Surface-treated stent, catheter, cannula, and the like
First Claim
1. A treated surface catheter, stent, or cannulae, comprising:
- an elongated member including a first predetermined material having a first surface energy; and
an outer surface of said member including said first material and having a second surface energy different from said first surface energy and in a range of 20 to 30 dynes per centimeter.
2 Assignments
0 Petitions
Accused Products
Abstract
Echogenic medical devices and methods of fabrication and of use are disclosed. The devices are adapted to be inserted into a patient. The device includes an elongated member including a material having an acoustic impedance different from that of the surrounding medium. The medium includes surrounding biological tissue or fluids surrounding the member when inserted into a passageway of the patient. The acoustic impedance of the elongated member is sufficiently different from the surrounding medium for enhancing an image produced in response to a sonic beam produced from imaging equipment. The elongated member also includes an interface layer of a high density metal of which the deposition on the base material of the member is ion beam assisted. The interface layer includes an outside surface having a plurality of particulate-type, discontinuous curved surfaces of partially spherical indentations formed therein or spheres extending therefrom. The difference between the acoustic impedances of the interface layer and the surrounding medium along with the discontinuous surfaces of the interface layer cooperate in response to a beam from sonic imaging equipment to significantly enhance the image of the medical device member.
559 Citations
19 Claims
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1. A treated surface catheter, stent, or cannulae, comprising:
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an elongated member including a first predetermined material having a first surface energy; and an outer surface of said member including said first material and having a second surface energy different from said first surface energy and in a range of 20 to 30 dynes per centimeter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A treated surface catheter, stent, or cannulae comprising:
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an elongated member including a first predetermined material having a first surface energy; and an outer surface including said first material and having a second surface energy different from said first surface energy, water when applied to said outer surface beading and forming a contact angle in a range of 75°
to 95°
. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An echogenic medical device insertable into a medium and imageable with sonic imaging equipment, comprising:
a member for insertion into a medium having a first acoustic impedance, said member including a base material from a group consisting of polyurethane, polyethylene, nylon, C-FLEX™
, polytetrafluoroethylene, polyvinyl chloride, polypropylene, polyester, and silicone and an interface layer deposited on said base material, said base material having an outer surface having a surface energy in a range of 20 to 30 dynes per centimeter, said interface layer deposited on said outer surface forming a deposition surface and having a discrete, particulate-type, discontinuous curved surface having a diameter less than a wavelength of a sonic beam from said imaging equipment, said member including a particulate in said deposition surface for forming said particulate-type, discontinuous surface in said deposition surface, said particulate including a plurality of particles from a group of tungsten and glass materials in a generally spherical shape, said interface layer including a metal from a group consisting of titanium, tungsten, barium, bismuth, silver, gold, platinum, and palladium different from said base material and having a second acoustic impedance different from said first acoustic impedance of said medium, said first and second acoustic impedances having at least a predetermined difference therebetween, said metal of said interface layer having been vacuum deposited on said deposition surface of said base material using ion beam assistance, whereby said difference between said first and second acoustic impedances and said curved surface responds to said sonic beam to produce an image of said member.
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16. A medical device intended for use in contact with body fluid, said device comprising a member of a first predetermined material exhibiting a first coefficient of friction;
said member comprising an outer surface of said first material having been treated by ion beam bombardment with predetermined ions and exhibiting a second coefficient of friction less than said first coefficient of friction and wherein said outer surface of said first material has a surface energy within a range of 20 to 30 dynes per centimeter. - View Dependent Claims (17, 18, 19)
Specification