JP6455885B2 - Diagnostic imaging catheter - Google Patents

Description

  The present invention relates to a diagnostic imaging catheter.

  As a diagnostic imaging catheter for obtaining a tomographic image of a blood vessel or the like, a catheter for obtaining an image by intravascular ultrasound (IVUS) or a catheter for obtaining an image by optical coherent tomography (OCT) is available. is there.

  The diagnostic imaging catheter has a long sheath, a drive shaft rotatably accommodated in the sheath, and a test wave transmission / reception unit provided at the tip of the drive shaft (see, for example, Patent Document 1).

  When obtaining a tomographic image, the inspection wave transmission / reception unit moves in the sheath toward the proximal end while rotating with the drive shaft while transmitting / receiving the inspection wave. In order to efficiently transmit and receive the inspection wave, a priming solution such as physiological saline is filled in the sheath.

  A motor drive unit (Motor Drive Unit: MDU) connected to the proximal end of the diagnostic imaging catheter moves the drive shaft to the proximal end side while rotating the drive shaft. The diagnostic imaging catheter is connected to a motor drive unit (MDU) via a hub portion provided at the proximal end. The hub portion rotatably supports a connector fixed to the base end of the drive shaft. The motor drive unit (MDU) rotates the connector, and the drive shaft rotates in conjunction with the rotation of the connector.

  In order to prevent liquids such as priming liquid from moving along the drive shaft to the proximal end side and leaking to the motor drive unit (MDU), a seal member such as an O-ring is placed around the drive shaft inside the hub portion. Provided.

  The drive shaft has a tube shape constituted by a coil wound around the axis of the drive shaft. When the seal member is in direct contact with the outer periphery of the drive shaft, a gap may be formed between the drive shaft and the seal member due to the uneven shape formed by the coil on the outer surface of the drive shaft. For this reason, in Patent Document 1, a pipe is inserted between the seal member and the drive shaft so as to cover the drive shaft.

  Since the outer peripheral surface of the pipe is smooth and a gap is hardly formed between the pipe and the sealing member, the sealing performance is improved. The pipe extends to the base end side and is fixed to the connector, and rotates in conjunction with the rotation of the connector while maintaining a sealing property with the seal member.

JP 2011-72680 A

  When the base end side is eccentric with respect to the axis of the pipe tip side where the seal member is disposed, shaft blurring occurs as the connector rotates, and shaft blurring occurs from the base end side to the tip end side where the seal member is disposed. It is transmitted.

  If the transmission of such shaft blur is suppressed, the present inventors consider that the stability of contact between the seal member and the pipe is further increased and the sealing performance is further improved, and the present invention has been made.

  That is, an object of the present invention is to provide a diagnostic imaging catheter capable of improving sealing performance by suppressing transmission of axial blur and effectively preventing liquid leakage to the proximal end side.

  In order to achieve the above object, a diagnostic imaging catheter of the present invention has a drive shaft. The diagnostic imaging catheter is provided in communication with the insertion passage, in which an insertion passage through which the drive shaft is inserted is formed, and a hub portion provided with a connector fixed to the base end of the drive shaft. A liquid injection part for injecting the priming liquid. The catheter for diagnostic imaging is a seal member provided around the drive shaft on the proximal side from the liquid injection part, and a reinforcement inserted so as to cover the drive shaft between the seal member and the drive shaft A tube. The diagnostic imaging catheter has an axial blur transmission preventing portion that absorbs axial blur caused by the rotation of the connector, which is provided on the proximal side of the seal member in the axial direction of the drive shaft.

  According to the diagnostic imaging catheter configured as described above, the axial blur is absorbed, and the axial blur is hardly transmitted to the position where the seal member is disposed. For this reason, the sealing performance is improved. Therefore, it is possible to effectively prevent liquid leakage to the base end side.

  Further, the drive shaft has a tube shape constituted by a coil wound around the axis of the drive shaft, and the inside of the reinforcement tube and the coil are filled by a filler filled in the reinforcement tube. If at least one of a configuration in which the inner side is closed and a configuration in which the entire outer periphery of the drive shaft on the base end side with respect to the seal member is covered is provided, the clearance between the coil on the outer periphery of the drive shaft and the coil Since the movement path of the liquid through the inner side is blocked, liquid leakage on the proximal end side of the seal member can be further effectively prevented.

