Patent US4733671A successfully refreshed from Google Patents.
US4733671A
Expired / Lapsed
US
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Tissue needle
Assignee: Creative Research and Manufacturing Inc
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Filing: 1987-03-17
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Granted: 1988-03-29
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Expires: 2007-03-17
Abstract
Abstract Tissue needle for extracting a biopsy sample including a pistol style squeezable hand grip for single hand biopsy tissue needle operation. A spring tensioned sliding cannula, including a configured cutting edge, actuates by a squeeze trigger and cam arrangement to slide over a fixed position stylet for entry into a tissue sample area. A squeeze trigger manually cycles using one hand to obtain a biopsy sample contained in a tissue sample notch of the sharp stylet tip whereupon the tissue needle is manually withdrawn. The soft tissue can be liver tissue, kidney tissue, growth area tissue, or a like tissue. The tissue needle can have other medical biopsy uses in either human or animals.
Inventors
- 👤 Donald N. Mehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:12
CPC Classifications
A; A61; A61B; A61B10/00; A61B10/02; A61B10/0233; A61B10/0266; A61B10/0275
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
A tissue needle for extraction of biopsy tissue comprising: a. stationary stylet means affixed in a handle and including a sharp tip; b. movable cannula means extending into said handle, including a configured cutting edge, for sliding coaxially over and about said stylet means; c. means affixing said cannular means to a linkage bar pivotally mounted in said handle; d. actuator trigger bar means pivotally mounted in said handle and in cam engagement with said linkage bar; and, e. return compression spring positioned on said cannula and between the pivoting linkage arm and the handle.
Claim 2
Dependent Claim
95 words
A tissue needle for extraction of biopsy tissue comprising: a. stationary stylet means affixed in a handle and including a sharp tip; b. movable cannula means extending into said handle, including a configured cutting edge, for sliding coaxially over and about said stylet means; c. means affixing said cannular means to a linkage bar pivotally mounted in said handle; d. actuator trigger bar means pivotally mounted in said handle and in cam engagement with said linkage bar; and, e. return compression spring positioned on said cannula and between the pivoting linkage arm and the handle.
Claim 3
Dependent Claim
15 words
Tissue needle of claim 1 wherein said trigger bar means is a hand conforming grip.
Claim 4
Dependent Claim
48 words
Tissue needle of claim 1 wherein said stylet means is in a fixed relationship to said handle, and said cannula means slides co-axially over and about said stylet means including over and about a tissue sample notch at an end of said stylet means distal from said handle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |