WO1995033512A1 - Flexible source wire for radiation treatment - Google Patents
Flexible source wire for radiation treatment Download PDFInfo
- Publication number
- WO1995033512A1 WO1995033512A1 PCT/US1995/006886 US9506886W WO9533512A1 WO 1995033512 A1 WO1995033512 A1 WO 1995033512A1 US 9506886 W US9506886 W US 9506886W WO 9533512 A1 WO9533512 A1 WO 9533512A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flexible
- wire
- housing tube
- accordance
- source wire
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F5/00—Transportable or portable shielded containers
- G21F5/015—Transportable or portable shielded containers for storing radioactive sources, e.g. source carriers for irradiation units; Radioisotope containers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
- A61N5/1002—Intraluminal radiation therapy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
- A61N2005/1019—Sources therefor
- A61N2005/1025—Wires
Definitions
- the present invention relates to the use of radioactive sources to treat diseases of the body. More particularly, the present invention relates to the use of a flexible member housing a radioactive source for the temporary delivery of radiation to treat diseases of the body.
- Radiation is used to treat cancer and other diseases of the body. Radiation has long been proven to destroy fast multiplying cells (e.g., cancer) in hopes of destroying or preventing the spread of the disease.
- Brachytherapy which is the treatment of cancer at close distances, is one example of the use of radiation for treating diseases of the body.
- a radioactive source or sources are positioned in the area needing treatment. Depending on the shape, size and delivery means of the radioactive sources, the sources are either kept permanently in the body or removed after a specific amount of time. Since permanent implants are tiny seeds approximately 3mm long and .5mm wide, the use of these seeds do not relate to the present invention. Consequently, the focus of this applica ⁇ tion will be on the field of temporary implants.
- the term temporary implants describes the procedure of maneuvering a radioactive source or sources to the treatment site utilizing a transport catheter or tube which has been previously placed in the vicinity of this treatment site.
- the transport catheter and temporary implant can simultaneously be maneuvered to the treatment site.
- these sources and the transport catheter or tube are removed from the body.
- the radioac ⁇ tive source or sources may encounter a tortuous path in various arteries, veins, ducts, or the like inside the body to reach the treatment site, the radioactive source is usually attached by some device to a flexible drive member. This source and the drive member may be used many times, and, therefor must be able to withstand the many bends it encounters when it is maneuvered to the treatment site or removed therefrom, without breaking.
- U.S. Patent 5,084,002 issued to Liprie describes an ultra-thin high dose iridium source included within an oversized hole drilled inside the end of a solid platinum wire. The whole assembly is then drawn down to the desired diameter of the wire. While this patent does not describe the situation in which a radioactive source is joined to the end of a solid cable, the platinum delivery wire would still present problems with respect to maneuvering the wire through the numeral twists and turns in the body.
- U.S. Patent 5,282,781 issued to Liprie employs a tube, a backbone wire, a pure iridium core and a plug and draws down the entire assembly to form a tight seal between the housing material and the backbone wire and the plug. Without this drawing down of the housing onto the backbone wire, radioactive flakes from the core would migrate throughout the inside of the assembly wire, resulting in unwanted contamination. This "drawing down” step would increase the costs and difficulty of manufacturing the source wire.
- the flexible source wire includes a flexible housing in the form of an elongated hollow tube constructed from a material such as Nitinol ® or a titanium/nickel alloy which exhibits little or no memory retention when it is bent.
- An internal flexible backbone wire also constructed from the same material as the flexible tube which exhibits little or no memory retention. The backbone wire is provided within the flexible tube.
- a thin-walled capsule or encapsulated radioactive core as well as a plug is also provided within the flexible tube.
- the backbone wire is welded to the distal end of the tube and runs throughout the length of the flexible tube to a distance just short of the proximal end of the tube.
- the radioactive capsule or encapsulated radioactive core which is provided in the proximal portion of the flexible tube, abuts the end of the backbone wire.
