WO2014162492A1

WO2014162492A1 - Catheter for image diagnosis

Info

Publication number: WO2014162492A1
Application number: PCT/JP2013/060005
Authority: WO
Inventors: 圭一郎山本
Original assignee: テルモ株式会社
Priority date: 2013-04-01
Filing date: 2013-04-01
Publication date: 2014-10-09
Also published as: JPWO2014162492A1

Abstract

[Problem] To provide a catheter for image diagnosis which is capable of better performing a function of obtaining an image with excellent visibility by reducing excess pressure that is applied during priming. [Solution] A catheter for image diagnosis (100) comprises: a drive shaft (102) which is provided with an inspection wave transmission/reception part (101) on a distal end thereof and which includes a signal path (102a) that is connected to the inspection wave transmission/reception part; a sheath (103) in which the drive shaft is contained and which is inserted into the body; an infusion part (124) which is provided on a member (120) that is provided on a base end side of the sheath and is disposed outside the body and which communicates with the inside of the sheath to inject a liquid; and a relief valve (129) which is provided on a communication part (128) that is formed on the member disposed outside the body and communicates with the inside of the sheath, wherein the relief valve reduces excess pressure that accompanies the injection of liquid into the sheath from the infusion part, though the communication part.

Description

Diagnostic imaging catheter

The present invention relates to a diagnostic imaging catheter.

For example, Patent Document 1 discloses a catheter for image diagnosis such as a catheter that obtains an image by intravascular ultrasound (Intra Vascular Ultra Sound: IVUS) and a catheter that obtains an image by optical coherence tomography (OCT). As disclosed, a drive shaft provided with a test wave transmission / reception unit for transmitting / receiving a test wave such as an ultrasonic wave at a distal end thereof is housed in a sheath inserted into the body.

The inspection wave is emitted from the inspection wave transmission / reception unit into the body, and the reflected wave from the body is received by the inspection wave transmission / reception unit. The inspection wave transmitting / receiving unit emits an inspection wave into the body based on a signal transmitted from a signal path provided in the drive shaft. When the test wave transmission / reception unit receives the reflected wave, a signal corresponding to the reflected wave is transmitted to another device connected to the diagnostic imaging catheter through a signal path provided in the drive shaft.

When gas is present between the sheath and the test wave transmission / reception unit, emission of the test wave from the test wave transmission / reception unit to the body and reception of the reflected wave are hindered by the gas. Therefore, gas is excluded from the inside of the sheath by performing priming for filling the sheath with a liquid such as physiological saline. Such a liquid is press-fitted from the proximal end side toward the distal end side using a syringe through a port communicating with the inside of the sheath provided on the proximal end side of the diagnostic imaging catheter.

JP 2011-72680 A

At this time, if the excessive pressure is suppressed by injecting the liquid, the extension of the drive shaft, in particular, the extension / breakage of the signal path provided in the inside thereof is suppressed, and the function of the diagnostic imaging catheter is exhibited well. The present inventors have found that.

Further, if excessive pressure is suppressed by injecting the liquid, the backflow of the liquid to the proximal end side of the diagnostic imaging catheter can be suppressed. As a result, the drive shaft is connected to the proximal end side of the diagnostic imaging catheter. Leakage of liquid to the driving device to be driven is prevented. For this reason, the drive device operates favorably, and the function of the diagnostic imaging catheter is thereby satisfactorily exhibited.

Furthermore, if the excessive pressure caused by the liquid injection is suppressed, the liquid to be injected and the gas in the sheath are smoothly exchanged, so that bubbles hardly remain in the sheath, and thus an image with excellent visibility can be obtained. can get.

The present invention has been made based on the knowledge obtained by the present inventors, and provides an imaging diagnostic catheter that solves the above-described problems by reducing excessive pressure applied during priming. With the goal.

In order to achieve the above object, a diagnostic imaging catheter according to the present invention is provided with a test shaft transmission / reception unit at a distal end and a drive shaft having a signal path connected to the test wave transmission / reception unit, and the drive shaft accommodated therein. A sheath to be inserted into the body, a liquid injection part for injecting liquid in communication with the inside of the sheath, provided in a member disposed outside the body provided on the proximal end side of the sheath, and disposed outside the body A relief valve provided in a communication portion that communicates with the inside of the sheath formed in the member, and the relief valve passes through the communication portion and the liquid from the liquid injection portion to the sheath. Reduce excess pressure associated with injection of

According to the diagnostic imaging catheter configured as described above, the relief valve reduces excessive pressure, and as a result, the extension of the drive shaft and the backflow of liquid to the proximal end side are suppressed. The function of the diagnostic imaging catheter is exhibited more satisfactorily, such as obtaining a good image by suppressing the residual.

