JP4457205B2 - Intravascular foreign body removal catheter - Google Patents

Description

  The present invention relates to an intravascular foreign matter removing catheter for removing intravascular foreign matters such as thrombus (including plaque) in peripheral blood vessels.

As a peripheral blood vessel protection device (protection device) in endovascular treatment (intervention) of peripheral blood vessels, there has heretofore been a multi-branch device for introducing a catheter to which a blood flow blocking balloon is attached (for example, see Patent Document 1). As shown in FIG. 15, a blood flow blocking balloon is attached to the outer periphery in the vicinity of the free end of the main conduit, and the main conduit has independent first and second guide holes therein. The blood flow blocking balloon is expanded or contracted by the pressure of the fluid supplied through the second guide hole, and thrombus or the like in the blood vessel is mainly sucked and removed through the first guide hole with blood.
JP 2005-31654 A

  However, at the distal end of the main conduit of the conventional multi-branch device, a blood flow blocking balloon is attached to a position somewhat downstream (downstream) from the main conduit in order to reliably block blood flow with the blood flow blocking balloon. Has been. In addition, a suction catheter is inserted through a main hole provided in the distal end surface of the main conduit to perform treatment such as thrombus removal. For this reason, a non-aspirable region that cannot be aspirated is generated between the aspiration catheter that performs thrombus aspiration and the blood flow blocking balloon (see FIG. 15). As a result, there has been a problem that thrombus or thrombus that has flowed into the non-aspirable region on the side of the main conduit without entering the main hole accumulates on the blocking surface blocked by the blood flow blocking balloon.

  When the accumulated thrombus in the non-aspirable region flows to the distal side of the peripheral blood vessel due to the contraction of the blood flow blocking balloon, it can be extremely dangerous for the patient. In other words, since blood vessels are subdivided, blood flow is likely to be inhibited even with a relatively fine thrombus, and there is a high possibility of causing a blood flow disorder. In addition to this, since the thickness of the insertion tube and the place where insertion is possible are limited, it is very difficult to treat a blood vessel with a thin treetop. For this reason, the outflow of thrombus or thrombus to the blood vessel downstream from the treatment site due to endovascular treatment is a very dangerous situation, and such a situation is a serious medical problem.

  Then, this invention makes it a subject to provide the catheter for intravascular foreign material removal which can suppress the outflow of the thrombus to the blood vessel downstream from the treatment location.

In order to solve the above problems, the following means (1) to ( 2 ) are adopted.

(1) In other words, the intravascular foreign matter removing catheter of the present invention includes a catheter body 1 and an expansion portion 2 provided at a predetermined distal end distance 2fD from the distal end of the catheter body 1 to expand the outer shape of the catheter. A catheter for removing intravascular foreign matter,
The distal end of the catheter main body is opened by a circular lumen, and a side hole for sucking a foreign substance in a blood vessel is provided in a side surface of the catheter main body and within a section within the distal end distance. It has a suction function on the side,
An umbrella body having a sheet-shaped deployment sheet provided on the outer periphery of the catheter body, and a converging tool for holding the umbrella body in a converged state in which the umbrella body is converged along the outer peripheral side surface of the catheter body. The deployment sheet of the umbrella body is deployed so as to occlude blood flow further outward from the outer peripheral side surface of the catheter body in an open state not restrained by the convergence tool, and in a state restrained by the convergence tool The unfolded sheet 231 is disintegrated until it reaches a convergent state, and the spread sheet 231 has fine pores that are uniformly scattered throughout the sheet so as to allow blood components to pass therethrough and not to pass thrombus or clots. Features.

  (2) Further, in the intravascular foreign matter removing catheter, the side hole is a circular hole smaller than the lumen of the catheter body 1, and a plurality of equilaterally spaced symmetrical positions in the vertical cross section with respect to the extension axis of the catheter body. It is preferable to provide one piece.

The spread sheet 231 is provided with a large number of micropores that allow blood components to pass therethrough and not pass thrombus or thrombus. This fine hole has a very small hole diameter as compared with the side hole 3 for suction.

Incidentally, umbrellalike body 23, provided adjacent to the deflating bag 22, it comprises a sheet-shaped umbrella 23, the umbrellalike body 23, the catheter body 1 on the base end side deflating bag 22 Depending on the expansion and contraction, the blood flow may be expanded so as to be occluded, or the blood flow may be opened along the outer periphery of the catheter main body 1 so as to open the blood flow in a state having a plurality of pleats.

