Pressurizing device

Abstract

A pressurizing device (1) is provided with: a syringe capable of containing a fluid; a plunger (4) that, when moved toward a forward end side relative to the syringe, discharges the fluid to the outside of the syringe; a restriction member (51) capable of moving in an up-down direction between a separation position that is separated from the plunger (4) and a contact position that is in contact with the plunger (4); a lever (61) that, in correspondence with a rotational operation, moves the restriction member (51) from the contact position to the separation position; and a rotation mechanism provided at a position overlapping the restriction member (51) in the up-down direction, which supports the lever (61) so as to be rotatable relative to the restriction member (51), is capable of moving in the up-down direction in correspondence with the rotation of the lever (61), and, when moved downward, imparts a force to the restriction member (51) to move the restriction member (51) from the contact position to the separation position.

Description

[0001] This invention is a divisional application of the invention patent with application number 202180016342.0. The parent application was filed on June 22, 2021, and the invention title of the parent application is "Pressure Device". Technical Field

[0002] This invention relates to a pressurization device used in dilation tools such as dilation balloons. Background Technology

[0003] In the medical field, methods for treating narrowed portions within a living organism using dilation tools such as balloons are known. Furthermore, as devices for dilating these tools, pressurization devices are known for pressurizing a pressure medium composed of fluid or the like into the dilation tool.

[0004] Patent Document 1 discloses a pressurizing device comprising a housing, a plunger, a nut assembly, and a knob. A hose is connected to the housing. Inside the housing is a piston having a cavity communicating with the hose. Both the plunger and the nut assembly have threaded portions. By rotating the knob with the plunger's threaded portion engaged with the nut assembly's threaded portion, the plunger moves within the housing towards the hose. At this time, fluid within the piston's cavity flows out towards the hose. For example, if a balloon is connected to the hose, the balloon inflates due to the fluid flowing into the hose. Meanwhile, the nut assembly is displaced by operating the handle. The engagement between the plunger's threaded portion and the nut assembly's threaded portion is released. At this time, the plunger moves within the housing towards separation from the hose. For example, if the balloon is inflated, fluid is discharged from the balloon, causing the balloon to rapidly contract.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Publication No. 2004-525696 Summary of the Invention

[0008] As a mechanism for releasing the engagement of the plunger's threaded portion with the nut member's threaded portion, a lever is sometimes used. The lever applies force to the nut member by rotation, causing the plunger's threaded portion to disengage from the nut member's threaded portion. For example, in the case of a balloon that has inflated due to fluid, the force acting on the plunger makes it difficult for the plunger's threaded portion to disengage from the nut member's threaded portion. Therefore, when the user attempts to release the engagement by operating the lever, a relatively strong force must be applied, resulting in reduced operability.

[0009] The purpose of this invention is to provide an easy-to-operate pressurization device.

[0010] The pressurizing device of the present invention is characterized by comprising: a syringe having an internal receiving portion capable of containing fluid; a plunger movable relative to the syringe in a first direction, and discharging the fluid contained in the receiving portion to the outside of the syringe when moving in one direction; a limiting member movable between a separation position separated from the plunger and a contact position in contact with the plunger in a second direction intersecting the first direction; a rod that, in response to a rotational action, moves the limiting member from the contact position to the separation position; and a rotating mechanism disposed at a position overlapping the limiting member in the second direction, the rotating mechanism supporting the rod so as to be rotatable relative to the limiting member, the rotating mechanism being movable in the second direction in response to the rotation of the rod, and, when moving in one direction, the rotating mechanism applying force to the limiting member to move the limiting member from the contact position to the separation position.

[0011] When the lever is rotated by operation, it applies a force to the limiting member in a second direction, causing the limiting member to move from the contact position to the separation position. In this case, the lever operation force required to move the limiting member from the contact position to the separation position is smaller compared to the case where the force applied by the lever to the limiting member is dispersed in a direction other than the second direction. Therefore, the pressurizing device can improve the user's operability.

[0012] In this invention, the rotating mechanism may also include: a rotating shaft disposed on one side of the rod and the limiting member; and a support portion disposed on the other side of the rod and the limiting member, and rotatably supported on the rotating shaft. The pressurizing device can improve the rigidity of the rotating mechanism, thus enabling stable movement of the limiting member corresponding to the user's rod operation.

[0013] In this invention, the pressurizing device may also include a force-applying member that applies force to the limiting member along the second direction from the separation position toward the contact position. The force-applying member is capable of stably positioning the limiting member in the contact position without lever operation.

[0014] In this invention, the force-applying member can also be a spring, which contracts when the limiting member is in the separated position and applies force to the limiting member toward the contact position, and extends when the limiting member is in the contact position. The pressurizing device can easily implement a mechanism for holding the limiting member in the contact position using a spring.

[0015] In this invention, the limiting member may also be provided with an anti-displacement mechanism to prevent the force-applying member from shifting position. The pressurizing device can stably apply force to the limiting member through the force-applying member, thus enabling the limiting member to be stably positioned in the contact position.

[0016] In this invention, the plunger may also include a gear, and the limiting member may include an internal gear that meshes with the gear when positioned in the contact position. The limiting member can appropriately suppress movement of the plunger in the first direction when positioned in the contact position.

[0017] In this invention, the gear of the plunger may also be a helical gear, and the internal gear of the limiting member may be a helical internal gear. The user can move the plunger along a first direction by rotating the plunger while the limiting member is in the contact position.

[0018] In this invention, the pressurizing device may also include a main body connected to the syringe, having an internal through-hole through which the plunger passes. The limiting member is movable between a contact position and a separation position, where it contacts the plunger supported on the main body and passing through the through-hole. In this case, the main body can stabilize the position of the limiting member, thus appropriately limiting the movement of the plunger by the limiting member.

[0019] In this invention, the main body may also have a first hole communicating with the through hole, and the limiting member may be movable between the contact position and the separation position by moving along the first hole. In this case, the pressurizing device can suppress the swaying of the limiting member relative to the main body, thus enabling efficient transmission of the force acting on the rod to the limiting member.

