WO2023008539A1 - 画像診断用カテーテル - Google Patents
画像診断用カテーテル Download PDFInfo
- Publication number
- WO2023008539A1 WO2023008539A1 PCT/JP2022/029205 JP2022029205W WO2023008539A1 WO 2023008539 A1 WO2023008539 A1 WO 2023008539A1 JP 2022029205 W JP2022029205 W JP 2022029205W WO 2023008539 A1 WO2023008539 A1 WO 2023008539A1
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- WIPO (PCT)
- Prior art keywords
- tube
- support tube
- diagnostic imaging
- inner tube
- drive shaft
- Prior art date
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Clinical applications
- A61B8/0891—Clinical applications for diagnosis of blood vessels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0033—Features or image-related aspects of imaging apparatus, e.g. for MRI, optical tomography or impedance tomography apparatus; Arrangements of imaging apparatus in a room
- A61B5/0035—Features or image-related aspects of imaging apparatus, e.g. for MRI, optical tomography or impedance tomography apparatus; Arrangements of imaging apparatus in a room adapted for acquisition of images from more than one imaging mode, e.g. combining MRI and optical tomography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0066—Optical coherence imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0084—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for introduction into the body, e.g. by catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/6852—Catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
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- A—HUMAN NECESSITIES
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- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
- A61B8/445—Details of catheter construction
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
- A61B8/4461—Features of the scanning mechanism, e.g. for moving the transducer within the housing of the probe
Definitions
- the present disclosure relates to diagnostic imaging catheters.
- a diagnostic imaging catheter generally has a pull-back mechanism at its proximal end for changing the relative position of the sheath and the drive shaft in order to continuously observe cross-sections within the body cavity. and an inner tube provided radially inward of the outer tube and radially outward of the drive shaft and axially movable relative to the outer tube and integrally with the drive shaft. .
- an object of the present disclosure is to provide a diagnostic imaging catheter in which the drive shaft is less likely to buckle not only in the outer tube but also in the inner tube during the pushing operation.
- An imaging catheter includes an outer tube, a first support tube provided radially inward of the outer tube, and a drive shaft provided radially inward of the first support tube. an inner tube that is radially inner than the outer tube and radially outer than the first support tube; and an inner tube that is radially inner than the inner tube and radially outer than the drive shaft and the outer tube. a second support tube axially moveable relative to the tube and the first support tube and integrally with the drive shaft and the inner tube.
- the second support tube in the diagnostic imaging catheter, in the most advanced state in which the inner tube is pushed most into the outer tube, the second support tube is radially viewed from the first support tube.
- a redundant imaging catheter in the diagnostic imaging catheter, in the most advanced state in which the inner tube is pushed most into the outer tube, the second support tube is radially viewed from the first support tube.
- the second support tube is the same as the first support tube when viewed in the radial direction even in the most retracted state in which the inner tube is pulled out of the outer tube.
- a redundant imaging catheter is the same as the first support tube when viewed in the radial direction even in the most retracted state in which the inner tube is pulled out of the outer tube.
- the diagnostic imaging catheter is a diagnostic imaging catheter in which the second support tube is provided radially outside the first support tube.
- the diagnostic imaging catheter has a hub connected to the proximal end of the inner tube, and the second support tube is integrally connected to the hub or the inner tube. a catheter.
- the diagnostic imaging catheter is a diagnostic imaging catheter in which the second support tube is provided radially inside the first support tube.
- the diagnostic imaging catheter is a diagnostic imaging catheter that has a hub connected to the proximal end of the inner tube, and the second support tube is integrally connected to the hub.
- the diagnostic imaging catheter is a diagnostic imaging catheter in which the second support tube is coiled.
- the first support tube does not radially overlap the inner tube in the most retracted state in which the inner tube is pulled out from the outer tube. It is a diagnostic imaging catheter.
- FIG. 2 is a plan view showing a state in which an external device is connected to the diagnostic imaging catheter as the first embodiment; 2 is a side view showing the diagnostic imaging catheter shown in FIG. 1 in the most advanced state before pullback operation; FIG. 2 is a side view showing the diagnostic imaging catheter shown in FIG. 1 in the most retracted state after a pullback operation; FIG. FIG. 2 is a cross-sectional view showing the distal end portion of the diagnostic imaging catheter shown in FIG. 1; FIG. 2 is a cross-sectional view showing the proximal end portion of the diagnostic imaging catheter shown in FIG. 1; 2 is a cross-sectional view showing the pullback mechanism of the diagnostic imaging catheter shown in FIG. 1 in the most retracted state; FIG.
