US20010007947A1 - Vascular filtering device - Google Patents
Vascular filtering device Download PDFInfo
- Publication number
- US20010007947A1 US20010007947A1 US09/769,312 US76931201A US2001007947A1 US 20010007947 A1 US20010007947 A1 US 20010007947A1 US 76931201 A US76931201 A US 76931201A US 2001007947 A1 US2001007947 A1 US 2001007947A1
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- US
- United States
- Prior art keywords
- shaft
- distal end
- filtering device
- inflatable member
- passageway
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/22031—Gripping instruments, e.g. forceps, for removing or smashing calculi
- A61B17/22032—Gripping instruments, e.g. forceps, for removing or smashing calculi having inflatable gripping elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/01—Filters implantable into blood vessels
- A61F2/0105—Open ended, i.e. legs gathered only at one side
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2002/068—Modifying the blood flow model, e.g. by diffuser or deflector
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0003—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having an inflatable pocket filled with fluid, e.g. liquid or gas
Definitions
- the present invention relates to a device for capturing a debris or blood clots in a blood vessel, and more particularly, it relates to a vascular filtering device for capturing and removing the debris or blood clots used in, e.g. percutaneous transluminal coronary angioplasty (PTCA) procedure.
- PTCA percutaneous transluminal coronary angioplasty
- an inter-vascular treatment such as PTCA
- PTCA inter-vascular treatment
- a catheter which is provided with a balloon at a distal end thereof is inserted into a blood vessel which has a stenosis, and the balloon is inflated to enlarge the stenosis.
- a stent may be provided for preventing re-stenosis.
- debris or blood clots formed at the stenosis may be separated from the portion at the stenosis and migrate to other critical area, such as brain and pulmonary arteries, while the PTCA procedure is being performed.
- a device having a mesh or net may be disposed in the blood vessel, as proposed in U.S. Pat. No. 6,001,118.
- the net is inflated by various inflating means to catch emboli, but the net with the emboli may not be smoothly removed from the blood vessel after use.
- the present invention has been made in view of the above problem, and an object of the invention is to provide a vascular filtering device for removing debris or blood clots in the blood vessel of a patient during an operation, such as balloon dilation procedure.
- Another object of the invention is to provide a vascular filtering device as stated above, which can be easily delivered to a desired location in the blood vessel and removed therefrom after capturing the debris or blood clots.
- a further object of the invention is to provide a vascular filtering device as stated above, which is formed easily and is used as a guide wire or tube for other procedure.
- a vascular filtering device of the invention is basically formed of a flexible shaft, an inflatable member attached to the shaft, and a filter member attached to the inflatable member and the shaft.
- the flexible shaft has a side surface, a passageway extending inside the flexible shaft, and a side opening formed in the side wall at a distal end portion of the shaft to communicate with the passageway.
- a fluid may be supplied to the passageway from a proximal end of the shaft.
- the inflatable member has a spiral or helical form and is attached to the distal end portion of the shaft to communicate with the passageway through the side opening of the shaft.
- the inflatable member has an outer side surface, and an inner side surface entirely fixed to the side wall of the shaft not to be separated therefrom.
- the filter member has a distal end sealingly fixed to the distal end portion of the shaft and an open end at a side opposite to the distal end.
- the filter member extends along the flexible shaft to cover the distal end portion thereof and is fixed onto the outer side surface of the inflatable member along an entire length thereof.
- the inflatable member is made in a fully deflated condition.
- the distal end portion of the shaft is inserted into a blood vessel from a portion used in a regular PTCA procedure, and the shaft is advanced to a desired location in the blood vessel passing through a portion to be treated later.
- a liquid is supplied to the inflatable member through the passageway to thereby inflate the inflatable member.
- the proximal end of the filter member is opened and is held between an inner wall of the blood vessel and the inflatable member. Blood in the blood vessel flows along the inflatable member and passes through the filter member to remove a foreign substance, such as debris and blood clots.
- the inflatable member is deflated by forcibly removing the liquid in the inflatable member. Then, the filter member with the debris blood clots is removed from the blood vessel together with the shaft.
