An intercostal retractor is used during an open heart surgical procedure to spre

Question

An intercostal retractor is used during an open heart surgical procedure to spread the ribs and incision of the intercostal space as shown in the figure below; and the magnitude of the force F acting on point A of the retractor blade is approximately 165 [N]. Calculate the torque about point B on the retraction control due to the force F acting on point A of the retractor blade. 8.25 [N.m] out of the page 14.9 [N.m] out of the page 12.0 [N.m] into the page 14.9 [N.m] into the page 12.0 [N.m] out of the page

Explanation / Answer

Torque = rxF

F = 165 N

r = -5 i - 9 j

F = -165 i N

torque = rxF

= (5i + 9j)x165 i

= - 165*9 k N-cm

= -14.9 k N-m

-ve sign means direction is into the page.

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