  If this is the case, the intravascular foreign matter P collected from the side surface hole 3 located between the upstream side of the expansion part 2 and the distal end of the catheter body 1 and retained by the expansion part 2 (upstream side). (Plaque or thrombus) can be aspirated.

  By sucking the intravascular foreign matter P from the side hole 3 before the expansion portion 2 contracts, it is possible to prevent or inhibit the accumulated intravascular foreign matter P from flowing into the downstream side of the treatment site.

  The intravascular foreign matter removal catheter of the present invention has the above-described configuration, and can suppress the outflow of foreign matter into the blood vessel downstream from the treatment site.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings illustrating the embodiments.

FIGS. 1 to 5 show catheters for removing intravascular foreign matter of Reference Example 1 of the present invention, and FIGS. 6, 7, and 8 show Reference Example 2 , Reference Example 3 and Reference Example 4 of the present invention, respectively. 1 shows a catheter for removing intravascular foreign matter. 9 to 12 show the intravascular foreign matter removing catheter according to the first embodiment of the present invention, and FIGS. 13 and 14 show the intravascular foreign matter removing catheter according to the second and third embodiments of the present invention, respectively. Show.

  In any of the embodiments, the intravascular foreign matter removing catheter of the present invention includes a catheter main body 1 and an expansion portion 2 that is provided with a predetermined distal end distance 2fD from the distal end of the catheter main body 1 to expand the outer shape of the catheter. It comprises. A suction side surface hole 3 is provided on a side surface of the catheter body 1 in a predetermined section within the distal end distance 2fD.

Furthermore, in the catheters for removing foreign substances in blood vessels of the reference examples 1 to 4 (FIGS. 1 to 8), the expanded portion 2 that expands the outer shape of the catheter is provided in a ring shape along the outer periphery of the catheter body 1, or A flow passage 21 through which gas can circulate, and a swell corresponding to the inflow and outflow of liquid or gas passing through the flow passage 21 provided in an annular shape along the outer periphery of the catheter body 1 and connected to the tip of the flow passage 21. And an inflatable bag 22 that can be shrunk.

In addition, the intravascular foreign matter removing catheters (FIGS. 9 to 14) of Examples 1 to 3 are umbrellas having a deployment sheet 231 in which the expansion portion 2 for expanding the outer shape of the catheter is provided on the outer periphery of the catheter body 1. And a converging tool 24 that holds the umbrella body 23 in the converged state S2 that converges along the outer peripheral side surface of the catheter body 1.

  FIG. 15 shows an example of a main conduit of a conventional multi-branch device for introducing a catheter. In FIG. 15, in the side of the free end of the main conduit, as compared with FIG. 5 to FIG. 7 or FIG. .

(Intravascular foreign matter removal catheter of the present invention)
The intravascular foreign matter removing catheter of the present invention is a catheter for removing foreign matter such as a thrombus (including plaque) in a peripheral blood vessel by suction. It has a function. The intravascular foreign matter removal catheter is a concept including a catheter for percutaneous thrombus removal and a catheter called a clot discharge catheter. Since it has a suction function on the tip and side surfaces, it is particularly suitable for insertion and use from the downstream side of blood flow, but it can also be used by inserting from the upstream side of blood flow. Is possible.

Although the present invention is different from an introduce catheter having a sheath introducer function, the present invention has an introduce function by inserting a dilator into the lumen 11 at the distal end of the catheter body 1. It can also be used as a catheter for removing foreign substances in blood vessels.
( Reference Example 1 )

(Catheter body 1)
The catheter body 1 is a catheter pipe that extends in an annular shape, has a lumen 11 along the extension axis, and is opened by a lumen 11 having a circular tip. A chamfered portion 12 that is chamfered obliquely with respect to the extending direction and the axis vertical plane is provided around the distal end surface. That is, in the chamfered portion 12, the outer shape of the catheter body is reduced in diameter toward the distal end side in the axial direction.

(Expansion part 2)
As shown in FIGS. 2 and 5, the expansion portion 2 is provided with a predetermined distal end distance 2 fD from the distal end of the catheter body 1 to expand the outer shape of the catheter. The predetermined tip distance 2fD is preferably, for example, at least half the diameter of the lumen 11 of the catheter body 1 or, for example, greater than the diameter of the lumen 11.

Specifically, the expansion / contraction bag 22 constituting the distal end side of the expansion portion 2 in the reference example 1 is provided at a rear position at a predetermined distal end distance 2 fD from the catheter body 1. This prevents the inflated / deflated bag 22 in a contracted state from coming into contact with the percutaneous or the like when the catheter is inserted and prevents rupture or laceration. Smooth catheter insertion is possible.