- FIG. 2 is a cross-sectional view showing the pullback mechanism of the diagnostic imaging catheter shown in FIG. 1 in the most advanced state;
- FIG. It is a cross-sectional view showing a modification of the pull-back mechanism in the most retracted state.
- FIG. 11 is a cross-sectional view showing another modification of the pullback mechanism in the most retracted state;
- 7B is a cross-sectional view showing the pullback mechanism shown in FIG. 7A in the most advanced state;
- FIG. FIG. 11 is a cross-sectional view showing another modification of the pullback mechanism in the most retracted state;
- the diagnostic imaging catheter 1 is a dual type that uses both intravascular ultrasound (IVUS) and optical coherence tomography (OCT).
- the dual-type diagnostic imaging catheter 1 has three modes: a mode for acquiring a tomographic image only by IVUS, a mode for acquiring a tomographic image only by OCT, and a mode for acquiring tomographic images by both IVUS and OCT. It exists and can be used by switching between these modes.
- a diagnostic imaging catheter 1 is connected to and driven by an external device 2 .
- An imaging diagnostic apparatus 3 is composed of the diagnostic imaging catheter 1 and the external device 2 .
- the diagnostic imaging catheter 1 includes a sheath 4 inserted into a body cavity such as a blood vessel (a blood vessel such as a coronary artery) of a living body, an outer tube 5 connected to a proximal end of the sheath 4, and an outer tube 5 that moves forward and backward. It has an inner tube 6 that can be inserted, a unit connector 7 that connects to the proximal end of the outer tube 5 and holds the inner tube 6 so that it can advance and retreat, and a hub 8 that connects to the proximal end of the inner tube 6 . ing.
- the diagnostic imaging catheter 1 includes a driving shaft 9, a housing 10 fixed to the distal end of the driving shaft 9, and a signal transmitting/receiving section 11 accommodated in the housing 10 and transmitting/receiving ultrasonic and/or light signals. and an imaging core 12 .
- the imaging core 12 is inserted into the sheath 4 , the outer tube 5 and the inner tube 6 , and is axially movable with respect to the sheath 4 and the outer tube 5 together with the inner tube 6 .
- the distal end means the end of the diagnostic imaging catheter 1 that is inserted into the body cavity
- the proximal end means the end that is held outside the body cavity of the diagnostic imaging catheter 1.
- the axial direction means the direction along the central axis O of the drive shaft 9 (that is, the direction in which the drive shaft 9 extends)
- the radial direction means the direction along a straight line orthogonal to the central axis O
- the circumferential direction It means the direction around the central axis O.
- the drive shaft 9 extends through the sheath 4, the outer tube 5 and the inner tube 6 to the inside of the hub 8.
- the hub 8 , the inner tube 6 , the drive shaft 9 , the housing 10 , and the signal transmitter/receiver 11 are connected to each other so as to be axially movable integrally with respect to the sheath 4 and the outer tube 5 . Therefore, for example, when the hub 8 is pushed toward the distal end side, that is, when a pushing operation is performed, the inner tube 6 connected to the hub 8 is pushed into the outer tube 5 and the unit connector 7, and the drive shaft is pushed. 9.
- the housing 10 and the signal transmitting/receiving unit 11, that is, the imaging core 12 advance inside the sheath 4, that is, move to the distal side.
- the inner tube 6 is pulled out from the outer tube 5 and the unit connector 7 as indicated by arrow A1 in FIGS. 1 and 2B.
- Imaging core 12 moves proximally inside sheath 4 as indicated by arrow A2.
- the tip of the inner tube 6 reaches the vicinity of the relay connector 13 when the inner tube 6 is in the most advanced state in which it is pushed to the tip side.
- the signal transmitter/receiver 11 is positioned at the distal end of the sheath 4 (near the distal end surface of the lumen of the sheath 4).
- a relay connector 13 connects the sheath 4 and the outer tube 5 .
- the distal end of the inner tube 6 is provided with a locking portion 14 for preventing it from slipping off.
- the locking portion 14 prevents the inner tube 6 from slipping out of the outer tube 5 .
- the locking portion 14 is formed on the inner wall of the unit connector 7 when the hub 8 is pulled most proximally, that is, when the inner tube 6 is most pulled out from the outer tube 5 and the unit connector 7 . It is configured to hook into place.
- the drive shaft 9 is an elongated hollow member, in which an electric signal line (electric cable) 15 and an optical signal line (optical fiber) 16 connected to the signal transmitter/receiver 11 are provided. are placed.
- the drive shaft 9 is formed of a coil shaft. Although illustration is omitted, the coil shaft can be formed of, for example, multiple layers of coils with different winding directions. Each coil is made of metal such as stainless steel or Ni--Ti (nickel-titanium) alloy.
- the signal transmission/reception unit 11 has an ultrasonic transmission/reception unit 11a that transmits/receives ultrasonic waves and an optical transmission/reception unit 11b that transmits/receives light.
- the ultrasonic transmission/reception unit 11a has a transducer that transmits ultrasonic waves based on pulse signals into the body cavity and receives ultrasonic waves that have been reflected from living tissue in the body cavity.
- the vibrator is electrically connected via an electrical signal line 15 to an electrical connector 15a (see FIG. 4).
- the vibrator can be made of, for example, a piezoelectric material such as ceramics or crystal.
- the light transmitting/receiving unit 11b has an optical element that transmits light into the body cavity and receives light reflected from the living tissue within the body cavity.
- the optical element is optically connected via an optical signal line 16 to an optical connector 16a (see FIG. 4).
- the optical element can be formed by a lens, such as a ball lens, for example.
- the signal transmitter/receiver 11 is housed inside the housing 10 .
- a proximal end of the housing 10 is fixed to a distal end of the drive shaft 9 .
- the housing 10 is formed of a metal cylindrical tube, and is provided with an opening 10a in its peripheral surface so as not to hinder the progress of signals transmitted and received by the signal transmitter/receiver 11 .
- the housing 10 can be formed by laser processing or the like, for example. It should be noted that the housing 10 may be formed by cutting a metal block or by MIM (metal powder injection molding).
- a tip member 17 is provided at the tip of the housing 10 .
- the tip member 17 has a substantially hemispherical outer shape, thereby suppressing friction and catching with the inner surface of the sheath 4 .
- it is good also as a structure which does not provide the front-end
- the sheath 4 has a lumen 4a into which the drive shaft 9 is inserted so as to be advanced and retracted.
- a tubular guide wire insertion member 18 through which a guide wire can be passed is attached to the distal end of the sheath 4 so as to be offset from the axial center of the lumen of the sheath 4 .
- the sheath 4 and the guide wire insertion member 18 are joined by welding or the like.
- the guidewire insertion member 18 is provided with a marker 19 having X-ray imaging properties.
- the marker 19 is composed of a metal pipe such as Pt, Au, or the like, which is highly opaque to X-rays.
- a communicating hole 20 is formed at the distal end of the sheath 4 to communicate the inside and the outside of the lumen 4a.
- a reinforcing member 21 that is joined to the guide wire inserting member 18 is provided at the distal end of the lumen 4 a of the sheath 4 .
- a through hole is formed in the reinforcing member 21 to allow the communication hole 20 to communicate with the inner lumen 4 a arranged on the proximal side of the reinforcing member 21 . Note that the reinforcing member 21 may not be provided at the distal end of the sheath 4 .
- the communication hole 20 is a priming liquid discharge hole for discharging the priming liquid.
- the priming liquid is released from the communication hole 20 to the outside during the priming process of filling the sheath 4 with the priming liquid, and the priming liquid and gas such as air are introduced into the sheath 4. can be discharged from the inside of the priming liquid and gas such as air.
- the sheath 4, the guide wire insertion member 18, and the reinforcing member 21 are made of a material having flexibility, and the material is not particularly limited, and examples include styrene, polyolefin, polyurethane, polyester, polyamide, Polyimide-based, polybutadiene-based, trans-polyisoprene-based, fluororubber-based, chlorinated polyethylene-based, and other thermoplastic elastomers, etc., and combinations of one or more of these (polymer alloys, polymer blends, , laminates, etc.) can also be used.
- the hub 8 includes a hub body 8a which has a tubular shape coaxial with the inner tube 6 and is detachably attached to the external device 2, and a hub body 8a protruding radially outward from the hub body 8a.
