Medical balloon inflators and medical balloon inflator kits

Abstract

This medical balloon pressurizer has a syringe holder, a motion conversion mechanism, a driver, and a support member, and is configured in the manner described below. The syringe holder is attached to the proximal side of the support member and is capable of detachably supporting an injector having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member and is capable of converting the rotary force of the driver into force for pushing down the plunger of the injector. The driver has a handle and is equipped with a torque limiting function in which when torque for rotating the handle is equal to or greater than a predetermined value, said driver rotates idly and the torque is not transmitted to the motion conversion mechanism.

Description

Technical Field

[0005]

[0001] The present invention relates to a medical balloon pressurizer, and in particular, it can be suitably used for an operation of expanding a spinal balloon to create a cement filling space in a fractured vertebra and an operation of expanding a balloon in a blood vessel or the heart.

Background Art

[0002] As a treatment method for spinal compression fractures, there is a percutaneous vertebroplasty in which a needle is inserted into the compressed fractured vertebra and a medical cement (bone cement, polymethyl methacrylate) is injected therefrom for treatment. In this percutaneous vertebroplasty, after inserting a needle into the spine under general anesthesia, the spine is inflated with a medical balloon (when simply referred to as "balloon", unless otherwise specified, this specification refers to "medical balloon") to create a space, and a medical cement is injected into the space. There is a percutaneous posterior kyphosis correction (BKP: balloon kyphoplasty) in which a medical cement is injected into the space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In percutaneous posterior kyphosis correction, a surgical instrument with a small medical balloon is inserted into the fractured bone. By gradually inflating this medical balloon, the collapsed bone is lifted and restored to the shape before the fracture as much as possible. When this medical balloon is removed from the bone at the affected part, a space is created, and bone cement is filled into the space. Since the bone cement hardens, it can support the fractured bone, so the pain derived from the bone during standing and walking disappears. <00H00026><00H00027><00H00028>This medical balloon is inflated by injecting a contrast agent. The physician inflates the medical balloon while monitoring its inflation status using a navigator device. For example, Patent Document 1 describes a treatment method in which a balloon inserted into the body using an inflation syringe is injected with a contrast agent and then inflated.

[0006] Figure 16 is an explanatory diagram showing an example of the configuration of a conventional medical balloon inflation system. Specifically, Figure 16 is Fig. 8 of Patent Document 1. In a conventional medical balloon inflation system, as shown in Figure 16, a dedicated balloon indeflerator is used to pressurize and inject contrast agent into a balloon attached to the tip of a catheter. This balloon indeflerator pressurizes and pushes out the contrast agent injected into a syringe by rotating a threaded plunger. The contrast agent that is pushed out is then injected into the medical balloon.

[0007] When injecting contrast agent into this balloon, there is a risk of the balloon rupturing if the pressure exceeds a predetermined value. To prevent this, the indeflator syringe is equipped with a pressure gauge integrated into the syringe, allowing the pressure on the balloon to be constantly monitored during pressurization.

[0008] Because this indeflater inhales and dispenses contrast agent injected into the patient, it cannot be reused after a single use and is approved under the premise that it must be completely discarded. However, since this indeflater is a very expensive medical device, patients must also bear the cost of disposing of this expensive indeflater during treatment. Therefore, although percutaneous kyphosis correction is a very effective surgical procedure, it presents the challenge of a significant financial burden on patients.

[0009] The objective of this invention is to reduce the cost of percutaneous kyphosis correction surgery, and to that end, to reduce the cost of materials that must be discarded after each surgery.

[0010] The means for solving these problems are described below, but other problems and novel features will become apparent from the description and accompanying drawings in this specification. [Means for solving the problem]

[0011] The medical balloon inflator of the present invention comprises a syringe holder, a motion conversion mechanism, a driver, and a support member, and is configured as follows.

[0012] The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger.

[0013] The motion conversion mechanism is attached to the distal side of the support member and can convert the rotational force of the driver into a force that pushes the plunger of the syringe.

[0014] The driver has a handle and a torque limiting function which prevents the handle from rotating freely when the torque for rotating the handle exceeds a predetermined value, thereby preventing the torque from being transmitted to the motion conversion mechanism.

[0015] In this invention, the medical balloon inflator consists of a syringe holder, a motion conversion mechanism (which may consist of a cylinder and a shaft), a support member (which is called a cylindrical support member when the motion conversion mechanism consists of a cylinder and a shaft), and a driver. The medical balloon inflator with a syringe attached is called a medical balloon inflator kit. For the purpose of explaining the figure, a medical balloon inflator without the driver is used, and this is called the medical balloon inflator body. [Effects of the Invention]

[0016] The effects obtained by the above embodiment can be briefly described below.

[0017] That is, since the medical balloon pressurizer and the syringe are separate bodies, only the syringe needs to be replaced in a single operation, and the medical balloon pressurizer does not need to be discarded and can be reused. Since a general-purpose syringe can be used, it is inexpensive. Therefore, since the price of the item to be discarded after the operation is low, the economic burden on the patient can be greatly reduced.

Brief Description of the Drawings

[0018] [Figure 1] FIG. 1 is an explanatory diagram schematically showing the whole of a medical balloon expansion system used when expanding a balloon using the medical balloon pressurizer of the present invention. [Figure 2] FIG. 2 is an explanatory diagram schematically showing the front, side, and cross-sectional structures for showing an example of a method of fixing a syringe to the medical balloon pressurizer main body according to the first embodiment of the present invention. [Figure 3] FIG. 3 is an explanatory diagram showing the connection structure of the shaft and the plunger flange of the medical balloon pressurizer kit according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an explanatory diagram showing the correlation between the internal pressure of the syringe of the present invention and the rotational torque of the shaft. [Figure 5] FIG. 5 is an explanatory diagram schematically showing the front, side, and cross-sectional structures for showing an example of a method of fixing the syringe of the medical balloon pressurizer kit according to the second embodiment of the present invention. [Figure 6] FIG. 6 is an explanatory diagram schematically showing the front, side, and cross-sectional structures for showing an example of a method of fixing the syringe of the medical balloon pressurizer kit according to the third embodiment of the present invention. [Figure 7] FIG. 7 is an explanatory diagram schematically showing the front, side, and cross-sectional structures for showing an example of a method of fixing the syringe of the medical balloon pressurizer kit according to the fourth embodiment of the present invention. [Figure 8] FIG. 8 is an explanatory diagram schematically showing the front, side, and cross-sectional structures for showing an example of a method of fixing the syringe of the medical balloon pressurizer kit according to the fifth embodiment of the present invention. [Figure 9]FIG. 9 is an explanatory diagram schematically showing a front view, a side view, and a cross-sectional structure for illustrating an example of a method for fixing a syringe of a medical balloon pressurizer kit according to the sixth embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory diagram schematically showing a front view, a side view, and a cross-sectional structure for illustrating an example of a method for fixing a syringe of a medical balloon pressurizer kit according to the seventh embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory diagram showing an example of rotation of a syringe holder in a medical balloon pressurizer kit according to the seventh embodiment of the present invention. [Figure 12] FIG. 12 is an explanatory diagram schematically showing a front view, a side view, and a cross-sectional structure for illustrating an example of a method for fixing a syringe of a medical balloon pressurizer kit according to the eighth embodiment of the present invention. [Figure 13] FIG. 13 is an explanatory diagram schematically showing a structure for illustrating an example of a method for fixing a syringe of a medical balloon pressurizer kit according to the ninth embodiment of the present invention. [Figure 14] FIG. 14 is an explanatory diagram schematically showing a structure for illustrating another example of a method for fixing a syringe of a medical balloon pressurizer kit according to the tenth embodiment of the present invention. [Figure 15] FIG. 15 is an explanatory diagram showing a configuration example of connecting a shaft and a plunger flange of a medical balloon pressurizer kit of the present invention. [Figure 16] FIG. 16 is an explanatory diagram showing a configuration example of a conventional medical balloon expansion system. [Figure 17] FIG. 17 is an explanatory diagram schematically showing an entire medical balloon expansion system used when expanding a balloon using a medical balloon pressurizer according to the twelfth embodiment of the present invention. [Figure 18] FIG. 18 is an explanatory diagram schematically showing an example of a structure for making a syringe holder detachable from a medical balloon pressurizer main body according to the thirteenth embodiment of the present invention. [Figure 19] FIG. 19 is an explanatory diagram schematically showing an example of a structure for making a syringe detachable from a medical balloon pressurizer main body according to the fourteenth embodiment of the present invention. [Figure 20]Figure 20 is a schematic diagram illustrating an example of a structure in which a syringe can be attached to and detached from the medical balloon inflator body of the 15th embodiment of the present invention. [Figure 21] Figure 21 is a schematic diagram illustrating an example of a structure in which a syringe can be attached to and detached from the medical balloon inflator body of the 16th embodiment of the present invention. [Figure 22] Figure 22 is a schematic diagram illustrating an example of a structure for detachably fixing a syringe to the medical balloon inflator body of the 17th embodiment of the present invention. [Figure 23] Figure 23 is a schematic diagram illustrating an example of a rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. [Figure 24] Figure 24 is a schematic diagram illustrating a first example (coil spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. [Figure 25] Figure 25 is a schematic diagram illustrating a second example (leaf spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. [Figure 26] Figure 26 is a schematic diagram illustrating a third example (deformation of a coil spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. [Figure 27] Figure 27 is a schematic diagram illustrating an example of a rapid decompression mechanism (before plunger insertion) in the medical balloon inflator body of the 19th embodiment of the present invention. [Figure 28] Figure 28 is a schematic diagram illustrating an example of a rapid decompression mechanism (after plunger insertion) in the medical balloon inflator body of the 19th embodiment of the present invention. [Figure 29] Figure 29 is a schematic diagram illustrating an example of a rapid decompression mechanism (screw engagement release) in the medical balloon inflator body of the 19th embodiment of the present invention. [Figure 30] Figure 30 is a schematic diagram illustrating an example of a rapid decompression mechanism (plunger withdrawal) in the medical balloon inflator body of the 19th embodiment of the present invention. [Figure 31]Figure 31 is a schematic diagram illustrating an example of a rapid decompression mechanism (before plunger insertion) in the medical balloon inflator body of the 20th embodiment of the present invention. [Figure 32] Figure 32 is a schematic diagram illustrating an example of a rapid decompression mechanism (after plunger insertion) in the medical balloon inflator body of the 20th embodiment of the present invention. [Figure 33] Figure 33 is a schematic diagram illustrating an example of a rapid decompression mechanism (screw engagement release) in the medical balloon inflator body of the 20th embodiment of the present invention. [Figure 34] Figure 34 is a schematic diagram illustrating an example of a rapid decompression mechanism (plunger withdrawal) in the medical balloon inflator body of the 20th embodiment of the present invention. [Modes for carrying out the invention]

[0019] 1. Overview of the Embodiment First, a general overview of the representative embodiments disclosed in this application will be provided. The reference numerals in parentheses in the drawings used to refer to the representative embodiments are merely illustrative examples of components included in the concept of the elements to which they are attached.

[0020] [1] A medical balloon inflator with a detachable syringe and protection by a torque limiting mechanism (Figures 1-3, 5-15, 17-30) A typical embodiment disclosed in this application is a medical balloon inflator (120) having a syringe holder (8), a motion conversion mechanism ({1,2},{31,32,33},{2,41,42}), a driver (9), and a support member (3), and is configured as follows.

[0021] The syringe holder is attached to the proximal side of the support member and can detachably support a syringe (11) having a syringe (15) and a plunger (13).

[0022] The motion conversion mechanism is attached to the distal side of the support member and can convert the rotational force of the driver into a force that pushes the plunger (13) of the syringe.

[0023] The driver has a handle (91) and a torque limiting function which prevents the handle from rotating freely when the torque for rotating the handle exceeds a predetermined value, thereby preventing the torque from being transmitted to the motion conversion mechanism.

[0024] As a result, since the medical balloon inflator and syringe are separate components, only the syringe needs to be replaced in a single surgery; the medical balloon inflator does not need to be discarded and can be reused. Because standard syringes can be used, they are inexpensive. Therefore, the cost of discarded items after surgery is low, significantly reducing the financial burden on the patient.

[0025] [2] Syringe holder and support member are integrated (Figures 1, 2, 5, 6, 12, 20, 21, 22) The medical balloon inflator in [1] is configured as follows:

[0026] The syringe has a finger flange (14) provided at the distal end of the syringe and a plunger flange (12) provided at the distal end of the plunger.

[0027] The motion conversion mechanism includes a rotational motion section ({1,2},{32,33},{42,2}) that is connected to the driver and to which the torque is applied, and a linear motion section (1,31,41) that contacts the plunger flange and pushes the plunger.

[0028] The syringe holder has a syringe fixing portion (7) that detachably supports the syringe of the syringe, and a syringe-side finger flange fixing portion (6b) that contacts and supports the proximal side of the finger flange of the syringe.

[0029] This provides a practical and simple embodiment of the medical balloon inflator of the present invention.

[0030] [3] Double-supported support members (Figures 20-22) In the medical balloon inflator of [2], the support member (3) is two beam-shaped members, and the syringe holder and the motion conversion mechanism (composed of a shaft 1 and a cylinder 2) are each supported by the two beam-shaped support members.

[0031] As a result, the syringe holder (8) and the motion conversion mechanism (composed of shaft 1 and cylinder 2) are firmly positioned on the same axis, suppressing twisting and other forces associated with the rotation of the driver (9).

[0032] [4] Detachable motion conversion mechanism (Figure 20) In the medical balloon inflator of [3], the motion conversion mechanism is detachably attached by being inserted into and removed along a sliding mechanism (28, 38) provided on the two beam-shaped support members.

[0033] This makes it easier to attach and detach syringes to and from the syringe holder. This is because, with the motion conversion mechanism removed, the syringe can be inserted into the syringe holder from the direction in which the motion conversion mechanism should be attached, and then the motion conversion mechanism can be attached.

[0034] [5] Rotating motion conversion mechanism (Figure 21) In the medical balloon inflator of [3], the motion conversion mechanism is mounted by a rotation mechanism (29, 39) provided on the two beam-shaped support members so as to face the direction in which the syringe holder is attached and the other direction.

[0035] This makes it easy to attach and detach syringes to and from the syringe holder. By orienting the pusher that extends from the motion conversion mechanism and presses against the plunger flange of the syringe in a direction different from the direction of the syringe holder, a space is created at the top of the syringe holder. The syringe can then be inserted into the syringe holder through this space and attached, and then the direction can be returned to its original position and attached to the plunger flange of the syringe, which is fitted with the member that presses against the plunger flange.

[0036] [6] The syringe holder is detachable from the support member (Figures 7, 8, 9, 13, 14, 18). In the medical balloon inflator of [1], the syringe holder is detachably attached to the support member.

[0037] This makes it easier to attach and detach syringes from the syringe holder. This is because, with the syringe holder removed from the support member, the syringe can be attached to the syringe holder, and then the syringe holder with the syringe attached can be attached to the support member.

[0038] [7] Double-supported support member (Figure 18) In the medical balloon inflator of [6], the support member is two beam-shaped members, and the syringe holder and the motion conversion mechanism are each supported by the two beam-shaped support members.

[0039] As a result, the syringe holder and the motion conversion mechanism are firmly positioned side by side on the same axis, suppressing twisting and other forces associated with the rotation of the driver.

[0040] [8] The syringe holder is rotatable on the support member (Figures 10, 11, 19). In the medical balloon inflator of [1], the syringe holder is mounted by a rotating mechanism (843-845) provided on the two beam-shaped support members so that it is oriented in the direction to which the motion conversion mechanism is attached and in other directions.

[0041] This makes it easy to attach and detach syringes to and from the syringe holder. By rotating the syringe holder and orienting the member that pushes the plunger flange of the syringe, which extends from the motion conversion mechanism, in a direction different from the direction of syringe insertion, a space is created at the top of the syringe holder. The syringe can then be inserted into the syringe holder through this space and attached, and then the direction can be returned to its original position and attached to the plunger flange of the syringe to which the member that pushes the plunger flange is attached.

[0042] [9] Double-supported support member (Figure 19) In the medical balloon inflator of [8], the support member is two beam-shaped members, and the syringe holder and the motion conversion mechanism are each supported by the two beam-shaped support members.

[0043] As a result, the syringe holder and the motion conversion mechanism are firmly positioned side by side on the same axis, suppressing twisting and other forces associated with the rotation of the driver.

[0044]

[10] The motion conversion mechanism consists of a cylinder and a shaft (Figure 1) The medical balloon inflator in [1] is configured as follows:

[0045] The motion conversion mechanism comprises a cylinder (2) with an internal screw formed on its inner surface, and a shaft (1) that penetrates the cylinder and has an internal screw that engages with the internal screw on the inner surface of the cylinder.

[0046] The driver (9) is mounted such that the shaft can be rotated by the handle, and the shaft rotates in conjunction with the rotation of the handle, and moves back and forth in the axial direction of the shaft by engaging with the female thread on the inner surface of the cylinder, and the plunger can be moved back and forth in the axial direction via the plunger flange provided at the distal end of the plunger which contacts the shaft at its tip.

[0047] This provides a practical and simple embodiment of the medical balloon inflator of the present invention.

[0048]

[11] Rapid decompression mechanism (Figures 23-30) In the medical balloon inflator of [1], the motion conversion mechanism has pushers (31, 41) provided along the rotation axis of the driver and connected to the plunger flange of the syringe, and is configured as follows.

[0049] In other words, the motion conversion mechanism can switch between a normal state, which controls the pushing and pulling of the plunger into the syringe, and a rapid decompression state, which allows the plunger of the syringe to be pulled out regardless of the rotation of the driver, by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates.

[0050] This allows the balloon to be quickly depressurized and deflated in the event of an unforeseen situation.

[0051]

[12] Rapid decompression mechanism using a ratchet structure inside the syringe holder (Figures 23-26) In the medical balloon inflator of

[11] , the motion conversion mechanism comprises a cylinder (32) having screw threads on its outer circumference and rotating together with the driver, with the pusher connected to the central axis of rotation, and a ratchet structure (33) having screw threads that engage with the screw threads of the cylinder from the outside of the outer circumference and fixed to the syringe holder.

[0052] The motion conversion mechanism enters the normal state by engaging the threads of the cylinder with the threads of the ratchet structure, and enters the rapid decompression state by releasing the ratchet by moving the threads of the ratchet structure outward from the outer surface and disengaging them from the threads of the cylinder.

[0053] This allows for the implementation of an easy-to-operate rapid decompression mechanism in the motion conversion mechanism. The ratchet mechanism can be operated from the syringe holder side.

[0054]

[13] Rapid decompression mechanism by controlling whether or not the shaft engages with the cylindrical screw threads from the shaft side (Figures 27-30) In the medical balloon inflator of

[11] , the motion conversion mechanism comprises a cylinder (2) fixed to the support member and having screw threads on its inner surface, a shaft (1) inserted inside the cylinder and rotating together with the driver and to which the pusher is connected on the central axis of rotation, and one or more rods (42) having screw threads that mesh with the screw threads of the cylinder.

[0055] The shaft has grooves in a plane perpendicular to the central axis, and each of the one or more rods is in the normal state when it protrudes from the groove and the threads of the rod engage with the threads of the cylinder, and is in the rapid depressurization state when it is housed in the groove in the direction of the central axis and the threads of the rod disengage from the threads of the cylinder.

[0056] This allows for the implementation of an easy-to-operate rapid decompression mechanism in the motion conversion mechanism. The operation of the rod, i.e., switching between the normal state and the rapid decompression state, can be performed on the driver side.

[0057]

[14] A rapid decompression mechanism that controls the presence or absence of connection between the inner cylinder, which engages with the screw threads of the cylinder, and the shaft from the shaft side (Figures 31-34) In the medical balloon inflator of

[11] , the motion conversion mechanism comprises a cylinder (2) fixed to the support member and having screw threads on its inner surface, a shaft (1) inserted inside the cylinder and rotating together with the driver and to which the pusher is connected on the central axis of rotation, an inner cylinder having screw threads that mesh with the screw threads of the cylinder, and a rotation transmission rod (45).

[0058] The shaft has a groove in a plane perpendicular to the central axis, and the rotation transmission rod is in the normal state when a protrusion formed on the rotation transmission rod, which protrudes from the groove, fits into a recess formed on the inner circumferential surface of the inner cylinder, and is in the rapid depressurization state when the shaft is housed in the groove in the direction of the central axis, thereby releasing the engagement between the protrusion and the recess.

[0059] This allows for the implementation of an easy-to-operate rapid decompression mechanism in the motion conversion mechanism. The operation of the rotation transmission rod, i.e., switching between the normal state and the rapid decompression state, can be performed on the driver side.

[0060]

[15] Specification of torque limiter setting value (Figures 1-4) In the medical balloon inflator of [1], the predetermined value is set to 2 Nm.

[0061] This allows for controlled pressurization to prevent the balloon from bursting. Since it eliminates the need for conventional syringe pressure measurement devices, the overall cost of the medical balloon inflation system can be reduced.

[0062]

[16] Invention of a medical balloon inflator kit (Figures 1-4, Figure 17) The medical balloon inflator described in [1] is a medical balloon inflator kit (110) in which the syringe is detachably attached to the syringe holder.

[0063] This allows for the inflation of medical balloons. The present invention relates to a medical balloon inflator kit, which involves attaching a syringe to a medical balloon inflator.

[0064]

[101] Medical pressurizer with detachable syringe (Figures 1 and 2) A typical embodiment disclosed in this application is a medical balloon inflator (120) comprising a syringe holder (8) capable of fixing the syringe (15) of a syringe (11), a cylindrical support member (3) that supports a cylinder (2) having an internal thread formed on its inner surface, a shaft (1) having an internal thread that engages with the internal thread on the inner surface of the cylinder and passing through the cylinder, and a driver (9) to which the shaft is rotatably attached by a handle (91), and is configured as follows.

[0065] The syringe holder can detachably secure the syringe of the syringe to the syringe device by means of a syringe fixing part (7) and a syringe-side finger flange fixing part (6b).

[0066] The shaft rotates in conjunction with the rotation of the handle and moves back and forth in the axial direction of the shaft by engaging with the female thread on the inner surface of the cylinder, and the plunger (13) of the syringe can be moved back and forth in the axial direction via the plunger flange that contacts the shaft at its tip.

