CA2050278A1 - Dilatation catheter - Google Patents

Dilatation catheter

Info

Publication number
CA2050278A1
CA2050278A1 CA 2050278 CA2050278A CA2050278A1 CA 2050278 A1 CA2050278 A1 CA 2050278A1 CA 2050278 CA2050278 CA 2050278 CA 2050278 A CA2050278 A CA 2050278A CA 2050278 A1 CA2050278 A1 CA 2050278A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
balloon
shaft
catheter
spring
tip
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.)
Abandoned
Application number
CA 2050278
Other languages
French (fr)
Inventor
Leo Roucher
Erich Wolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medtronic Inc
Original Assignee
Leo Roucher
Erich Wolf
Medtronic, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Abstract

2050278 9113649 PCTABS00007 A catheter (10) having a torque transmitting shaft (14), a flexible catheter body (12) with a lumen (42) for passage of the shaft (14), and a balloon (16) mounted on the distal end of the catheter body (12) is disclosed. Flexible tubing (48) extends from within the balloon (16) to the distal tip of the catheter (10) and is bonded to the distal end of the balloon (16) so that the shaft (14) is free to move relative to the distal end of the balloon (16). The flexible tubing (48) may include a spring (72) covered by a tip tube (82), which is attached at its proximal and distal ends to the shaft (14).

Description

2a~278 WO9l/13~9 PCT/US91/01571 DILATATION CAT~ETER

BACKGROUND OF THE INVENTION
Field of the Invention - This invention relates to medical catheters, particularly those for opening lesions 5 in arteries.
Catheters designed for steering through a tortuous path of small arteries, such as the coronary arterles, have been of two general types. One type slides over a separate guidewire. The second type involves a guidewire 10 built into the catheter. The guidewire and catheter are inserted in the artery as a unit.
Such catheters built on a wire are steered through the arteries by directing a bent tip in the proper direction to enter a branch. The guidewire is rotated to 15 turn the bent tip in the proper direction. A known problem in the prior art on-the-wire catheters is that rotation of the guidewire may cause the balloon in the catheter to twist and wrap up around the guidewire. This will cause later problems in inflation and deflation of

2~ the balloon.
This problem is taught in United States Patent No.
4,664,113 which explai-ns the problems with balloon wrap.
That patent discloses a typical prior art device where the distal end of the balloon is fixed directly to the 25 guidewire. When the guidewire rotates, the balloon twists. In an attempt to mitigate this problem, that patent limited rotation of the wire. Such li- 'ations on rotation are well known in other cathet~r arts, but is found to be necessary for a particular functional purpose 30 in wires of the type disclosed with a balloon honded directly to a guidewire. What is needed in the art is a balloon structure which performs the functions of traditional on-the-wire catheters, but is not subject to the balloon wrap problem of the style in United States 35 Patent No. 4,664,113.
One other attempt to solve this problem is a design such as the P~OBE catheter from USCI. This has a

3~9 '~ PCT/US91/01571 guidewire independent of the end of the balloon.
However, the device does not have sufficient structural integrity for retaining the guidewire relative to the catheter structure. A structure is needed which prevents 5 wrap but which is structurally sound and preserves the integrity of the tip area.

SUMMARY OF THE INVENTION
A catheter constructed according to the present invention involves a torque transmitting shaft, a l0 flexible catheter body having a lumen for passage of the shaft, a balloon mounted on the distal end of the catheter body; a flexible tubing extending from within the balloon out to a distal tip of the catheter; the flexible tubing being bonded to the distal end of the 15 balloon so that the shaft is free to move relative to the distal end of the balloon.
In the preferred embodiment the flexible tubing includes a spring covered by a tip tube. The spring attached at its proximal end and distal ends to the 20 shaft.

BRIEF DESCRIPTION OF THE DRAWINGS
Fig. l is a side plan view of a catheter constructed according to the present invention partially broken way.
Fig. 2 is a cross sectional view of a distal portion 25 of the catheter of Fig. l.
Fig. 3 is a cut-away, partially cross sectional, view of a proximal section of the catheter of Fig. l, including the manifold.

DETAILED DESCRIPTION OF THE DRAWINGS
The catheter l0 constructed according to the present invention includes a flexible catheter body 12, a torque transmitting shaft 14, a balloon 16, a flexible tip 18 and a manifold or handle 20. Handle 20 includes an arm WO91/13649 29~a278 PCT/US91/01571 24 for mounting balloon inflation equipment and a second arm 26 for guidewire mounting. A rotatable handle 28 is mounted for rotation within arm 26.
As shown in Fig~ 2, catheter body 12 includes a body 5 spring 40 which is a spring wound of metal of a rectangular cross section. Body springs of prior art devices such as the Versaflex Omniflex catheter are suitable. ~ody spring 40 forms a lumen 42 through which passes shaft 14. Mounted within lumen 42 is a smaller 10 diameter stainless steel spring 44 which is brazed to body spring 40 at braze 46.
In the illustrated embodiment, body spring 40 has an outside diameter of .30 inches. Spring 44 has an outside diameter of .026 inches.
Flexible plastic tubing 48 is mounted over body spring 40, as in the prior art Omniflex device. In the preferred embodiment, tube 48 is made of polyethylene shaft stock.
Tubing 48 is tapered at its distal section 50 where 20 it narrows to fit over spring 44. Balloon 16 has a proximal section 52 mounted over the tapered section 50 of tube 48O Spring 48 is attached to tube 48 by adhesive. In the preferred embodiment, section 52 o~
balloon 16 is cut off with a square non-tapered end. The 25 section 50 of tube 48 which is not covered by balloon portion 52 is filled in with adhesive 54 to make a smooth external surface of the outside diameter of tube 48.
Balloon proximal portion 52 and adhesive 5 are generally equal in diameter. In the preferred embodiment, adhesive 30 54 is in ultraviolet cured adhesive.
A radiopague marker band 60 is mounted within balloon 16 on shaft 14, preferably by brazing. Marker 60 is made and attached using common prior art techniques.
MarXer 60 is preferably a platinum cylinder, but may be 35 platinum wire wound around shaft 12. In order to have a smooth transition from shaft 14 to marker 60, a ramp of WO91/13~9 PCT/US91/01571 ~i327~

adhesive 62 formed at either end of the marker 60. In the preferred embodiment, adhesive 62 is cyanoacrylate.
Shaft 14 has a tapered section 64 and a flattened tip 66. Mounted on flattened tip 66 by brazing is a flat 5 ribbon wire 68. A metallic tip 70 is brazed to the tip of flat wire 68.
A tip spring 72 is mounted over shaft 14. Tip spring 72 has a tightly coiled medial section 74, a spread flexible proximal section 76 and a spread flexible 10 distal section 78. The proximal end of section 76 is brazed to shaft 14 at 80. Distal section 78 is brazed to tip 70. Therefore, spring 72 is fixed at either end but flexes throughout the rest of its structure. A tip tube 82 is mounted over spring 72. Tube 82 is attached to 15 shaft 14 by adhesive 84, which in the preferred embodiment is cyanoacrylate. This seals the interior of tube 82 from interior balloon 16. Tip tube 82 extends distally through the distal end 84 of balloon 16. Distal end 84 of balloon 16 is bonded to tube 82 by adhesive, 20 which in the preferred embodiment is an ultraviolet cured adhesive. In turn, tube 82 is bonded to coil 82 by adhesive.
The structure of catheter 10 provides a free moving guidewire within spring 72 so that the catheter is not 25 susceptible to balloon wrap. When shaft 14 is rotated, it moves freely within lumen 42 of body spring 40 and within tip spring 72. If shaft 42 is overturned by the user of the catheter, the torque is taken up in spring 72 and not transmitted to balloon 16. Both proximal section 30 76 and distal section 78 of tip spring 72 are loosely wound springs which will absorb the torquing effect.
This allows multiple turns of shaft 14 without affect on balloon 16.
As a reminder to the physician to return shaft 14 to 35 the center position, means are provided to indicate the number of turns made. In manifold 20, WO91/13649 ~ 7 8 PCT/US91/01571 shaft 14 is attached to strain relief means 90. Shaft 14 continues through lumen 92 through silicone seal 9~. A
threaded lumen 95 has female threads 96. Guidewire housing 97 has male threads which mate with threads 98.
5 The interacting threads s~ueeze silicone seal 94 to prevent backflow of fluid out of lumen 92.
Guidewire housing 97 has a longitudinal groove lO0 which has a semicircular cross section. Rotatable handle 28 is mounted over second housing 97. Rotatable handle lO 28 is held to guidewire housing 97 by spring clip 104.
Rotatable handle 28 has a bore 105 which is cut with helical threads 106. The cross section of helical thread 106 is a semicircle matching in diameter the cross section of longitudinal groove lO0. A ball llO is 15 mounted to ride within groove lO0 and helical threads 108. As rotatable handle 28 is turned relative to guidewire ~housing 97, ball llO follows helical grooves 106 and moves, correspondingly, up and down longitudinal groove lO0. When ball llO reaches an end of groove lO0, 20 handle 28 can no longer rotate in that direction.
Therefore, the amount of turn of rotatable handle 28 relative to housing 97 depends on the number of turns of helical groove 106.
In the embodiment illustrated, there can be four 25 turns in either direction of handle 28. Although balloon twist does not occur in the design illustrated, the limitation on rotation reminds the physician that rotation has occurred in one direction and that further rotation in that direction could occur spring compression 30 in the tip section.

Claims (2)

II. CLAIMS
1. A dilatation catheter comprising:
a torque transmitting shaft;
a flexible body surrounding the shaft;
an inflatable balloon having a proximal end mounted on the flexible body;
a tip spring having a proximal end fixedly mounted to the shaft proximal to the distal end of the balloon and a distal end fixedly attached to a distal tip of the shaft; and a tip tube having a proximal end fixedly mounted to the shaft and a distal end extending through the distal end of the balloon, the distal end of the balloon being fixedly attached to the tip tube wherein rotation of the shaft through use of the catheter causes tensioning of the tip spring without significantly affecting the shape of the balloon.
2. The catheter of claim l further comprising a housing having a first body with a male segment with a longitudinal groove;
a second body portion mounted for rotational movement about the male portion of the first body, the second body having a helical groove; and a ball means mounted for movement along the helical groove and along the longitudinal slot so that movement of the first body relative to the second body is stopped when the ball reaches the end of the slot.
CA 2050278 1990-03-16 1991-03-08 Dilatation catheter Abandoned CA2050278A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US49525990 true 1990-03-16 1990-03-16
US07/495,259 1990-03-16
PCT/US1991/001571 WO1991013649A1 (en) 1990-03-16 1991-03-07 Dilatation catheter

Publications (1)

Publication Number Publication Date
CA2050278A1 true true CA2050278A1 (en) 1991-09-17

Family

ID=28456554

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2050278 Abandoned CA2050278A1 (en) 1990-03-16 1991-03-08 Dilatation catheter

Country Status (1)

Country Link
CA (1) CA2050278A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6033381A (en) * 1989-09-06 2000-03-07 Boston Scientific Corporation Angioplasty balloon catheter and adaptor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6033381A (en) * 1989-09-06 2000-03-07 Boston Scientific Corporation Angioplasty balloon catheter and adaptor

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Legal Events

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