WO2023224522A1 - Carte de circuit imprimé flexible conçue pour un cathéter avec une direction de courbure préférée - Google Patents

Carte de circuit imprimé flexible conçue pour un cathéter avec une direction de courbure préférée Download PDF

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Publication number
WO2023224522A1
WO2023224522A1 PCT/SE2023/000006 SE2023000006W WO2023224522A1 WO 2023224522 A1 WO2023224522 A1 WO 2023224522A1 SE 2023000006 W SE2023000006 W SE 2023000006W WO 2023224522 A1 WO2023224522 A1 WO 2023224522A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductors
fpc
bending
s2al
subsets
Prior art date
Application number
PCT/SE2023/000006
Other languages
English (en)
Inventor
Bengt KÄLLBÄCK
Original Assignee
Cathprint Ab
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
Application filed by Cathprint Ab filed Critical Cathprint Ab
Publication of WO2023224522A1 publication Critical patent/WO2023224522A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/0009—Making of catheters or other medical or surgical tubes
    • A61M25/0012—Making of catheters or other medical or surgical tubes with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/118—Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/05—Flexible printed circuits [FPCs]
    • H05K2201/051—Rolled
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/05—Flexible printed circuits [FPCs]
    • H05K2201/055—Folded back on itself
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09218—Conductive traces
    • H05K2201/09263—Meander
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09727—Varying width along a single conductor; Conductors or pads having different widths

Definitions

  • the present invention relates to a flexible and stretchable PCB (FPC) for arranging in a tubular shape adapted for a catheter having a preferred direction of bending according to the introductory portion of the independent claim.
  • FPC flexible and stretchable PCB
  • Catheters are commonly nearly fully circularly symmetrical and may bend in any direction.
  • catheters and catheter like component may have a preferred bending direction, such that it naturally does not tend to bend in a direction opposite the preferred bending direction. This is in catheters known in the art achieved by adding mechanical elements to the catheter that gives it a preferred bending direction.
  • Using an FPC for arranging in a tubular shape with such a catheter will preferably put strain on conductors in the FPC arranged in the bending plane of the catheter, so these conductors suffer an elevated risk of breaking.
  • US2019151616A1, US5304131A and US6102886A all disclose catheters with additional elements comprising a set of slits, giving the catheter a preferred bending direction.
  • EP3653254A1 discloses a catheter with an additional central plane element, giving the catheter a preferred bending direction out of the plane of theplane element
  • An object of the invention is therefore to provide an FPC for arranging in a tubular shape having an adaptation to a preferred direction of bending.
  • the adaptation may be constituted by a tolerance to bending in a given bending direction, reducing the risk of conductors breaking.
  • the adaptation may also be constituted by a preferred direction of bending which require no additional elements for achieving this preferred direction of bending.
  • the adaptation may further be constituted by both a tolerance to bending in a given bending direction and by a preference for a preferred direction of bending.
  • the invention relates to an elongated FPC (1) formed into a tubular shape, where the elongated FPC (1) at least comprises a set of conductors s2al-2, 2b 1-2 primarily extending in the direction of the elongated FPC 1.
  • the conductors s2al-2, 2b 1-2 have a resistance to bending in the plane of the flat FPC 1.
  • the set of conductors s2al-2, 2b 1-2 is divided into four consecutive subsets of conductors s2al-2, 2bl-2.
  • the total resistance to bending in the plane of the flat FPC 1 of the first and third subsets of conductors 2b 1-2 is different from the total resistance to bending in the plane of the flat FPC 1 of the second and fourth subsets of conductors s2al-2.
  • At least one of the conductors s2al-2, 2b 1-2 is meandering.
  • the average meandering amplitude of the first and third subsets of conductors 2b 1- 2 is different from average meandering amplitude of the second and fourth subsets of conductors s2al-2.
  • the total width of the first and third subsets of conductors 2b 1-2 is different from the total width of the second and fourth subsets of conductors s2al-2. This advantageously primarily gives a catheter comprising such an FPC a preferred bending direction.
  • the invention further relates to such an elongated FPC 1 formed into a tubular shape.
  • the first and third subsets of conductors 2b 1-2 are arranged on opposite sides of the tubularly shaped FPC 1 while the second and fourth subsets of conductors s2al-2 are arranged on opposite sides of the tubularly shaped FPC 1.
  • Fig. 1 shows a first embodiment of an FPC according to the invention rolled into a tubular shape
  • Fig. 2 shows the first embodiment of the FPC according to the invention in a flat state
  • Fig. 3 shows a second embodiment of an FPC according to the inventionin a flat state
  • Fig. 4 shows a third embodiment of an FPC according to the inventionin a flat state
  • Fig. 5 shows a fourth embodiment of an FPC according to the inventionin a flat state
  • Catheters are commonly nearly fully circularly symmetrical and may bend in any direction.
  • catheters and catheter like component have a preferred bending direction, such that it naturally does not tend to bend in a direction opposite the preferred bending direction.
  • This is in catheters known in the art typically achieved by adding mechanical elements to the catheter that gives it a preferred bending direction.
  • Adding an additional component increases the cost and size of the catheter, so achieving the same result by designing electrical conductors in the catheter in such a manner that it gives the catheter a preferred bending direction is advantageous, reducing the need for additional mechanical components and not adding to the size.
  • Using an FPC for arranging in a tubular shape with such a catheter will preferably put strain on conductors in the FPC arranged in the bending plane of the catheter, so these conductors suffer an elevated risk of breaking.
  • the embodiments demonstrate an adaptation to a preferred bending direction and/or a tolerance to a preferred bending direction, where each embodiment has a degree of preference for a preferred bending direction and a degree of tolerance to a given bending direction.
  • the proportions between the degree of preference and the degree of tolerance varies from embodiment to embodiment, so generally the degree of preference and the degree of tolerance is here jointly denoted adaptation to a preferred bending direction.
  • the adaptation may be constituted exclusively by a degree of tolerance to a preferred bending direction, and then the preferred bending direction is generated by other elements in the catheter, external to the FPC itself.
  • a good way of achieving a tolerance to a preferred bending direction and/or a preference for preferred bending direction is by producing elongated rectangular flexible and stretchable circuit boards, FBCs, with a set of conductors extending along the long axis of the FPC and rolling the FPC into a tubular shape.
  • Fig. 1 shows such an FPC primarily with a preferred bending direction rolled into a tubular shape.
  • the conductors can be arranged in a number of different ways, achieving the preferred bending direction in the FPC rolled into a tubular shape, and figs 2-5 illustrates four examples of how the conductors may be arranged.
  • the FPC rolled into a tubular shape would have to be fixed into such a tubular shape, using reheating the FPC, using an adhesive or in some other way.
  • the FPC may of course in addition to the conductors extending along the long axis of the FPC comprise other conductor components such as electrodes or active electronic components, but these or not illustrated.
  • the FPC fixed in a tubular shape may itself constitute a catheter, but it may alternatively constitute only a component in a catheter and be affixed to other elongate elements in the catheter, but this is not illustrated here.
  • Fig. 1 shows a first embodiment of an FPC 1 according to the invention rolled into a tubular shape, forming a tube.
  • the FPC 1 is provided with a set of conductors 2a 1-2, 2b 1 of varying widths.
  • the widest conductors are arranged on what in the figure is the top and the bottom of the tube, that is the furthest from the centre of the tube in the direction of the x-axis illustrated.
  • the narrowest conductors are arranged on what in the figure is side of the tube facing the viewer and on the opposite side, not seen in the figure, that is the furthest from the centre of the tube in the direction of the y-axis illustrated.
  • the conductors are typically thinner than their width, and this is more pronounced for the wider conductors. They are therefore easier to bend out of the plane in which they extend that in the plane they extend, and this is more pronounced the wider they are.
  • the tube With the widest conductors on the top and bottom of the tube, the tube may much more easily be bent upwards and downward, that is along the x-axis, than sideways, that is along the y-axis. The preferred bending direction of the tube is thus along the x-axis.
  • Fig. 2 shows the first embodiment of the FPC1 according to the invention in a flat state.
  • the set of conductors 2al-2, 2bl-2 can be subdivided into four bands with a first set of narrower conductors 2b 1, followed by a first set of wider conductors 2a 1, followed by a second set of narrower conductors 2b2, finally followed by a second set of wider conductors 2a2.
  • the distribution of widths nearly adheres to a continuous periodical curve with a wavelength corresponding to half the width of the FPC, in turn corresponding to the circumference of the FPC rolled into a tubular form.
  • the two sets of conductors 2al-2 with the largest width end up on opposite sides of the tube, while two sets of conductors 2b 1-2 with the narrowest width end up on opposite sides of the tube, with each two consecutive sets of narrow and wide conductors shifted 90 degrees apart.
  • Fig. 3 shows a second embodiment of an FPC primarily with a preferred bending direction according to the invention in a flat state.
  • each conductor is of equal width, but they are instead arranged with a varying density, so nearer or more distantly to the adjacent conductors.
  • the set of conductors 2a 1-2, 2b 1-2 can be subdivided into four bands with a first set of conductors 2b 1 spaced apartmore distantly, followed by a first set of conductors 2a 1 densely spaced, followed by a second set of conductors 2b2 spaced apart more distantly, finally followed by a second set of conductors 2a2 densely spaced.
  • the distribution of conductor density nearly adheres to a continuous periodical curve with a wavelength corresponding to half the width of the FPC, in turn corresponding to the circumference of the FPC rolled into a tubular form.
  • Fig. 4 shows a third embodiment of an FPC primarily with a preferred bending direction according to the invention in a flat state.
  • the conductors are meandering. As the catheter is bent, conductors on one side of the catheter is drawn out while conductors on the opposite side are contracted, and this may cause conductors to break. Meandering conductors are more tolerant to this contraction or expansion, so using meandering conductors a catheter which allows a higher degree of bending than what is possible for catheters with straight conductors is achieved.
  • All conductors are of the same width and meanders with the same amplitude.
  • the meanders occur in phase, such that the troughs of adjacent conductors are aligned and the peaks of adjacent conductors are aligned.
  • This advantageously means that conductors may be arranged as densely as conductors with straight conductors, such as in the second embodiment.
  • the figure clearly shows that the set of meandering conductors 2al-2, 2b 1-2 can be subdivided into four bands with a first set of meandering conductors 2b 1 spaced apart more distantly, followed by a first set of meandering conductors 2a 1 densely spaced, followed by a second set of meandering conductors 2b2 spaced apart more distantly, finally followed by a second set of meandering conductors 2a2 densely spaced.
  • the distribution of conductor density nearly adheres to a continuous periodical curve with a wavelength corresponding to half the width of the FPC, in turn corresponding to the circumference of the FPC rolled into a tubular form.
  • Fig. 5 shows a fourth embodiment of an FPC with primarily with a particular tolerance to bending in the preferred bending direction coinciding with a preferred bending direction according to the invention in a flat state.
  • the conductors are meandering, but they are meandering with varying amplitude.
  • meandering conductors meandering with a low amplitude have a lower tolerance against lengthwise extension of the conductors
  • meandering conductors meandering with a higher amplitude have a higher tolerance against lengthwise extension of the conductors. This in turn gives a corresponding higher and lower tolerance to bending, as bending generates such an extension of the conductors that varies radially.
  • the reason for the varying tolerance to bending of a meandering conductor is its varying effective length, conductors meandering with a higher amplitude giving opportunity for more slack.This is what gives the fourth embodiment a particular tolerance to bending in the preferred bending direction
  • meandering conductors meandering with a low amplitude act less against bending in the plane of the conductors
  • meandering conductors meandering with a higher amplitude acts more strongly against bending in the plane of the conductors.
  • the reason for this is of course that a meandering conductor has a distribution component directed orthogonally to the conductor’s longitudinal direction, and this orthogonal component becomes larger as the amplitude of the meandering increases. It is as if the meandering conductor has an effective width corresponding to the varying widths of the straight conductors in the first embodiment.This is what in addition gives the fourth embodiment a preference for bending in the preferred bending direction
  • All conductors are of the same width and meanders with the same frequency but with varying amplitude.
  • the meanders occur in phase, such that the troughs of adjacent conductors are aligned and the peaks of adjacent conductors are aligned.
  • This advantageously means that conductors may be arranged more densely than conductors with straight conductors of varying width, such as in the first embodiment, although less densely than conductors with meandering conductors with varying meandering amplitude, such as in the third embodiment.
  • the figure clearly shows that the set of meandering conductors 2al-2, 2bl-2 can be subdivided into four bands with a first set of meandering conductors 2bl meandering with a lower meandering amplitude, followed by a first set of meandering conductors 2a 1 meandering with a higher meandering amplitude, followed by a second set of meandering conductors 2b2 meandering with a lower meandering amplitude, finally followed by a second set of meandering conductors 2a2 meandering with a higher meandering amplitude.
  • the distribution of meandering amplitude nearly adheres to a continuous periodical curve with a wavelength corresponding to half the width of the FPC, in turn corresponding to the circumference of the FPC rolled into a tubular form.
  • the width, density and meandering amplitude of the conductors changes from side to side of the flat FPC corresponding to a variation around the periphery of the tubular FPC.
  • other alternative ways of arranging such a variation in resistance to bending and tolerance to bending in the plane of the flat FPC are possible, such as varying thickness of the conductors.
  • these methods of causing a variation in resistance to bending and tolerance of bending in the plane of the flat FPC can be combined in many different ways, such as a concurrent conductor to conductor variation in width in combination with meandering amplitude or variation in density in combination with meandering amplitude.
  • the distribution of resistance to bending and tolerance of bending in the plane of the flat FPC nearly adheres to a continuous periodical curve with a wavelength corresponding to half the width of the FPC.
  • the conductors are discrete elements, the distribution of resistance to bending and tolerance to bending is not fully continuous but occurs in a step-wise fashion.
  • the continuous periodical curve to which distribution of resistance to bending adheres may itself be arranged with discontinuous steps.
  • the set of conductors 2al-2, 2bl-2 can be subdivided into four bands with a first set of narrower conductors 2b 1 identical to each other, followed by a first set of wider conductors 2a 1 identical to each other, followed by a second set of narrower conductors 2b2 identical to each other, finally followed by a second set of wider conductors 2a2 all identical to each other.
  • the resistance to bending and tolerance to bending in the plane of the flat FPC is identical for the first and third sets of conductors, while the resistance to bending in the plane of the flat FPC is identical for the second and fourth sets of conductors. Obviously, this does not have to be the case. Instead the total resistance to bending and tolerance to bending in the plane of the flat FPC must be higher for the first and third sets of conductors and lower for the second and fourth sets of conductors or oppositely the total resistance to bending in the plane of the flat FPC may be lower for the first and third sets of conductors and lower for the second and fourth sets of conductors.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Pulmonology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Structure Of Printed Boards (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

