# US 11,027,125 B2 · Interventional medical devices, device systems, and fixation components thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,027,125 B2 - Document ID: US11027125B2 - Status: Granted - Kind: B2 - Application number: 16/158,724 - Filed: 2018-10-12 - Published: 2019-02-14 - Granted: 2021-06-08 - Earliest claimed: 2016-01-21 - Assignees: Medtronic, Inc. - Applicants: Medtronic, Inc. - Inventors: Xin Chen; Michael D. Eggen; Vladimir Grubac; Brian P. Colin; Wei Gan; Thomas A. Anderson; Kathryn Hilpisch - Web page: https://patentgrep.com/patent/US11027125B2 ## CPC - A61N 1/0573: {chacterised by means penetrating the heart tissue, e.g. helix needle or hook} - A61N 1/362: Heart stimulators (heart defibrillators A61N1/39) - A61N 1/3756: {Casings with electrodes thereon, e.g. leadless stimulators} - A61N 1/37205: {Microstimulators, e.g. implantable through a cannula} - A61N 2001/058: {Fixing tools} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract A fixation mechanism of an implantable medical device is formed by a plurality of tines fixedly mounted around a perimeter of a distal end of the device. Each tine may be said to include a first segment fixedly attached to the device, a second segment extending from the first segment, and a third segment, to which the second segment extends. When the device is loaded in a lumen of a delivery tool and a rounded free distal end of each tine engages a sidewall that defines the lumen, to hold the tines in a spring-loaded condition, the first segment of each tine, which has a spring-biased pre-formed curvature, becomes relatively straightened, and the third segment of each tine, which is terminated by the free distal end, extends away from the axis of the device at an acute angle in a range from about 45 degrees to about 75 degrees. ## Claims ### Claim 1 A tissue penetrating fixation component for an implantable medical device (IMD), the component comprising: a base defining a longitudinal axis of the component and being configured to be fixedly attached to the IMD so that a perimeter of the component extends around an electrode of the IMD, and so that the longitudinal axis of the component is generally aligned along a longitudinal axis of the IMD; and a plurality of tines extending from the base and being spaced apart from one another around a perimeter thereof, and each tine of the plurality of tines comprising: a proximal portion being fixedly attached to the base, wherein the proximal portion extends from the base in a first direction, and wherein the proximal portion comprises a first pre-formed curvature; and a distal portion comprising: a proximal section extending from the first pre-formed curvature of the proximal portion in a second direction along a relatively straight line; a hook section comprising a second pre-formed curvature extending from the proximal section; and tip section extending from hook section toward the longitudinal axis to a free distal end. ### Claim 2 (depends on 1) The component of claim 1, wherein each tine has a constant thickness of about 0.005 inch and a width no less than about 0.02 inch. ### Claim 3 (depends on 2) The component of claim 2, wherein the width of each tine tapers from a greater width in proximity to the base to a lesser width in proximity to the hook section of the distal portion. ### Claim 4 (depends on 3) The component of claim 3, wherein the free distal end of each tine has an enlarged width relative to a remainder of the tip section of the corresponding distal portion. ### Claim 5 (depends on 1) The component of claim 1, wherein the first pre-formed curvature of the proximal portion of each tine is defined by a radius, when undeformed, within a range from about 0.06 inch and about 0.08 inch. ### Claim 6 (depends on 1) The component of claim 1, wherein the tip section of the distal portion of each tine has a length of about 0.06 inch. ### Claim 7 (depends on 1) The component of claim 1, wherein the proximal section of the distal portion of each tine has a length of about 0.1 inch. ### Claim 8 (depends on 1) The component of claim 1, wherein the second pre-formed curvature of the hook section of the distal portion of each tine is defined by a single radius, when un-deformed, being about 0.05 inch. ### Claim 9 (depends on 1) The component of claim 1, wherein the second pre-formed curvature of the hook section of the distal portion of each tine, when un-deformed, is defined by two radii and a straight length extending therebetween. ### Claim 10 (depends on 1) The component of claim 1, wherein the proximal section of the distal portion, when undeformed, extends along a relatively straight line that intersects the longitudinal axis at an acute first angle within a range from about 30 degrees and about 50 degrees. ### Claim 11 (depends on 10) The component of claim 10, wherein the acute first angle is about 45 degrees. ### Claim 12 (depends on 1) The component of claim 1, wherein the hook section, when undeformed, orients the tip section to enclose with the proximal section a second angle with in a range from about 70 degrees to about 120 degrees.