Abstract: A system and a method of cast molding toric contact lenses permits aligning first and second mold sections at multiple rotational positions. Each mold section includes a set of alignment features that engage with complementary alignment features on the other mold section.

Abstract: A system and a method of cast molding toric contact lenses permits aligning first and second mold sections at multiple rotational positions. Each mold section includes a set of alignment features that engage with complementary alignment features on the other mold section.

Abstract: A casting mold is provided for forming a biomedical device including an ophthalmic device such as a contact lens. The casting mold includes an anterior mold section and a posterior mold section, wherein one of the mold sections includes a plurality of radially extending ribs and the remaining mold section includes an annular shoulder for engaging an outer end of the ribs to define a mold cavity.

Abstract: A blade holder 16 includes a bottom surface 18 for attachment to a blade 30. A top surface 20 interfaces with a drive-pin 32 of a microkeratome 38. A drive slot 22 is formed in the top surface 20 for engagement with the drive-pin 32 for allowing oscillation of the blade holder 16. A plurality of steps 24 are formed in the top surface 20, and rise from the drive slot 22 toward at least one side 26 of the blade holder 16.

Abstract: A method is provided of forming a biomedical device in a casting mold which has an anterior mold section and a posterior mold section, wherein one of the mold sections includes a plurality of radially extending ribs and the remaining mold section includes an annular shoulder for engaging an outer end of the ribs to define a mold cavity. The method includes engaging the mold sections along a peripheral seal of the mold cavity and a plurality of circumferentially spaced contact points on a shoulder of one of the mold sections. Cured excess material bonds to the ribs of the one mold section and provides repeatable retention and location of the excess material after formation of the biomedical device.

Abstract: A microkeratome 10 for use in ophthalmic surgery includes a bar-link drive 20 connected to a cutting-head 36. A fixation ring 34 attaches to a patient's eye and is coupled to the bar-link drive 20 to the drive the cutting-head 36 at least partially across the fixation ring 34.

Abstract: A microkeratome 10 for use in ophthalmic surgery includes a bar-link drive 20 connected to a cutting-head 36. A fixation ring 34 attaches to a patient's eye and is coupled to the bar-link drive 20 to the drive the cutting-head 36 at least partially across the fixation ring 34.

Abstract: A microkeratome 10 for use in ophthalmic surgery includes a bar-link drive 20 connected to a cutting-head 36. A fixation ring 34 attaches to a patient's eye and is coupled to the bar-link drive 20 to the drive the cutting-head 36 at least partially across the fixation ring 34.

Abstract: A casting mold is provided for forming a biomedical device including an ophthalmic device such as a contact lens. The casting mold includes an anterior mold section and a posterior mold section, wherein one of the mold sections includes a plurality of radially extending ribs and the remaining mold section includes an annular shoulder for engaging an outer end of the ribs to define a mold cavity.

Abstract: A method is provided of forming a biomedical device in a casting mold which has an anterior mold section and a posterior mold section, wherein one of the mold sections includes a plurality of radially extending ribs and the remaining mold section includes an annular shoulder for engaging an outer end of the ribs to define a mold cavity. The method includes engaging the mold sections along a peripheral seal of the mold cavity and a plurality of circumferentially spaced contact points on a shoulder of one of the mold sections. Cured excess material bonds to the ribs of the one mold section and provides repeatable retention and location of the excess material after formation of the biomedical device.

Abstract: A blade holder 16 includes a bottom surface 18 for attachment to a blade 30. A top surface 20 interfaces with a drive-pin 32 of a microkeratome 38. A drive slot 22 is formed in the top surface 20 for engagement with the drive-pin 32 for allowing oscillation of the blade holder 16. A plurality of steps 24 are formed in the top surface 20, and rise from the drive slot 22 toward at least one side 26 of the blade holder 16.

Abstract: A cutting blade assembly 20 includes a ceramic blade 22 with a forward cutting edge 24. A lower portion 28 of a blade holder 26 is formed of ceramic and is integral to ceramic blade 22. An upper blade holder portion 30 is attached to the lower blade holder portion 28, such that the upper blade holder portion 30 is structured for engagement with a microkeratome oscillation mechanism 84.

Abstract: A cutting-head 46 for a microkeratome includes a slot 48 for holding a single-bevel cutting-blade assembly 20. The slot 48 is oriented so that the single-bevel cutting-blade assembly 20 will be positioned to have a shear-face angle 44 and a blade-edge point 32 approximately the same as those for a multi-beveled cutting-blade assembly.

Abstract: A cutting blade assembly 20 includes a ceramic blade 22 with a forward cutting edge 24. A lower portion 28 of a blade holder 26 is formed of ceramic and is integral to ceramic blade 22. An upper blade holder portion 30 is attached to the lower blade holder portion 28, such that the upper blade holder portion 30 is structured for engagement with a microkeratome oscillation mechanism 84.

Abstract: A microkeratome 10 for use in ophthalmic surgery includes a bar-link drive 20 connected to a cutting-head 36. A fixation ring 34 attaches to a patient's eye and is coupled to the bar-link drive 20 to the drive the cutting-head 36 at least partially across the fixation ring 34.

Abstract: A microkeratome cutting blade assembly 10 includes a cutting blade 12 and a blade holder 14 attached to the cutting blade 12. The cutting blade 12 is keyed to aid in ensuring that a cutting blade 12 top surface 24 abuts the blade holder 14 during manufacturing.

Abstract: A microkeratome cutting blade assembly 10 includes a cutting blade 12 attached to a blade holder 14. A blade extension 18 is controlled to within at least six (6) ten-thousandths of an inch of a tangent extension length.

Abstract: Method for removing unwanted excess material from a mold section is particularly adapted for removing a monomer ring adhered within a reservoir of a female mold section used to mold a contact lens. The invention involves piercing the monomer ring and rotating the piercing members (e.g., annularly spaced pins) relative to the mold section whereby the monomer ring is sheared from the mold section to which it was adhered while the molded lens is left intact in the mold section.

Abstract: Apparatus and method for edging an ophthalmic lens comprises a spindle on which a lens is removably positioned and set rotating to engage with a web of abrasive material which is secured at only one end thereof. The free end of the web is allowed to dangle and is also preferably set into an oscillating, vertical movement which edges both the anterior and posterior surfaces of the lens adjacent the lens periphery to thereby smooth the periphery of the lens.

Abstract: Apparatus and method for edging an ophthalmic lens comprises a spindle on which a lens is removably positioned and set rotating to engage with a web of abrasive material which is secured at only one end thereof. The free end of the web is allowed to dangle and is also preferably set into an oscillating, vertical movement which edges both the anterior and posterior surfaces of the lens adjacent the lens periphery to thereby smooth the periphery of the lens.