US3228894A - Fluorocarbon tungsten members - Google Patents
Fluorocarbon tungsten members Download PDFInfo
- Publication number
- US3228894A US3228894A US246684A US24668462A US3228894A US 3228894 A US3228894 A US 3228894A US 246684 A US246684 A US 246684A US 24668462 A US24668462 A US 24668462A US 3228894 A US3228894 A US 3228894A
- Authority
- US
- United States
- Prior art keywords
- fluorocarbon
- tungsten
- radiopaque
- powder
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
- A61M25/0108—Steering means as part of the catheter or advancing means; Markers for positioning using radio-opaque or ultrasound markers
Definitions
- the unusual properties of the fiuorocarbons are ideal for forming extruded tubing such as cardiac or other catheters because of the following properties, among others.
- Second, the curved distal tips are heat set at over 600 F. and do not flatten out at body temperature, thus making introduction easier.
- Third, the lowest coeflicient of friction of any known materials makes them less traumatic and easier to introduce.
- their non-wettable surfaces reduce the tendency of the catheter to coagulate blood.
- Fifth, their zero absorption of water as liquid or vapor causes catheters to retain their length and hardness longer than most other materials.
- Extrusion may be from a melted liquid (FEP) or the extrusion and sintering may be a simultaneous operation starting with a dry mixture of materials if sufficient pressure and proper temperature is used.
- FEP melted liquid
- the sintering temperature will be that normal for polytetrafluoroethylene which presently ranges from 650-800 F.
- the invention is applicable to any of the fluorocarbons, e.g.
- TFE polytetrafluoroethylene
- FEP fluorinated ethylene propylene
- EL-F polytrifluorochloroethylene
- tungsten Since tungsten is very dense (specific gravity of 19.3), its relative volume in the composition will be much less than its relative weight.
- the range of tungsten by weight is preferably from 5 to 30% of the total composition. Amounts outside this range are usable but. the radiopacity is relatively weak below 5% and the mechanical properties of the fluorocarbon is weakened above 30%.
- a radiopaque material comprising a solid fluorocarbon polymer and sufficient tungsten intimately mixed therewith to render said material radiopaque.
- a radiopaque extruded member comprising a solid fluorocarbon polymer and suflicient tungsten intimately mixed therewith to render said material radiopaque.
- a radiopaque extruded and sintered tube member formed from a fluorocarbon polymer powder and 5 to 30% by weight of tungsten powder intimately mixed therewith.
- a method for forming a radiopaque tube comprising intimately mixing fluorocarbon polymer powder and sufiicient tungsten powder to render said tube radiopaque, extruding said mixed powder as said tube, and sintering said extruded tube at about 650800 F.
Description
United States Patent C 3,228,894 FLUORQCARBON TUNGSTEN MEMBERS Norman C. Jeckel, Glens Falls, N.Y., assignor to United States Catheter 81 Instrument Corporation, Glens Falls, N.Y., a corporation of New York No Drawing. Filed Dec. 24, 1962, Ser. No. 246,684 Claims. (Cl. 252478) This invention relates to new and useful improvements in radiopaque fluorocarbon tubing and more particularly seeks to provide a cardiac catheter composed primarily of fluorocarbon and tungsten.
The unusual properties of the fiuorocarbons, particularly polytetrafiuoroethylene, are ideal for forming extruded tubing such as cardiac or other catheters because of the following properties, among others. First, within the temperature range of 70-110 F., there is no appreciable change in degree of stiffness. Second, the curved distal tips are heat set at over 600 F. and do not flatten out at body temperature, thus making introduction easier. Third, the lowest coeflicient of friction of any known materials makes them less traumatic and easier to introduce. Fourth, their non-wettable surfaces reduce the tendency of the catheter to coagulate blood. Fifth, their zero absorption of water as liquid or vapor causes catheters to retain their length and hardness longer than most other materials. Sixth, they are unaffected by temperature up to 600 F. and thus may be repeatedly boiled or autoclaved with no harmful effect. The autoclaving causes no softening and need not be followed by drying because no moisture can be absorbed as already pointed out. Seventh, nothing sticks to fluorocarbons, not even strong adhesives, and thus they are easy to clean and have much less tendency to collect deposits of any kind. Eighth, the lumen is extremely smooth and friction-free so as to be ideal for injections where the lowest possible resistance to flow is necessary. Ninth, the materials are non-toxic, inert and have a lower order of tissue reactivity.