In addition, the hub unit is provided with a fluid tightness between a drive unit that drives the drive shaft and a hub unit that is provided on the base end side of the members disposed outside the body and is connected to the drive unit. If the communication part and the relief valve are provided on the distal end side of the sealed member, the excessively pressurized liquid that flows back to the proximal end side is caused by the relief valve on the distal end side with respect to the seal member. Since the pressure is reduced and stopped by the sealing member, the leakage of the liquid to the driving device is more effectively prevented.

Further, if the communication part and the relief valve are provided in the liquid injection part, the liquid is depressurized at an early stage from when it is injected until it is filled in the sheath. Do not move in the diagnostic imaging catheter under high pressure. As a result, at least one of the extension of the drive shaft, the back flow of the liquid to the proximal end side, and the remaining of the bubbles is more effectively suppressed, so that the diagnostic imaging catheter that obtains an image with excellent visibility can be obtained. Function is demonstrated better.

Further, if the communication part and the relief valve are provided on a detachable detachable member that communicates with the liquid injection part, the existing image diagnostic catheter can be utilized without changing the design, or the design can be changed. Since the relief valve can be provided while being suppressed, the above-described desired effect can be easily obtained.

It is a figure which shows schematic structure of the catheter for image diagnosis of 1st Embodiment. It is a figure which shows schematic structure of the catheter for image diagnosis of 1st Embodiment. It is sectional drawing which shows schematic structure of the part by the side of the base end of the catheter for image diagnosis of 1st Embodiment. It is sectional drawing which shows schematic structure of the part by the side of the front end of the catheter for image diagnosis of 1st Embodiment. It is a figure which shows schematic structure of the catheter for image diagnosis of 1st Embodiment, and the syringe, the drive device, control apparatus, and display apparatus which are connected to the base end side. It is sectional drawing which shows schematic structure of the part by the side of the proximal end of the catheter for image diagnosis of 1st Embodiment with which the relief valve opened by the excessive pressure at the time of priming. It is a figure which shows schematic structure of the catheter for an image diagnosis of 1st Embodiment, and the drive device, control apparatus, and display apparatus which are connected to the base end side. It is a figure which shows schematic structure of the catheter for image diagnosis of 2nd Embodiment. It is sectional drawing which shows schematic structure of the part by the side of the base end of the catheter for image diagnosis of 2nd Embodiment. It is sectional drawing which shows schematic structure of the part by the side of the base end of the catheter for image diagnosis of 2nd Embodiment which the syringe connected. It is sectional drawing which shows schematic structure of the modification of a relief valve. It is sectional drawing which shows when a valve body opens about the modification of a relief valve.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and differs from an actual ratio.

<First Embodiment>
As shown in FIG. 1, the diagnostic imaging catheter 100 according to the first embodiment includes an ultrasonic transducer 101 (examination wave transmitting / receiving unit) that transmits and receives ultrasonic waves (examination waves), and an ultrasonic transducer 101 at the tip. And a drive shaft 102 provided in the section. The diagnostic imaging catheter 100 includes a sheath 103 in which an ultrasonic transducer 101 and a drive shaft 102 are accommodated. The diagnostic imaging catheter 100 includes a tube portion 110 and a hub portion 120 that are provided on the proximal end side of the sheath 103 and disposed outside the body.

The sheath 103 is inserted into a body cavity such as a blood vessel, a bile duct, a urethra, or a digestive tract. The sheath 103 has flexibility. Examples of the constituent material of the sheath 103 include polyolefins such as polyvinyl chloride, polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polystyrene, polyurethane, and polyamide. , Polyimide, polyoxymethylene, polyvinyl alcohol, polytetrafluoroethylene, polyvinylidene fluoride, other resins such as fluororesin, thermoplastic elastomers such as polyamide elastomer and polyester elastomer, various rubbers such as silicone rubber and latex rubber It is done. A reinforcing layer may be provided on the inner surface or the outer surface of the sheath 103. Examples of the constituent material of the reinforcing layer include stainless steel, Ni—Ti, or a composite material of a synthetic resin and a metal.