L'invention concerne une carte de circuit imprimé allongée (1) formée en une forme tubulaire, qui comprend un ensemble de conducteurs (s2al-2, 2bl-2) s'étendant dans la direction de la carte de circuit imprimé allongée (1). L'ensemble de conducteurs (s2al-2, 2bl-2) est divisé en quatre sous-ensembles consécutifs de conducteurs (s2al-2, 2b 1 - 2). La résistance totale à la flexion dans le plan de la carte de circuit imprimé plate (1) des premier et troisième sous-ensembles de conducteurs (2b 1-2) est différente de la résistance totale à la flexion dans le plan de la carte de circuit imprimé plate (1) des deuxième et quatrième sous-ensembles de conducteurs (s2al-2). Ceci permet d'obtenir un cathéter comprenant une telle carte de circuit imprimé enroulée en une forme tubulaire, et adaptée à une direction de flexion préférée. Dans un mode de réalisation de l'invention, au moins un des conducteurs (s2al-2, 2b 1-2) est méandrique. L'amplitude de méandres moyenne des premier et troisième sous-ensembles de conducteurs (2b 1-2) est différente de l'amplitude de méandres moyenne des deuxième et quatrième sous-ensembles de conducteurs (s2al-2). Dans un autre mode de réalisation de l'invention, la largeur totale des premier et troisième sous-ensembles de conducteurs (2b 1-2) est différente de la largeur totale des deuxième et quatrième sous-ensembles de conducteurs (s2al-2).
PCT/SE2023/000006 2022-05-16 2023-05-12 Carte de circuit imprimé flexible conçue pour un cathéter avec une direction de courbure préférée WO2023224522A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SESE2230148-5 2022-05-16
SE2230148A SE2230148A1 (en) 2022-05-16 2022-05-16 Flexible PCB adapted for catheter with preferred direction of bending

