EP1115930A1 - Dispositif permettant de fabriquer un stent - Google Patents

Dispositif permettant de fabriquer un stent

Info

Publication number
EP1115930A1
EP1115930A1 EP99948865A EP99948865A EP1115930A1 EP 1115930 A1 EP1115930 A1 EP 1115930A1 EP 99948865 A EP99948865 A EP 99948865A EP 99948865 A EP99948865 A EP 99948865A EP 1115930 A1 EP1115930 A1 EP 1115930A1
Authority
EP
European Patent Office
Prior art keywords
rotating body
thread
winding core
connecting means
elements
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.)
Withdrawn
Application number
EP99948865A
Other languages
German (de)
English (en)
Inventor
Oleg Afanasevic Burlakov
Natalja Aleksandrovna Saczerinskaja
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.)
LS-Medcap GmbH
LS MedCap GmbH
Original Assignee
LS-Medcap GmbH
LS MedCap GmbH
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 LS-Medcap GmbH, LS MedCap GmbH filed Critical LS-Medcap GmbH
Publication of EP1115930A1 publication Critical patent/EP1115930A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/06—Braid or lace serving particular purposes
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C3/00—Braiding or lacing machines
    • D04C3/02—Braiding or lacing machines with spool carriers guided by track plates or by bobbin heads exclusively
    • D04C3/38—Driving-gear; Starting or stopping mechanisms
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C3/00—Braiding or lacing machines
    • D04C3/40—Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances
    • D04C3/42—Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances with means for forming sheds by controlling guides for individual threads
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C3/00—Braiding or lacing machines
    • D04C3/48—Auxiliary devices
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/06—Vascular grafts; stents

