# US 2019/0167326 A1 · Attachment device and method for use > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167326 A1 - Document ID: US20190167326A1 - Status: Published application - Kind: A1 - Application number: 16/033,029 - Filed: 2018-07-11 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: Stout Medical Group, L.P. - Applicants: Stout Medical Group, L.P. - Inventors: E. Skott GREENHALGH; Robert A. KIEFER - Web page: https://patentgrep.com/patent/US20190167326A1 ## CPC - A61B 17/8625: {Shanks, i.e. parts contacting bone tissue} - A61B 17/7032: {Screws or hooks with U-shaped head or back through which longitudinal rods pass} - A61B 17/7098: {wherein the implant is permeable or has openings, e.g. fenestrated screw (hollow surgical screws A61B17/864)} - A61B 17/8605: {Heads, i.e. proximal ends projecting from bone} - A61B 17/8635: {Tips of screws} - A61B 17/864: {hollow, e.g. with socket or cannulated} - A61B 17/8811: {characterised by the introducer tip, i.e. the part inserted into or onto the bone} - A61B 17/8685: {comprising multiple separate parts} - A61B 2017/00004: {(bio)absorbable, (bio)resorbable or resorptive} - A61B 2017/8655: {with special features for locking in the bone} - A61B 2090/037: {with a frangible part, e.g. by reduced diameter} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract Attachment devices and methods of using the same are disclosed. The attachment devices can be fenestrated. The fenestrations can control the flow of fluid out of and/or into the device. ## Claims ### Claim 1 A method for implanting an anatomical attachment device comprising: inserting the anatomical attachment device at least partially into a bone at a target site, wherein the attachment device has an attachment device lumen and an attachment device first fenestration in fluid communication with the attachment device lumen and the target site, and wherein a pressure reduction device is in the attachment device lumen, and wherein the pressure reduction device has a pressure reduction first fenestration; pressurizing a bone cement into the attachment device lumen, wherein the pressurizing comprises flowing bone cement through the attachment device lumen, then flowing the bone cement through the pressure reduction device first fenestration, then flowing the bone cement through the attachment device first fenestration, then flowing the bone cement into the target site; and wherein the pressure of the bone cement decreases when the bone cement passes through the pressure reduction first fenestration, and wherein the pressure reduction first fenestration is on a lateral side of the pressure reduction device, and wherein the pressure reduction device has a pressure reduction second fenestration on the lateral side of the pressure reduction device and at least 90° away from the pressure reduction first fenestration with respect to a longitudinal axis of the pressure reduction device. ### Claim 2 (depends on 1) The method of claim 1, wherein all of the pressure reduction fenestrations are longitudinally within the attachment device lumen when the bone cement is flowing through the pressure reduction device. ### Claim 3 (depends on 1) The method of claim 1, wherein the pressure reduction device is wholly within the anatomical attachment device lumen. ### Claim 4 (depends on 1) The method of claim 1, wherein the anatomical attachment device has a radially outward helical thread. ### Claim 5 (depends on 1) The method of claim 1, wherein the pressure reduction device has a pressure reduction third fenestration on a lateral side of the pressure reduction device and at a different longitudinal position than the pressure reduction first fenestration, and wherein the pressure reduction third fenestration is smaller in cross-sectional area than the pressure reduction first fenestration. ### Claim 6 (depends on 1) The method of claim 1, wherein the pressure reduction device comprises a metal tube. ### Claim 7 (depends on 1) The method of claim 1, wherein the pressure reduction device has a wall thickness less than 2 mm. ### Claim 8 A method for implanting a bone screw comprising: inserting the bone screw into a bone at a target site, wherein the bone screw has a helical thread, a bone screw lumen, and a bone screw first fenestration, and wherein a pressure reduction device is fixedly attached to or integral with the bone screw, and wherein the pressure reduction device is at least partially in the bone screw lumen, and wherein the pressure reduction device has a pressure reduction first fenestration on a lateral side of the pressure reduction device. ### Claim 9 (depends on 8) The method of claim 8, wherein the pressure reduction device has a pressure reduction second fenestration on the lateral side of the pressure reduction device and at least 90° away from the pressure reduction first fenestration with respect to a longitudinal axis of the pressure reduction device. ### Claim 10 (depends on 8) The method of claim 8, wherein all of the pressure reduction fenestrations are longitudinally within the attachment device lumen when the bone cement is flowing through the pressure reduction device. ### Claim 11 (depends on 8) The method of claim 8, wherein the pressure reduction device has a pressure reduction second fenestration on a lateral side of the pressure reduction device and at a different longitudinal position than the pressure reduction first fenestration, and wherein the pressure reduction third fenestration is smaller in cross-sectional area than the pressure reduction second fenestration. ### Claim 12 (depends on 8) The method of claim 8, wherein the pressure reduction device comprises a metal tube. ### Claim 13 (depends on 8) The method of claim 8, wherein the pressure reduction device has a wall thickness 2 mm or less. ### Claim 14 A method for implanting a bone screw comprising: fixedly attaching or integrating a pressure reduction device to the distal end of a syringe, wherein the pressure reduction device has a lateral pressure reduction first fenestration; inserting the bone screw into a target site, wherein the bone screw has a bone screw lumen, and a bone screw lateral fenestration; inserting the pressure reduction device into the bone screw lumen, wherein the inserting of the pressure reduction device comprises positioning at least a portion of the syringe adjacent to the bone screw lumen; delivering a bone cement from the syringe, through the pressure reduction device in the bone screw lumen, and through the bone screw lateral fenestration. ### Claim 15 (depends on 14) The method of claim 14, further comprising withdrawing the pressure reduction device out of the bone screw lumen, wherein the withdrawing of the pressure reduction device comprises moving at least a portion of the syringe away from the bone screw lumen. ### Claim 16 (depends on 14) The method of claim 14, wherein the pressure reduction device has a pressure reduction second fenestration on the lateral side of the pressure reduction device and at least 90° away from the pressure reduction first fenestration with respect to a longitudinal axis of the pressure reduction device. ### Claim 17 (depends on 14) The method of claim 14, wherein all of the pressure reduction fenestrations are longitudinally within the bone screw lumen when the bone cement is being delivered through the pressure reduction device. ### Claim 18 (depends on 14) The method of claim 14, wherein the pressure reduction device has a pressure reduction second fenestration on a lateral side of the pressure reduction device and at a different longitudinal position than the pressure reduction first fenestration, and wherein the pressure reduction third fenestration is smaller in cross-sectional area than the pressure reduction second fenestration. ### Claim 19 (depends on 14) The method of claim 14, wherein the pressure reduction device comprises a metal tube. ### Claim 20 (depends on 14) The method of claim 14, wherein the pressure reduction device has a wall thickness 2 mm or less.