- a port 8b that communicates with the inside of the drive shaft 9;
- a connecting pipe 8c that is integrally attached to the outer peripheral surface of the drive shaft 9;
- a bearing 8d that rotatably supports the connecting pipe 8c;
- It includes a seal member (first seal member 8e) for preventing the priming liquid from leaking sideways, an electrical connector 15a and an optical connector 16a, and is detachably and integrally attached to the first driving section 2a of the external device 2.
- a connector portion 8f The connector portion 8f can rotate integrally with the connection pipe 8c and the drive shaft 9. As shown in FIG.
- the proximal end of the inner tube 6 is integrally connected to the distal end of the hub body 8a.
- the drive shaft 9 is pulled out from the inner tube 6 inside the hub body 8a.
- the port 8b is connected to an injection device 22 for injecting a priming solution during priming.
- the injection device 22 has a connector 22a connected to the port 8b and a syringe (not shown) connected to the connector 22a via a tube 22b. Priming is normally done in the most retracted state (see Figures 1 and 5A).
- the external device 2 comprises a first drive section 2a for rotationally driving the drive shaft 9, a second drive section 2b for moving the drive shaft 9 in the axial direction (i.e. for push/pullback operations), have.
- the first drive section 2a can be configured by, for example, an electric motor.
- the second drive section 2b can be configured by, for example, an electric motor and a linear motion conversion mechanism.
- the linear motion conversion mechanism can convert rotary motion into linear motion, and can be composed of, for example, a ball screw, a rack and pinion mechanism, or the like.
- the operations of the first drive section 2a and the second drive section 2b are controlled by a control device 2c electrically connected thereto.
- the control device 2c includes a CPU (Central Processing Unit) and memory.
- the control device 2c is electrically connected to the display 2d.
- the signal received by the ultrasonic transmission/reception unit 11a is transmitted to the control device 2c via the electrical connector 15a, subjected to predetermined processing, and displayed as an image on the display 2d.
- the signal received by the optical transmitter/receiver 11b is transmitted to the controller 2c through the optical connector 16a, subjected to predetermined processing, and displayed as an image on the display 2d.
- the sheath 4 is inserted into the body cavity, and the imaging core 12 is rotationally driven at a constant rotation speed of about 1000 to 10000 rpm by the first driving section 2a of the external device 2.
- the imaging core 12 is retracted at a constant speed within the lumen 4a of the sheath 4 by the pullback operation by the driving portion 2b.
- the control device 2 c of the external device 2 causes the signal transmission/reception unit 11 to transmit and receive signals. Based on the signal received by scanning by rotating and retreating this signal, the state of the tissue around the body cavity is displayed as an image on the display 2d.
- the diagnostic imaging catheter 1 has a pull-back mechanism 23 at its proximal portion that changes the relative position between the sheath 4 and the drive shaft 9 in order to continuously observe the internal cross section of the body cavity.
- the pullback mechanism 23 is provided radially inward of the outer tube 5 and radially outward of the drive shaft 9 and relatively to the outer tube 5 .
- an inner tube 6 axially movable integrally with the drive shaft 9;
- a first support tube 24 provided radially inside the inner tube 6 and radially outside the drive shaft 9; It has a spacer 25 that integrally connects the first support tube 24 , a relay connector 13 , and a unit connector 7 .
- the relay connector 13 is integrally connected to the sheath 4 and the inner tube 6 is integrally connected to the hub 8 .
- the unit connector 7 is provided with a seal member (second seal member 7a) that prevents the priming liquid from leaking from between the unit connector 7 and the inner tube 6 toward the base end side.
- a locking portion 14 is provided at the tip of the inner tube 6 .
- the engaging portion 14 is configured by an enlarged diameter portion formed by enlarging the outer peripheral surface of the inner tube 6 , and the rear end surface of the engaging portion 14 protrudes radially outward from the outer peripheral surface of the inner tube 6 and It forms an annular shape centered on .
- the unit connector 7 has a stopper surface 7b that abuts against the rear end surface of the locking portion 14 to restrict further retraction of the inner tube 6. As shown in FIG.
- the inner tube 6 has a diameter dimension sufficient to give the locking portion 14 sufficient strength as a stopper.
- the pullback mechanism 23 is provided radially inward of the inner tube 6 and radially outward of the drive shaft 9 , and is relatively to the outer tube 5 and the first support tube 24 and to the drive shaft 9 . and a second support tube 26 axially movable integrally with the inner tube 6 . Further, in this embodiment, the second support tube 26 is provided radially outside the first support tube 24 . A second support tube 26 is integrally connected to the hub 8 and/or the inner tube 6 .
