KR101685325B1 - Magnetic pulley apparatus to deploy the self-expandable stent - Google Patents

Magnetic pulley apparatus to deploy the self-expandable stent Download PDF

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KR101685325B1
KR101685325B1 KR1020160017018A KR20160017018A KR101685325B1 KR 101685325 B1 KR101685325 B1 KR 101685325B1 KR 1020160017018 A KR1020160017018 A KR 1020160017018A KR 20160017018 A KR20160017018 A KR 20160017018A KR 101685325 B1 KR101685325 B1 KR 101685325B1
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South Korea
Prior art keywords
stent
magnet
pulley
magnetic field
moving
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KR1020160017018A
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Korean (ko)
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이원서
남재광
장건희
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한양대학교 산학협력단
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
    • 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
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • 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
    • A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
    • A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
    • A61F2002/9522—

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

Disclosed is a magnetic pulley device for mounting a stent. The magnetic pulley device comprises: a body formed to have long length in one direction, wherein a stent is inserted to the body; a stent cover which surrounds the body region to which the stent is inserted; and a stent cover moving part which includes a magnet rotatable by an external magnetic field, and moving the stent cover relative to the stent in the longitudinal direction of the body by using the rotation force of the magnet.

Description

[0001] Magnetic pulley apparatus for deploying a self-expandable stent [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic pulley device for mounting a stent, and more particularly, to a magnetic pulley device inserted into a human body to deploy a stent.

A self-expandable stent is used for the improvement of the stenosis or occlusion in the living body such as blood vessels, bile ducts, organs, esophagus, and urethra. The self-expanding stent is formed in a cylindrical shape as a whole by a metal wire or the like, and is expandable in a living body tube.

The basic approach to the delivery of a self-expanding stent typically involves pushing the stent in a distal direction through a sleeve or microcatheter until the stent emerges from the distal end of the sleeve or microcatheter at the desired location within the vasculature of the patient, Thereby advancing the stent through the sleeve or microcatheter.

The conventional method of delivering the stent was to insert the catheter into the human body and position it as a stenosed lesion, and then the operator manually manipulated the catheter to deploy the stent. However, there is a disadvantage that it is difficult to precisely maintain the position of the catheter tip while the practitioner applies a momentary large force to the catheter with both hands to deploy the stent.

Japanese Laid-Open Patent Application No. 2015-19937

The present invention provides a magnetic pulley device for mounting a stent capable of expanding a stent wirelessly using an external magnetic field.

The present invention also provides a magnetic pulley device for mounting a stent capable of precisely controlling the deployment of a stent by controlling an external magnetic field.

A magnetic pulley device for mounting a stent according to the present invention is provided with a long length in one direction, and a body into which the stent is inserted; A stent lid surrounding the body region into which the stent is inserted; And a stent lid moving part including a magnet rotatable by an external magnetic field and moving the stent cover relative to the stent in a longitudinal direction of the body using a rotating force of the magnet.

In addition, the rotation axis of the magnet may be disposed perpendicular to the longitudinal direction of the body.

The magnet may include N and S poles each having a semicircular cross section, and the N poles and the S poles may be symmetrically connected to each other to have a cylindrical shape.

The stent cover moving unit may include a moving pulley coupled to the stent cover, A stationary pulley coupled to the magnet; And a wire connecting the moving pulley and the fixed pulley and wound around the fixed pulley in accordance with the rotation of the magnet.

Further, the fixed pulley is a rotation center coinciding with the rotation axis of the magnet; And an outer circumferential surface having a predetermined radius from the center of rotation, and the wire may be wound along the outer circumferential surface.

According to the present invention, the stent can be deployed wirelessly by controlling the magnetic pulley device inserted inside the human body through an external magnetic field outside the human body.

Further, according to the present invention, it is possible to precisely control the deployment of the stent by driving the magnetic pulley device by controlling the external magnetic field, not by the manual operation of the practitioner.

1 is a perspective view illustrating a magnetic pulley device for stent mounting according to an embodiment of the present invention.
Fig. 2 is a front view showing the magnetic pulley device of Fig. 1;
3 is a cross-sectional view of the magnetic pulley device of FIG.
4 is a view schematically showing a magnetic pulley device and a magnetic field generating system.
5 is a diagram showing a principle of generating a rotating magnetic field of a magnetic field generating system.
6 is a diagrammatic representation of a magnetic field rotating in an arbitrary direction.
7 is a view showing rotation of the magnet according to application of a rotating magnetic field.
FIGS. 8 and 9 sequentially illustrate the process of developing the stent by the magnetic pulley device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Further, in the drawings, the thicknesses of the films and regions are exaggerated for an effective explanation of the technical content.

Also, while the terms first, second, third, etc. in the various embodiments of the present disclosure are used to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. Thus, what is referred to as a first component in any one embodiment may be referred to as a second component in another embodiment. Each embodiment described and exemplified herein also includes its complementary embodiment. Also, in this specification, 'and / or' are used to include at least one of the front and rear components.

The singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprises "or" having "are intended to specify the presence of stated features, integers, Should not be understood to exclude the presence or addition of one or more other elements, elements, or combinations thereof. Also, in this specification, the term "connection " is used to include both indirectly connecting and directly connecting a plurality of components.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a perspective view of a magnetic pulley device for mounting a stent according to an embodiment of the present invention, FIG. 2 is a front view of the magnetic pulley device of FIG. 1, and FIG. 3 is a cross-sectional view of the magnetic pulley device of FIG. 1 .

Referring to FIGS. 1 to 3, a magnetic pulley device 100 is mounted on a catheter, inserted into a human body, and deploys a stent 200. The magnetic pulley device 100 can be deployed in a body cavity (pleural cavity, abdominal cavity), a coronary organs (organs, esophagus, stomach, intestines, bladder, ureters,

The stent 200 is deployed by the magnetic pulley device 100 in the human organ with the passage narrowed or obstructed to secure the passage. The stent 200 is provided in a self-expandable type with a nettube device.

The magnetic pulley device 100 includes a body 110, a stent cover 120, and a stent cover moving part 130.

The body 110 has a long rod shape in one direction and can be mounted on the catheter. The stent 200 is inserted into the front end of the body 110.

The stent lid 120 is inserted into the front end of the body 110 in the form of a tube having a predetermined length to wrap the stent 200. The length of the stent lid 120 may be equal to or longer than the length of the stent 200. Thereby, the stent lid 120 can completely cover the stent 200.

The stent lid moving part 130 moves the stent lid 120 in the longitudinal direction of the body 110. The stent 200 is exposed to the outside by the movement of the stent cover 120, and the exposed area of the stent 200 is self-expanded.

The stent cover moving part 130 includes a magnet 131, fixed pulleys 135 and 136, a moving pulley 141, and a wire 145.

The magnet 131 is positioned in the insertion portion 111 formed at the rear end of the body 110. The magnet 131 is rotatable by an externally applied rotating magnetic field. According to the embodiment, the magnet 131 has a cylindrical shape, and the rotation axis is disposed perpendicular to the longitudinal direction of the body 110. The magnet 131 is provided by a combination of the N pole 132 and the S pole 133. Each of the N pole 132 and the S pole 133 has a semicircular cross section, and has a cylindrical shape coupled to be symmetrical to each other.

FIG. 4 is a view showing a magnetic pulley device and a magnetic field generating system in a simplified manner, FIG. 5 is a view showing a principle of generating a rotating magnetic field of a magnetic field generating system, FIG. 6 is a diagrammatic representation of a magnetic field rotating in an arbitrary direction And FIG. 7 is a view showing the rotation of the magnet according to application of a rotating magnetic field.

4, a rotating magnetic field is applied to the magnetic field generating system 300 located outside the human body H in a state where the magnetic pulley apparatus 100 is inserted into the human body H. The magnetic field generation system 300 includes a coil system for generating a magnetic field in an electromagnetic manner and a permanent magnet system for generating a magnetic field through the mechanical movement of the permanent magnet.

FIG. 5 shows a principle of magnetic field generation according to a coil system. The coil system has a cylindrical structure such as a magnetic resonance imaging (MRI) system, and the human body is located axially in a cylindrical interior, that is, a workspace.

The coil system can control the magnetic field generated in the central region where the human body is located by controlling the current applied to the coils constituting each pair (HC, USCy, USCz), and the magnet can be driven through the magnetic field control.

In the case of a coil system, the three coil pairs can generate a magnetic field in a direction orthogonal to one another in the work space, which means that a magnetic field in a three-dimensional random direction can be generated in the work space. Therefore, a rotating magnetic field can be generated by controlling the current applied to each of the coils, which can be expressed by the following equation.

Figure 112016014565013-pat00001
Equation (1)

Figure 112016014565013-pat00002
Equation (2)

Equation (1) is a formula representing the relationship of the magnetic field with the current, number of turns, and axial radius of each coil, and Equation (2) is a mathematical expression of a magnetic field rotating in an arbitrary direction as shown in FIG. Therefore, the axis of the desired rotating magnetic field

Figure 112016014565013-pat00003
), The x, y, and z components of the magnetic field can be obtained from Equation (2), and the magnitude of the current to be applied to each coil can be determined through Equation (1).