[0020] In this invention, the main body may also have a second hole extending from the side of the first hole along the first direction. The pressurizing device further includes a rod having the rod itself, a protrusion disposed at one end of the rod and received in the second hole, and a portion of the rotating mechanism located between the rod and the protrusion. When the rod rotates, the protrusion moves along the second hole in the first direction, while the rotating mechanism does not move in the first direction. The rod forms a lever with the rod as the force point, the protrusion as the fulcrum, and the portion of the rotating mechanism as the point of action. In this case, the rod can efficiently transmit the force acting on the rod to the limiting member, causing the limiting member to move.

[0021] Furthermore, the housing of the pressurizing device described in Reference 1 is formed by combining a syringe with a main body including a nut. In this case, a large pressure is applied inside the housing when using the pressurizing device. Therefore, a mechanism is needed to securely connect the syringe to the main body.

[0022] Another object of the present invention is to provide a pressurizing device that enables a syringe to be securely connected to the body.

[0023] Another aspect of the pressurization device of the present invention includes:

[0024] A syringe, which has an internal receiving part capable of containing fluid;

[0025] A plunger that is movable relative to the syringe in a first direction, and which, when moving in one direction, discharges the fluid contained in the receiving portion to the outside of the syringe;

[0026] A limiting member that restricts the movement of the plunger;

[0027] A body, which is arranged opposite to the syringe in the first direction and supports the limiting member; and

[0028] A connecting mechanism that connects the syringe to the body.

[0029] The pressurizing device is characterized in that...

[0030] The connecting mechanism includes:

[0031] A base is disposed on one of the syringe and the body, and extends along the first direction toward the other of the syringe and the body;

[0032] An elastic portion, which is part of the base portion, extends from the base end toward the front end along a rotational direction centered on a centerline extending along the plunger in the first direction;

[0033] A first protrusion, which is disposed on the elastic portion including a portion of the front end, protrudes radially with respect to the center line, and the radial height gradually increases from the base end toward the front end; and

[0034] A locking portion is disposed on the other side of the syringe and the body, and engages with the first protrusion.

[0035] With the engaging portion positioned on the same side as the base end relative to the first protrusion, the syringe and the body are rotated relative to each other in the rotation direction, and the engaging portion moves to the side opposite to the base end relative to the first protrusion, thereby connecting the syringe to the body.

[0036] When the syringe is connected to the main body, the first protrusion moves due to the elastic force of the elastic part, and the first protrusion engages with the engaging part. Therefore, the pressurizing device can firmly connect the syringe and the main body using a connecting mechanism without the use of adhesives, thus reducing the possibility of adhesives or the like mixing into the liquid. Furthermore, the relative movement direction (rotation direction) of the syringe and the main body during the connection process is orthogonal to the direction in which the syringe and the main body are arranged (the first direction). Therefore, even if a force is applied to the syringe and the main body in the first direction that would cause them to separate, the pressurizing device can effectively prevent the syringe and the main body from detaching. Thus, the pressurizing device can maintain a firmly connected state between the syringe and the main body for a long time.

[0037] In another embodiment, the first end portion of the first protrusion near the engaging portion and the second end portion of the engaging portion near the first protrusion each have a plane extending radially.

[0038] The relative rotation of the syringe and the body is restricted by contact between the first end and the second end.

[0039] In this configuration, the first and second ends contact each other over a wide area of ​​the plane, restricting the rotation of the body relative to the syringe. Therefore, the pressurizing device can stably maintain the connection between the syringe and the body, thus suppressing dimensional errors in each individual component.

[0040] In another embodiment, the connecting mechanism is characterized by having:

[0041] A second protrusion, which protrudes radially from the base, and has a radially protruding projection at its end on the side opposite to the base; and

[0042] A groove is provided on the other side of the syringe and the body, and is fitted into the second protrusion.

[0043] In this case, even if the protrusion has slight irregularities at the bottom of the groove or the front end of the second protrusion, the radial position of the second protrusion within the groove can be stabilized. Therefore, the pressurizing device can eliminate dimensional errors between the syringe and the main body through the protrusion. Attached Figure Description

[0044] Figure 1 This is a three-dimensional view of the pressurization device 1.

[0045] Figure 2 This is an exploded perspective view of the pressurizing device 1.

[0046] Figure 3 This is an exploded side view of the pressurization device 1.

[0047] Figure 4 This is a magnified 3D view of syringe 2.

[0048] Figure 5 This is an enlarged 3D view of the main body 3.

[0049] Figure 6 Viewed from the direction of the arrow Figure 1 The sectional view obtained by drawing the A*A line (before connection).

[0050] Figure 7 Viewed from the direction of the arrow Figure 1 The sectional view obtained by connecting the AA line.

[0051] Figure 8 It is an exploded perspective view of the main body 3, the limiting body 5A, and the rod 6.

[0052] Figure 9 This is a diagram obtained by observing the restrictor 5A from the base side.

[0053] Figure 10 This is the right view of the limiting body 5A.

[0054] Figure 11 This is the right view of rod 6.

[0055] Figure 12 It is a cross-sectional view of the pressurizing device 1 including the limiting body 5A disposed at the contact position.

[0056] Figure 13 It is a cross-sectional view of the pressurizing device 1, including the limiting body 5A disposed in the separation position. Detailed Implementation

[0057] The pressurization device 1, which is an embodiment of the present invention, will be described. In the following description, Figure 1 The upper side, lower side, upper left side, lower right side, lower left side, and upper right side are defined as the upper side, lower side, left side, right side, front end side, and base end side of the pressurizing device 1, respectively. The direction extending within the range of the front end side and the base end side is defined as the extension direction.