The outer diameter of the sheath 103 is, for example, 0.5 mm to 3 mm. The axial length of the sheath 103 is, for example, 30 cm to 200 cm. The dimensions of the sheath 103 are not limited to these.

The drive shaft 102 extends to the hub part 120 through the inside of the pipe part 110. The proximal end of the drive shaft 102 is fixed to the hub portion 120.

As shown in FIG. 2, the ultrasonic transducer 101 and the drive shaft 102 move back and forth within the sheath 103 in conjunction with the forward and backward movement of the hub portion 120. The tube part 110 covers and protects the drive shaft 102 between the sheath 103 and the hub part 120.

The pipe part 110 has an outer pipe 111 and an inner pipe 112 through which the drive shaft 102 passes. The tube part 110 includes a connector 113 provided on the distal end side of the outer tube 111 and having a hollow shape that connects the sheath 103 and the outer tube 111. The tube part 110 includes a connector 114 provided on the proximal end side of the outer tube 111 and having a hollow shape that connects the outer tube 111 and the inner tube 112 in a telescopic manner. The inner pipe 112 is connected to the hub portion 120.

When the hub portion 120 is pulled to the proximal end side, the inner tube 112 that has been housed in the outer tube 111 is pulled out through the connector 114. Since the stopper 115 that is hooked to the connector 114 is provided at the tip of the inner tube 112, the inner tube 112 does not come out of the connector 114. When the hub portion 120 is pushed toward the distal end side, the drawn out inner tube 112 passes through the connector 114 and fits inside the outer tube 111.

As shown in FIG. 3, the hub portion 120 covers a connector 121 that is mechanically and electrically coupled to a drive device that drives the drive shaft 102, a signal path 102a that is electrically connected to the connector 121, and the signal path 102a. It has a pipe 122.

The pipe 122 is fixed to the proximal end of the drive shaft 102 on the distal end side. The signal path 102 a passes through the pipe 122 and the drive shaft 102 and is electrically connected to the ultrasonic transducer 101. The drive shaft 102 has a configuration in which a signal path 102a is passed through a flexible tube. This tubular body is constituted by, for example, multilayer coils having different winding directions around the axis. Examples of the constituent material of the coil include stainless steel and Ni—Ti. The signal path 102 a transmits an electrical signal between the driving device connected to the connector 121 and the ultrasonic transducer 101.

The hub part 120 has a rotor 123 that holds the base end of the pipe 122 and the connector 121. The rotor 123 is held inside the hub portion 120 so as to be rotatable about an axis. The connector 121, the signal path 102 a, the rotor 123, the pipe 122, the drive shaft 102, and the ultrasonic transducer 101 rotate around the axis by the force around the axis applied from the drive device connected to the connector 121.

The hub part 120 has a port 124 (injection part) through which physiological saline (liquid) can be injected. The port 124 has a cylindrical shape in which an opening 124 a is formed on the side opposite to the side connected to the hub portion main body 125. The port 124 communicates with a passage 126 formed inside the hub portion main body 125 and communicating with the sheath 103. The hub part 120 has an O-ring 127 (seal member) that keeps the space between the drive unit connected to the connector 121 and the hub part 120 liquid-tight, on the proximal end side of the passage 126.

The physiological saline injected from the port 124 passes through the passage 126 and flows into the inner tube 112 and the protective tube 116 that covers the drive shaft 102 inside the inner tube 112. The O-ring 127 prevents the physiological saline from leaking to the base end side of the O-ring 127. The physiological saline flows from the inner tube 112 and the protective tube 116 into the sheath 103 through the connector 114, the outer tube 111, and the connector 113 provided on the distal end side thereof.

The hub portion 120 has a relief valve 129 provided in a hole 128 (communication portion) formed in the port 124. The hole 128 communicates with the inside of the port 124 and communicates with the inside of the sheath 103 through the passage 126. The hole 128 and the relief valve 129 are provided on the tip side of the O-ring 127.

The relief valve 129 includes a valve body 129a that closes the communication between the inside and the outside of the port 124 through the hole 128 and a spring 129b that biases the valve body 129a to close. The relief valve 129 has an enclosing wall 129 c that is provided so as to surround the hole 128 and in which the spring 129 b is accommodated. One end of the spring 129 b is fixed to the outer periphery of the port 124. The other end of the spring 129b is fixed to the valve body 129a. The valve body 129a is closed by being biased by a spring 129b and is in close contact with the edge of the surrounding wall 129c.