7, the rotating magnetic field generated in the magnetic field generating system 300 may be applied to the magnet 131 to rotate the magnet 131. [

Referring again to FIGS. 1 to 3, the fixed pulleys 135 and 136 are fixedly coupled to both ends of the magnet 131, and rotate together with the magnet 131. The fixed pulleys 135 and 136 have a rotation center C coinciding with the rotation axis of the magnet 131 and have an outer peripheral surface 135a having a predetermined radius r at the rotation center C. [ A wire 145 to be described later is wound around the outer circumferential surface 135a. The fixed pulleys 135 and 136 convert the magnetic torque generated in the magnets 131 into a pulling force. The ratio at which the magnetic torque is converted into the pulling force is determined by the radius r of the outer peripheral surface 135a of the fixed pulley 135. [

The moving pulley 141 is inserted into the body 110 and is provided to be movable along the body 110. The moving pulley 141 is fixedly coupled to the rear end of the stent lid 120.

The wire 145 connects the fixed pulleys 135 and 136 and the moving pulley 141 and transfers the pulling force from the fixed pulleys 135 and 136 to the moving pulley 141. [ The wire 145 is made of an inelastic material. According to the embodiment, the wire 145 may be provided from a polyurethane material. Since this material is not pulled in the process of transmitting the force, the pulling force can be transmitted to the moving pulley 141 without loss.

The wire 145 is provided by repeating the interval between the fixed pulleys 135 and 136 and the moving pulley 141 several times. According to the embodiment, the wire 145 is provided by repeating the interval between the fixed pulleys 135, 136 and the moving pulley 141 four times. Specifically, the wire 145 is fixed to the fixed pulley 135 at one end and is provided to the moving pulley 141 from the fixed pulley 135. The wire 145 is then returned to the moving pulley 141 via the connecting hole 112 formed in the body 110, . And then to the fixed pulley 136 side, and the other end is fixed to the fixed pulley 136. [ The connection of such a wire 145 amplifies the pulling force of the moving pulley 141. According to the embodiment, the amplification ratio of the pulling force is 2.

FIGS. 8 and 9 sequentially illustrate the process of developing the stent by the magnetic pulley device.

Referring to FIG. 8, the magnetic pulley device 100 is inserted into the human body in a state in which the stent 200 is completely closed by the stent cover 120.

When a rotating magnetic field is applied from the outside, a magnetic torque is generated in the magnet 131 as shown in Fig. 9, and the magnetic torque is converted into a pulling force by the fixed pulley 135. The pulling force is transmitted to the moving pulley 141 via the wire 145 and the moving pulley 141 moves toward the magnet 131 together with the stent cover 120 to expose the stent 200. [ The exposed area of the stent 200 is deployed by self-expansion.

The magnetic torque of the magnet 131 received from the external magnetic field can be expressed by the following equation (3).

Figure 112016014565013-pat00004
Equation (3)

Here, T is the magnetic torque applied to the magnet 131 by the external magnetic field, m is the magnetic moment of the magnet 131, and B is the magnetic flux density of the external magnetic field.

From equation (3), the external rotating magnetic field can be expressed by the following equation (4).

Figure 112016014565013-pat00005
Equation (4)

Where Bo is the intensity of the external rotating magnetic field, f is the frequency of the external rotating magnetic field, and t is the time.

The magnetic torque acting on the magnet 131 can be obtained by substituting the equation (4) into the equation (3), and the pulling force generated by the magnetic torque can be expressed as follows.

Figure 112016014565013-pat00006

Where alpha is the amplification ratio by which the pulling force is amplified by the moving pulley 141, and r is the radius of the fixed pulley 135 axis.

The amplification ratio becomes smaller than the ideal case 2 due to the friction generated between the wire 145 and the moving pulley 141 and the amplified pulling force is smaller than the frictional force generated between the stent lid 120 and the stent 200 The stent cover 120 overcomes the frictional force and is pulled for deployment of the stent 200. [ Therefore, when the frictional force generated between the stent cover 120 and the stent 200 is measured, the magnitude of the external rotating magnetic field required for deployment of the stent 200 can be obtained as follows.

Figure 112016014565013-pat00007
Equation (5)

Here, F friction is the frictional force generated between the stent cover 120 and the stent 200.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

100: Magnetic pulley device
110: torso
120: stent cover
130: stent cover moving part
131: magnet
135, 136: Fixed pulley
141: Moving pulley
145: wire
200: stent
300: magnetic field generation system

Claims (5)

A magnetic pulley device for mounting a stent,
A body provided with a length longer in one direction, into which the stent is inserted;
A stent lid surrounding the body region into which the stent is inserted; And
And a stent lid moving unit including a magnet rotatable by an external magnetic field and moving the stent cover relative to the stent in the longitudinal direction of the body using the rotating force of the magnet. The method according to claim 1,
Wherein the rotation axis of the magnet is disposed perpendicular to the longitudinal direction of the body. 3. The method of claim 2,
The magnet
Each of which has an N pole and an S pole having a semicircular shape in cross section,
Wherein the N pole and the S pole are symmetrically coupled to each other so as to have a cylindrical shape. 4. The method according to any one of claims 1 to 3,
The stent cover moving part
A moving pulley coupled to the stent cover;
A stationary pulley coupled to the magnet;
And a wire connected to the moving pulley and the fixed pulley and wound on the fixed pulley in accordance with rotation of the magnet. 5. The method of claim 4,
The fixed pulley
A rotation center coinciding with a rotation axis of the magnet; And
And an outer peripheral surface having a predetermined radius from the center of rotation,
Wherein the wire is wound along the outer circumferential surface.
KR1020160017018A 2016-02-15 2016-02-15 Magnetic pulley apparatus to deploy the self-expandable stent KR101685325B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10441449B1 (en) 2018-05-30 2019-10-15 Vesper Medical, Inc. Rotary handle stent delivery system and method
US10449073B1 (en) 2018-09-18 2019-10-22 Vesper Medical, Inc. Rotary handle stent delivery system and method
KR102042938B1 (en) * 2018-12-31 2019-11-11 한양대학교 산학협력단 Tubular cleaning apparatus and method of using the same
US11219541B2 (en) 2020-05-21 2022-01-11 Vesper Medical, Inc. Wheel lock for thumbwheel actuated device

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JP2008501442A (en) * 2004-06-04 2008-01-24 エドワーズ　ライフサイエンシーズ　コーポレイション Stent delivery system
US20090234279A1 (en) * 2008-03-14 2009-09-17 Goldstein James A Mechanical propulsion catheter apparatus and methods
JP2013146497A (en) * 2012-01-23 2013-08-01 Kaneka Corp Controller and catheter kit
JP2015019937A (en) 2013-07-22 2015-02-02 テルモ株式会社 Stent delivery system
JP2016034594A (en) * 2015-12-17 2016-03-17 株式会社カネカ Controller, catheter kit, and method for using the controller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008501442A (en) * 2004-06-04 2008-01-24 エドワーズ　ライフサイエンシーズ　コーポレイション Stent delivery system
US20090234279A1 (en) * 2008-03-14 2009-09-17 Goldstein James A Mechanical propulsion catheter apparatus and methods
JP2013146497A (en) * 2012-01-23 2013-08-01 Kaneka Corp Controller and catheter kit
JP2015019937A (en) 2013-07-22 2015-02-02 テルモ株式会社 Stent delivery system
JP2016034594A (en) * 2015-12-17 2016-03-17 株式会社カネカ Controller, catheter kit, and method for using the controller

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10441449B1 (en) 2018-05-30 2019-10-15 Vesper Medical, Inc. Rotary handle stent delivery system and method
US10987239B2 (en) 2018-05-30 2021-04-27 Vesper Medical, Inc. Rotary handle stent delivery system and method
US11234848B2 (en) 2018-05-30 2022-02-01 Vesper Medical, Inc. Rotary handle stent delivery system and method
US10449073B1 (en) 2018-09-18 2019-10-22 Vesper Medical, Inc. Rotary handle stent delivery system and method
US10736762B2 (en) 2018-09-18 2020-08-11 Vesper Medical, Inc. Rotary handle stent delivery system and method
US10993825B2 (en) 2018-09-18 2021-05-04 Vesper Medical, Inc. Rotary handle stent delivery system and method
US11160676B2 (en) 2018-09-18 2021-11-02 Vesper Medical, Inc. Rotary handle stent delivery system and method
US11419744B2 (en) 2018-09-18 2022-08-23 Vesper Medical, Inc. Rotary sheath withdrawal system and method
KR102042938B1 (en) * 2018-12-31 2019-11-11 한양대학교 산학협력단 Tubular cleaning apparatus and method of using the same
US11219541B2 (en) 2020-05-21 2022-01-11 Vesper Medical, Inc. Wheel lock for thumbwheel actuated device
US11491037B2 (en) 2020-05-21 2022-11-08 Vesper Medical, Inc. Wheel lock for thumbwheel actuated device

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