WO2002089705A1 - Matched balloon to stent shortening - Google Patents
Matched balloon to stent shortening Download PDFInfo
- Publication number
- WO2002089705A1 WO2002089705A1 PCT/US2002/004363 US0204363W WO02089705A1 WO 2002089705 A1 WO2002089705 A1 WO 2002089705A1 US 0204363 W US0204363 W US 0204363W WO 02089705 A1 WO02089705 A1 WO 02089705A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- balloon
- stent
- catheter
- expandable member
- belt
- Prior art date
Links
Classifications
-
- 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
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/958—Inflatable balloons for placing stents or stent-grafts
Definitions
- Balloons and stents for delivery in a bodily vessel are typically matched in length when the balloon is in the uninflated state and the stent is unexpanded. During deployment of the stent, the stent typically shortens and the balloon grows in length. This can result in unnecessary trauma to healthy portions of a bodily vessel as the balloon applies a force to portions of the vessel which do not require stenting. It would be desirable to provide a balloon and stent which are substantially the same length in the unexpanded state and which, to the extent they foreshorten, are characterized by similar foreshortening rates.
- the invention is directed to a catheter comprising an expandable member including a portion which foreshortens longitudinally upon radial expansion.
- the expandable member may comprise a foreshortening balloon and/or a foreshortening belt.
- a prosthetic device for example a stent, may optionally be disposed about the balloon.
- the balloon is characterized by a foreshortening rate R f
- the prosthetic device is characterized by a foreshortening rate R p substantially equal to R,
- the balloon includes a body portion which is substantially the same length as the optional prosthetic device.
- the expandable member comprises at least one belt which foreshortens
- a prosthetic device such as a stent is disposed about the belt.
- the belt is characterized by a foreshortening rate R
- the prosthetic device is characterized by a foreshortening rate R p R p is substantially equal to R b .
- the belt may be disposed about the circumference of a balloon.
- a single belt may be provided or a plurality of belts may be provided. Where a single belt is provided, desirably, the belt and the prosthetic device are substantially the same length.
- the belts are characterized by a foreshortening rate R ⁇ and the prosthetic device is characterized by a foreshortening rate R p substantially equal to R,
- the belts do not extend beyond the prosthetic device.
- the belt may be in the form of a braid or a coil.
- the invention is directed to a catheter for delivering an implantable prosthetic device to a desired location in a bodily vessel comprising an expandable member and a prosthetic device disposed about the expandable member.
- the expandable member includes a portion which changes in length in tandem with the prosthetic device.
- the implantable prosthetic device is a stent and the expandable member comprises a balloon.
- the expandable member is capable of lengthening at a rate of R,
- the stent is capable of lengthening at a rate R s substantially equal to R b .
- the invention is directed to a method of preparing a prosthesis delivery catheter comprising the steps of selecting a prosthesis, the prosthesis characterized by a foreshortening rate R p , selecting a catheter comprising an expandable member including a portion which foreshortens longitudinally upon radial expansion and disposing the prosthesis about the expandable member.
- the prosthesis is a stent and the expandable member comprises a balloon which foreshortens at a rate R,, substantially equally to R p .
- the expandable member comprises a belt
- the prosthesis is disposed about the belt in the disposing step.
- the prosthesis and the belt are substantially the same length.
- belt foreshortens at a rate R ⁇ substantially equally to R p .
- the prosthesis is a stent and the method involves the step of selecting the catheter and the stent so that the foreshortening rate of the stent is equal to the foreshortening rate of the portion of expandable member which foreshortens on expansion.
- Fig. 1 is a side profile section showing an inventive balloon and stent.
- Fig. 2 is a side profile section, similar to Fig. 1, with the balloon and the stent fully inflated to deployment diameter.
- Fig. 3 is a side profile section, showing a balloon in combination with a belt and a stent, with the balloon partially inflated.
- Fig. 4 is a side profile section, showing a balloon in combination with a plurality of belts and a stent, with the balloon partially inflated.
- Fig. 5 is a side profile view of a braid.
