Surgical instrument
First Claim
1. A surgical instrument designed for cutting and removing intact an elongated strip of internal tissue greater in length than the width of the instrument cutting edge, said instrument comprising:
- (a) a hollow shaft with rounded sides having a central, longitudinal axis, a handle at the rear end thereof and, at the forward end, a generally parabolic-shaped cavity which forms a bowl;
(b) said bowl having closed sides, a closed forward wall, a closed bottom, and an open mouth such that the sides, forward wall and bottom form a continuous inner wall integral with the adjacent sides of said hollow shaft except for an opening in said bowl which communicates with the interior of said hollow shaft; and
,(c) further wherein said open mouth is defined by a generally U-shaped rim integral with the adjacent sides of said hollow shaft and said rim is sharpened so as to form a cutting blade having side cutting edges and a distal tip.
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Accused Products
Abstract
This invention relates to the design and application of a goniectomy instrument for the purpose of diagnostically and therapeutically removing tissue from the anterior chamber angle of the eye and for retrieving this tissue for further examination. The surgical instrument of this invention comprises in combination: a hollow, tapered shaft having a cutting edge at one end as an integral part thereof; a retractable stylet contained within the hollow interior of the tapered shaft; and an irrigation port running along the outside of the tapered shaft. This instrument is useful for excising tissue to relieve an obstruction blocking the outflow of aqueous humor from the eye as well as for providing specimens of the excised tissue for histopathological examination.
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Citations
24 Claims
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1. A surgical instrument designed for cutting and removing intact an elongated strip of internal tissue greater in length than the width of the instrument cutting edge, said instrument comprising:
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(a) a hollow shaft with rounded sides having a central, longitudinal axis, a handle at the rear end thereof and, at the forward end, a generally parabolic-shaped cavity which forms a bowl; (b) said bowl having closed sides, a closed forward wall, a closed bottom, and an open mouth such that the sides, forward wall and bottom form a continuous inner wall integral with the adjacent sides of said hollow shaft except for an opening in said bowl which communicates with the interior of said hollow shaft; and
,(c) further wherein said open mouth is defined by a generally U-shaped rim integral with the adjacent sides of said hollow shaft and said rim is sharpened so as to form a cutting blade having side cutting edges and a distal tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A surgical instrument of comprising:
- a tubular member having a central, longitudinal axis and a forwardly extending leading end having an open mouth, said open mouth being outwardly sloping at an acute angle with respect to the central, longitudinal axis of said tubular member and having sharpened cutting edges; and
, holding means slidably positioned within said tubular member, said holding means having a blunt front end for contacting and fixing without cutting an excised tissue segment within said tubular member. - View Dependent Claims (14, 15, 16, 17)
- a tubular member having a central, longitudinal axis and a forwardly extending leading end having an open mouth, said open mouth being outwardly sloping at an acute angle with respect to the central, longitudinal axis of said tubular member and having sharpened cutting edges; and
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18. In a surgical instrument designed for goniectomy surgery, the improvements which comprise:
- a hollow shaft having a handle at one end thereof and a parabolic cavity at the other end, said cavity having a sharpened rim which forms a U-shaped cutting edge integral with the sides of said shaft;
a soft-tipped stylet slidably positioned inside said hollow shaft; and
an irrigation port along the outside of said hollow shaft proximate to said cutting edge.
- a hollow shaft having a handle at one end thereof and a parabolic cavity at the other end, said cavity having a sharpened rim which forms a U-shaped cutting edge integral with the sides of said shaft;
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19. A method for performing goniectomy surgery on an eye and for retrieving an elongated excised tissue segment comprising the following steps:
- p1 (a) introducing into the anterior chamber of the eye through an incision a surgical instrument comprising a hollow shaft with rounded sides and a parabolic cavity at the forward end thereof, said cavity having sides and a bottom integral with the sides of said hollow shaft, and an open mouth having a sharpened rim which defines a generally U-shaped cutting edge, and an aperture in the bottom of said cavity, and a blunt-tipped stylet slidably positioned inside said hollow said shaft;
(b) excising an elongated tissue segment by drawing said cutting edge along the trabecular meshwork such that the end of the tissue segment is directed through said aperture in said cavity; (c) advancing said stylet such that the blunt tip engages said tissue segment and holds it securely against the inside of including tissue securing and removal means for securing and removing intact an elongated strip of internal tissue. - View Dependent Claims (20, 21)
- p1 (a) introducing into the anterior chamber of the eye through an incision a surgical instrument comprising a hollow shaft with rounded sides and a parabolic cavity at the forward end thereof, said cavity having sides and a bottom integral with the sides of said hollow shaft, and an open mouth having a sharpened rim which defines a generally U-shaped cutting edge, and an aperture in the bottom of said cavity, and a blunt-tipped stylet slidably positioned inside said hollow said shaft;
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22. A method for performing goniectomy surgery on an eye and for retrieving an elongated excised tissue segment comprising the following steps:
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(a) introducing into the anterior chamber of the eye through an incision a surgical instrument comprising;
a hollow shaft with rounded sides having a central, longitudinal axis, a handle at the rear end thereof and, at the forward end, a generally parabolic-shaped cavity which forms a bowl;
said bowl having closed sides, a closed forward wall, a closed bottom, and an open mouth such that the sides, forward wall and bottom form a continuous inner wall integral with the adjacent sides of said hollow shaft except for an opening in said bowl which communicates with the interior of said hollow shaft;
further wherein said open mouth is defined by a generally U-shaped rim integral with the adjacent sides of said hollow shaft and said rim is sharpened so as to form a cutting blade having side cutting edges and a distal tip; and
further including a sleeve slidably positioned along the outside of said hollow shaft;(b) excising an elongated tissue segment by drawing said cutting edge along a trabecular meshwork such that the end of the tissue segment is directed into the parabolic cavity and up the hollow shaft; (c) advancing said sleeve along the hollow shaft so as to enclose the parabolic cavity and the tissue segment contained therein; and
,(d) removing said surgical instrument from the eye together with said elongated tissue segment intact. - View Dependent Claims (23, 24)
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Specification