- the structure for integrally connecting the second support tube 26 to the hub 8 is not particularly limited. It may be a structure that The structure for integrally connecting the second support tube 26 to the inner tube 6 is not particularly limited. It may be a structure in which it is adhered to the inner tube 6 with an adhesive or the like through an adhesive. For example, a structure in which a projection 26a (see two-dot chain line in FIG. 5B) projecting radially outward is provided on a part of the outer wall of the second support tube 26, and the projection 26a and the inner wall of the inner tube 6 are bonded. may be The protruding portion 26a may be provided only partially in the circumferential direction, or may be provided over the entire circumference.
- the coaxiality of the second support tube 26 can be easily ensured. Therefore, when the second support tube 26 advances or retreats, it is possible to reduce the possibility of contact with the first support tube 24 and hindering smooth advancement or retreat.
- a structure may be employed in which a flange-shaped member is integrally connected to the proximal end of the second support tube 26 and this flange-shaped member is sandwiched between the proximal end of the inner tube 6 and the hub 8 and fixed.
- the outer peripheral surface of the second support tube 26 may be connected to the inner peripheral surface of the inner tube 6 via one or more ribs extending in the axial direction. 6 may be integrally formed.
- the outer tube 5, the first support tube 24, the inner tube 6, the drive shaft 9 and the second support tube 26 are provided coaxially and have a common central axis O.
- the relay connector 13 has a cylindrical shape, and has a cylindrical inner peripheral surface 13a and a cylindrical inner peripheral surface 13a connected to the tip of the proximal inner peripheral surface 13a via an annular stepped portion 13b. and a distal end side inner peripheral surface 13c.
- the outer peripheral surface of the proximal end of the sheath 4 is joined to the distal inner peripheral surface 13c by welding or the like.
- the outer peripheral surface of the distal end portion of the outer tube 5 is joined to the base end side inner peripheral surface 13a by welding or the like.
- the spacer 25 has a cylindrical shape, the outer peripheral surface of the spacer 25 is in contact with the inner peripheral surface of the distal end of the outer tube 5, and the inner peripheral surface of the spacer 25 is in contact with the outer peripheral surface of the distal end of the first support tube 24. ing.
- the outer peripheral surface of the spacer 25 is joined to the inner peripheral surface of the tip of the outer tube 5 by welding or the like, and the inner peripheral surface of the spacer 25 is joined to the outer peripheral surface of the tip of the first support tube 24 by welding or the like.
- the spacer 25 is made of synthetic resin or metal, for example.
- the first support tube 24 can be formed of, for example, a single-layer or multiple-layer coil or tube.
- the first support tube 24 is made of synthetic resin or metal, for example.
- the use of the coiled first support tube 24 allows the priming liquid to pass radially through the first support tube 24 , thus facilitating priming within the outer tube 5 .
- the first support tube 24 may be formed in a tubular shape having a notch such as a mesh shape, wholly or partially. You may form the 1st support tube 24 in the tubular shape which does not have a notch. In this case, in order to promote priming inside the outer tube 5, it is preferable to provide the spacer 25 with a channel through which the priming liquid passes.
- the second support tube 26 can be formed of, for example, a single-layer or multiple-layer coil or tube.
- the second support tube 26 is made of synthetic resin or metal, for example.
- the use of the coiled second support tube 26 facilitates priming within the inner tube 6 by allowing the priming liquid to pass radially through the second support tube 26 .
- the second support tube 26 may be formed in a tubular shape having a notch such as a mesh shape, wholly or partially.
- the second support tube 26 may be formed in a tubular shape without notches.
- the proximal end of the second support tube 26 is connected to the hub 8 or the inner tube 6 via a member that forms a flow path for passing the priming liquid. preferably.
- the drive shaft 9 is supported from the radially outer side by the first support tube 24 so that the drive shaft 9 does not buckle within the outer tube 5 (for example, as indicated by the two-dot chain line in FIG. 5A).
- the drive shaft 9 is prevented from buckling inside the inner tube 6 (for example, as indicated by the two-dot chain line in FIG. 5A). can be suppressed. Therefore, the drive shaft 9 is rotationally driven in a buckled state within the pull-back mechanism 23, and it is possible to prevent the drive shaft 9 from being twisted and broken.