[0067] The driver has a torque limiting function that prevents the shaft from rotating when the torque used to rotate the handle exceeds a predetermined value.

[0068] Here, "front and back" refers to the proximal and distal sides when the axial direction is considered perpendicular to the trunk, and this expression is consistent throughout this specification unless otherwise specified. The shaft axis may also be abbreviated as the shaft axis.

[0069] This design allows the medical balloon inflator and syringe to be separate components, meaning only the syringe needs to be replaced during a single surgery. The medical balloon inflator does not need to be discarded and can be reused. A standard pressure-resistant syringe can be used, keeping its cost low. As a result, the cost of discarded items after surgery is minimal, significantly reducing the financial burden on the patient.

[0070] The configuration and technical features shown in

[101] are common to all of the first to ninth embodiments described below. The examples provided illustrate the concepts included in the components referenced in Figure 1 or Figure 2, which are enclosed in parentheses, but also include the reference numerals used for corresponding components in other embodiments. Each of the following sections will include the reference numerals used in the figures referenced in the embodiment corresponding to that section.

[0071]

[102] Means for securing the syringe to the medical balloon inflator (Figures 1-5) In the medical balloon inflator (120) of

[101] , the syringe fixing portion and the syringe-side finger flange fixing portion are ring-shaped so that the syringe can be passed through the inside and fixed.

[0072] This allows the syringe to be detachably fixed to the medical balloon inflator while also providing stable fixation that prevents it from easily coming loose from the syringe holder due to impact or other factors.

[0073]

[103] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 6) In the medical balloon inflator (120) of

[101] , the syringe fixing portion (407) and the syringe-side finger flange fixing portion (406b) can detachably fix the syringe by extending in an arc shape from both sides of the syringe holder along the sides of the syringe, and both ends have a gap that allows the markings on the syringe to be visible when the syringe is attached.

[0074] This allows the operator of the medical balloon inflator kit to visually check the syringe markings, even when the syringe is attached to the medical balloon inflator. Therefore, the operator can easily determine the amount of contrast agent held in the syringe.

[0075]

[104] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 6) In the medical balloon inflator (120) of

[103] , a shaft-side finger flange fixing part (6a) is provided on the syringe holder (5,405) that can detachably fix the finger flange of the syringe together with the syringe-side finger flange fixing part.

[0076] The syringe fixing portion (7,407) and the syringe-side finger flange fixing portion (6b,406b) are formed of an elastic material, and when the syringe is pressed against them, the gap expands and deforms to extend to the outer diameter of the syringe, thereby fixing the syringe when it is attached.

[0077] As a result, when attaching a syringe to a medical balloon inflator, the syringe can be attached by pressing it against the shaft-side finger flange fixing part and the syringe fixing part from a direction parallel to the shaft and perpendicular to the shaft axis direction, thereby widening the gap between them. When removing the syringe from the medical balloon inflator, pulling the syringe away from the syringe holder widens the gap between the shaft-side finger flange fixing part and the syringe fixing part, allowing the syringe to be removed from the syringe holder. In this way, the syringe can be easily attached and detached.

[0078]

[105] Means for securing the syringe to the medical balloon inflator (Figures 1-4, 7-12, 14, 15) In the medical balloon inflator (120) of

[101] , the syringe holder and the cylindrical support member are independent components.

[0079] This allows for easy attachment and detachment of syringes to and from medical balloon inflators by first securing the syringe tip to the syringe holder and then attaching it to the cylindrical component. Therefore, syringes can be easily and conveniently attached to and detached from medical balloon inflators.

[0080]

[106] Means for securing the syringe to the medical balloon inflator (Figures 1-4, 7, 8) In the medical balloon inflator (120) of

[105] , the cylindrical support member has slide grooves (542, 642) that extend substantially perpendicular to the axial direction of the shaft. The cross-section of the slide groove has a shape in which the width of the opening is narrower than the width of the bottom.

[0081] The cylinder holder has a syringe holder projection (541, 641) on the side opposite to the side that fixes the syringe, which fits into the slide groove and can be detachably fixed to the cylindrical support member.

[0082] This allows the syringe holder to be easily attached to and detached from the cylindrical support member.

[0083]

[107] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 7) In the medical balloon inflator (120) of

[106] , the syringe fixing part (507) is ring-shaped so that the syringe can be passed through the inside and fixed in place.

[0084] This allows the syringe holder to be easily attached to and detached from the cylindrical support member, and furthermore, the syringe is securely fixed to the medical balloon inflator while remaining detachable, and it will not easily come off the syringe holder due to impact or other factors.

[0085]

[108] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 8) In the medical balloon inflator (120) of

[106] , the syringe fixing portion (607) extends in an arc shape so that the side of the syringe of the syringe can be detachably fixed from both sides of the syringe holder, and both ends of the portion have a gap so that the markings on the syringe of the syringe can be seen when the syringe is attached.

[0086] As a result, the syringe holder can be easily attached to and detached from the cylindrical support member, and even when the syringe is attached to the medical balloon inflator, the operator of the medical balloon inflator kit can see the markings on the syringe. Therefore, the operator of the medical balloon inflator kit can easily determine the amount of contrast agent held in the syringe.

[0087]

[109] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 9) In the medical balloon inflator (120) of

[106] , the cylindrical support member further comprises a shaft-side finger flange fixing portion (706a) that presses and fixes the finger flange of the syringe from the plunger flange side.

[0088] The shaft-side finger flange has an arc shape that extends from the cylindrical support member.

[0089] This allows the cylinder holder to be easily attached to and detached from the cylindrical support member, while also fixing the mounted cylinder so that it does not move in the axial direction of the shaft.

[0090]

[110] Means for securing the syringe to the medical balloon inflator (Figures 1-4, 10-11) In the medical balloon inflator (120) of

[105] , the cylinder holder has a syringe holder projection (843) on the side opposite to the side that secures the syringe of the syringe.

[0091] The cylindrical support member has a recess or through hole (845) for fixing the cylinder holder so that it can rotate in a plane parallel to the cylindrical support member.

[0092] As a result, the syringe holder becomes rotatable relative to the cylindrical support member, allowing the syringe holder to be tilted to a position where the syringe and shaft do not collide when attaching the syringe to the syringe holder, and the syringe to be inserted inside the syringe-side finger flange fixing part and the syringe fixing part. Next, the syringe holder is rotated to a position parallel to the shaft axis, and then the plunger flange is fixed to the shaft. In this embodiment, the syringe can be easily attached to and detached from the syringe holder.

[0093]

[111] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 12) In the medical balloon inflator (120) of

[101] , the syringe fixing portion is a ring shape formed at the end that extends from the end (proximal end) of the cylindrical support member in a direction away from the cylindrical support member (further in the proximal direction).

[0094] The syringe-side finger flange fixing portion (906b) is formed of an elastic material and is provided so as to extend from both sides of the cylindrical support member in an arc shape that can hold the sides of the syringe of the syringe from both sides of the syringe holder. When the syringe is pressed against it, the gap expands, allowing the syringe of the syringe to pass through, and the syringe can be detachably fixed when it is attached.

[0095] The shaft-side finger flange fixing portion extends from both sides of the cylindrical support member and is formed to be detachably fixed together with the syringe-side finger flange fixing portion, sandwiching the finger flange.

[0096] This allows the syringe to be moved from the front, slightly above, and downwards to insert into the syringe holder and then withdrawn in the reverse direction. Therefore, the syringe can be easily attached to and detached from the medical balloon inflator.

[0097]

[112] Means for securing the syringe to the medical balloon inflator (Figures 1-4, 13, 14) In the medical balloon inflator (120) of

[105] , the cylindrical support member has a slide groove (1042) extending from its proximal end in the axial direction of the shaft and a through hole (1045) at a position that restricts movement of the syringe holder toward the tip (proximal end). The cross-sectional shape of the slide groove is such that the width of the opening is narrower than the width of the bottom.

[0098] The syringe holder has a shaft-side finger flange fixing portion (1006a) in a position where the finger flange can be detachably fixed together with the syringe-side finger flange fixing portion, and further has a syringe holder protrusion (1041) on the surface of the syringe opposite to the surface that fixes the syringe, which fits into the slide groove and can be detachably fixed to the cylindrical support member.

[0099] The stopper pin (1051) that passes through the aforementioned through hole restricts the movement of the syringe holder toward the tip.

[0100] This allows the syringe holder to be attached to the cylindrical support member after the syringe has been set, making it easy to attach the syringe to the medical balloon inflator. Furthermore, by removing the stopper pin, the syringe can be quickly removed proximal to the shaft. At this time, since the plunger flange of the syringe is fixed to the shaft, the plunger is pulled out of the syringe. In other words, it becomes possible to rapidly reduce the pressure on the medical balloon.

[0101]

[113] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 13) In the medical balloon inflator (120) of

[112] , the stopper pin (1051) has a stopper pin head (1052) at the portion of the cylindrical support member that is on the side opposite to the syringe, and the diameter of this portion is larger than the through hole.

[0102] Therefore, the stopper pin can be grasped by the stopper pin head and pulled out from the side of the cylindrical support member opposite to the side where the syringe is fixed. This makes it easy to remove the stopper pin.

[0103]

[114] Means for securing the syringe to the medical balloon inflator (Figures 1-4, Figure 14) In the medical balloon inflator (120) of

[112] , the stopper pin (1151) is fixed to a lever (1153) which is rotatably fixed by a hinge (1154) to the side of the cylindrical support member opposite to the syringe, and is removable through the through hole (1145).

[0104] Therefore, by rotating the lever, the stopper pin can be removed from the through-hole, allowing for quick removal of the stopper pin.

[0105]

[115] Specification of torque limiter setting value (Figures 1-4) In the medical balloon inflator (120) of

[104] , the driver is configured to allow the handle to spin freely when a torque of 2 Nm or more is applied to the shaft, thereby preventing the transmission of rotation to the shaft.

[0106] This allows for controlled pressurization to prevent the balloon from bursting. Since it eliminates the need for conventional syringe pressure measurement devices, the overall cost of the medical balloon inflation system can be reduced.

[0107]

[116] Invention of a medical balloon inflator kit (Figures 1-4) The medical balloon inflator (120) of

[101] is a medical balloon inflator kit (110) in which the syringe is detachably attached to the syringe holder.

[0108] This allows for the inflation of medical balloons. The present invention relates to a medical balloon inflator kit, which involves attaching a syringe to a medical balloon inflator.

[0109]

[117] Fixing means between the shaft and the plunger (Figures 1-4, Figure 15) In the medical balloon inflator kit (110) of

[116] , the shaft and the plunger flange are connected by a connecting member.

[0110] This allows the balloon to be forcibly deflated in emergencies. More specifically, by using a screwdriver to reverse the shaft, the plunger is pulled back, returning the contrast agent injected into the balloon to the syringe and deflating the balloon.

[0111]

[118] Fixing means between the shaft and the plunger (Figures 1 to 3) In the medical balloon inflator (120) of

[117] , the shaft has a through hole (231) near its tip, one end of a connecting pin (232) that passes through the through hole is bent so as to be able to lock onto the plunger flange, and the other end of the connecting pin is detachably fixed to a connecting pin fixing member (233) so as not to come out of the through hole.