As shown in FIG. 4, a hole 103 a communicating with the inside of the sheath 103 is formed at the distal end portion of the sheath 103. When the physiological saline flows into the sheath 103, the air inside the sheath 103 is expelled from the sheath 103 through the hole 103a. By excluding air from the inside of the sheath 103, in particular, by excluding air from the inside of the sheath 103 so that no bubbles remain in the vicinity of the ultrasonic transducer 101, the ultrasonic wave propagates well, so that the visibility is excellent. You can get a good picture. The ultrasonic transducer 101 is housed in a housing 101 a fixed to the tip of the drive shaft 102. The ultrasonic transducer 101 is, for example, an ultrasonic transducer.

A tubular member 104 into which the guide wire W is inserted is integrally provided at the distal end portion of the sheath 103 so as to follow the sheath 103. A marker 105 having X-ray contrast is attached to a member 104 through which the guide wire W is inserted.

As shown in FIG. 5, the hub portion 120 is coupled to the drive device 10 that drives the drive shaft 102, and the physiological effect is applied to the sheath 103 in a state where the hub portion 120 is pulled toward the proximal end and the inner tube 112 is pulled out most. Priming to fill with saline solution is performed. Priming may be performed before the hub portion 120 is connected to the driving device 10. In priming, the distal end of the syringe S filled with physiological saline is inserted into the port 124, and the pusher is pushed, whereby the physiological saline is pressed into the sheath 103 through the port 124.

As shown in FIG. 6, during priming, if an operator applies more pressure than necessary, for example, by quickly and strongly pushing the pusher of the syringe S, the force is greater than the biasing force of the spring 129b in the direction of closing the valve body 129a. Is added in the direction of opening the valve body 129a, and as a result, the relief valve 129 opens the valve body 129a to reduce the pressure. When the relief valve 129 is opened, air or physiological saline is released through the hole 128 in a direction crossing the physiological saline injection direction. Since the relief valve 129 reduces excessive pressure through the hole 128, the extension of the drive shaft 102 due to the injection of physiological saline is suppressed. The relief valve 129 is closed at a pressure lower than a predetermined pressure, and is opened at a predetermined pressure or higher.

The pressure when the relief valve 129 opens is, for example, 0.2 MPa or more, but is not limited to this as long as the excessive pressure can be reduced to suppress the extension of the drive shaft 102. The pressure at which the relief valve 129 opens can be set as appropriate according to the material of the members constituting the drive shaft 102, the dimensions of the sheath 103, the viscosity of the liquid to be injected, and the like.

As shown in FIG. 7, after priming, the ultrasonic transducer 101 pushed to the most distal side is rotated around the axis by the driving device 10 and transmitted and received ultrasonic waves while being moved to the proximal side. The image inside is obtained.

The drive device 10 includes a rotation drive device 11 that is connected to the hub portion 120 and rotates the drive shaft 102 around the axis, and a linear drive device 12 that moves the rotation drive device 11 in the axial direction.

The rotation drive device 11 includes a connector 11a connected to a connector 121 provided in the hub portion 120, a rotary joint 11b that rotatably supports the connector 11a around an axis, a motor 11c that rotates the connector 11a around an axis, And an encoder 11d for detecting the rotation angle of the motor 11c.

The linear drive device 12 includes a ball screw 12a, a support portion 12b that supports the rotation drive device 11 and is coupled to the ball screw 12a, and a motor 12c that rotates the ball screw 12a.

When the motor 12c rotates the ball screw 12a, the support portion 12b moves forward and backward. The rotary drive device 11 moves forward and backward together with the support portion 12b. As the rotation drive device 11 moves, the hub 120, the inner tube 112, the drive shaft 102, and the ultrasonic transducer 101 move in the axial direction.

The linear drive device 12 has a movement amount detector 12d for detecting the operation of the motor 12c and calculating the movement amount of the rotation drive device 11. The movement amount detector 12d is, for example, a three-phase encoder. The linear drive device 12 includes a base 12e on which the ball screw 12a is installed, and a holding member 12f that is provided on the base 12e and holds the connector 114.

