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