It is essential in most instances for cardiac catheters to be radiopaque in order to follow the path of introduction on the fluoroscope. Accordingly, conventional radiopaque metals such as tin, lead and bismuth have been added to the fluorocarbons. However, the powdered polytetrafluoroethylene is extruded at room temperature but then sintered at 650-800 F., generally 750, whereupon these metals are discolored and thereafter deteriorate relatively rapidly so that the catheters tend to split, crack, etc., under pressure and mechanical distortion. Furthermore, these metals are medically toxic.
It is, therefore, an object of this invention to provide a radiopaque fluorocarbon tube which will not discolor during sintering, nor deteriorate thereafter and which will contain no medically toxic materials.
I have found that these objects may be attained by incorporating tungsten Within the fluorocarbon composition of cardiac catheters or other radiopaque members.
With the above objects and features in view, the nature of which will be more apparent, the invention will be more fully understood by reference to the accompanying detailed description and the appended claims.
To 80 parts by weight of polytetrafluoroethylene powder is intimately mixed 20 parts of tungsten powder and suflicient mineral spirits solvent to make a paste for extrusion. This is then extruded at room temperature into the desired cardiac catheter shape and subsequently sintered at about 750 F. to produce a non-toxic catheter 3,228,894 Patented Jan. 11, 1966 having excellent flex-resistance with no deterioration or discoloration.
It is obvious that in addition to cardiac catheters, any tubular, rod or other shape extrusion where radiopacity is desired may be formed. Extrusion may be from a melted liquid (FEP) or the extrusion and sintering may be a simultaneous operation starting with a dry mixture of materials if sufficient pressure and proper temperature is used. The sintering temperature will be that normal for polytetrafluoroethylene which presently ranges from 650-800 F. The invention is applicable to any of the fluorocarbons, e.g. polytetrafluoroethylene (TFE), fluorinated ethylene propylene (FEP), (both sold und r Du Ponts registered trademark, Teflon), polytrifluorochloroethylene (sold under Minnesota Mining and Manufacturing Companys trademark, EL-F), and other chlorinated fluorocarbons.
Since tungsten is very dense (specific gravity of 19.3), its relative volume in the composition will be much less than its relative weight. The range of tungsten by weight is preferably from 5 to 30% of the total composition. Amounts outside this range are usable but. the radiopacity is relatively weak below 5% and the mechanical properties of the fluorocarbon is weakened above 30%.
I claim:
1. A radiopaque material comprising a solid fluorocarbon polymer and sufficient tungsten intimately mixed therewith to render said material radiopaque.
2. A radiopaque extruded member comprising a solid fluorocarbon polymer and suflicient tungsten intimately mixed therewith to render said material radiopaque.
3. A radiopaque extruded and sintered tube member formed from a fluorocarbon polymer powder and 5 to 30% by weight of tungsten powder intimately mixed therewith.
4. The member of claim 3 wherein said tube is a cardiac catheter.
5. The member of claim 4 wherein said fluorocarbon is polytetrafluoroethylene.
6. The member of claim 4 having about 20% of said tungsten.
7. A method for forming a radiopaque tube comprising intimately mixing fluorocarbon polymer powder and sufiicient tungsten powder to render said tube radiopaque, extruding said mixed powder as said tube, and sintering said extruded tube at about 650800 F.
8. The method of claim 7 wherein said tungsten comprises 5 to 30% by weight of the total powder content.
9. The method of claim 8 wherein said fluorocarbon is polytetrafluoroethylene.
10. The method of claim 9 wherein said tungsten is about 20% References Cited by the Examiner UNITED STATES PATENTS 2,230,654 2/ 1941 Plunkett 260-33.8 2,644,804 7/1953 Rubin 260-33.8 2,752,637 7/1956 Walker et al. 264-119 2,857,915 10/1956 Sheridan 128349 2,985,918 5/1961 Moore et al 260-338 3,075,925 1/1963 Dunegan 252478 3,089,866 5/1963 Crawford 26087.5 X 3,094,585 6/ 1963 Rudner 264-127 X CARL D. QUARFORTH, Primary Examiner.
REUBEN EPSTEIN, Examiner.