- the inflatable member is attached to both shaft and filter member along the entire inner and outer portions, when the inflatable member is inflated, the filter member can surely abuts against the inner wall of the blood vessel.
- the filter member is disposed close to the outer surface of the shaft with the debris or blood clots therein.
- the shaft with the inflatable member and the filter member can be easily removed from the blood vessel. The debris or blood clots is removed smoothly together with the filter member.
- the shaft of the filtering device is used as a guide shaft for allowing a vascular treatment device to be transferred in a blood vessel, resulting in that the guide shaft has the filtering member for capturing a foreign substance formed in the vascular treatment procedure.
- the filtering device may be transferred in the blood vessel through a guide wire.
- the shaft includes a partition wall in the passageway, and a port in the side wall near the partition wall.
- the partition wall divides the passageway into a first passageway extending from the proximal end portion of the shaft to the opening to communicate with the inflatable member, and a second passageway extending from the port to the distal end of the shaft to allow the guide wire to pass therethrough.
- the filtering device can be transferred to a desired location easily and rapidly through the guide wire already disposed in the blood vessel, as in the balloon catheter system.
- FIG. 1 is an explanatory view showing a first embodiment of a vascular filtering device of the invention placed in a blood vessel;
- FIG. 2 is an explanatory view showing a second embodiment of a vascular filtering device of the invention placed in a blood vessel.
- a first embodiment of the vascular filtering device 1 is formed of a flexible shaft 2 having a passageway 3 therein, a tube-like balloon or inflatable member 4 helically wound around a distal end portion of the shaft 2 , and a filter 5 in a substantially conical shape having a distal end 7 attached to the distal end of the shaft 2 .
- the shaft 2 may be made of metal or plastics, and has an elongated shape with flexibility to be inserted into a blood vessel, as in a regular PTCA device.
- the shaft 2 is used as a guide wire for a PTCA procedure.
- the passageway 3 of the shaft 2 has an open end (not shown) at a proximal end of the shaft 2 , and is closed at a distal end 6 .
- the shaft 2 has an opening 8 on the side wall at the distal end portion of the shaft to communicate with an interior of the balloon 4 for inflating and deflating the balloon 4 .
- the balloon 4 is hollow and is spirally or helically wound around the shaft 2 from a front end 9 at the distal end 6 of the shaft 2 to a rear end 10 thereof.
- the diameter of the balloon 4 is gradually enlarged from the front end 9 to the rear end 10 .
- the balloon 4 is entirely fixed to the outer surface of the shaft 2 at the inner side thereof along the entire length of the balloon 4 . There is no space between the balloon 4 and the shaft 2 . Therefore, the distance from the outer side of the balloon to the outer surface of the shaft 2 gradually increases from the front end 9 to the rear end 10 .
- the rear end 10 of the balloon 4 is sealingly connected to the opening 8 of the shaft 2 , so that the passageway 3 communicates with the interior of the balloon 4 .
- the front end 9 may also be communicated with the passageway 3 .
- the vascular filtering device 1 shown in FIG. 1 is in a condition that the balloon 4 is inflated in the blood vessel.
- the filter 5 shown in section in FIG. 1 surrounds the helically wound balloon 4 , and is fixed to the entire outside surface of the balloon 4 . Therefore, when the balloon 4 is inflated, the filter 5 mounted on the balloon 4 is expanded to form the conical shape as shown in FIG. 1. Also, when the balloon 4 is deflated, the filter 5 attached to the balloon 4 is disposed close to the outer surface of the shaft 2 .
- a bottom or enlarged portion of the conical shape filter 5 is opened to have an opening 11 shown in the figure, and a periphery of the opening 8 is partly attached to the balloon 4 .
- the filter 5 has a thickness of about 0.254 mm (0.001 inch) to 0.508 mm (0.002 inch), and includes numerous pores for allowing liquid, such as blood, to pass therethrough.
- the diameter of each pore is approximately 6 ⁇ m such that certain undesired substances, such as debris or blood clots, can not pass through the pores of the filter 5 while red and white blood corpuscles and so on can pass therethrough.
- the vascular filtering device 1 structured as described above is prepared such that the balloon 4 and the filter 5 are collapsed.
