초록 ▼

An improved disposable biopsy needle unit (12) includes a metal cannula (16), a molded plastic T-shaped handle (18), and a removable stylet (20). A solid hub portion (28) of the handle (18) is formed around a lateral tab (30) near the proximal end of the cannula (16) for reinforcement. A hollow fitt

An improved disposable biopsy needle unit (12) includes a metal cannula (16), a molded plastic T-shaped handle (18), and a removable stylet (20). A solid hub portion (28) of the handle (18) is formed around a lateral tab (30) near the proximal end of the cannula (16) for reinforcement. A hollow fitting (32) extends between the proximal end of the cannula (16) and a recess between the opposite wing portions (26) of the handle (18). Locking ears (48) are preferably provided on the fitting (32) for releasable attachment to an aspiration device, such as a syringe (14). The stylet (20) includes a solid needle (34) with a turned proximal end within a molded plastic cap (38) for reinforcement. A lug (44) and slot (46) are provided on the stylet (20) and handle (18), respectively, for properly locating the stylet when inserted into the cannula (16). A second embodiment (80) incorporates an upset, non-circular boss (82) on the fitting (32′) instead of a tab (30) on the cannula (16′) for internal reinforcement.

대표청구항 ▼

A biopsy needle unit, comprising: a straight cannula of substantially uniform cylindrical configuration over the major portion of its length and having distal and proximal ends, the distal end being tapered and bevelled; a tapered hollow fitting having distal and proximal ends with the distal end be

A biopsy needle unit, comprising: a straight cannula of substantially uniform cylindrical configuration over the major portion of its length and having distal and proximal ends, the distal end being tapered and bevelled; a tapered hollow fitting having distal and proximal ends with the distal end being connected to the proximal end of said cannula in coaxial relationship to define a longitudinal bore therethrough; a handle of generally T-shape having a distal end defining a central hub portion, and a proximal end defining oppositely extending lateral wing portions with a transverse recess between the wing portions opposite the hub portion; the hub portion of said handle being formed about the adjacent connected proximal and distal portions of said cannula and said fitting, respectively, with the proximal end of said fitting being disposed completely with in the recess of said handle and not extending beyond proximal surfaces of the wing portions; a removable stylet disposed in said cannula and said fitting; said stylet including a straight solid needle with a bevelled distal end and a turned proximal end, with a cap secured to the proximal end of the needle; the wing portions of said handle and the cap of said stylet having rounded proximal surfaces for manual comfort; means for releasably securing said stylet and said handle against relative rotational movement; and means defining structure secured between said cannula and said fitting within the hub portion of said handle for reinforcement against pushing and twisting forces during insertion of the biopsy needle unit.