The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1989
Filed:
Oct. 22, 1986
Ko P Wang, Stevenson, MD (US);
Other;
Abstract
Percutaneous aspiration lung biopsy needle assembly comprises a hollow outer needle in which a second hollow needle of smaller diameter is disposed, the second inner needle being retractable from a first extended position to a second retracted position within the first needle. The inner needle, which extends for only a portion of the distance has a bevelled tip and is constructed such that its outer diameter closely matches the inner diameter of the outer needle. When the inner needle is in its extended position the needle assembly may be forced through the skin and into the lung with relative ease. Subsequently, the inner needle is retracted so that only the flat-tipped duller edged outer needle is exposed, thereby allowing a large tissue sample, suitable for histological examination, to be obtained. A pressure monitor is engaged with the needle apparatus to more accurately determine when lung and tumor entries are achieved. The assembly minimizes the risk of pneumothorax, excessive bleeding and embolism, and additionally allows continuous fluoroscopy of the target site without exposure of the physician's hand to x-rays.