- the filtering device 1 is entered into a blood vessel, e.g. vein of a foot, similar to installing a guide wire into the blood vessel.
- the shaft is advanced, and the balloon 4 at the distal end portion of the shaft 2 passes through a treatment portion, e.g. stenosis, by a PTCA procedure later operated.
- a liquid is supplied to the balloon 4 through the passageway 3 to inflate the balloon 4 to set the shaft.
- the filter 5 is opened and is held between an inner wall of a blood vessel 12 and the balloon 4 .
- the filter 5 is set at a downstream of the blood vessel 12 relative to the treatment portion. In this condition, since the blood flows along the path around the balloon 4 and passes through the filter 5 , this condition is kept until the required operation, e.g. PTCA procedure for opening stenosis and installing a stent, is completed.
- the required operation e.g. PTCA procedure for opening stenosis and installing a stent
- the balloon 4 is deflated to collapse the filter 5 containing the debris or blood clots 13 therein by forcibly removing the liquid inside the balloon 4 . Since the filter 5 is fixed to the outer surface of the balloon 4 , when the balloon 4 is deflated, the filter 5 is also collapsed and disposed close to the shaft 2 while the debris or blood clots 13 are held between the filter and the shaft 2 . Then, the vascular filtering device 1 is removed from the blood vessel 12 by pulling the vascular filtering device 1 in a direction opposite to the direction of the blood flow. Accordingly, the debris or blood clots 13 formed at the PTCA procedure can be removed from the blood vessel 12 .
- the filter 5 when the balloon 4 is deflated, the filter 5 is collapsed to be located close to the outer surface of the shaft 2 . Therefore, although the debris or blood clots 13 is caught by the filter 5 , the size of the filter 5 is made small. Thus, the filtering device 1 of the invention can be removed from the blood vessel 12 smoothly.
- FIG. 2 shows a second embodiment of the vascular filtering device 1 ′ of the invention.
- the vascular filtering device 1 ′ is designed to be delivered to the proper position in the blood vessel through a guide wire 14 already placed in the blood vessel, and has a rapid exchange system.
- a shaft 2 ′ has a partition wall 15 therein to divide a passageway into an inflation passageway 3 ′ for inflating a balloon 4 ′ and a guidewire passageway 16 .
- a guidewire port 17 is provided near the partition wall 15 of the shaft, and the shaft 2 ′ has an opening 6 ′ at a distal end thereof.
- the guide wire 14 can pass through the guidewire port 17 , the passageway 15 and the opening 6 ′.
- the balloon 4 ′ has an elongated spiral shape slightly shorter than that of the balloon 4 , and is communicated with the passageway 3 ′ at one portion.
- the vascular filtering device 1 ′ is pushed into the blood vessel 12 along the guide wire 14 .
- the balloon 4 ′ is inflated to open and set the filter 5 .
- the required operation is carried out, and if debris or blood clots 13 is formed, it is captured by the filter 5 .
- the vascular filtering device 1 ′ can be removed from the blood vessel 12 over the guide wire 14 while the guide wire 14 is left in the blood vessel 12 . Thereafter, another vascular filtering device 1 ′ can be introduced in the blood vessel 12 over the guide wire 14 .
- the vascular filtering device having a filter at a distal end portion thereof can be placed in the downstream of the blood vessel while a PTCA procedure is operated in an upstream of the blood vessel, even if blood containing blood clots or debris due to PTCA procedure flows to the downstream of the blood vessel, the blood clots or debris can be captured and removed by the vascular filtering device without blocking the blood flow.
- the debris or blood clots can be prevented from migrating to the critical area, such as brain and pulmonary arteries, during and after the PTCA procedure.
- the filter can be surely located in the blood vessel in use, and also, the filter with the debris or blood clots can be made compact on the shaft to be easily removed from the blood vessel.
