Percutaneous aspiration lung biopsy needle assembly

US4799494A · kind A · utility

Inventor

• Ko Pen Wang · Pikesville, US

Key dates

• Filing date: Oct 22, 1986
• Grant date: Jan 24, 1989
• Expiry date: Oct 22, 2006

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B2217/005
• WIPO field: Medical technology
• WIPO sector: Instruments

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.