# US 11,026,832 B2 · Intrauterine device with a restricted upward movement of a string > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,026,832 B2 - Document ID: US11026832B2 - Status: Granted - Kind: B2 - Application number: 15/576,362 - Filed: 2015-07-16 - Published: 2018-05-31 - Granted: 2021-06-08 - Earliest claimed: 2015-05-30 - Assignees: Pregna International Limited - Applicants: Pregna International Limited - Inventors: Ajit Raje; Usha Kumar - Web page: https://patentgrep.com/patent/US11026832B2 ## CPC - A61F 6/18: Inserters or removers - A61F 6/144: {with T-configuration} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract An intrauterine device (IUD) with a restricted movement of a string(s), the strings can be either a single string or two or more strings or a filament, emerging from the spherical bulge of IUD. The strings of IUD are of a differential strength so that the strings are soft and the hanging portion of the strings, “feelable” in the vaginal cavity, does not cause discomfort to the woman, nor bruise the organ of the partner during intercourse, at the same time the strings in the endocervical canal are relatively stiffer and not have the tendency to get curled up progressively. The strings optionally have marks to facilitate cutting by a surgeon to an accurate length. ## Claims ### Claim 1 An intrauterine device with a restricted upward movement of a plurality of strings, having an elongated central vertical stem of an order of 29 to 35 mm in length with a plurality of arms attached on a proximal end of the central vertical stem and a spherical bulge attached on a distal end of the central vertical stem, wherein the plurality of strings are terminated together on one end at the spherical bulge, and each of the plurality of strings has an opposite, unterminated end that together form a hanging portion of said plurality of strings configured to suspend freely from the spherical bulge in the vaginal cavity, and an envelope directly connected to the spherical bulge by at least covering the spherical bulge and wherein the envelope has sealed ends to prevent harboring of infection, and wherein the envelope is disposed around the hanging portion of the plurality of strings emerging from below the spherical bulge to achieve an enhanced stiffness fora projected length of the hanging portion of plurality of strings proximal to the attachment to the spherical bulge, with the hanging portion of plurality of strings extending away from the spherical bulge and beyond said envelope without retention between the envelope and the unterminated ends of the hanging portion of strings, and configured to remain inside the endocervical canal so as to restrict the upward movement of the plurality of strings in the uterus. ### Claim 2 (depends on 1) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 1, wherein said envelope around the plurality of strings is a tubular extension of the spherical bulge. ### Claim 3 (depends on 2) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 2, wherein said tubular extension is curvilinear. ### Claim 4 (depends on 2) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 2, wherein said tubular extension is straight. ### Claim 5 (depends on 2) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 2, wherein said tubular extension is of such length that the tubular extension is configured to ends above the internal cervical os. ### Claim 6 (depends on 2) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 2, wherein said tubular extension is of such length that the tubular extension is configured to partially enters the endocervical canal. ### Claim 7 (depends on 1) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 1, wherein said envelope around the plurality of strings is a springy curvilinear extension of the spherical bulge and the plurality of strings is fenced around by the springy curvilinear extension. ### Claim 8 (depends on 7) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 7, wherein said springy curvilinear extension is of such a length that the springy curvilinear extension is configured to ends above the internal cervical OS. ### Claim 9 (depends on 7) The intrauterine device with then restricted movement of the plurality of strings as claimed in claim 7, wherein said springy curvilinear extension is of such a length that the springy curvilinear extension is configured to partially enters the endocervical canal. ### Claim 10 (depends on 1) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 1, wherein said envelope around the plurality of strings is a stretchable hollow tube of the spherical bulge and the plurality of strings is guided by the stretchable hollow tube. ### Claim 11 (depends on 10) The intrauterine device with the restricted movement of the plurality of strings as claimed in claim 10, wherein said stretchable hollow tube at least covers the spherical bulge. ### Claim 12 (depends on 10) The intrauterine device with then restricted movement of the plurality of strings as claimed in claim 10, wherein said stretchable hollow tube covers beyond the spherical bulge towards the proximal end having a copper winding or a drug chamber. ### Claim 13 (depends on 10) The intrauterine device with then restricted movement of the plurality of strings as claimed in claim 10, said stretchable hollow tube is of such a length that the stretchable hollow tube is configured to ends above the internal cervical os. ### Claim 14 (depends on 10) The intrauterine device with then restricted movement of the plurality of strings as claimed in claim 10, said stretchable hollow tube is of such a length that the stretchable hollow tube is configured to partially enters the endocervical canal.