Claims (1)
1. A RADIOPAQUE MATERIAL COMPRISING A SOLID FLUOROCARON POLYMER AND SUFFICIENT TUNGSTEN INTIMATELY MIXED THEREWITH TO RENDER SAID MATERIAL RADIOPAQUE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US246684A US3228894A (en) | 1962-12-24 | 1962-12-24 | Fluorocarbon tungsten members |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US246684A US3228894A (en) | 1962-12-24 | 1962-12-24 | Fluorocarbon tungsten members |
Publications (1)
Publication Number | Publication Date |
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US3228894A true US3228894A (en) | 1966-01-11 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US246684A Expired - Lifetime US3228894A (en) | 1962-12-24 | 1962-12-24 | Fluorocarbon tungsten members |
Country Status (1)
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1965487A1 (en) * | 1968-12-31 | 1970-11-19 | Chemplast Inc | Catheter and process for its manufacture |
US3612038A (en) * | 1969-02-03 | 1971-10-12 | Becton Dickinson Co | Preformable catheter package assembly and method of preforming |
US3815608A (en) * | 1972-03-10 | 1974-06-11 | East West Med Prod | Retaining catheter |
US3818229A (en) * | 1970-12-21 | 1974-06-18 | Univ Illinois | Radiopaque agents comprising brominated perfluorocarbons |
US3829903A (en) * | 1972-12-11 | 1974-08-20 | Dow Corning | Method of inhibiting blood clot on silicone rubber medical devices |
US4182342A (en) * | 1978-04-28 | 1980-01-08 | Med-Pro, Ltd. | Naso-gastric feeding device and method of inserting same |
US4247510A (en) * | 1976-04-02 | 1981-01-27 | Cefilac | Process for depositing an elastomeric or thermosetting bank on a support |
US4469483A (en) * | 1982-08-25 | 1984-09-04 | Baxter Travenol Laboratories, Inc. | Radiopaque catheter |
US5147318A (en) * | 1991-03-04 | 1992-09-15 | Board Of Regents, The University Of Texas System | Valved arterial catheter |
US5336205A (en) * | 1993-02-25 | 1994-08-09 | Target Therapeutics, Inc. | Flow directed catheter |
US5538512A (en) * | 1993-02-25 | 1996-07-23 | Zenzon; Wendy J. | Lubricious flow directed catheter |
US5730733A (en) * | 1995-06-01 | 1998-03-24 | Scimed Life Systems, Inc. | Flow assisted catheter |
US5899892A (en) * | 1996-05-31 | 1999-05-04 | Scimed Life Systems, Inc. | Catheter having distal fiber braid |
US6193705B1 (en) | 1998-10-28 | 2001-02-27 | Scimed Life Systems, Inc. | Flow assisted catheter |
US20040220549A1 (en) * | 2003-04-14 | 2004-11-04 | Dittman Jay A. | Large diameter delivery catheter/sheath |
US20050090802A1 (en) * | 2003-04-28 | 2005-04-28 | Connors John J.Iii | Flexible sheath with varying durometer |
EP2561898A1 (en) | 2011-08-25 | 2013-02-27 | Cook Medical Technologies LLC | Medical balloon and balloon catheter assembly |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230654A (en) * | 1939-07-01 | 1941-02-04 | Kinetic Chemicals Inc | Tetrafluoroethylene polymers |
US2644804A (en) * | 1950-04-22 | 1953-07-07 | Kellogg M W Co | Packing composition containing polytrifluorochloroe thylene and an inorganic antifriction agent |
US2752637A (en) * | 1954-07-01 | 1956-07-03 | Resistoflex Corp | Extrusion of polytetrafluoroethylene |
US2857915A (en) * | 1956-04-02 | 1958-10-28 | David S Sheridan | X-ray catheter |
US2985918A (en) * | 1959-01-20 | 1961-05-30 | Raybestos Manhattan Inc | Method for forming shaped lengths of tetrafluoroethylene polymers having a cellular structure |
US3075925A (en) * | 1960-12-21 | 1963-01-29 | Harold L Dunegan | Radiation shielding composition |
US3089866A (en) * | 1956-05-25 | 1963-05-14 | Minnesota Mining & Mfg | Process for the preparation of fluorine-containing polymers |
US3094585A (en) * | 1951-04-16 | 1963-06-18 | Garlock Inc | Fluorocarbon resin mixtures and metal to plastic bonding |
-
1962
- 1962-12-24 US US246684A patent/US3228894A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230654A (en) * | 1939-07-01 | 1941-02-04 | Kinetic Chemicals Inc | Tetrafluoroethylene polymers |