Definitions

  • the invention relates to a device for producing a stent from a number of thread-like elements.
  • a stent In the medical field, a stent is used to be implanted in hollow bodies in the human body, in particular in blood vessels, such as veins, arteries or the like, which have pathological constrictions or which are narrowed around these vessels by an external pressure acting on the vessel wall keep open and maintain their function.
  • the stents for implantation in blood vessels are elongated hollow bodies, the outer diameter of which corresponds approximately to the clear inner diameter of the respective blood vessel into which the stent is to be implanted, or more precisely, is somewhat larger than this, in order to keep the vessel open for the passage of Ensure blood.
  • Such stents are made from a number of thread-like elements, for example in the form of thin steel wires. Compared to stents made from steel wire, stents made from nitinol wire have proven particularly useful.
  • the thread-like elements are wound according to a winding scheme in which a first system of thread-like elements is wound in the longitudinal direction of the stent to be produced in accordance with a first co-directional screw system, while a second system of thread-like elements are wound in accordance with a second co-directional system but in opposite directions the first system of thread-like elements are wound so that the thread-like elements of the first system cross with the thread-like elements of the second system at a plurality of crossing points.
  • the thread-like elements can be fixed to one another at the crossing points, for example by soldering, gluing, welding, or by means of rivets.
  • Fixation of the thread-like elements to one another can also be achieved, however, by intertwining the two systems of thread-like elements into a braid, by intertwining the two crossing systems of the thread-like elements in such a way that each thread-like element of one system is guided alternately above and below each thread-like element of the other system.
  • a weave of the braid is called a canvas weave.
  • stents have been produced by continuously winding the thread-like elements into a tubular structure, from which individual stents are then cut to length. This results in the disadvantage that the stents produced, after cutting, have unfixed ends of thread-like elements on their two longitudinal ends, which then have to be fixed to one another in a further working step.
  • the stents prefferably be manufactured in such a way that the braid is closed at one end, that is to say that the two systems of thread-like elements, which are wound in opposite directions helically, are integrally connected to one another at at least one end.
  • Such stents, the braid of which is closed at one end, can be left have so far not been produced mechanically, since no suitable devices are known.
  • the invention is therefore based on the object of providing a device of the type mentioned at the outset, which makes it possible to produce individual stents, the braid of which is closed at one end.
  • the object is achieved with regard to the device mentioned at the outset in that the device has a winding core, a first rotating body and a second rotating body, the first rotating body and the second rotating body being arranged around the winding core and being rotatable in opposite directions to one another about the longitudinal axis of the winding core , wherein the first rotating body has a number of first connecting means for connecting a first end section of the thread-like elements to the first rotating body and the second rotating body has a number of second connecting devices for connecting a second end section of the thread-like elements to the second rotating body , and that the winding core and the two rotating bodies can be moved relative to one another in the longitudinal direction of the winding core.
  • the stent is accordingly produced by winding the thread-like elements around the winding core in two opposite directions of rotation.
  • Each thread-shaped element is connected to the first rotating body with its first end section via one of the first connecting means and to the second rotating body with its second end section via one of the second connecting means.
  • both end sections of each thread-like element are therefore wound in opposite directions with respect to the direction of rotation, but in the same direction with respect to the longitudinal direction, so that the stent produced has no open, freely projecting thread ends at one end.
  • a stent is formed, one end of which has a closed braid, that is to say that at the end of the winding core that begins in the winding direction, the thread-like elements have no interruptions, but deflection points at which the system of the first end sections merges in one piece with the system of the second end sections .
  • the number of filamentary elements used to manufacture the stent is thus halved compared to the number of filamentous elements in the conventional devices.
  • the device according to the invention also has the advantage of being technically very simple and therefore inexpensive to manufacture. The object underlying the invention is thus completely achieved.
  • the winding core has radially protruding removable pins at one end for holding a central section of the thread-like elements.
  • the pins fix one end of the stent being manufactured on the winding core during the production of the stent, so that the end sections can be wound tightly in the longitudinal direction of the winding core with the required tensile force. Because the pins are removable, the stent produced with the device according to the invention can be easily pulled off the winding core after the pins have been removed.
  • first connecting means and the second connecting means are arranged at approximately the same height with respect to the longitudinal direction of the winding core.
  • first end sections and the second end sections seen in the longitudinal direction of the winding core, can be wound helically around the winding core with approximately the same pitch, so that the stent can be produced with a particularly uniform braid structure.
  • first connecting means are arranged radially within the second connecting means and are connected to the first rotating body such that the second end sections of the thread-like elements can run above and below the first connecting means when the rotating bodies are rotated.
  • first connecting means are designed as boats, which lie loosely on the first rotating body.
  • the advantage here is that the interweaving of the thread-like elements is achieved with structurally particularly simple means. Characterized in that the boats rest loosely on the first rotating body, the second end sections under the Pass through boats, which are slightly raised by the second end section when passing through.
