Pressurizing Device

Abstract

To provide a pressure device that allows a syringe and a body to be firmly connected together.SOLUTION: A pressure device includes a syringe 2, a plunger, a regulation member capable of regulating the movement of the plunger, a body for supporting the regulation member, and a connection mechanism for connecting the syringe 2 and the body together. The connection mechanism includes base parts 81 and 86 provided in one of the syringe 2 and the body, elastic parts 810 and 860, which are parts of the base parts 81 and 86, and extend from the base end to the tip along a rotational direction with a center line extending along the plunger as a center, protruding parts 84 and 89 provided at parts including the tip of the elastic parts 810 and 860, which protrude in a radial direction with the center line as a reference, and whose height in the radial direction gradually increases from the base end to the tip, and an engagement part provided in the other of the syringe 2 and the body, which engages with the protruding parts 84 and 89.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a pressurizing device used when expanding an expansion device such as a balloon. [Background technology]

[0002] In the medical field, a method for treating a stenosis in a living body using an expansion device such as a balloon is known. In addition, a pressurizing device that pumps a pressurized medium such as a fluid to the expansion device is known as a device for expanding the expansion device.

[0003] Patent Document 1 discloses a pressurizing device including a housing, a plunger, a nut member, a knob, and the like. A hose is connected to the housing. A piston having a cavity communicating with the hose is provided inside the housing. The plunger and the nut member each include a threaded portion. When the knob is rotated with the threaded portion of the plunger engaged with the threaded portion of the nut member, the plunger moves in the housing in a direction approaching the hose. At this time, the fluid in the cavity of the piston flows out toward the hose. For example, when a balloon is connected to the hose, the balloon expands due to the fluid that flows out into the hose. Meanwhile, the nut member is displaced by operating the grip portion. The engagement state of the threaded portion of the plunger with the threaded portion of the nut member is released. At this time, the plunger moves in the housing in a direction away from the hose. For example, when the balloon is in an inflated state, the fluid is discharged from the balloon, and the balloon rapidly contracts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2004-525696 Summary of the Invention

[0005] A lever may be used as a mechanism for releasing the engagement between the threaded portion of the plunger and the threaded portion of the nut member. The lever applies a force to the nut member by rotating, disengaging the threaded portion of the plunger from the threaded portion of the nut member. For example, when the balloon is inflated by a fluid, a biasing force acts on the plunger, making it difficult for the threaded portion of the plunger to disengage from the threaded portion of the nut member. Therefore, when a user operates the lever to release the engagement, the user must operate the lever with a strong force, which reduces operability.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a pressure device which is easy to operate

[0007] The pressure application device according to the present invention is characterized in that it comprises a syringe having an internal storage section capable of storing a fluid; a plunger movable in a first direction relative to the syringe and discharging the fluid stored in the storage section to the outside of the syringe when moved in one direction in the first direction; a regulating member movable in a second direction intersecting the first direction between a separated position separated from the plunger and a contact position contacting the plunger; a lever that moves the regulating member from the contact position to the separated position in response to a rotational motion; and a rotation mechanism provided at a position overlapping with the regulating member in the second direction, which rotatably supports the lever relative to the regulating member, is movable in the second direction in response to rotation of the lever, and applies a force to the regulating member when moved in one direction in the second direction to move it from the contact position to the separated position.

[0008] When the lever is operated and rotated, the lever applies a force in one of the second directions to the regulating member, and can move the regulating member from the contact position to the separate position. In this case, the force required to operate the lever to move the regulating member from the contact position to the separate position is smaller than when the force applied by the lever to the regulating member is dispersed in a direction other than the one of the second directions. Therefore, the pressure device can improve the operability for the user.

[0009] In the present invention, the rotation mechanism may include a rotation shaft provided on one of the lever and the regulating member, and a support portion provided on the other of the lever and the regulating member and rotatably supported by the rotation shaft. The pressure device can increase the rigidity of the rotation mechanism, so that the movement of the regulating member in response to the lever operation by the user can be stably performed.

[0010] In the present invention, a biasing member may be provided that biases the regulating member from the separated position toward the contact position along the second direction. The biasing member can stably dispose the regulating member at the contact position when no lever operation is performed.

[0011] In the present invention, the biasing member may be a spring, which contracts when the regulating member is in the separated position, biases the regulating member toward the contact position, and expands when the regulating member is in the contact position. The pressure device can easily realize a mechanism for holding the regulating member at the contact position by using a spring.

[0012] In the present invention, the regulating member may be provided with a prevention mechanism for preventing the biasing member from shifting in position. Since the pressure device can stably bias the regulating member by the biasing member, the regulating member can be stably disposed at the contact position.

[0013] In the present invention, the plunger may include a gear, and the regulating member may include an internal gear that meshes with the gear when the regulating member is disposed at the contact position. When the regulating member is disposed at the contact position, the regulating member can appropriately suppress movement of the plunger in the first direction.

[0014] In the present invention, the gear of the plunger may be a helical gear, and the internal gear of the regulating member may be a helical internal gear. A user can move the plunger in a first direction by rotating the plunger with the regulating member disposed at the contact position.

[0015] In the present invention, a body may be provided that is connected to the syringe and has a through hole therein through which the plunger is inserted, and the regulating member may be supported by the body and may be movable between the contact position where the regulating member contacts the plunger inserted into the through hole and the separated position. In this case, the body can stabilize the position of the regulating member, so that the regulating member can appropriately regulate the movement of the plunger.

[0016] In the present invention, the body may have a first hole portion communicating with the through hole, and the regulating member may be movable between the contact position and the separated position by moving along the first hole portion. In this case, the pressure device can suppress rattling of the regulating member relative to the body, so that the force acting on the lever can be efficiently transmitted to the regulating member.

[0017] In the present invention, the body may further have a second hole extending from a side surface of the first hole along the first direction, and may further include a lever body having the lever, a protrusion provided at one end of the lever and accommodated in the second hole, and a part of the rotation mechanism located between the lever and the protrusion, and when the lever rotates, the protrusion moves in the first direction along the second hole, the rotation mechanism does not move in the first direction, and the lever body forms a lever with the lever as a force point, the protrusion as a fulcrum, and a part of the rotation mechanism as a point of action. In this case, the lever body can efficiently transmit the force acting on the lever to the regulating member to move the regulating member.

