US4373263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded implant removal knife
Assignee: Eli Lilly and Co
•
Filing: 1980-12-17
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Granted: 1983-02-15
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Expires: 2000-12-17
Abstract
Abstract Animal implantates may be removed by a knife that permits the insertion and removal of blades without the manipulation of fasteners. Such a knife may be inexpensively manufactured by molding two relatively simple pieces that can be fitted together to hold a scalpel blade and to permit its incision to be guided and limited in depth. One piece of such a knife forms a handle having a first portion adapted to be gripped by hand and a blade-carrying second portion forming two ribs with a central slot. The second piece is a blade carrier having a first side surface adapted to engage an opening in a blade to hold the blade in fixed position on the blade carrier. The blade carrier has an upper bearing surface adapted to engage a rib of the first handle portion and a surface projecting upwardly centrally of the bearing surface and being adapted to engage the ribs of the first portion. The blade carrier is assembled to the handle by inserting its upwardly projecting portion into the central slot of the handle where it is fixedly retained. When assembled, the two pieces hold the blade in position for use.
Inventors
- 👤 Grover W. Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3209; A61B17/32093; A61B17/3211; A61B17/3213; A61D; A61D1/00; B; B26; B26B; B26B5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
388 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly at an obtuse angle to form an upper planar surface over the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion, said blade-carrying portion further including a flange depending downwardly from the planar surface and forming a straight lower edge intersecting the axis of the handle at an acute angle, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upwardly projecting surface having a thickness about equal to the width of the central slot in the blade-carrying portion of the first piece and having a snap rib, an interior surface shaped to engage the blade and a flange depending downwardly and parallel to the interior surface and forming a straight lower edge, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted into the central slot of the first piece, said snap rib having passed the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the snap rib above the planar surface and so that the lower edge of the downwardly depending flange of the second piece is parallel to the lower edge of the downwardly depending flange of the first piece and so that said lower edges form a pair of parallel edges spaced outwardly from the central web of the blade-carrying portion and interior surface of the second piece, and whereby upon assembly a blade may be retained between said two pieces and held at an obtuse angle with respect to said handle and at an acute angle with respect to the spaced lower edges of the downwardly depending flanges of the first and second pieces.
Claim 2
Dependent Claim
388 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly at an obtuse angle to form an upper planar surface over the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion, said blade-carrying portion further including a flange depending downwardly from the planar surface and forming a straight lower edge intersecting the axis of the handle at an acute angle, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upwardly projecting surface having a thickness about equal to the width of the central slot in the blade-carrying portion of the first piece and having a snap rib, an interior surface shaped to engage the blade and a flange depending downwardly and parallel to the interior surface and forming a straight lower edge, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted into the central slot of the first piece, said snap rib having passed the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the snap rib above the planar surface and so that the lower edge of the downwardly depending flange of the second piece is parallel to the lower edge of the downwardly depending flange of the first piece and so that said lower edges form a pair of parallel edges spaced outwardly from the central web of the blade-carrying portion and interior surface of the second piece, and whereby upon assembly a blade may be retained between said two pieces and held at an obtuse angle with respect to said handle and at an acute angle with respect to the spaced lower edges of the downwardly depending flanges of the first and second pieces.
Claim 3
Dependent Claim
326 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly into the blade-carrying portion and forming an upper planar surface of the blade-carrying portion and inner surfaces partially surrounding the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion and forming one of the inner surfaces, partially surrounding the blade-carrying portion, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upper portion shaped to mate the partially surrounding inner surface of the blade-carrying portion and of the first piece, a surface projecting upwardly from the upper portion with a thickness and shape to engage the central slot in the blade-carrying portion of the first piece and an interior surface shaped to engage the blade, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted in the central slot of the first piece and engaged by the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the upper portion of the second piece in contact with the one partially surrounding inner surface of the blade-carrying portion of the first piece, and whereby upon assembly a blade may be held between said two pieces with the partially surrounding inner surface of the blade-carrying portion of the first piece transmitting force to the assembled second piece and the blade.