  • the shuttle can be tilted back and forth about an axis that is radially directed with respect to the winding core.
  • the tilting direction of the boats when crossing the second end sections with the first end sections can determine whether the second end section passes over the first end section or below the first end section. If the end of a boat leading in the direction of rotation is tilted downwards, the second end section is guided over the first end section. If, on the other hand, the end of a boat leading in the direction of rotation is tilted upwards, the second end section can pass under the first end section.
  • the tilting of the shuttle thus represents a "threading aid".
  • Tilting mechanism which controls the shuttle by the rotational movement of the rotating body when rotating the
  • Rotating body alternately tilted back and forth by an angle of rotation, which corresponds to an angle of 360 ° divided by the number of first end sections of the shaped elements.
  • the advantage here is that the tilting of the shuttle takes place automatically when the rotating body is rotated. If, for example, six thread-like elements are used, the leading end of each boat is accordingly rotated when the Rotating body tipped by about 60 ° down, in the subsequent rotation by another 60 ° up, then down again, etc., so that each first end section is alternately guided above and below every second end section.
  • the tilting mechanism for each shuttle has an actuating element which is arranged under an end of the shuttle which advances in the direction of rotation and is arranged under an end of the shuttle which follows in the direction of rotation, the actuating elements alternating with the preceding and when rotating the rotating bodies by the aforementioned angle of rotation the trailing end of the boat are pressed.
  • a structurally particularly simple tilting mechanism for tilting the shuttle is advantageously achieved.
  • the actuators are thus arranged with respect to the tilt axis of the shuttle so that they form a lever arm with the tilt axis.
  • the actuating elements are designed as balls, which are received in cylindrical bores of the first rotating body and rest on the second rotating body, individual elevations being arranged on the second rotating body at a distance from one another, which pass under the balls when the rotating bodies rotate and the balls press against the leading or trailing end of the shuttle.
  • the elevations are formed with bevels.
  • the advantage here is that the balls can run up gently on the run-up slopes, which further improves the smoothness of the tilting mechanism.
  • the first connecting means taper at their end that leads in the direction of rotation.
  • the second end sections of the thread-like elements can pass specifically and safely above and below the first connecting means without the second end sections getting stuck on the first connecting means and thus blocking the opposite rotational movement of the rotating bodies, or that the end sections tear off in the process .
  • first connecting means and / or the second connecting means have coils, on each of which a supply length of the first end sections or of the second end sections of the thread-like elements is wound up.
  • first and the second connecting means keep the first and the second end sections under tension when they are wound around the winding core.
  • the advantage achieved here is that the thread-like elements can be wound tightly around the winding core, so that the braid structure of the stent to be produced is always uniform and has no loose or loose parts.
  • the second connecting means each have a thread guide in the form of a slot or a deflection roller, and are the second End sections weighted down by a loosely suspended weight.
  • a first drive mechanism is provided for rotating the two rotating bodies in opposite directions, which drives the two rotating bodies in opposite directions at essentially the same rotational speed.
  • first and the second end sections of the thread-like elements can be wound around the winding core with uniform tension.
  • the first drive mechanism has two drive disks, each with a toothing, the first drive disk being connected to the first rotating body and the second drive disk being connected to the second rotating body, the toothing of the drive disks being arranged opposite one another and together with one Comb tooth body, which is connected to a drive shaft.
  • This measure creates a structurally particularly simple drive mechanism for driving the rotating bodies, which moreover manages with a single drive shaft in order to set the two rotating bodies in rotation in opposite directions, as a result of which the drive mechanism is of a structurally very simple design.
  • the drive shaft is connected to a hand crank.
  • the advantage of this measure is that the operator can immediately interrupt the drive of the rotating bodies in the event of a malfunction.
  • the operator can easily determine faults, for example when the force for turning the hand crank increases.
  • the drive shaft is connected to an electric motor.
  • the advantage here is that the operator only has to carry out the preparatory work by hand, i.e. insert the thread-like elements into the device and make the device ready for operation while the winding itself is accomplished by the electric motor, so that the operator can already prepare a next device accordingly while the one stent is being wound.
  • a second drive mechanism for moving the rotating bodies in the longitudinal direction of the winding core relative to the winding core is provided, which is in such a manner with the first drive mechanism for rotating the rotating bodies is coupled that when the rotating body of the winding core and the rotating body are simultaneously moved in the longitudinal direction of the winding core.
  • the advantage here is that only one drive mechanism is required for the two types of movement of the device, so that the construction of the device according to the invention is further simplified.
  • the second drive mechanism has a fixed spindle, in the thread of which a guide pin is positively guided, which is non-rotatably connected to the first or second drive disk.
  • the path length by which the rotating bodies are moved in the longitudinal direction of the winding core relative to the latter with a full rotation of the rotating core can be adjusted.
  • the angle of inclination, at which the thread-like elements run crosswise in the longitudinal direction of the stent is adjustable.
  • the device according to the invention can therefore be used to produce stents with an inclination angle which can be set as desired, for example in a range from 60 ° to 150 °.
  • the spindle is interchangeable, and several spindles with different thread pitches are provided.
