Source: http://www.google.com/patents/US6558406?dq=6,263,507
Timestamp: 2014-03-16 04:57:14
Document Index: 60048693

Matched Legal Cases: ['arts 33', 'arts 30', 'arts 30', 'arts 30', 'arts 30', 'arts 33', 'arts 33']

Patent US6558406 - Vein filter - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA vein filter having improved collectability of chyme blood or thrombi and stability of indwelling. The filter includes at least 3 wires radially spreading backward of a head member and connected such that the intervals between any adjacent two wires are connected with threads of an equal length at a...http://www.google.com/patents/US6558406?utm_source=gb-gplus-sharePatent US6558406 - Vein filterAdvanced Patent SearchPublication numberUS6558406 B2Publication typeGrantApplication numberUS 09/812,679Publication dateMay 6, 2003Filing dateMar 21, 2001Priority dateMar 23, 2000Fee statusLapsedAlso published asDE60105472D1, DE60105472T2, EP1138277A1, EP1138277B1, US20010025187Publication number09812679, 812679, US 6558406 B2, US 6558406B2, US-B2-6558406, US6558406 B2, US6558406B2InventorsMasayosi OkadaOriginal AssigneeNipro CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (3), Classifications (10), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetVein filterUS 6558406 B2Abstract A vein filter having improved collectability of chyme blood or thrombi and stability of indwelling. The filter includes at least 3 wires radially spreading backward of a head member and connected such that the intervals between any adjacent two wires are connected with threads of an equal length at a substantially equal distance from the head member. At respective connection parts where the threads are connected to the wires, hook parts to be hooked on the inner wall of a blood vessel are provided. The head member is on the apex of a shaft extending back and the rear end of each wire is connected to a slide member slidable along the shaft. The wires are preferably made of shape memory alloy or stainless spring steel.
FIELD OF THE INVENTION The present invention relates to a vein filter for preventing pulmonary infarction and which is mainly indwelt in the inferior caval vein.
DESCRIPTION OF THE RELATED ART Recently, as the number of elderly persons of advanced age has increased in society, more attention has been paid to an increase in vein diseases as well as to an increase in arterial sclerosis. Vein diseases have not been given as much importance as arterial diseases. However, high attention has recently come to be paid to their importance. This is because when deep vein thrombosis occurs, a part of it is released and flows into the pulmonary artery to induce thromboembolism of the pulmonary artery, and as a result severe respiratory failure is caused. Once pulmonary artery thromboembolism occurs, the prognosis in many cases is very poor and there is a high risk of death unless an effective therapeutic means is applied.
SUMMARY OF THE INVENTION The present invention is a vein filter which comprises a head member, at least three wires of equivalent length, the wires having front ends fixed to the head member, the wires extending radially from the head member backward, a connection part comprising threads of substantially equivalent length, each connecting two adjacent wires at a position an equivalent distance from the head member, and a hook part provided on the connection part for hooking onto an inner wall of a blood vessel to fix the filter.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the vein filter of the present invention
FIG. 2 is a cross-sectional view of the vein filter of the present invention along the line A�A in FIG. 1.
FIGS. 4(a) and 4(b) illustrate an enlarged view of an apex portion of a shaft of the vein filter of the present invention shown in FIG. 1, with FIG. 4(a) being a top view and FIG. 4(b) being a longitudinal cross-sectional view along the line C�C.
FIGS. 5(a) and 5(b) illustrate the circumference of the head member of the vein filter of the present invention shown in FIG. 1, with FIG. 5(a) being a longitudinal cross-sectional view and FIG. 5(b) being a horizontal cross-sectional view along the line B�B.
DETAILED DESCRIPTION OF THE INVENTION As used herein, �forward� means the direction toward the head member 12 and �backward� means the direction departing from the head member 12.