Abstract
A vascular filtering device is formed of a flexible shaft having a passageway extending inside the shaft, an inflatable member communicating with the passageway and having a spiral form, and a filter member fixed to the distal end portion of the shaft. The inflatable member is attached at an inner side thereof to a distal end portion of the shaft. The filter member is attached to the shaft and fixed onto the outer side surface of the inflatable member along the entire length thereof. When the inflatable member is inflated, the filter member is enlarged to allow a blood containing debris or blood clots to flow through the filter member. Thus, the debris or blood clots are captured by the filter member. When the inflatable member is deflated, the filter member is disposed close to the side surface of the shaft. Thus, the filter member with the debris or clots can be easily removed from the blood vessel.
Description
- This is a continuation in part application of Ser. No. 09/425,218 filed on Oct. 22, 1999.
- The present invention relates to a device for capturing a debris or blood clots in a blood vessel, and more particularly, it relates to a vascular filtering device for capturing and removing the debris or blood clots used in, e.g. percutaneous transluminal coronary angioplasty (PTCA) procedure.
- In recent years, an inter-vascular treatment, such as PTCA, has been widely practiced for a treatment of stenosis in the artery. In the PTCA procedure, a catheter which is provided with a balloon at a distal end thereof is inserted into a blood vessel which has a stenosis, and the balloon is inflated to enlarge the stenosis. Also, after enlarging the stenosis, a stent may be provided for preventing re-stenosis.
- In performing the PTCA procedure, however, it may cause other problems. Namely, debris or blood clots formed at the stenosis may be separated from the portion at the stenosis and migrate to other critical area, such as brain and pulmonary arteries, while the PTCA procedure is being performed.
- In order to remove the debris or blood clots while the PTCA procedure is being performed, a device having a mesh or net may be disposed in the blood vessel, as proposed in U.S. Pat. No. 6,001,118. The net is inflated by various inflating means to catch emboli, but the net with the emboli may not be smoothly removed from the blood vessel after use.
- The present invention has been made in view of the above problem, and an object of the invention is to provide a vascular filtering device for removing debris or blood clots in the blood vessel of a patient during an operation, such as balloon dilation procedure.
- Another object of the invention is to provide a vascular filtering device as stated above, which can be easily delivered to a desired location in the blood vessel and removed therefrom after capturing the debris or blood clots.
- A further object of the invention is to provide a vascular filtering device as stated above, which is formed easily and is used as a guide wire or tube for other procedure.
- Further objects and advantages of the invention will be apparent from the following description of the invention.
- A vascular filtering device of the invention is basically formed of a flexible shaft, an inflatable member attached to the shaft, and a filter member attached to the inflatable member and the shaft.
- The flexible shaft has a side surface, a passageway extending inside the flexible shaft, and a side opening formed in the side wall at a distal end portion of the shaft to communicate with the passageway. A fluid may be supplied to the passageway from a proximal end of the shaft.
- The inflatable member has a spiral or helical form and is attached to the distal end portion of the shaft to communicate with the passageway through the side opening of the shaft. The inflatable member has an outer side surface, and an inner side surface entirely fixed to the side wall of the shaft not to be separated therefrom.
- The filter member has a distal end sealingly fixed to the distal end portion of the shaft and an open end at a side opposite to the distal end. The filter member extends along the flexible shaft to cover the distal end portion thereof and is fixed onto the outer side surface of the inflatable member along an entire length thereof. Thus, when the inflatable member is inflated by providing the liquid to the inflatable member through the passageway, the filter member is enlarged to allow a foreign substance, such as blood clots and debris, to enter into the filter member through the open end to capture the same. When the inflatable member is deflated by forcibly removing the liquid from the inflatable member, the filter member with the blood clots and debris is closed or disposed close to the side surface of the shaft. Thus, the filtering device can be easily removed from the blood vessel.
- When the filtering device of the invention is used, the inflatable member is made in a fully deflated condition. The distal end portion of the shaft is inserted into a blood vessel from a portion used in a regular PTCA procedure, and the shaft is advanced to a desired location in the blood vessel passing through a portion to be treated later. Then, a liquid is supplied to the inflatable member through the passageway to thereby inflate the inflatable member. Accordingly, the proximal end of the filter member is opened and is held between an inner wall of the blood vessel and the inflatable member. Blood in the blood vessel flows along the inflatable member and passes through the filter member to remove a foreign substance, such as debris and blood clots.