[0112] The plunger flange of the syringe can be detachably fixed to the tip of the shaft by the connecting pin and the connecting pin fixing member.

[0113] This allows the forward and backward movement of the shaft in the axial direction to be transmitted to the plunger.

[0114]

[119] Fixing means between the shaft and the plunger (Figures 1 and 15) In the medical balloon inflator (120) of

[117] , the shaft has a constricted shaft notch (1260) that tapers near its tip.

[0115] The device has plunger flange fixing members (1261a, b) capable of clamping the shaft notch and the plunger flange.

[0116] This allows the forward and backward movement of the shaft in the axial direction to be transmitted to the plunger without transmitting the rotation of the shaft to the plunger.

[0117] 2. Details of the Embodiment The embodiments will be described in more detail.

[0118] Hereinafter, embodiments 1 to 11 will mainly describe embodiments corresponding to

[101] to

[119] above, and embodiments 12 onwards will mainly describe embodiments corresponding to [1] to

[18] above.

[0119] In embodiments 1 to 11, the medical balloon inflator 120 has a basic configuration consisting of a shaft 1, a cylinder 2, a cylindrical support member 3, a syringe holder 8, and a driver 9. On the other hand, in later embodiments 12 and beyond, the shaft 1 and cylinder 2 are positioned as a motion conversion mechanism that converts the rotational force of the driver 9 into linear motion of pushing in or pulling out the plunger 13 of the syringe attached to the syringe holder 8. Accordingly, the cylindrical support member 3 is simply referred to as "support member 3". That is, the shaft 1 and cylinder 2 in embodiments 1 to 11 are one embodiment of the motion conversion mechanism, and the cylindrical support member 3 is one embodiment of the support member 3. Also, although a cantilevered cylindrical support member 3 is illustrated in Figures 1 to 15, the configuration can be changed to support the cylinder 2 and syringe holder 8 from both sides by arranging two identical cylindrical support members 3 symmetrically across a central axis.

[0120] [Embodiment 1] Figure 1 is a schematic diagram illustrating the entirety of the medical balloon expansion system 100 used when expanding a medical balloon 24 using the medical balloon inflator 120 of the present invention. Specifically, Figure 1 is a diagram illustrating an example configuration of the medical balloon expansion system 100 for expanding a medical balloon 24 using the medical balloon inflator kit 110, which is a first embodiment of the present invention.

[0121] The medical balloon inflator kit 110, in which a syringe 11 is detachably fixed to a medical balloon inflator 120, is connected to a medical balloon 24 via a medical tube 21 connected to the syringe hub 16, a Y-connector 22, and a catheter shaft 23. The contrast agent, which has been pre-injected into the medical balloon inflator kit 110, is pressurized into the balloon inserted into the affected area by operating the medical balloon inflator kit 110.

[0122] The medical balloon inflator kit 110 consists of a medical balloon inflator 120 with a syringe 11 attached. This syringe 11 can be a general-purpose, inexpensive syringe.

[0123] The medical balloon inflator 120 consists of a shaft 1, a cylinder 2, a cylinder support member 3, a cylinder holder 8, and a driver 9.

[0124] The driver 9, which includes a handle 91 and a socket 92, is fixed to the shaft 1 by the socket 92. When the handle 91 is rotated, the socket 92 transmits the rotation to the shaft 1, causing the shaft 1 to rotate. The shaft 1 has male threads, and the inner surface of the cylinder 2 has female threads that engage with the shaft 1. Since the shaft 1 engages with the threads on the inner surface of the cylinder 2 and passes through the cylinder 2, rotating the shaft 1 causes the shaft 1 to move back and forth in the axial direction relative to the cylinder 2. In Figure 1, the handle 91 and the shaft 1 are fixed via the socket 92, but they may be fixed directly without the socket 92.

[0125] The cylindrical support member 3 supports the cylinder 2 and the syringe holder 8. The syringe holder 8 can detachably secure the syringe 15 of the syringe 11 by means of the syringe fixing part 7 and the finger flange fixing part 6. The syringe holder 8 may be formed integrally with the cylindrical support member 3.

[0126] In Figure 1, the end of the shaft 1 opposite the socket 92 is connected by a connecting member 4 to a plunger flange 12 provided on the end of the plunger 13 of the syringe 11. However, the connecting member 4 is not necessarily an essential component in the medical balloon inflator 120. By rotating the driver 9, the shaft 1 moves proximal, and as a result, the plunger flange 12 is pushed, pushing the plunger 13 into the syringe 15. This causes the contrast agent to be injected into the medical balloon 24 via the medical tube 21, Y-connector 22, and catheter shaft 23, thereby inflating the medical balloon 24. On the other hand, by rotating the driver 9 in the reverse direction, the shaft 1 is returned distally. The tension of the medical balloon 24 and external pressure push the injected contrast agent back, and as a result, the plunger 13 is pushed back from the syringe 15 and moves distally while remaining in contact with the tip of the shaft 1. On the other hand, when the shaft 1 and the plunger flange 12 are connected by a connecting member, this connecting member 4 transmits the forward and backward movement of the shaft 1 in the axial direction to the plunger flange 12, so that the forward and backward axial movement of the shaft 1 becomes the movement of the plunger 13 of the syringe 11. In other words, by rotating the handle 9, the pressure can be reduced and the medical balloon 24 can be deflated not only when discharging contrast agent from the syringe 11 and injecting it into the medical balloon 24, but also when withdrawing it from the medical balloon 24 and depressurizing it, without depending on the tension or external pressure of the medical balloon 24.

[0127] The driver 9 has a torque limiting mechanism and does not transmit loads exceeding a predetermined torque. In other words, when the handle 91 is rotated, if the load required to rotate the shaft 1 exceeds a predetermined value, the torque limiting mechanism of the driver 9 will activate, causing the handle 91 to spin freely. Therefore, the shaft 1 will not rotate with a torque exceeding the predetermined torque.

[0128] Because the medical balloon 24 is an elastic material, its internal pressure increases as it expands due to the injection of contrast agent. As a result, the syringe 11 will dispense the contrast agent with greater pressure as the medical balloon 24 expands. This increases the load on the plunger 13 of the syringe 11, and consequently, the load on the shaft 1 that moves the plunger 13 also increases. In other words, as the medical balloon 24 expands, a higher torque is required to rotate the shaft 1. That is, there is a correlation between the increased internal pressure when contrast agent is injected into the medical balloon 24 and the increased load on the shaft 1.

[0129] The torque limiting mechanism of the driver 9 prevents the shaft 1 from rotating above a predetermined torque, so the medical balloon inflator kit 110 will not inject contrast agent into the medical balloon 24 at a pressure exceeding a predetermined value. By setting the value in this torque limiting mechanism to a value below the value at which the medical balloon 24 could rupture, the contrast agent will not be injected into the medical balloon 24 at excessive pressure. As a result, even if the handle 91 is rotated more than necessary, the medical balloon 24 will not rupture. The torque limiting mechanism of the driver 9 may be provided in the socket 92 or inside the handle 91.

[0130] Figure 2 is a schematic diagram illustrating the front, side, and cross-sectional structures of the medical balloon inflator kit 110 according to the first embodiment of the present invention, showing an example of a method for fixing the syringe 15. In Figure 2, the medical balloon inflator body 230 without the driver 9 attached is shown and explained to illustrate an example of a method for fixing the syringe 15.

[0131] A front view of the medical balloon inflator body 230 is shown in the TOP VIEW. For the sake of simplicity, we will set up convenient XYZ axes. Here, the left-right direction of the drawing is the X-axis, with right being X+ and left being X-. The up-down direction of the drawing is the Z-axis, with top being Z+ and bottom being Z-. The direction from the back to the front of the drawing is the Y-axis, with the back being Y+ and the front being Y-. A side view of the medical balloon inflator body 230 from the X+ direction is shown in the TOP VIEW. The AA' section of the side view is shown in the A-A'x-sectional view.

[0132] The medical balloon inflator body 230 consists of a shaft 201, a cylinder 202, a cylindrical support member 203, and a syringe holder 208. The cylindrical support member 203 supports the cylinder 202 and the syringe holder 208. The shaft 201 passes through the cylinder 202 and can push the plunger flange 12 of the syringe 11 in the shaft axis direction. As shown in Figure 1, the shaft 1 and the plunger flange 12 can also be connected by a connecting member 4. The syringe holder 208 consists of a syringe fixing part 207, a finger flange fixing part 206, and a syringe fixing part support member 205 on which these are provided. The syringe fixing part support member 205 and the cylindrical support member 203 may be formed identically.

[0133] The syringe fixing portion 207 is provided extending from both sides of the syringe fixing portion support member 205 in the X-axis direction, in a shape that follows the outer surface of the syringe 15 in the direction in which the syringe 15 is fixed (Y-direction). The length of the syringe fixing portion 207 is such that it reaches a point where it narrows beyond the maximum width of the syringe 15 in the X-axis direction. In other words, the length of the syringe fixing portion 207 is such that it can hold the syringe 15 and prevent it from falling out.

[0134] The finger flange fixing portion 206 consists of a shaft-side finger flange fixing portion 206a and a syringe-side finger flange fixing portion 206b. The shaft-side finger flange fixing portion 206a and the syringe-side finger flange fixing portion 206b are provided on both sides of the cylindrical support member 203 in the X-axis direction, toward the direction (Y-direction) in which the syringe 15 is fixed. The finger flange 12 of the syringe 11 is sandwiched between the shaft-side finger flange fixing portion 206a and the syringe-side finger flange fixing portion 206b, and is fixed so as not to move in the shaft axis direction (Z-axis direction).

[0135] The lengths of the shaft-side finger flange fixing portion 206a and the syringe-side finger flange fixing portion 206b are such that, like the syringe fixing portion 207, they reach a position where they narrow beyond the maximum width in the X-axis direction of the syringe 15.

[0136] The shaft-side finger flange fixing portion 206a, the syringe-side finger flange fixing portion 206b, and the syringe 15 are made of an elastic resin or metal. Therefore, when attaching the syringe 11 to the syringe holder 208, when the syringe 11 is pushed from the tip of the syringe fixing portion 207 toward the cylindrical support member 203 (from Y- to Y+ direction), the syringe fixing portion 207 is pushed by the outer surface of the syringe 11, and deforms so that the syringe fixing portion 207 opens. Further pushing of the syringe 11 until the gap between the opened syringe fixing portion 207 narrows beyond its maximum width, the syringe fixing portion 207 and the syringe 15 fit together and are fixed in place.

[0137] To remove the syringe 11 from the syringe fixing part 207, pull the syringe 15 away from the syringe holder 208. This causes the syringe fixing part 207 and the syringe-side finger flange fixing part 206b to be pressed against each other by the outer surface of the syringe 15, opening them up and allowing the syringe 15 to be removed from the syringe holder 208. In this way, the syringe 11 is detachably fixed to the medical balloon inflator body 230. The elastic syringe fixing part 207 and syringe-side finger flange fixing part 206b can be made of metal such as stainless steel or resin.

[0138] Figure 3 is an explanatory diagram showing the connection structure between the shaft 201 of the medical balloon inflator kit 110 of the first embodiment of the present invention and the plunger flange 12 of the syringe 11. The lower figure shows the connection before the connecting pin 232 and the connecting pin fixing member 233 are connected, and the upper figure shows the connection after both are joined and the shaft 201 and the plunger flange 12 are fixed.

[0139] The shaft 201 has a through hole 231 near its tip. One end of the connecting pin 232 is bent into a hook shape and engages with the plunger flange 12, and the other end passes through the through hole 231 of the shaft 201 and is fixed to the connecting pin fixing member 233. The connecting pin 232 and the connecting pin fixing member 233 are fixed in a manner that, for example, the connecting pin fixing member 233 is provided with a hole into which the connecting pin 232 is inserted, and protrusions are provided near the tip of the connecting pin 232 and inside the hole, so that the connecting pin 232 and the protrusions inside the hole of the connecting pin fixing member 233 engage, allowing for attachment and detachment with a click sensation. In addition, the method of fixing the connecting pin 232 and the connecting pin fixing member 233 can be configured arbitrarily.

[0140] Furthermore, the connecting pin fixing member 233 engages with the plunger flange 12. The plunger flange 12 is fixed to the shaft 201 in the shaft axis direction (Z axis direction) by the connecting pin 232 and the connecting pin fixing member 233.

[0141] Figure 4 is an explanatory diagram showing the correlation between the internal pressure of syringe 15 and the rotational torque of shaft 1 in the medical balloon inflator kit (110, etc.) of the present invention. The inventor of the present invention is a physician who, based on his extensive experience performing percutaneous kyphosis correction surgery, found a correlation between the internal pressure of syringe 15 and the rotational torque of shaft 1. The following factors are related to the internal pressure of syringe 15 and the rotational torque of shaft 1.

[0142] Firstly, the length of the screw pitch on shaft 1 must be considered. The larger this pitch, the more contrast agent is delivered with each rotation. This causes the internal pressure of the medical balloon 24 to rise more. In other words, the larger the screw pitch, the higher the torque required to rotate shaft 1.

[0143] Secondly, there is the frictional force between the inner surface of the syringe 15 or cylinder 2 and the shaft 1. A larger frictional force results in a larger torque value required to rotate the shaft 1.

[0144] Thirdly, the size of the inner diameter of the syringe 15 is important. Even if the amount of rotation of the shaft 1 is the same, a larger inner diameter of the syringe 15 allows more contrast agent to be delivered to the medical balloon 24. Therefore, a larger inner diameter of the syringe 15 results in a larger torque value required to rotate the shaft 1.

[0145] Fourthly, there is the force that causes the medical balloon 24 to contract. In other words, the stronger the force that causes the medical balloon 24 to contract, the higher the internal pressure of the medical balloon 24 becomes. Therefore, the stronger the force that causes the medical balloon 24 to contract, the greater the torque required to rotate the shaft 1.

[0146] Fifth, there is the external pressure acting on the medical balloon 24. The higher the external pressure acting on the medical balloon 24, the higher the internal pressure of the medical balloon 24. Therefore, the higher the external pressure acting on the medical balloon 24, the greater the torque required to rotate the shaft 1.

[0147] Figure 4 is an explanatory diagram showing the correlation between the internal pressure of the syringe 15 and the rotational torque of the shaft 1 of the medical balloon inflator kit 110 of the present invention. Specifically, a dedicated jig was created, the handle 91 of the driver 9 of the medical balloon inflator kit was set in the jig, the end of the tube connected to the tip of the hub 16 of the syringe 11 was blocked, and the measurement was taken while pressure was applied.

[0148] In Figure 4, the horizontal axis represents the internal pressure (psi) of syringe 15, and the vertical axis represents the rotational torque (Nm). Measurements were taken for two syringes, A and B. The circular values ​​represent the measurements for syringe (A), and the triangular values ​​represent the measurements for syringe (B). Both syringes showed a roughly linear relationship, sloping upwards to the right. Here, at an internal pressure of 150 psi, the rotational torque was approximately 1 Nm; at an internal pressure of 250 psi, the rotational torque was approximately 1.5 Nm; and at internal pressures of 350 psi or higher, the rotational torque was 2 Nm or higher. From the results of this experiment, if the allowable upper limit of balloon internal pressure is 400 psi, the mechanism will prevent the balloon internal pressure from exceeding 400 psi by setting the torque limit to 2 Nm or less.

[0149] [Embodiment 2] The medical balloon inflator 120 of the present invention can employ multiple embodiments and combinations thereof to facilitate the attachment and detachment of the syringe 11.

[0150] Figure 5 is a schematic diagram illustrating the front, side, and cross-sectional structures of an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to a second embodiment of the present invention. In Figure 5, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 330 without the driver 9 attached is shown for explanation.

[0151] The XYZ axes, TOP VIEW, and SIDE VIEW shown in the figure are the same as in Figure 2. The BB' section of the SIDE VIEW is shown in the B-B'x-sectional view. The configuration of the shaft 301, cylinder 302, and cylindrical support member 303 is the same as described in Figure 2.

[0152] The syringe fixing portion 307 and the shaft-side finger flange fixing member 306b are ring-shaped with no openings, and both are provided on the syringe fixing portion support member 305. The inner diameter of this ring is long enough to accommodate the syringe 15 inside. In the medical balloon inflator body 330 shown in Figure 5, the syringe support member 305 and the cylindrical support member 303 are formed as a single unit, but they may be formed as separate parts.

[0153] In this embodiment, when attaching the syringe 11 to the medical balloon inflator body 330, the distance between the tip of the shaft 301 and the syringe-side finger flange fixing part 306b should be greater than the length of the syringe 11. The hub 16 of the syringe 11 is inserted into the ring of the syringe-side finger flange fixing part 306b from the shaft 301 side of the syringe-side finger flange fixing part 306b, and then into the ring of the syringe fixing part 307. Alternatively, the syringe 11 can be attached to the medical balloon inflator body 330 by connecting the shaft 301 and the plunger flange 12 with a connecting member as shown in Figure 3 or Figure 15.

[0154] To remove the syringe 11 from the medical balloon inflator body 330, the shaft 301 is moved upward (in the Z+ direction). Then, the syringe 11 is removed from the syringe fixing part 307 and the ring of the syringe-side finger flange fixing part 306b. In this way, the syringe 11 is attached to and detached from the medical balloon inflator 320.

[0155] In this embodiment, since the syringe fixing part 307 and the shaft-side finger flange fixing member 306b are ring-shaped with no openings, there is little risk of the syringe 11 attached to the medical balloon inflator body 330 unintentionally detaching from the medical balloon inflator body 330 due to impact or the like.

[0156] [Embodiment 3] Figure 6 is a schematic diagram illustrating the front, side, and cross-sectional structures of an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to a third embodiment of the present invention. In Figure 6, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 430 without the driver 9 attached is shown for explanation.

[0157] The XYZ axes, TOP VIEW, and SIDE VIEW shown in Figure 6 are the same as in Figure 2. The CC' section of the SIDE VIEW is shown in the C-C'x-sectional view. The configuration of the shaft 401, cylinder 402, and cylindrical support member 403 is the same as described in Figure 2.

[0158] The medical balloon inflator body 430 shown in Figure 6 differs from the medical balloon inflator body 330 shown in Figure 5 in the shape of the syringe fixing part 407 and the syringe-side finger flange fixing part 406b, but the other configurations are the same as the medical balloon inflator body 330 shown in Figure 5. The syringe 11 can also be attached to the medical balloon inflator body 430 by connecting the shaft 401 and the plunger flange 12 with a connecting member as shown in Figure 3 or Figure 15.

[0159] The syringe fixing portion 407 extends in an arc shape from both sides of the syringe fixing portion support member 405 in the direction in which the syringe 15 is attached (Y-direction), and its tip has a gap large enough to allow the markings on the syringe 15 to be visible. The syringe-side finger flange fixing portion 406b also has a gap in the same shape as the syringe fixing portion 407.

[0160] In this embodiment, the syringe fixing portion 407 and the syringe-side finger flange fixing portion 406b have a gap that allows the markings on the syringe 15 to be seen. Therefore, the person operating the medical balloon inflator kit 110 with the syringe 11 attached can operate it while looking at the markings on the syringe 11. This gap can be, for example, 1 cm.

[0161] [Embodiment 4] Figure 7 is a schematic diagram illustrating the front, side, and cross-sectional structures of an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to the fourth embodiment of the present invention. In Figure 7, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 530 without the driver 9 attached is shown for explanation.

[0162] The XYZ axes, TOP VIEW, and SIDE VIEW shown in Figure 7 are the same as in Figure 2. The DD' section of the SIDE VIEW is shown in the D-D'x-sectional view. The configuration of the shaft 501, cylinder 502, and cylinder support member 503 is the same as described in Figure 2. The shaft 501 and the plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 530.

[0163] The syringe fixing portion 507 and the syringe-side finger flange fixing portion 506b are ring-shaped, as in the second embodiment. The inner diameter of this ring is long enough to accommodate the syringe 15 inside. In this embodiment, the syringe holder 508 and the cylindrical support member 503 are separate. The syringe fixing portion support member 505 has a syringe holder projection 541 on the side opposite to the side on which the syringe fixing portion 507 extends. The cross-section of the syringe holder projection 541 is tapered, with the width at the point further away from the syringe holder 508 being greater than the width at the point closer to the syringe holder 508.

[0164] The cylindrical support member 503 is provided with a slide groove 542 in a direction perpendicular to the shaft axis (X-axis direction). The cross-section of this slide groove 542 is shaped to fit with the syringe holder projection 541. That is, the cross-section of the slide groove 542 has a tapered shape in which the width of the opening is narrower than the width of the bottom. Furthermore, at least one end of the slide groove 542 is open. The syringe holder 508 can be attached to the cylindrical support member 503 by inserting the cylinder holder projection 541 into the open end of the slide groove 542 and sliding the slide groove 542. Since the cross-sections of the syringe holder projection 541 and the slide groove 542 are tapered and fit together, the syringe holder 508 is fixed to the surface of the cylindrical support member in the direction perpendicular to the surface (Y-direction).

[0165] To set the syringe 11 into the medical balloon inflator body 530, insert the syringe 11 into the shaft-side finger flange fixing part 506b and the syringe fixing part 507, fix it to the syringe holder 508, and then fit the protrusion 541 of the syringe holder into the slide groove 542 and slide it into place. To remove the syringe 11 from the medical balloon inflator body 530, remove the syringe holder 508 from the slide groove 542, and then remove the syringe 11 from the syringe holder. In this way, the syringe 11 can be attached to and detached from the medical balloon inflator 520.

[0166] In Figure 7, there are two syringe holder protrusions 541 and two slide grooves 542, but there may be one of each, or more than two.

[0167] With the structure of this embodiment, the syringe 11 can be attached to the syringe holder 508, and then the syringe holder 508 can be attached to the cylindrical support member 503. The reverse process of attachment and detachment is also possible, allowing the syringe 11 to be easily attached to and detached from the medical balloon inflator.

[0168] [Embodiment 5] Figure 8 is a schematic diagram illustrating the front, side, and cross-sectional structures to show an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to the fifth embodiment of the present invention. In Figure 8, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 630 without the driver 9 attached is shown for explanation.