FIG. 1 is a perspective view showing a preferred embodiment of the vein filter of the present invention. FIG. 2 is a cross-sectional view along the line A�A of FIG. 1. A vein filter 10 comprises a head member 12, an annular slide member 16, a shaft 13 which extends backward from the head member 12 and slidable penetrates and moves through a circular hole in the slide member 16 six wires 14 each having the same length, and six threads 18 each having the same length. Each wire 14 has a front end fixed the head member 12 and a rear end fixed to the slide member 16 and is bent in an arcuate form, thus forming as a whole a cylindrical or conical vein filter 10. Adjacent wires 14 are connected with each other by one of the threads 18 of substantially the same length at positions the same distance from the head member 12, so that the six threads 18 form a regular hexagon. At respective connection parts 33 connecting wires 14 with threads 18 hook parts 30 are provided for hooking onto the inner wall of blood vessel to anchor the vein filter 10 in the inside of a blood vessel. The diameter or thickness of the hook parts 30 is preferably on the order of 0.1 mm to 0.3 mm. The length of the hook parts 30 is preferably on the order of 0.3 mm to 1.0 mm. The hook parts 30 can be attached to connection parts 33 extending outwardly from the wires 14 by welding onto the connection parts 33 or by bending and cutting a knot of the wires 14.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4643184Apr 17, 1984Feb 17, 1987Mobin Uddin KaziEmbolus trapUS4793348Nov 15, 1986Dec 27, 1988Palmaz Julio CBalloon expandable vena cava filter to prevent migration of lower extremity venous clots into the pulmonary circulationUS5234458 *Jun 12, 1991Aug 10, 1993AntheorFilter device intended to prevent embolismsUS5375612 *Mar 30, 1993Dec 27, 1994B. Braun CelsaPossibly absorbable blood filterUS5683411 *Apr 6, 1995Nov 4, 1997William Cook Europe A/SMedical article for implantation into the vascular system of a patientUS5941896 *Dec 16, 1997Aug 24, 1999Montefiore Hospital And Medical CenterFilter and method for trapping emboli during endovascular proceduresUS5954742 *Mar 14, 1997Sep 21, 1999Osypka; PeterDilatation catheterUS6193739 *Aug 4, 1998Feb 27, 2001B. Braun CelsaAssembly comprising a blood filter for temporary or definitive use and a device for implanting it, corresponding filter and method of implanting such a filterUS6231589 *Mar 22, 1999May 15, 2001Microvena CorporationBody vessel filterUS6273900 *Jan 16, 1998Aug 14, 2001Boston Scientific CorporationBlood clot filteringUS6273901 *Aug 10, 1999Aug 14, 2001Scimed Life Systems, Inc.Thrombosis filter having a surface treatment* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7846175Apr 3, 2006Dec 7, 2010Medrad, Inc.Guidewire and collapsable filter systemUS8486082 *Dec 5, 2007Jul 16, 2013Replication Medical, Inc.Apparatus for dimensioning circumference of cavity for introduction of a prosthetic implantUS20080147076 *Dec 5, 2007Jun 19, 2008Replication Medical, Inc.Apparatus for dimensioning circumference of cavity for introduction of a prosthetic implant* Cited by examinerClassifications U.S. Classification606/200International ClassificationA61F2/01, A61M1/36Cooperative ClassificationA61F2002/016, A61F2230/005, A61F2230/0093, A61F2230/008, A61F2230/0067, A61F2/01European ClassificationA61F2/01Legal EventsDateCodeEventDescriptionJun 28, 2011FPExpired due to failure to pay maintenance feeEffective date: 20110506May 6, 2011LAPSLapse for failure to pay maintenance feesDec 13, 2010REMIMaintenance fee reminder mailedOct 13, 2006FPAYFee paymentYear of fee payment: 4May 14, 2001ASAssignmentOwner name: NIPRO CORPORATION, JAPANFree format text: CHANGE OF NAME;ASSIGNOR:NISSHO CORPORATION;REEL/FRAME:011804/0311Effective date: 20010402Owner name: NIPRO CORPORATION KITA-KU, OSAKA-SHI 9-3, HONJO-NIFree format text: CHANGE OF NAME;ASSIGNOR:NISSHO CORPORATION /AR;REEL/FRAME:011804/0311Mar 21, 2001ASAssignmentOwner name: NISSHO CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OKADA, MASAYOSI;REEL/FRAME:011632/0039Effective date: 20010316Owner name: NISSHO CORPORATION 9-3, HONJO-NISHI 3-CHOME, KITA-Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OKADA, MASAYOSI /AR;REEL/FRAME:011632/0039RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google