- In this condition, since the filter and the inflatable member do not block the blood flow in the blood vessel, a required PTCA procedure can be made smoothly. If debris or blood clots is formed by the PTCA procedure and flows in the blood vessel, the debris or blood clots can be captures by the filter member.
- After the PTCA procedure is finished, the inflatable member is deflated by forcibly removing the liquid in the inflatable member. Then, the filter member with the debris blood clots is removed from the blood vessel together with the shaft.
- In the invention, since the inflatable member is attached to both shaft and filter member along the entire inner and outer portions, when the inflatable member is inflated, the filter member can surely abuts against the inner wall of the blood vessel. When the inflatable member is forcibly deflated, the filter member is disposed close to the outer surface of the shaft with the debris or blood clots therein. Thus, the shaft with the inflatable member and the filter member can be easily removed from the blood vessel. The debris or blood clots is removed smoothly together with the filter member.
- Preferably, the shaft of the filtering device is used as a guide shaft for allowing a vascular treatment device to be transferred in a blood vessel, resulting in that the guide shaft has the filtering member for capturing a foreign substance formed in the vascular treatment procedure.
- In the invention, the filtering device may be transferred in the blood vessel through a guide wire. In this case, the shaft includes a partition wall in the passageway, and a port in the side wall near the partition wall. The partition wall divides the passageway into a first passageway extending from the proximal end portion of the shaft to the opening to communicate with the inflatable member, and a second passageway extending from the port to the distal end of the shaft to allow the guide wire to pass therethrough. The filtering device can be transferred to a desired location easily and rapidly through the guide wire already disposed in the blood vessel, as in the balloon catheter system.
- FIG. 1 is an explanatory view showing a first embodiment of a vascular filtering device of the invention placed in a blood vessel; and
- FIG. 2 is an explanatory view showing a second embodiment of a vascular filtering device of the invention placed in a blood vessel.
- Hereinafter, embodiments of a vascular filtering device of the present invention will be explained with reference to the attached drawings.
- As shown in FIG. 1, a first embodiment of the
vascular filtering device 1 is formed of aflexible shaft 2 having apassageway 3 therein, a tube-like balloon orinflatable member 4 helically wound around a distal end portion of theshaft 2, and afilter 5 in a substantially conical shape having adistal end 7 attached to the distal end of theshaft 2. - The
shaft 2 may be made of metal or plastics, and has an elongated shape with flexibility to be inserted into a blood vessel, as in a regular PTCA device. In the first embodiment, theshaft 2 is used as a guide wire for a PTCA procedure. - The
passageway 3 of theshaft 2 has an open end (not shown) at a proximal end of theshaft 2, and is closed at a distal end 6. Theshaft 2 has anopening 8 on the side wall at the distal end portion of the shaft to communicate with an interior of theballoon 4 for inflating and deflating theballoon 4. - The
balloon 4 is hollow and is spirally or helically wound around theshaft 2 from afront end 9 at the distal end 6 of theshaft 2 to arear end 10 thereof. The diameter of theballoon 4 is gradually enlarged from thefront end 9 to therear end 10. Also, theballoon 4 is entirely fixed to the outer surface of theshaft 2 at the inner side thereof along the entire length of theballoon 4. There is no space between theballoon 4 and theshaft 2. Therefore, the distance from the outer side of the balloon to the outer surface of theshaft 2 gradually increases from thefront end 9 to therear end 10. - The
rear end 10 of theballoon 4 is sealingly connected to theopening 8 of theshaft 2, so that thepassageway 3 communicates with the interior of theballoon 4. Thefront end 9 may also be communicated with thepassageway 3. - Incidentally, the
vascular filtering device 1 shown in FIG. 1 is in a condition that theballoon 4 is inflated in the blood vessel. - The
filter 5 shown in section in FIG. 1 surrounds the helically woundballoon 4, and is fixed to the entire outside surface of theballoon 4. Therefore, when theballoon 4 is inflated, thefilter 5 mounted on theballoon 4 is expanded to form the conical shape as shown in FIG. 1. Also, when theballoon 4 is deflated, thefilter 5 attached to theballoon 4 is disposed close to the outer surface of theshaft 2. - A bottom or enlarged portion of the
conical shape filter 5 is opened to have anopening 11 shown in the figure, and a periphery of theopening 8 is partly attached to theballoon 4. Thefilter 5 has a thickness of about 0.254 mm (0.001 inch) to 0.508 mm (0.002 inch), and includes numerous pores for allowing liquid, such as blood, to pass therethrough. The diameter of each pore is approximately 6 μm such that certain undesired substances, such as debris or blood clots, can not pass through the pores of thefilter 5 while red and white blood corpuscles and so on can pass therethrough. - In use, the