The control device 20 that controls the driving device 10 is electrically connected to the motor 11c, the encoder 11d, the motor 12c, and the movement amount detector 12d. The control device 20 controls the rotation of the motor 11c based on the signal from the encoder 11d. As a result, the rotation of the drive shaft 102 and the ultrasonic transducer 101 around the axis is controlled. The control device 20 controls the rotation of the motor 12c based on the signal from the movement amount detector 12d. Thereby, the axial movement of the drive shaft 102 and the ultrasonic transducer 101 is controlled.

The ultrasonic transducer 101 moves to the proximal side in the axial direction while rotating around the axis, and is ultrasonic based on a signal sent from the control device 20 via the signal path 102a inside the rotary drive device 11 and the drive shaft 102. Is emitted into the body cavity and the reflected wave is received. A signal based on the reflected wave received by the ultrasonic transducer 101 is transmitted from the ultrasonic transducer 101 to the control device 20 via the signal path 102 a and the rotation drive device 11. The control device 20 generates a tomographic image of the body cavity based on the signal sent from the ultrasonic transducer 101 and displays the generated image on the electrically connected monitor 30.

The effect of this embodiment will be described.

In the diagnostic imaging catheter 100 of the present embodiment, when physiological saline is injected at a pressure higher than necessary during priming, the relief valve 129 reduces the pressure excessively. As a result, the elongation and breakage of the drive shaft 102, particularly the elongation and breakage of the signal path 102a provided therein is suppressed.

In addition, the excessive pressure caused by the injection of the physiological saline is reduced by the relief valve 129, so that the reverse flow of the physiological saline toward the proximal end of the diagnostic imaging catheter 100 is suppressed. Leakage of saline is prevented. For this reason, the short circuit and corrosion of the rotation drive device 11 are prevented, and the rotation drive device 11 operates favorably, and the function of the diagnostic imaging catheter 100 is thereby exhibited better.

Furthermore, since the excessive pressure caused by the injection of the physiological saline is suppressed by the relief valve 129, the physiological saline and the gas inside the sheath 103 are smoothly exchanged, so that bubbles remain in the sheath 103. It is difficult to obtain an image with excellent visibility.

In addition, since the hole 128 and the relief valve 129 are provided on the distal end side with respect to the O-ring 127, the physiological saline that is excessively pressurized to flow backward to the proximal end side is disposed on the distal end side with respect to the O-ring 127. Since the pressure is reduced by the pressure and is stopped by the O-ring 127, the leakage of the liquid to the rotary drive device 11 is more effectively prevented.

Further, since the hole 128 and the relief valve 129 are provided in the port 124, the physiological saline is depressurized at an early stage between the time when it is injected and the time when the sheath 103 is filled. The inside of the diagnostic imaging catheter 100 is not moved under high pressure. As a result, the extension of the drive shaft 102, the backflow of the liquid toward the proximal end, and the remaining of bubbles in the sheath 103 are more effectively suppressed, so that an image diagnostic catheter that obtains an image with excellent visibility is obtained. 100 functions are exhibited better.

Second Embodiment
As outlined in FIG. 8, the diagnostic imaging catheter 200 of the second embodiment is the first embodiment in that the relief valve 129 is not provided in the port 124 but in the detachable detachable member 201 communicating with the port 124. Different from form. About the operation | movement by another structure and a drive device, since the diagnostic imaging catheter 200 is substantially the same as the diagnostic imaging catheter 100 of 1st Embodiment, the overlapping description here is abbreviate | omitted. In the diagnostic imaging catheter 200, the same reference numerals are assigned to the same components as those in the first embodiment.

As shown in FIG. 9, the relief valve 129 is provided in a hole 202 (communication portion) communicating with the inside of the detachable member 201. The configuration and function of the relief valve 129 itself are the same as in the first embodiment. The detachable member 201 has a cylindrical shape in which

openings

201a and 201b are formed at both ends in a direction orthogonal to the circular cross section.

The diameter of the periphery forming the opening 201b is smaller than the diameter of the opening 124a of the port 124. The detachable member 201 is connected to the port 124 by inserting the end on the side where the opening 201b is formed into the opening 124a. The detachable member 201 inserted and connected to the port 124 can be removed from the port 124 by being pulled out.

The connection between the detachable member 201 and the port 124 is a so-called luer lock system in which the connection is maintained by a fastening force by a screw in addition to a frictional force between members fitted to each other, but is not limited thereto. For example, the connection between the detachable member 201 and the port 124 may be a so-called luer slip method in which the connection is maintained by the frictional force between the members that fit together.

