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
  • A61F9/013—Instruments for compensation of ocular refraction ; Instruments for use in cornea removal, for reshaping or performing incisions in the cornea
  • A61F9/0133—Knives or scalpels specially adapted therefor
• • 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
  • A61F9/013—Instruments for compensation of ocular refraction ; Instruments for use in cornea removal, for reshaping or performing incisions in the cornea

Definitions

• Refractive ophthalmic surgery instruments include microkeratomes in which a cutting head comprises a cutting blade mounted to slide in a guide housing and animated in this housing with an alternating linear movement generated by the cooperation of the blade (or of a support which is integral with it) with a drive finger, generally mounted rotating eccentrically at the end of a motor shaft perpendicular to the direction of movement of the blade.
• This drive shaft is located at the end of a drive unit to which the keratome cutting head is removably attached.
• This finger projects into the slide housing of the blade in order to reach a slot in the blade (or its support) and to be lodged there.
• the housing provided in the head has a section taken perpendicular to the movement of the blade, substantially identical, apart from the operating clearance, to the section of the blade-support assembly which slides there. This housing is through and the blade is slid into it by one of its ends before the head is assembled with the power unit. It is only after mounting the head on the motor unit that the drive finger maintains the blade in this housing having entered the groove.
• the volume swept by the drive finger during its rotation is relatively narrow (the alternating stroke of the blade is of an amplitude of the order of a millimeter) so that the groove of the blade may not be in inter- section with this volume and, when the finger is rotated, the cooperation of the finger and the groove does not occur.
• the invention therefore relates to a set of cutting blade for microkeratome comprising a blade with a straight cutting wire, the blade being secured to a support whose profile is substantially constant along a parallel longitudinal dimension to the cutting line and is limited by an external surface comprising a notch substantially orthogonal to the cutting line, in which this external surface has a clearance parallel to the line of the blade, extending from one end of the support to a determined distance of the notch.
• the release- ment is formed by a longitudinal groove open at the end of the support.
• the obstacle placed in the housing for guiding the cutting assembly comes down to the end of a cylindrical rod. The cooperation of the longitudinal groove and the rod can produce additional guidance of the cutting blade assembly in its reciprocating movement.
• the clearance is formed by a leveling of the external surface of the support, one end of which on the side of the notch forms an embankment for connecting the external surface to the leveling.
• This embankment has the same functions as the end of the groove of the previous embodiment, the stop cooperating with this talus can be of any suitable shape.
• this stop Insofar as the stop integral with the cutting head and projecting inside the sliding housing of the blade assembly is mounted against a spring which tends to push it inside this housing, this stop also acts as a thrust member for the cutting blade assembly against a reference surface of the housing, thereby improving operating stability.
• the blade support has one end projecting beyond the cutting blade, the section of which gradually decreases. This end forms a point which, by its shape in the trunk of a pyramid, assists in the positioning of the assembly of cutting blades in the housing of the head.
• FIGS. 2 and 3 are two perspective views of two sets of cutting blades according to the invention.
• FIG. 4 is a sectional view of a cutting head equipped with the set of blades shown in FIG. 2.
• the cutting head shown in FIG. 1 consists of a one-piece body 1, known in itself, which can be, by means of a fixing end piece 2, screwed or more generally coupled to the end of a not shown drive member.
• This motor member in addition to corresponding connecting means for fixing the head 1, has at this connection end, a drive shaft of a cutting blade device which is slidably mounted in a housing 3 of the head 1 visible in FIG. 4.
• the axis of the drive shaft is referenced 4 in FIGS. 1 and 4. At its end, this shaft has a drive finger 5 eccentric with respect to the axis 4 .
• the head has a cylindrical bore 6 which allows it to be pivotally mounted around the axis of this bore on a pivot belonging to the fixing ring of the eye to be operated. During the operation, the head 1 rotates around the pivot in the direction noted A in FIG. 1.