[0058] <Overview of Pressurization Device 1>

[0059] The pressurizing device 1 is, for example, an indeflator, used to cause the balloon (not shown) used in the expansion of the stenosis to expand / contract and deform. Figures 1-3 As shown, the pressurizing device 1 includes a syringe 2, a main body 3, a plunger 4, and a limiting body 5A (see reference). Figure 3 ), Force-applying component 5B (refer to) Figure 3 The syringe 2 and the rod 6. The pressurizing device 1 pressurizes the fluid contained in the syringe 2 into the balloon through the conduit, causing the balloon to expand. The plunger 4 is operated when fluid is pressurized from the syringe 2. In addition, the pressurizing device 1 can discharge fluid from the balloon by operating the rod 6 supported on the main body 3, causing the balloon to contract.

[0060] <Instrument 2>

[0061] The syringe 2 has a barrel 21, a flange 22, a connector 23, a pressure gauge connector 24, and a connecting part 26 (see reference). Figure 2 , Figure 3 The cylinder 21 is a transparent cylindrical component. The base end of the cylinder 21 is open. The cylinder 21 has an internal receiving portion 20 capable of containing fluid. An imaginary line passing through the center of the cylinder 21 and extending in the extending direction is called the centerline C. Scales are provided on the side of the cylinder 21 for visually confirming the volume of fluid contained in the receiving portion 20.

[0062] Flange 22 is located at the base end of cylinder 21 and protrudes outward. For example... Figure 2 , Figure 3 As shown, a connecting portion 26 for connecting the syringe 2 to the body 3 is provided on the base end side of the flange 22. Details of the connecting portion 26 will be described later. Figures 1-3 As shown, connection port 23 is located at the front end of cylinder 21. Connection port 23 is cylindrical with a diameter smaller than that of cylinder 21. Connection port 23 extends from the front end of cylinder 21 toward the front end side along centerline C. One end of a resin tube (not shown) is connected to connection port 23. A three-way valve is connected to the other end of the resin tube, and a conduit (not shown) connected to the front end of the three-way valve is connected to the conduit for connection to the balloon. Pressure gauge connection port 24 is located near the front end in the side of cylinder 21. A pressure gauge (not shown) is connected to pressure gauge connection port 24 for measuring the pressure of fluid contained in containment section 20.

[0063] <Link 26>

[0064] like Figure 4As shown, the connecting part 26 has connecting bodies 26A and 26B. The shapes of connecting bodies 26A and 26B are point-symmetric about the center line C. Connecting body 26A has a base 81 and protrusions 82, 83, and 84. Connecting body 26B has a base 86 and protrusions 87, 88, and 89. Hereinafter, unless otherwise specified, the state of the connecting part 26 as viewed from the front end is assumed. Figure 6 , Figure 7 The state of rotation (clockwise / counterclockwise) centered on the center line C is defined. Furthermore, connector 26A is explained in detail, while the explanation of connector 26B is simplified.

[0065] The base 81 has a curved plate shape and extends from the base end side of the flange 22 of the syringe 2 toward the base end side. When viewed from the base end side, the base 81 has an arc shape centered on the center line C. The shape of the base 81 corresponds to the upper portion of the cylindrical body extending along the center line C in the vertical direction. The base 81 is convexly curved upwards. The two ends of the base 81 in the circumferential direction are referred to as ends 811 and 812. Figure 6 , Figure 7 As shown, the direction along the base 81 from end 811 toward end 812 is counterclockwise. Protrusions 82, 83, and 84 are provided on the outer surface of the base 81. Protrusions 82, 83, and 84 are arranged in a counterclockwise direction. Protrusion 84 is provided at end 812 of the base 81.

[0066] like Figure 4 As shown, the protrusion 82 is slightly separated from the end 811 in a counterclockwise direction. The protrusion 82 has a pair of protrusions 820, each of which is plate-shaped. The pair of protrusions 820 project radially from the outer surface of the base 81, centered on the centerline C. The pair of protrusions 820 have substantially the same shape and are separated in their extending direction. Figure 6 As shown, the end 821 of one of the pair of protrusions 820, located near end 811 in the rotational direction, extends radially parallel to the centerline C. The end 822 of one of the pair of protrusions 820, located near end 812 in the rotational direction, is inclined relative to the radial direction centered on the centerline C. The height of the pair of protrusions 820 increases towards the clockwise direction at the position of end 822. A pair of radially projecting protrusions 82P are provided at the radially front end 823 of each of the pair of protrusions 820. The pair of protrusions 82P extend in the extending direction and separate in the rotational direction.

[0067] like Figure 4As shown, protrusion 83 is slightly separated clockwise from end 812. Protrusion 83, like protrusion 82, has a pair of protrusions 830, which are plate-shaped. The pair of protrusions 830 project radially from the outer surface of base 81, centered on centerline C. The pair of protrusions 830 have substantially the same shape and are separated in the extending direction. Figure 6 As shown, the end 832 of one of the pair of protrusions 830, located near the end 812 in the rotational direction, extends radially parallel to the center line C. The end 831 of one of the pair of protrusions 830, located near the end 811 in the rotational direction, is inclined relative to the radial direction centered on the center line C. The height of the pair of protrusions 830 increases at the position of the end 831 in a counterclockwise direction. At the front end of each of the pair of protrusions 830, there is a pair of protrusions (not shown) with the same shape as the pair of protrusions 82P of the protrusion 82.

[0068] like Figure 4 As shown, the protrusion 84 protrudes radially from the end 812 of the base 81, centered on the center line C. The end 812 is planar and orthogonal to the direction of rotation. Figure 6 As shown, the end 841 of the protrusion 84, on the side opposite in rotation to the end 812, is inclined radially relative to the centerline C. The radial length (height) of the protrusion 84 increases at the position of the end 841 in a counterclockwise direction. Figure 4 As shown, a slit 813 extending clockwise from the end 812 is provided in the base 81. The portion of the base 81 closer to the base end than the slit 813 is called the elastic portion 810. The elastic portion 810 extends in the rotational direction. The elastic portion 810 is capable of elastic deformation in a radial direction centered on the centerline C. A protrusion 84 is formed at the front end of the elastic portion 810.

[0069] like Figure 4As shown, the base 86 is curved downwards in a convex shape. The ends 861, 862, and protrusions 87, 88, and 89 of the base 86 correspond to the ends 811, 812, and protrusions 82, 83, and 84 of the base 81. The pair of protrusions 870, ends 871, and 872 of the protrusion 87, and a pair of protrusions (not shown) correspond to the pair of protrusions 820, ends 821, and 822 of the protrusion 82, and a pair of protrusions 82P of the protrusion 88. The pair of protrusions 880, ends 881, and 882 of the protrusion 88, and a pair of protrusions 88P correspond to the pair of protrusions 830, ends 831, and 832 of the protrusion 83, and a pair of protrusions (not shown). The end 891 of the protrusion 89 corresponds to the end 841 of the protrusion 84. The slit 863 and the elastic part 860 of the base 86 correspond to the slit 813 and the elastic part 810 of the base 81, respectively.

[0070] <Main Body 3>

[0071] like Figures 1-3 As shown, the main body 3 is located at the base end of the syringe 2 and has a base 31, a flange 32, and a connecting portion 36 (see reference). Figure 2 The base 31 is generally cylindrical and extends along the centerline C. (As shown) Figure 5 As shown, a through hole 30 extending along the centerline C is formed in the base 31. The through hole 30 extends within the range between the base end and the front end of the base 31 and penetrates the base 31. The plunger 4 described later (see...) Figure 3 (Pass through the through hole 30)

[0072] A first recessed hole 33 is formed near the front end of the side surface of the base 31. The opening of the first hole 33 is rectangular and is formed at the upper end of the base 31. The first hole 33 communicates with the through hole 30 and extends to a position lower than the through hole 30 (see reference). Figure 12 , Figure 13 The bottom surface of the first hole 33 is located below the through hole 30. For example... Figure 8 As shown, the first hole 33 houses the limiting body 5A (described later), the force-applying member 5B, and a portion of the rod 6. Figure 5 As shown, a second hole 34 is formed near the upper end of the inner surface of the first hole 33 on the front end side, recessed towards the front end side. The second hole 34 extends towards the front end side. The rod 6 (see reference) is received in the second hole 34. Figures 1-3 Part of ).

[0073] like Figures 1-3 As shown, flange 32 is provided at the front end of base 31. Figure 2As shown, the flange 32 is cylindrical and open at the front end. A connecting portion 36 for connecting the main body 3 and the syringe 2 is provided on the inner side of the flange 32.

[0074] <Link 36>

[0075] like Figure 5 As shown, the connecting portion 36 has engaging portions 92, 93, 94, 97, 98, and 99. Engaging portions 92, 93, 94, 97, 98, and 99 are provided on the inner surface of the flange 32. Engaging portions 92, 93, 94, 97, 98, and 99 are arranged in a counterclockwise direction.

[0076] like Figure 5 As shown, engaging portions 92, 93, 97, and 98 protrude inward from the inner side of flange 32. Engaging portion 97 has a pair of grooves 970 extending clockwise from end 972 near engaging portion 98. The pair of grooves 970 are separate and extend parallel in the extending direction. Engaging portion 92, similarly to engaging portion 97, has a pair of grooves 920 extending clockwise from end 922 near engaging portion 93. The pair of grooves 920 are separate and extend parallel in the extending direction. Engaging portion 93 has a pair of grooves 930 extending within the clockwise direction at both ends. The pair of grooves 930 are separate and extend parallel in the extending direction. Engaging portion 98 has a pair of grooves 980 extending within the clockwise direction at both ends. The pair of grooves 980 are separate and extend parallel in the extending direction.

[0077] The engaging portion 94 has an end 941 approaching the engaging portion 93 and an end 942 approaching the engaging portion 97. End 941 extends radially from the inner surface of the flange 32 toward the center line C. End 941 is planar and orthogonal to the direction of rotation. End 942 extends from the inner surface of the flange 32 toward the center line C in a direction inclined relative to the radial direction. The height of the engaging portion 94 increases towards the clockwise direction at the position of end 942. The engaging portion 99 has an end 991 approaching the engaging portion 98 and an end 992 approaching the engaging portion 92. End 991 extends radially from the inner surface of the flange 32 toward the center line C. End 992 extends from the inner surface of the flange 32 toward the center line C in a direction inclined relative to the radial direction. The height of the engaging portion 99 increases towards the clockwise direction at the position of end 992.

[0078] <Method for connecting syringe 2 and body 3>

[0079] The syringe 2 and the main body 3 are connected during the assembly process of the pressurizing device 1. The syringe 2 and the main body 3 are connected by connecting parts 26 and 36. The connection method of the syringe 2 and the main body 3 will be described below.

[0080] The syringe 2 and the body 3 are arranged separately in the extending direction. The syringe 2 is positioned at the front end, and the body 3 is positioned at the base end. Next, the syringe 2 and the body 3 are brought close together. At this time, as... Figure 6 As shown, the protrusion 82 of syringe 2 enters between the engaging portions 92 and 93 of the main body 3. The protrusion 83 of syringe 2 enters between the engaging portions 93 and 94 of the main body 3. The protrusion 84 of syringe 2 enters between the engaging portions 94 and 97 of the main body 3. The protrusion 87 of syringe 2 enters between the engaging portions 97 and 98 of the main body 3. The protrusion 88 of syringe 2 enters between the engaging portions 98 and 99 of the main body 3. The protrusion 89 of syringe 2 enters between the engaging portions 99 and 92 of the main body 3.

[0081] In this state, rotate syringe 2 clockwise relative to body 3. At this time, as... Figure 7 As shown, a pair of protrusions 820 of the protrusion 82 of the syringe 2 enter a pair of grooves 920 of the engaging portion 92 of the main body 3 (see reference). Figure 5 A pair of protrusions 830 of the protrusion 83 of syringe 2 (see reference) Figure 4 The pair of slots 930 that enter the engaging part 93 of the main body 3 (see reference) Figure 5 The pair of protrusions 870 of the protrusion 87 of syringe 2 enters the pair of grooves 970 of the engaging part 97 of the main body 3 (see reference). Figure 5 A pair of protrusions 880 of the protrusion 88 of syringe 2 (see reference). Figure 4 The pair of slots 980 that enter the engaging part 98 of the main body 3 (see reference) Figure 5 ).

[0082] Furthermore, the end 841 of the protrusion 84 of the syringe 2 contacts the end 942 of the engaging portion 94 of the main body 3. The protrusion 84 of the syringe 2 moves inward due to elastic deformation caused by the elastic portion 810, passing through the engaging portion 94 of the main body 3 in a clockwise direction. After the protrusion 84 of the syringe 2 passes through the engaging portion 94 of the main body 3, the elastic portion 810 returns to its original state under the action of elastic force. The end 812 of the syringe 2 contacts the end 941 of the engaging portion 94 of the main body 3. Similarly, the end 891 of the protrusion 89 of the syringe 2 contacts the end 992 of the engaging portion 99 of the main body 3. The protrusion 89 of the syringe 2 moves inward due to elastic deformation caused by the elastic portion 860, passing through the engaging portion 99 of the main body 3 in a clockwise direction. After the protrusion 89 of the syringe 2 passes through the engaging portion 99 of the main body 3, the elastic portion 860 returns to its original state under the action of elastic force. The end 862 of syringe 2 contacts the end 991 of the engaging portion 99 of the main body 3. Here, the ends 812 and 862 of syringe 2 and the ends 941 and 991 of the main body 3 all extend radially about the center line C. Therefore, with the end 812 of syringe 2 in contact with the end 941 of the main body 3 and the end 862 of syringe 2 in contact with the end 991 of the main body 3, counterclockwise rotation of syringe 2 relative to the main body 3 is suppressed. Through this, syringe 2 is connected to the main body 3 and cannot detach.

[0083] <Restriction body 5A, force-applying component 5B>

[0084] like Figure 3 , Figure 8 As shown, the limiting body 5A is supported by the first hole 33 in the main body 3 while being received in the first hole 33. The limiting body 5A is movable relative to the main body 3 in the vertical direction. Figure 8 , Figure 9 , Figure 10 As shown, the limiting body 5A has a limiting member 51, a rib 52, and a rotation axis 53. Figure 9 As shown, the limiting member 51 has a generally U-shape. The limiting member 51 has a recess 54 that is recessed downwards from its upper end. The bottom of the recess 54 is curved in an arc shape. The curvature of the bottom of the recess 54 corresponds to the through hole 30 of the main body 3 (see reference). Figure 8 The curvatures of the two holes are equal. With the first hole 33 of the main body 3 housing the restrictor 5A, a portion of the recess 54 of the restrictor 5A overlaps with the through hole 30 of the main body 3 in the extending direction (see reference). Figure 12 , Figure 13 A helical internal gear 50 is formed on the curved portion at the bottom of the recess 54.

[0085] Rib 52 protrudes downward from the lower end of the limiting member 51. A notch 520 is provided at the lower end of rib 52, notching upward. A recess 52A is formed on the base end side of rib 52, recessed towards the front end side (see reference). Figure 8 The upper end of the recess 52A is covered by the lower end of the limiting member 51. The lower end of the recess 52A is open. The rotation shaft 53 is connected to the upper ends of a pair of protrusions 51A that project upward from the upper end of the limiting member 51. The rotation shaft 53 is cylindrical and extends in a left-right direction within the range between the pair of protrusions 51A. The left and right ends of the rotation shaft 53 project outward relative to the pair of protrusions 51A.

[0086] like Figure 8 As shown, the force-applying member 5B is a compression coil spring. The force-applying member 5B is accommodated in a recess 52A formed by the rib 52 in the limiting body 5A, which is capable of extending and retracting in the vertical direction. The lateral displacement of the force-applying member 5B is suppressed by the rib 52. Figure 12 ,like Figure 13 As shown, the upper end of the force-applying member 5B contacts the limiting member 51 of the limiting body 5A from below. The lower end of the force-applying member 5B contacts the bottom surface of the first hole 33 of the main body 3 from above. The force-applying member 5B applies an upward force to the limiting body 5A.

[0087] <Pole 6>

[0088] like Figure 1 , Figure 2 As shown, the rod 6 is supported near the front end of the base 31 in the upper part of the main body 3, allowing it to rotate. Figure 8 , Figure 11 As shown, the rod 6 has a rod 61, a protrusion 62, and a support 63. The support 63 is located between the rod 61 and the protrusion 62. The support 63 has a through hole 60A extending through the area between the left and right sides and a connecting portion 60B extending downward from the through hole 60A. The through hole 60A and the groove 60 are integral, and the groove 60 is formed on the lower surface of the support 63. The protrusion 62 protrudes from the side of the support 63 at the base end towards the base end. The front end of the protrusion 62 is angularly bent. The rod 61 has an elongated, curved plate shape. The rod 61 extends obliquely upward from the upper side of the support 63 towards the front end.

[0089] like Figure 12 , Figure 13As shown, by fitting the rotation shaft 53 of the limiting body 5A into the slot 60, the support portion 63 of the rod 6 is rotatably supported on the rotation shaft 53. The positions of the limiting body 5A, the rotation shaft 53, and the support portion 63 overlap in the vertical direction. The rod 61 is rotatably supported on the limiting body 5A via the support portion 63. The rotation center of the rod 6 coincides with the rotation shaft 53 disposed in the through hole 60A of the slot 60. It should be noted that the position of the rotation shaft 53 moves in a vertical direction corresponding to the vertical movement of the limiting body 5A within the first hole 33. That is, the rotation center of the rod 6 moves in a vertical direction corresponding to the movement of the limiting body 5A. The direction of movement of the rotation center of the rod 6 coincides with the direction in which the limiting body 5A can move. The protrusion 62 of the rod 6 enters the second hole 34 of the main body 3 from the front end side. The position of the front end of the protrusion 62 can move in the extension direction corresponding to the rotation of the rod 6.