  In addition, there is another reinforcing pipe that covers the drive shaft on the base end side of the reinforcing pipe, and the shaft shake transmission preventing portion is provided between the reinforcing pipe and the other reinforcing pipe. If it is made to have high flexibility, the drive shaft is covered with another reinforcing tube on the base end side with respect to the flexible shaft shake transmission preventing portion, and flexible bending is suppressed. For this reason, the connector fixed to the base end of the drive shaft is not easily displaced.

  Further, the reinforcing tube extends to the tip side from the seal member, and a spiral blade or groove is formed on the outer periphery of the extended portion, and rotates in conjunction with the drive shaft. Therefore, if a flow of a liquid having a velocity component toward the distal end in the axial direction is generated, the liquid toward the proximal end is pushed back toward the distal end before the seal member, and an excessive pressure is applied to the seal member. Since it is difficult, the seal member can more reliably prevent liquid leakage.

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 expands and shows the front-end | tip part of the catheter for image diagnosis of 1st Embodiment. It is sectional drawing which shows the hub part provided in the proximal end of the catheter for image diagnosis of 1st Embodiment. It is sectional drawing which expands and shows the principal part in the hub part shown by FIG. It is a figure which shows typically the catheter for image diagnosis of 1st Embodiment in the case of priming, and its periphery apparatus. It is a figure which shows typically the catheter for image diagnosis of 1st Embodiment after priming, and its periphery apparatus. It is a figure which shows typically the catheter for image diagnosis of 1st Embodiment in the case of a diagnosis, and the peripheral device. It is sectional drawing which expands and shows the hub part provided in the base end of the catheter for image diagnosis of 2nd Embodiment. It is sectional drawing which expands and shows the principal part in the hub part shown by FIG. It is sectional drawing which expands and shows the hub part provided in the base end of the catheter for image diagnosis of 3rd Embodiment.

  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 of the first embodiment includes a drive shaft 102 provided with a test wave transmission / reception unit 101 at the distal end, a sheath 103 containing the drive shaft 102, and the drive shaft 102. And a hub portion 110 provided on the base end side of the.

  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, and 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.

  As shown in FIG. 2, the drive shaft 102 extends through the sheath 103, the outer tube 120 connected to the proximal end of the sheath 103, and the inner tube 121 connected to the outer tube 120 to the inside of the hub portion 110.

  The hub part 110, the inner tube 121, the drive shaft 102, and the inspection wave transmission / reception part 101 move back and forth in the axial direction integrally. When the user pushes the hub portion 110 toward the distal end side, the inner tube 121 is pushed into the outer tube 120, and the drive shaft 102 and the inspection wave transmitting / receiving portion 101 move inside the sheath 103 toward the distal end side. When the user pulls the hub portion 110, the inner tube 121 is pulled out from the outer tube 120, and the drive shaft 102 and the test wave transmitting / receiving unit 101 move to the proximal end side inside the sheath 103. When the hub portion 110 is pulled most proximally, the distal end of the inner tube 121 is hooked on a connecting portion 122 provided at the proximal end of the outer tube 120. For this reason, the inner tube 121 cannot be removed from the outer tube 120.

  As shown in FIG. 3, the drive shaft 102 has a tube shape constituted by a coil wound around the axis of the drive shaft 102. The drive shaft 102 has flexibility. A signal line 102 a connected to the inspection wave transmitting / receiving unit 101 passes through the drive shaft 102. The inspection wave transmitting / receiving unit 101 is housed in a housing 101 a fixed to the tip of the drive shaft 102.

  When an image is obtained by intravascular ultrasound (Intra Vessel Ultra Sound: IVUS), the inspection wave transmission / reception unit 101 includes an ultrasonic transducer and transmits / receives an ultrasonic wave as an inspection wave. In this case, the signal line 102a is, for example, a twisted pair cable or a coaxial cable, and the inspection wave transmitting / receiving unit 101 is electrically connected to the signal line 102a. In IVUS, the attenuation of ultrasonic waves due to air in the sheath 103 is reduced, and the inspection wave transmission / reception unit 101 efficiently transmits and receives ultrasonic waves, so that physiological saline is filled in the sheath 103 as a priming solution.

