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
  • 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
  • A61F2/14—Eye parts, e.g. lenses or corneal implants; Artificial eyes
  • A61F2/16—Intraocular lenses
  • A61F2/1602—Corrective lenses for use in addition to the natural lenses of the eyes or for pseudo-phakic eyes
  • A61F2/1605—Anterior chamber lenses for use in addition to the natural lenses of the eyes, e.g. iris fixated, iris floating
• • 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
  • A61F2/14—Eye parts, e.g. lenses or corneal implants; Artificial eyes
  • A61F2/16—Intraocular lenses
  • A61F2/1602—Corrective lenses for use in addition to the natural lenses of the eyes or for pseudo-phakic eyes

Definitions

• Intraocular lens Intraocular lens
• the ametropia requires a diverging lens, this is designed as a plano-concave or biconcave intraocular lens.
• the lens also has a feel, i.e. Supporting or fastening elements with which the position of the lens is fixed in the anterior chamber.
• haptics e.g. curved spring legs used to support the intraocular lens in the chamber angle or clamping elements to clamp the intraocular lens in the periphery of the iris.
• the state of the art is W091 / 07147, in which a plano-concave intraocular lens is described, which is implanted in the anterior chamber of the eye and serves as a diffusing lens. The natural eye lens is not removed.
• plano-concave or biconcave anterior chamber lenses are much thicker at their edges than in the middle and therefore run counter to the natural geometry within the eye.
• the thick edge of the intraocular lens is therefore very close to the front inner wall of the eye, so that there can be touches that permanently cloud the cornea.
• the invention is based on the object of specifying an implantable intraocular lens which, in the implanted state, acts as a diverging lens, but which, in contrast to normal diverging lenses, is thinner at the edge than at the center.
• a lens material with a refractive index which is smaller than that of the aqueous humor is thus used.
• a lens of this type is therefore relatively thin at the edges and relatively thick in the middle, thus conforming to the natural shape of the eye in the anterior chamber area on. There is therefore no contact with the inner wall of the eye, so that clouding of the cornea is also avoided.
• fluorine-containing, transparent polymers in question e.g. Fluoropolymers which have a refractive index up to 1.295.
• fluorescent materials e.g. polytetrafluoroethylene (PTFE).
• FIG. 1 shows a partial cross section through an eye into which an intraocular lens according to the invention is inserted in addition to the existing natural eye lens;
• FIG. 2 shows several cross sections of intraocular lenses according to the invention; 3 to 5 representations of an intraocular lens according to a further embodiment of the invention.
• FIG. 1 shows a schematic partial cross section through a human eye with cornea 1, iris 2 and natural eye lens 3.
• the cavity of the eye is filled with water 4.
• a plan-convex intraocular lens is inserted into the anterior chamber, the material of the lens having a refractive index less than 1.336.
• the material is e.g. PTFE with a refractive index of 1.295.
• Fig. 2 several intraocular lenses made of a material with a refractive index n of 1.295 on a scale of 10: 1 are given, the refractive power or the diopter D -8, -6, -5 or -10. All lenses are thinner at the edges than in the middle.
• an intraocular lens 5 * is shown, the lens part 6 is concave / convex.
• the lens part 6 is integrated in a haptic 7, which is designed as a flat wing on both sides of the intraocular lens. 5, this intraocular lens 5 can be inserted between the natural eye lens 3 and the iris 2.
• the haptic 7 has a curvature corresponding to the normal curvature of the eye lens 3.

Landscapes

• Health & Medical Sciences (AREA)
• Ophthalmology & Optometry (AREA)
• Cardiology (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Transplantation (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Prostheses (AREA)
• Materials For Medical Uses (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6441009

Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (1)

Citations (7)

Family Cites Families (5)

• 1991
  • 1991-09-19 DE DE19914131229 patent/DE4131229C1/de not_active Expired - Fee Related
• 1992
  • 1992-09-10 WO PCT/DE1992/000768 patent/WO1993005732A1/de active Application Filing

Patent Citations (7)

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