[0169] The XYZ axes, TOP VIEW, and SIDE VIEW shown in Figure 8 are the same as in Figure 2. The EE' section of the SIDE VIEW is shown in the E-E'x-sectional view. The configuration of the shaft 601, cylinder 602, and cylinder support member 603 is the same as described in Figure 2. The shaft 601 and the plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 630.

[0170] The configuration of the syringe holder 608, the syringe holder protrusion 641, and the slide groove 642 in this embodiment is the same as in the fourth embodiment. Furthermore, the shape of the syringe-side finger flange fixing portion 606b and the syringe fixing portion 607 in this embodiment is the same as in the third embodiment, and a gap is provided that allows the scale of the syringe 11 to be seen. In other words, this embodiment is a combination with the third embodiment.

[0171] With the structure of this embodiment, the syringe 11 can be easily attached and detached using the syringe holder protrusion 641 and slide groove 642, just as in the fourth embodiment, and the scale of the attached syringe 11 can be visually confirmed, just as in the third embodiment.

[0172] [Embodiment 6] Figure 9 is a schematic diagram illustrating the front, side, and cross-sectional structures of an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to the sixth embodiment of the present invention. In Figure 9, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 730 without the driver 9 attached is shown for explanation.

[0173] The XYZ axes, TOP VIEW, and SIDE VIEW shown in Figure 9 are the same as in Figure 2. The FF' section of the SIDE VIEW is shown in the F-F'x-sectional view. The configuration of the shaft 701, cylinder 702, and cylinder support member 703 is the same as described in Figure 2. Furthermore, the syringe holder 708, syringe holder protrusion 741, and slide groove 742 are the same as in the fourth embodiment. Note that the shaft 701 and the plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 730.

[0174] In this embodiment, the medical balloon inflator body 730 is provided with a syringe-side finger flange fixing portion 706a on the cylindrical support member 703. The syringe-side finger flange fixing portion 706a extends in an arc shape from one end of the cylindrical support member 703 and fixes the syringe 15 so that it does not move in the direction of the shaft 701 (Z+ direction).

[0175] In other words, this embodiment is a medical balloon inflator body 530 of the fourth embodiment with a syringe-side finger flange fixing part 706b provided. As a result, the syringe 11 can be easily attached to and detached from the medical balloon inflator body 730, similar to the fourth embodiment, and the movement of the attached syringe 11 in the direction of the shaft 701 (Z+ direction) is also restricted, allowing for stable fixation.

[0176] [Embodiment 7] Figure 10 is a schematic diagram illustrating the front, side, and cross-sectional structures to show an example of a method for fixing the syringe 15 of the medical balloon inflator kit according to the seventh embodiment of the present invention. In Figure 10, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 830 without the driver 9 attached is shown for explanation.

[0177] The XYZ axes and TOP VIEW and SIDE VIEW shown in Figure 10 are the same as in Figure 2. The GG' section of the SIDE VIEW is shown in the G-G'x-sectional view. The configuration of the shaft 801, cylinder 802, and cylinder support member 803 is the same as described in Figure 2. The shaft 801 and the plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 830.

[0178] The syringe fixing portion 807 is provided at both ends of the syringe fixing portion support member 805. The syringe fixing portion 807 extends in an arc shape in the direction in which the syringe 15 is mounted (Y-direction) and has a length that reaches a position where it narrows beyond the maximum width of the syringe 15 in the X-axis direction. The syringe-side finger flange fixing portion 806b is also provided at both ends of the syringe fixing portion support member 805, similar to the syringe fixing portion 807, and extends in an arc shape in the direction in which the syringe 15 is mounted (Y-direction) and has a length that reaches a position where it narrows beyond the maximum width of the syringe 15 in the X-axis direction. In other words, the shapes of the syringe-side finger flange fixing portion 806b and syringe fixing portion 807 in Figure 10 are the same as the syringe-side finger flange fixing portion 206b and syringe fixing portion 207 in Figure 2.

[0179] A cylindrical syringe holder rotation shaft 843 is provided on the side of the syringe holder 808 opposite to the syringe. The syringe holder rotation shaft 843 passes through a through hole 845 provided in the cylindrical support member 803, and the syringe holder 808 is fixed in a rotatable manner by a fastener 844.

[0180] Figure 11 is an explanatory diagram showing an example of rotation of the syringe holder 808 in a medical balloon inflator kit according to the seventh embodiment of the present invention. Fig. 11a on the left side of Figure 11 shows the position where the cylindrical support member 803 and the long side of the syringe holder 808 are parallel. Fig. 11b shows the syringe holder 808 in Fig. 11a rotated counterclockwise. When the cylinder holder 808 is in the position of Fig. 11a, it is difficult to attach the syringe 11 to the syringe holder 808 because the syringe 11 and the shaft 801 come into contact. However, as shown in Fig. 11b, by rotating the syringe holder 808, the syringe 11 can be attached to the syringe holder 808 without contacting the shaft 801. The same applies when removing the syringe 11 from the syringe holder 808. Therefore, in this embodiment, the syringe 11 can be easily attached and detached.

[0181] [Embodiment 8] Figure 12 is a schematic explanatory diagram showing the front, side, and cross-sectional structures to illustrate an example of a method for fixing the syringe 15 of the medical balloon inflator kit according to the eighth embodiment of the present invention. In Figure 12, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 930 without the driver 9 attached is shown for explanation. Alternatively, the shaft 901 and the plunger flange 12 can be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 930.

[0182] The XYZ axes, TOP VEIW, and SIDE VIEW shown in Figure 12 are the same as in Figure 2. The configuration of the shaft 901, cylinder 902, and cylinder support member 903 is also the same as described in Figure 2. Furthermore, the shaft-side finger flange fixing part 906a, syringe-side finger flange fixing part 906b, and syringe fixing part support member 905 are the same as in the first embodiment shown in Figure 2. The shaft 901 and plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 930.

[0183] The syringe fixing portion 907 extends diagonally from the end of the syringe fixing portion support member 905 in the direction in which the syringe 15 is mounted (Y-direction) and away from the cylinder-side finger flange fixing portion 906 (Z-direction). The syringe fixing portion 907 also has an arc shape that allows the syringe 15 to be mounted inside. The portion of the syringe fixing portion 907 that contacts the syringe may have a shape that extends parallel to the syringe-side finger flange fixing portion 907.

[0184] In this embodiment, when attaching the syringe 11 to the medical balloon inflator body 930, the syringe 11 is inserted between the diagonally extending syringe fixing portion 907 from the upper direction (Y- and Z+ direction) of the surface on which the syringe is set on the syringe holder 908, and the syringe side finger flange fixing portion 906b is pushed open to attach it, as in the first embodiment. When removing the syringe 11 from the medical balloon inflator 920, it is removed by moving it upward (Y- and Z+ direction) of the surface on which the syringe 11 is set on the syringe holder 908. In the first embodiment, it was necessary to push open the syringe side finger flange fixing portion 206b and the syringe fixing portion 207 when attaching and detaching the syringe 11, but in this embodiment, it is only necessary to push open the syringe side finger flange fixing portion 906b. Therefore, attaching and detaching the syringe 11 can be done with less force than in the second embodiment.

[0185] [Embodiment 9] Figure 13 is a schematic explanatory diagram showing a side view and cross-sectional structure to illustrate an example of a method for fixing the syringe 15 of a medical balloon inflator kit according to the ninth embodiment of the present invention. In Figure 13, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 1030 without the driver 9 attached is shown for explanation.

[0186] Figure 13 is a view from the SIDE VIEW perspective shown in Figure 2. The HH' section is shown in H-H'x-sectional view. The configuration of the shaft 1001, cylinder 1002, and cylinder support member 1003 is the same as described in Figure 2. Furthermore, the syringe fixing part 1007, syringe-side finger flange fixing part 1006b, and shaft-side finger flange fixing part 1006a have the same structure as in the first embodiment (Figure 2). Note that the shaft 1001 and the plunger flange 12 can also be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 1030.

[0187] In this embodiment, a slide groove 1042 is provided on the syringe holder 1008 side of the cylindrical support member 1003. The slide groove 1042 is provided in the axial direction (Z-axis direction) of the shaft 1 from the end of the cylindrical support member 1003 opposite to the cylinder 1002, and has a tapered shape in which the width of the opening is narrower than the width of the bottom of the cross-section.

[0188] A syringe holder projection 1041 is provided on the side of the syringe fixing support member 1005 opposite to the syringe 15. The cross-section of the syringe holder projection 1041 is tapered to engage with the cross-section of the slide groove 1042. The syringe holder 1008 can be slid in the direction of the cylinder 1002 (Z+ direction) by fitting the syringe holder projection 1041 into the slide groove 1042 at the end of the cylindrical support member 1003. The syringe holder 1008 is mounted by sliding it until the syringe holder projection 1041, which is the end of the slide groove 1042 on the cylinder 1002 side (Z+ side), makes contact. Subsequently, the syringe holder 1008 is restricted from moving in the direction opposite to the cylinder 1002 (Z-direction) by the stopper pin 1051 inserted into the through hole 1045 of the cylindrical support member 1003 from the opposite side of the cylinder 1002. As a result, the syringe holder 1008 is fixed in the front-to-back direction (Z-axis direction) of the shaft axis. Furthermore, since the syringe holder protrusion 1041 and the slide groove 1042 interlock with each other with tapered cross-sections, movement in the direction of the syringe mounting surface (X-axis and Y-axis directions) is also restricted and fixed. The stopper pin 1051 can be inserted into and removed from the through hole 1045 by gripping the stopper pin head 1052 at its end.

[0189] In this embodiment, the syringe 11 can be attached to and detached from the syringe holder 1008 with the syringe holder 1008 detached from the cylindrical support member 1003, making it easy to attach and detach the syringe 11. Furthermore, if the shaft 1001 and the plunger flange 12 of the syringe 11 are connected by a connecting member, when the syringe 11 is set in the medical balloon inflator body 1030, grasping the stopper pin head 1052 and removing the stopper pin 1051, and moving the syringe 11 towards the tip of the cylindrical support member 1003 (Z-direction), the plunger 13 connected to the shaft 1001 by the connecting member is pulled out from the syringe 15 of the syringe 11. This allows for a rapid reduction in the internal pressure of the syringe 15 and the medical balloon 24 connected to the medical balloon inflator body 1030. Even if, for some reason, the pressurization of the medical balloon 24 must be interrupted and the pressure reduced while it is being pressurized, the medical balloon pressurizer body 1030 of this embodiment can quickly reduce the pressure.

[0190] In Figure 13, the syringe-side finger fixing portion 1006b and the syringe fixing portion 1007 have an arc shape with a gap, but they can also be ring-shaped, as in the third embodiment.

[0191] [Embodiment 10] Figure 14 is a schematic diagram illustrating the side structure of the medical balloon inflator body 1130 to show an example of a method for fixing the syringe 15 of the medical balloon inflator kit according to the 10th embodiment of the present invention. In Figure 14, as with Figure 2, an example of a method for fixing the syringe 15 is shown, and the medical balloon inflator body 1130 without the driver 9 attached is shown for explanation.