The expansion part 2 of the reference example 1 is provided in a ring shape along the outer periphery of the catheter body 1, and a flow path 21 through which liquid or gas can flow, and the outer periphery of the catheter body 1 connected to the tip of the flow path 21. And an inflatable bag 22 that can be expanded and contracted in response to the inflow and outflow of liquid or gas. The liquid or gas expands or contracts the expansion / contraction bag by flowing into and out of the expansion / contraction bag.

(Flow path 21)
The flow passage 21 is provided in an annular shape along the extending direction of the catheter body 1 in a side sectional view including the shaft, and a liquid or gas can flow therethrough. In the embodiment, in a front cross-sectional view perpendicular to the axis shown in FIG. 4, the flow passage 21 forms a cylindrical flat annular fine gap that is coaxial with the axis of the lumen 11, and around the lumen 11, that is, It is provided along the outer periphery of the catheter body 1. That is, the flow passage 21 forms a double circle in a front sectional view, and the lumen 11 of the catheter body 1 and the flow passage 21 form a so-called coaxial lumen structure.

(Inflatable bag 22)
The expansion / contraction bag 22 is connected to and communicated with the tip of the flow passage 21 and is provided in an annular shape along the outer periphery of the catheter body 1, and itself in response to the inflow / outflow of liquid or gas from the flow passage 21. It can expand and contract. 1 to 3 and 5 show only the expanded state. In a state where there is little or no liquid or gas, the inflatable bag 22 is in a contracted state, the bag surface constituting the inflatable bag 22 is loosened and comes into contact with the outer peripheral surface of the catheter body 1 ( Not shown).

  As shown in FIG. 1, the inflatable bag 22 forms an elliptical sphere having the major axis in the direction of the extension axis of the catheter body 1 in the inflated state. However, in actual use, as shown in FIG. 5, a blood vessel having a central half length or more (preferably, for example, about three quarter length) of the full length in the long axis direction of the inflatable bag 22 in a side sectional view including the shaft. The contact part 22c is along the inner surface of the blood vessel without further expanding the blood vessel while in contact with the blood vessel. This achieves more reliable blood vessel blockage by flexibly responding to the shape of the inner surface of the blood vessel.

  Similarly, in FIG. 5, when the portion from the blood vessel contact portion 22c to the tip of the inflatable bag 22 is a non-contact tip portion 22fnc, the non-contact tip portion 22fnc is a side sectional view including the shaft. For example, it is formed with a larger curvature than an arc having a central angle of 60 degrees. Further, in the expanded state, the axially central portion of the non-contact tip 22fnc forms, for example, a substantially vertical plane with respect to the extension axis, or 15 degrees front and rear with respect to the substantially vertical plane, in order to prevent foreign matter from staying in the blood vessel. It is preferable to form a surface inclined at an angle of within. More specifically, it is preferable to intersect the outer peripheral surface of the category tail body substantially perpendicularly.

(Side hole 3)
A plurality of side holes 3 are provided at equal intervals around the extension axis of the catheter body 1 at symmetrical positions in a vertical cross section with respect to the extension axis. In Reference Example 1 , two symmetric positions are provided at the same position in the axial direction as shown in FIG. 3, and the hole diameter 3D is, for example, approximately one third of the diameter of the lumen 11 of the catheter body 1.

  2 and 5, a predetermined axial distance from the distal end of the catheter body 1 (that is, the remaining length obtained by subtracting the hole diameter 3D from the distal end distance 2fD of the inflatable bag 22) is provided. It is preferable that the distal end of the catheter body 1 is not in contact. Accordingly, the distal end portion of the catheter body 1 to which a particularly large external force is applied can maintain a strength of a predetermined level or more, and is not bent or deformed when the catheter body 1 is inserted. In the embodiment, the non-contact distal end portion 22fnc of the inflating and deflating bag 22 and the proximal end edge of the side surface hole 3 are in contact with each other, whereby the intravascular foreign matter P is more reliably collected.

(Marker 5)
As shown in FIG. 2, the catheter body 1 or the expansion portion 2 is provided with markers 5 that indicate the front and rear of the axial position of the expansion portion 2. The marker 5 is made of a metal such as platinum or tantalum that can be seen under fluoroscopy, and is formed so as to be wound around the catheter body 1. As shown in FIG. 5, the position of the marker 5 is a position where the tip or the rear end is the tip or the rear end of the blood vessel contact portion 22c, respectively, and can be visually recognized in two places, the front and the rear, as shown in FIG. It is provided with a predetermined axial length.