vascular filtering device 1 structured as described above is prepared such that theballoon 4 and thefilter 5 are collapsed. In this condition, thefiltering device 1 is entered into a blood vessel, e.g. vein of a foot, similar to installing a guide wire into the blood vessel. The shaft is advanced, and theballoon 4 at the distal end portion of theshaft 2 passes through a treatment portion, e.g. stenosis, by a PTCA procedure later operated. Then, a liquid is supplied to theballoon 4 through thepassageway 3 to inflate theballoon 4 to set the shaft. As a result, thefilter 5 is opened and is held between an inner wall of ablood vessel 12 and theballoon 4. Thus, thefilter 5 is set at a downstream of theblood vessel 12 relative to the treatment portion. In this condition, since the blood flows along the path around theballoon 4 and passes through thefilter 5, this condition is kept until the required operation, e.g. PTCA procedure for opening stenosis and installing a stent, is completed. - In case debris or
blood clots 13 occurs at the upstream side of theblood vessel 12 during the PTCA procedure, blood containing the debris orblood clots 13 flows to the downstream of theblood vessel 12 in a direction shown by arrows in FIG. 1. Blood containing debris orblood clots 13 flows into theopening 11 of thefilter 5, and flows along the helical path of theballoon 4. Blood passes through the pores of thefilter 5, while the debris orblood clots 13 is caught inside the conical shapedfilter 5 since they can not pass through the pores of thefilter 5. - After the PTCA procedure is completed, the
balloon 4 is deflated to collapse thefilter 5 containing the debris orblood clots 13 therein by forcibly removing the liquid inside theballoon 4. Since thefilter 5 is fixed to the outer surface of theballoon 4, when theballoon 4 is deflated, thefilter 5 is also collapsed and disposed close to theshaft 2 while the debris orblood clots 13 are held between the filter and theshaft 2. Then, thevascular filtering device 1 is removed from theblood vessel 12 by pulling thevascular filtering device 1 in a direction opposite to the direction of the blood flow. Accordingly, the debris orblood clots 13 formed at the PTCA procedure can be removed from theblood vessel 12. - In the invention, when the
balloon 4 is deflated, thefilter 5 is collapsed to be located close to the outer surface of theshaft 2. Therefore, although the debris orblood clots 13 is caught by thefilter 5, the size of thefilter 5 is made small. Thus, thefiltering device 1 of the invention can be removed from theblood vessel 12 smoothly. - FIG. 2 shows a second embodiment of the
vascular filtering device 1′ of the invention. Thevascular filtering device 1′ is designed to be delivered to the proper position in the blood vessel through aguide wire 14 already placed in the blood vessel, and has a rapid exchange system. - Namely, in the
filtering device 1′, ashaft 2′ has apartition wall 15 therein to divide a passageway into aninflation passageway 3′ for inflating aballoon 4′ and aguidewire passageway 16. Also, aguidewire port 17 is provided near thepartition wall 15 of the shaft, and theshaft 2′ has an opening 6′ at a distal end thereof. Theguide wire 14 can pass through theguidewire port 17, thepassageway 15 and the opening 6′. In thevascular filtering device 1′, theballoon 4′ has an elongated spiral shape slightly shorter than that of theballoon 4, and is communicated with thepassageway 3′ at one portion. - In use, an end of the
guide wire 14 is inserted into thepassageway 15, and thevascular filtering device 1′ is pushed into theblood vessel 12 along theguide wire 14. After thefiltering device 1′ is disposed in the proper position, theballoon 4′ is inflated to open and set thefilter 5. Then, the required operation is carried out, and if debris orblood clots 13 is formed, it is captured by thefilter 5. In this embodiment, in case thevascular filtering device 1′ is to be exchanged, thevascular filtering device 1′ can be removed from theblood vessel 12 over theguide wire 14 while theguide wire 14 is left in theblood vessel 12. Thereafter, anothervascular filtering device 1′ can be introduced in theblood vessel 12 over theguide wire 14. - According to the present invention, since the vascular filtering device having a filter at a distal end portion thereof can be placed in the downstream of the blood vessel while a PTCA procedure is operated in an upstream of the blood vessel, even if blood containing blood clots or debris due to PTCA procedure flows to the downstream of the blood vessel, the blood clots or debris can be captured and removed by the vascular filtering device without blocking the blood flow. Thus, the debris or blood clots can be prevented from migrating to the critical area, such as brain and pulmonary arteries, during and after the PTCA procedure.