[0192] Figure 14 is a view from the SIDE VIEW perspective shown in Figure 2. The configuration of the shaft 1101, cylinder 1102, cylindrical support member 1103, and syringe holder 1108 is the same as described in Figure 2. Furthermore, although the syringe holder protrusion and slide groove are not shown, their configurations are the same as in the ninth embodiment. The stopper pin 1151 is provided on the lever 1153. The lever 1153 is rotatably attached to the cylindrical support member 1103 by a hinge 1154. By rotating the lever 1153, the stopper pin 1151 can be inserted into and removed from the through hole 1145. The stopper pin 1151 inserted into the through hole 1145 by the lever 1153 protrudes from the opposite side of the cylindrical support member 1103 from the lever, fixing the syringe holder 1108 which is fitted into the slide groove (not shown). As a result, the syringe holder 1108 is fixed in the shaft axis direction (Z axis direction). Furthermore, since the syringe holder 1108 of this embodiment is fixed to a slide groove (not shown) similar to the medical balloon inflator 1020 of the ninth embodiment, the syringe holder 1108 is also fixed in the direction in which the syringe is fixed (Y-direction).

[0193] Alternatively, the shaft 1101 and the plunger flange 12 can be connected with a connecting member as shown in Figure 3 or Figure 15, and the syringe 11 can be attached to the medical balloon inflator body 1130.

[0194] In this embodiment, similar to the medical balloon inflator 1020 of the ninth embodiment, the syringe holder 1108 is fixed to the cylindrical support member 1103 by fitting the syringe holder protrusion into the slide groove (not shown), so that the syringe 11 can be easily attached and detached, just like in the ninth embodiment. Furthermore, by operating the lever 1153, the stopper pin 1151 can be quickly removed from the through hole 1145, so the stopper pin 1151 can be removed with a quicker and easier operation than the stopper pin 1051 in the ninth embodiment. In addition, in the ninth embodiment, the stopper pin 1051, which is not set in the cylindrical support member 1003, requires careful management as it may roll away. However, in this embodiment, since the stopper pin 1151 is fixed to the lever 1153, there is no risk of the stopper pin 1151 rolling away or getting lost.

[0195] [Embodiment 11] Figure 15 shows another embodiment of the connecting member 1233. Fig. 15a is a view from the front (from Y- to Y+ direction). Fig. 15c is a view in the direction of shaft 1201 (from Z+ direction to Z- direction). Fig. 15b is the JJ' section of Fig. 15c.

[0196] In this embodiment, the connecting member consists of plunger flange fixing members 1261a and 1261b. As shown in Fig. 15b, the shaft 1201 has a shaft notch 1260 that tapers to a circular cross-section near its tip. The plunger connecting members 1261a and 1261b are fixed in the shaft axis direction (Z axis direction) by fitting the upper side (Z+ side) into the shaft notch 1260 and the lower side (Z- side) onto the plunger flange 12. On the other hand, because the plunger flange fixing members 1261a and 1261b are fitted into the circular cross-section notch 1260, even if the shaft 1201 rotates, the plunger flange fixing members 1261a and 1261b and the plunger 12 do not rotate together with the shaft 1201. The plunger flange fixing members 1261a and 1261b are both fixed by the plunger flange fixing member fastener 1262.

[0197] This allows the forward and backward (Z-axis direction) movement of the shaft 1201 to be transmitted to the plunger 13.

[0198] [Embodiment 12] Figure 17 is a schematic diagram illustrating the entire balloon inflation system 100 used when inflating a medical balloon 24 using a medical balloon inflator 120 of the twelfth embodiment of the present invention. Similar to Embodiment 1 described with reference to Figure 1, the medical balloon inflator 120 with a syringe 11 attached is called a medical balloon inflator kit 110, and the medical balloon 24 is further connected via a medical tube 21 connected to the hub 16 of the syringe 11, a Y-connector 22, and a catheter shaft 23. The contrast agent, which has been injected into the medical balloon inflator kit 110 in advance, is pressurized into the medical balloon 24 inserted into the affected area by operating the medical balloon inflator kit 110.

[0199] The medical balloon inflator 120 of this embodiment 12 has a syringe holder 8, a motion conversion mechanism (1,2), a driver 9, and a support member 3, and is configured as follows.

[0200] The syringe holder 8 is attached to the proximal side of the support member 3 and can detachably support a syringe 11 having a syringe 15 and a plunger 13.

[0201] The motion conversion mechanism is attached to the distal side of the support member 3 and can convert the rotational force of the driver 9 into a force that pushes the plunger 13 of the syringe 11. In the example shown in Figure 17, similar to Embodiment 1 (Figure 1), the motion conversion mechanism consists of a shaft 1 having screw threads on its outer circumference and a cylinder 2 having screw threads on its inner circumference that mesh with the shaft's screw threads.

[0202] The driver 9 has a handle 91 and has a torque limiting function that prevents it from free-rotating and transmitting torque to the motion conversion mechanism when the torque required to rotate the handle 91 exceeds a predetermined value.

[0203] As a result, since the medical balloon inflator and syringe are separate components, only the syringe needs to be replaced in a single surgery; the medical balloon inflator does not need to be discarded and can be reused. Because standard syringes can be used, they are inexpensive. Therefore, the cost of discarded items after surgery is low, significantly reducing the financial burden on the patient.

[0204] The medical balloon inflator 120 of this embodiment 12 comprehensively includes the embodiments 1 to 11 described above. That is, the motion conversion mechanism is a mechanism that can convert the rotational motion of the driver 9 into linear motion of pushing or pulling the plunger 13 into or out of the syringe 15 of the syringe 11. Embodiments 1 to 17 and Figures 1 to 3, 5 to 15, 17 to 22, including this embodiment 12, describe a simple example consisting of a shaft 1 and a cylinder 2, but various implementation forms are possible, including those exemplified in embodiments 18 to 19 described later. In embodiment 18, the motion conversion mechanism is composed of a ratchet structure 33 that engages with a cylinder 32 having screw threads, and in embodiment 19, it is composed of a cylinder 2 having screw threads and two rods 42 having screw threads that engage with those screw threads.

[0205] Embodiment 1 (Figure 1) illustrates a cantilevered cylindrical support member 3, but in Embodiment 12, two cylindrical support members 3 are arranged symmetrically across the central axis to support the cylinder 2 and syringe holder 8 from both sides. As a result, the syringe holder 8 and the motion conversion mechanism (shaft 1 and cylinder 2) are firmly supported aligned on the same axis, suppressing the effects of twisting and other forces associated with the rotation of the driver 9.

[0206] Other configurations and operations are the same as those described in Embodiment 1 with reference to Figure 1.

[0207] [Embodiment 13] In the medical balloon inflator 120, it is preferable that the syringe holder 8 be configured to be detachable from the support member 3. This facilitates the attachment and detachment of the syringe 11 to the medical balloon inflator 120. This is because, with the syringe holder 8 removed from the support member 3, the syringe 11 can be attached to the syringe holder 8, and then the syringe holder 8 with the syringe 11 attached can be attached to the support member 3.

[0208] Figure 18 is a schematic diagram illustrating an example of a structure in which a syringe holder 8 can be attached to and detached from a medical balloon inflator body 120 of the 13th embodiment of the present invention. When the support member 3 extends in the Z-axis direction and two are arranged symmetrically in the Y-axis direction with respect to the central axis, the syringe holder protrusion 541 formed on the syringe fixing support member 5 of the syringe holder 8 is fitted into the slide groove 542 formed on the support member 3, and is configured to slide in the X-axis direction. The syringe fixing support member 5 is integrally formed with the syringe-side finger flange fixing part 6b and the syringe fixing part 7, and is attached to the support member 3 by sliding after the syringe portion of the syringe 11 is attached. At this time, the plunger flange 12 of the plunger 13 of the syringe 11 is attached to the shaft 1, which is the linear motion side (pusher) of the motion conversion mechanism. The components may be connected using the connecting member 4 as illustrated in Figure 17, or the configuration described in Embodiment 11 (Figure 15) may be adopted, or the plunger flange 12 may be slid in from the X-axis direction and fitted in place so that it does not come out in the Z-axis direction, as illustrated in Figure 18. The shaft-side finger flange fixing portion 6a is then attached to the support member 3 by a sliding mechanism similar to that of the syringe fixing portion support member 5.

[0209] [Embodiment 14] Figure 19 is a schematic diagram illustrating another example of a structure in which a syringe 11 can be attached to and detached from a medical balloon inflator body 120 of the 14th embodiment of the present invention. In the medical balloon inflator 120, the syringe holder 8 is mounted by a rotation mechanism (843-845) provided on two beam-shaped support members 3 so as to face in the direction in which the motion conversion mechanism is attached (+Z direction) and in other directions (e.g., +X direction). The inventive concept is the same as that of Embodiment 7 described with reference to Figures 10 and 11.

[0210] The syringe holder rotation shaft 843, formed in the syringe fixing support member 5 of the syringe holder 8, is passed through the through hole 845 provided in the support member 3 and secured by a fastener 844. If the support members 3 are fixed to each other and configured so that they do not come off on either side, the fastener 844 is not necessarily required. On the other hand, the fastener 844 may function to secure the two support members 3 so that they do not come off on either side.

[0211] The right side of Figure 19 shows the syringe holder 8 in a state where the syringe 11 can be attached to and detached from it. When the support member 3 extends in the Z-axis direction and two support members are arranged symmetrically on either side of the central axis in the Y-axis direction, the syringe holder 8 can be oriented in the X-axis direction so that the motion conversion mechanism does not get in the way, and the syringe 11 can be attached to the syringe holder 8. As illustrated in Figure 19, the shaft-side finger flange fixing part 6a is formed integrally with the support member 3 and is configured not to rotate together with the syringe holder 8. With this configuration, when the syringe 11 is attached and then rotated to the normal position as shown on the left side of Figure 19, the finger flange 14 of the syringe 11 is in contact with and held down by the shaft-side finger flange fixing part 6a, and the plunger flange 12 is connected to the shaft 1 using the connecting member 4. Not only can the method of connecting the plunger flange 12 to the shaft 1, which is the pusher of the motion conversion mechanism, be changed to any other arbitrary form, but the embodiment of the motion conversion mechanism can also be changed arbitrarily.

[0212] [Embodiment 15] Figure 20 is a schematic diagram illustrating an example of a structure in which a syringe 11 can be attached to and detached from a medical balloon inflator body 120 of the 15th embodiment of the present invention. While embodiment 13 made the syringe holder 8 detachable from the support member 3, this embodiment is an example of a configuration in which the motion conversion mechanism is detachable from the support member 3.

[0213] In this embodiment, the motion conversion mechanism is detachably attached by being inserted into and removed along a sliding mechanism provided on two support members 3. The support members 3 have sliding protrusions 38 on the sides facing each other, and support the cylinder 2, which is part of the motion conversion mechanism, by fitting it into a sliding groove 28 provided on the side of the cylinder 2 that contacts the support members 3. The support members 3 extend in the Z-axis direction and are arranged facing each other in the Y-axis direction, and the sliding protrusions 38 and sliding groove 28 are formed in the X direction, enabling attachment and detachment by sliding in the X-axis direction.

[0214] With the cylinder 2 and shaft 1, which constitute the motion conversion mechanism, removed, the syringe 11 is inserted into the syringe holder 8 from the direction in which the motion conversion mechanism should be attached (+Z direction) and attached. Then, the cylinder 2 and shaft 1, which constitute the motion conversion mechanism, are slid onto the support member 3 and attached, and the plunger flange 12 and shaft 1 of the syringe 11 are connected with the connecting member 4. In this way, the syringe 11 can be easily attached to and detached from the syringe holder 8.