  • This measure enables the path length through which the rotating bodies are moved in the longitudinal direction of the winding core relative to the latter with a full rotation of the winding core around the winding core in a structurally advantageously simple manner, so that the device can be adapted to the particular stent type to be produced can.
  • the winding core can be exchanged, several winding cores with different outer contours being provided for producing stents of different shapes.
  • the winding core specifies the geometric shape of the stent that is produced with the device, it is advantageous here that stents with different shapes can be produced.
  • the winding core can have a radial widening at its end that begins in the winding direction in order to produce a stent with a radially expanding crown.
  • stents can also be produced which have a radial taper in their central region in the longitudinal direction.
  • FIG. 1A and 1B show a longitudinal sectional view of a device according to the invention in two partial images
  • FIG. 2 shows an illustration corresponding to FIG. 1A of the device in FIG. 1 in an operating state that is advanced compared to FIG. 1A during the production of a stent, the rotational position between a first rotating body and a second rotating body being changed compared to FIG. 1A;
  • Figure 3 is a plan view of the first and the second rotating body of the device in isolation.
  • FIG. 4 shows a top view of the first and second rotating bodies, first connecting means being omitted compared to FIG. 3;
  • 6 and 7 each show a plan view of the first and the second rotating body, these representations showing the functioning of a tilting mechanism for tilting the first connecting means; 8a) and b) schematic representations of the operation of the tilting mechanism in a side view;
  • FIGS. 9 and 10 are plan views of the first and the second rotating body, in which the running over and under one another of end sections of thread-like elements of the stent to be produced is illustrated;
  • FIG. 13 shows a section along the line XIII-XIII in FIG. 6;
  • FIG. 15 shows a detailed illustration of a section of the stent in FIG. 14.
  • FIGS. 1A and IB an apparatus for producing a stent from a number of thread-like elements, which is provided with the general reference number 10, is shown in two partial images.
  • a stent provided with the general reference symbol 200 and produced with the device 10 is first described in more detail with reference to FIGS. 14 and 15.
  • the stent 200 is used for implantation in a blood vessel, such as a vein or artery, in the human body.
  • the stent 200 has a hollow cylindrical body which is open on both sides in the longitudinal direction for the passage of blood.
  • the stent 200 is made up of thread-like elements 202, here made of nitinol wire.
  • the thread-like elements 20 are intertwined to form a braid which has a multiplicity of rhomboid-shaped cells.
  • each thread-shaped element 202 leads from a first end 204 with a first end section 206 in a first helix and with a second end section 208 in a helix opposite to the first helix to an end 210 opposite the first end 204 is.
  • the first end section 206 and the second end section 208 are connected to one another in one piece and form a deflection section which represents the central section of each thread-like element 202.
  • the first end sections 206 guided according to the first helix cross over the end sections 208 guided according to the second helix at intersection points 212.
  • the stent 200 is made up of a total of six thread-like elements 202 and accordingly has six first end sections 206 and six second end sections 208.
  • first end sections 206 and the second end sections 208 are fixed to one another in pairs by their free ends 214 and 216 by means of a knot or the like.
  • the braid is formed closed by the one-piece connection of the first end sections 206 and the second end sections 208, so that no further fixing measures have to be taken there.
  • first end sections 206 and the second end sections 208 viewed in the longitudinal direction of the stent 200, cross at an angle of inclination ⁇ .
  • the braid of the stent 200 is formed such that each of the first end sections 206 of the thread-like elements 202 is crossed with each other end section 208 of the thread-like elements 202 alternately above and below one another at the crossing points 212.
  • Such a braided structure of a braid is called a canvas weave.
  • the device 10 with which the stent 200 can be produced has a first rotating body 12, a second rotating body 14 and a winding core 16.
  • the winding core 16 is arranged around and can be rotated in opposite directions about a longitudinal axis 18 of the winding core 16, the direction of rotation of the first rotating body 12 being illustrated by an arrow 20 and the direction of rotation of the second rotating body 14 being illustrated by an arrow 22.
  • the first rotating body 12 has a number of first connecting means 24, via which first end sections 26 of the thread-like elements are connected to the first rotating body 12.
  • the second rotating body 14 has a number of second connecting means 28, via which in each case second end sections 30 of the thread-like elements are connected to the second rotating body 14.
  • “connected” means that the end sections 26 and 30 follow the rotational movement of the rotating bodies 12 and 14 when the rotating bodies 12 and 14 respectively assigned to them rotate in the opposite direction, i.e. be wound around the winding core 16.
  • the first connecting means 24 are arranged distributed over the circumference of the first rotating body 12, specifically a total of six, six first connecting means 24 are provided on the first rotating body 12 in accordance with the number of thread-like elements.
  • six second connecting means 28 are provided on the second rotating body 14.
  • Each thread-like element extends with its first end section 26 from the first connecting means 24, which is associated with the thread-like element, to the winding core 16 and from there with its second end section 30 to the second connecting means 28.
  • the winding core 16 has, at its upper end in FIG. 1A, circumferentially distributed detachable pins 32 for holding a central section of the thread-like elements, in that each thread-shaped element is placed over one of these pins 32.
  • the aforementioned middle sections form the first end 204 of the stent 200 with the aforementioned deflection points.
  • the first connecting means 24 and the second connecting means 28 are arranged at approximately the same height with respect to the longitudinal direction of the winding core 16.
  • the winding core 16 is arranged non-rotatably and has a cylindrical contour.
  • the winding core 16 and the two rotating bodies 12 and 14 can also be moved relative to one another in the longitudinal direction of the winding core 16.
