KR20230146276A - Delivery device of blood flow restrictor and delivery method of blood flow restrictor using the same - Google Patents

Abstract

The present invention relates to a delivery device configured to enable separation and recovery of a blood flow restriction device using pneumatic and magnetic force, and a delivery method using the same. The delivery device of the blood flow restriction device of the present invention comprises: a delivery tube comprising an internal space to provide a movement path of the blood flow restriction device; an operating unit connected to a first end of the delivery tube and comprising a power source for discharging or sucking fluid into the internal space; and a coupling unit formed at a second end of the delivery tube opposite to the first end and configured to be connectable with a connecting end formed on one side of the blood flow restriction device. The forward and backward movement of the blood flow restriction device disposed in the delivery tube is controlled by a discharge or suction operation of the operating unit.

Description

Delivery device of blood flow restrictor and delivery method of blood flow restrictor using the same}

The present invention relates to a delivery device and delivery method for a blood flow restriction device, and more specifically, to a delivery device configured to enable separation and recovery of a blood flow restriction device using pneumatic and magnetic force, and a delivery method using the same.

The walls of the vascular system, especially arterial walls, can develop areas of pathological expansion known as aneurysms. Aneurysms are thin, weak blood vessel walls that are prone to rupture, caused by disease, injury, or congenital abnormalities. A representative example of such aneurysm is a cranial aneurysm that occurs in the aorta of the brain, and is also found in other parts of the body.

If the weakened wall of an aneurysm ruptures, it can cause death. Aneurysms can usually be treated by removing the weakened portion of the blood vessel from the artery. A typical surgical procedure to remove an aneurysm involves fixing a metal clip around the bottom of the aneurysm, that is, the neck.

In addition, there is a known method of filling or occluding an aneurysm by inserting a thin flexible coil or wire into the aneurysm using a microcatheter. This blood flow restriction device, also known as an embolic coil, fills the sac of an aneurysm and acts to protect the artery wall from blood flow and blood pressure by causing a clot to form.

Recently, blood flow restriction devices of various shapes that can replace embolic coils are being developed. A representative example is the 'Medina Embolization Device', which proposes a blood flow device with a predetermined area and volume to improve the existing shortcomings of the embolization coil.

These various blood flow restricting devices are guided to a predetermined delivery site through a delivery catheter and delivered to the target site within the blood vessel by a delivery device or separation device.

Prior Patent 1 is a system for delivering an embolic coil from a delivery tube to a target area in the patient's body, and discloses a technology for delivering and separating the embolic coil using a compression spring and low-temperature adhesive. The embolic coil and delivery device are fixed with the adhesive force of the adhesive until they approach the target area in the body. After approaching the target area, a remotely operable heating element is activated, and the adhesive is softened by the heating element. It uses the principle that the embolic coil is separated from the delivery device as soon as the tension of the compression spring becomes greater than the adhesive force of the softened adhesive.

Prior Patent 1 can achieve the effect of delivering and separating a blood flow restricting device with a relatively simple structure, but first, it is impossible to recover an incorrectly separated blood flow restricting device, and second, the blood flow restricting device is located close to the target area within the blood vessel. Third, it does not solve problems such as fine gases that may occur when the adhesive is softened by the heating element. Fourth, damage or rupture of blood vessels due to thermal energy due to abnormal heating of the heating element. It has limitations, such as the risk of

1. Korean Patent Registration No. 10-2104226 (Title of invention: Embolization coil detachment device with heating element and kicker)

Accordingly, the present invention is designed with a safer structure to overcome the various limitations of the existing above-described delivery devices, allows for fine adjustment of the blood flow restricting device, and allows for retrieving and repositioning incorrectly placed blood flow restricting devices. The purpose is to develop a delivery device with a structure that can

In addition, the purpose of the present invention is to provide a thermally or chemically safe power source for separating or recovering a blood flow restriction device from a delivery device.

In addition, the purpose of the present invention is to provide a device and method that allows users of the delivery device of the present invention to operate the delivery device more intuitively and to separate and recover the blood flow restriction device in a simple and safe manner. there is.

