Apparatus for frameless stereotactic surgery
First Claim
1. A chuck for neurosurgical stereotactic procedures comprising a body, a body extension to firmly secure said body to the distal end of an articulated arm, the body having a quadrangular cross-section with opposite base faces and two opposite side faces, a cylindrical body cavity having a first, circular, cavity opening at one of said two base faces, a cover plate removably covering the other one of said two base faces and having a second, circular, cavity opening in register with said first cavity opening, said first and second, circular, cavity openings having a smaller diameter than the diameter of said cylindrical body cavity, a ball member having a diametral through bore, located in said body cavity with a sliding fit and free to rotate about its center, a ball tightening member carried by said body, and protruding from one of said side faces to clamp said ball member in a selected oriented position of its through bore, a sleeve extending within said through bore and firmly secured to said ball member, said sleeve having an externally threaded, longitudinally slit, free end portion protruding from said body through at least one of said cavity openings and a locking nut surrounding and threaded on said free end portion and having an interfering fit with said slit free end portion to clamp in a selected longitudinal position, a surgical instrument of a cross-sectional size and shape to have a sliding fit with the inside of said sleeve, whereby the precise orientation and the longitudinal position of said instrument relative to said body can be successively and independently effected by respectively actuating said ball tightening member and said locking nut.
1 Assignment
0 Petitions
Accused Products
Abstract
This apparatus comprises a rigid half circular headclamp, three fixation pins to firmly secure the clamp to the patient'"'"'s skull, a connector to firmly secure the clamp to a surgical table on which the patient rests, an articulate arm including clampable joints, secured to the headclamp in one of several possible positions and a double chuck secured to the distal end of the articulated arm. The double chuck has two ball collets arranged in side by side cavities in the chuck body, and two locking screws for each ball collet. A first locking screw releasably locks the ball collet in a selected orientation, a second separate locking screw releasably locks in an adjusted axial position an elongated instrument inserted through said collet. The first and second locking screws are actuated independently of each other. A computer guided probe and a large number of surgical instruments can be slidably inserted within the ball collets and locked in an adjusted axial position and in a selected orientation.
95 Citations
21 Claims
- 1. A chuck for neurosurgical stereotactic procedures comprising a body, a body extension to firmly secure said body to the distal end of an articulated arm, the body having a quadrangular cross-section with opposite base faces and two opposite side faces, a cylindrical body cavity having a first, circular, cavity opening at one of said two base faces, a cover plate removably covering the other one of said two base faces and having a second, circular, cavity opening in register with said first cavity opening, said first and second, circular, cavity openings having a smaller diameter than the diameter of said cylindrical body cavity, a ball member having a diametral through bore, located in said body cavity with a sliding fit and free to rotate about its center, a ball tightening member carried by said body, and protruding from one of said side faces to clamp said ball member in a selected oriented position of its through bore, a sleeve extending within said through bore and firmly secured to said ball member, said sleeve having an externally threaded, longitudinally slit, free end portion protruding from said body through at least one of said cavity openings and a locking nut surrounding and threaded on said free end portion and having an interfering fit with said slit free end portion to clamp in a selected longitudinal position, a surgical instrument of a cross-sectional size and shape to have a sliding fit with the inside of said sleeve, whereby the precise orientation and the longitudinal position of said instrument relative to said body can be successively and independently effected by respectively actuating said ball tightening member and said locking nut.
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8. A ruler for use during frameless stereotactic procedures comprising a body having first and second parallel end faces and a through bore normal to said end faces, a tubing fixed to said body and protruding from said first end face in a first direction, said tubing coaxial with and communicating with said through bore, a graduated ruler strip secured to said body and protruding from said second end face in a second direction opposite to said first direction, said strip having an edge parallel with and close to the axis of said through bore, said ruler calibrated to indicate the distance from said second end face of a selected point on a surgical instrument inserted within said through bore and within said tubing;
- said ruler for calculating the depth of penetration of a brain cannula to a predetermined distal target referenced to an entrance point on the skull.
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9. A device for stabilizing one end of an articulated arm relative to a patient during an operative procedure, the other end of said articulated arm is adapted for attachment to a clamp, the device comprising:
a body member adapted to be secured at the free end of the articulated arm, the body member having a pair of chucks, one of which is capable of releasably guiding a surgical instrument, the other of which is capable of releasably securing a stabilizing member against the patient, to thereby stabilize the free end of the articulated arm during the operative procedure. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for stabilizing one end of an articulated arm relative to a patient during an operative procedure, the other end of said articulated arm is adapted for attachment to a clamp, said method comprising the steps of:
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a) securing a stabilizing device to the free end of the articulated arm, the stabilizing device having a pair of chucks;
b) securing a stabilizing member to one of said pair of chucks for holding one end of said member against the patient; and
c) using the other of the chucks for guiding a surgical instrument during the operative procedure, wherein the free end of the articulated arm is stabilized during the operative procedure. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification