Trephine instrument for use in cornea removal and transplant

Claim 2

A trephine instrument for use in surgical removal of a cornea comprising: elongate handle means for gripping by a surgeon with both hands when in use including first and second handle portions having their longitudinal axes laterally spaced and longitudinally offset from one another, said first and second handle portions being joined together by an interconnecting portion; guide means mounted on said first handle means portion including a concave end face dimensioned for seating against a cornea; blade means having an annular cutting edge mounted on said guide means and extending outwardly from said first handle portion; power-driven means operable for selectively imparting cutting motion to said blade means; and shifting means mounted on said handle means selectively operable for extending and retracting said blade means relative to said handle means.

Claim 3

The instrument of claim 1 wherein said guide means and said blade means are both cylindrical, said blade means being coaxially mounted on said guide means, said guide means including an elongate bore extending axially therethrough from said concave end face to the opposite end for connection to a vacuum producing source, said power-driven means including a rotatable shaft operatively interconnected to said blade means for imparting rotational motion thereto.

Claim 4

The instrument of claim 2 including arm means operatively interconnected between said shaft and said blade means for transferring rotational motion from said shaft to said blade means.

Claim 5

The instrument of claim 3 including cam means mounted on said shaft, said arm means having one end thereof connected to said cam means.

Claim 6

The instrument of claim 1 wherein said blade means includes a projecting member extending outwardly therefrom for engaging said shifting means.

Claim 7

The instrument of claim 5 wherein said shifting means includes a operable actuating element normally biased for retracting said cutting edge relative to the peripheral edge of said concave end face.

Claim 8

The instrument of claim 6 wherein said actuating element includes a portion for receiving said projecting member.

Claim 9

The instrument of claim 7 wherein said actuating element and said blade means extend outwardly from opposite sides of said first handle portion.

Claim 10

A trephine instrument for use in corneal removal comprising: elongate handle means for gripping by a surgeon with both hands when in use including first and second handle portions having their longitudinal axes laterally spaced and longitudinally offset from one another, said first and second handle portions being joined together by an interconnecting portion; cylindrical guide means mounted on said handle including a concave end face dimensioned for seating against a cornea; cylindrical blade means slidably and rotatably received on said guide means having an annular cutting edge, said blade means being detachably and coaxially mounted on said guide means; power actuated means mounted on said handle operable for selectively imparting cutting motion to said blade means; and shifting means including an actuating member mounted on said handle means selectively operable for extending and retracting said blade means relative to said handle means, said shifting means also including retaining members connected to said actuating member and releasably connected to said blade means.

Claim 11

A trephine instrument for use in corneal removal comprising: elongate handle means for gripping by a surgeon with both hands when in use including first and second handle portions having their longitudinal axes laterally spaced and longitudinally offset from one another, said first and second handle portions being joined together by an interconnecting portion; cylindrical guide means mounted on said handle including a concave end face dimensioned for seating against a cornea; cylindrical blade means slidably and rotatably received on said guide means having an annular cutting edge, said blade means being detachably and coaxially mounted on said guide means; power actuated means mounted on said handle operable for selectively imparting cutting motion to said blade means; and shifting means including an actuating member mounted on said handle means selectively operable for extending and retracting said blade means relative to said handle means, said shifting means also including retaining members connected to said actuating member and releasably connected to said blade means.

Claim 12

The instrument of claim 9 further including limit means provided on said first handle portion selectively adjustable for permitting said retaining members to be separated from said blade means after said actuating member has been displaced a predetermined distance.

Claim 13

The instrument of claim 9 wherein said retaining members extend into said first handle portion.

Claim 14

The instrument of claim 9 wherein said power-actuated means includes ultrasonic means operable for selectively oscillating said blade means and imparting cutting motion thereto

Claim 15

A trephine instrument for use in corneal removal comprising: elongate handle means for gripping by a surgeon with both hands when in use; cylindrical blade means having an annular cutting edge, said blade means being detachably mounted on said handle; ultrasonic means mounted on said handle including a needle operable for contacting the outer surface of said blade means to thereby selectively impart cutting motion to said blade means; and shifting means mounted on said handle selectively operable for extending and retracting said blade means relative to said handle means, said shifting means being detachably connected to said blade means.

Claim 16

A trephine instrument for use in corneal removal comprising: elongate handle means for gripping by a surgeon with both hands when in use; cylindrical blade means having an annular cutting edge, said blade means being detachably mounted on said handle; ultrasonic means mounted on said handle including a needle operable for contacting the outer surface of said blade means to thereby selectively impart cutting motion to said blade means; and shifting means mounted on said handle selectively operable for extending and retracting said blade means relative to said handle means, said shifting means being detachably connected to said blade means.

Claim 17

The instrument of claim 13 wherein said handle means includes first and second handle portions having their longitudinal axes offset from each other, said first and second handle portions being joined together by an interconnecting portion.

Claim 18

The instrument of claim 14 wherein said shifting means includes retaining members releasably connected to said blade means.

Claim 19

The instrument of claim 15 wherein said retaining members extend into said first handle portion and are shiftable to extend said blade means to a position externally of said handle means.