  When an image is obtained by optical coherence tomography (OCT), the inspection wave transmission / reception unit 101 is configured by a lens or a mirror and transmits / receives near infrared light as an inspection wave. In this case, the signal line 102a is an optical fiber that transmits near-infrared light, and the inspection wave transmission / reception unit 101 is optically connected to the signal line 102a. In OCT, for example, a contrast medium is filled in the sheath 103 as a priming solution so that the inspection wave transmission / reception unit 101 efficiently transmits and receives near-infrared light by reducing reflection due to a difference in refractive index.

  A tubular member 104 into which the guide wire W is inserted is integrally formed 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 the tubular member 104.

  As shown in FIG. 4, the hub portion 110 includes a hub portion main body 111 in which an insertion passage 111 a through which the drive shaft 102 is inserted, and a connector 115 rotatably provided on the proximal end side of the hub portion main body 111. Have.

  The hub portion 110 includes a port 111b (a liquid injection portion) communicating with the insertion passage 111a, and a seal member 113 provided around the drive shaft 102 on the proximal end side with respect to the port 111b. A hole 116 communicating with the outside is formed in the hub portion main body 111 on the proximal end side with respect to the seal member 113.

  The hub portion 110 includes a pipe 112 (reinforcing pipe) inserted between the seal member 113 and the drive shaft 102 so as to cover the drive shaft 102, and other pipes covering the drive shaft 102 on the proximal end side of the pipe 112. 114 (another reinforcing pipe). The hub part 110 has a bearing 111c that rotatably supports the pipe 114.

  The hub portion 110 includes a shaft shake transmission preventing portion 117 provided on the base end side of the seal member 113 in the axial direction of the drive shaft 102. The shaft shake transmission preventing portion 117 is provided between the pipe 112 and the pipe 114.

  An inner tube 121 is connected to the distal end portion of the hub body 111. The inner tube 121, the insertion passage 111a, and the port 111b communicate with each other. The drive shaft 102 is pulled out from the inner pipe 121, passes through the pipe 112 and the pipe 114, and is fixed to the connector 115 at the proximal end. A signal line 102 a (see FIG. 3) inside the drive shaft 102 is connected to the connector 115.

  The pipe 114 is fixed to the connector 115 at the base end. The pipe 114 and the drive shaft 102 rotate in conjunction with the rotation of the connector 115. The pipe 112 is separated from the pipe 114 and does not rotate in conjunction with the rotation of the connector 115.

  The shaft blur transmission preventing portion 117 is formed to be exposed without the drive shaft 102 being covered. The flexibility of the drive shaft 102 is higher than that of the pipe 112 and the pipe 114, and thus the shaft shake transmission preventing portion 117 has higher flexibility than the pipe 112 and the pipe 114. The pipe 112 and the pipe 114 serve as a reinforcing pipe that reinforces the drive shaft 102, and the material forming the pipe 112 and the pipe 114 is, for example, a metal such as stainless steel, polyimide, polyether ether ketone, or the like. It is a hard resin.

  As shown in FIG. 5, the outer periphery of the drive shaft 102 has a layered structure in which coils 102b, 102c, and 102d wound around the axis of the drive shaft 102 overlap each other. The winding directions of the coils 102b, 102c, and 102d are alternately changed, for example, right-handed, left-handed, and right-handed. The material for forming the coils 102b, 102c, and 102d is, for example, stainless steel or Ni—Ti. In FIG. 5, the signal line 102a (see FIG. 3) passing through the inside of the drive shaft 102 is omitted.

  The outer surface of the drive shaft 102 is formed by the coil 102b and has an uneven shape. Due to this uneven shape, if the outer surface of the drive shaft 102 is in direct contact with the seal member 113, there is a possibility that a gap will be formed between them. However, in this embodiment, the pipe 112 is disposed between the drive shaft 102 and the seal member 113, and the outer surface of the drive shaft 102 does not directly contact the seal member 113. Since the outer peripheral surface of the pipe 112 is smooth and easily adheres to the seal member 113, the sealing performance is excellent.