  • the winding core 16 itself is designed to be axially stationary, while the rotating bodies 12 and 14 are axially movable.
  • the first rotating body 12 and the second rotating body 14 are axially immovable relative to one another, so that the first and second connecting means 24 and 28 are always at approximately the same height.
  • first drive mechanism 33 is first described, by means of which the opposite rotational movement of the two rotating bodies 12 and 14 to each other is made possible.
  • the first rotating body 12 is connected in a rotationally fixed manner to an inner tube 36 by means of a fastening ring 34.
  • the inner tube 36 is connected at its lower end to a first drive pulley 40 via a sleeve 38.
  • the second rotating body 14 is in turn connected in a rotationally fixed manner to an outer tube 42, the lower end of which is connected in a rotationally fixed manner to a second drive disk 44.
  • the inner tube 36 and the outer tube 42 are rotatably supported on one another at their upper end by means of a bearing sleeve 46 and at their lower end by means of a further bearing sleeve 48.
  • the first drive disk 40 has on its outer circumference a toothing 50 pointing downwards, the teeth of which are directed radially.
  • the second drive pulley 44 On its outer circumference, the second drive pulley 44 likewise has an upwardly facing toothing 52 with radially directed teeth, which is arranged opposite the toothing 50.
  • the teeth 50 and 52 mesh together with a toothed body 54, which is non-rotatably seated on a drive shaft 56, which in turn is connected to a crank handle 58.
  • the opposite arrangement of the teeth 50 and 52 has the effect that when the hand crank 58 is rotated about a longitudinal axis 60 of the drive shaft 56 in the direction of an arrow 62, the first drive disk 40 and thus the first Rotating body 12 viewed from above are rotated clockwise, while the second drive pulley 44 and thus the second rotating body 14 are simultaneously rotated counterclockwise when viewed from above.
  • An opposite rotation of the rotating bodies 12 and 14 is thus achieved by means of only one drive mechanism 33.
  • the speed of rotation of the first rotating body 12 and the speed of rotation of the second rotating body 14 are the same.
  • a second drive mechanism 63 is provided, which is coupled to the first drive mechanism 33 described above.
  • the winding core 16 is fastened to an elongate rod 64 arranged in the inner tube 36.
  • the rod 64 is non-rotatable.
  • the rod 64 is designed as a spindle 66 at its lower end and accordingly has an external thread.
  • a guide pin 68 which is screwed into the sleeve 38 and engages in the thread of the spindle 66, engages in the thread of the fixed, rotatable spindle 66.
  • the guide pin 68 is connected to a handle 70 in order to bring the pin 68 into and out of engagement with the thread of the spindle 66.
  • the arrangement of the first rotating body 12 and the second rotating body 14 as well as the inner tube 36 and the outer tube 42 are supported on the spindle 66 in the axial direction via the guide pin 68. Since the guide pin 68 is connected in a rotationally fixed manner to the sleeve 38, the sleeve 38 is in turn connected in a rotationally fixed manner to the first drive disk 40, causing the first drive disk 40 to rotate by actuating the hand crank 58 in FIG already mentioned direction of rotation according to arrow 62, that the guide pin 68 runs downward in the thread of the spindle 66, and thus the rotating bodies 12 and 14 are moved downward.
  • FIG. 1A and IB show an operating state of the device 10, in which the rotating bodies 12 and 14 are shown in an upper position, from which they are moved downward in the opposite direction during the winding of the stent on the winding core 16.
  • 2 shows an operating state of the device 10, in which the stent is already partially wound and the first rotating body 12 and the second rotating body 14 have been moved downward by the wound partial length of the stent.
  • FIG. 2 shows a rotational position between the first rotating body 12 and the second rotating body 14 that is changed compared to FIG. 1A.
  • the hand crank 58 with the drive shaft 56 and the tooth body 54 are arranged on a sliding block 72 which slidably sits on a rod 74.
  • the rod 64 and the slide rod 74 are finally on a common base, not shown. With the base, the device 10 stands overall on a work table, not shown.
  • the first connection means 24 are disposed radially within the second connection means 28 and connected to the first rotating body 12 such that the second end portions 30 of the filamentary elements from which the stent is made are above and below the first connection means 24 can run during the rotational movement of the rotating bodies 12 and 14, which is directed in opposite directions.
  • FIG. 1A illustrates this by way of illustration in an exaggerated manner, in that the first connecting means 24 on the left in FIG. 1A is raised, so that the corresponding second end section 30 can pass under the connecting means 24.
  • the reverse case is shown, namely that the corresponding second end section 30 runs past the first connecting means 24.
  • the second connecting means 28 have thread guides 76, which in the exemplary embodiment are designed as deeply constricted deflection rollers through which the second end sections 30 are guided.
  • the second connecting means 28 furthermore have weights which are loosely suspended on the second rotating body 14 at the second end sections 30.
  • the weights 78 ensure that the second end sections 30 are held between the winding core 16 and the weights 78 under suitable tension.
  • the loose suspension of the weights 78 on the second rotating body 14 enables the second end sections 30 to be guided with a certain amount of play in the vertical direction through the thread guides 76, as a result of which the second end sections 30 run above and below the first connecting means 24 is favored.
  • the play of the second end sections 30 is in FIG. 1A illustrates in principle using the left thread guide 76 and the right thread guide 76.
  • the first connecting means 24 are designed as boats 80, which lie loosely on the first rotating body 12, i.e. are connected to the first rotating body 12 in such a way that the second end sections 30 can pass between the first rotating body 12 and the shuttle 80.
  • the boats 80 have radially outer and radially inner cylindrical pins 82 and 84, via which they are floatingly supported in semi-cylindrical recesses 86 and 88, which are provided in the first rotating body 12.
  • a cover 90 is provided which is placed on the first rotating body 12 and which has recesses corresponding to the recesses 86 and 88, so that the shuttle 80 between the first rotating body 12 and the cover 90 are embedded and held radially immovably by the pins 82 and 84.