- Fig. 6 is a schematic illustration of a balloon in combination with a belt in the form of a coil.
- Fig. 7 is a perspective view of an inventive balloon and catheter with parts cut away.
- Fig. 8 is a cross-sectional view of an inventive balloon and catheter similar to that shown in Fig. 7.
- Fig. 9 is a cross-sectional view of another inventive balloon and catheter.
- Fig. 10a is a cross-sectional view of another inventive balloon and catheter prior to inflation of the balloon.
- Fig. 10b is a cross-sectional view of another inventive balloon and catheter prior following inflation of the balloon.
- Fig. 11 is a cross-sectional view of an inventive toroidal balloon and catheter in an unexpanded configuration.
- Fig. 12 is a cross-sectional view of an inventive toroidal balloon and catheter in an expanded configuration.
- the stent foreshortening rate R is defined as the ratio of the change in length of the stent to the change in diameter of the stent.
- the prosthesis foreshortening rate R p is defined as the ratio of the change in length of the prosthesis to the change in diameter of the prosthesis.
- the foreshortening rate R, of the portion of the expandable member which foreshortens is defined as the ratio of the change in length of the portion of the expandable member to the change in diameter of the portion of the expandable.
- R b is the ratio of the change in balloon length to the change in balloon diameter on expansion of the balloon.
- the invention is directed in one embodiment to a catheter comprising an expandable member including a portion which foreshortens longitudinally upon radial expansion.
- distal end of catheter 100 includes an expandable member in the form of balloon 104.
- balloon 104 is shown in the uninflated state while in Fig. 2, balloon 104 is shown inflated.
- the proximal end of the catheter is not shown.
- Balloon 104 is supplied with an inflation fluid via inflation lumen 108.
- Balloon 104 is disposed about inner member tube 110.
- inner member 110 is in the form of a tube.
- An optional retractable outer tube 130 may also be provided.
- the invention also contemplates other types of expansion members. Examples of suitable catheters with an expansion member which may be modified for use in the present invention are described in US 5,772,669 and US 6,036,697.
- an optional prosthetic device is disposed about the balloon.
- the prosthetic device is stent 112.
- Stent 112 desirably is a balloon or otherwise mechanically expandable stent. Stent 112 may also be self- expanding, or a hybrid self-expanding in-part and mechanically expandable in part. Examples of self-expanding stents and balloon expandable stents are provided in WO 9626689 and in US 5,972,018.
- the term stent is also intended to include stent-grafts and other grafts. Other types of prosthetic devices which may be used include vena cava filters.
- a stent is used and the stent foreshortens on expansion at a rate of R j , and the balloon foreshortens at a rate R,
- the stent foreshortening rate R is substantially equal to R ⁇
- Desirably body portion 116 of balloon 104 is substantially the same length as stent 112.
- expandable member in the form of balloon 104 further comprises at least one belt 120 extending about the circumference of the balloon. Belt 120 foreshortens on radial expansion.
- a prosthesis desirably in the form of stent 112, is disposed about the belt.
- Belt 120 is characterized by a foreshortening rate R ⁇ and stent 112 is characterized by a foreshortening rate R,.. Desirably, R,. is substantially equal to R,,. As shown in Fig. 3, only one belt is disposed about the balloon and stent 112 and belt 120 are, desirably, substantially the same length. Balloon 104 may be as long as belt 120 or longer. Catheter 100 is further shown with optional retractable outer tube 130.
- the invention also contemplates embodiments in which a plurality of belts 120a-c are provided, as shown in Fig. 4. Desirably, the belts do not extend beyond the stent. At least some of belts 120a-c are characterized by a foreshortening rate R ⁇ and the stent is characterized by a foreshortening rate R j which, desirably, is substantially equal to R f ,. Desirably, at least the proximal most belt 120a and the distal most belt 120c foreshorten upon radial expansion. More desirably, all of the belts foreshorten upon radial expansion.
- Belt 120 is constructed and arranged to foreshorten on radial expansion.
- Belt 120 may be made of any suitable material.
- the belt is made of a polymeric material.