[0018] In addition, the housing of the pressurizing device described in the cited document 1 may be formed by combining a syringe with a body having a nut portion, etc. Here, when the pressurizing device is in use, a large pressure is applied inside the housing, and therefore a mechanism for firmly connecting the syringe and the body is required.

[0019] Another object of the present invention is to provide a pressurizing device capable of firmly connecting a syringe and a body.

[0020] A pressure device according to another aspect of the present invention comprises: A syringe having an internal storage portion capable of storing a fluid; a plunger that is movable in a first direction relative to the syringe and that ejects the fluid contained in the container to the outside of the syringe when the plunger moves in one direction of the first direction; A restricting member capable of restricting movement of the plunger; a body arranged on the other side of the syringe in the first direction and supporting the regulating member; a connecting mechanism that connects the syringe and the body; A pressure device comprising: The connecting mechanism includes: a base portion provided on one of the syringe and the body and extending toward the other of the syringe and the body along the first direction; an elastic portion that is a part of the base portion and extends from a base end to a tip end along a rotation direction centered on a center line that extends in the first direction along the plunger; a first protruding portion provided in a portion including the tip of the elastic portion, protruding in a radial direction based on the center line, and having a height in the radial direction that gradually increases from the base end toward the tip; an engagement portion provided on the other of the syringe and the body, the engagement portion being adapted to engage with the first protrusion; Equipped with With the engaging portion disposed on the same side as the base end with respect to the first protruding portion, the syringe and the body are rotated relatively in the rotation direction, and the engaging portion moves to the opposite side of the base end with respect to the first protruding portion, thereby connecting the syringe and the body. It is characterized by:

[0021] When the syringe and the body are connected, the first protrusion moves according to the elastic force of the elastic part, and the first protrusion engages with the engagement part. Therefore, the pressurizing device can firmly connect the syringe and the body by the connection mechanism without using adhesive or the like, thereby reducing the possibility that the adhesive or the like will be mixed into the liquid. Furthermore, the relative movement direction (rotation direction) of the syringe and the body in the process of connecting them is perpendicular to the direction in which the syringe and the body are arranged (first direction). Therefore, the pressurizing device can effectively suppress the syringe and the body from detaching from each other even if a force acting on the syringe and the body in a direction that moves them away from each other in the first direction acts on them. Therefore, the pressurizing device can maintain the state in which the syringe and the body are firmly connected for a long time.

[0022] In another aspect, a first end portion of the first protrusion adjacent to the engagement portion and a second end portion of the engagement portion adjacent to the first protrusion each have a flat surface extending along the radial direction, The first end and the second end are in contact with each other to restrict relative rotation between the syringe and the body.

[0023] In this case, the first end and the second end are in contact with each other over a wide area of ​​the plane, restricting rotation of the body relative to the syringe. Therefore, the pressurizing device can stably maintain the state in which the syringe and the body are connected, thereby suppressing the occurrence of dimensional errors between individual syringes.

[0024] In another aspect, the linkage comprises: A second protruding portion protruding in the radial direction from the base portion, the second protruding portion having a protrusion protruding in the radial direction at an end portion opposite the base portion; a groove portion provided on the other of the syringe and the body, into which the second protrusion portion fits; The present invention is characterized by having the following.

[0025] In this case, the protrusion can stabilize the radial position of the second protrusion in the groove even if slight irregularities are formed at the bottom of the groove or at the tip of the second protrusion, etc. Therefore, the pressurizing device can eliminate dimensional errors between the syringe and the body by the protrusion. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a perspective view of the pressure device 1. [Diagram 2] FIG. 2 is an exploded perspective view of the pressure device 1. [Diagram 3] FIG. 2 is an exploded side view of the pressure device 1. [Figure 4] FIG. 2 is an enlarged perspective view of the syringe 2. [Diagram 5] FIG. [Figure 6] 2 is a cross-sectional view (before connection) taken along line AA in FIG. 1, seen from the direction of the arrow. [Figure 7] 2 is a cross-sectional view (after connection) taken along line AA in FIG. 1, seen from the direction of the arrow. [Figure 8] 2 is an exploded perspective view of the body 3, the regulating body 5A, and the lever body 6. FIG. [Figure 9] FIG. 13 is a view of a regulation body 5A as seen from the base end side. [Figure 10] FIG. 13 is a right side view of the regulator 5A. [Figure 11] FIG. [Figure 12] 1 is a cross-sectional view of a pressure device 1 including a regulating body 5A disposed at a contact position. [Figure 13] 1 is a cross-sectional view of a pressure device 1 including a regulating body 5A disposed at a distant position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] A description will be given of a pressure application device 1 according to one embodiment of the present invention. In the following description, the upper side, lower side, upper left diagonal side, lower right diagonal side, lower left side, and upper right side in Fig. 1 are defined as the upper side, lower side, left side, right side, tip side, and base side of the pressure application device 1, respectively. The direction extending from the tip side to the base side is defined as the extension direction.

[0028] <Outline of the pressure device 1> The pressurizing device 1 is, for example, an indeflator, and can be used to expand / contract a balloon (not shown) used to expand a stenotic portion. As shown in Figs. 1 to 3, the pressurizing device 1 includes a syringe 2, a body 3, a plunger 4, a regulating body 5A (see Fig. 3), a biasing member 5B (see Fig. 3), and a lever body 6. The pressurizing device 1 pumps the fluid contained in the syringe 2 into the balloon via the catheter to expand the balloon. The plunger 4 is operated when pumping the fluid from the syringe 2. The pressurizing device 1 can also release the fluid from inside the balloon in response to an operation on the lever body 6 supported by the body 3, thereby contracting the balloon.

[0029] <Syringe 2> The syringe 2 has a cylindrical body 21, a flange 22, a connection port 23, a pressure gauge connection port 24, and a connecting portion 26 (see Figs. 2 and 3). The cylindrical body 21 is a transparent member having a cylindrical shape. The base end of the cylindrical body 21 is open. The cylindrical body 21 has an internal storage portion 20 capable of storing a fluid. An imaginary line that passes through the center of the cylindrical body 21 and extends in the extension direction is called a center line C. A scale is provided on the side of the cylindrical body 21 to visually confirm the volume of the fluid stored in the storage portion 20.

[0030] The flange 22 is provided at the base end of the cylindrical body 21 and protrudes outward. As shown in FIG. 2 and FIG. 3, a connecting portion 26 for connecting the syringe 2 and the body 3 is provided on the surface of the base end side of the flange 22. The details of the connecting portion 26 will be described later. As shown in FIG. 1 to FIG. 3, the connection port 23 is provided at the tip end of the cylindrical body 21. The connection port 23 has a cylindrical shape with a diameter smaller than that of the cylindrical body 21. The connection port 23 extends from the tip end of the cylindrical body 21 toward the tip side along the center line C. One end of a resin tube (not shown) is connected to the connection port 23. A three-way cock is connected to the other end of the resin tube, and a catheter (not shown) connected to a balloon is connected to the other end of the three-way cock. The pressure gauge connection port 24 is provided on the side surface of the cylindrical body 21 near the tip end. A pressure gauge (not shown) for measuring the pressure of the fluid contained in the container 20 is connected to the pressure gauge connection port 24.

[0031] <Connection part 26> As shown in FIG. 4, the connecting portion 26 has connecting bodies 26A and 26B. The shapes of the connecting bodies 26A and 26B have a point-symmetric relationship with respect to the center line C as the center of rotation. The connecting body 26A has a base 81 and protruding parts 82, 83, and 84. The connecting body 26B has a base 86 and protruding parts 87, 88, and 89. In the following, unless otherwise specified, the connecting portion 26 is assumed to be viewed from the tip side (the state of FIG. 6 and FIG. 7), and the rotation direction (clockwise direction / counterclockwise direction) around the center line C is defined. Also, the connecting body 26A will be described in detail, and the description of the connecting body 26B will be simplified.

[0032] The base 81 has a curved plate shape and extends from the surface of 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 part of each part obtained by dividing a cylinder extending in the extension direction along the center line C in the up-down direction. The base 81 is curved in a convex shape toward the upper side. Both ends of the base 81 in the circumferential direction are called ends 811 and 812. As shown in Figures 6 and 7, the direction from the end 811 to the end 812 along the base 81 is the counterclockwise direction. The protrusions 82, 83, and 84 are provided on the outer surface of the base 81. The protrusions 82, 83, and 84 are arranged in this order in the counterclockwise direction. The protrusion 84 is provided at the end 812 of the base 81.

[0033] As shown in FIG. 4, the protrusion 82 is slightly spaced from the end 811 in the counterclockwise direction. The protrusion 82 has a pair of protrusions 820 each having a plate shape. The pair of protrusions 820 protrude from the outer surface of the base 81 in the radial direction centered on the center line C. The pair of protrusions 820 have almost the same shape and are spaced apart in the extension direction. As shown in FIG. 6, the end 821 of the pair of protrusions 820 that is close to the end 811 in the rotation direction extends parallel to the radial direction centered on the center line C. The end 822 of the pair of protrusions 820 that is close to the end 812 in the rotation direction is inclined with respect to the radial direction centered on the center line C. The height of the pair of protrusions 820 increases in the clockwise direction at the position of the end 822. A pair of protrusions 82P that protrude in the radial direction is provided at the radial tip 823 of each of the pair of protrusions 820. The pair of protrusions 82P extend in the extension direction and are spaced apart in the rotation direction.

[0034] As shown in FIG. 4, the protrusion 83 is slightly spaced from the end 812 in the clockwise direction. The protrusion 83 has a pair of protrusions 830 each having a plate shape, similar to the protrusion 82. The pair of protrusions 830 protrude from the outer surface of the base 81 in the radial direction centered on the center line C. The pair of protrusions 830 have almost the same shape and are spaced apart in the extension direction. As shown in FIG. 6, the end 832 of the pair of protrusions 830 that is close to the end 812 in the rotation direction extends parallel to the radial direction centered on the center line C. The end 831 of the pair of protrusions 830 that is close to the end 811 in the rotation direction is inclined with respect to the radial direction centered on the center line C. The height of the pair of protrusions 830 increases in the counterclockwise direction at the position of the end 831. A pair of protrusions (not shown) having the same shape as the pair of protrusions 82P of the protrusion 82 is provided at the tip of each of the pair of protrusions 830.

[0035] As shown in FIG. 4, the protruding portion 84 protrudes in a radial direction centered on the center line C at an end 812 of the base portion 81. The end 812 has a planar shape and is perpendicular to the rotation direction. As shown in FIG. 6, an end 841 of the protruding portion 84 opposite to the end 812 in the rotation direction is inclined with respect to the radial direction centered on the center line C. The radial length (height) of the protruding portion 84 increases in the counterclockwise direction at the position of the end 841. As shown in FIG. 4, the base portion 81 is provided with a slit 813 extending in a clockwise direction from the end 812. A portion of the base portion 81 on the base end side of the slit 813 is referred to as an elastic portion 810. The elastic portion 810 extends in the rotation direction. The elastic portion 810 is elastically deformable in a radial direction centered on the center line C. The protruding portion 84 is formed at the tip of the elastic portion 810.

[0036] As shown in FIG. 4, the base 86 is curved downward in a convex shape. Ends 861, 862 and protrusions 87, 88, 89 of the base 86 correspond to ends 811, 812 and protrusions 82, 83, 84 of the base 81, respectively. A pair of protrusions 870, end 871, end 872, and a pair of protrusions (not shown) of the protrusion 87 correspond to a pair of protrusions 820, end 821, end 822, and a pair of protrusions 82P of the protrusion 82, respectively. A pair of protrusions 880, end 881, end 882, and a pair of protrusions 88P of the protrusion 88 correspond to a pair of protrusions 830, end 831, end 832, and a pair of protrusions (not shown) of the protrusion 83, respectively. An end 891 of the protrusion 89 corresponds to an end 841 of the protrusion 84. The slits 863 and the elastic portion 860 of the base 86 correspond to the slits 813 and the elastic portion 810 of the base 81, respectively.