( Reference Example 2)
FIG. 6 shows a use state of a sectional view in the side view direction of the catheter for removing foreign matter in blood vessels (expanded state) of Reference Example 2 of the present invention. The catheter for removing foreign substances in blood vessels of Reference Example 2 is smaller in the expansion diameter of the inflatable bag 22 than in Reference Example 1, and the blood vessel contact portion 22c is an abbreviation of the axial length (long axis) of the inflatable bag 22. The length is one fifth. Further, only one marker 5 is provided at the central position of the axial length (long axis) of the inflatable bag 22 so that the marker 5 is positioned at the front and rear ends of the short blood vessel contact portion 22c. In such a case, the marker 5 can reliably indicate the center in the axial direction of the blood vessel blocking position. Although the non-contact tip portion 22fnc of the inflatable bag is longer in the axial direction than the reference example 1 , the angle with the shaft decreases as the curvature spreads from the center of the shaft to the outer peripheral side, and comes into contact with the blood vessel. In the vicinity, it is assumed that the contact with the inner surface of the blood vessel is made at a fine angle, and the retention of foreign matter P in the blood vessel can be suppressed. Other main configurations are the same as those in Reference Example 1 .

( Reference Example 3)
FIG. 7 shows a use state of a sectional view in the side view direction of the intravascular foreign matter removing catheter (expanded state) of Reference Example 3 of the present invention. In the catheter for removing foreign matter in blood vessel of Reference Example 3 , as compared with Reference Example 1 , the inflated / deflated bag 22 is formed of a substantially cylindrical shape instead of an elliptical sphere. However, as shown in FIG. 7, the front and rear ends are provided with rounded curved boundary so as to suppress rupture, breakage, and laceration of the inflatable bag 22 due to bias of external force or the like. In the present embodiment, the blood vessel contact portion 22c occupies almost the entire area (specifically, for example, 80% or more) of the axial length (long axis) of the inflatable bag 22 for more reliable blood vessel blockage. Is possible. Further, since the curved surface of the non-contact tip portion 22fnc is small and the non-contact tip portion 22fnc is formed from a substantially plane perpendicular to the axis from the axial center to the vicinity of the outer periphery, the intravascular foreign matter P is less likely to stay. Yes. Other main configurations are the same as those in Reference Example 1 .

( Reference Example 4)
FIG. 8 is an explanatory front sectional view of a catheter for removing intravascular foreign matter according to Reference Example 4 of the present invention. This is an axial vertical cross section at a position including the side hole 3 corresponding to the AA position of Reference Example 1 shown in FIG. Three side holes 3 of Reference Example 3 are provided at equal intervals in the same position in the axial direction. The hole diameter 3D is approximately one-eighth of the diameter of the lumen 11 of the catheter body 1 and has a predetermined strength that does not easily deform or collapse. Other main configurations are the same as those in Reference Example 1 .

FIG. 9 shows a convergent state S2 of the intravascular foreign matter removing catheter according to the first embodiment of the present invention as a partial sectional explanatory view of the side view axis. In FIG. 9, only the blood vessel and the converging tool 24 are shown in cross section. Further, FIG. 10 shows a use state following FIG. 9 as a side view axis sectional explanatory view. FIG. 10 shows a state where the converging tool 24 is slid toward the axial base end side and the umbrella body 23 is expanding from the state of FIG. 9. FIG. 11 is a partially sectional explanatory view showing a use state following FIG. 10 in a side view. FIG. 11 shows a state in which the converging tool 24 is further slid toward the proximal end side in the axial direction from the state of FIG. 10 so that the peripheral end of the umbrella body 23 and the developing sheet 231 in the vicinity thereof are in contact with the blood vessel. In this state, S1 is reached. FIG. 12 is a side view axial sectional view of the intravascular foreign matter removing catheter in the open state S1 of FIG.

In the intravascular foreign matter removing catheter of Example 1 , the expansion portion 2 is provided on the outer periphery of the catheter body 1 so that the umbrella body 23 having the deployment sheet 231 and the umbrella body 23 is along the outer peripheral side surface of the catheter body 1. And a converging tool 24 that retains the converged state S2 that has converged.