  • the cover 90 is removable and is pressed against the first rotating body 12 by means of a further cover 92 during operation of the device 10, the further cover 92 being screwed to the second rotating body 14 via supports 94 which are arranged radially outside the first rotating body 12 .
  • the lid 92 is thus also removable.
  • the cover 90 and the cover 92 each have an opening 96 and 98 in the center, so that when the rotary bodies 12 and 14 are moved vertically, the winding core 16 can be moved through the covers 90 and 92.
  • the lid 90 rotates with the first rotating body 12, while the lid 92 rotates with the second rotating body 14.
  • a ring section 99 of the second cover 92 slides on the Edge of the opening 96 of the first cover 90, wherein the ring section 99 or the edge of the opening 96 can have a ball bearing ring for low-friction mounting.
  • the first connecting means 24 and also the second connecting means 28 have spools, on each of which a supply length of the first end section 26 and the second end section 30 of each thread-like element is wound up.
  • Each thread-like element is accordingly connected to the first connecting means 24 with its first end section 26 and to the second connecting means 28 with its second end section 30, the outermost ends being wound on the spools of the first connecting means 24 and the second connecting means 28, respectively.
  • FIG 11 shows an example of one of the boats 80 that form the first connecting means 24.
  • the boat 80 has a housing 100 in which a coil 102 is rotatably arranged. With the shuttle 80 inserted into the device 10, the axis of rotation of the bobbin 102 runs approximately parallel to the winding core 16. A supply length of the first end section 26 of a thread-like element is wound on the bobbin 102.
  • the coil can be removed from the boat 80, for which purpose a cover plate 104 is provided, which is screwed to the housing 100 by means of a screw 106 in order to hold the coil 102 captively in the housing 100.
  • the bobbin 102 is inhibited in the unwinding direction, ie the thread-like element wound on the bobbin 102, more precisely the wound end section 26, can only be unwound from the bobbin 102 by applying a minimum tensile force become.
  • a friction disk 108 is arranged under the coil 102 in the housing 100, on which the coil 102 rubs when the coil 102 rotates. The friction disk 108 thus prevents the spool 102 from running when the tensile force decreases, as a result of which the end sections 26 and 30 are always held under tensile stress between the winding core 16 and the first and second connecting means 24, 28.
  • the first end section 26 of a thread-like element wound on the bobbin 102 is penetrated by the radially inner pin 84, which cannot be seen in the illustration in FIG. 11, since the sectional plane in FIG. 11 is perpendicular to the connecting axis between the pins 82 and 84 runs, carried out, for which the pin 84 is designed as an eyelet, see FIG. 1A.
  • FIG 3 shows a top view of the first rotating body 12 and the second rotating body 14 with the covers 90 and 92 removed, the circumferentially distributed arrangement of the boats 80 around the winding core 16. A total of six boats 80 are arranged on the first rotating body 12.
  • the boats 80 can each be tilted back and forth about an axis 108 which is directed radially with respect to the winding core 16 and which is intended to pass through the radially outer pin 82 and the radially inner pin 84.
  • a tilting mechanism 110 For tilting the shuttle 80, a tilting mechanism 110 is provided (not shown in FIGS. 1A and 2) which tilts the shuttle 80 back and forth in a controlled manner by the rotary movement of the rotating bodies 12 and 14.
  • the control of the tilt mechanism 110 is such that each time the first one rotates Rotating body 12 about the winding core 16 by an angle of rotation, which corresponds to an angle of 360 ° divided by the number of first end sections 26 of the thread-like elements, corresponding to the number of boats, in the embodiment shown, about 60 °, alternately tilted back and forth.
  • the tilting mechanism 110 has a first actuating element 112 for each shuttle 80, which is arranged under an end 116 which leads in the direction of rotation according to an arrow 114 of the first rotating body 12.
  • a second actuating element 118 of the tilting mechanism 110 is arranged under a trailing end 120 of each boat 80. The actuating elements 112 and 118 are pressed alternately against the leading end 116 and the trailing end 120 of each boat 80 when the rotating bodies 12 and 14 are rotated.
  • each first actuating element 112 and every second actuating element 118 are designed as balls 122 and 124, respectively, each in a cylindrical bore 126 or 128, which are provided in the first rotating body 12, axially freely movable.
  • each ball 122 or 124 rests on the second rotating body 14 and can roll on the latter during the rotational movement of the rotating bodies 12 and 14.
  • the balls 122 and 124 have a diameter that is smaller than the distance from the upper side of the rotating body 14 to the upper side of the first rotating body 12.
  • the distribution of the balls 122 and balls 124 in the first rotating body 12 is chosen so that the balls 122 on one are arranged radially inner circle, while the balls 124 are arranged in their entirety on a radially outer circle in the first rotating body 12. Furthermore, the balls 122 and 124 are arranged in the first rotating body 12 such that the radially inner balls 122, viewed in the direction of rotation of the arrow 114, are arranged alternately in front of the radially outer balls 124 or behind the radially outer balls 124. The arrangement of the balls 122 and 124 is therefore seen in pairs alternating in the direction of rotation of the arrow 114.
  • the rotating body 14 has circumferentially evenly distributed and circumferentially limited elevations 130.
  • the elevations 130 have the form of platelets 132, which are firmly connected to the second rotating body 14.
  • a total of six such platelets 132 are arranged on the second rotating body 14.
  • Three of the platelets 132 are arranged on a radially outer circle, while three of the platelets 132 are arranged on a radially inner circle.
  • the plates 132 are each arranged approximately centrally between the thread guides 76. 5, the three radially inner plates 134 and the three radially outer plates 132 are arranged alternately.
  • the platelets 132 and 134 also have a run-on slope 136 at their leading end, as seen in the direction of rotation of the second rotary body 14, as can be seen in particular from FIG. 13.
  • FIG. 6 shows a rotational position between the first rotating body 12 and the second rotating body 14, in which the radially inner balls 122 and leading radially outer balls 124 seen in the direction of rotation of the first rotating body 12 according to the arrow 114 pass over the run-up slope 136 onto the Platelets 132 have accumulated.
