Intraocular surgical instrument
First Claim
Patent Images
1. An intraocular surgical instrument comprising:
- a handpiece,an elongated inner tube movably connected at a first end to said handpiece and having a first cutting edge at a second end,an elongated outer tube disposed about said inner tube, and connected at a first end to said handpiece, andsaid first cutting edge sliding across said second cutting edge when said inner tube is moved axially relative to said outer tube, andsaid inner and outer tubes defining a first clearance therebetween at a first rearward region, a second clearance therebetween at a second region adjacent to said cutting edges, said first and second clearances maintaining said cutting edges in a cutting relationship, and a third clearance, larger than said first and second clearances, at a third region between said first and second regions.
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Abstract
An intraocular surgical instrument includes an elongated inner tube that is axially movably connected at a first end to a handpiece, and comprises a cutting edge at a distal end. An elongated outer tube is disposed coaxially with the inner tube, is connected at a first end to the handpiece, and includes a cutting edge at a distal end. A first clearance is provided between the inner tube and the outer tube at a first rearward region and a second region adjacent to the cutting edges, such that the cutting edges are maintained in a cutting relationship. A second clearance, larger than the first clearance, is provided at a third region disposed between the first and second regions.
402 Citations
35 Claims
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1. An intraocular surgical instrument comprising:
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a handpiece, an elongated inner tube movably connected at a first end to said handpiece and having a first cutting edge at a second end, an elongated outer tube disposed about said inner tube, and connected at a first end to said handpiece, and said first cutting edge sliding across said second cutting edge when said inner tube is moved axially relative to said outer tube, and said inner and outer tubes defining a first clearance therebetween at a first rearward region, a second clearance therebetween at a second region adjacent to said cutting edges, said first and second clearances maintaining said cutting edges in a cutting relationship, and a third clearance, larger than said first and second clearances, at a third region between said first and second regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An intraocular surgical instrument comprising:
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a handpiece, an elongated inner tube movably connected at a first end to said handpiece and having a first cutting edge at a second end, an elongated outer tube disposed about said inner tube, and connected at a first end to said handpiece, said first cutting edge sliding across said second cutting edge when said inner tube is moved axially relative to said outer tube, said handpiece comprising a barrel, a front cap fitted into said barrel, said front cap defining an axial bore adapted to hold said outer tube and through which said inner tube passes, a rear cap fitted to said barrel and defining an axial bore through which said inner tube passes, a piston disposed between said front and rear caps and defining an axial bore through which said inner tube passes, a biasing means for urging said piston rearwardly towards said rear cap, and an exerting means for exerting a forwardly directed force on said piston greater than the rearwardly-urging force of said biasing means so as to move said piston forward towards said front cap. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An intraocular surgical instrument comprising:
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a handpiece having an interior wall, an elongated inner tube movably connected at a first end to said handpiece and having a first cutting edge at a second end, an elongated outer tube disposed about said inner tube, and connected at a first end to said handpiece, said first cutting edge sliding across said second cutting edge when said inner tube is moved axially relative to said outer tube, a guide means for preventing rotational movement of said inner tube relative to said outer tube, said guide means comprising a key disposed on said interior wall and a piston having a wall that defines a longitudinally disposed groove, said piston being connected to said inner tube and contained within said handpiece, and said piston being adapted to move axially such that said key moves within said groove. - View Dependent Claims (35)
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Specification