US2644804A (en) * | 1950-04-22 | 1953-07-07 | Kellogg M W Co | Packing composition containing polytrifluorochloroe thylene and an inorganic antifriction agent |
US3094585A (en) * | 1951-04-16 | 1963-06-18 | Garlock Inc | Fluorocarbon resin mixtures and metal to plastic bonding |
US2752637A (en) * | 1954-07-01 | 1956-07-03 | Resistoflex Corp | Extrusion of polytetrafluoroethylene |
US2857915A (en) * | 1956-04-02 | 1958-10-28 | David S Sheridan | X-ray catheter |
US3089866A (en) * | 1956-05-25 | 1963-05-14 | Minnesota Mining & Mfg | Process for the preparation of fluorine-containing polymers |
US2985918A (en) * | 1959-01-20 | 1961-05-30 | Raybestos Manhattan Inc | Method for forming shaped lengths of tetrafluoroethylene polymers having a cellular structure |
US3075925A (en) * | 1960-12-21 | 1963-01-29 | Harold L Dunegan | Radiation shielding composition |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1965487A1 (en) * | 1968-12-31 | 1970-11-19 | Chemplast Inc | Catheter and process for its manufacture |
US3608555A (en) * | 1968-12-31 | 1971-09-28 | Chemplast Inc | Radio opaque and optically transparent tubing |
US3612038A (en) * | 1969-02-03 | 1971-10-12 | Becton Dickinson Co | Preformable catheter package assembly and method of preforming |
US3818229A (en) * | 1970-12-21 | 1974-06-18 | Univ Illinois | Radiopaque agents comprising brominated perfluorocarbons |
US3815608A (en) * | 1972-03-10 | 1974-06-11 | East West Med Prod | Retaining catheter |
US3829903A (en) * | 1972-12-11 | 1974-08-20 | Dow Corning | Method of inhibiting blood clot on silicone rubber medical devices |
US4247510A (en) * | 1976-04-02 | 1981-01-27 | Cefilac | Process for depositing an elastomeric or thermosetting bank on a support |
US4182342A (en) * | 1978-04-28 | 1980-01-08 | Med-Pro, Ltd. | Naso-gastric feeding device and method of inserting same |
US4469483A (en) * | 1982-08-25 | 1984-09-04 | Baxter Travenol Laboratories, Inc. | Radiopaque catheter |
US5147318A (en) * | 1991-03-04 | 1992-09-15 | Board Of Regents, The University Of Texas System | Valved arterial catheter |
WO1992015352A1 (en) * | 1991-03-04 | 1992-09-17 | Board Of Regents, The University Of Texas System | Valved arterial catheter |
US5538512A (en) * | 1993-02-25 | 1996-07-23 | Zenzon; Wendy J. | Lubricious flow directed catheter |
US5336205A (en) * | 1993-02-25 | 1994-08-09 | Target Therapeutics, Inc. | Flow directed catheter |
US5730733A (en) * | 1995-06-01 | 1998-03-24 | Scimed Life Systems, Inc. | Flow assisted catheter |
US5947939A (en) * | 1995-06-01 | 1999-09-07 | Scimed Life Systems, Inc. | Flow assisted catheter |
US5899892A (en) * | 1996-05-31 | 1999-05-04 | Scimed Life Systems, Inc. | Catheter having distal fiber braid |
US5961511A (en) * | 1996-05-31 | 1999-10-05 | Scimed Life Systems, Inc. | Catheter having LCP reinforced distal portion |
US6193705B1 (en) | 1998-10-28 | 2001-02-27 | Scimed Life Systems, Inc. | Flow assisted catheter |
US20040220549A1 (en) * | 2003-04-14 | 2004-11-04 | Dittman Jay A. | Large diameter delivery catheter/sheath |
US7704245B2 (en) | 2003-04-14 | 2010-04-27 | Cook Incorporated | Large diameter delivery catheter/sheath |
US20100163159A1 (en) * | 2003-04-14 | 2010-07-01 | Cook Incorporated | Large diameter delivery catheter/sheath |
US7968038B2 (en) | 2003-04-14 | 2011-06-28 | Cook Medical Technologies Llc | Large diameter delivery catheter/sheath |
US20050090802A1 (en) * | 2003-04-28 | 2005-04-28 | Connors John J.Iii | Flexible sheath with varying durometer |
US11000670B2 (en) | 2003-04-28 | 2021-05-11 | Cook Medical Technologies Llc | Flexible sheath with varying durometer |
EP2561898A1 (en) | 2011-08-25 | 2013-02-27 | Cook Medical Technologies LLC | Medical balloon and balloon catheter assembly |
US9629984B2 (en) | 2011-08-25 | 2017-04-25 | Cook Medical Technologies Llc | Medical balloon and balloon catheter assembly |
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