  • the leading balls 122 and 124 are pressed upwards out of the cylindrical bores 126 and 128 in the first rotating body 112, but remain captively in their recesses 126 and 128 (see FIG. 13). Since the leading balls 122 and 124 are arranged under the respective leading end 116 of each boat 80, the leading ends 116 are correspondingly tilted upward, as shown in FIG. 8 a).
  • FIG. 7 shows an operating position in which the first rotating body 12 and the second rotating body 14 have rotated further by an angle of rotation of approximately 60 ° compared to the operating position in FIG. 6. Due to the alternating arrangement of the balls 122 and 124 are now in the direction of rotation according to the Arrow 114 of the first rotating body 112 seen trailing balls 122 and 124 run onto the platelets 132, so that now the trailing ends 120 of each shuttle 80 are pressed upwards, so that each shuttle 80 is tilted with its leading end 116 downward, as is shown in Fig. 8 b). The second end sections 30 of all the thread-like elements now run over the shuttle 80. This is shown again in FIG. 10 for clarification, the end sections 30 now being shown as solid lines above the shuttle 80.
  • each shuttle 80 is alternately tilted back and forth after a partial rotation of about 60 °, i.e. the leading end 116 of each boat 80 is tilted three times up and three times down during a full revolution of the rotating bodies 12 and 14.
  • the tilting movement of all of the boats 80 takes place synchronously in the same tilting direction (see FIGS. 9 and 10).
  • the first connecting means 24 are prepared in a preparatory work step, for which purpose the first connecting means 24 are removed from the first rotating body 12 when the cover 90 and the cover 92 are removed.
  • a supply length of thread-like element in the case of thin nitinol wire, a length of more than 100 m, which is sufficient for the production of a large number of stents in succession, can already be wound on the coils 102 of each first connecting means 24.
  • the second end portion of each filamentary member is wound on one of the weights 78, which also have a spool.
  • the first end portion 26 of each filamentary element is then connected to a shuttle 80, while the second end portion 30 is connected to a weight 78.
  • the first rotating body 12 and the second rotating body 14 are moved into their upper position shown in FIG. 1A, for which purpose the guide pin 68 is disengaged from the thread of the spindle 66 , after which the arrangement of the first rotating body 12 and the second rotating body 14 can be lifted by hand.
  • the guide pin 68 is then brought back into engagement with the thread of the spindle 66, as a result of which the rotating bodies 12 and 14 are fixed in their upper position.
  • a first boat 80 with its pins 82 and 84 is inserted into the recesses 86 and 88 provided for this purpose in the first rotating body 12.
  • the first end section connected to the shuttle 80 is guided to one of the pins 32 at the upper end of the winding core 16, placed thereon, after which the second end section 30, which is connected to the weight, is placed over a thread guide 76.
  • This process is facilitated if the first rotating body and the second rotating body, as shown in FIG. 3, have a rotational position in relation to one another in which the shuttle 80 is offset from the thread guide 76.
  • a second boat 80 is placed adjacent to the first boat 80 in the direction of arrow 114 on the first rotating body 12, the first end portion 26 of this filamentary element then being in the direction of rotation of the arrow
  • the second end section 30 is in the direction of rotation of the second rotating body 14 according to the arrow
  • the rotating bodies 12 and 14 can be slightly lowered without being rotated, so that the end sections 26 and 30 extend slightly obliquely downwards from the pins 32 run radially outwards.
  • the winding of the stent can be started, for which purpose the crank 58 is rotated in the direction of arrow 62 in FIG. 1B, whereby the first rotating body 12 in the direction of arrow 114 and the second rotating body 14 in the direction of arrow 115 rotate in opposite directions become.
  • the first rotating body 12 and the second rotating body 14 are moved downward relative to the winding core 16.
  • the second end sections 30, which are connected to the second rotating body 14, are also unwound and, accordingly, placed in opposite directions in a second helical system around the winding core 16, so that the first end sections 26 and the second Cross end portions 30 at a plurality of intersection points, as shown in FIG. 2.
  • first end sections 26 are not only crossed with the second end sections 30, but each first end section 26 is placed alternately above and below each second end section 30 due to the tilting mechanism 110 for the boats 80, so that the first end sections 26 and the second End sections 30 are intertwined in the manner of a canvas weave.
  • pins 140 are inserted into the winding core 16 in bores provided for this purpose at the end region of the wound stent. Pins 140 are located just below the lower end of the stent previously wound. A thread is placed over the pins 140 around the previously wound stent and is tightly knotted. The thread is used to fix the previously wound braid.
  • the first and second end sections 26 and 30, which lead away from the winding core 16, can then be cut off with a certain excess length.
  • the winding core 16 is then unscrewed from the rod 64.
  • the lower projecting free ends are each knotted together in pairs on the pins 140.
  • the pins 32 at the upper end of the winding core 16 and the pins 140 can then be pulled out, after which the finished stent can be pulled off the winding core 16.
  • the winding core 16 can then be reinstalled in the device 10 for a new manufacturing process of another stent.
  • the winding core 16 determines the contour of the stent to be produced.
  • a cylindrical stent can be produced with the stent shown in FIGS. 1A and 2.
  • the winding core 16 can also have a radial widening at its upper end, so that such a winding core 16 can be used to produce a stent with a crown which expands radially at the top.
  • the spindle 66 is exchangeable and that further spindles 66 with different thread pitches are kept ready. Due to the different thread pitches, the path length by which the first and the second rotating bodies 12 and 14 can be moved relative to the winding core 16 during a full rotation of the rotating bodies 12 and 14 around the winding core 16 can be set. As a result, the inclination angle ⁇ shown in FIG. 14, at which the intersecting first end sections 26 and second end sections 30 cross in the longitudinal direction of the stent, can be set as desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)