- the second support tube 26 is arranged in the most advanced state in which the inner tube 6 is pushed into the outer tube 5 to the maximum extent when viewed in the radial direction. It is preferable that the second support tube 26 overlaps with the tube 24. As in the present embodiment, the second support tube 26 is the first support when viewed in the radial direction even in the most retracted state in which the inner tube 6 is pulled out of the outer tube 5 to the maximum. More preferably, it overlaps with the tube 24 .
- the length of the second support tube 26 can be set within a range that does not hinder the expansion and contraction of the pullback mechanism 23 . For example, as in the modification shown in FIG.
- the second support tube 26 is provided outside the first support tube 24 in the radial direction, so that the inner diameter of the second support tube is larger than that of the first support tube.
- Buckling of the shaft 9 can be suppressed step by step from the proximal side toward the distal side. This stepwise suppression of buckling of the drive shaft 9 can more effectively suppress the occurrence of breakage.
- the second support tube 26 may be provided radially inside the first support tube 24 . That is, in this modification, the second support tube 26, the first support tube 24, the inner tube 6, and the outer tube 5 are provided in this order from the drive shaft 9 toward the outside in the radial direction.
- the proximal end of the second support tube 26 can be integrally connected to the hub 8 and/or the inner tube 6 directly or via another member with an adhesive or the like.
- the drive shaft 9 may buckle and break along with the first support tube 24 or the second support tube 26. Buckling is most likely to occur inside the outer tube 5 where the space for buckling is the largest. If the second support tube 26 is located radially inward of the first support tube 24, the inner diameter of the second support tube 26 is kept small while the outer diameter of the first support tube 24 is increased (that is, the first support tube 24) to increase rigidity inside the outer tube 5. Therefore, it is possible to suppress the drive shaft 9 from buckling and breaking inside the outer tube 5 together with the first support tube 24 .
- the first support tube 24 does not overlap with the inner tube 6 when viewed in the radial direction when the inner tube 6 is pulled out from the outer tube 5 to the maximum. good too. That is, in this modified example, the proximal end of the first support tube 24 is located on the distal side relative to the distal end of the inner tube 6 in the most retracted state. 7A, in which the first support tube 24 overlaps with the inner tube 6 in the radial direction when the first support tube 24 is retracted, the priming process is performed in the most retracted state. In addition, it is possible to easily secure a large flow passage cross-sectional area at the proximal end of the priming flow passage formed radially outward of the first support tube 24 .
- the priming liquid is poured into the cavity surrounded by the inner peripheral surface of the outer tube 5 and the outer peripheral surface of the first support tube 24, which is the largest cavity in the hand portion, as indicated by the white arrow in FIG. It can be easily introduced from the proximal end side, and as a result, priming inside the outer tube 5 can be promoted.
- the second support tube 26 may be radially outward of the first support tube 24.
- the configuration on the inner side is preferable because it is easier to obtain the above priming promotion effect.
- the first support tube 24 may be configured so that it does not overlap the second support tube 26 when viewed in the radial direction when the first support tube 24 is in the most retracted state.
- a configuration that overlaps with the second support tube 26 when viewed in the radial direction is preferable because priming inside the first support tube 24 can be promoted.
- the first support tube 24 prevent the drive shaft 9 from buckling inside the outer tube 5 during the pushing operation, but also the drive shaft
- the second support tube 26 can also prevent the 9 from buckling inside the inner tube 6 . Therefore, the drive shaft 9 is rotationally driven in a buckled state within the pull-back mechanism 23, and it is possible to prevent the drive shaft 9 from being twisted and broken.
- the diagnostic imaging catheter 1 according to the embodiment described above can be modified in various ways, for example, as described below.
- the diagnostic imaging catheter 1 includes the outer tube 5, the first support tube 24 provided radially inward of the outer tube 5, and the drive tube 24 provided radially inward of the first support tube 24. a shaft 9; an inner tube 6 provided radially inside the outer tube 5 and radially outside the first support tube 24; and a second support tube 26 which is axially movable relative to the outer tube 5 and the first support tube 24 and integrally with the drive shaft 9 and the inner tube 6.
- the tip of the first support tube 24 may be directly and integrally connected to the relay connector 13 or the outer tube 5 with an adhesive or the like.