- In the invention, since the balloon is firmly fixed to the shaft and the filter at the inner and outer portions thereof, the filter can be surely located in the blood vessel in use, and also, the filter with the debris or blood clots can be made compact on the shaft to be easily removed from the blood vessel.
- While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.
Claims (5)
1. A vascular filtering device, comprising:
a flexible shaft having a side surface, a passageway extending inside the flexible shaft, and a side opening formed in the side surface at a distal end portion of the shaft and communicating with the passageway,
an inflatable member having a spiral form and attached to the distal end portion of the shaft to communicate with the passageway through the side opening of the shaft, said inflatable member having an outer side surface, and an inner side surface entirely fixed to the side wall of the shaft, and
a filter member having a distal end sealingly fixed to the distal end portion of the shaft and an open end at a side opposite to the distal end thereof, said filter member extending along the flexible shaft and fixed onto the outer side surface of the inflatable member along an entire length thereof so that when the inflatable member is inflated, the filter member is enlarged to allow a foreign substance to enter into the filter member through the open end, and when the inflatable member is deflated, the filter member is disposed close to the side surface of the shaft.
2. A vascular filtering device according to , wherein said shaft is a guide shaft for allowing a vascular treatment device to be transferred in a blood vessel.
claim 1
3. A vascular filtering device according to , wherein said filter member has a bag shape opening toward a proximal end portion of the shaft.
claim 1
4. A vascular filtering device according to , wherein said inflatable member has a tubular shape with a hollow portion therein extending substantially throughout an entire length thereof, said hollow portion having a diameter gradually enlarging from the distal end of the shaft.
claim 1
5. A vascular filtering device according to , wherein said shaft includes a partition wall therein, and a port in the side wall near the partition wall, said partition wall dividing the passageway into a first passageway extending from a proximal end portion of the shaft to the opening to communicate with the inflatable member, and a second passageway extending from the port to a distal end of the shaft to allow a guide wire to pass therethrough.
claim 1
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/769,312 US6340364B2 (en) | 1999-10-22 | 2001-01-26 | Vascular filtering device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US42521899A | 1999-10-22 | 1999-10-22 | |
US09/769,312 US6340364B2 (en) | 1999-10-22 | 2001-01-26 | Vascular filtering device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US42521899A Continuation-In-Part | 1999-10-22 | 1999-10-22 |
Publications (2)
Publication Number | Publication Date |
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US20010007947A1 true US20010007947A1 (en) | 2001-07-12 |
US6340364B2 US6340364B2 (en) | 2002-01-22 |
Family
ID=23685660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/769,312 Expired - Fee Related US6340364B2 (en) | 1999-10-22 | 2001-01-26 | Vascular filtering device |
Country Status (1)
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US (1) | US6340364B2 (en) |
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JP2017517368A (en) * | 2014-07-15 | 2017-06-29 | 中国人民解放軍第二軍医大学 | Membrane ureteral stone barrier extractor |
US20210030524A1 (en) * | 2017-06-23 | 2021-02-04 | Jihad A. Mustapha | Peripheral vascular filtration systems and methods |
US11779451B2 (en) * | 2017-06-23 | 2023-10-10 | Jihad A. Mustapha | Peripheral vascular filtration systems and methods |
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