[0037] <Body 3> As shown in Figs. 1 to 3, the body 3 is located on the base end side of the syringe 2, and has a base 31, a flange 32, and a connecting portion 36 (see Fig. 2). The base 31 has a substantially cylindrical shape and extends along a center line C. As shown in Fig. 5, the base 31 is formed with a through hole 30 extending along the center line C. The through hole 30 extends between the base end and the tip end of the base 31, penetrating the base 31. A plunger 4 (see Fig. 3), which will be described later, is inserted into the through hole 30.

[0038] A first hole 33 recessed downward is formed in the side surface of the base 31 near the tip. The opening of the first hole 33 has a rectangular shape and is formed at the upper end of the base 31. The first hole 33 communicates with the through hole 30 and extends below the through hole 30 (see Figs. 12 and 13). The bottom surface of the first hole 33 is located below the through hole 30. As shown in Fig. 8, the first hole 33 accommodates a regulating body 5A, a biasing member 5B, and a part of the lever body 6 described below. As shown in Fig. 5, a second hole 34 recessed toward the tip is formed in a part of the inner side surface of the tip side of the first hole 33 near the upper end. The second hole 34 extends toward the tip. A part of the lever body 6 (see Figs. 1 to 3) is accommodated in the second hole 34.

[0039] 1 to 3, the flange 32 is provided at the tip of the base 31. As shown in Fig. 2, the flange 32 has a cylindrical shape and the tip is open. A connecting portion 36 for connecting the body 3 and the syringe 2 is provided on the inner surface of the flange 32.

[0040] <Connection part 36> 5, the coupling portion 36 has engagement portions 92, 93, 94, 97, 98, and 99. The engagement portions 92, 93, 94, 97, 98, and 99 are provided on the inner surface of the flange 32. The engagement portions 92, 93, 94, 97, 98, and 99 are arranged in this order in the counterclockwise direction.

[0041] As shown in FIG. 5, the engagement portions 92, 93, 97, and 98 each protrude inward from the inner surface of the flange 32. The engagement portion 97 is provided with a pair of grooves 970 extending in the clockwise direction from an end 972 adjacent to the engagement portion 98. The pair of grooves 970 extend parallel to each other and spaced apart in the extension direction. The engagement portion 92 is provided with a pair of grooves 920 extending in the clockwise direction from an end 922 adjacent to the engagement portion 93, similar to the engagement portion 97. The pair of grooves 920 extend parallel to each other and spaced apart in the extension direction. The engagement portion 93 is provided with a pair of grooves 930 extending between both ends in the clockwise direction. The pair of grooves 930 extend parallel to each other and spaced apart in the extension direction. The engagement portion 98 is provided with a pair of grooves 980 extending between both ends in the clockwise direction. The pair of grooves 980 extend parallel to each other and are spaced apart from each other in the extension direction.

[0042] The engaging portion 94 has an end 941 adjacent to the engaging portion 93 and an end 942 adjacent to the engaging portion 97. The end 941 extends from the inner surface of the flange 32 toward the center line C in the radial direction. The end 941 has a planar shape and is perpendicular to the rotation direction. The end 942 extends from the inner surface of the flange 32 toward the center line C in a direction inclined with respect to the radial direction. The height of the engaging portion 94 increases in the clockwise direction at the position of the end 942. The engaging portion 99 has an end 991 adjacent to the engaging portion 98 and an end 992 adjacent to the engaging portion 92. The end 991 extends from the inner surface of the flange 32 toward the center line C in the radial direction. The end 992 extends from the inner surface of the flange 32 toward the center line C in a direction inclined with respect to the radial direction. The height of the engaging portion 99 increases in the clockwise direction at the position of the end 992.

[0043] <Method of connecting the syringe 2 and the body 3> The syringe 2 and the body 3 are connected in a process of assembling the pressurizing device 1. The syringe 2 and the body 3 are connected by connecting portions 26, 36. A method of connecting the syringe 2 and the body 3 will be described below.

[0044] The syringe 2 and the body 3 are arranged in a state separated from each other in the extension direction. The syringe 2 is arranged on the tip side, and the body 3 is arranged on the base end side. Next, the syringe 2 and the body 3 are brought close to each other. At this time, as shown in FIG. 6 , the protruding portion 82 of the syringe 2 fits between the engaging portions 92, 93 of the body 3. The protruding portion 83 of the syringe 2 fits between the engaging portions 93, 94 of the body 3. The protruding portion 84 of the syringe 2 fits between the engaging portions 94, 97 of the body 3. The protruding portion 87 of the syringe 2 fits between the engaging portions 97, 98 of the body 3. The protruding portion 88 of the syringe 2 fits between the engaging portions 98, 99 of the body 3. The protruding portion 89 of the syringe 2 fits between the engaging portions 99, 92 of the body 3.

[0045] In this state, the syringe 2 is rotated clockwise relative to the body 3. At this time, as shown in Fig. 7, the pair of protrusions 820 of the protrusion 82 of the syringe 2 enter into the pair of grooves 920 (see Fig. 5) of the engagement portion 92 of the body 3. The pair of protrusions 830 (see Fig. 4) of the protrusion 83 of the syringe 2 enter into the pair of grooves 930 (see Fig. 5) of the engagement portion 93 of the body 3. The pair of protrusions 870 of the protrusion 87 of the syringe 2 enter into the pair of grooves 970 (see Fig. 5) of the engagement portion 97 of the body 3. The pair of protrusions 880 (see Fig. 4) of the protrusion 88 of the syringe 2 enter into the pair of grooves 980 (see Fig. 5) of the engagement portion 98 of the body 3.