As shown in FIG. 10, physiological saline is injected from the syringe S inserted into the opening 201 a of the detachable member 201. The physiological saline passes through the removable member 201, the port 124, and the passage 126 and is filled into the sheath 103. If excessive pressure is applied, the relief valve 129 opens to reduce the pressure.

If the detachable member 201 of the present embodiment is used, the relief valve 129 can be provided while making use of an existing diagnostic imaging catheter such as a commercially available one without changing the design or suppressing the change in design. The effect of one embodiment can be obtained easily.

The present invention is not limited to the embodiment described above, and can be variously modified within the scope of the claims.

For example, the diagnostic imaging catheter is not limited to an IVUS (Intra Vascular Ultra Sound) or the like that obtains an image using an ultrasonic wave as an inspection wave as in the above embodiment. The diagnostic imaging catheter may be an OCT (Optical Coherence Tomography) or the like that obtains an image using light as an inspection wave. In this case, the signal path provided inside the drive shaft is an optical fiber that transmits light as a signal, and the inspection wave transmitting / receiving unit emits the light transmitted by the optical fiber into the body and receives the reflected light. A prism optically connected to the optical fiber is provided to be directed to the optical fiber again.

In the above embodiment, physiological saline is used as the liquid to be injected into the sheath, but the present invention is not limited to this. For example, when an image is obtained using light as in OCT, a contrast agent is used as a liquid to be injected into the sheath. Since the viscosity of such a contrast agent is generally higher than that of physiological saline, the fluid pressure during priming is increased, but excessive pressure is prevented from being applied by the relief valve.

Further, the relief valve is not limited to the above embodiment. For example, the relief valve may be an umbrella valve 130 as shown in FIG. As shown in FIG. 12, in the umbrella valve 130, when excessive pressure is applied, the umbrella-shaped valve body 130a that blocks the hole 131 (communication portion) communicating with the inside of the port 124 opens so as to warp. , Reduce the pressure.

Further, the communication part and the relief valve may be provided on a member disposed outside the body, and are not limited to the form provided on the port 124 as in the above embodiment. For example, in the above embodiment, the present invention includes a form in which a hole (communication portion) communicating with the passage 126 is formed in the hub portion main body 125 instead of the port 124, and a relief valve is provided in the hole. In addition, the present invention includes a form in which a hole (communication portion) communicating with the sheath 103 is formed in the connector 113 or the connector 114 instead of the hub portion 120 and a relief valve is provided in the hole.

10 drive device,
11 Rotation drive device,
12 linear drive,
20 control device,
30 monitor,
100, 200 Imaging diagnostic catheter,
101 ultrasonic transducer (inspection wave transmitter / receiver),
102 drive shaft,
102a signal path,
103 sheath,
110 Pipe part (member arranged outside the body),
111 outer tube,
112 inner pipe,
113 connector,
114 connector,
120 Hub part (member arranged outside the body),
124 port (injection part),
127 O-ring (seal member),
128 holes (communication part),
129 Relief valve,
130 Umbrella valve (relief valve),
131 hole (communication part),
201 detachable member,
202 hole (communication part),
S syringe,
W Guide wire.

Claims

A driving shaft having a signal path connected to the inspection wave transmission / reception unit while being provided with an inspection wave transmission / reception unit at a tip part;
A sheath to be inserted into the body containing the drive shaft;
A liquid injection part provided in a member disposed outside the body provided on the proximal end side of the sheath, injecting liquid in communication with the inside of the sheath;
A relief valve provided at a communication portion communicating with the inside of the sheath formed on the member disposed outside the body,
The relief valve is an imaging diagnostic catheter that reduces an excessive pressure accompanying the injection of the liquid from the liquid injection part to the sheath through the communication part.
The hub portion is provided in the hub portion, which is liquid-tightly maintained between a drive device that drives the drive shaft and a hub portion that is provided on the base end side of the members arranged outside the body and is connected to the drive device. The diagnostic imaging catheter according to claim 1, wherein the communication portion and the relief valve are provided on the distal end side of the seal member.
3. The diagnostic imaging catheter according to claim 1, wherein the communication part and the relief valve are provided in the liquid injection part.
3. The diagnostic imaging catheter according to claim 1, wherein the communication part and the relief valve are provided on a detachable detachable member that communicates with the liquid injection part.