- An example of a suitable polymer for use in the belt is polyamide. Kevlar ® , a family of aromatic polyamide available from DuPont, may also be used.
- Other suitable polymers include liquid crystal polymers (LCP's).
- the belt is provided in the form of a braid, as shown at 120 in Fig. 5.
- the braid angle and the dimensions, including the width and diameter, of the individual members forming the braid may be varied so that the rate of foreshortening of the braid is equal to the foreshortening rate of the stent or other prosthesis.
- the pick rate of the braid may be chosen so that the rate of foreshortening of the braid is equal to the foreshortening rate of the stent or other prosthesis.
- the pick rate of the braid may equal the pick rate of the stent.
- a braid made of Kevlar ® or LCP fibers may be used in conjunction with a slotted tube or braided stent.
- the belt may also be provided in the form of a coil as shown at 120 in Fig. 6.
- the coil may be made of suitable materials whether polymeric or otherwise.
- the pitch of the coil and the materials may be selected to achieve the desired foreshortening rate.
- balloon 104 in another embodiment of the invention, as shown in Fig. 7, balloon 104 includes an inner layer of material 124, belt 120 disposed about inner layer 124 and an outer layer of material 122. A portion of outer layer 122 and belt 120 have.been cut away for illustrative purposes.
- Belt 120 as shown in Fig. 7, is in the form of a mesh. Belt 120 may optionally be in the form of a braid, a coil or any other suitable form which foreshortens upon inflation of the balloon.
- a cross-sectional view of a balloon catheter similar to that shown in Fig. 7, taken along line 8-8, is shown generally at 100 in Fig. 8.
- the balloon catheter shown in Fig. 8 further comprises an optional outer tube 130 disposed about inner member 110.
- Inner member 110 desirably is in the form of a tube. As shown in Fig. 8, the belt is limited to the body portion of the balloon. The invention also contemplates providing a belt which is coextensive with the inner and outer layers of the balloon extending the entire length of the balloon.
- the belt is also within the scope of the invention for the belt to be the same length as the length of the balloon.
- balloon 104 includes at least one and, desirably, a plurality of reinforcing members 120.
- Reinforcing members 120 may be in any suitable form including cords, fibers, filaments and braids.
- Balloon 104 is sealed to inner member 110 via sliding seal 117.
- Balloon 104 may be supplied with an inflation fluid via inflation lumen such as that shown at 108 by way of example.
- inflation lumen such as that shown at 108 by way of example.
- the balloon foreshortening rate R b is substantially equally to the foreshortening rate of a stent or other prosthesis (not shown) disposed thereabout.
- the reinforcing members may be provided in a variety of ways including as an integral part of the balloon material, as an additional interior or exterior layer of the balloon, or in-between layers of balloon material.
- the reinforcing members may be made of any suitable material including polyethyleneterephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT),NylonTM, engineering thermoplastic polyurethanes, fluoropolymers, polyester/polyether elastomers such as ArnitelTM available from DSM Engineering, polyurethane-polyether polymers, such as TecothaneTM 1055D or 1075D, TecoplastTM 470 both of which are available from Thermedics, Inc.; polyester-polyurethanes, such as EstaneTM 58170 sold by BF Goodrich; polyether block amides, such as PebaxTM 7233 or 6333 both of which are available from Elf Atochem.
- polystyrene polystyrene
- polyvinyl chloride acrylonitrile-butadiene-styrene polymers
- polyacrylomtrile poly aery late
- vinyl acetate polymer vinyl acetate polymer
- cellulose plastics polyurethanes
- polyethylene terephthalate polyacetal
- polyethers polycarbonates, polyamides, polyphenylene sulfide, polyarylethersulfones, polyaryletherketones, polytetrafluoroethylene, and any combinations thereof.
- Balloon 104 is disposed about inner member 110 and in fluid communication with inflation lumen 108. At least one and, desirably, as shown in Fig. 10a, both ends of balloon 104 include overhanging portions 105a and 105b. Overhanging portions 105a and 105b each form a double layer about the inner member. Proximal overhanging portion 105a extends in a proximal direction beyond the point or region of connection between the proximal end of the balloon and the inner member or any other catheter tube or member to which it may be joined.