Claim 4
Dependent Claim
326 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly into the blade-carrying portion and forming an upper planar surface of the blade-carrying portion and inner surfaces partially surrounding the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion and forming one of the inner surfaces, partially surrounding the blade-carrying portion, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upper portion shaped to mate the partially surrounding inner surface of the blade-carrying portion and of the first piece, a surface projecting upwardly from the upper portion with a thickness and shape to engage the central slot in the blade-carrying portion of the first piece and an interior surface shaped to engage the blade, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted in the central slot of the first piece and engaged by the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the upper portion of the second piece in contact with the one partially surrounding inner surface of the blade-carrying portion of the first piece, and whereby upon assembly a blade may be held between said two pieces with the partially surrounding inner surface of the blade-carrying portion of the first piece transmitting force to the assembled second piece and the blade.
Claim 5
Dependent Claim
458 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly at an obtuse angle and forming an upper planar surface of the blade-carrying portion and inner surface partially surrounding the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion, said blade-carrying portion further including a flange depending downwardly from the planar surface and forming a straight lower edge intersecting the axis of the handle at an acute angle, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upper portion shaped to mate the one partially surrounding inner surface of the blade-carrying portion of the first piece, an upwardly projecting surface having a thickness about equal to the width of the central slot in the blade-carrying portion of the first piece and having a snap rib, an interior surface shaped to engage the blade, and a flange depending downwardly and parallel to the interior surface and forming a straight lower edge, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted into the central slot of the first piece, said snap rib having passed the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the snap rib above the planar surface and with the upper portion of the second piece mating the one partially surrounding inner surface of the blade-carrying portion of the first piece and so that the lower edge of the downwardly depending flange of the second piece is parallel to the lower edge of the downwardly depending flange of the first piece and so that said lower edges form a pair of parallel edges spaced outwardly from the central web of the blade-carrying portion and interior surface of the second piece, and whereby upon assembly a blade may be held between said two pieces and engaged by the central web of the first piece and the interior surface of the second piece and held at an obtuse angle with respect to said handle and at an acute angle with respect to the spaced lower edges of the downwardly depending flanges of the first and second pieces.
Claim 6
Dependent Claim
458 words
An implant removal knife including two pieces adapted for manufacture by molding and for assembly without fasteners, comprising a molded unitary first piece forming a handle portion and an integral blade-carrying portion extending forwardly from the handle portion at an obtuse angle, said handle portion and blade-carrying portion including a central web and a pair of ribs, said pair of ribs extending outwardly on each side of the central web at the periphery of the handle portion and extending forwardly at an obtuse angle and forming an upper planar surface of the blade-carrying portion and inner surface partially surrounding the blade-carrying portion, one of the ribs at one side of the central web portion of the blade-carrying portion having a central slot to provide a resilient rib portion, said blade-carrying portion further including a flange depending downwardly from the planar surface and forming a straight lower edge intersecting the axis of the handle at an acute angle, and a molded second piece engaging the blade when assembled to the first piece, said second piece including an upper portion shaped to mate the one partially surrounding inner surface of the blade-carrying portion of the first piece, an upwardly projecting surface having a thickness about equal to the width of the central slot in the blade-carrying portion of the first piece and having a snap rib, an interior surface shaped to engage the blade, and a flange depending downwardly and parallel to the interior surface and forming a straight lower edge, said second piece being assembled to said first piece with upwardly extending surface of the second piece inserted into the central slot of the first piece, said snap rib having passed the resilient rib portion of the first piece so that the resilient rib portion retains the second piece to the first piece with the snap rib above the planar surface and with the upper portion of the second piece mating the one partially surrounding inner surface of the blade-carrying portion of the first piece and so that the lower edge of the downwardly depending flange of the second piece is parallel to the lower edge of the downwardly depending flange of the first piece and so that said lower edges form a pair of parallel edges spaced outwardly from the central web of the blade-carrying portion and interior surface of the second piece, and whereby upon assembly a blade may be held between said two pieces and engaged by the central web of the first piece and the interior surface of the second piece and held at an obtuse angle with respect to said handle and at an acute angle with respect to the spaced lower edges of the downwardly depending flanges of the first and second pieces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |