WO2019188916A1 - 医療デバイス及び処置方法 - Google Patents
医療デバイス及び処置方法 Download PDFInfo
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- WO2019188916A1 WO2019188916A1 PCT/JP2019/012383 JP2019012383W WO2019188916A1 WO 2019188916 A1 WO2019188916 A1 WO 2019188916A1 JP 2019012383 W JP2019012383 W JP 2019012383W WO 2019188916 A1 WO2019188916 A1 WO 2019188916A1
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- gripping
- expansion body
- medical device
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- expansion
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Definitions
- the present invention relates to a medical device including a maintenance treatment element that applies energy to a living tissue, and a treatment method that applies energy to the living tissue.
- Chronic heart failure is known as one of heart diseases. Chronic heart failure is roughly classified into systolic and diastolic dysfunctions based on cardiac function indicators. In patients suffering from diastolic dysfunction, the myocardium is enlarged and stiffness is increased, so that the blood pressure of the left atrium increases and the pump function of the heart decreases. As a result, the patient exhibits heart failure symptoms such as pulmonary edema. In addition, there is a heart disease in which the right atrium side blood pressure increases due to pulmonary hypertension or the like, and the heart's pump function is lowered, thereby causing heart failure symptoms.
- a shunt treatment that forms a shunt (through-hole), which serves as an escape route for the increased atrial pressure, in the atrial septum has been attracting attention.
- the shunt treatment accesses the atrial septum with a transvenous approach and forms a through hole of the desired size.
- a medical device for performing a shunt treatment for such an atrial septum there is a device as disclosed in Patent Document 1, for example.
- the medical device of Patent Document 1 enlarges the shunt hole with a balloon that is an expansion body provided at the tip of the shaft portion, and maintains the shunt hole with an electrode provided in the balloon.
- this medical device cannot expand the shunt hole in a state where a maintenance treatment element such as an electrode is fixed to the living tissue. Therefore, during expansion, there is a possibility that the maintenance treatment element and the living tissue are misaligned, thereby reducing the therapeutic effect.
- the present invention has been made in order to solve the above-described problems, and provides a medical device and a treatment method capable of suppressing misalignment between an expanded body and a living tissue and accurately applying energy to a target site. For the purpose.
- a medical device that achieves the above object has a long shaft portion and an expansion body that is provided at a distal end portion of the shaft portion and can be expanded and contracted in a radial direction.
- a gripping portion having a proximal gripping portion and a distal gripping portion, and a movable portion that opens and closes the gripping portion in the gripping direction.
- a treatment method according to the present invention that achieves the above object is a treatment method for expanding a through-hole of a living tissue using a medical device having an expandable body that can be expanded and contracted in the radial direction. Positioning in the through hole of the biological tissue, gripping the biological tissue from both sides of the through hole by the gripping part, expanding the expansion body to increase the diameter of the through hole, and gripping Performing a maintenance procedure using a maintenance procedure element included in the unit.
- the medical device configured as described above grips the living tissue from both sides by the gripper that can be opened and closed in the gripping direction, it is possible to suppress the displacement of the expansion body.
- the energy is accurately applied to the target site while suppressing the displacement of the maintenance treatment element. Can be granted.
- FIG. 6 is an explanatory diagram schematically showing a state in which the atrial septum is grasped by the expansion body of the medical device according to the second embodiment, the living tissue is a cross-sectional view, and the medical device is a front view.
- It is a flowchart of the treatment method by the medical device of 2nd Embodiment. It is a top view which shows the modification of a movable part. It is an enlarged front view which shows the other modification of a movable part. It is an enlarged front view which shows the example of the movable part comprised with the parallel displacement part. It is an enlarged front view of the expansion body vicinity which concerns on a modification.
- the side of the medical device 10 to be inserted into the living body lumen is referred to as “tip” or “tip side”, and the proximal side for operation is referred to as “base end” or “base end side”.
- the medical device in the following embodiments can perform a maintenance procedure for expanding the through hole Hh formed in the atrial septum HA of the patient's heart H and maintaining the expanded through hole Hh in its size. It is configured.
- the medical device 10 includes a long shaft portion 20, an expansion body 21 provided at the distal end portion of the shaft portion 20, and an operation portion provided at the proximal end portion of the shaft portion 20. 23.
- the expansion body 21 is provided with a maintenance treatment element (energy transmission element) 22 for performing the above-described maintenance treatment.
- the shaft portion 20 includes an outer shaft 31 that holds the expansion body 21 at the distal end portion, and a storage sheath 30 that stores the outer shaft 31.
- the storage sheath 30 can move back and forth in the axial direction with respect to the outer shaft 31.
- the storage sheath 30 can store the expansion body 21 in a contracted state therein while being moved to the distal end side of the shaft portion 20.
- the expansion body 21 can be exposed by moving the storage sheath 30 to the proximal end side from the state where the expansion body 21 is stored.
- the traction shaft 33 is housed inside the outer shaft 31.
- the traction shaft 33 protrudes from the distal end of the outer shaft 31 to the distal end side, and the distal end portion is fixed to the distal end member 35.
- the base end portion of the traction shaft 33 is led out to the base end side from the operation portion 23.
- the tip member 35 to which the tip portion of the traction shaft 33 is fixed may not be fixed to the expansion body 21. Thereby, the tip member 35 can pull the expansion body 21 in the compression direction. Further, when the expansion body 21 is stored in the storage sheath 30, by moving the distal end member 35 away from the expansion body 21 toward the distal end side, the expansion body 21 can be easily moved in the extending direction, and the storage performance can be improved. it can.
- the operation unit 23 includes a housing 40 held by the surgeon, an operation dial 41 that can be rotated by the surgeon, and a conversion mechanism 42 that operates in conjunction with the rotation of the operation dial 41.
- the traction shaft 33 is held by the conversion mechanism 42 inside the operation unit 23.
- the conversion mechanism 42 can move the traction shaft 33 to be held back and forth along the axial direction.
- a rack and pinion mechanism can be used as the conversion mechanism 42.
- the expansion body 21 has a plurality of wires in the circumferential direction.
- four wire rods of the expansion body 21 are provided in the circumferential direction, and can be expanded and contracted in the radial direction.
- the wire rod of the expansion body 21 includes a proximal end side extended portion 56 extending in the diameter increasing direction from the proximal end portion toward the distal end side, and a distal end side extending portion 57 extending in the diameter increasing direction from the distal end portion toward the proximal end side.
- a proximal end side extended portion 56 extending in the diameter increasing direction from the proximal end portion toward the distal end side
- a distal end side extending portion 57 extending in the diameter increasing direction from the distal end portion toward the proximal end side.
- a proximal end side gripping portion 51 a is provided at the distal end portion of the proximal end side extension portion 56, and a distal end side gripping portion 51 b is provided at the proximal end portion of the distal end side extension portion 57.
- a grasping portion 51 capable of grasping a living tissue is formed by the grasping portion 51b.
- the base end portion of the base end side expansion portion 56 is fixed to the distal end portion of the outer shaft 31.
- the distal end portion 55 of the distal end side expansion portion 57 is located on the proximal end side with respect to the distal end member 35 as the expansion body 21 self-expands.
- a base portion side gripping portion 51 a and a tip end side gripping portion 51 b that face each other in the axial direction, and a movable portion 52 that connects them are provided with a concave portion 53.
- the movable part 52 has a bent part 54 having a smaller diameter than the grip part 51.
- the bent portion 54 has a smaller diameter than the grip portion 51, and therefore has a lower bending strength than the grip portion 51. For this reason, the bending part 54 is easy to bend at the time of expansion of the expansion body 21, and can open and close the holding part 51 in a fan shape.
- the wire forming the expanded body 21 has, for example, a flat plate shape cut out from a cylinder.
- the wire forming the expanded body 21 can have a thickness of 50 to 500 ⁇ m and a width of 0.3 to 2.0 mm. However, it may have dimensions outside this range.
- the wire may have a circular cross-sectional shape or other cross-sectional shape.
- the maintenance treatment element 22 is provided in the proximal end side grip part 51a.
- the proximal end grasping part 51a When the grasping part 51 grasps the atrial septum HA, the proximal end grasping part 51a is located on the right atrial side, so that the energy from the maintenance treatment element 22 is from the right atrial side with respect to the atrial septum HA. Communicated.
- the maintenance treatment element 22 may be provided in the distal end side grip portion 51b, or may be provided in both the proximal end side grip portion 51a and the distal end side grip portion 51b. It is desirable that the maintenance treatment element 22 is disposed on a convex portion protruding from the surface of the grip portion 51.
- the maintenance treatment element 22 is composed of, for example, a bipolar electrode that receives electrical energy from an energy supply device (not shown) that is an external device. In this case, energization is performed between the maintenance treatment elements 22 arranged in the grip portion 51.
- the maintenance element 22 and the energy supply device are connected by a conductive wire (not shown) covered with an insulating coating material.
- the conducting wire is led out to the outside through the shaft portion 20 and the operation portion 23 and is connected to the energy supply device.
- the maintenance treatment element 22 may also be configured as a monopolar electrode. In this case, energization is performed between a counter electrode prepared outside the body. Further, the maintenance treatment element 22 may be a heating element (electrode chip) that generates heat by receiving high-frequency electrical energy from the energy supply device. Further, the maintenance treatment element 22 has a heating or cooling action by a microwave energy, an ultrasonic energy, a coherent light such as a laser, a heated fluid, a cooled fluid, a chemical medium, or a frictional heat. In addition, it can be configured by an energy transfer element capable of imparting energy to the through hole Hh, such as a heater provided with an electric wire or the like, and the specific form is not particularly limited.
- the wire forming the expanded body 21 can be formed of a metal material.
- a metal material for example, a titanium-based alloy (Ti—Ni, Ti—Pd, Ti—Nb—Sn, etc.), a copper-based alloy, stainless steel, ⁇ -titanium steel, or a Co—Cr alloy can be used. . It is better to use an alloy having spring properties such as a nickel titanium alloy.
- the material of the expansion body 21 is not limited to these, and may be formed of other materials.
- the shaft portion 20 has an inner shaft 32 inside the outer shaft 31, and a traction shaft 33 is housed inside the inner shaft 32.
- a guide wire lumen is formed in the traction shaft 33 and the tip member 35 along the axial direction, and the guide wire 11 can be inserted therethrough.
- the housing sheath 30, the outer shaft 31, and the inner shaft 32 of the shaft portion 20 are preferably formed of a material having a certain degree of flexibility.
- a material having a certain degree of flexibility include polyolefins such as polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, or a mixture of two or more of these, soft polyvinyl chloride resin, Examples thereof include fluororesins such as polyamide, polyamide elastomer, polyester, polyester elastomer, polyurethane, polytetrafluoroethylene, polyimide, PEEK, silicone rubber, and latex rubber.
- the traction shaft 33 is made of a long wire such as a superelastic alloy such as a nickel-titanium alloy or a copper-zinc alloy, a metal material such as stainless steel, or a resin material having a relatively high rigidity. Further, it can be formed by coating a resin material such as polypropylene or ethylene-propylene copolymer.
- the tip member 35 is, for example, a polymer material such as polyolefin, polyvinyl chloride, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, polyimide, fluororesin, or a mixture thereof, or a multilayer tube of two or more kinds of polymer materials. Can be formed.
- a polymer material such as polyolefin, polyvinyl chloride, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, polyimide, fluororesin, or a mixture thereof, or a multilayer tube of two or more kinds of polymer materials. Can be formed.
- the expanded body 21 exposed to the outside of the storage sheath 30 is expanded in the radial direction by its self-expanding force.
- the concave portion 53 is in a state in which the bent portion 54 is bent and the grip portion 51 is closed in the grip direction from the state in which the grip portion 51 is opened in a fan shape (FIG. 4A) when the expansion body 21 is expanded (FIG. 4 (b)).
- the storage sheath 30 that stores the expansion body 21 in a contracted state is a restricting element that maintains the grip 51 in an open state. By releasing the restriction element, that is, by exposing the expansion body 21 to the outside of the storage sheath 30.
- the grip 51 can be closed in the grip direction.
- the expansion body 21 expands in a state where the concave portion 53 is positioned in the atrial septum HA, so that the atrial septum HA can be grasped from both sides by closing the grasping portion 51 in the grasping direction. it can.
- the distal end member 35 moves to the proximal end side, thereby moving the distal end portion 55 of the expansion body 21 to the proximal end side. Accordingly, the expansion body 21 further expands in the radial direction. From this state, the expansion body 21 can return to the state shown in FIG. 3 by moving the traction shaft 33 toward the distal end side.
- the treatment method of this embodiment is performed with respect to the patient suffering from heart failure (left heart failure) as an example. More specifically, as shown in FIG. 7, for patients suffering from chronic heart failure in which the left ventricular myocardium of the heart H is enlarged and stiffness is increased, thereby increasing the blood pressure of the left atrium HLa. This is the method of treatment performed.
- the surgeon When forming the through hole Hh, the surgeon delivers the introducer 210 in which the guiding sheath 211 and the dilator 212 are combined to the vicinity of the atrial septum HA.
- the introducer 210 can be delivered to the right atrium HRa via, for example, the inferior vena cava Iv. Introducer 210 can also be delivered using guidewire 11.
- the surgeon can insert the guide wire 11 through the dilator 212 and deliver the introducer 210 along the guide wire 11.
- the introduction of the introducer 210 and the insertion of the guide wire 11 into the living body can be performed by a known method such as using an introducer for blood vessel introduction.
- step S1-1 the operator penetrates the puncture device 200 from the right atrium HRa side toward the left atrium HLa side to form a through hole Hh.
- a puncture device 200 for example, a device such as a wire with a sharp tip can be used.
- the puncture device 200 is inserted through the dilator 212 and delivered to the atrial septum HA.
- the puncture device 200 can be delivered to the atrial septum HA instead of the guide wire 11 after removing the guide wire 11 from the dilator 212.
- step S1-2 first, as shown in FIG. 9, the medical device 10 is delivered to the vicinity of the atrial septum HA along the guide wire 11 inserted in advance. At this time, the distal end portion of the medical device 10 penetrates the atrial septum HA and reaches the left atrium HLa. In addition, when the medical device 10 is inserted, the expansion body 21 is stored in the storage sheath 30.
- the distal end side portion of the expansion body 21 is exposed in the left atrium HLa by moving the expansion body 21 to the distal end side.
- the front end side expansion part 57 among the expansion bodies 21 expands in the radial direction.
- the distal end side grip 51b of the expansion body 21 is pressed against the surface of the atrial septum HA on the left atrial HLa side. Thereby, positioning of the expansion body 21 is made.
- step S1-3 is performed.
- the movable portion 52 does not expand larger than the outer diameter of the storage sheath 30, and does not substantially expand the through hole Hh.
- the distal end side expanded portion 57 and the proximal end side expanded portion 56 of the expanded body 21 expand in the radial direction, and the movable portion 52 does not expand substantially in the radial direction.
- the atrial septum HA is grasped by the grasping portion 51.
- step S1-4 the operator operates the operation unit 23 while the atrial septum HA is grasped by the grasping unit 51, thereby moving the traction shaft 33 to the proximal end side as shown in FIG. Move.
- the expansion body 21 is further expanded in the radial direction by the tip member 35 provided at the tip of the traction shaft 33.
- the proximal end side extended portion 56, the distal end side extended portion 57, and the movable portion 52 of the expanded body 21 are all expanded in the radial direction.
- the gripped through hole Hh is pushed and expanded in the radial direction. In this manner, by performing an expansion operation in the radial direction in a state where the atrial septum HA is grasped from both sides by the grasping portion 51, the through hole Hh of the atrial septum HA can be effectively expanded.
- hemodynamic confirmation is performed in step S1-5.
- the surgeon delivers the hemodynamic confirmation device 220 to the right atrium HRa via the inferior vena cava Iv.
- the hemodynamic confirmation device 220 for example, a known echo catheter can be used.
- the surgeon can display the echo image acquired by the hemodynamic confirmation device 220 on a display device such as a display, and can confirm the amount of blood passing through the through hole Hh based on the display result.
- the hemodynamics can be confirmed by measuring the pressure at each part.
- the pressure measurement on the left atrium side can be performed through the guide wire lumen of the shaft portion 20, and at the same time, the pressure measurement on the right atrium side can be performed through the gap between the storage sheath 30 and the outer shaft 31.
- the pressure measurement can be performed by connecting a known pressure measuring device to the shaft portion 20.
- step S1-6 the surgeon performs a maintenance procedure to maintain the size of the through hole Hh.
- high-frequency energy is applied to the edge portion of the through-hole Hh through the maintenance treatment element 22 to cauterize the edge portion of the through-hole Hh with high-frequency energy (heating cauterization).
- heat cauterization high-frequency energy
- the living tissue near the edge of the through hole Hh is cauterized through the maintenance treatment element 22
- a denatured portion in which the living tissue is denatured is formed near the edge. Since the living tissue in the denatured portion loses elasticity, the through-hole Hh can maintain the shape when expanded by the expansion body 21.
- the holding part 51 in which the maintenance treatment element 22 is arranged holds the atrial septum HA as described above, and the maintenance treatment is performed in this state. For this reason, it is possible to prevent the displacement of the maintenance treatment element 22 during the maintenance treatment. Further, by adjusting the difference in bending strength between the gripping part 51 and the movable part 52, the pressing force and the contact area of the maintenance treatment element 22 on the living tissue can be controlled. Thereby, the dispersion
- the maintenance treatment element 22 is disposed on the convex portion of the grip portion 51. For this reason, the maintenance treatment is performed in a state where the maintenance treatment element 22 is buried in the living tissue by pressing the grasping portion 51 against the atrial septum HA. Thereby, it is possible to prevent the maintenance treatment element 22 from touching the blood during the maintenance treatment and to prevent a current from leaking into the blood and causing a thrombus or the like.
- step S1-7 After the maintenance treatment, the hemodynamics is confirmed again in step S1-7, and when the amount of blood passing through the through hole Hh is a desired amount, the operator reduces the diameter of the expansion body 21 and stores the storage sheath 30. And then removed from the through hole Hh. Further, the entire medical device 10 is removed from the living body, and the treatment is terminated.
- the medical device 15 of the present embodiment is the same as that of the first embodiment with respect to the configuration other than the expansion body 100, and a description of common parts is omitted.
- the expansion body 100 has a plurality of wires in the circumferential direction, and this wire has a proximal-side extended portion 106, a distal-side extended portion 107, and a movable portion 103.
- the expansion body 100 has a concave portion 104 at the center in the axial direction.
- the concave portion 104 is formed by a grip portion 102 having a proximal end side grip portion 102 a and a distal end side grip portion 102 b and a movable portion 103 provided between the grip portions 102.
- the movable portion 103 is provided with a bent portion 105 having a larger diameter than the grip portion 102 and having a bending strength greater than that of the grip portion 102.
- the expansion body 100 is shaped so that the gripping portion 102 is greatly opened and the movable portion 103 is separated from the traction shaft 33 in the outer diameter direction of the storage sheath 30.
- the expansion body 100 arranged in the through hole Hh of the atrial septum HA has the proximal-side expansion portion 106, the distal-side expansion portion 107, and the movable portion 103 all in the radial direction.
- the diameter of the through hole Hh is expanded. After the diameter of the through hole Hh is expanded, the bent portion 105 is bent and the grip portion 102 is closed in the grip direction as shown in FIG. Grip the HA from both sides.
- the order of expansion and gripping can be changed by changing the balance of the bending strength between the gripping portion 102 and the movable portion 103.
- the expansion operation and the gripping operation of the expansion body can be performed simultaneously by adjusting the balance of the bending strength between the gripping portion and the movable portion.
- the diameter of the through hole Hh can be simultaneously increased while holding the through hole Hh from both sides.
- FIG. 15 A treatment method using the medical device 15 of the present embodiment will be described.
- the steps S2-1 to S2-2 are the same as the steps S1-1 to S1-2 in the first embodiment, and a description thereof will be omitted.
- the treatment method of the present embodiment includes a step (S2-5) of confirming hemodynamics in the vicinity of the through hole Hh after S2-4, a step (S2-6) of determining the necessity for additional expansion, When it is determined in S2-6 that additional expansion is necessary, a step of performing additional expansion of the through hole Hh (S2-7) and a step of performing a maintenance procedure for maintaining the size of the through hole Hh (S2- 8) and a step of confirming hemodynamics in the vicinity of the through-hole Hh after the maintenance treatment is performed (S2-9).
- the steps S2-8 to S2-9 are the same as the steps S1-6 to S1-7 in the first embodiment, and thus description thereof is omitted.
- step S2-2 the expansion body 100 is stored in the storage sheath 30.
- step S ⁇ b> 2-3 the operator moves the storage sheath 30 to the proximal end side to expose the expansion body 100 from the storage sheath 30.
- the expansion body 100 expands the diameter of the through hole Hh by expanding all of the base end side expansion portion 106, the distal end side expansion portion 107 and the movable portion 103 in the radial direction.
- the operator moves the traction shaft 33 to the proximal end side in step S2-4.
- the bent portion 105 of the movable portion 103 is bent and the grip portion 102 is closed in the grip direction.
- the holding part 102 holds the atrial septum HA from both sides.
- step S2-7 additional expansion is performed in the step S2-7. Additional expansion is performed by further increasing the diameter of the expansion body 100 by moving the traction shaft 33 further to the proximal end side in the state of FIG. Further, the traction shaft 33 is moved to the distal end side from the state, the diameter of the expansion body 100 is once reduced, and then the traction shaft 33 is moved again to the proximal end side to increase the diameter of the expansion body 100. it can. Furthermore, the forward and backward movement of the traction shaft 33 can be repeated to push the through hole Hh little by little.
- a pre-expansion step can be performed between S2-2 and S2-3.
- the pre-expansion is performed when the living tissue is so hard that it cannot be sufficiently expanded by the expansion force of the expansion body 100.
- the diameter of the through hole is expanded by expanding the expansion body 100 as in S2-3, and the traction shaft 33 is moved to the proximal side as in S2-4. Grip the HA from both sides.
- the expansion body 100 is further expanded, and the through hole Hh is expanded. By performing this operation once or a plurality of times, the living tissue around the through hole Hh is torn, and the subsequent expansion is enabled.
- the through hole Hh of the atrial septum HA is expanded by the grip portion 102 and then gripped by the grip portion 102.
- the bending strength of the grip portion 102 and the movable portion 103 is increased.
- the expansion and gripping of the through hole Hh may be performed at the same time as the expansion body 100 is expanded.
- the movable part that opens and closes the gripping part can take various forms. As a shape for reducing the bending strength in the bent portion 54, the shape is smaller than that of the grip portion 51 in the first embodiment.
- a slit portion 54a can be provided.
- a notch 54b can be provided.
- the some small hole part 54c can be provided.
- both the slit part 54a and the notch part 54b can be provided.
- a soft portion 54d made of a material softer than the surroundings can be provided.
- a movable part can be formed by providing the part which made thickness thinner than the circumference
- the movable portion 112 may connect the intermediate portions in the length direction of the proximal end side gripping portion 111a and the distal end side gripping portion 111b.
- the movable portion 117 may include a hinge portion 118 that allows the proximal end side gripping portion 116a and the distal end side gripping portion 116b to turn relative to each other.
- the hinge part 118 has a rotating shaft part 118a. A biasing force may be applied to the rotating shaft portion 118a in the direction in which the grip portion 116 is closed. Thereby, the atrial septum HA can be elastically held by the holding part 116.
- the movable portion is not limited to the one that opens and closes the grip portion in a fan shape, and may be a portion that translates along the axial direction of the shaft portion 20.
- the expansion body 120 can be provided with a parallel moving part 122.
- the parallel moving part 122 has an extending part 123 extending from the distal end side gripping part 121b toward the proximal end side gripping part 121a, and the proximal end side gripping part 121a has a slide holding part 124 that holds the extending part 123.
- the extension part 123 can be moved along the axial direction by the slide holding part 124.
- the extension portion 123 can be slid using, for example, a wire (not shown) connected to the extension portion 123 and extending to the hand portion.
- the parallel moving portion 126 may have a structure in which one gripping portion 127 is supported by an elastic body 128 such as a spring.
- the elastic body 128 urges the grip portion 127 in the extending direction, and regulates the urging force using a wire (not shown) connected to the grip portion 127 or the elastic body 128 and extending to the hand portion.
- the contracted expansion body 125 is provided with a lock portion (not shown) in which the urging force of the elastic body 128 is regulated, and the lock portion is released as the expansion body 125 expands in the radial direction. It may be.
- the parallel moving part 131 may have a structure in which one gripping part 132 is supported by a moving balloon 133. As the moving balloon 133 expands and contracts, the grip portion 132 can move along the axial direction. In this case, an additional lumen (not shown) for supplying the expansion fluid to the moving balloon 133 is provided.
- the expansion body may be separated at the proximal end side and the distal end side. As shown in FIG. 19, the expansion body 140 has two independent members, a base end side expansion portion 141 and a distal end side expansion portion 143.
- the proximal end extension portion 141 has a proximal end side gripping portion 142
- the distal end side extension portion 143 has a distal end side gripping portion 144.
- the proximal end side extended portion 141 and the distal end side extended portion 143 are connected by a connecting portion 145 such as a wire.
- the distal end side extended portion 143 moves to the proximal end side by moving the traction shaft 33 to the proximal end side, and the distal end side gripping portion 144 and the proximal end side gripping portion 142 are moved.
- the expansion body can also be formed by a balloon.
- a balloon 150 is provided at the tip of the shaft portion 20.
- the balloon 150 is a high-compliance portion 151 that is flexible and easily expandable in regions on the distal end side and the proximal end side in the axial direction.
- the region in the central portion of the balloon 150 in the axial direction is a low compliance portion 152 that is hard and difficult to expand.
- FIG. 20B When such a balloon 150 is expanded, as shown in FIG. 20B, the portion of the high compliance portion 151 expands and the portion of the low compliance portion 152 does not expand so much.
- each surface of the center side of the high compliance part 151 opposes on both sides of the low compliance part 152.
- the opposing surfaces serve as grip portions 153 and 153 for gripping the living tissue.
- the expansion body may be expanded by the expansion force of the balloon.
- a balloon 160, a proximal end expansion portion 161, and a distal end side expansion portion 163 are provided at the distal end portion of the shaft portion 20.
- the proximal end side expansion portion 161 has a proximal end side gripping portion 162, and the distal end portion thereof is in contact with the balloon 160.
- the distal end side extended portion 163 has a distal end side gripping portion 164, and the distal end portion is in contact with the balloon 160.
- the expansion body may be a combination of a wire rod and a balloon.
- a balloon 172 and a proximal-side expansion portion 170 are provided at the distal end portion of the shaft portion 20.
- the proximal end side extended portion 170 is provided with a proximal end side gripping portion 171.
- the balloon 172 is a low-compliance portion 174 that is hard and difficult to expand in the proximal region, and a high-compliance portion 173 that is flexible and easy to expand in the distal region.
- the portion of the high compliance portion 173 that is easily expanded in the balloon 172 is greatly expanded, and the surface on the base end side is the base of the base end side expansion portion 170. It faces the end side gripping part 171. This portion becomes the distal end side gripping portion 175 that grips the living tissue.
- the distal end side is first expanded, and then the proximal end side is expanded to grasp the atrial septum HA.
- the proximal end side of the expansion body 21 can be expanded first, and then the distal end side can be expanded to grasp the atrial septum HA.
- the storage sheath 30 is moved to the proximal end side while the distal end side of the concave portion 53 is positioned in the through hole Hh in the expansion body 21, and the expansion is performed. The entire body 21 is exposed.
- the expansion body 21 is moved to the distal end side, and the proximal end side gripping portion 51a of the expansion body 21 is pressed against the atrial septum HA.
- the distal end portion of the expansion body 21 enters the left atrium HLa.
- the distal end portion of the expansion body 21 expands in the radial direction, and the atrial septum HA is gripped by the proximal end gripping portion 51a and the distal end gripping portion 51b as shown in FIG. It becomes the state.
- the distal side sheath 36 may be used in a method of grasping the atrial septum HA by expanding the proximal end side of the expansion body 21 first and then expanding the distal end side.
- the shaft portion 20 has a storage sheath 30 and a distal end side sheath 36.
- the distal-side sheath 36 is movable along the axial direction independently of the storage sheath 30.
- the expansion body 21 is housed in the housing sheath 30 on the proximal end side and housed in the distal sheath 36 on the distal end side.
- the shaft portion 20 is inserted until the proximal end portion of the distal end side sheath 36 is located in the through hole Hh.
- the housing sheath 30 is moved to the proximal end side, and the portion on the proximal end side from the concave portion 53 of the expansion body 21 is exposed. Thereby, the part of the base end side rather than the recessed part 53 of the expansion body 21 expands to radial direction.
- the expansion body 21 is moved to the distal end side, and the proximal end side gripping portion 51a of the expansion body 21 is pressed against the atrial septum HA.
- the distal sheath 36 is moved toward the distal end.
- the distal end side portion of the expansion body 21 is also expanded in the radial direction.
- the proximal-side grasping portion 51a and the distal-end-side grasping portion 51b grasp the atrial septum HA.
- the medical device 10 includes the long shaft portion 20 and the expansion body 21 that is provided at the distal end portion of the shaft portion 20 and can be expanded and contracted in the radial direction.
- 21 includes a gripping portion 51 having a proximal-side gripping portion 51a and a distal-end-side gripping portion 51b that grips a living tissue, and a movable portion 52 that opens and closes the gripping portion 51 in the gripping direction.
- the movable portion 52 is provided between the grip portions 51a and 51b on both sides, and if the grip portion 51 is opened and closed in a fan shape, the grip portion 51 can be opened and closed with a simple mechanism.
- the movable portion 52 is a bent portion 54 having a bending strength different from that of the grip portion 51, the grip portion 51 and the movable portion 52 can be formed with a single wire, and a simple structure can be obtained.
- the movable part 117 has the rotating shaft part 118a which makes the grip part 116 mutually rotatable, the movability of the grip part 116 can be increased, and the living tissue can be gripped more reliably by the grip part 116. be able to.
- the movable unit 123 includes the parallel moving unit 126 that moves at least one of the opposing gripping units 127 along the axial direction, the movable unit 123 grips the living tissue by moving the gripping unit 127 in parallel. It can be made easier.
- the shaft portion 20 is connected to the expansion body 21 and has a traction shaft 33 that moves the distal end portion of the expansion body 21 relative to the base end portion of the expansion body 21 in the axial direction, the traction shaft 33 is provided.
- the state of the expansion body can be easily operated.
- the diameter of the expansion body 21 is increased by operating the traction shaft 33.
- the diameter of the through hole Hh can be increased.
- the biological tissue is moved by the gripping portion 51 by the operation of the traction shaft 33. It can be gripped.
- the gripping portion 51 can be held by operating the control element 30.
- the living tissue can be easily grasped by the unit 51.
- the grasping portion 51 has the maintenance treatment element 22 that performs the maintenance treatment on the living tissue
- the maintenance treatment element 22 is arranged on the grasping portion 51 that grasps the living tissue. The positional deviation of 22 can be suppressed.
- the treatment method according to the above-described embodiment is a treatment method for expanding the through-hole Hh of the living tissue using the medical device 10 having the expansion body 21 that can be expanded and contracted in the radial direction.
- the step of grasping the living tissue by the grasping portion 51 is performed before, after, or simultaneously with the step of expanding the expansion body 21 to increase the diameter of the through hole Hh.
- the tissue can be grasped at an arbitrary timing, and the displacement of the expansion body 21 during the maintenance treatment can be suppressed.
- the movable part 52 of the expansion body 21 may be shaped in advance in the direction in which the grip part 51 is closed. In this case, when the storage sheath 30 is moved to the proximal end side and the entire expansion body 21 is exposed to the outside of the storage sheath 30, the movable portion 52 automatically moves toward the closing direction of the grip portion 51 by the shaping. Can be moved. In addition, the pulling shaft 33 can adjust the axial distance between the proximal-side grip 51 and the distal-side grip 51.
- the movable part 52 may be deformed by the elastic force of the biological tissue directed toward the central axis of the medical device 10, whereby the gripping part 51 can be moved to grip the biological tissue.
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Abstract
Description
図1に示すように、本実施形態の医療デバイス10は、長尺なシャフト部20と、シャフト部20の先端部に設けられる拡張体21と、シャフト部20の基端部に設けられる操作部23とを有している。拡張体21には、前述の維持処置を行うための維持処置要素(エネルギー伝達要素)22が設けられる。
医療デバイス10を使用した処置方法について説明する。本実施形態の処置方法は、一例として、心不全(左心不全)に罹患した患者に対して行われる。より具体的には、図7に示すように、心臓Hの左心室の心筋が肥大化してスティッフネス(硬さ)が増すことで、左心房HLaの血圧が高まる慢性心不全に罹患した患者に対して行われる処置の方法である。
次に、第2の実施形態の医療デバイス15について説明する。本実施形態の医療デバイス15は、拡張体100以外の構成については、第1の実施形態と同じであり、共通部分については説明を省略する。図13に示すように、拡張体100は、周方向に複数の線材を有し、この線材は、基端側拡張部106と先端側拡張部107及び可動部103を有している。拡張体100は、軸方向の中央部に凹状部104を有している。凹状部104は、基端側把持部102a及び先端側把持部102bを有する把持部102と、把持部102間に設けられる可動部103とで形成されている。例えば、可動部103には、把持部102より大径状で、把持部102より曲げ強度が大きい曲がり部105が設けられている。このため、拡張体100は、把持部102が大きく開口し、可動部103が牽引シャフト33から収納シース30の外径方向に離れるように形状付けされている。
本実施形態の医療デバイス15を使用した処置方法について説明する。図15に示すように、本実施形態の処置方法は、心房中隔HAに貫通孔Hhを形成するステップ(S2-1)と、貫通孔Hhに拡張体100を配置するステップ(S2-2)と、拡張体100によって貫通孔Hhの径を拡張させるステップ(S2-3)と、拡張体100によって心房中隔HAを把持するステップ(S2-4)と、を有する。ここで、S2-1~S2-2のステップは、第1の実施形態におけるS1-1~S1-2のステップと同様であるので、説明を省略する。
