Patent US5372588A successfully refreshed from Google Patents.
US5372588A
Expired / Lapsed
US
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Trocar having blunt tip
Assignee: Individual
•
Filing: 1992-11-24
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Granted: 1994-12-13
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Expires: 2012-11-24
Abstract
Abstract A trocar has an elongated body with a frustro-conical end which terminates in a blunt tip. A plurality of blades are radially attached to a blade housing connected to the trocar body. In one embodiment the blade housing moves toward the trocar body in response to a force causing the blades to extend to a cutting position. When the force is removed the blades return to a retracted position.
Inventors
- 👤 Kevin Farley
- 👤 Daniel M. Gudeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3417; A61B17/3494; A61B17/3496; A61B17/3474; A61B2017/0046; A61B2017/00473; A61B2017/3454; A61B2017/3456; A61B2017/346
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
118 words
A trocar comprising: an elongated trocar body having a tapered portion at a distal end; a blade housing, arranged along about a longitudinal axis of said trocar body, having a base and a blunt tip, said base of said blade housing being arranged adjacent said distal end of said trocar body; a plurality of elongated blades arranged radially about said blade housing and having proximal and distal ends, said proximal ends being connected to said blade housing; means for connecting said blade housing and said trocar body in axially opposed movable alignment; means for urging a distal end of a blade radially outwardly by axial movement of said blade housing toward said tapered portion of said trocar body.
Claim 2
Dependent Claim
118 words
A trocar comprising: an elongated trocar body having a tapered portion at a distal end; a blade housing, arranged along about a longitudinal axis of said trocar body, having a base and a blunt tip, said base of said blade housing being arranged adjacent said distal end of said trocar body; a plurality of elongated blades arranged radially about said blade housing and having proximal and distal ends, said proximal ends being connected to said blade housing; means for connecting said blade housing and said trocar body in axially opposed movable alignment; means for urging a distal end of a blade radially outwardly by axial movement of said blade housing toward said tapered portion of said trocar body.
Claim 3
Dependent Claim
30 words
The trocar of claim 1 comprising means for urging said distal ends radially inwardly during axial movement of said blade housing away from said tapered portion of said trocar body.
Claim 4
Dependent Claim
29 words
The trocar of claim 1 wherein said trocar body comprises a longitudinal channel at its distal end along about said longitudinal axis, sized to receive said means for connecting.
Claim 5
Dependent Claim
19 words
The trocar of claim 2 comprising spring means arranged for urging a distal end of a blade radially inwardly.
Claim 6
Dependent Claim
13 words
The trocar of claim 1 wherein the blade housing is made of plastic.
Claim 7
Dependent Claim
23 words
The trocar of claim 1 comprising means arranged for urging said blade housing axially away from said distal end of said trocar body.
Claim 8
Dependent Claim
15 words
The trocar of claim 1 comprising a cannula into which the trocar body is fitted.
Claim 9
Dependent Claim
14 words
The trocar of claim 7 comprising at least one depth marking on the cannula.
Claim 10
Dependent Claim
15 words
The trocar of claim 7 wherein the cannula is color coded to indicate trocar size.
Claim 11
Dependent Claim
96 words
The trocar of claim 1 comprising: a first longitudinal channel, arranged within said blade housing along said longitudinal axis of said trocar body; a second longitudinal channel, arranged within said trocar body along said longitudinal axis of said trocar body, which is aligned with said first channel; a connecting rod, extending between said blade housing and said trocar body, arranged along said longitudinal axis of said trocar body and sized to be inserted into said first and second longitudinal channels; a spring encircling said connecting rod and fitted between said trocar body and said blade housing.
Claim 12
Dependent Claim
35 words
The trocar of claim 10 wherein said first longitudinal channel comprises an opening through said blunt tip of said blade housing and said connecting rod comprises a tip arranged to extend from said blade housing.
Claim 13
Dependent Claim
30 words
The trocar of claim 1 wherein said means for connecting comprises a circumferential groove and wherein a pin passes through a portion of said trocar body into said circumferential groove.
Claim 14
Dependent Claim
30 words
The trocar of claim 1 wherein said means for connecting comprises a transverse slot and wherein a pin passes through a portion of said trocar body into said transverse slot.
Claim 15
Dependent Claim
30 words
The trocar of claim 10 wherein said connecting rod comprises one of circumferential groove and transverse slot arranged to accept a pin passing through a portion of said trocar body.
Claim 16
Dependent Claim
88 words
The trocar of claim 1 wherein said means for connecting comprises connecting and transition rod means, and said distal end of said elongated trocar body comprises a longitudinal channel having a shoulder; said connecting rod means having a diameter sized for insertion within said longitudinal channel, said diameter being smaller than a diameter of said transition rod means; said connecting rod means comprising a spring coiled thereon having one end arranged to engage an end of said transition rod means and another end arranged to engage said shoulder.
Claim 17
Dependent Claim
16 words
The trocar of claim 1 wherein the trocar body is color coded to indicate trocar size.
Claim 18
Dependent Claim
76 words
In a trocar comprising an elongated body, sized to pass through a cannula, and a distal end comprising blades for cutting, the improvement comprising: said distal end comprising a blade housing having a blunt tip; said blade housing having a tapered surface extending longitudinally from said blunt tip, comprising a plurality of longitudinally extending, radially mounted elongated blades with cutting edges extending radially outwardly from said tapered surface and arranged set back from said blunt tip.
Claim 19
Dependent Claim
76 words
In a trocar comprising an elongated body, sized to pass through a cannula, and a distal end comprising blades for cutting, the improvement comprising: said distal end comprising a blade housing having a blunt tip; said blade housing having a tapered surface extending longitudinally from said blunt tip, comprising a plurality of longitudinally extending, radially mounted elongated blades with cutting edges extending radially outwardly from said tapered surface and arranged set back from said blunt tip.
Claim 20
Dependent Claim
16 words
The trocar of claim 17 wherein said blade housing is removably attached to said distal end.
Claim 21
Dependent Claim
31 words
The trocar of claim 18 wherein said blade housing comprises a threaded post which mounts, by means of mating threads, in a channel at said distal end of said elongated body.
Claim 22
Dependent Claim
21 words
The trocar of claim 17 wherein said elongated body comprises a longitudinal channel, having an opening thereto through said blunt tip.
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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) | 1997-12-12 | 1998-06-13 | 1998-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-12 | 2002-06-13 | 2002-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-12 | 2006-06-13 | 2006-12-13 | $7700.00 | Window Closed / Lapsed |