- the pull-back mechanism 23 is not limited to the configuration in which the outer tube 5 is integrally connected to the relay connector 13 and the inner tube 6 is integrally connected to the hub 8 . may be integrally connected to the relay connector 13 .
- the diagnostic imaging catheter 1 is not limited to a dual type that uses both IVUS and OCT, and may be a type that uses only IVUS or only OCT.
- the diagnostic imaging catheter 1 when the second support tube 26 is in the most advanced state in which the inner tube 6 is pushed most into the outer tube 5, the first support tube 24 It is preferable that the diagnostic imaging catheter 1 overlaps with .
- the second support tube 26 overlaps the first support tube 24 when viewed in the radial direction even in the most retracted state in which the inner tube 6 is pulled out of the outer tube 5 to the maximum. It is preferable that the catheter 1 for diagnostic imaging is used.
- the diagnostic imaging catheter 1 is preferably the diagnostic imaging catheter 1 in which the second support tube 26 is provided radially outside the first support tube 24 .
- the diagnostic imaging catheter 1 is the diagnostic imaging catheter 1 having the hub 8 connected to the proximal end of the inner tube 6, and the second support tube 26 is integrally connected to the hub 8 or the inner tube 6. is preferred.
- the diagnostic imaging catheter 1 is also preferably the diagnostic imaging catheter 1 in which the second support tube 26 is provided radially inside the first support tube 24 .
- the diagnostic imaging catheter 1 preferably has a hub 8 connected to the proximal end portion of the inner tube 6 and is a diagnostic imaging catheter 1 in which the second support tube 26 is integrally connected to the hub 8 .
- the diagnostic imaging catheter 1 is preferably the diagnostic imaging catheter 1 in which the second support tube 26 is coiled.
- the first support tube 24 is in the most retracted state in which the inner tube 6 is most pulled out of the outer tube 5, and the image does not overlap the inner tube 6 when viewed in the radial direction. It is preferably a diagnostic catheter 1 .
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Abstract
Description
2 外部装置
2a 第1駆動部
2b 第2駆動部
2c 制御装置
2d ディスプレイ
3 画像診断装置
4 シース
4a シースの内腔
5 外管
6 内管
7 ユニットコネクタ
7a 第2シール部材
7b ストッパ面
8 ハブ
8a ハブ本体
8b ポート
8c 接続パイプ
8d 軸受
8e 第1シール部材
8f コネクタ部
9 駆動シャフト
10 ハウジング
10a 開口部
11 信号送受信部
11a 超音波送受信部
11b 光送受信部
12 イメージングコア
13 中継コネクタ
13a 基端側内周面
13b 段部
13c 先端側内周面
14 係止部
15 電気信号線
15a 電気コネクタ
16 光信号線
16a 光コネクタ
17 先端部材
18 ガイドワイヤ挿通部材
19 マーカ
20 連通孔
21 補強部材
22 注入デバイス
22a コネクタ
22b チューブ
23 プルバック機構
24 第1サポートチューブ
25 スペーサ
26 第2サポートチューブ
26a 突起部
O 中心軸線
Claims (9)
- 外管と、前記外管よりも径方向内側に設けられる第1サポートチューブと、前記第1サポートチューブよりも径方向内側に設けられる駆動シャフトと、前記外管よりも径方向内側且つ前記第1サポートチューブよりも径方向外側に設けられる内管と、前記内管よりも径方向内側且つ前記駆動シャフトよりも径方向外側に設けられるとともに前記外管及び前記第1サポートチューブに対して相対的に且つ前記駆動シャフト及び前記内管と一体に軸方向に移動可能な第2サポートチューブと、を有する画像診断用カテーテル。
- 前記第2サポートチューブが、前記内管が前記外管内に最も押し込まれた最前進状態で、径方向に見て前記第1サポートチューブと重複する、請求項1に記載の画像診断用カテーテル。
- 前記第2サポートチューブが、前記内管が前記外管内から最も引き出された最後退状態でも、径方向に見て前記第1サポートチューブと重複する、請求項2に記載の画像診断用カテーテル。
- 前記第2サポートチューブが前記第1サポートチューブよりも径方向外側に設けられる、請求項1~3の何れか1項に記載の画像診断用カテーテル。
- 前記内管の基端部に連なるハブを有し、
前記第2サポートチューブが前記ハブ又は前記内管に一体に接続される、請求項4に記載の画像診断用カテーテル。 - 前記第2サポートチューブが前記第1サポートチューブよりも径方向内側に設けられる、請求項1~3の何れか1項に記載の画像診断用カテーテル。
- 前記内管の基端部に連なるハブを有し、