[0046] Also, the end 841 of the protruding portion 84 of the syringe 2 comes into contact with the end 942 of the engaging portion 94 of the body 3. The protruding portion 84 of the syringe 2 moves inward due to the elastic deformation of the elastic portion 810, and passes through the engaging portion 94 of the body 3 in a clockwise direction. After the protruding portion 84 of the syringe 2 passes through the engaging portion 94 of the body 3, the elastic portion 810 returns to its original state due to the elastic force. The end 812 of the syringe 2 comes into contact with the end 941 of the engaging portion 94 of the body 3. Similarly, the end 891 of the protruding portion 89 of the syringe 2 comes into contact with the end 992 of the engaging portion 99 of the body 3. The protruding portion 89 of the syringe 2 moves inward due to the elastic deformation of the elastic portion 860, and passes through the engaging portion 99 of the body 3 in a clockwise direction. After the protruding portion 89 of the syringe 2 passes through the engaging portion 99 of the body 3, the elastic portion 860 returns to its original state due to the elastic force. The end 862 of the syringe 2 comes into contact with the end 991 of the engagement portion 99 of the body 3. Here, the ends 812, 862 of the syringe 2 and the ends 941, 991 of the body 3 all extend in a radial direction centered on the center line C. For this reason, in a state in which the end 812 of the syringe 2 comes into contact with the end 941 of the body 3 and the end 862 of the syringe 2 comes into contact with the end 991 of the body 3, counterclockwise rotation of the syringe 2 relative to the body 3 is suppressed. As a result, the syringe 2 and the body 3 are connected to each other and cannot be detached.

[0047] <Regulation body 5A, biasing member 5B> As shown in FIG. 3 and FIG. 8, the regulating body 5A is supported by the body 3 through the first hole portion 33 in a state where it is accommodated in the first hole portion 33 of the body 3. The regulating body 5A is movable in the up and down direction with respect to the body 3. As shown in FIG. 8, FIG. 9, and FIG. 10, the regulating body 5A has a regulating member 51, a rib 52, and a rotating shaft 53. As shown in FIG. 9, the regulating member 51 has a substantially U-shape. The regulating member 51 has a recess 54 recessed downward from the upper end. The bottom of the recess 54 is curved in an arc shape. The curvature of the bottom of the recess 54 is equal to the curvature of the through hole 30 of the body 3 (see FIG. 8). In a state where the regulating body 5A is accommodated in the first hole portion 33 of the body 3, a part of the recess 54 of the regulating body 5A and the through hole 30 of the body 3 overlap in the extension direction (see FIG. 12 and FIG. 13). A helical internal gear 50 is formed in the curved part of the bottom of the recess 54.

[0048] The rib 52 protrudes downward from the lower end of the regulating member 51. The lower end of the rib 52 is provided with a notch 520 that is cut upward. A recess 52A that is recessed toward the tip side is formed on the surface of the base end side of the rib 52 (see FIG. 8). The upper end of the recess 52A is covered by the lower end of the regulating member 51. The lower end of the recess 52A is open. The rotating shaft 53 is connected to the upper ends of a pair of protruding parts 51A that protrude upward from the upper end of the regulating member 51. The rotating shaft 53 has a cylindrical shape and extends in the left-right direction between the pair of protruding parts 51A. Both left and right ends of the rotating shaft 53 protrude outward from the pair of protruding parts 51A.

[0049] As shown in FIG. 8, the biasing member 5B is a compression coil spring. The biasing member 5B is housed in a recess 52A formed in a rib 52 of the regulating body 5A in a vertically expandable and contractible orientation. The rib 52 suppresses misalignment of the biasing member 5B in the horizontal direction. As shown in FIG. 12 and FIG. 13, an upper end of the biasing member 5B contacts the regulating member 51 of the regulating body 5A from below. A lower end of the biasing member 5B contacts the bottom surface of the first hole portion 33 of the body 3 from above. The biasing member 5B biases the regulating body 5A upward.

[0050] <Lever body 6> As shown in FIG. 1 and FIG. 2, the lever body 6 is rotatably supported at the upper end of the body 3 near the tip of the base 31. As shown in FIG. 8 and FIG. 11, the lever body 6 has a lever 61, a protruding portion 62, and a support portion 63. The support portion 63 is located between the lever 61 and the protruding portion 62. The support portion 63 has a through hole 60A penetrating between both the left and right side surfaces, and a communication portion 60B extending downward from the through hole 60A. The through hole 60A and the groove portion 60 are integrated to form the groove portion 60 on the lower surface of the support portion 63. The protruding portion 62 protrudes from the side surface on the base end side of the support portion 63 toward the base end side. The corner of the tip of the protruding portion 62 is curved. The lever 61 has a long and slender curved plate shape. The lever 61 extends from the upper side surface of the support portion 63 toward the tip side while inclining upward.

[0051] As shown in FIG. 12 and FIG. 13, the support portion 63 of the lever body 6 is rotatably supported by the rotation shaft 53 of the regulating body 5A by fitting the rotation shaft 53 into the groove portion 60. The positions of the regulating body 5A, the rotation shaft 53, and the support portion 63 overlap in the vertical direction. The lever 61 is rotatably supported by the regulating body 5A by the support portion 63. The rotation center of the lever body 6 coincides with the rotation shaft 53 arranged in the through hole 60A of the groove portion 60. The position of the rotation shaft 53 moves in response to the regulating body 5A moving in the vertical direction within the first hole portion 33. That is, the rotation center of the lever body 6 moves in the vertical direction in response to the movement of the regulating body 5A. The moving direction of the rotation center of the lever body 6 coincides with the movable direction of the regulating body 5A. The protrusion portion 62 of the lever body 6 enters the second hole portion 34 of the body 3 from the tip side. The position of the tip of the protrusion 62 is movable in the extension direction in response to the rotation of the lever body 6 .

[0052] <Plunger 4> As shown in Fig. 3, the plunger 4 has a rod body 41, a knob 42, and a gasket 43. The rod body 41 has a cylindrical shape and extends in the extension direction along the center line C. The diameter of the rod body 41 is approximately the same as the diameter of the through hole 30 (see Fig. 8) of the body 3. The curvature of the rod body 41 is the same as the curvature of the bottom of the recess 54 of the regulating body 5A. A helical gear 40 is formed on the peripheral wall of the rod body 41.

[0053] The knob 42 is provided at the base end of the rod body 41. As shown in Figs. 1 and 2, the knob 42 has a plate shape and is perpendicular to the extension direction. The end of the knob 42 is curved in a wavy shape. The knob 42 is grasped when the user rotates the plunger 4. As shown in Figs. 2 and 3, the gasket 43 is provided at the tip of the rod body 41. The gasket 43 is made of rubber and is larger in diameter than the rod body 41. The gasket 43 is provided to improve adhesion with the storage section 20 of the syringe 2.

[0054] The plunger 4 is supported by the body 3 with the rod body 41 inserted through the through hole 30 of the body 3. The rod body 41 passes through the inside of the recess 54 of the regulating member 51 housed in the first hole portion 33 of the body 3 in the extension direction. The knob 42 is located on the base end side of the body 3. The gasket 43 is located on the tip side of the body 3 and within the housing portion 20 of the syringe 2. The plunger 4 is movable in the extension direction relative to the syringe 2, the body 3, and the regulating body 5A. When the plunger 4 moves to the tip side, the fluid housed in the housing portion 20 is discharged to the outside through the connection port 23 of the syringe 2.

[0055] <Movement of the Restriction Member 51 by Operation of the Lever 61> The regulating member 51 receives an upward biasing force from the biasing member 5B. As shown in FIG. 12, when no external force is acting on the lever 61 of the lever body 6, the regulating member 51 moves upward in response to the biasing force received from the biasing member 5B. At this time, the bottom of the recess 54 of the regulating member 51 comes into contact with a part of the rod body 41 of the plunger 4 from below. A part of the helical gear 40 of the rod body 41 meshes with the helical internal gear 50. The biasing member 5B extends. Hereinafter, the position of the regulating member 51 when the bottom of the recess 54 comes into contact with a part of the rod body 41 of the plunger 4 (the position shown in FIG. 12) is referred to as the contact position.

[0056] When a downward external force acts on the lever 61 of the lever body 6, the lever body 6 rotates counterclockwise around the rotation shaft 53 as viewed from the right side. As shown in FIG. 13, the protrusion 62 of the lever body 6 rotates around the rotation shaft 53 and moves upward in the second hole 34 of the body 3. The upward movement of the protrusion 62 is restricted by the protrusion 62 contacting the upper side of the inner surface of the second hole 34 from below. At this time, the lever body 6 forms a second type lever with the lever 61 as the force point, the support portion 63 as the action point, and the protrusion 62 as the fulcrum. Therefore, the downward force acting on the lever 61 acts on the support portion 63, moving the support portion 63 and the rotation shaft 53 downward. As a result, the restricting member 51 receives a downward force against the biasing force of the biasing member 5B. The restricting member 51 moves downward with respect to the contact position.

[0057] Since the protrusion 62 of the lever body 6 is not fixed to the body 3, when the lever 61 rotates, the protrusion 62 moves slightly toward the base end along the second hole 34. However, the positions of the rotation shaft 53 of the regulating body 5A and the support part 63 supported by the rotation shaft 53 do not move in the extension direction, but only in the vertical direction. Therefore, the force transmitted from the lever 61 to the regulating member 51 via the support part 63 and the rotation shaft 53 acts straight downward, and does not act in a direction inclined relative to the downward direction.

[0058] As the regulating member 51 moves downward, the bottom of the recess 54 of the regulating member 51 moves downward away from a portion of the rod body 41 of the plunger 4. The meshing state between the portion of the helical gear 40 of the rod body 41 and the helical internal gear 50 is released. The biasing member 5B contracts. Hereinafter, the position of the regulating member 51 when the bottom of the recess 54 is separated from the portion of the rod body 41 of the plunger 4 (the position shown in FIG. 13) is referred to as the separated position.

[0059] <How to use> A user connects the base end of a catheter having a balloon at its tip to the connection port 23 of the syringe 2. A fluid for expanding the balloon is previously stored in the storage section 20 of the cylindrical body 21 of the syringe 2. When no external force is acting on the lever 61, the regulating member 51 moves upward in response to the biasing force of the biasing member 5B and is located at the contact position. The helical internal gear 50 of the regulating member 51 meshes with a part of the helical gear 40 of the rod body 41 of the plunger 4. Therefore, the movement of the plunger 4 in the extension direction is regulated by the regulating member 51.

[0060] The user grasps knob 42 of plunger 4 and rotates it. Rod body 41 rotates with part of helical gear 40 meshing with helical internal gear 50 of regulating member 51, so that rod body 41 moves toward the tip side. Gasket 43 of plunger 4 pushes the fluid contained in storage section 20 of syringe 2 to the outside via connection port 23. The fluid pushed out from syringe 2 flows into the balloon via the catheter. This causes the balloon to expand and treat the affected area. The user can control the pressure of the fluid flowing into the balloon by adjusting the amount of rotation of knob 42 of plunger 4.

[0061] As the plunger 4 moves toward the tip end and the pressure of the fluid increases, a force toward the base end acts on the plunger 4. However, the regulating member 51 is in the contact position, and the helical internal gear 50 of the regulating member 51 meshes with a part of the helical gear 40 of the rod body 41 of the plunger 4. Therefore, the movement of the plunger 4 toward the base end is regulated by the regulating member 51.

[0062] After the treatment of the affected area by expanding the balloon is completed, the user grips the lever 61 and applies a downward external force. The lever body 6 rotates around the rotation axis 53, moving the support part 63 and the rotation axis 53 downward. The restricting member 51 receives a downward force against the biasing force of the biasing member 5B and moves from the contact position to the separated position. The state in which a part of the helical gear 40 of the rod body 41 of the plunger 4 and the helical internal gear 50 are no longer meshed is released. The plunger 4 receives pressure from the fluid in the storage part 20 of the syringe 2 and moves toward the base end. The fluid pressure decreases and the fluid is released from the balloon. This causes the balloon to rapidly contract.