The deployment sheet 231 of the umbrella body 23 is deployed and tensioned or expanded so as to further block the blood flow from the outer peripheral side surface of the catheter body 1 to the outside in the open state S1 not restrained by the converging tool 24 (see FIG. 11 and FIG. 11). FIG. 12). Moreover, in the state restrained by the converging tool 24, it relaxes and relaxes until it reaches the convergence state S2 (FIG. 9). In addition, the unfolding sheet 231 may be expanded with tension at the time of expansion, or may be contracted with or without relaxation at the time of expansion / relaxation. The spread sheet 231 is provided with a large number of micropores that allow blood components to pass therethrough and not pass thrombus or thrombus. These fine holes have an extremely small hole diameter of 1/10 or less, more preferably 1/50 or less, as compared with the side holes 3 for suction, and are evenly distributed throughout the spread sheet 231. In the above-mentioned catheters for removing foreign substances in blood vessels of Reference Examples 1 to 4, neither the catheter body 1 nor the inflatable bag 22 has such a large number of fine holes.

(Umbrella 23)
Specifically, the umbrella body 23 urges the deployment sheet 231 to be deployed in an umbrella shape with the distal end side of the catheter as an open end and the proximal end side as a fixed end, and to deploy the deployment sheet 231 in the open state S1. The deployment sheet 231 is fixed to the deployment sheet 231, and both the deployment sheet 231 and the deployment bone 232 are fixed so as to be in contact with the outer periphery of the catheter body 1 at the fixing portion.

The developed bone 232 can be made of a shape memory alloy in which the developed state of the umbrella body 23 in the open state S1 is shape-memorized. The developed bone 232 of Example 1 is made of a plurality of shape memory alloys that extend along the axis in parallel with the axis in the converged state S2. In the open state S1, the distance from the shaft increases from the fixed end in contact with the outer peripheral surface of the catheter body 1 to the outer periphery toward the distal end in the axial direction.

(Converging tool 24)
The converging tool 24 is a cylindrical body that is provided around the umbrella body 23 and the catheter body 1 so as to cover the fixing portion of the umbrella body 23, and the umbrella body 23 and the umbrella body 23 are disposed closer to the base end side than the umbrella body 23. As a position where contact is possible, it is slidable in the axial direction. Then, the degree of expansion by opening the umbrella body 23 is adjusted by sliding the convergence tool 24 while keeping the tip of the convergence tool 24 in contact with the umbrella body 23. Here, it is preferable that the fixing portion base end 23r of the umbrella body 23 is located inside the converging tool 24 even in the open state S1 of the umbrella body 23 illustrated in FIGS. 11 and 12.

As shown in FIG. 12, the side surface hole 3 of the first embodiment has a predetermined hole edge proximal end distance 4D from the reference position to the front when the contact position of the umbrella body 23 with the catheter body 1 is set as the reference position. It is preferable to be provided. This hole edge base end distance 4D indicates the axial distance from the base end edge of the side surface hole 3 to the tip of the fixed portion. Specifically, the hole edge base end distance 4 </ b> D is preferably not less than the hole diameter 3 </ b> D of the side hole 3. This is to prevent a narrow-angle region from being formed between the umbrella body 23 and the outer periphery of the catheter body 1, and the intravascular foreign matter P from being sandwiched between them. This is to recover the foreign matter P more efficiently.

Other main structures that are not specified are substantially the same as those in Reference Example 1 .

FIG. 13 shows an open state S1 of the intravascular foreign matter removing catheter according to the second embodiment of the present invention as a partial sectional explanatory view in side view. The developed bones 232 of Example 2 cross each other so as to form a rhombus in the open state S1, and form a mesh of an oblique lattice. Similarly to the first embodiment, the spread sheet 231 according to the second embodiment is provided with a large number of micropores that allow blood components to pass therethrough and do not pass thrombus or thrombus. Other main configurations are the same as those in the first embodiment .

FIG. 14 shows an open state S1 of the intravascular foreign matter removing catheter according to the third embodiment of the present invention as a partial cross-sectional explanatory view. The developed bone 232 according to the third embodiment has a reduced diameter from the first developed bone 232a whose shape is stored in a curved line whose distal end extends to the outer periphery and the proximal end portion connected to the distal end of the first deployed bone 232 in the distal direction. A second developed bone 232b whose shape is stored in the curved line to be made, an annular first deployment auxiliary bone 232c in a state of floating from the catheter body 1 on the distal end side of the second deployed bone 232b, and a first deployed bone It consists of a second deployment assisting bone 232d that is stored in the arcuate curved line on the proximal side while assisting the open state S1 of 232. The unfolding sheet 231 according to the third embodiment covers the first unfolding bone 232a and is fixed to the second unfolding assisting bone 232d. The deployment sheet 231 also has an open edge at the boundary between the first deployment bone 232a and the second deployment bone 232b. Similarly to the first embodiment, the spread sheet 231 of the third embodiment is provided with a large number of micropores that allow blood components to pass therethrough and do not pass thrombus or clots. Other main configurations are the same as those in the first embodiment .

