# US 8,465,492 B2 · Chuck for reciprocating surgical instrument > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,492 B2 - Document ID: US8465492B2 - Status: Granted - Kind: B2 - Application number: 12/165,305 - Filed: 2008-06-30 - Published: 2009-12-31 - Granted: 2013-06-18 - Earliest claimed: 2008-06-30 - Assignees: Medtronic Xomed, Inc. - Applicants: Larry D. Estes - Inventors: Larry D. Estes - Web page: https://patentgrep.com/patent/US8465492B2 ## CPC - A61B 17/162: {Chucks or tool parts which are to be held in a chuck} - A61B 17/144: {with cutting edges at the side of the saw blades} - A61B 17/1615: {Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material} - A61B 17/1659: {Surgical rasps, files, planes, or scrapers} - B23B 31/10741: {Retention by substantially radially oriented pins} - B23D 51/10: for hand-held or hand-operated devices - A61B 17/1671: {for the spine} - A61B 2017/00464: {for use with different instruments} - A61B 2017/00477: {Coupling (A61B2017/0046 takes precedence)} - A61B 2017/320028: {with reciprocating movements} - Y10T 279/17666: Radially reciprocating jaws - Y10T 279/17717: Rotary eccentric-cam sleeve - Y10T 279/17777: Sleeved - Y10T 279/17803: Rotary cam sleeve - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Devices are described relating to the retaining of surgical tools within the chuck of a reciprocating surgical instrument, such as a reciprocating saw. A securing chuck is disclosed for securing a surgical tool to a reciprocating surgical instrument that comprises a shaft and a securing member. The shaft defines an axis and has a cylindrical bore extending along the axis. The bore is shaped to receive a substantially rounded tool shank. A pair of transverse slots extends into the shaft along a plane passing through the axis for receiving a substantially flattened tool shank. The transverse slots intersect with the cylindrical bore. The securing member is carried by the shaft and is radially movable relative to the bore both inwardly and outwardly to secure the surgical tool in the chuck. ## Claims ### Claim 1 A system for treating a tissue structure during a surgical procedure, comprising: a reciprocating surgical instrument, comprising: a motor having a rotatable spindle; a transmission mounted to the spindle for converting rotating movement of the spindle to reciprocating movement; a surgical tool chuck coupled to the transmission, the chuck comprising: a receiving shaft defining a longitudinal axis and having a tool receptacle and a radially extending proximal opening; a locking member slidingly coupled to the receiving shaft, the locking member having a protrusion extending therefrom; a camming sleeve rotatingly retained on the shaft, the camming sleeve having first and second internal surface portions, the first surface portion having an internally cammed surface, the second surface portion having a circumference equally spaced from the axis with at least one detent formed therein; a rotation maintaining mechanism comprising a detent and a locking element that selectively engages the detent, the locking mechanism being at least partially disposed in the second surface portion of the camming sleeve; and a surgical tool having a distal end and a proximal end, the proximal end configured to be received into the tool receptacle, the surgical tool having an aperture disposed to correspond with the radially extending proximal opening of the receiving shaft when the surgical tool is disposed in the tool receptacle, wherein the locking member is selectively moveable between a first position and a second position, the first position wherein the protrusion is withdrawn from the proximal opening of the receiving shaft to allow insertion and removal of the surgical tool, the second position wherein the protrusion is substantially received within the proximal opening of the receiving shaft and the aperture in the surgical tool to secure the surgical tool within the chuck, the cammed surface configured to urge the protrusion into the second position and the rotation maintaining mechanism configured to maintain the camming sleeve in a position maintaining the protrusion in the second position. ### Claim 2 (depends on 1) The system of claim 1, further comprising a spring coupled to the shaft and disposed to bias the protrusion toward the first position. ### Claim 3 (depends on 2) The system of claim 2 wherein the locking member has a head portion with an inner surface, the protrusion extending therefrom, the head portion having a length dimension wider than the protrusion, the inner surface having at least one spring engagement feature for engaging the spring. ### Claim 4 (depends on 1) The system of claim 1 wherein the tool receptacle comprises a cylindrical bore in the shaft to receive a surgical tool with a substantially cylindrical shank. ### Claim 5 (depends on 4) The system of claim 4 wherein the surgical tool has a shank with first and second diameters, the first diameter sized to substantially fill the cylindrical bore and the second diameter representing a reduced thickness configured to reduce a travel distance of the protrusion between the first and second positions, thereby reducing an overall profile of the chuck. ### Claim 6 (depends on 1) The system of claim 1 wherein the camming surface is directed radially inward and slidingly contacts the locking member, the camming surface being radially graduated to provide a radially enlarged portion and a radially reduced portion so that the locking member is selectively moveable radially between its first and second positions as the camming sleeve is rotated about the longitudinal axis. ### Claim 7 (depends on 1) The system of claim 1 wherein rotating the camming sleeve through 180 degrees completely translates the protrusion between the first position and the second position. ### Claim 8 (depends on 4) The system of claim 4 wherein the surgical tool has an offset shank including a first portion generally aligned with the longitudinal axis and a second portion generally aligned with an offset axis, the offset axis being generally parallel to the longitudinal axis and offset from the longitudinal axis by an offset distance. ### Claim 9 (depends on 1) The system of claim 1 wherein the surgical tool chuck is key-less. ### Claim 10 (depends on 1) The system of claim 1 wherein the surgical tool has a shank, the shank having an anti-rotation feature and an anti-pullout feature for securing the tool in a key-less chuck, the aperture having a pair of side walls having a length, a width between the pair of side walls, and a proximal end wall, the side wall length being greater than the width between the pair of side walls, wherein the anti-rotation feature is at least one of a flattened shank edge and the pair of sidewalls and wherein the anti-pullout feature is the proximal end wall. ### Claim 11 (depends on 1) The system of claim 1 wherein the surgical tool aperture is one of an hourglass shape, an asymmetrical shape, and a longitudinal offset. ### Claim 12 (depends on 1) The system of claim 1 further comprising a retainer sleeve arranged between the camming sleeve and the receiving shaft, the second surface portion of the camming sleeve rotatingly engaging the retainer sleeve, the retainer sleeve having a slot which is sized to permit movement of the protrusion between the first and second positions. ### Claim 13 (depends on 12) The system of claim 12 wherein the retainer sleeve and the receiving shaft include aligned transverse holes, wherein the locking element comprises: opposing balls slidingly arranged in aligned transverse holes of the retainer sleeve, the camming sleeve second surface portion including grooves configured to receive the balls when the camming sleeve grooves are aligned with the balls such that the camming sleeve is secured against free rotation by the balls; and a spring biasing the balls radially outwardly. ### Claim 14 (depends on 1) The system of claim 1 wherein the detent is formed within the camming sleeve second surface portion, and wherein the locking element is retained within the receiving shaft and biased radially outward to become disposed within the detent upon rotation of the camming sleeve to a predetermined position. ### Claim 15 (depends on 14) The system of claim 14 wherein the locking element becoming disposed in the detent creates at least one of tactile feedback and audible feedback to an operator. ### Claim 16 (depends on 1) The system of claim 1 further comprising a spring coupled to the receiving shaft to bias the locking element outwards. ### Claim 17 (depends on 1) The system of claim 1 wherein the locking element comprises a ball that selectively engages the detent. ### Claim 18 A system for treating a tissue structure during a surgical procedure, comprising: a reciprocating surgical instrument, comprising: a motor having a rotatable spindle; a transmission mounted to the spindle for converting rotating movement of the spindle to reciprocating movement; a surgical tool chuck coupled to the transmission, the chuck comprising: a receiving shaft defining a longitudinal axis and having a tool receptacle and a radially extending proximal opening; a locking member slidingly coupled to the receiving shaft, the locking member having a protrusion extending therefrom; a camming sleeve rotatingly retained on the shaft, the camming sleeve having an internally cammed surface; and a rotation maintaining mechanism configured to maintain the camming sleeve in a position maintaining the protrusion in a second position; and a first surgical tool and a second surgical tool both having a distal end and a proximal end, the proximal end configured to be received into the tool receptacle, the surgical tool having an aperture disposed to correspond with the radially extending proximal opening of the receiving shaft when the surgical tool is disposed in the tool receptacle, wherein the locking member is selectively moveable between a first position and a second position, the first position wherein the protrusion is withdrawn from the proximal opening of the receiving shaft to allow insertion and removal of the surgical tool, the second position wherein the protrusion is substantially received within the proximal opening of the receiving shaft and the aperture in the surgical tool to secure the surgical tool within the chuck, the cammed surface configured to urge the protrusion into the second position; wherein the tool receptacle comprises a cylindrical bore in the shaft to receive the first surgical tool having a substantially cylindrical shank, and wherein the tool receptacle further comprises a transverse slot extending through opposing sidewalls of the shaft configured to receive the second surgical tool having a substantially flattened shank, where the substantially flattened shank is flattened relative to the substantially cylindrical shank.