前記第2サポートチューブが前記ハブに一体に接続される、請求項6に記載の画像診断用カテーテル。 - 前記第2サポートチューブがコイル状である、請求項1~7の何れか1項に記載の画像診断用カテーテル。
- 前記第1サポートチューブが、前記内管が前記外管内から最も引き出された最後退状態で、径方向に見て前記内管と重複しない、請求項1~8の何れか1項に記載の画像診断用カテーテル。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN202280052995.9A CN117715594A (zh) | 2021-07-30 | 2022-07-28 | 图像诊断用导管 |
EP22849600.6A EP4364672A4 (en) | 2021-07-30 | 2022-07-28 | Catheter for diagnostic imaging |
JP2023538629A JPWO2023008539A1 (ja) | 2021-07-30 | 2022-07-28 | |
US18/421,217 US20240156347A1 (en) | 2021-07-30 | 2024-01-24 | Image diagnosis catheter |
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JP2021126235 | 2021-07-30 | ||
JP2021-126235 | 2021-07-30 |
Related Child Applications (1)
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US18/421,217 Continuation US20240156347A1 (en) | 2021-07-30 | 2024-01-24 | Image diagnosis catheter |
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WO2023008539A1 true WO2023008539A1 (ja) | 2023-02-02 |
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PCT/JP2022/029205 WO2023008539A1 (ja) | 2021-07-30 | 2022-07-28 | 画像診断用カテーテル |
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Country | Link |
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US (1) | US20240156347A1 (ja) |
EP (1) | EP4364672A4 (ja) |
JP (1) | JPWO2023008539A1 (ja) |
CN (1) | CN117715594A (ja) |
WO (1) | WO2023008539A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2025126755A1 (ja) * | 2023-12-11 | 2025-06-19 | テルモ株式会社 | 画像診断用カテーテル |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4672188A (en) | 1985-08-05 | 1987-06-09 | International Business Machines Corporation | Focus detector for optical apparatus |
JP2011072680A (ja) * | 2009-09-30 | 2011-04-14 | Terumo Corp | 画像診断用カテーテル |
JP4672188B2 (ja) | 2001-06-08 | 2011-04-20 | テルモ株式会社 | 超音波カテーテル |
JP2011152274A (ja) * | 2010-01-27 | 2011-08-11 | Terumo Corp | 生体内診断装置およびその制御方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2823767B1 (en) * | 2012-03-09 | 2018-04-25 | Terumo Kabushiki Kaisha | Catheter |
JP6247160B2 (ja) * | 2014-06-12 | 2017-12-13 | テルモ株式会社 | 医療用デバイス |
-
2022
- 2022-07-28 EP EP22849600.6A patent/EP4364672A4/en active Pending
- 2022-07-28 JP JP2023538629A patent/JPWO2023008539A1/ja active Pending
- 2022-07-28 CN CN202280052995.9A patent/CN117715594A/zh active Pending
- 2022-07-28 WO PCT/JP2022/029205 patent/WO2023008539A1/ja active Application Filing
-
2024
- 2024-01-24 US US18/421,217 patent/US20240156347A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4672188A (en) | 1985-08-05 | 1987-06-09 | International Business Machines Corporation | Focus detector for optical apparatus |
JP4672188B2 (ja) | 2001-06-08 | 2011-04-20 | テルモ株式会社 | 超音波カテーテル |
JP2011072680A (ja) * | 2009-09-30 | 2011-04-14 | Terumo Corp | 画像診断用カテーテル |
JP2011152274A (ja) * | 2010-01-27 | 2011-08-11 | Terumo Corp | 生体内診断装置およびその制御方法 |
Non-Patent Citations (1)
Title |
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See also references of EP4364672A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2025126755A1 (ja) * | 2023-12-11 | 2025-06-19 | テルモ株式会社 | 画像診断用カテーテル |
Also Published As
Publication number | Publication date |
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EP4364672A4 (en) | 2024-10-30 |
EP4364672A1 (en) | 2024-05-08 |
US20240156347A1 (en) | 2024-05-16 |
JPWO2023008539A1 (ja) | 2023-02-02 |
CN117715594A (zh) | 2024-03-15 |
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