Method and apparatus for removal of enclosed abnormal deposits
First Claim
1. A cutting tool for removing abnormal deposits, comprising a cylindrically symmetric body having a center cavity and a nose , at least one cutting flute extending along the outer surface of said body each cutting flute having a circumferentially facing cutting face formed thereon, and a radial fluid port extending from in front of a respective face of a flute into said center cavity, each port having a circumferential component extending into said cavity away from said cutting face whereby rotation of said cutting tool within a blood vessel about the major axis of said body has a tendency to force blood inwardly through said port.
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Accused Products
Abstract
A device for safe removal of abnormal deposits, primarily in the human body, where differential cutting properties provide for fracture of hard matter while safely preserving soft tissue. The device includes a rotating cutting tool having spirally shaped cutting flutes having hardness-differential cutting properties. The tool is driven from outside the body by means of a flexible drive shaft at greater than 2000 revolutions per minute. A channel is incorporated in the drive shaft for adding or removing chemical matter from the internal body space to provide systematic removal of cutting debris from abnormal deposits. The cutting tool has fluid ports which communicate with the drive shaft channel. The fluid ports may be at the nose of the tool as well as around its cicumference. In the latter instance, the ports extend from in front of a cutting flute into a center cavity with a circumferential component so that rotation tends to force blood into these ports. External mass transfer machines aid in injecting or withdrawing material, such as cutting debris. Auxiliary instrumentation, such as fluoroscopy and pressure measuring apparatus, are helpful in the clinical procedure. Multiple operational cycles are easily implemented to gradually dissect the deposit while periodically reestablishing physiological viability, such as blood flow in vessels.
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Citations
32 Claims
- 1. A cutting tool for removing abnormal deposits, comprising a cylindrically symmetric body having a center cavity and a nose , at least one cutting flute extending along the outer surface of said body each cutting flute having a circumferentially facing cutting face formed thereon, and a radial fluid port extending from in front of a respective face of a flute into said center cavity, each port having a circumferential component extending into said cavity away from said cutting face whereby rotation of said cutting tool within a blood vessel about the major axis of said body has a tendency to force blood inwardly through said port.
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8. A system for removing abnormal, relatively hard deposits from a relatively soft vessel, comprising:
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a generally cylindrically symmetric cutting tool having a diameter that is smaller than the lumen of said vessel, said cutting tool having a nose and at least one cutting blade extending along an outer surface thereof, said at least one cutting blade being substantially exposed, each cutting blade having a cutting face intersecting the other surface of said tool at an angle causing fracture of said relatively hard deposits without cutting said relatively soft vessel; a flexible drive shaft having one end connected to said cutting tool, said shaft having a length that is sufficient to reach from a point outside of a patient'"'"'s body through said vessel to said abnormal deposit; a flexible guiding catheter surrounding said drive shaft over most of its length; and rotary drive means connected to said drive shaft to rotate said cutting tool in the direction that said cutting face if facing. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of removing relatively hard, abnormal deposits from a relatively soft vessel, comprising:
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inserting a guiding catheter into said vessel from a point outside the body of a patient; inserting a cutting tool mounted on a flexible drive shaft into said guiding catheter and positioning said cutting tool adjacent said deposit, said cutting tool having at least one cutting blade extending along an outer surface thereof, each blade having a cutting face intersecting an outer surface of said tool at an angle causing said cutting face to abrade said abnormal deposits without cutting said relatively soft vessel; and rotating said drive shaft. - View Dependent Claims (27, 28, 29)
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30. A cutting tool for removing relatively hard abnormal deposits positioned adjacent to relatively soft body tissues, comprising;
a generally cylindrical symmetric body having at least one cutting blade projecting therefrom, said cutting blade being substantially exposed, and attaching means at one end thereof for securing said cutting tool to a rotating drive shaft, said cutting blade having a cutting face intersecting an outer surface of said body at an angle causing fracture of said abnormal deposits without cutting said body tissues at the frequency that said tool is adapted to rotate. - View Dependent Claims (31, 32)
Specification