- the encapsulating material must have a very thin wall to allow flexibility. This thin wall should be constructed from material that will block very little of the neutron flux as the core is being irradiated, as well as not becoming radioactive or exhibit an insignificant amount of radioactivity after a period of approximately 20 days. A good example of this material is titanium, platinum, gold or high purity aluminum such as aluminum 1100.
- a plug is provided at the proximal end of the tube to seal the radioactive capsule or the encapsulated radioactive core within the tube.
- Mounting the radioactive source into the segment of a tube which is naturally stiff would not add any appreciable resistance to bending, in contradistinction to the Liprie '618 and Liprie '487 patents, as well as the patent to van't Hooft. Since material such as Nitinol ® as well as a titanium/nickel alloy which exhibits little or no memory retention when bent have dissimilar welding properties than other metals, they do not form a strong bond against the stress of repeated bending. This feature would reduce the possibility that the device is prone to breakage.
- a larger outside diameter wire will be needed to compensate for the drifting and still allow the walls of the cavity to be thick enough to withstand stress.
- this larger diameter wire might be too large to fit into many constricted areas of the body. Additionally, this larger diameter wire would result in less flexibility and may not be able to be maneuvered to the treatment site.
- Another method of drilling the cavity inside a solid wire would be to start with an oversize wire and an oversize hole and draw the entire structure down to size.
- FIG. 1 is a partial cross-section of the invention showing a radioactive core inside a thin wall capsule provided within the flexible source tube;
- FIG. 2 is a partial cross-section of the present invention showing the use of the encapsulated core within the flexible source tube;
- FIG. 3 is a partial cross-section of the present invention provided with a proximal end having a funnel shape.
- FIG. 1 illustrates a first embodiment of the present invention 10 utilizing a radioactive core 16 provided within a thin-walled capsule.
- This embodiment employs an elongated hollow housing tube 12 constructed from a material such as Nitinol ® , a titanium/nickel alloy or similar materials which exhibit little or no ' memory retention when the tube is bent. Since this housing tube is used to maneuver the radioactive core to a remote treatment site, the length of the tube is generally greater than 100cm and, could extend for a much greater distance. Additional ⁇ ly, since the housing tube must be maneuvered within various twists and turns in the body through various conduits therein, the diameter of this tube could range from 0.018" to 0.023".
- a flexible backbone wire 14 is provided between the distal end 11 of housing tube 12 and extends to several millime ⁇ ters from the end of the proximal portion 13 of the housing tube. For ease of initially inserting the backbone wire 14 into the tube 12 and to allow greater pivoting of the assembly while reducing stress to the housing material, the end 24 of this wire is rounded. Similar to the housing tube 12, this backbone wire 14 can also be constructed from material such as Nitinol ® , a titanium/nickel alloy or other materials which exhibit little or no memory retention when bent.
- a capsule 20 is inserted into the proximal end of the housing tube 12 until it abuts the rounded end 24 of the backbone wire 14.
- the capsule should be manufactured from a very thin- walled metallic material.
- the radioactive core 16 is then inserted within the capsule and a plug 22 abutting the proximal end of the core 16 is provided within the capsule 20 and is used to seal the radioactive core 16 in place.
- the plug 22 is sealed in place using a weld 25 or other methods of forming a tight seal.
- the distal end of the backbone wire 18 is welded in place at 26. Both ends 21, 23 of the housing tube 12 are rounded to allow ease of movement as it travels through bends and turns in the body.
- the exterior of the housing tube 12 is coated prior to the loading of the radioactive core 16 with a non-oxidizing agent, such as gold.
- the backbone wire 14 can be welded, fused or glued to different areas of the inner tube, such as 27 to serve as an internal safety and protection device. If the outer tube 12 breaks, the radioactive source 16 would still be able to be retracted.
- a small gap 28 between the inner surface of the tube and the outer surface of the wire is provided.
- the outside diameter of the capsule 20 should fit snugly against the inside diameter of the tube 12. However, it is noted that a small gap can also be included between the capsule 20 and the interior wall of the tube 12.
- FIG. 2 illustrates a second embodiment 30 of the present invention utilizing an elongated cylindrical housing tube 32 similar in dimension to the tube described with respect to FIG. 1.