[0063] <Actions and Effects of the Present Embodiment> When the lever body 6 is rotated by the user, the lever 61 applies a downward force to the regulating member 51, and can move the regulating member 51 from the contact position to the separated position. Here, the protruding portion 62 of the lever body 6 is not fixed to the body 3. In addition, the support portion 63 of the lever body 6, the regulating member 51 of the regulating body 5A, and the rotating shaft 53 are arranged to overlap in the vertical direction. Therefore, the lever 61 can apply a downward force to the regulating member 51 without changing the position in the extension direction of the rotating shaft 53. In this case, the force required to operate the lever 61 to move the regulating member 51 from the contact position to the separated position is smaller than when the force applied by the lever 61 to the regulating member 51 is distributed in a direction other than downward. Therefore, the pressure device 1 can improve the operability of the user.

[0064] When the knob 42 of the plunger 4 is rotated to release the fluid from the syringe 2 into the balloon and expand the balloon, the pressure of the fluid increases. This pressure exerts a force on the plunger 4 in a direction toward the base end side. Therefore, a part of the helical gear 40 of the rod body 41 of the plunger 4 is strongly pressed against the helical internal gear 50 of the regulating member 51 at the contact position. Therefore, the regulating member 51 is in a state in which it is difficult to move from the contact position to the separated position. In response to this, the user operates the lever 61 in this state to move the regulating member 51 from the contact position to the separated position, thereby making it possible to move the plunger 4 toward the base end side. At this time, the lever body 6 can efficiently transmit the downward force on the lever 61 to the regulating member 51. Therefore, the user can suppress the force required to operate the lever 61. Therefore, the user can easily perform an operation to switch the pressurizing device 1 from a state in which the movement of the plunger 4 toward the base end side is restricted to a state in which the movement toward the base end side is possible by operating the lever 61.

[0065] In the pressure application device 1, the restricting member 51 is provided with a rotating shaft 53, and the lever 61 is provided with a supporting portion 63. In this case, the pressure application device 1 can increase the rigidity of the rotating shaft 53 and the supporting portion 63 compared to a case in which the restricting member 51 and the rotating shaft 53 are separate bodies, or the lever 61 and the supporting portion 63 are separate bodies. Therefore, the pressure application device 1 can stably move the restricting member 51 in response to the operation of the lever 61 by the user.

[0066] The pressure applying device 1 includes a biasing member 5B that biases the restricting member 51 upward from the separated position toward the contact position. The biasing member 5B can stably position the restricting member 51 at the contact position when the lever 61 is not operated.

[0067] The biasing member 5B can stably hold the restricting member 51 at the contact position. Therefore, the pressurizing device 1 can stably maintain a state in which the restricting member 51 arranged at the contact position restricts the movement of the plunger 4 toward the base end side. Therefore, the user can easily maintain a state in which the balloon is expanded by the fluid discharged from the storage portion 20 of the syringe 2 as a result of the plunger 4 moving toward the tip end side.

[0068] The biasing member 5B is a compression coil spring. The biasing member 5B contracts when the regulating member 51 is in the separated position, and biases the regulating member 51 toward the contact position. On the other hand, the biasing member 5B expands when the regulating member 51 is in the contact position. In the pressure device 1, the biasing member for holding the regulating member 51 at the contact position can be easily realized by a spring.

[0069] The restricting member 51 is provided with a rib 52 for preventing the biasing member 5B from shifting in position. In this case, the pressure device 1 can stably bias the restricting member 51 by the biasing member 5B, so that the restricting member 51 can be stably disposed at the contact position.

[0070] The plunger 4 has a helical gear 40, and the regulating member 51 has a helical internal gear 50. In this case, the regulating member 51 can appropriately suppress the movement of the plunger 4 toward the base end side when the regulating member 51 is arranged at the contact position. Also, the user can move the plunger 4 toward the tip end side by rotating the plunger 4 when the regulating member 51 is arranged at the contact position.

[0071] The body 3 of the pressurizing device 1 supports the regulating body 5A so as to be movable in the vertical direction. In this case, the body 3 can stabilize the position of the regulating body 5A in the extension direction of the regulating member 51, so that the regulating member 51 can appropriately regulate the movement of the plunger 4. Moreover, the regulating body 5A moves between the contact position and the separated position by moving in the vertical direction along the first hole portion 33 of the body 3. In this case, the pressurizing device 1 can suppress rattling of the regulating body 5A relative to the body 3 in the extension direction, so that the force acting on the lever 61 can be efficiently transmitted to the regulating body 5A.

[0072] The lever body 6 forms a second type lever with the lever 61 as the force point, the protrusion 62 as the fulcrum, and the support portion 63 as the point of action. When the lever body 6 rotates, the protrusion 62 moves slightly toward the base end along the second hole portion 34 of the body 3. Meanwhile, the rotation shaft 53 of the regulating body 5A and the support portion 63 of the lever body 6 do not move in the extension direction. In this case, the lever body 6 efficiently transmits the vertical force acting on the lever 61 to the regulating member 51, and can move the regulating member 51 in the vertical direction.

[0073] The connecting portion 26 of the syringe 2 has a protrusion 84 provided on the elastic portion 810 and a protrusion 89 provided on the elastic portion 860. The connecting portion 36 of the body 3 has engagement portions 94, 99. The protrusion 84 moves inward as the elastic portion 810 elastically deforms, and passes through the engagement portion 94 in a clockwise direction. Thereafter, the elastic portion 810 returns to its original state due to an elastic force, and the end 812 of the protrusion 84 comes into contact with the end 941 of the engagement portion 94. In addition, the protrusion 89 moves inward as the elastic portion 860 elastically deforms, and passes through the engagement portion 99 in a clockwise direction. Thereafter, the elastic portion 860 returns to its original state due to an elastic force, and the end 862 of the protrusion 84 comes into close contact with the end 991 of the engagement portion 99 of the body 3. Therefore, in the pressurizing device 1, the syringe 2 and the body 3 can be firmly connected by the connecting parts 26, 36 without using adhesive or the like, so that the possibility of the adhesive or the like being mixed into the liquid inside the syringe can be reduced.

[0074] When the syringe 2 is operated to push out the fluid contained in the storage section 20, a force acts on the syringe 2 and the body 3 in a direction moving them away from each other along the extension direction. In contrast, the relative movement direction (rotation direction about the center line C) of the syringe 2 and the body 3 in the process of connecting them is perpendicular to the extension direction, which is the arrangement direction of the syringe 2 and the body 3. Therefore, even if a force repeatedly acts on the syringe 2 and the body 3 in a direction moving them away from each other, the pressurizing device 1 can effectively suppress the syringe 2 and the body 3 from detaching from each other. Therefore, the pressurizing device 1 can maintain the state in which the syringe 2 and the body 3 are firmly connected for a long period of time.

[0075] The ends 812, 862 of the protrusions 84, 89 and the ends 941, 991 of the body 3 all have a planar shape and extend in a radial direction centered on the center line C. Therefore, when the end 812 of the syringe 2 and the end 941 of the body 3 are in contact with each other and the end 862 of the syringe 2 and the end 991 of the body 3 are in contact with each other, the counterclockwise rotation of the syringe 2 relative to the body 3 is suppressed. The ends 812, 862 of the protrusions 84, 89 and the ends 941, 991 of the body 3 are in contact with each other over a wide planar area, and the rotation of the body 3 relative to the syringe 2 can be restricted. Therefore, the pressurizing device 1 can stably maintain the state in which the syringe 2 and the body 3 are connected to each other, and thus the occurrence of dimensional errors for each individual syringe can be suppressed.

[0076] The protrusions 82, 83, 87, 88 of the connecting portion 26 each have a pair of protrusions 82P, 88P, etc. protruding in the radial direction at a radial tip 823, 883, etc. The pair of protrusions 82P, 88P, etc. contact the bottom of the groove 920, 930, 970, 980 when the protrusions 82, 83, 87, 88 enter the groove 920, 930, 970, 980 of the body 3. The pair of protrusions 82P, 88P, etc. can stabilize the radial position of the protrusions 82, 83, 87, 88 in the groove 920, 930, 970, 980 even when slight irregularities are formed at the bottom of the groove 920, 930, 970, 980 or at the tip 823, 883, etc. of the protrusions 82, 83, 87, 88. Therefore, the pressurizing device 1 can eliminate the dimensional error between the syringe 2 and the body 3 by the pair of protrusions 82P, 88P.

[0077] <Modification> The present invention is not limited to the above-described embodiment, and various modifications are possible. The syringe 2 and the body 3 may be inseparable. In other words, the syringe 2 and the body 3 may be provided integrally.

[0078] Instead of the regulating body 5A, the lever body 6 may include the rotation shaft 53. For example, the rotation shaft 53 may be provided on the lever 61. Instead of the lever body 6, the regulating body 5A may include a support portion 63. A rotation mechanism including the rotation shaft 53 and the support portion 63 may be provided separately from the regulating body 5A and the lever body 6.

[0079] A locking mechanism may be provided to hold the regulating member 51 at each of the contact position and the separation position. For example, the locking mechanism may hold the position of the lever 61 in a state where the regulating member 51 is located at each of the contact position and the separation position. In this case, the pressure device 1 does not need to include the biasing member 5B.

[0080] The biasing member 5B is not limited to a compression coil spring, and may be another member having elasticity. For example, the biasing member 5B may be a rubber piece or the like. The rib 52 may be provided on the bottom surface of the first hole portion 33 of the body 3. The rib 52 may be formed in a rod shape that passes through the center of the compression coil spring, which is the biasing member 5B.

[0081] The plunger 4 and the regulating member 51 may not have gears. For example, the regulating member 51 may regulate the movement of the plunger 4 toward the base end side by a frictional force generated in response to contact between the plunger 4 and the rod body 41 when the regulating member 51 is in the contact position.

[0082] <Other> The stretching direction is an example of a "first direction" of the present invention. The tip side is an example of a "first direction" of the present invention. The base side is an example of a "second direction" of the present invention. The support portion 63 and the rotating shaft 53 are an example of a "rotating mechanism" of the present invention. The rib 52 is an example of a "prevention mechanism" of the present invention.

Claims

1. A syringe having an internal storage portion capable of storing a fluid; a plunger that is movable in a first direction relative to the syringe and that ejects the fluid contained in the container to the outside of the syringe when the plunger moves in one direction of the first direction; A restricting member capable of restricting movement of the plunger; a body arranged on the other side of the syringe in the first direction and supporting the regulating member; a connecting mechanism that connects the syringe and the body; A pressure device comprising: The connecting mechanism includes: a base portion provided on one of the syringe and the body and extending toward the other of the syringe and the body along the first direction; an elastic portion that is a part of the base portion and extends from a base end to a tip end in a rotation direction around a center line that extends in the first direction along the plunger; a first protruding portion provided in a portion including the tip of the elastic portion, protruding in a radial direction based on the center line, and having a height in the radial direction that gradually increases from the base end toward the tip; an engagement portion provided on the other of the syringe and the body, the engagement portion being adapted to engage with the first protrusion; Equipped with With the engaging portion disposed on the same side as the base end with respect to the first protruding portion, the syringe and the body are rotated relatively in the rotation direction, and the engaging portion moves to the side opposite the base end with respect to the first protruding portion, thereby connecting the syringe and the body. A pressure applying device characterized by:

2. A first end of the first protrusion adjacent to the engaging portion, and a second end of the engaging portion adjacent to the first protrusion each have a plane extending along the radial direction, The pressurizing device according to claim 1 , wherein the first end and the second end are in contact with each other to restrict relative rotation between the syringe and the body.

3. The connecting mechanism is A second protruding portion protruding in the radial direction from the base portion, the second protruding portion having a protrusion protruding in the radial direction at an end portion opposite to the base portion; a groove portion provided on the other of the syringe and the body, into which the second protrusion portion is fitted; 3. The pressure applying device according to claim 1, further comprising:

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