  In addition to the priming liquid injected from the port 111b, the seal member 113 prevents leakage of body fluid such as blood entering the catheter to the proximal end side. The seal member 113 is, for example, an O ring, an X ring, a V ring, or the like.

  The inside of the pipe 112 and the inside of the coils 102b, 102c, and 102d are closed by the filler 118 filled in the pipe 112. The material for forming the filler 118 is, for example, a resin such as cyanoacrylate, epoxy, acrylic, silicon, polyolefin, or urethane.

  Next, an example of use of the diagnostic imaging catheter 100 will be described.

  As shown in FIG. 6, the diagnostic imaging catheter 100 is used together with the motor driving device 10 connected to the hub portion 110.

  The motor driving device 10 is connected to the connector 115 inside the hub portion 110 and rotates it. The motor driving device 10 includes a motor 10a that is a power source for rotating the drive shaft 102, and a motor 10b that is a power source for moving the drive shaft 102 in the axial direction. The rotational motion of the motor 10b is converted into axial motion by a ball screw 10c connected to the motor 10b.

  Operation | movement of the motor drive device 10 is controlled by the control apparatus 20 electrically connected to this. The control device 20 includes a CPU (Central Processing Unit) and a memory as main components. The control device 20 is electrically connected to the monitor 30.

  The user first connects the hub unit 110 to the motor drive device 10. Thereafter, the user connects the syringe S containing the priming liquid to the port 111b and presses the pusher of the syringe S to fill the sheath 103 with the priming liquid. Before the priming operation, the user pulls the hub portion 110 to the most proximal side and keeps the inner tube 121 pulled out. The hub portion 110, the inner tube 121, and the outer tube 120 communicate with the sheath 103.

  As shown in FIG. 7, after priming, the user pushes the hub portion 110 until it abuts against the proximal end of the connecting portion 122 and moves the inspection wave transmitting / receiving portion 101 to the distal end side. In this state, the sheath 103 is inserted along the guide wire W at a target position in the body cavity.

  As shown in FIG. 8, when obtaining a tomographic image at a target position in the body cavity, the inspection wave transmission / reception unit 101 transmits / receives inspection waves while moving to the proximal end side together with the drive shaft 102. At this time, the inspection wave transmission / reception unit 101 rotates together with the drive shaft 102.

  The control device 20 controls the motor 10a and controls the rotation of the drive shaft 102 around the axis. The control device 20 controls the motor 10b and controls the movement of the drive shaft 102 in the axial direction.

  Based on a signal sent from the control device 20, the test wave transmitting / receiving unit 101 transmits a test wave into the body. A signal corresponding to the reflected wave from the body received by the inspection wave transmitting / receiving unit 101 is sent to the control device 20 via the drive shaft 102 and the motor driving device 10. The control device 20 generates a tomographic image of the body cavity based on the signal transmitted from the examination wave transmission / reception unit 101 and displays the generated image on the monitor 30.

  The effect of this embodiment is described.

  Even when the hub portion 110 rotates with the base end side of the pipe 112 being eccentric with respect to the axis of the pipe 112, the flexible shaft shake transmission preventing portion 117 functions like a coupling to prevent shaft shake. Absorb. For this reason, transmission of the shaft blur to the pipe 112 is suppressed. As a result, the stability of contact between the seal member 113 and the pipe 112 is increased and the sealing performance is improved, so that liquid leakage closer to the base end side than the seal member 113 can be effectively prevented.

  By preventing liquid leakage from the seal member 113 to the base end side, liquid such as priming liquid or body fluid does not enter the motor drive device 10 and the motor drive device 10 operates well.

  The shaft blur transmission preventing unit 117 absorbs shaft blur and suppresses shaft blur from being transmitted from the proximal end side to the distal end side. For this reason, fluttering of the inspection wave transmitting / receiving unit 101 attached to the tip of the drive shaft 102 is suppressed. Therefore, a good image can be obtained.