• the head In front of the housing, still in known manner, the head has a plate 7 for applanation of the cornea, the wire cutting from the cutting blade being located behind and just slightly below the rear edge 7a of this plate.
• the housing 3 is a housing of longitudinal direction orthogonal to the axis 4 and of constant profile, produced right through in the body 1 of the head. chopped off.
• the cutting device that this housing is capable of receiving is shown in FIGS. 2 and 3.
• the cutting device comprises a blade proper 8 with a straight cutting wire 9, integral with a support 10 elongated in a longitudinal direction substantially parallel to the straight wire 9.
• the section of the support 10 is substantially constant (see its end 11 in the figures) and the fixing of the support to the blade is carried out in a known manner for example by a lower heel fitted into a corresponding opening made at the rear of the blade and not shown in the drawings.
• the support 10 has an outer surface 12 which in the case in question has an upper face 13. While in known manner the blade is disposed inclined downward and forward in the head 1, the face 13 is in the case in the figure shown, perpendicular to the axis 4. This face 13 has a groove 14 substantially orthogonal to the wire 9 of the blade, this groove being intended to receive the drive finger 5 of the motor assembly.
• the upper surface 13 has in FIG. 2 a second groove 15 open at 15a at the end of the support and having an end 15b on the side of the groove 14 situated at a determined distance from this groove.
• a rod 16 is forcibly mounted in the head 1 so that its lower end 16a protrudes inside the housing 3 in the direction of the upper face 13 of the support 10.
• the introduction of the cutting blade assembly into the housing 3 operates on the side 3a of this housing. This introduction is carried out before the head is coupled to the motor device.
• the assembly 8, 10 is introduced into the housing 3, it slides in the direction of the other end 3b thereof until it is stopped by the end 16a of the rod 16 which abuts against the end 15b of the groove 15.
• the groove 14 is in a position such that the drive finger 5, when the head is mounted on the power unit will necessarily fall into the groove 14 at most a maximum of half a turn of the axis 4.
• a groove 14 will be provided, the sides of which are slightly V-shaped so that, when the finger 5 is as close as possible to the rod 16, the end 15b of the groove 15 does not come to touch this rod. More precisely, the side of the groove 14 located opposite the end 15b of the groove 15 should be inclined downward, the width of the groove 15 being at the top greater than the diameter of the finger 5. Furthermore, the opposite side of the abrupt groove 14 will be distant from the end 15b by a value less than that of the smallest distance separating the finger 5 from the rod 16.
• FIG. 3 of the cutting blade assembly according to the invention differs from that of FIG. 2 only by a leveling 17 instead of the groove 15.
• This leveling is limited by an embankment or a step 18 by which it is connected to the face 13.
• the position of this slope 18 relative to the groove 14 is identical, for the same reasons, to the position of one end 15b of the groove 15.
• the rod 16 can be mounted in the head 1 to
• this rod which may have a rounded end or which may cooperate with a sloping groove bottom 15 or a leveling 17 equal - rising slope towards the groove 14, may be slightly raised when inserting the set of blades into the housing 3 and maintain a force for pressing this assembly against the lower surface of the housing 3. This pressing pressure can improve the stability of the blade during its reciprocating movement.
• the support 10 projects by one end beyond the blade 8.
• This projection constitutes an insertion and guide end of the blade assembly in the housing 3 and, to improve this introduction, it can be seen that the projecting end of the support 10 is in the form of a point 10a corresponding substantially to the end of a tetrahedron.
• the tip of the tetrahedron is located slightly inside the transverse profile of the support 10.

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)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8862418

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (6)

• 2001
  • 2001-04-18 FR FR0105228A patent/FR2823664B1/fr not_active Expired - Lifetime
• 2002
  • 2002-04-15 KR KR20037013641A patent/KR100577968B1/ko not_active IP Right Cessation
  • 2002-04-15 CN CNA02808327XA patent/CN1503651A/zh active Pending
  • 2002-04-15 EP EP02732827A patent/EP1379205A1/fr not_active Withdrawn
  • 2002-04-15 JP JP2002580849A patent/JP2004528895A/ja active Pending
  • 2002-04-15 WO PCT/FR2002/001296 patent/WO2002083042A1/fr not_active Application Discontinuation
  • 2002-04-15 CA CA 2445193 patent/CA2445193A1/fr not_active Abandoned
  • 2002-04-15 US US10/475,103 patent/US7175639B2/en not_active Expired - Lifetime

Non-Patent Citations (1)

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