- Distal overhanging portion 105b extends in a distal direction beyond the point or region of connection between the distal end of the balloon and the inner member any other catheter member to which it may be joined. Desirably, the length of the overhanging portions ranges from about 0.5 mm to about 2 mm.
- Prosthetic device 112 suitably a stent or any other prosthetic device disclosed herein, is optionally disposed about body portion 116 of balloon 104. Upon expansion of balloon 104, the one or more overhanging regions extend substantially radially outward and minimally overhang the inner member if at all. Desirably, the length of body portion 116 remains unchanged on expansion of the balloon or decreases in length by an amount corresponding to the decrease in length of the stent or other prosthesis during expansion.
- the invention is directed to a toroidal medical balloon which foreshorten on expansion.
- Balloon 104 shown in an uninflated configuration in Fig. 11, is disposed about inner member 110.
- Balloon 104 is supplied with an inflation fluid via inflation lumen 108.
- the invention also contemplates other arrangements of inflation lumens.
- the inflation lumen could be internal to the inner member or could form a part of the inner member.
- the balloon may be made of expanded PTFE, elastomeric materials including latex or silicone or any other suitable balloon materials as known in the art including compliant balloon materials and non-compliant balloon materials. Examples of balloon materials are disclosed in US 5,830,182 and US 5,500,181.
- an optional prosthetic device is disposed about the balloon.
- Suitable prosthetic devices include stents and any of the other prosthetic devices disclosed herein. More desirably, where the prosthetic device foreshortens upon expansion, the rate of foreshortening of the prosthetic device and the balloon is matched. As shown in Figs. 8 and 11, the foreshortening of stent 112 and balloon 104 is matched - stent 112 and balloon 104 foreshorten at an equal rate with both the balloon and the stent shrinking from a length L prior to expansion to a length L- ⁇ L following expansion.
- the arrangement of Figs. 8 and 12 may further comprise a retractable sheath (not shown) disposed about the balloon as disclosed in US 5,772,669 as well as other features of catheters as known in the art.
- the invention is directed to a catheter for delivering an implantable prosthetic device to a desired location in a bodily vessel comprising an expandable member and a prosthetic device disposed about the expandable member.
- the expandable member includes a portion which changes in length in tandem with the prosthetic device.
- the implantable prosthetic device is a stent and the expandable member comprises a balloon.
- the expandable member is capable of lengthening at a rate of R,
- the stent is capable of lengthening at a rate R,. substantially equal to R,,. Any of the inventive catheters disclosed herein may be provided in such an embodiment.
- the belt may be constructed and arranged to lengthen at a rate equal to the rate at which the accompanying stent lengthens.
- the construction of the braid, including the pick rate may be modified to match the stent and belt lengthening rates. Lengthening of the stent may occur as the stent is tracked through tortuous vessels during delivery of the stent to a desired bodily location.
- the invention is also directed to methods of producing the inventive medical balloons for catheters disclosed herein.
- a mandrel is provided and a first layer of balloon material deposited on the mandrel.
- Any suitable balloon material may be used including Pebax, Nylon, polyethylene terephthalate (PET) or polyethylene.
- a braid may then be disposed about the first layer.
- the braid may be the same length as the first balloon material or shorter. Desirably, the length of the braid will correspond to the length of the body portion of the balloon to be formed.
- the braid may be made of any of the materials disclosed above.
- a second layer of balloon material is then disposed about the braid and the first layer of material to complete the balloon preform. The mandrel is then removed and the balloon blown under standard balloon blowing conditions as known in the art to form the inventive balloon.
- a tube may be extruded and a braid disposed about the tube.
- a heat shrink wrap for example TeflonTM based, in conjunction with the application of heat, may be used to embed the braid in the tube.
- the tube may then be blown in accordance with techniques well known in the art.
- the invention is also directed to catheters having other types of expandable members for expanding prostheses including stents in conjunction with one or more foreshortening belts disposed about the expandable member.
