US6248196B1
Expired / Lapsed
US
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Method for making a microcannula
Assignee: Lineage Cell Therapeutics Inc
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Filing: 1997-11-12
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Granted: 2001-06-19
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Expires: 2017-11-12
Abstract
Abstract A microcannula suitable for cannulation of very small blood vessels having a sharp pointed trochar tightly but removable placed in the lumen of the microcannula. The trochar is held in place by contact friction from an area of reduced inside diameter distal to the tip end, formed by welding the end distal of the microcannula to a tube having a slightly larger diameter. A process for making a microcannula is also provided.
Inventors
- 👤 Harold D. Waitz
- 👤 Hal Sternberg
- 👤 Paul E. Segall
- 👤 Bruce Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:15
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/06; A61M25/065; A61B; A61B17/00; A61B17/34; A61B17/3417; A61M25/0606; A61B2017/00526; A61M25/0021; A61M2025/0042; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
141 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube, wherein said first tube is overlapped inside said second tube at said distal end; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having said solid trochar with said pointed tip removably immobilized therein is produced.
Claim 2
Dependent Claim
141 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube, wherein said first tube is overlapped inside said second tube at said distal end; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having said solid trochar with said pointed tip removably immobilized therein is produced.
Claim 3
Dependent Claim
19 words
The process of claim 1 , wherein said alignment of said first and second tubes is on a mandrel.
Claim 4
Dependent Claim
18 words
The process of claim 2 , wherein said mandrel holding said aligned tubes is fitted into a die.
Claim 5
Dependent Claim
41 words
The process of claim 1 , wherein said heat is applied at a temperature of about 390° C. to about 410° C., said pressure of about 1-4 psi, and said temperature and pressure are applied for about 15 to 25 sec.
Claim 6
Dependent Claim
27 words
The process of claim 4 , wherein said temperature is 392-402° C., said pressure is 2 psi, and said temperature and pressure are applied for 20 sec.
Claim 7
Dependent Claim
24 words
The process of claim 1 , wherein the diameter of said area of reduced inside diameter is about 0.006 inches to about 0.007 inches.
Claim 8
Dependent Claim
16 words
The process of claim 1 , wherein said overlap is about 1 mm ({fraction (1/32)}th inch).
Claim 9
Dependent Claim
144 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube on a mandrel, wherein said first tube is overlapped inside said second tube at said distal end; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 10
Dependent Claim
144 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube on a mandrel, wherein said first tube is overlapped inside said second tube at said distal end; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 11
Dependent Claim
18 words
The process of claim 8 , wherein said mandrel holding said aligned tubes is fitted into a die.
Claim 12
Dependent Claim
41 words
The process of claim 8 , wherein said heat is applied at a temperature of about 390° C. to about 410° C., said pressure of about 1-4 psi, and said temperature and pressure are applied for about 15 to 25 sec.
Claim 13
Dependent Claim
27 words
The process of claim 10 , wherein said temperature is 392-402° C., said pressure is 2 psi, and, said temperature and pressure are applied for 20 sec.
Claim 14
Dependent Claim
24 words
The process of claim 8 , wherein the diameter of said area of reduced inside diameter is about 0.006 inches to about 0.007 inches.
Claim 15
Dependent Claim
16 words
The process of claim 8 , wherein said overlap is about 1 mm ({fraction (1/32)}nd inch).
Claim 16
Dependent Claim
157 words
A process for making a microcannula having a solid trochar with a pointed tip removable immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube, wherein said first tube is overlapped inside said second tube at said distal end such that the overlap is about 1 mm; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter from about 0.006 inches to about 0.007 inches formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 17
Dependent Claim
157 words
A process for making a microcannula having a solid trochar with a pointed tip removable immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube, wherein said first tube is overlapped inside said second tube at said distal end such that the overlap is about 1 mm; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter from about 0.006 inches to about 0.007 inches formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 18
Dependent Claim
19 words
The process of claim 14 , wherein said alignment of said first and second tubes is on a mandrel.
Claim 19
Dependent Claim
18 words
The process of claim 14 , wherein said mandrel holding said aligned tubes is fitted into a die.
Claim 20
Dependent Claim
41 words
The process of claim 14 , wherein said heat is applied at a temperature of about 390° C. to about 410° C., said pressure of about 1-4 psi, and said temperature and pressure are applied for about 15 to 25 sec.
Claim 21
Dependent Claim
27 words
The process of claim 17 , wherein said temperature is 392-402° C., said pressure is 2 psi, and said temperature and pressure are applied for 20 sec.
Claim 22
Dependent Claim
186 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube on a mandrel fitted into a die, wherein said mandrel and die are dimensioned to provide an area of reduced inside diameter from about 0.006 to about 0.007 inches, wherein said first tube is overlapped inside said second tube at said distal end such that the overlap is about 1 mm; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter from about 0.006 inches to about 0.007 inches formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 23
Dependent Claim
186 words
A process for making a microcannula having a solid trochar with a pointed tip removably immobilized therein, said process comprising the steps of: providing a first hollow tube having a beveled end and distal end; aligning said first hollow tube with a second hollow tube on a mandrel fitted into a die, wherein said mandrel and die are dimensioned to provide an area of reduced inside diameter from about 0.006 to about 0.007 inches, wherein said first tube is overlapped inside said second tube at said distal end such that the overlap is about 1 mm; applying sufficient heat and pressure for a time to said overlap, wherein said first tube is welded at said distal end to said second tube, wherein a microcannula having an area of reduced inside diameter from about 0.006 inches to about 0.007 inches formed at said weld and a beveled end is produced; and inserting a solid trochar having a pointed tip into said microcannula such that said tip extends beyond said beveled end; whereby a microcannula having a solid trochar with a pointed tip removably immobilized therein is produced.
Claim 24
Dependent Claim
40 words
The process of claim 19 , wherein said heat is applied at temperature of about 390° C. to about 410° C., said pressure of about 1-4 psi, and said temperature and pressure are applied for about 15 to 25 sec.
Claim 25
Dependent Claim
27 words
The process of claim 20 , wherein said temperature is 392-402° C., said pressure is 2 psi, and said temperature and pressure are applied for 20 sec.
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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) | 2004-06-18 | 2004-12-18 | 2005-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-06-18 | 2008-12-18 | 2009-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-06-18 | 2012-12-18 | 2013-06-19 | $7700.00 | Window Closed / Lapsed |