Publications (1)

Publication Number Publication Date
WO2023224522A1 true WO2023224522A1 (fr) 2023-11-23

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PCT/SE2023/000006 WO2023224522A1 (fr) 2022-05-16 2023-05-12 Carte de circuit imprimé flexible conçue pour un cathéter avec une direction de courbure préférée

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SE (1) SE2230148A1 (fr)
WO (1) WO2023224522A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6433284B1 (en) * 2000-07-25 2002-08-13 Advanced Flexible Circuits Co., Ltd. Partially cut multi-planar flexible printed circuit
US20110255249A1 (en) * 2010-04-20 2011-10-20 General Electric Company High density flexible foldable interconnect
WO2013074036A1 (fr) * 2011-11-16 2013-05-23 Cathprint Ab Composant de cathéter
WO2013154684A1 (fr) * 2012-04-09 2013-10-17 St. Jude Medical, Atrial Fibrillation Division, Inc. Faisceau de câbles flexible multidirectionnel pour dispositifs médicaux
WO2016130713A1 (fr) * 2015-02-10 2016-08-18 Cathprint Ab Dispositif médical à profil mince doté d'un circuit flexible intégré et et ses procédés de fabrication
JP2021057390A (ja) * 2019-09-27 2021-04-08 住友電工プリントサーキット株式会社 フレキシブルプリント配線板及び配線部材

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6433284B1 (en) * 2000-07-25 2002-08-13 Advanced Flexible Circuits Co., Ltd. Partially cut multi-planar flexible printed circuit
US20110255249A1 (en) * 2010-04-20 2011-10-20 General Electric Company High density flexible foldable interconnect
WO2013074036A1 (fr) * 2011-11-16 2013-05-23 Cathprint Ab Composant de cathéter
WO2013154684A1 (fr) * 2012-04-09 2013-10-17 St. Jude Medical, Atrial Fibrillation Division, Inc. Faisceau de câbles flexible multidirectionnel pour dispositifs médicaux
WO2016130713A1 (fr) * 2015-02-10 2016-08-18 Cathprint Ab Dispositif médical à profil mince doté d'un circuit flexible intégré et et ses procédés de fabrication
JP2021057390A (ja) * 2019-09-27 2021-04-08 住友電工プリントサーキット株式会社 フレキシブルプリント配線板及び配線部材

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