# US 8,784,405 B2 · Instrument tip assembly having self-threading back hub > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,784,405 B2 - Document ID: US8784405B2 - Status: Granted - Kind: B2 - Application number: 13/944,981 - Filed: 2013-07-18 - Published: 2013-11-14 - Granted: 2014-07-22 - Earliest claimed: 2012-04-19 - Assignees: Microline Surgical, Inc. - Applicants: Microline Surgical, Inc. - Inventors: Paul David Ryll; Peter Aliski - Web page: https://patentgrep.com/patent/US8784405B2 ## CPC - A61B 17/00234: {for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)} - A61B 17/29: Forceps for use in minimally invasive surgery - F16B 7/182: {for coaxial connections of two rods or tubes} - A61B 2017/2931: {with releasable head} - A61B 2017/294: {Connection of actuating rod to jaw, e.g. releasable} - A61B 2090/065: {for measuring contact or contact pressure} - A61B 2090/0814: {Preventing re-use} - Y10T 29/49826: Assembling or joining - Y10T 29/49881: of separate helix [e.g., screw thread] - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A actuating instrument including an instrument tip assembly having a yoke attachment thread. The actuating instrument also includes an actuator having an actuating shaft. The actuating shaft is provided with a first thread within the actuating shaft and a second thread provided on the actuating shaft. Further, the first thread is connected to the yoke attachment thread. Additionally, a back hub is provided at a proximal end of the instrument tip assembly and includes a rib or ribs provided on one of an inner surface and an outer surface of the back hub. The rib or ribs projecting from the one of the inner surface and the outer surface of the back hub and engages the second thread of the shaft to from an attachment thread. ## Claims ### Claim 1 An actuating instrument, comprising: an instrument tip assembly having a yoke attachment thread; an actuator having an actuating shaft, the actuating shaft having a first thread provided within the actuating shaft and a second thread provided on the actuating shaft, wherein the first thread is connected to the yoke attachment thread; and a back hub provided at a proximal end of the instrument tip assembly, the back hub having a rib provided on one of an inner surface and an outer surface of the back hub, wherein the rib comprises a plurality of circumferentially extending projections that are spaced apart from each other in a longitudinal direction of the back hub, wherein the rib projects from the one of the inner surface and the outer surface of the back hub, and wherein the rib engages the second thread of the shaft to form an attachment thread. ### Claim 2 (depends on 1) The actuating instrument according to claim 1, wherein the rib deforms upon engagement with the second thread to form the attachment thread. ### Claim 3 (depends on 1) The actuating instrument according to claim 1, wherein a surgical tool is provided at a distal end of the instrument tip assembly. ### Claim 4 (depends on 1) The actuating instrument according to claim 1, wherein the second thread is an exterior thread provided on an outer surface of the actuating shaft and the rib projects inwardly from the inner surface of the back hub to engage the exterior thread and form the attachment thread, the inner surface of the back hub receiving the exterior thread. ### Claim 5 (depends on 1) The actuating instrument according to claim 1, wherein the second thread is an internal thread provided within the actuating shaft at a front end of the first thread and the rib projects outwardly from the outer surface of the back hub to engage the internal thread and form the attachment thread, the internal thread receiving a portion of the back hub that is provided with the outwardly projecting ribs. ### Claim 6 (depends on 1) The actuating instrument according to claim 1, wherein the plurality of circumferentially extending projections are equally spaced apart in the longitudinal direction of the back hub. ### Claim 7 (depends on 1) The actuating instrument of claim 1, wherein the actuating instrument comprises a medical device. ### Claim 8 An instrument tip assembly for an actuating instrument, the instrument tip assembly comprising: a yoke attachment thread provided at a proximal end of the instrument tip assembly, the yoke attachment thread configured to be connected to a first thread provided within an actuating shaft of an actuator of an actuating instrument; a back hub provided at a proximal end of the instrument tip assembly, the back hub having a rib provided on one of an inner surface and an outer surface of the back hub, wherein the rib comprises a plurality of circumferentially extending projections that are spaced apart from each other in a longitudinal direction of the back hub, wherein the rib projects from one of the inner surface and the outer surface of the back hub, and wherein the rib is configured to engage with a second thread provided on the actuating shaft to form an attachment thread. ### Claim 9 (depends on 8) The instrument tip assembly according to claim 8, wherein the rib deforms upon engagement with the second thread to form the attachment thread. ### Claim 10 (depends on 8) The instrument tip assembly according to claim 8, wherein a surgical tool is provided at a distal end of the instrument tip assembly. ### Claim 11 (depends on 8) The instrument tip assembly according to claim 8, wherein the back hub and the rib are formed integrally and of a same material. ### Claim 12 (depends on 11) The instrument tip assembly according claim 11, wherein the material of the back hub has a greater hardness than the material of the rib. ### Claim 13 (depends on 8) The instrument tip assembly according to claim 8, wherein the back hub and the rib are formed integrally and of a different material. ### Claim 14 (depends on 8) The actuating instrument according to claim 8, wherein the second thread is an exterior thread provided on an outer surface of the actuating shaft and the rib projects inwardly from the inner surface of the back hub to engage the exterior thread and form the attachment thread, the inner surface of the back hub receiving the exterior thread. ### Claim 15 (depends on 8) The actuating instrument according to claim 8, wherein the second thread is an internal thread provided within the actuating shaft at a front end of the first thread and the rib projects outwardly from the outer surface of the back hub to engage the internal thread and form the attachment thread, the internal thread receiving a portion of the back hub that is provided with the outwardly projecting ribs. ### Claim 16 (depends on 8) The actuating instrument according to claim 8, wherein the plurality of circumferentially extending projections are equally spaced apart in the longitudinal direction of the back hub. ### Claim 17 (depends on 8) The instrument tip assembly of claim 8, wherein the instrument tip assembly is configured to be used in a medical device. ### Claim 18 A method of assembling an actuating instrument, the method comprising: providing an instrument tip assembly having a yoke attachment thread; providing an actuator having an actuating shaft, the actuating shaft having a first thread provided within the actuating shaft and second thread provided on the actuating shaft; providing a back hub at a proximal end of the instrument tip assembly, the back hub having a rib provided on one of an inner surface and an outer surface of the back hub, wherein the rib comprises a plurality of circumferentially extending projections that are spaced apart from each other in a longitudinal direction of the back hub, and wherein the rib projects from the one of the inner surface and the outer surface of the back hub; screwing the first thread onto the yoke attachment thread such that the back hub is drawn towards a proximal end of actuating shaft and the rib progressively engages the second thread of the shaft, thereby deforming the rib to form an attachment thread. ### Claim 19 (depends on 18) The method of assembling the medical device according to claim 18, wherein the rib is plastically deformed. ### Claim 20 (depends on 18) The method of assembling the actuating instrument of claim 18, wherein the actuating instrument comprises a medical device.