Biopsy needle

• US 5,718,237 A
• Filed: 03/30/1995
• Issued: 02/17/1998
• Est. Priority Date: 11/15/1993
• Status: Expired due to Term

• Current Assignee: John R. Haaga
• Original Assignee: John R. Haaga
• Inventors: Haaga, John R.
• Primary Examiner(s): Rimell, Sam
• Application Number:
  US08/413,384
• Time in Patent Office: 1,055 Days
• Field of Search: 604/265, 128/DIG. 8, 128/751, 128/752, 128/753, 128/754, 128/755, 128/8, 606/229
• US Class Current: 600/564
• CPC Class Codes: A61B 10/0275 with sample notch, e.g. on the side of inner stylet
• CPC Class Codes: A61B 17/0057 Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect sutures A61B17/04; closing rectum or urethra near body surface A61F2/0009
• CPC Class Codes: A61B 2017/00637 for sealing trocar wounds through abdominal wall
• CPC Class Codes: A61B 2017/00654 entirely comprised between the two sides of the opening
• CPC Class Codes: Y10S 128/08 Collagen

Abstract

A biopsy needle has coaxial, telescopically interengaged stylet, inner and outer cannulas which are axially and rotatably displaceable relative to one another. The stylet has a distal portion provided with a cutting recess for severing a biopsy specimen from a site in a patient, and the inner cannula has a distal portion for cutting and capturing the specimen in the recess for removal from the site upon withdrawal of the needle from the patient. The distal portion of the inner cannula is partially cut away to provide an insert recess which supports a semi-circular insert of hemostatic collagen which remains at the site upon removal of the needle to minimize hemorrhagic complications by promoting blood clotting. The insert and the distal portion of the inner cannula have radially outer surfaces of corresponding radius whereby the distal portion of the inner cannula and the insert supported thereon are received within the distal end of the outer cannula prior to use of the needle.

Claims

1. A hemostatic sheath in combination with a medical device for accessing a body site within a human patient, said sheath initially disposed in an unapplied position within said device and slidable, relative to said device, to protrude from said device in an applied position and engage the margins of said site, said sheath comprising a hollow, cylindrical plug having a longitudinally extending axis and a longitudinally extending opening along said axis, said plug being arcuate transverse said axis and having circumferentially spaced apart axially extending side edges and means for occluding and preventing the flow of blood from said site when exposed to fluid from said site thereby minimizing complications from bleeding.

3. The hemostatic sheath of claim 1, wherein said hemostatic sheath is comprised of collagen.

4. The hemostatic sheath of claim 1, wherein said hemostatic sheath includes thrombin.

2. A hemostatic sheath in combination with a medical device for accessing a body site within a human patient, said sheath initially disposed in an unapplied position within said device and slidable, relative to said device, to protrude from said device in an applied position and engage the margins of said site, said sheath comprising a hollow, cylindrical plug having a longitudinally extending opening along its length whereby fluid from said site causes said sheath to occlude said site thereby minimizing complications from bleeding, said sheath including a longitudinally extending axis, said sheath being shaped in the form of a hollow shaped half-moon transverse to said axis.

5. A hemostatic sheath for use with an axially extending medical device for accessing a site of a body within a human patient, said medical device including means for inserting said sheath at said site and means for causing relative sliding movement between said sheath and said device, said sheath comprising a semi-cylindrical shaped plug having a circumferentially extending exterior cylindrical wall and a circumferentially extending interior cylindrical wall, said walls connected by circumferentially spaced apart side edges and a swellable material for causing said sheath to swell to prevent the flow of blood from said site when exposed to fluid from said site.

6. The hemostatic sheath of claim 5, wherein said means for inserting said sheath includes an elongated member, said interior cylindrical wall disposed on said elongated member.