- any of the inventive balloons disclosed herein may be provided with or without a prosthetic devce disposed thereabout.
- the inventive catheter may further comprise a sock at the proximal and/or distal end of the balloon or other expandable member to aid in retaining a stent or other prosthesis on the balloon or expandable member.
- the sock(s) may be made of any suitable material as known in the art. At least a portion of the sock may be radiopaque. More details concerning socks may be found in US Application 09/668496.
- the invention is directed, in another embodiment, to a method of preparing a prosthesis delivery catheter comprising the steps of selecting a prosthesis, the prosthesis characterized by a foreshortening rate R p , selecting a catheter comprising an expandable member including a portion which foreshortens longitudinally upon radial expansion and disposing the prosthesis about the expandable member.
- the expandable member may comprise a balloon and/or a belt.
- the prosthesis is a stent. Any of the other prostheses disclosed above may also be used.
- the expandable member comprises a balloon, desirably, the balloon foreshortens at a rate R,, substantially equally to R p .
- the prosthesis is disposed about the belt in the disposing step.
- the belt and the prosthesis are substantially the same length.
- the belt foreshortens at a rate R,, substantially equally to R p .
- the inventive methods may comprise the further step of selecting the prostheses and the catheter so that the foreshortening rate of the prostheses is equal to the foreshortening rate of the portion of expandable member which foreshortens on expansion.
- inventive catheters and methods may be used in delivering prostheses to any suitable bodily vessel including coronary, mesentery, peripheral, or cerebral vasculature, veins, the gastrointestinal tract, the biliary tract, the urethra, the trachea, hepatic shunts and fallopian tubes.
- any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims).
- the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below (e.g. claim 3 may be taken as alternatively dependent from claim 1 ; claim 6 may be taken as alternatively dependent on claim 3, or on claim 4; etc.).
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02706270A EP1399093B1 (en) | 2001-05-08 | 2002-02-13 | Matched balloon to stent shortening |
DE60236727T DE60236727D1 (en) | 2001-05-08 | 2002-02-13 | Adapted balloon for stent shortening |
CA002445062A CA2445062C (en) | 2001-05-08 | 2002-02-13 | Matched balloon to stent shortening |
JP2002586846A JP4369130B2 (en) | 2001-05-08 | 2002-02-13 | Balloon compatible with stent contraction |
AT02706270T ATE471129T1 (en) | 2001-05-08 | 2002-02-13 | ADAPTED BALLOON FOR STENT SHORTENING |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/850,815 US6911038B2 (en) | 2001-05-08 | 2001-05-08 | Matched balloon to stent shortening |
US09/850,815 | 2001-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002089705A1 true WO2002089705A1 (en) | 2002-11-14 |
Family
ID=25309185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/004363 WO2002089705A1 (en) | 2001-05-08 | 2002-02-13 | Matched balloon to stent shortening |
Country Status (7)
Country | Link |
---|---|
US (1) | US6911038B2 (en) |
EP (1) | EP1399093B1 (en) |
JP (1) | JP4369130B2 (en) |
AT (1) | ATE471129T1 (en) |
CA (1) | CA2445062C (en) |
DE (1) | DE60236727D1 (en) |
WO (1) | WO2002089705A1 (en) |
Cited By (1)
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WO2006019677A1 (en) | 2004-08-05 | 2006-02-23 | Medtronic Vascular, Inc. | Intraluminal stent assembly and method of deploying the same |
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Also Published As
Publication number | Publication date |
---|---|
JP4369130B2 (en) | 2009-11-18 |
EP1399093B1 (en) | 2010-06-16 |
DE60236727D1 (en) | 2010-07-29 |
JP2004528114A (en) | 2004-09-16 |
US20020169494A1 (en) | 2002-11-14 |
CA2445062A1 (en) | 2002-11-14 |
US6911038B2 (en) | 2005-06-28 |
ATE471129T1 (en) | 2010-07-15 |
EP1399093A1 (en) | 2004-03-24 |
CA2445062C (en) | 2009-04-14 |
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