Abstract

Dispositif (10) permettant de fabriquer un stent à partir d'une pluralité d'éléments filiformes, qui comprend un mandrin de bobinage (16), un premier corps rotatif (12) et un second corps rotatif (14). Le premier corps rotatif (12) et le second corps rotatif (14) sont disposés autour du mandrin de bobinage (16) de façon à tourner en sens inverse autour de l'axe longitudinal dudit mandrin (16). Le premier corps rotatif (12) comporte, répartis à sa périphérie, une pluralité de premiers moyens de liaison (24), qui relient une première extrémité (26) des éléments filiformes au premier corps rotatif (12), et le second corps rotatif (14) comporte, répartis à sa périphérie, une pluralité de seconds moyens de liaison (28), qui relient la seconde extrémité (30) des éléments filiformes au second corps rotatif (14). Le mandrin de bobinage (16) et les deux corps rotatifs (12, 14) peuvent se déplacer l'un par rapport aux autres dans la direction longitudinale dudit mandrin (16).
EP99948865A 1998-09-24 1999-09-24 Dispositif permettant de fabriquer un stent Withdrawn EP1115930A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19843822A DE19843822A1 (de) 1998-09-24 1998-09-24 Vorrichtung zum Herstellen eines Stents
DE19843822 1998-09-24
PCT/EP1999/007136 WO2000017434A1 (fr) 1998-09-24 1999-09-24 Dispositif permettant de fabriquer un stent

Publications (1)

Publication Number Publication Date
EP1115930A1 true EP1115930A1 (fr) 2001-07-18

Family

ID=7882102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99948865A Withdrawn EP1115930A1 (fr) 1998-09-24 1999-09-24 Dispositif permettant de fabriquer un stent

Country Status (4)

Country Link
EP (1) EP1115930A1 (fr)
JP (1) JP2002526674A (fr)
DE (1) DE19843822A1 (fr)
WO (1) WO2000017434A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7018401B1 (en) 1999-02-01 2006-03-28 Board Of Regents, The University Of Texas System Woven intravascular devices and methods for making the same and apparatus for delivery of the same
DE20014019U1 (de) * 2000-08-16 2002-01-03 AllStent AG, 42929 Wermelskirchen Stent
DE102006013770A1 (de) * 2006-03-24 2007-09-27 Occlutech Gmbh Occlusionsinstrument und Verfahren zu dessen Herstellung
MX2009004291A (es) 2006-10-22 2009-09-07 Idev Technologies Inc Metodos para asegurar extremos de hebra y los dispositivos resultantes.
DE102007063052B4 (de) * 2007-12-21 2009-11-26 Admedes Schuessler Gmbh Flexibles Rundflechten
US8151682B2 (en) * 2009-01-26 2012-04-10 Boston Scientific Scimed, Inc. Atraumatic stent and method and apparatus for making the same
DE102014115337A1 (de) 2014-10-21 2016-04-21 Nasib Dlaikan-Campos Stent zum Schienen einer Vene und System zum Setzen eines Stents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370959A1 (fr) * 1988-11-23 1990-05-30 Charles Maillefer Tresseuse
GB9002741D0 (en) * 1990-02-07 1990-04-04 Karg Limited Braiding machine
TW353123B (en) * 1993-03-23 1999-02-21 Murata Machinery Ltd Braider a braider having a mandrel support member which is pivotable around a braiding point and linearly movable toward and away from the braiding point
DE4422893B4 (de) * 1994-06-30 2005-08-25 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Rundflechtmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0017434A1 *

Also Published As

Publication number Publication date
WO2000017434A1 (fr) 2000-03-30
DE19843822A1 (de) 2000-03-30
JP2002526674A (ja) 2002-08-20

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