Axially reciprocating microsurgical instrument with radially compressed actuator handle
View Patent ↗A microsurgical instrument has a pair of operative surgical surfaces that are moved relative to each other in shearing or grasping procedures performed by the instrument. The instrument has a handle containing an elongate center rod with a ring mounted for reciprocating movement on the rod. A tube is secured to the ring and a shaft extends through the tube and is secured to the rod. The handle also includes a plurality of resilient arms that extend along the length of the rod and engage against a sliding surface of the ring on the rod. The plurality of actuator arms are alternatively manually compressed radially inwardly by the surgeon's hand and released by the surgeon's hand to allow the arms to flex radially inwardly and outwardly. The inward and outward movement of the plurality of arms reciprocates the ring on the handle rod and causes the tube and shaft to move axially relative to each other.
1. A surgical instrument comprising:
a rod having a length with opposite proximal and distal ends, the rod having a center axis that extends along the rod length and defines mutually perpendicular axial and radial directions relative to the surgical instrument;
a ring mounted on the rod for axially reciprocating movement between first and second positions of the ring on the rod, the ring being movable toward the rod proximal end to the first position of the ring on the rod and the ring being movable toward the rod distal end to the second position of the ring on the rod;
a handle on the rod, the handle having a plurality of arms that are circumferentially spaced around the rod with there being axially extending slots between adjacent arms of the plurality of arms, the plurality of arms extending axially from the rod proximal end along the rod to free distal ends of the arms that are radially outward of and surround the ring, each arm having an interior surface that opposes the rod and an opposite exterior surface, each arm having opposite side surfaces that extend radially between the interior and exterior surfaces of the arm, and at least portions of the opposite side surfaces of each arm merge inwardly toward each other as the opposite side surfaces extend radially from the interior surface to the exterior surface of the arm.
2. The surgical instrument of claim 1 , further comprising:
the opposite side surfaces of each arm having portions that are substantially parallel to each other as well as the portions that merge toward each other.
3. The surgical instrument of claim 1 , further comprising:
the portions of the opposite side surfaces of each arm that merge toward each other connect with the exterior surface of the arm.
4. The surgical instrument of claim 1 , further comprising:
the portions of the opposite side surfaces of each arm that merge toward each other are flat surfaces.
5. The surgical instrument of claim 1 , further comprising:
each arm of the plurality of arms has serrations across the exterior surface of the arm.
6. The surgical instrument of claim 1 , further comprising:
at least some of the free distal ends of the arms engage against the ring while the ring reciprocates on the rod between the first and second positions of the ring on the rod.
7. The surgical instrument of claim 1 , further comprising:
the free distal ends of the arms engaging in a sliding engagement with the ring.
8. The surgical instrument of claim 1 , further comprising:
each arm of the plurality of arms having a proximal end that is opposite the distal end of the arm and having a radial width dimension that is smallest at the arm proximal end.
9. The surgical instrument of claim 1 , further comprising:
the handle having a handle portion that is secured to the rod proximal end, the plurality of arms being monolithic extensions from the handle portion, and the slots between the adjacent arms extending axially from the free distal ends of the arms toward the handle portion but ending short of the handle portion.
10. The surgical instrument of claim 9 , further comprising:
the handle portion secured to the rod proximal end being an intermediate portion of the handle, and the handle having a rearward portion that extends from the handle intermediate portion axially away from the rod proximal end.
11. The surgical instrument of claim 1 , further comprising:
the handle having a handle portion that is mounted on the rod proximal end, and the plurality of arms extend from the handle portion mounted on the rod proximal end and cantilever over the rod.
12. The surgical instrument of claim 1 , further comprising:
a surgical instrument head on the rod distal end, the surgical instrument head having a center bore with a center axis that is coaxial with the rod center axis;
a surgical instrument tube received in the surgical instrument head center bore for axially reciprocating movement of the surgical instrument tube through the center bore, the surgical instrument tube having opposite proximal and distal ends with the proximal end being operatively connected to the ring for reciprocating movement of the surgical instrument tube and the ring relative to the surgical instrument head and the rod.
13. The surgical instrument of claim 12 , further comprising:
a surgical instrument shaft extending through the surgical instrument tube, the surgical instrument shaft having opposite proximal and distal ends with the distal end of the surgical instrument shaft projecting from the distal end of the surgical instrument tube and the proximal end of the surgical instrument shaft projecting from the proximal end of the surgical instrument tube and being secured stationary to the rod.