MODIFIED VERESS NEEDLE FOR TENSION PNEUMOTHORAX DECOMPRESSION

摘要

Disclosed are devices and methods for treating tension pneumothorax. A needle assembly may include an outer cannula defining a lumen and having a distal end portion with a sharp bevel, and an inner cannula slidably-disposed through the lumen of the outer cannula. The inner cannula moves between an extended and retracted position and includes a blunt distal end portion configured to extend beyond the sharp bevel of the outer cannula when the inner cannula is in the extended position. The blunt distal end portion can retract within the lumen of the outer cannula when the inner cannula is in the retracted position, thereby exposing the sharp bevel. The needle assembly further includes a bias disposed inside the housing and coupled to the inner cannula. A proximal end portion of the inner cannula is configured to extend through the housing when the inner cannula is in the retracted position.

主权项

1. A needle assembly, comprising:
an outer cannula defining a lumen and having a proximal end portion and a distal end portion, the distal end portion comprising a sharp bevel facilitating insertion of the needle assembly into a subject; an inner cannula slidably disposed coaxially in the lumen of the outer cannula and being movable relative to the outer cannula between an extended position and a retracted position, the inner cannula defining a respective lumen and having a blunt distal end portion and a proximal portion, the blunt distal end portion extending beyond the sharp bevel of the outer cannula whenever the inner cannula is in the extended position and being at least partially retracted within the lumen of the outer cannula whenever the inner cannula is in the retracted position; a bias coupled to the inner cannula and outer cannula in a manner favoring automatic positioning of the inner cannula at the extended position unless the blunt distal end portion is experiencing a sufficient force to move the inner cannula automatically to the retracted position; and a visual indicator indicating to the user a disposition of the inner cannula relative to the retracted and extended positions.