 System for intravenous therapy |
| We claim: 1. An administration set for use with a parenteral therapeutic system, the administration ... |
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| Intravenous medication |
| I claim: 1. A formulation chamber for use in a parenteral delivery system, comprising: (a) a wall ... |
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| Coiled transition balloon catheter, assembly and procedure |
| In accordance with the present invention, a balloon dilatation catheter is provided which ... |
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| Process for the production of abrasives |
| What we claim is: 1. A process for preparing a waterproof abrasive which comprises forming a ... |
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| Resin systems for high energy electron curable resin coated webs |
| OF THE INVENTION The resin systems of the instant invention provide advantages over prior systems. ... |
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| Resin systems for high energy electron curable resin coated webs |
| OF THE INVENTION The resin systems of the invention may be utilized to form fibrous backed, ... |
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| Plural layered coated abrasive |
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| Fluidized bed gasification ash reduction and removal process |
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| Apparatus for humidifying a gas |
| The invention seeks to provide an apparatus for humidifying, in particular, dry oxygen gas, which ... |
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| Atomizing and mixing apparatus |
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Atherectomy device
| Details |
Inventors: Shturman, Leonid;
Assignee: Shturman Cardiology Systems, Inc. (Minneapolis, MN)
Primary Examiner: Buiz; Michael Powell
Assistant Examiner: Lewis; William
Attorney, Agent or Firm: Kaihoi; Gregory P.
A rotational atherectomy device having directional control for selectively removing tissue from an artery (or other bodily passageway or cavity). The atherectomy device includes a rotational atherectomy apparatus having a flexible, elongated drive shaft disposed in the lumen of a catheter. A central portion of an intermediate segment of the drive shaft is coated with an abrasive material to define an abrasive segment of the drive shaft. The drive shaft has a central lumen for receipt of a guide wire therein, and around which the drive shaft may be rotated. The guide wire has an intermediate portion with a predetermined curved positioning portion such that when the abrasive segment of the drive shaft is located along the curved positioning portion of the guide wire, such curved positioning portion of the guide wire urges the abrasive segment of the drive shaft laterally. The catheter has an elongated aperture in its side wall, the aperture having a width permitting the abrasive segment of the drive shaft to extend through it so that when the abrasive segment of the drive shaft and the curved positioning portion of the guide wire are both aligned with the aperture, then the curved positioning portion of the guide wire urges the abrasive segment of the drive shaft laterally out through the catheter aperture to engage tissue to be removed from the bodily passageway or cavity. In a preferred embodiment, the catheter includes two lumens, one for a conventional guide wire and the other for a separate positioning wire having the predetermined curved positioning portion for laterally positioning the abrasive segment of the drive shaft. |
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DETAILED DESCRIPTION The invention provides a rotational atherectomy device having directional control for selectively removing tissue from an artery (or other bodily passageway or cavity).
The atherectomy device includes a rotational atherectomy apparatus having a flexible, elongated drive shaft with a proximal segment, an intermediate segment, and a distal segment, a portion of the intermediate segment being coated with an abrasive material to define an abrasive segment of the drive shaft.
In one embodiment, the drive shaft has a central lumen for receipt of a guide wire therein, and around which the drive shaft may be rotated.
The guide wire has proximal, intermediate and distal portions, the proximal portion being generally straight, and the intermediate portion having a predetermined curved positioning segment such that when the abrasive segment of the drive shaft is located along the curved positioning segment of the guide wire, such curved segment of the guide wire urges the abrasive segment of the drive shaft laterally.
The device also includes a catheter having walls defining a lumen sized to receive the drive shaft in it.
The catheter has proximal, intermediate and distal sections, and the wall of the intermediate section includes an elongated aperture, the aperture having a width and length permitting the abrasive segment of the drive shaft to extend through it so that when the abrasive segment of the drive shaft and the curved positioning segment of the guide wire are both aligned with the aperture, the curved positioning segment of the guide wire urges the abrasive segment of the drive shaft laterally out through the catheter aperture to engage tissue to be removed from the bodily passageway or cavity.
In a preferred embodiment, the catheter includes two lumens, one for a conventional guide wire and the other for the drive shaft which is rotatable around a separate positioning wire having a predetermined curved positioning segment for pushing the abrasive segment of the drive shaft laterally through the elongated aperture in the wall of the catheter
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Liquid Purification 