A delivery device for a blood flow restricting device according to an embodiment of the present invention to solve the above-mentioned problems is a delivery device for delivering a blood flow restricting device to a target area in the body, including an internal space where the blood flow restricting device is moved. a delivery tube providing a path; An operating unit connected to the first end of the delivery tube and including a power source for discharging or suctioning fluid into the internal space; and a coupling portion formed at a second end opposite to the first end of the delivery tube and configured to be coupled to a connection end formed on one side of the blood flow restricting device. It includes, and the forward and backward movement of the blood flow restriction device disposed in the delivery tube is controlled by the discharge or suction operation of the operation unit.

Additionally, in the delivery device of the present invention, the connecting end of the blood flow restricting device may include a magnetic material, and the coupling portion may be configured to couple to the connecting end by magnetic force.

In addition, the delivery device of the present invention includes a push wire configured to be movable within the delivery tube and moving the blood flow restriction device disposed within the delivery tube along the longitudinal direction of the delivery tube; may further include.

Additionally, in the delivery device of the present invention, the power source may be an air pump that suctions or discharges air.

A method of delivering a blood flow restricting device according to an embodiment of the present invention is a method of delivering the blood flow restricting device to a target area in the body using a delivery device of the blood flow restricting device according to an embodiment of the present invention, wherein the blood flow restricting device is delivered to a target area in the body. 1. A method of removing a restrictor device, comprising: positioning the blood flow restrictor device within the delivery tube; increasing the pressure within the delivery tube by causing the manipulation unit to discharge fluid into the inner space of the delivery tube; and maintaining pressure until the blood flow restrictor device moves within the delivery tube and is separated from the delivery tube via the coupling formed at the second end. Includes.

Additionally, in the delivery method of the present invention, in the step of maintaining the pressure, the pressure is maintained at a first pressure during a section in which the blood flow restricting device moves within the delivery tube, and the blood flow restricting device is connected to the coupling portion. The pressure is maintained at a second pressure during the section passing through the coupling portion in close proximity, the first pressure is greater than the frictional force between the blood flow restricting device and the inner wall of the delivery tube, and the second pressure is set to the pressure of the blood flow restricting device. It may be greater than the bonding force between the connection end and the coupling portion.

Additionally, the delivery method of the present invention is a method of retrieving the blood flow restricting device, comprising the steps of: approaching the coupling portion to the blood flow restricting device separated from the delivery tube; lowering the pressure in the delivery tube by causing the manipulation unit to suck fluid from the inner space of the delivery tube when the connection end and the coupling part of the blood flow restricting device come into contact; and maintaining the pressure until the blood flow restricting device moves to a predetermined point within the delivery tube. may include.

The delivery device for the blood flow restriction device of the present invention uses pneumatic (hydraulic) and magnetic force to enable separation and recovery of the blood flow restriction device, thereby solving the problem of thermal or chemical side effects of existing delivery devices on the vascular system. You can.

In addition, according to the delivery device and delivery method of the present invention, it is possible to fine-tune the blood flow restricting device and recover and reposition misplaced blood flow restricting devices, which significantly increases the safety and reliability of procedures using the delivery device of the present invention. You can.

In addition, according to the delivery device and delivery method of the present invention, the user can operate the delivery device more intuitively and has the advantage of being able to separate and recover the blood flow restriction device in a simple and safe manner.

Figure 1 shows a schematic structure of a blood flow restriction device and its delivery device applied to an aneurysm.
Figure 2 is a perspective view showing a delivery device for a blood flow restriction device according to a first embodiment of the present invention.
FIG. 3 is a cross-sectional view sequentially showing the process of separating the blood flow restriction device from the delivery device of FIG. 2.
FIG. 4 is a cross-sectional view sequentially showing the process of recovering the blood flow restriction device from which the delivery device of FIG. 2 is separated.
Figure 5 is a perspective view showing a delivery device for a blood flow restriction device according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view sequentially showing the process of separating the blood flow restriction device from the delivery device of FIG. 5.
FIG. 7 is a cross-sectional view sequentially showing the process of recovering the blood flow restriction device from which the delivery device of FIG. 5 is separated.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Although first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be a second component within the technical spirit of the present invention.

