Embolectomy catheter

• US 4,030,503 A
• Filed: 11/05/1975
• Issued: 06/21/1977
• Est. Priority Date: 11/05/1975
• Status: Expired due to Term

• Current Assignee: William T. Clark III
• Original Assignee: William T. Clark III
• Inventors: Clark, William T. III
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US05/628,982
• Time in Patent Office: 594 Days
• Field of Search: 128/303 R, 128/304, 128/305 R, 128/311, 128/328, 128/341, 128/348-351, 128/356, 128/2 B, 15/104.16
• US Class Current: 606/159
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 2017/00685 Archimedes screw
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/320733 with a flexible cutting or scraping element, e.g. with a whip-like distal filament member
• CPC Class Codes: A61M 25/0069 Tip not integral with tube

Abstract

A spiral helix is affixed on the distal end of a flexible catheter.

Claims

1. A thrombolectomy catheter comprising

a flexible shaft having forward and rear ends,

a handle on the rear end of the shaft,

a wire having a forward extremity extending beyond the forward end of the flexible shaft,

a rounded blunt member on the forward extremity of the wire, and

a spiral helix surrounding the forwardly-projecting portion of the wire and extending rearwardly from the rounded blunt member the forward portion of said helix having a rounded forwardly-disposed surface, and said helix having a sharp rearwardly-disposed outer edge portion.

2. A thrombolectomy catheter as claimed in claim 1, said spiral helix comprising a wire secured to the rounded blunt member.

3. A thrombolectomy catheter as claimed in claim 2, the wire in at least a portion of the helix which is adjacent the rounded blunt member being of substantially round cross section.

5. A thrombolectomy catheter as claimed in claim 2, said helix having inwardly tapered opposite ends.

6. A thrombolectomy catheter as claimed in claim 1, said helix being a rigid screw.

7. A thrombolectomy catheter as claimed in claim 6, wherein at least some of the turns are slotted.

4. A thrombolectomy catheter comprising

a flexible shaft having forward and rear ends,

a handle on the rear end of the shaft,

a rounded blunt member on the forward extremity of the flexible shaft, and

a spiral helix extending rearwardly from the rounded blunt member on the forward end portion of said shaft, said spiral helix comprising a wire, said wire in at least a portion of the helix which is adjacent the rounded blunt member being of substantially round cross section, said wire in at least a portion of said helix which is adjacent the end thereof which is remote from the rounded blunt member having a flat outer side.

8. A thrombolectomy catheter comprising

a flexible shaft having forward and rear ends,

a handle on the rear end of the shaft,

a rounded blunt member on the forward extremity of the flexible shaft, and

a spiral helix extending rearwardly from the rounded blunt member on the forward end portion of said shaft, said helix being a rigid screw, wherein the turns of the screw which are adjacent the rounded blunt members are continuous and at least some of the turns which are remote from the solid blunt member are slotted.