- This tube is constructed from material such as Nitinol ® , titanium/nickel alloy or a similar material which exhibits little or no memory retention when bent.
- a backbone wire 34 constructed from the same material as the housing tube 32 is introduced to the interior of the housing tube 32 and extends from the distal end 31 thereof to an area positioned several millimeters from the proximal end 33 of the tube.
- the backbone wire 34 is provided with rounded end 42 to aid in movement within the tube 32.
- a source of radioactivity 36 is provided within a thin wall encapsulating material 40 so that it abuts the rounded end 42 of the backbone wire 34.
- This thin material 40 should allow the passage of neutrons to irradiate the inner core but the same time this material should obtain no significant radioactivity.
- the radioactive treatment to be delivered must come from the radiation exposure of the inner core 36 and not from the radiation exposure of the encapsulation material 40.
- the encapsulation material should be flexible. A good example of this material would be platinum, gold, titanium, or high purity aluminum such as aluminum 1100.
- the backbone wire 34 is introduced into the distal end of the housing tube 32 and is welded in place by weld 44. Additionally, the backbone wire 34 can be affixed to various inner surfaces of the housing tube 32 such as at spot 48 by welding, fusing, pasting or other methods. A small gap 46 is provided between the outer surface of the backbone wire 34 and the inner surface of the housing tube 32. This gap aids in allowing the backbone wire 34 to be moved to its proper position within the housing tube 32.
- the encapsulated core is introduced into the interior of the housing tube 32 at its proximal end so that it abuts the rounded edge 42 of the backbone wire 34.
- a plug 43 is then loaded into the proximal end of the housing tube 32 so that it abuts the rounded proximal end 56 of the encapsu- lated core.
- the plug is then welded in place by weld 54.
- Both the proximal and distal ends of the ho ⁇ sing tube 32 are rounded at 50, 52 to aid in the maneuverability of the housing tube 32 within the body.
- the outer surface of the housing tube 32 is coated with a non-oxidizing agent such as gold.
- FIG. 3 illustrates a flexible source wire similar in many respects to the embodiments shown in FIGS. 1 and 2.
- similar elements in FIG. 1 will have the same reference numerals as their respective elements in FIG. 3.
- the embodiment shown in FIG. 3 illustrates a flexible source wire utilizing a radioactive core within a capsule, these teachings can also be applied to the situation in which the radioactive core is encapsulated.
- the capsule 20 is introduced into the proximal end of the housing tube 12 by utilizing a stylet.
- the inner portion of the wall of the housing tube 12 exhibits a slightly tapered funnel shape 60 or is countersunk at the proximal end of the tube to aid in the introduction of the capsule.
- the encapsulated radioactive core shown in FIG. 2 can be introduced into a tube having a slight funnel shape at its proximal end.
- the radioactive core 16 is introduced therein manually utilizing a tweezers or automatically employing a similar device in a robot handling system.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU29427/95A AU695062B2 (en) | 1994-06-08 | 1995-06-08 | Flexible source wire for radiation treatment |
JP8501167A JP2916952B2 (en) | 1994-06-08 | 1995-06-08 | Flexible source wire for radiation treatment |
EP95925233A EP0765175B1 (en) | 1994-06-08 | 1995-06-08 | Flexible source wire for radiation treatment |
DE69533423T DE69533423T2 (en) | 1994-06-08 | 1995-06-08 | FLEXIBLE CABLE WITH RADIOACTIVE SOURCE FOR RADIATION TREATMENTS |