In the following embodiments, terms such as include or have mean that the features or components described in the specification exist, and do not exclude in advance the possibility of adding one or more other features or components.

In the drawings, the sizes of components may be exaggerated or reduced for convenience of explanation. For example, the size and shape of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown.

Like reference numerals refer to like elements throughout the specification.

When a component is said to be “connected” or “connected” to another component, it is understood that it may be directly connected to or connected to that other component, but that other components may also exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Elements or layers are referred to as “on” or “on” another element or layer, not just directly on top of another element or layer, but also between elements or layers. Includes all cases intervening. On the other hand, when a component is referred to as “directly on” or “directly on,” it indicates that there is no intervening other component or layer.

Spatially relative terms such as “below”, “beneath”, “lower”, “above”, “upper”, etc. are used as a single term as shown in the drawing. It can be used to easily describe a component or its correlation with other components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

Hereinafter, a blood flow restriction device according to various embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 shows a schematic structure of a blood flow limiting device 10 and its delivery device 100 applied to an aneurysm A, and Figure 2 shows a delivery device of the blood flow limiting device according to the first embodiment of the present invention. This is a perspective view showing (100).

Referring to Figure 1, an aneurysm (A) occurs when a part of the artery wall becomes thin due to some factor and the blood vessel expands. Figure 1 shows the form of a representative cerebral aneurysm, 'saccular aneurysm'. This aneurysm (A) has the form of a sac where a portion of the blood vessel is swollen, and includes a dome portion at the swollen end and a neck portion that is a point connected to a normal blood vessel.

The blood flow restricting device delivery device 100 is close to the neck of the aneurysm A and discharges the blood flow restricting device 10, and the discharged blood flow restricting device expands to have a predetermined volume to fill the inside of the aneurysm A. Fill it. The blood flow restricting device 10 may be inserted into the aneurysm A and block blood flow to the aneurysm by forming a blood clot within the aneurysm.

Although the blood flow restriction device 10 in FIG. 1 is illustrated as a spherical self-expansion type device, the scope of the present invention is not limited thereto.

The blood flow restricting device 10 may be a blood flow restricting device having a three-dimensional shape such as a cylindrical shape, a heart shape, or a hemisphere in addition to a sphere. In addition, the blood flow restricting device 10 may be an embolic coil, a blood clot forming foam, etc. ), etc. Please note in advance that various blood flow restriction devices that can replace self-expanding blood flow restriction devices can be applied.

The delivery tube of the delivery device 100 may be inserted into the catheter 20 inserted into the vascular system through the skin. Here, the catheter 20 may already be inserted into the desired location, that is, the aneurysm lesion site, and in some cases, the catheter 20 may be moved together with the delivery tube.

Referring to Figure 2, the delivery device 100 of the blood flow limiting device of the present invention includes a delivery tube 110, an operation unit 120, and a coupling unit 130.

The delivery tube 110 is a long micro-conduit containing an internal space and provides a movement path for the blood flow restriction device. The delivery tube 110 may be formed of a material with a substantially cylindrical flexible structure. The delivery tube 110 may be formed to have an inner diameter of approximately 0.5 to 1.0 mm, and may be inserted into the catheter 20 described above or provided to communicate with the catheter 20.

The blood flow restricting device 10 described in FIG. 1 is delivered to the target site through the delivery tube 110 in an non-deployed state, that is, in a folded or compressed form, and when exiting the delivery tube 110, the blood flow restricting device 10 ) is converted to the expanded state.

The manipulation unit 120 is connected to the first end of the delivery tube 110 and includes a power source that discharges or suctions fluid into the internal space of the delivery tube 110. Inclusion here means that a power source may be disposed inside the operation unit 120 and that an external power source may be connected to the operation unit 120.

The forward and backward movement of the blood flow restriction device disposed in the delivery tube 110 is controlled by the fluid discharge or suction operation of the operation unit 120.

Here, the fluid encompasses gas or liquid fluid, and may preferably be air in the form of gas. For example, the power source included in the operating unit 120 may be an air pump that suctions or discharges air. However, the scope of the present invention is not limited to this, and the fluid discharged or sucked in by the power source may be in the form of a liquid such as saline solution, and the power source may be a device that discharges or sucks this liquid fluid.

The manipulation unit 120 may include manipulation buttons 121 and 122 as shown in FIG. 2 .

By manipulating the operation buttons 121 and 122, fluid can be discharged or sucked into the inner space of the delivery tube 110. For example, the operation button 121 shown as '+P' discharges fluid into the internal space of the delivery tube 110 to increase the pressure of the internal space, and the operation button shown as '-p' performs an operation to increase the pressure of the internal space. (122) performs an operation to lower the pressure of the internal space by sucking fluid from the internal space of the delivery tube 110. Of course, these operation buttons 121 and 122 can be designed in any of various shapes.

The coupling portion 130 is a portion that can be coupled to the connection end formed on one side of the blood flow limiting device.

As an example, if the connecting end of the blood flow restricting device includes a magnetic material, the coupling portion 130 may be configured to couple to the connecting end of the blood flow restricting device by magnetic force. For example, the coupling portion 130 may be formed including a magnet or a magnetic material.

The coupling portion 130 is formed at the first end of the delivery tube 110, that is, at the second end opposite to the end to which the manipulation unit 120 is connected. The coupling portion 130 may be formed in a ring shape along the circumference of the end of the delivery tube 110. The coupling portion 130 may be formed to include a magnet or a magnetic material at a portion of the end of the delivery tube 110.

FIG. 3 is a cross-sectional view sequentially showing the process of separating the blood flow limiting device 10 from the delivery device 100 of FIG. 2.

First, the blood flow restricting device 10 is placed within the delivery tube 110 of the delivery device 100. Thereafter, the manipulation unit 120 causes fluid to be discharged into the internal space of the delivery tube 110 (as shown by an arrow) to increase the pressure within the delivery tube 110. Furthermore, the blood flow restriction device 10 moves within the delivery tube 110 and maintains pressure until it is separated from the delivery tube 110 via the coupling portion 130.

3(a) to 3(c) show the discharge operation button (+p, 121), which discharges fluid into the internal space of the delivery tube 110, being activated, and the blood flow restriction device 10 ) is shown in detail as it moves inside the delivery tube 110 and is discharged via the coupling portion 130.

In the step of maintaining the internal pressure of the delivery tube 110, the applied pressure may be subdivided.

A section in which the blood flow restricting device 10 is placed within the delivery tube 110 of the delivery device 100, and the blood flow restricting device 10 moves within the delivery tube 110 as shown in (a) of FIG. 3. During this time, the pressure discharging the fluid may be maintained at the first pressure. At this time, the first pressure is preferably greater than the frictional force between the blood flow restriction device 10 and the inner wall of the delivery tube 110.

Thereafter, as shown in (b) of FIG. 3, the blood flow restricting device 10 approaches the coupling portion 130 and during the section passing through the coupling portion 130, the pressure discharging the fluid may be maintained at the second pressure. At this time, the second pressure is preferably greater than the coupling force between the connection end of the blood flow limiting device 10 and the coupling portion 130.

As described above, since the coupling portion 130 is configured to be coupled to the connection end of the blood flow restricting device 10 by magnetic force, the second pressure must have a force greater than the magnetic force between the connection end and the coupling portion 130, as shown in FIG. 3 As shown in (c), the blood flow restricting device 10 can be completely separated from the delivery tube 110.

FIG. 4 is a cross-sectional view sequentially showing the process of recovering the blood flow restriction device 10 from which the delivery device 100 of FIG. 2 is separated.

If the blood flow restricting device 10 is incorrectly placed in a non-target area, it is necessary to retrieve the blood flow restricting device 10 back into the delivery tube 110, and FIG. 4 sequentially shows this process.

First, as shown in (a) of FIG. 4, the coupling portion 130 is brought close to the blood flow restriction device 10 separated from the delivery tube 110. Since the coupling portion 130 is configured to be coupled to the connection end of the blood flow restricting device 10 by magnetic force, when the coupling portion 130 approaches the blood flow restricting device 10 at a predetermined distance (see Figure 4). As shown in b), the blood flow restricting device 10 comes into contact with the coupling portion 130 due to the attractive force generated between the blood flow restricting device 10 and the coupling portion 130.

It is preferable not to activate the operation button on the operation unit 120 in the section where the action of magnetic force occurs between the blood flow restricting device 10 and the coupling unit 130.

After the connection end of the blood flow limiting device 10 and the coupling portion 130 come into contact as shown in (b) of FIG. 4, the operation button 122 of the operation unit 120 is pressed as shown in (c) of FIG. 4. ) to suction fluid from the inner space of the delivery tube 110 (shown by an arrow). At this time, the pressure within the delivery tube 110 is lowered, and the blood flow limiting device 10 enters the delivery tube 110 via the coupling portion 130. The pressure is maintained until the blood flow restricting device 10 moves to a predetermined point within the delivery tube 110.

When all of the recovery steps shown in FIG. 4 are performed, the delivery device 100 is moved to a predetermined target site again, and then the separation step of the blood flow restricting device 10 shown in FIG. 3 is performed.

Figure 5 is a perspective view showing a delivery device 200 of a blood flow restriction device according to a second embodiment of the present invention.

Referring to Figure 5, the delivery device 200 of the blood flow limiting device of the present invention includes a delivery tube 210, a manipulation unit 220, a coupling unit 230, and a push wire 240.

The delivery tube 210, the manipulation unit 220, and the coupling unit 230 correspond to the configuration of the delivery tube 110, the manipulation unit 120, and the coupling unit 130 described in the delivery device 100 of FIG. 2. Hereinafter, a detailed description of the corresponding configuration will be omitted, and the different configuration will be described.

Delivery device 200 includes a push wire 240 . The push wire 240 is configured to be movable within the delivery tube 110 and moves the blood flow restricting device 10 disposed within the delivery tube 110 . The push wire 240 may perform a function corresponding to the fluid discharge function in the delivery device 100 shown in FIG. 2. That is, the blood flow limiting device 10 performs a function of moving within the delivery tube 110 toward the outside of the delivery tube 110 .

The push wire 240 is a wire having an outer diameter smaller than the inner diameter of the delivery tube 110, and pushes the blood flow restricting device 10 within the delivery tube 110 to extend the length of the delivery tube 110. It can be moved depending on the direction.

As shown in FIG. 5, the push wire 240 may have a modified shape so that the end has a diameter slightly larger than the wire diameter, and may optionally include a marker at the end of the push wire 240.

FIG. 6 is a cross-sectional view sequentially showing the process of separating the blood flow limiting device 10 from the delivery device 200 of FIG. 5.

First, the blood flow restricting device 10 is placed within the delivery tube 210 of the delivery device 200. Thereafter, the push wire 240 pushes the blood flow restricting device 10 to move the blood flow restricting device 10 along the longitudinal direction of the delivery tube 110. The blood flow restrictor device 10 moves within the delivery tube 210 and maintains this motion until it is separated from the delivery tube 210 via the coupling portion 230.

6(a) to 6(c) detail the process in which the blood flow restricting device 10 moves inside the delivery tube 210 by the push wire 240 and is discharged via the coupling portion 230. It is showing. At this time, it is preferable that the operation button 221 of the operation unit 220 is not activated.

FIG. 7 is a cross-sectional view sequentially showing the process of recovering the blood flow restriction device 10 from which the delivery device 200 of FIG. 5 is separated.

If the blood flow restricting device 10 is incorrectly placed in a non-target area, it is necessary to retrieve the blood flow restricting device 10 back into the delivery tube 210, and FIG. 7 sequentially shows this process.

First, as shown in (a) of FIG. 7, the coupling portion 230 is brought close to the blood flow restriction device 10 separated from the delivery tube 210. When the coupling portion 230 approaches the blood flow restricting device 10 at a predetermined distance, blood flow occurs due to the attractive force that occurs between the blood flow restricting device 10 and the coupling portion 230, as shown in (b) of FIG. The limiting device 10 abuts the coupling portion 230 .

It is preferable not to activate the operation button 221 of the operation unit 220 in the section where the action of magnetic force occurs between the blood flow limiting device 10 and the coupling portion 230.

After the connection end of the blood flow restricting device 10 and the coupling portion 130 come into contact, as shown in (c) of FIG. 7, the operation button 221 of the operation unit 220 is activated to control the delivery tube 210. Allow fluid to be aspirated from the internal space (as shown by the arrow). At this time, the pressure within the delivery tube 210 is lowered, and the blood flow limiting device 10 enters the delivery tube 210 via the coupling portion 230. The pressure is maintained until the blood flow restricting device 10 moves to a predetermined point within the delivery tube 210.

When all of the recovery steps shown in FIG. 7 are performed, the delivery device 200 is moved to a predetermined target site again, and then the separation step of the blood flow restricting device 10 shown in FIG. 6 is performed.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

A … aneurism
10 … blood flow restriction device
20 … catheter
100 … delivery device
110 … delivery tube
120 … control panel
121, 122 … operation button
130 … joint
200 … delivery device
210 … delivery tube
220 … control panel
221 … operation button
230 … magnetic force
240 … push wire

Claims (7)

A delivery device for delivering a blood flow restriction device to a target area in the body, comprising:
a delivery tube containing an internal space and providing a path for movement of the blood flow restricting device;
An operating unit connected to the first end of the delivery tube and including a power source for discharging or suctioning fluid into the internal space; and
a coupling portion formed at a second end opposite to the first end of the delivery tube and configured to be coupled to a connection end formed on one side of the blood flow restricting device; Including,
A delivery device for a blood flow restriction device, wherein the forward and backward movement of the blood flow restriction device disposed in the delivery tube is controlled by an discharge or suction operation of the operation unit. According to claim 1,
The connecting end of the blood flow restricting device includes a magnetic material,
The delivery device of a blood flow restriction device, wherein the coupling portion is configured to be coupled to the connecting end by magnetic force. According to claim 1,
a push wire configured to be movable within the delivery tube and moving the blood flow restriction device disposed within the delivery tube along the longitudinal direction of the delivery tube; A delivery device for a blood flow restriction device, further comprising: According to claim 1,
A delivery device for a blood flow restriction device, wherein the power source is an air pump for sucking or expelling air. In a method of delivering a blood flow restricting device to a target area in the body using a delivery device,
A method of disconnecting the blood flow restricting device, comprising:
positioning the blood flow restricting device within a delivery tube;
increasing the pressure within the delivery tube by causing the manipulation unit to discharge fluid into the internal space of the delivery tube; and
maintaining pressure until the blood flow restriction device moves within the delivery tube and is separated from the delivery tube via a coupling formed at one end; A method of delivering a blood flow restricting device, comprising: According to clause 5,
In the step of maintaining the pressure,
Maintaining the pressure at a first pressure while the blood flow restricting device moves within the delivery tube,
Maintaining the pressure at a second pressure while the blood flow restricting device is close to the coupling portion and passes through the coupling portion,
The first pressure is greater than a frictional force between the blood flow restricting device and the inner wall of the delivery tube, and the second pressure is greater than a coupling force between the connecting end of the blood flow restricting device and the coupling portion. In a method of delivering a blood flow restricting device to a target area in the body using a delivery device,
A method of recovering the blood flow restricting device, comprising:
approximating the coupling portion to the blood flow restricting device separate from the delivery tube;
When the connection end of the blood flow restricting device and the coupling part come into contact, lowering the pressure in the delivery tube by causing the manipulation part to suck fluid from the inner space of the delivery tube; and
maintaining pressure until the blood flow restricting device moves to a predetermined point within the delivery tube; Including,
The method of delivering a blood flow restricting device, wherein the coupling portion is configured to couple with the connection end of the blood flow restricting device by magnetic force.

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