  Unlike the present embodiment, when there is no filler 118 inside the pipe 112, if liquid enters the inside of the coil 102 b, 102 c, 102 d through the gap between the coils 102 b, 102 c, 102 d on the tip side of the seal member 113, the liquid remains as it is. There is a risk of moving through the inside of the drive shaft 102 to the proximal end side with respect to the seal member 113. Since the drive shaft 102 is exposed in the shaft shake transmission preventing portion 117, the liquid that has moved to the proximal end side of the seal member 113 leaks to the outside from the gap between the coils 102b, 102c, and 102d at the exposed portion. As a result, there is a risk of liquid leakage from the seal member 113 to the base end side.

  On the other hand, in the present embodiment, the filler 118 closes the inside of the pipe 112 and the inside of the coils 102b, 102c, and 102d, thereby passing the gap between the coils 102b, 102c, and 102d and the inside of the coils 102b, 102c, and 102d. The movement path of the liquid is blocked. For this reason, the liquid leakage at the base end side of the seal member 113 can be further effectively prevented.

  The drive shaft 102 is covered by the pipe 114 on the base end side with respect to the flexible shaft shake transmission preventing portion 117, and the flexible bending is suppressed. For this reason, the connector 115 is not easily displaced.

  Since the hole 116 is formed in the hub part main body 111, even if the liquid leaks to the base end side from the seal member 113, the liquid is discharged to the outside of the hub part main body 111. Accordingly, liquid leakage to the motor drive device 10 can be effectively prevented.

Second Embodiment
As shown in FIG. 9, the diagnostic imaging catheter 200 of the second embodiment differs from the first embodiment in that it includes a shaft blur transmission preventing unit 217 having a configuration different from that of the first embodiment. In the shaft shake transmission preventing portion 217, the drive shaft 102 is not exposed between the pipe 112 and the pipe 114 as in the first embodiment. About another structure, the catheter 200 for image diagnosis of 2nd Embodiment is as substantially the same as 1st Embodiment. The same configurations in the first embodiment and the second embodiment are denoted by the same reference numerals as those in the first embodiment in the drawings, and redundant description is omitted.

  As shown in FIG. 10, the shaft shake transmission preventing portion 217 has a configuration in which the drive shaft 102 is covered with a covering member 217 a having higher flexibility than the pipes 112 and 114. The material forming the covering member 217a is, for example, a resin such as polyethylene, polyolefin, fluorine-based polymer, elastomer, nylon, or silicon. The pipe 112, the covering member 217a, and the pipe 114 are integrally formed. The pipe 112, the covering member 217 a, and the pipe 114 cover the entire outer periphery of the drive shaft 102 on the proximal end side with respect to the seal member 113. In the present embodiment, the filler 118 of the first embodiment inside the pipe 112 is omitted, but the filler 118 may be provided as in the first embodiment.

  The effect of this embodiment is described.

  Since the shaft shake transmission preventing unit 217 functions in the same manner as the shaft shake transmission preventing unit 117 of the first embodiment, the same effects as those of the first embodiment are achieved.

  The pipe 112, the covering member 217a, and the pipe 114 cover the entire outer periphery of the drive shaft 102 on the proximal end side with respect to the seal member 113. For this reason, even if liquid intrudes into the drive shaft 102 on the distal end side of the seal member 113, liquid leakage on the proximal end side of the seal member 113 is prevented.

  Regarding other operational effects, the second embodiment is the same as the first embodiment.

<Third Embodiment>
As shown in FIG. 11, the diagnostic imaging catheter 300 of the third embodiment has a long pipe 312 on the tip side compared to the pipe 112 of the second embodiment, and a spiral shape formed on the outer periphery of the pipe 312 on the tip side. It differs from 2nd Embodiment by the point which has the blade | wing 312a. About another structure, since 3rd Embodiment is as substantially the same as 2nd Embodiment, the code | symbol similar to 2nd Embodiment is attached | subjected in a figure, and the overlapping description is abbreviate | omitted.

  The spiral blade 312 a is formed on the outer periphery of a portion of the pipe 312 that extends to the tip side of the seal member 113. The outer periphery of the blade 312a and the inner periphery of the insertion path 111a are close to each other. Since the pipe 312 is formed integrally with the shaft shake transmission preventing portion 217 and the pipe 114, when the connector 115 rotates, the pipe 312 and the blade 312a rotate in conjunction with the rotation.