In addition, the present invention is not limited to the reference examples and examples described above, and various modifications can be made without departing from the spirit of the present invention.

It is a perspective explanatory view of the catheter for removing foreign matter in blood vessels of Reference Example 1 of the present invention. It is side view partial axial sectional explanatory drawing of the catheter for the foreign-body foreign material removal of the reference example 1 of this invention. FIG. 3 is a cross-sectional view in the front view direction AA of the intravascular foreign matter removing catheter shown in FIG. 2. FIG. 3 is a front view direction BB cross-sectional view of the intravascular foreign matter removing catheter shown in FIG. 2. It is side view axial sectional explanatory drawing which shows the use condition of the catheter for the foreign-body foreign material removal of the reference example 1 of this invention. It is a sectional view in the side view direction of the catheter for removing intravascular foreign matter of Reference Example 2 of the present invention. It is side surface axial sectional explanatory drawing of the catheter for the foreign-body foreign material removal of the reference example 3 of this invention. It is front view axis | shaft cross-section explanatory drawing of the catheter for the foreign-body foreign material removal of the reference example 4 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view partially illustrating a convergent state of an intravascular foreign matter removing catheter according to a first embodiment of the present invention. It is a side view axial sectional explanatory drawing which shows the use condition of the catheter for intravascular foreign material removal of Example 1 of this invention. It is side view partial cross-section explanatory drawing which shows the open state of the catheter for intravascular foreign material removal of Example 1 of this invention. FIG. 12 is an explanatory side cross-sectional view of the intravascular foreign matter removing catheter according to the first embodiment of the invention shown in FIG. 11. It is side surface partial partial explanatory drawing which shows the open state of the catheter for the intravascular foreign material removal of Example 2 of this invention. It is side surface partial sectional explanatory drawing which shows the open state of the catheter for the foreign-body foreign material removal of Example 3 of this invention. It is side surface axial sectional explanatory drawing of the example of the main conduit | pipe of the conventional multi-branch apparatus for catheter introduction.

DESCRIPTION OF SYMBOLS 1 Catheter main body 11 Inner lumen | bore 12 Chamfer part 2 Expansion part 2fD Tip distance 21 Flow path 22 Expansion / contraction bag 22c Vascular contact part 22fnc Non-contact tip part 23 Umbrella 23r Fixing part base end 231 Deployment sheet 232 Deployment bone 232a First deployment Bone 232b Second deployment bone 232c First deployment auxiliary bone 232d Second deployment bone 24 Converging tool 3 Side hole 3D Hole diameter 4D Hole edge proximal distance (side hole proximal edge to fixed part distal end)
5 Marker S1 Open state S2 Converged state P Foreign body in blood vessel

Claims (2)

A catheter for removing foreign matter in a blood vessel, comprising: a catheter body to be inserted and used from the downstream side of the bloodstream; and an expansion portion provided at a predetermined distal end distance from the distal end of the catheter body and extending the outer shape of the catheter. The distal end of the catheter body is opened by a circular lumen, and a side hole for sucking a foreign body in a blood vessel is provided on a side surface of the catheter body within the distal end distance, and the distal end surface is formed by the lumen and the side hole. And a suction function on the side,
An umbrella body having a sheet-shaped deployment sheet provided on the outer periphery of the catheter body, and a converging tool for holding the umbrella body in a converged state in which the umbrella body is converged along the outer peripheral side surface of the catheter body. The deployment sheet of the umbrella body is deployed so as to occlude blood flow further outward from the outer peripheral side surface of the catheter body in an open state not restrained by the convergence tool, and in a state restrained by the convergence tool The unrolled sheet is loosened until it reaches a converged state, and the spread sheet is provided with fine pores that are uniformly distributed throughout the sheet so as to allow blood components to pass therethrough and not to pass thrombus or clots. A catheter for removing foreign matter in a blood vessel. 2. The intravascular foreign matter removing catheter according to claim 1, wherein the side hole is a circular hole smaller than the lumen of the catheter body, and a plurality of side holes are provided at equal intervals in a symmetric position in a vertical section with respect to the extension axis of the catheter body.

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