Patent US4664657A successfully refreshed from Google Patents.
US4664657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant for catheter assemblies employing thermoplastic catheters
Assignee: Becton Dickinson and Co
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Filing: 1985-06-18
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Granted: 1987-05-12
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Expires: 2005-06-18
Abstract
Abstract A lubricating film for preventing time-temperature dependent increase in adhesion in a catheter assembly including an interference-fitted thermoplastic catheter wherein a film of polydimethylsiloxane is deposited on the tip of the cannula, preferably from a solution of a volatile solvent.
Inventors
- 👤 Victor A. Williamitis
- 👤 Charles W. McGary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:57
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/08; A61L29/085
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A catheter assembly comprising a cannula, a catheter, and a coating of polydimethylsiloxane on the surface of said cannula, said catheter being formed from a thermoplastic polymer and being carried on said cannula in an interference fit, said coating being present on the surface of said cannula where said cannula contacts said catheter, and said polydimethylsiloxane having a viscosity in the range of about 60,000 to about 2,500,000 centistokes.
Claim 2
Dependent Claim
69 words
A catheter assembly comprising a cannula, a catheter, and a coating of polydimethylsiloxane on the surface of said cannula, said catheter being formed from a thermoplastic polymer and being carried on said cannula in an interference fit, said coating being present on the surface of said cannula where said cannula contacts said catheter, and said polydimethylsiloxane having a viscosity in the range of about 60,000 to about 2,500,000 centistokes.
Claim 3
Dependent Claim
22 words
The catheter assembly of claim 1 wherein said polydimethylsiloxane has a viscosity in the range of about 600,000 to about 2,500,000 centistokes.
Claim 4
Dependent Claim
33 words
The catheter assembly of claim 2 wherein said polydimethylsiloxane is applied to said cannula in an amount based on surface area porportional to about 60 to 100 μg/cm for a 16 gauge catheter.
Claim 5
Dependent Claim
15 words
The catheter assembly of claim 3 wherein said catheter is formed from a thermoplastic polyurethane.
Claim 6
Dependent Claim
33 words
The catheter assembly of claim 4 wherein said polydimethylsiloxane is applied to said cannula in an amount based on surface area proportional to about 70 to 90 μg/cm for a 16 gauge catheter.
Claim 7
Independent Claim
71 words
A method for controlling adhesion between a cannula and a thermoplastic catheter carried on said cannula in an interference fit comprising immersing at least the distal end of said cannula in a solution of polydimethylsiloxane wherein said polydimethylsiloxane has a viscosity in the range of about 60,000 to 2,500,000 centistokes, withdrawing said cannula from said solution, drying said cannula, and inserting said cannula into a catheter formed from a thermoplastic polymer.
Claim 8
Independent Claim
71 words
A method for controlling adhesion between a cannula and a thermoplastic catheter carried on said cannula in an interference fit comprising immersing at least the distal end of said cannula in a solution of polydimethylsiloxane wherein said polydimethylsiloxane has a viscosity in the range of about 60,000 to 2,500,000 centistokes, withdrawing said cannula from said solution, drying said cannula, and inserting said cannula into a catheter formed from a thermoplastic polymer.
Claim 9
Dependent Claim
20 words
The method of claim 6 wherein said polydimethylsiloxane has a viscosity in the range of about 600,000 to 2,500,000 centistokes.
Claim 10
Dependent Claim
17 words
The method of claim 7 wherein said solution contains about 2 to 4 percent of said polydimethylsiloxane.
Claim 11
Dependent Claim
25 words
The method of claim 8 wherein said solution is a solution of polydimethylsiloxane in a solvent having a boiling point less than about 60° C.
Claim 12
Dependent Claim
28 words
The method of claim 9 wherein said polydimethylsiloxane is applied to said cannula in an amount proportional to about 60 to 100 μg/cm for a 16 gauge catheter.
Claim 13
Dependent Claim
14 words
The method of claim 10 wherein said catheter is formed from a thermoplastic polyurethane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |