Orthopedic Device Delivering a Controlled, Repeatable Impact

Patent metadata

Field	Value
Publication number	US-2018338751-A1
Application number	US-201715789493-A
Country	US
Kind code	A1
Filing date	Oct 20, 2017
Priority date	May 26, 2017
Publication date	Nov 29, 2018
Grant date	—

Abstract

In an illustrative embodiment, a motor-driven orthopedic impacting tool for orthopedic impacting in the hips, knees, shoulders and the like may be capable of holding a surgical implement such as a broach, chisel, or other end effector, which when gently tapped in a cavity with controlled percussive impacts, can expand the size or volume of an opening of the cavity or facilitate removal of the surgical implement from the opening. A stored-energy drive mechanism may store potential energy and then release it to launch a launched mass or striker to communicate a striking force to an adapter in either a forward or reverse direction. The tool may further include a combination anvil and adapter and an energy adjustment mechanism to adjust the striking force the launched mass delivers to the adapter.

First claim

1 .- 14 . (canceled)

15 . A surgical impacting tool, comprising:
an energy storage and release mechanism comprising
a spring assembly comprising a spring element, and
a cam assembly comprising a rotary cam mechanism and a helical drive mechanism, wherein
the rotary cam mechanism rotates to compress and release the spring element to generate an impact force,

wherein the energy storage and release mechanism is configured to release energy stored therein to drive an operably linked surgical implement;
a controller configured to monitor and manage storage and release of the energy storage and release mechanism; an adapter to secure the surgical implement; and a means for delivering the impact force responsive to the released energy to the surgical implement.

16 . The surgical impacting tool of claim 15 , wherein the energy storage and release mechanism is configured to release energy stored therein at a rate of between 1 and 10 times per second.

17 . The surgical impacting tool of claim 15 , wherein the spring assembly comprises a replaceable spring cartridge.

18 . The surgical impacting tool of claim 15 , wherein the helical drive mechanism comprises a worm gear.

19 . The surgical impacting tool of claim 15 , wherein the rotary cam mechanism comprises a barrel cam.

20 . The surgical impacting tool of claim 15 , further comprising a mechanical trigger mechanism for activating the controller.

21 . The surgical impacting tool of claim 18 , wherein the rotary cam mechanism comprises a cam follower, wherein rotation of the rotary cam mechanism pushes the cam follower against the spring element and releases the cam follower from the spring element.

22 . The surgical impacting tool of claim 21 , wherein the cam follower slides on a helicoid surface of the worm gear from a first worm end to a second worm end as the rotary cam mechanism rotates.

23 . The surgical impacting tool of claim 15 , wherein the spring element comprises a mechanical spring having a compression ratio of less than 50% of a free length of the mechanical spring.

24 . The surgical impacting tool of claim 15 , wherein the controller, after the delivery of the impact force, is adapted to stop the rotary cam mechanism in a position where at least part of the potential energy has been stored by the energy storage and release mechanism, thereby providing a latency upon activation of the surgical impacting tool of up to about 100 milliseconds.

25 . The surgical impacting tool of claim 15 , wherein the means for delivering the impact force comprises a means for delivering both a forward impact force and a reverse impact force, wherein the reverse impact force is equal or greater to the forward impact force.

26 . The surgical impacting tool of claim 15 , wherein the means for delivering the impact force comprises a striker activated by a piston, wherein the piston is actuated by the energy storage and release mechanism.

27 . The surgical impacting tool of claim 26 , wherein the piston, upon actuation, comes to rest on a bumper element.

28 . The surgical impacting tool of claim 26 , wherein a ratio of a weight of the striker to a combined weight of the adapter and the surgical implement secured therein is less than 25%.

Assignees

• Depuy Synthes Products Inc

Inventors

• Pedicini Christopher

Classifications

• A61B5/4528

  Joints (A61B5/4533, A61B5/4538 take precedence) · CPC title

• A61B2017/922

  Devices for impaction, impact element · CPC title

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61F2002/4681

  by applying mechanical shocks, e.g. by hammering · CPC title

• A61F2/4607

  of hip femoral endoprostheses · CPC title