CA002192081A CA2192081C (en) | 1994-06-08 | 1995-06-08 | Flexible source wire for radiation treatment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/257,045 US5503614A (en) | 1994-06-08 | 1994-06-08 | Flexible source wire for radiation treatment of diseases |
US08/257,045 | 1994-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995033512A1 true WO1995033512A1 (en) | 1995-12-14 |
Family
ID=22974669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/006886 WO1995033512A1 (en) | 1994-06-08 | 1995-06-08 | Flexible source wire for radiation treatment |
Country Status (8)
Country | Link |
---|---|
US (1) | US5503614A (en) |
EP (2) | EP1374950A1 (en) |
JP (1) | JP2916952B2 (en) |
AU (1) | AU695062B2 (en) |
CA (1) | CA2192081C (en) |
DE (1) | DE69533423T2 (en) |
IL (1) | IL114013A (en) |
WO (1) | WO1995033512A1 (en) |
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NL1002044C2 (en) * | 1996-01-08 | 1997-07-09 | Optische Ind De Oude Delft Nv | Radioactive source that has clinically relevant beta radiation |
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US11504546B2 (en) | 2019-02-28 | 2022-11-22 | Cowles Ventures, Llc | Needle guidance device for brachytherapy and method of use |
US11524176B2 (en) | 2019-03-14 | 2022-12-13 | Cowles Ventures, Llc | Locator for placement of fiducial support device method |
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- 1995-06-06 IL IL11401395A patent/IL114013A/en not_active IP Right Cessation
- 1995-06-08 EP EP03021878A patent/EP1374950A1/en not_active Withdrawn
- 1995-06-08 AU AU29427/95A patent/AU695062B2/en not_active Ceased
- 1995-06-08 JP JP8501167A patent/JP2916952B2/en not_active Expired - Lifetime
- 1995-06-08 EP EP95925233A patent/EP0765175B1/en not_active Expired - Lifetime
- 1995-06-08 CA CA002192081A patent/CA2192081C/en not_active Expired - Fee Related
- 1995-06-08 DE DE69533423T patent/DE69533423T2/en not_active Expired - Fee Related
- 1995-06-08 WO PCT/US1995/006886 patent/WO1995033512A1/en active IP Right Grant
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0954351A1 (en) * | 1995-06-07 | 1999-11-10 | LIPRIE, Samuel F | Flexible source wire for localized internal irradiation of tissue |
EP0954351A4 (en) * | 1995-06-07 | 2002-11-13 | Interventional Therapies Llc | Flexible source wire for localized internal irradiation of tissue |
NL1002044C2 (en) * | 1996-01-08 | 1997-07-09 | Optische Ind De Oude Delft Nv | Radioactive source that has clinically relevant beta radiation |
WO1997025103A1 (en) * | 1996-01-08 | 1997-07-17 | Delft Instruments Intellectual Property B.V. | Elongated radioactive element to be attached to an end of an elongated wire-shaped element |
WO1997048452A1 (en) * | 1996-06-17 | 1997-12-24 | The State Of Israel, Atomic Energy Commission Soreq Nuclear Research Center | Rhenium radioactive catheter |
US6723052B2 (en) | 2001-06-07 | 2004-04-20 | Stanley L. Mills | Echogenic medical device |
US8560052B2 (en) | 2001-06-07 | 2013-10-15 | Core Oncology, Inc. | Echogenic medical device |
US11504546B2 (en) | 2019-02-28 | 2022-11-22 | Cowles Ventures, Llc | Needle guidance device for brachytherapy and method of use |
US11524176B2 (en) | 2019-03-14 | 2022-12-13 | Cowles Ventures, Llc | Locator for placement of fiducial support device method |
Also Published As
Publication number | Publication date |
---|---|
EP1374950A1 (en) | 2004-01-02 |
CA2192081C (en) | 2001-11-20 |
EP0765175B1 (en) | 2004-08-25 |
AU695062B2 (en) | 1998-08-06 |
DE69533423D1 (en) | 2004-09-30 |
US5503614A (en) | 1996-04-02 |
AU2942795A (en) | 1996-01-04 |
EP0765175A1 (en) | 1997-04-02 |
IL114013A (en) | 1999-12-31 |
IL114013A0 (en) | 1995-10-31 |
EP0765175A4 (en) | 2000-03-29 |
DE69533423T2 (en) | 2005-09-08 |
JP2916952B2 (en) | 1999-07-05 |
CA2192081A1 (en) | 1995-12-14 |
JPH10506020A (en) | 1998-06-16 |
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