A disposable kerrison rongeur for cutting tissue, the kerrison rongeur comprising:
- a base, the base comprising:
- a handle portion, a body portion and a shaft portion;
- the shaft portion having a major elongation along an actuation axis and being made of a metal material, the shaft portion comprising:
- a slide support surface extending along the actuation axis;
- a foot portion located at a distal end of the slide support surface and extending transverse to the actuation axis;
- and
- a male mold-on interlock portion located at an end of the shaft portion opposite to the foot portion and having a contour and geometry configured to non-removably interlock with an over-molded plastic material;
- the body portion having a major elongation along the actuation axis and being made of the over-molded plastic material, the body portion comprising:
- an over-mold interlock portion that is over-molded onto and non-removably fixed onto the mold-on interlock portion of the shaft portion with the plastic material having an internal female contour and geometry that is married to the contour and geometry of the male mold-on interlock portion to be non-removably interlocked with the male mold-on interlock portion of the shaft portion;
- a slide support surface extending along the actuation axis, the slide support surface of the body portion being coplanar with the slide surface support of the shaft portion;
- a lever passageway extending through the body portion and having an opening through the slide support surface of the body portion;
- and
- a bearing bore extending through the body portion on a bore axis, the bearing bore transversely intersecting the lever passageway;
- and
- the handle portion being made of the over-molded plastic material and extending from the body portion of the base away from the shaft portion of the base and transverse to the actuation axis;
- an operable lever made of a plastic material and moveable relative to the base, the lever comprising:
- a pivot portion located within the lever passageway, the pivot portion having a bearing bore that is aligned with the bearing bore of the body portion, the pivot portion is pivotably movable relative to the body portion on the bore axis;
- a handle portion extending from the pivot portion and away from the body portion transverse to the actuation axis, the handle portion of the lever being movable relative to the handle portion of the base during pivot movement of the pivot portion relative to the body portion;
- and
- an actuator spur extending from the pivot portion past the opening through the slide support surface of the body portion, away from the body portion and transverse to the actuation axis, the actuator spur being movable relative to the body portion of the base during pivot movement of the pivot portion relative to the body portion, the movement of the actuator spur including a translational movement component along the actuation axis;
- a slide shaft having a major elongation along the actuation axis and being moveable relative to the base along the actuation axis, the slide shaft comprising:
- a distal portion and a proximal portion;
- the distal portion being made of a metal material, the distal portion comprising:
- a slide surface extending along the actuation axis and supported upon at least the slide support surface of the shaft portion of the base, the slide surface slides upon at least the slide support surface of the shaft portion of the base during movement of the slide shaft relative to the base;
- a cutting edge located to be opposed to the foot, the cutting edge being movable toward the foot to cut tissue located between the cutting edge and the foot;
- and
- a male mold-on interlock portion located at an end of the distal portion opposite to the cutting edge and having a contour and geometry configured to non-removably interlock with an over-molded plastic material;
- the proximal portion being made of a plastic material, the proximal portion comprising:
- a slide surface extending along the actuation axis and supported upon at least the slide support surface of the body portion of the base, the slide surface of the proximal portion of the slide shaft slides upon at least the slide support surface of the body portion of the base during movement of the slide shaft relative to the base;
- an actuator spur receptacle extending into the proximal portion from the slide surface of the proximal portion, the actuator spur and the actuator spur receptacle include cooperating surfaces configured to transmit a translational force from the actuator spur to the proximal portion during movement of the actuator spur;
- and
- an over-mold interlock portion that is over-molded onto and non-removably fixed onto the mold-on interlock portion of the distal portion with the plastic material of the proximal portion having an internal female contour and geometry that is married to the contour and geometry of the male mold-on interlock portion of the distal portion of the slide shaft to be non-removably interlocked with the male mold-on interlock portion of the distal portion.