  Since the insertion passage 111a is filled with the priming liquid on the tip side of the seal member 113, the rotation of the blade 312a causes a flow toward the tip side in the axial direction. The rotation speed of the connector 115, the pipe 312 and the blade 312a is, for example, 1800 rpm.

  The effect of this embodiment is described.

  In the present embodiment, the blade 312a rotates and functions like an axial flow pump, so that the flow of the priming liquid to the distal end side is generated, and the movement of the priming liquid is forcibly limited not to move toward the proximal end side. Is done. Accordingly, it is possible to effectively prevent liquid leakage to the base end side.

  The blade 312a is provided on the distal end side of the seal member 113, and the priming liquid directed toward the proximal end side is pushed back to the distal end side before the seal member 113, so that excessive pressure is not easily applied to the seal member 113. Therefore, the seal member 113 can reliably prevent liquid leakage.

  Regarding other operational effects, the third embodiment is the same as the second embodiment.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  For example, in the diagnostic imaging catheter 100 of the first embodiment, the present invention includes a form in which the pipe 114 in the hub portion 110 is omitted and the drive shaft 102 is exposed between the pipe 112 and the connector 115.

  In the first embodiment, the filler 118 inside the pipe 112 is filled at the proximal end of the pipe 112, but it is sufficient that at least a part of the inside of the pipe 112 is filled. The entire inside of 112 may be filled.

  A spiral groove may be formed on the outer periphery of the pipe 312 instead of the blade 312a of the third embodiment. In this case, the pipe 312 is in sliding contact with the inner periphery of the insertion path 111a.

  This application is based on Japanese Patent Application No. 2014-005935 filed on January 16, 2014, the disclosures of which are incorporated by reference in their entirety.

10 motor drive device,
20 control device,
30 monitor,
100, 200, 300 Diagnostic imaging catheter,
101 inspection wave transmission / reception unit,
101a housing,
102 drive shaft,
102a signal line,
102b, 102c, 102d coils,
103 sheath,
103a hole,
110, 210, 310 hub part,
111 Hub body,
111a insertion path,
111b port (injection part),
111c bearing,
112, 312 pipe (reinforcing pipe),
113 sealing member,
114 pipes (other reinforcing pipes),
115 connector,
116 holes,
117, 217 Shaft transmission prevention part,
118 filler,
217a covering member,
312a feathers,
W guide wire,
S Syringe.

Claims (4)

A drive shaft;
A hub portion having an insertion passage through which the drive shaft is inserted and a connector fixed to the base end of the drive shaft; and
A liquid injection part for injecting a priming liquid provided in communication with the insertion path;
A seal member provided around the drive shaft on the proximal side of the liquid injection part;
A reinforcing pipe inserted between the seal member and the drive shaft so as to cover the drive shaft;
A catheter for diagnostic imaging, comprising: an axial blur transmission preventing portion that is provided on the proximal side of the seal member in the axial direction of the drive shaft and absorbs axial blur caused by rotation of the connector.   The drive shaft has a tube shape formed by a coil wound around the axis of the drive shaft, and the inside of the reinforcement tube and the inside of the coil are filled by a filler filled in the reinforcement tube. 2. The diagnostic imaging catheter according to claim 1, wherein the diagnostic imaging catheter has at least one of a closed configuration and a configuration in which the entire outer periphery of the drive shaft on the proximal side of the seal member is covered. Having another reinforcing pipe covering the drive shaft on the proximal side of the reinforcing pipe,
3. The diagnostic imaging catheter according to claim 1, wherein the shaft blur transmission preventing portion is provided between the reinforcing tube and the other reinforcing tube and has higher flexibility than these.   The reinforcing tube extends to the tip side from the seal member, and a spiral blade or groove is formed on the outer periphery of the extended portion, and rotates in conjunction with the drive shaft, The diagnostic imaging catheter according to any one of claims 1 to 3, wherein a flow of a liquid having a velocity component toward an axial distal end is generated.