EXPANDABLE MEDICAL DEVICE WITH BENEFICIAL AGENT DELIVERY MECHANISM

• US 20080243070A1
• Filed: 06/13/2008
• Published: 10/02/2008
• Est. Priority Date: 03/30/1998
• Status: Active Grant

• Current Assignee: John F. Shanley
• Original Assignee: John F. Shanley
• Inventors: Shanley, John F.
• Granted Patent: US 8,052,734 B2
• Time in Patent Office: Days
• US Class Current: 604/103.1
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0029 differing in bending or flexure capacity
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0068 the pharmaceutical product being in a reservoir

Abstract

An expandable issue supporting device of the present invention employs ductile hinges at selected points in the expandable device. When expansion forces are applied to the device as a whole, the ductile hinges concentrate expansion stresses and strains in small well defined areas. The expandable medical device including ductile hinges provides the advantages of low expansion force requirements, relatively thick walls which are radio-opaque, improved crimping properties, high crush strength, reduced elastic recoil after implantation, and control of strain to a desired level. The expandable tissue supporting device includes a plurality of elongated beams arranged in a cylindrical device and connected together by a plurality of ductile hinges. Although many ductile hinge configurations are possible, the ductile hinges preferably have a substantially constant hinge cross sectional area which is smaller than a beam cross sectional area such that as the device is expanded from a first diameter to a second diameter, the ductile hinges experience plastic deformation while the beams are not plastically deformed.

Claims

1-18. -18. (canceled)

19. An expandable medical device which is visible in x-ray and fluoroscope images, the device comprising:

a plurality of struts arranged to form an expandable cylindrical tube, the struts having a strut width in a circumferential direction; and

a plurality of ductile hinges connecting the plurality of struts, wherein the struts and ductile hinges have a thickness in a radial direction of the cylindrical tube of at least 0.003 inches (0.0762 mm), the ductile hinges each having a hinge thickness and a substantially constant width in a circumferential dimension along a portion of a hinge length, said hinge length portion being at least ⅓

of a total hinge length, and wherein the ratio of the hinge thickness to the hinge width at said hinge length portion is at least 2;

1;

wherein the hinge width is smaller than the strut width such that as the device is expanded from a first diameter to a second diameter the ductile hinges experience plastic deformation while the struts are not plastically deformed.

20. The expandable medical device according to claim 19, wherein the device is formed of stainless steel.

21. The expandable medical device according to claim 19, wherein the thickness of the struts and ductile hinges is a least 0.005. inches (0.127 mm).

22. The expandable medical device according to claim 19, wherein the elongated struts include a beneficial agent for delivery to a patient.

23. The expandable medical device according to claim 19, wherein a transition between the cross sectional area of the struts and the cross sectional area of the ductile hinges is an abrupt transition which extends less than 10 percent of a length of a strut.

24. The expandable medical device according to claim 19, wherein the plurality of ductile hinges are curved prismatic beams.

25. The expandable medical device according to claim 19, wherein a ratio of a length of the ductile hinges to a length of the axial struts is 1:

6 or less.