WO1997034531B1 - Improved biopsy needle set - Google Patents
Improved biopsy needle setInfo
- Publication number
- WO1997034531B1 WO1997034531B1 PCT/US1997/004306 US9704306W WO9734531B1 WO 1997034531 B1 WO1997034531 B1 WO 1997034531B1 US 9704306 W US9704306 W US 9704306W WO 9734531 B1 WO9734531 B1 WO 9734531B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- needle
- cannula
- opening
- needle set
- longitudinal axis
- Prior art date
Links
- 238000001574 biopsy Methods 0.000 title claims abstract 4
- 238000000034 method Methods 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 2
Abstract
A biopsy needle set (10) comprises an outer cannula (1) and an inner cannula (2). The outer cannula (1) includes an outer opening (14), and the inner cannula (2) includes an inner opening (12). The inner cannula (2) is rotatable relative to the outer cannula (1) such that the needle set (10) has an opened position wherein the inner opening (12) is located adjacent to the outer opening (14), and a closed position wherein the outer cannula (1) covers the inner opening (12). The needle set, in a closed position, can be inserted into a body in order to collect a tissue sample. Once properly inserted, the needle set can be moved to an opened position, and then either selectively further inserted and closed to collect the tissue sample, or closed to collect the tissue sample.
Claims
1 . A biopsy needle set comprising: an outer cannula; an inner cannula; said outer cannula having a distal end with an outer opening; said inner cannula having a distal end with an inner opening; said inner cannula rotatably mounted inside said outer cannula; said needle set having an open position wherein said inner opening is located adjacent said outer opening, and a closed position wherein said outer cannula covers the inner opening; said outer cannula has a first longitudinal axis; said inner cannuia has a second longitudinal axis; said inner cannula is rotatably mounted about the second longitudinal axis; said outer cannula has an outer distal tip; said inner cannula has an inner distal tip which mates inside of the outer distal tip and is held in place inside the outer distal tip as the inner cannula and the outer cannula are rotated relative to each other; said outer opening of said outer cannula has a first cutting edge ground thereon; said inner opening of said inner cannula has a second cutting edge ground thereon; wherein said first cutting edge is ground to about the first longitudinal axis at the outer distal tip of the outer cannula and said second cutting edge is ground to about the second longitudinal axis at the inner distal tip of the inner cannula; and wherein the first and second cutting edge are without serrations in order to facilitate the slicing off of tissue as the needle set is urged past tissue along a direction co-linear with the first and second longitudinal axis. - -
2. The needle set of claim 1 wherein: in said closed position said inner cannula covers said outer opening.
3. The needle set of claim 1 wherein: said outer cannula is made from a first pencil pointed needle; and said inner cannula is made from a second pencil pointed needle which fits inside of the first pencil pointed needle. .
4. Canceled.
5. The needle set of claim 1 including: a mandrel located inside of the inner cannula and mounted for movement along said second longitudinal axis of said inner cannula.
6. Canceled.
7. The needle set of claim 3 wherein: said outer opening is formed in the first pencil pointed needle by grinding the distal end of the first pencil pointed needle; and said inner opening is formed in the second pencil pointed needle by grinding the distal end of the second pencil pointed needle.
8. Canceled.
9. A method of making a needle set comprising the sets of: selecting a first needle with a first longitudinal body, having a first longitudinal axis, and a first distal end; selecting a second needle with a second longitudinal body, having a second longitudinal axis that is co-linear with the first longitudinal axis, and a second distal end, which second needle that fits inside and is rotatable inside of the first needle; - -
creating a first opening in said first longitudinal body adjacent to the first distal end, wherein said first opening extends to about said first longitudinal axis at said first distal end; creating a second opening in said second longitudinal body adjacent to the second distal, wherein said second opening extends to about said second longitudinal axis at said second distal end; with the needle set in an open position pursuant to the rotation of the first needle relative to the second needle, ensuring that the first opening is adjacent to the second; [and! with the needle set in a closed position pursuant to the rotation of the first needle relative to the second needle, ensuring that the first longitudinal body covers the second opening; selecting said first needle to be a pencil pointed needle; selecting said second needle to be a pencil pointed needle; grinding a first edge on said first opening which first edge is without serrations; and grinding a second edge on said second opening which second edge is without serrations.
10. Canceled.
1 1 . Canceled.
12. A method of making a biopsy of tissue in a body including the steps of: selecting a needle set which includes:
(a) an outer cannula;
(b) an inner cannula;
(c) said outer cannula having a distal end with an outer opening;
(d) said inner cannula having a distal end with an inner opening; -20-
(e) said inner cannula rotatably mounted inside said outer cannula; and
(f) said needle set having an open position wherein said inner opening is located adjacent said outer opening, and a closed position wherein said outer cannula covers the inner opening; inserting said needle set in the body; said inserting step includes inserting the needle set into the body adjacent to the tissue to be samples; positioning the needle set in the open position; said inserting step then including further inserting the needle set into the body to capture tissue in the needle set as the needle set is being further inserted into the body in order to capture a tissue sample that is longer than the inner opening of the inner cannula; and positioning said needle set in the closed position to sever the captured tissue.
1 3. Canceled.
14. The method of claim 12 including the steps of: removing the needle set from the body; positioning the needle set to the open position; and using a mandrel located in the inner cannula to force out the tissue sample.
1 5. The method of claim 12 including the steps of: pulling the inner cannula longitudinally out of the outer cannula in order to have access to the tissue sample.
16. The method of claim 15 including the steps of: reinserting the inner cannula in the outer cannula; and collecting a second tissue sample without having to puncture the skin of the body a second time.
1 7. The needle set of claim 1 wherein: said first cutting edge and said second cutting edge are ground so that, in a plane which is substantially perpendicular to the first and second axis, said edges slope toward each other.
-22-
STATEMENT UNDER ARTICLE 19
Currently, claims 1-3, 5, 7, 9, 12-16 are pending, and claim 17 has been added.
The current application was filed on 18 March 1997 with 16 claims. Applicant hereby amends the above PCT application due to a response amendment filed by Applicant dated October 6, 1997 in the corresponding U.S. case, U.S. Serial No. 08/619,089, filed March 22, 1996. Applicant submits a copy of the above U.S. response, outlining all amendments made in the U.S. and PCT applications. Applicant also submits the enclosed substitute pages 12-17, which pages are intended to replace pages 12-17, inclusive of the application as originally filed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/619,389 | 1996-03-22 | ||
| US08/619,389 US5823970A (en) | 1996-03-22 | 1996-03-22 | Biopsy needle set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1997034531A1 WO1997034531A1 (en) | 1997-09-25 |
| WO1997034531B1 true WO1997034531B1 (en) | 1997-11-06 |
Family
ID=24481723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/004306 WO1997034531A1 (en) | 1996-03-22 | 1997-03-18 | Improved biopsy needle set |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5823970A (en) |
| WO (1) | WO1997034531A1 (en) |
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- 1996-03-22 US US08/619,389 patent/US5823970A/en not_active Expired - Fee Related
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