摘要:
The biodegradable mesh and film stent for use in blood vessels is formed of a sheet of a composite mesh material formed of biodegradable high strength polymer fibers bonded together with a second biodegradable adhesive polymer, and laminated on at least one side with a thin film of a third biodegradable polymer. The biodegradable mesh and film material is formed as a sheet and cut in a shape that can be used as a stent, such as a "belt-buckle" type shape, the ends of which can be joined in a contractible, expandable loop. In the method of making the biodegradable composite mesh and film stent, the composite mesh is preferably formed from a weave formed of high strength biodegradable polymeric fibers, and a plurality of low temperature melting biodegradable polymeric fibers. In an alternate embodiment, the high strength fibers are commingled with the low temperature melting fibers. In another alternate embodiment, the high strength fibers are coated with the low temperature melting polymer. The composite mesh is covered on at least one side by a laminating film, and is then cut into the shape of the stent.
摘要:
A flexible structural apparatus which may be used as a wound covering which extends above the wound such that the wound covering does not contact the wound and also protects the wound from contact. The apparatus provides a high degree of flexibility while retaining structural strength and resisting collapse, for example, so as to adequately protect the wound. Various embodiments include parallel beams and connections between beams that alternate in location along the beams to provide flexibility. Some embodiments may be used as springs and may have attachment features, such as holes, which may be located at the end beams, for example.
摘要:
A vaso-occlusive device comprises a flexible tubular structure configured by creating slots on a tubular structure. The slots are configured such that connecting elements are produced between resulting adjacent segments of the slotted tubular structure. The connecting elements are preferably parallel to the opening within the vaso-occlusive tubular structure. The slotted tubular structure design provides flexibility as well as specific tie points for attachment of thrombogenic fibers.
摘要:
A stent crimping apparatus for crimping a deformable radioactive stent onto a deployment device which includes a first jaw member defining a shielded first compression surface, and an opposed, second jaw member defining a shielded second compression surface oriented opposite the first compression surface. The first and second compression surfaces are adapted to collectively form an elongated guide bore formed for axial receipt of the deformable stent and the deployment device therein. To protect against exposure to the radioactive stent, a shield assembly is provided defining an opening into a bore therein which is formed and dimensioned for longitudinal receipt of the deformable stent in an uncrimped condition. A shield assembly defines an opening into the bore, and cooperates with the first and second jaw members to substantially prevent radioactive particles emitted by the radioactive stent from passing out of the crimping apparatus. An operating mechanism is operatively coupled to the first and second jaw members for selective movement between a loading condition and a crimping condition. In the loading condition, the uncrimped stent and the deployment device may be inserted through the opening and into the bore. In the crimping condition, the deformable stent is radially compressed onto the deployment device between the first and second compression surfaces.
摘要:
A radiation shield assembly (30) for a radioactive stent (11) mounted onto a deployment portion (20) of a delivery apparatus (12) including a relatively thin, elongated tube member (69) having a wall (70) defining a receiving passage (72) formed and dimensioned for axial receipt of the stent mounted onto the deployment portion therein to substantially prevent direct contact with the stent (11). A removal structure (71) cooperating with the wall (70) of the tube member (69) for longitudinal severing thereof to enable selective removal of the tube member from the delivery apparatus (12) for deployment use thereof.
摘要:
The invention is directed to an expandable stent for implanting in a body lumen, such as a coronary artery. The stent has an open lattice structure and is constructed so that at least one end section has a thicker cross-section and corresponding greater radial strength than the remaining sections of the stent.