把持部を開閉させる可動部は様々な形態とすることができる。曲がり部54における曲げ強度を小さくするための形状として、第1の実施形態では把持部51より細径状としている。この他にも、図16(a)に示すように、スリット部54aを設けることができる。また、図16(b)に示すように、切欠き部54bを設けることができる。また、図16(c)に示すように、複数の小孔部54cを設けることができる。また、図16(d)に示すように、スリット部54aと切欠き部54bを両方設けることができる。また、図16(e)に示すように、周囲より柔らかい材料で形成された軟質部54dを設けることができる。また、周囲よりも厚みを薄くした部分を設けることで、可動部を形成することができる。
拡張体は、基端側と先端側とで分離していてもよい。図19に示すように、この拡張体140は、基端側拡張部141と先端側拡張部143との2つの独立した部材を有している。基端側拡張部141は基端側把持部142を有し、先端側拡張部143は先端側把持部144を有している。基端側拡張部141と先端側拡張部143は、ワイヤ等の連結部145によって連結されている。この場合に、図中矢印で示すように、牽引シャフト33を基端側に移動させることで、先端側拡張部143は基端側に移動し、先端側把持部144と基端側把持部142との距離が小さくなる。これによって、先端側把持部144と基端側把持部142とで生体組織を把持することができる。
上述の実施形態では、拡張体21を拡張させる際に、まず先端側を拡張させ、その後に基端側を拡張させて心房中隔HAを把持する。これに対し、拡張体21の基端側を先に拡張させ、その後に先端側を拡張させて心房中隔HAを把持することもできる。この場合、図23(a)に示すように、拡張体21のうち、凹状部53のやや先端側を貫通孔Hh内に位置させた状態で、収納シース30を基端側に移動させ、拡張体21の全体を露出させる。これにより、拡張体21の凹状部53より先端側の部分は、貫通孔Hhにより拡張が抑えられ、拡張体21の凹状部53より基端側の部分は、径方向に拡張した状態となる。
11 ガイドワイヤ
20 シャフト部
21 拡張体
22 維持処置要素
23 操作部
30 収納シース
31 アウターシャフト
32 インナーシャフト
33 牽引シャフト
35 先端部材
40 筐体
41 操作ダイヤル
42 変換機構
51 把持部
52 可動部
53 凹状部
54 曲がり部
56 基端側拡張部
57 先端側拡張部
100 拡張体
102 把持部
103 可動部
104 凹状部
105 曲がり部
106 基端側拡張部
107 先端側拡張部
110 拡張体
111 把持部
112 可動部
115 拡張体
116 把持部
117 可動部
118 ヒンジ部
120 拡張体
121 把持部
122 平行移動部
123 延出部
124 スライド保持部
125 拡張体
126 平行移動部
127 把持部
128 弾性体
130 拡張体
131 平行移動部
132 把持部
133 移動用バルーン
140 拡張体
141 基端側拡張部
142 基端側把持部
143 先端側拡張部
144 先端側把持部
145 連結部
150 バルーン
151 高コンプライアンス部
152 低コンプライアンス部
153 把持部
160 バルーン
161 基端側拡張部
162 基端側把持部
163 先端側拡張部
164 先端側把持部
170 基端側拡張部
171 基端側把持部
172 バルーン
173 高コンプライアンス部
174 低コンプライアンス部
175 先端側把持部
200 穿刺デバイス
210 イントロデューサ
211 ガイディングシース
212 ダイレータ
220 血行動態確認用デバイス
Claims (12)
- 長尺なシャフト部と、
前記シャフト部の先端部に設けられ径方向に拡縮可能な拡張体と、を有し、
前記拡張体は、生体組織を把持する基端側把持部及び先端側把持部を有する把持部と、該把持部を把持方向に開閉させる可動部と、を有する医療デバイス。 - 前記可動部は両側の前記把持部の間に設けられ、前記把持部を扇状に開閉させる請求項1に記載の医療デバイス。
- 前記可動部は、前記把持部と曲げ強度が異なる曲がり部である請求項2に記載の医療デバイス。
- 前記可動部は、前記把持部を互いに回動可能とする回転軸部を有する請求項2に記載の医療デバイス。
- 前記可動部は、対向する前記把持部の少なくとも一方を軸方向に沿って移動させる平行移動部を有する請求項1に記載の医療デバイス。
- 前記シャフト部は、前記拡張体に接続され、前記拡張体の先端部を前記拡張体の基端部に対して軸方向に移動させる牽引シャフトを有する請求項1~5のいずれか1項に記載の医療デバイス。
- 前記牽引シャフトにより前記拡張体の先端部が基端部側に移動することで、前記把持部が拡張方向に移動する請求項6に記載の医療デバイス。
- 前記牽引シャフトにより前記拡張体の先端部が基端部側に移動することで、前記把持部が把持方向に閉じる請求項6に記載の医療デバイス。
- 前記把持部を開いた状態に維持する規制要素を有し、該規制要素を解除することで、前記把持部が把持方向に閉じる請求項1~8のいずれか1項に記載の医療デバイス。
- 前記把持部は、生体組織に対して維持処置を行う維持処置要素を有する請求項1~9のいずれか1項に記載の医療デバイス。
- 径方向に拡縮可能な拡張体を有する医療デバイスを用いて、生体組織の貫通孔を拡張させる処置方法であって、
前記拡張体が有する把持部を生体組織の貫通孔に位置決めするステップと、
前記把持部により生体組織を前記貫通孔の両側から把持するステップと、
前記拡張体を拡張させて前記貫通孔の径を大きくするステップと、
前記把持部が有する維持処置要素により維持処置を行うステップと、
を有する処置方法。 - 前記把持部により生体組織を把持するステップは、前記拡張体を拡張させて前記貫通孔の径を大きくするステップの前、または後、あるいは同時に行われる請求項11に記載の処置方法。
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| JP2020510040A JP7357604B2 (ja) | 2018-03-29 | 2019-03-25 | 医療デバイス及び処置方法 |
| EP19778033.1A EP3766431B1 (en) | 2018-03-29 | 2019-03-25 | Medical device |
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Also Published As
| Publication number | Publication date |
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| JP7357604B2 (ja) | 2023-10-06 |
| JPWO2019188916A1 (ja) | 2021-04-01 |
| EP3766431A1 (en) | 2021-01-20 |
| CN111936061B (zh) | 2024-02-09 |
| EP3766431B1 (en) | 2025-06-18 |
| EP3766431A4 (en) | 2021-05-05 |
| CN111936061A (zh) | 2020-11-13 |
| US11950836B2 (en) | 2024-04-09 |
| US20210007790A1 (en) | 2021-01-14 |
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