[0090] <Plug 4>

[0091] like Figure 3 As shown, the plunger 4 has a rod 41, a gripper 42, and a gasket 43. The rod 41 is cylindrical and extends along the centerline C in the extending direction. The diameter of the rod 41 is the same as the through hole 30 of the main body 3 (see reference). Figure 8 The diameters of the rod 41 and the concave portion 54 of the limiting body 5A are approximately the same. The curvature of the rod 41 is the same as the curvature of the bottom of the concave portion 54 of the limiting body 5A. A helical gear 40 is formed on the peripheral wall of the rod 41.

[0092] The gripper 42 is located at the base end of the rod 41. For example... Figure 1 , Figure 2 As shown, the gripper 42 is plate-shaped and orthogonal to the extending direction. The end of the gripper 42 is wavy. The gripper 42 is held by the user when rotating the plunger 4. Figure 2 , Figure 3 As shown, a pad 43 is provided at the front end of the rod 41. The pad 43 is made of rubber and is larger than the diameter of the rod 41. The pad 43 is provided to improve the fit with the receiving part 20 of the syringe 2.

[0093] The plunger 4 is supported on the body 3 with the rod 41 passing through the through hole 30 of the body 3. The rod 41 passes inside the recess 54 of the restraining member 51 housed in the first hole 33 of the body 3 along the extending direction. The gripper 42 is located at a position closer to the base end of the body 3. The liner 43 is located at a position closer to the front end of the body 3 and is located within the housing 20 of the syringe 2. The plunger 4 can move in the extending direction relative to the syringe 2, the body 3, and the restraining member 5A. When the plunger 4 moves towards the front end, the fluid housed in the housing 20 is discharged to the outside through the connection port 23 of the syringe 2.

[0094] <Movement of limiting member 51 caused by operation of lever 61>

[0095] The restraining member 51 receives an upward force from the force-applying member 5B. For example... Figure 12 As shown, without applying an external force to the rod 61 of the rod 6, the limiting member 51 moves upward according to the force received from the force-applying member 5B. At this time, the bottom of the recess 54 of the limiting member 51 contacts a portion of the rod 41 of the plunger 4 from below. A portion of the helical gear 40 of the rod 41 meshes with the helical internal gear 50. The force-applying member 5B extends. The following describes the position of the limiting member 51 with the bottom of the recess 54 in contact with a portion of the rod 41 of the plunger 4. Figure 12 The position shown is called the contact position.

[0096] When a downward external force is applied to rod 61 of rod 6, rod 6 rotates counterclockwise about the rotation axis 53 when viewed from the right. Figure 13 As shown, the protrusion 62 of the rod 6 rotates about the rotation axis 53 and moves upward within the second hole 34 of the main body 3. The upward movement of the protrusion 62 is restricted by its contact with the upper side of the inner surface of the second hole 34 from below. At this time, the rod 6 forms a second type of lever with the rod 61 as the force point, the support 63 as the point of action, and the protrusion 62 as the fulcrum. Therefore, the downward force acting on the rod 61 acts on the support 63, causing the support 63 and the rotation axis 53 to move downward. Consequently, the restricting member 51 is subjected to a downward force that overcomes the force exerted by the force-applying member 5B. The restricting member 51 moves downward relative to the contact position.

[0097] It should be noted that the protrusion 62 of the rod 6 is not fixed to the main body 3. Therefore, when the rod 61 rotates, the protrusion 62 moves slightly towards the base end along the second hole 34. However, the position of the rotation axis 53 of the limiting body 5A and the support portion 63 supported on the rotation axis 53 does not move in the extending direction, but only in the vertical direction. Therefore, the force transmitted from the rod 61 to the limiting member 51 via the support portion 63 and the rotation axis 53 acts vertically downwards, and does not act in a direction inclined relative to downwards.

[0098] Corresponding to the downward movement of the limiting member 51, the bottom of the recess 54 of the limiting member 51 separates downward relative to a portion of the rod 41 of the plunger 4. The engagement of a portion of the helical gear 40 of the rod 41 with the helical internal gear 50 is eliminated. The force-applying member 5B retracts. The following describes the position of the limiting member 51 with the bottom of the recess 54 separated from a portion of the rod 41 of the plunger 4. Figure 13 The position shown is called the separation position.

[0099] <How to use>

[0100] The user connects the base end of the catheter, which has a balloon at its front end, to the connection port 23 of the syringe 2. Fluid for inflating the balloon is pre-contained in the receiving portion 20 of the syringe 2's barrel 21. Without external force applied to the rod 61, the limiting member 51 moves upward and reaches the contact position under the force of the force-applying member 5B. The helical internal gear 50 of the limiting member 51 meshes with a portion of the helical gear 40 of the plunger 4's rod 41. Therefore, the movement of the plunger 4 in the extension direction is limited by the limiting member 51.

[0101] The user grips the handle 42 of the plunger 4 and rotates it. The rod 41 rotates while a portion of the internal helical gear 50 of the limiting member 51 is engaged with the helical gear 40, thus moving the rod 41 towards the front end. The liner 43 of the plunger 4 squeezes the fluid contained in the receiving portion 20 of the syringe 2 outwards through the connection port 23. The fluid squeezed from the syringe 2 flows into the balloon through the catheter. This inflates the balloon, thus treating the affected area. The user can control the pressure of the fluid flowing into the balloon by adjusting the amount of rotation of the handle 42 of the plunger 4.

[0102] It should be noted that, corresponding to the increase in fluid pressure as the plunger 4 moves towards the front end, a force acts on the plunger 4 towards the base end. However, the limiting member 51 is in the contact position, and the helical internal gear 50 of the limiting member 51 meshes with a portion of the helical gear 40 of the rod body 41 of the plunger 4. Therefore, the movement of the plunger 4 towards the base end is limited by the limiting member 51.

[0103] After treatment of the affected area by balloon dilation is completed, the user grips the rod 61 and applies downward force. The rod 6 rotates around the rotation axis 53, causing the support 63 and the rotation axis 53 to move downward. The limiting member 51 is subjected to a downward force that overcomes the force applied by the force-applying member 5B, moving from the contact position to the separation position. The engagement of a portion of the helical gear 40 of the plunger 4's rod 41 with the helical internal gear 50 is eliminated. The plunger 4, under the pressure of the fluid within the receiving portion 20 of the syringe 2, moves towards the base. The fluid pressure decreases, and fluid is expelled from the balloon. As a result, the balloon rapidly contracts.

[0104] <Function and Effects of This Implementation Method>

[0105] When the lever 61 is rotated by the user, it applies a downward force to the limiting member 51, enabling the limiting member 51 to move from the contact position to the separation position. In this case, the protrusion 62 of the lever 6 is not fixed to the main body 3. Furthermore, the support portion 63 of the lever 6, the limiting member 51 of the limiting body 5A, and the rotation axis 53 are arranged overlapping in the vertical direction. Therefore, the lever 61 can apply a downward force to the limiting member 51 without changing the position of the extension direction of the rotation axis 53. In this case, compared to a situation where the force applied by the lever 61 to the limiting member 51 is dispersed in a direction other than downward, the force required to move the limiting member 51 from the contact position to the separation position is smaller. Therefore, the pressure device 1 improves the user's operability.

[0106] When the plunger 4's gripper 42 is rotated to expel fluid from the syringe 2 into the balloon and the balloon is inflated, the fluid pressure increases. Due to this pressure, a force acts on the plunger 4 in the direction towards the base end. Therefore, a portion of the helical gear 40 of the plunger 4's rod 41 is forcefully pressed against the helical internal gear 50 of the limiting member 51 located in the contact position. Therefore, the limiting member 51 becomes difficult to move from the contact position to the separation position. In contrast, by operating the lever 61 in this state, the user moves the limiting member 51 from the contact position to the separation position, thereby enabling the plunger 4 to move towards the base end. At this time, the lever 61 can efficiently transmit the downward force against the lever 61 to the limiting member 51. Therefore, the force required for the user to operate the lever 61 can be suppressed. Therefore, the user can easily switch the state of movement of the limiting plunger 4 towards the base end in the pressurizing device 1 to the state of movement towards the base end by operating the lever 61.

[0107] In the pressurizing device 1, a rotating shaft 53 is provided in the limiting member 51, and a support portion 63 is provided in the rod 61. In this case, compared to the case where the limiting member 51 and the rotating shaft 53 are separate, or the rod 61 and the support portion 63 are separate, the rigidity of the rotating shaft 53 and the support portion 63 can be improved in the pressurizing device 1. Therefore, the pressurizing device 1 can stably move the limiting member 51 in accordance with the user's operation on the rod 61.

[0108] The pressurizing device 1 includes a force-applying member 5B that applies force upward from the separation position toward the contact position to the limiting member 51. The force-applying member 5B can stably position the limiting member 51 in the contact position without operating the lever 61.

[0109] The force-applying member 5B can stably hold the limiting member 51 in the contact position. Therefore, the pressurizing device 1 can stably maintain the state in which the limiting member 51, positioned in the contact position, restricts the movement of the plunger 4 towards the base end. Therefore, the user can easily maintain the state in which the balloon is expanded by the fluid discharged from the receiving portion 20 of the syringe 2 due to the movement of the plunger 4 towards the front end.

[0110] The force-applying member 5B is a compression helical spring. When the limiting member 51 is in the separated position, the force-applying member 5B contracts and applies force to the limiting member 51 toward the contact position. Conversely, when the limiting member 51 is in the contact position, the force-applying member 5B extends. The pressurizing device 1 can easily realize the force-applying member for holding the limiting member 51 in the contact position using a spring.

[0111] The limiting member 51 is provided with a rib 52 to prevent the force-applying member 5B from shifting position. In this case, the pressurizing device 1 can apply force to the limiting member 51 stably using the force-applying member 5B, and thus can stably position the limiting member 51 in the contact position.

[0112] The plunger 4 has a helical gear 40, and the limiting member 51 has a helical internal gear 50. In this case, the limiting member 51 can appropriately suppress the movement of the plunger 4 towards the base end when it is in the contact position. In addition, the user can move the plunger 4 towards the front end by rotating the plunger 4 while the limiting member 51 is in the contact position.

[0113] The main body 3 of the pressurizing device 1 supports the limiting body 5A so that it can move vertically. In this case, the main body 3 can stabilize the position of the limiting member 51 of the limiting body 5A in the extension direction, thus appropriately limiting the movement of the plunger 4 by the limiting member 51. In addition, the limiting body 5A moves vertically along the first hole 33 of the main body 3, thereby moving between the contact position and the separation position. In this case, the pressurizing device 1 can suppress the swaying of the limiting body 5A relative to the extension direction of the main body 3, thus efficiently transmitting the force acting on the rod 61 to the limiting body 5A.

[0114] The rod 6 forms a second type of lever with the rod 61 as the force point, the protrusion 62 as the fulcrum, and the support 63 as the point of action. Furthermore, when the rod 6 rotates, the protrusion 62 moves slightly towards the base end along the second hole 34 of the main body 3. On the other hand, the rotation axis 53 of the restrictor 5A and the support 63 of the rod 6 do not move in the extending direction. In this case, the rod 6 can efficiently transmit the force acting on the rod 61 in the vertical direction to the restrictor 51, causing the restrictor 51 to move in the vertical direction.

[0115] The connecting portion 26 of the syringe 2 has a protrusion 84 provided in the elastic portion 810 and a protrusion 89 provided in the elastic portion 860. The connecting portion 36 of the main body 3 has engaging portions 94 and 99. The protrusion 84 moves inward by elastic deformation of the elastic portion 810 and passes through the engaging portion 94 in a clockwise direction. Afterward, the elastic portion 810 returns to its original state under the action of elastic force, and the end 812 of the protrusion 84 contacts the end 941 of the engaging portion 94. In addition, the protrusion 89 moves inward by elastic deformation of the elastic portion 860 and passes through the engaging portion 99 in a clockwise direction. Afterward, the elastic portion 860 returns to its original state under the action of elastic force, and the end 862 of the protrusion 84 abuts against the end 991 of the engaging portion 99 of the main body 3. Therefore, the pressurizing device 1 can firmly connect the syringe 2 and the main body 3 by means of the connecting parts 26 and 36 without the use of adhesives, thus reducing the possibility of adhesives or the like mixing into the liquid inside the syringe.

[0116] When the syringe 2 squeezes the fluid contained in the receiving section 20 outward, a force is applied to the syringe 2 and the main body 3 in a direction that separates them along the extension direction. Conversely, the relative movement direction (rotation direction centered on the center line C) of the syringe 2 and the main body 3 during the connection process is orthogonal to the alignment direction, i.e., the extension direction, of the syringe 2 and the main body 3. Therefore, even if the pressurizing device 1 repeatedly applies a force to the syringe 2 and the main body 3 in a direction that separates them, it can effectively prevent the syringe 2 and the main body 3 from separating. Thus, the pressurizing device 1 can maintain the syringe 2 and the main body 3 firmly connected for a long time.

[0117] The ends 812 and 862 of the protrusions 84 and 89, and the ends 941 and 991 of the main body 3, are all planar and extend radially around the center line C. Therefore, when the end 812 of the syringe 2 is in contact with the end 941 of the main body 3, and the end 862 of the syringe 2 is in contact with the end 991 of the main body 3, counterclockwise rotation of the syringe 2 relative to the main body 3 is suppressed. The ends 812 and 862 of the protrusions 84 and 89, and the ends 941 and 991 of the main body 3, contacting each other in a wide planar area, restrict the rotation of the main body 3 relative to the syringe 2. Therefore, the pressurizing device 1 can stably maintain the connection between the syringe 2 and the main body 3, thus suppressing dimensional errors in each individual component.

[0118] The protrusions 82, 83, 87, and 88 of the connecting portion 26 each have a pair of radially projecting protrusions 82P and 88P at their radially protruding front ends 823 and 883, respectively. When the protrusions 82, 83, 87, and 88 are inserted into the grooves 920, 930, 970, and 980 of the main body 3, the pair of protrusions 82P and 88P contact the bottom of the grooves 920, 930, 970, and 980. Even when the bottom of the grooves 920, 930, 970, and 980, and the front ends 823 and 883 of the protrusions 82, 83, 87, and 88 have slight irregularities, the radial position of the protrusions 82, 83, 87, and 88 within the grooves 920, 930, 970, and 980 can be stabilized. Therefore, the pressurizing device 1 can eliminate the dimensional error between the syringe 2 and the main body 3 through a pair of protrusions 82P and 88P.

[0119] <Variation Example>

[0120] This invention is not limited to the above-described embodiments, and various modifications are possible. The syringe 2 and the main body 3 may also be inseparable. That is, the syringe 2 and the main body 3 may also be integrally formed.

[0121] Alternatively, the rotating shaft 53 can be incorporated into the rod 6 instead of the limiting body 5A. For example, the rotating shaft 53 can also be provided on the rod 61. Alternatively, the support portion 63 can be incorporated into the limiting body 5A instead of the rod 6. The rotation mechanism including the rotating shaft 53 and the support portion 63 can also be provided separately relative to the limiting body 5A and the rod 6.

[0122] It may also have a locking mechanism that holds the limiting member 51 in both the contact and separation positions. For example, the locking mechanism may also hold the position of the rod 61 in both the contact and separation positions of the limiting member 51. In this case, the pressurizing device 1 may not have a force-applying member 5B.

[0123] The force-applying member 5B is not limited to a compression coil spring, but can also be other elastic components. For example, the force-applying member 5B can also be a rubber sheet. The rib 52 can also be provided on the bottom surface of the first hole 33 of the main body 3. The rib 52 can also be formed as a rod passing through the center of the compression coil spring that serves as the force-applying member 5B.

[0124] The plunger 4 and the limiting member 51 may also be without gears. For example, the limiting member 51 may also limit the movement of the plunger 4 toward the base end by means of the frictional force generated in the state of contact with the rod 41 of the plunger 4.

[0125] <Other>

[0126] The extending direction is an example of the "first direction" of the present invention. The front end side is an example of the "one side of the first direction" of the present invention. The base end side is an example of the "other side of the first direction" of the present invention. The lower side is an example of the "one side of the second direction" of the present invention. The support portion 63 and the rotating shaft 53 are examples of the "rotation mechanism" of the present invention. The rib 52 is an example of the "prevention mechanism" of the present invention.

Claims

1. A pressurizing device, comprising: A syringe, which has an internal receiving part capable of containing fluid; A plunger that is movable relative to the syringe in a first direction, and which, when moving in one direction, discharges the fluid contained in the receiving portion to the outside of the syringe; A limiting member that restricts the movement of the plunger; A body, which is arranged opposite to the syringe in the first direction and supports the limiting member; and A connecting mechanism that connects the syringe to the body. The pressurizing device is characterized in that... The connecting mechanism includes: A base is disposed on one of the syringe and the body, and extends along the first direction toward the other of the syringe and the body; An elastic portion, which is part of the base portion, extends from the base end toward the front end along a rotational direction centered on a centerline extending along the plunger in the first direction; A first protrusion, which is disposed on a portion of the elastic portion including the front end, protrudes radially with respect to the center line, and the radial height gradually increases as it moves from the base end toward the front end; as well as A locking portion is disposed on the other side of the syringe and the body, and engages with the first protrusion. With the engaging portion positioned on the same side as the base end relative to the first protrusion, the syringe and the body are rotated relative to each other in the rotation direction, and the engaging portion moves to the side opposite to the base end relative to the first protrusion, thereby connecting the syringe to the body.

2. The pressurizing device according to claim 1, characterized in that, The first end portion of the first protrusion near the engaging portion and the second end portion of the engaging portion near the first protrusion each have a plane extending radially. The relative rotation of the syringe and the body is restricted by contact between the first end and the second end.

3. The pressurizing device according to claim 1 or 2, characterized in that, The connecting mechanism has: The second protrusion protrudes radially from the base and has a radially protruding portion at its end on the side opposite to the base; as well as A groove is provided on the other side of the syringe and the body, and is fitted into the second protrusion.

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