[0215] The connection configuration between the plunger flange 12 and the shaft 1 may be changed to any configuration other than the one described above, such as the configuration described in Embodiment 11 (Figure 15). Figure 20 shows an example in which the slide projection 38 is formed on the support member 3 side and the slide groove 28 is formed on the cylinder 2 which is the motion conversion mechanism, but the relationship between the projection and the groove may be reversed. The direction of the slide was described as the X-axis direction, but it does not necessarily have to be perpendicular to the direction in which the support member 3 extends (Z-axis direction), and it may be changed so that it can be attached and detached by sliding from an oblique angle if there is a requirement for operability. In addition, the motion conversion mechanism was described as an example in which it is composed of the cylinder 2 and the shaft 1, but it may be changed to other forms of motion conversion mechanism.

[0216] [Embodiment 16] Figure 21 is a schematic diagram illustrating an example of a structure in which a syringe 11 can be attached to and detached from the medical balloon inflator body of the 16th embodiment of the present invention. While the 15th embodiment made the motion conversion mechanism detachable from the support member 3, this embodiment is an example of a configuration in which the motion conversion mechanism can be rotated on the support member 3.

[0217] In this embodiment, the motion conversion mechanism is mounted on two support members 3 by a rotation mechanism provided on the support members 3 so that it can be oriented in the direction in which the syringe holder 8 is attached and in other directions. The support members 3 have rotation holes 39 on the sides where the two support members 3 face each other, and a rotation shaft 29 provided on the side of the cylinder 2 that contacts the support members 3 of the motion conversion mechanism is fitted into it, thereby supporting the cylinder 2 and shaft 1 which constitute the motion conversion mechanism. The support members 3 extend in the Z-axis direction and are arranged facing each other in the Y-axis direction. The shaft 1 that constitutes the motion conversion mechanism is tilted in a direction different from the direction in which the syringe holder 8 is attached (Z-axis direction), creating a gap on the upper side (+Z direction) of the syringe holder 8, and the syringe 11 can be inserted through this gap and attached to the syringe holder 8. After attaching the syringe 11, the motion conversion mechanism is returned to its original direction, that is, the shaft 1 is in the same Z-axis direction as the support members 3, and the plunger flange 12 of the syringe 11 and the shaft 1 are connected by a connecting member 4. In this way, the syringe 11 can be easily attached to and detached from the syringe holder 8.

[0218] The connection configuration between the plunger flange 12 and the shaft 1 may be changed to any configuration other than the one described above, such as the configuration described in Embodiment 11 (Figure 15). The mechanism consisting of the rotating hole 39 and the rotating shaft 29 illustrated in Figure 21 may be changed to other rotating mechanisms. Furthermore, although the motion conversion mechanism was described as an example consisting of a cylinder 2 and a shaft 1, it may be changed to other forms of motion conversion mechanisms.

[0219] [Embodiment 17] Figure 22 is a schematic diagram illustrating an example of a structure in which a syringe 11 is detachably fixed to the medical balloon inflator body of the 17th embodiment of the present invention. In addition to a front view, Figure 22 also shows a cross-sectional view taken along line I-I'. Unlike embodiments 13 to 16, both the motion conversion mechanism and the syringe holder 8 are fixed to the support member 3.

[0220] Support members 3 extend in the Z-axis direction and are arranged opposite each other in the Y-axis direction. A syringe fixing support member 5 is fixed to bridge and connect the two support members 3. The syringe fixing support member 5 is plate-shaped and fixed to one end (-X end) in the thickness direction of support member 3. Above it (+X direction) are attached a syringe-side finger flange fixing part 6b and a syringe fixing part 7, both formed by leaf spring clips. Here, a leaf spring clip is a mechanism that supports a cylinder (syringe) by bending an elastic metal plate and sandwiching it from both sides. When the plates on both sides are spread apart and attached, the curved leaf spring wraps around the cylinder (syringe) to support it. The syringe-side finger flange fixing portion 6b is positioned to contact the finger flange 14 of the syringe 11 to be attached, and fixes the finger flange 14 by sandwiching it between the shaft-side finger flange fixing portion 6a, which protrudes from the support members 3 on both sides with a gap large enough for the plunger 13 to pass through. The syringe 11 is inserted and attached from the +X direction by pushing open the leaf spring clip that constitutes the syringe-side finger flange fixing portion 6b and the syringe fixing portion 7. At this time, the plunger 13 of the syringe 11 passes through the gap provided in the shaft-side finger flange fixing portion 6a. After attaching the syringe 11, the motion conversion mechanism is returned to its original direction, that is, the extension direction of the shaft 1 is returned to the same Z-axis direction as the support member 3, and the plunger flange 12 of the syringe 11 and the shaft 1 are connected by the connecting member 4. In this way, the syringe 11 can be easily attached to and detached from the syringe holder 8.

[0221] The connection configuration between the plunger flange 12 and the shaft 1 may be changed to any configuration other than the one described above, such as the configuration described in Embodiment 11 (Figure 15). The support mechanism for the syringe 11 illustrated in Figure 22 may be changed to another support mechanism. For example, instead of the leaf spring clip, a non-elastic arc-shaped holder that curves along the syringe 15 of the syringe 11 may be used, and a plate-shaped member that holds the syringe 15 in place from the +X direction may be fitted and secured after the syringe 11 is attached.

[0222] [Embodiment 18] The medical balloon inflator 120 of the present invention is more preferably equipped with a rapid decompression mechanism. In the balloon expansion system 100 of the present invention, the rotation of the driver 9 is converted by a motion conversion mechanism into a linear motion of pushing and pulling out the plunger 13 of the syringe 11, thereby increasing or decreasing the amount of contrast agent injected from the syringe 11 and expanding and deflating the medical balloon 24. In unforeseen circumstances, when the medical balloon 24 becomes excessively inflated, there may be a need for a function to quickly withdraw the contrast agent from the syringe 11 and deflate the medical balloon 24. To enable the plunger 13 to be withdrawn more quickly than the rotation of the driver 9, it is more preferable to provide a rapid decompression mechanism.

[0223] Figure 23 is a schematic diagram illustrating an example of a rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention.

[0224] The medical balloon inflator 120 of this embodiment 18 comprises a driver 9, a motion conversion mechanism, a support member 3, and a syringe holder 8 attached to the support member 3. The motion conversion mechanism is provided along the rotation axis of the driver 9 and has a pusher 31 connected to the plunger flange 12 of a syringe 11 attached to the syringe holder 8. By changing the distance between the syringe 15 of the syringe 11 and the pusher 31 as the driver 9 rotates, it is possible to switch between a normal state that controls the pushing and pulling of the plunger 13 of the syringe 11 into the syringe 15 and a rapid decompression state that allows the plunger 13 of the syringe 11 to be pulled out regardless of the rotation of the driver 9. This makes it possible to quickly depressurize and deflate the medical balloon 24 in the event of an unforeseen situation.

[0225] The motion conversion mechanism illustrated in Figure 23 is similar to the mechanism shown in Figure 24, which will be described later, but its implementation is arbitrary as long as it is configured to switch between the normal state and the rapid decompression state.

[0226] Figure 24 is a schematic explanatory diagram showing a first example (coil spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. The motion conversion mechanism of this embodiment consists of a pusher 31, a cylinder 32, a ratchet mechanism 33, a pivot point 34, an operating lever 35, and an elastic body exemplified by a coil spring 36. The pusher 31 is connected to the driver 9 and rotates together with it, and is also connected to the cylinder 32 and transmits its rotation to the cylinder 32.

[0227] The outer surface of the cylinder 32 is provided with screw threads, which engage with the ratchet mechanism 33 to convert the rotational motion of the cylinder 32 into the linear motion of the connected pusher 31. The pusher 31 is connected at its tip (proximal end) to the plunger flange 12 of the syringe 11 using a connecting member 4, etc., and the linear motion pushes or pulls the plunger 13 of the syringe 11 into or out of the syringe 15 fixed to the support member 3. This results in the normal state where the plunger 13 can be pushed in or out as the driver 9 rotates.

[0228] The ratchet mechanism 33 is operated by the operating lever 35, with the pivot point 34 in between. The operating lever 35 is pushed away from the support member 3 by a coil spring 36 fixed to the support member 3. However, when the operating lever 35 is pushed to compress the coil spring 36 and bring it closer to the support member 3, the threads formed on the ratchet mechanism 33 separate from the threads formed on the outer surface of the cylinder 32, and the screw engagement is released. As a result, the cylinder 32 and the pusher 31 connected thereto can move linearly regardless of the rotation of the driver 9. This allows the plunger 13 connected to the pusher 31 to be rapidly withdrawn from the syringe 15. In other words, it is in a rapid decompression state. Thus, the normal state and the rapid decompression state can be switched by operating the operating lever 35. In the rapid decompression state, the main purpose is to rapidly decompress and deflate the medical balloon 24, but it is also possible to rapidly inflate the medical balloon 24 by linearly pushing the plunger 13 into the syringe 15 regardless of the rotation of the driver 9.

[0229] Figure 25 is a schematic diagram illustrating a second example (leaf spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. The elastic body fixed to the support member 3 and pushing the operating lever 35 away from the support member 3 has been changed from a coil spring to a leaf spring 36. The operating lever 35 protrudes significantly outward to accommodate the end of the leaf spring 36, and is configured to assist in the pushing motion. The other configurations and operations are the same as those described above with reference to Figure 24.

[0230] Figure 26 is a schematic diagram illustrating a third example (deformation of a coil spring) of the rapid decompression mechanism in the medical balloon inflator body of the 18th embodiment of the present invention. The elastic body fixed to the support member 3 and pushing the operating lever 35 away from the support member 3 is a coil spring 36, similar to that in Figure 24. However, the end on the support member 3 side is housed in a recess formed in the support member 3, and the other end is housed in a portion that protrudes significantly outward from the operating lever 35, thus assisting the pushing motion, similar to that in Figure 25. The other configurations and operations are the same as those described above with reference to Figure 24.

[0231] In the rapid decompression mechanism of the embodiment illustrated in Figures 23 to 26, it is even more preferable to configure the cylinder 32 so that it does not detach from the support member 3 even when pulled. In this case, it is preferable that the range of motion of the cylinder 32 is such that the plunger 13 does not detach from the syringe 15 in the connected syringe.

[0232] [Embodiment 19] Figures 27 to 30 are schematic explanatory diagrams illustrating an example of a rapid decompression mechanism in the medical balloon inflator body of the 19th embodiment of the present invention. Figure 27 shows the plunger before it is pushed in, Figure 28 shows it after it is pushed in, Figure 29 shows it when the screw is disengaged, and Figure 30 shows it when the plunger is withdrawn. To the right of each figure, a YY-YY' cross section is shown. YY-YY' is a plane perpendicular to the Z-axis direction, which is the central axis of rotation of the driver 9, and is the direction in which the support member 3 is positioned, while XX-XX' is the direction perpendicular to YY-YY'.

[0233] In the medical balloon inflator 120 of this embodiment, the motion conversion mechanism includes a cylinder 2 fixed to a support member 3 and having screw threads on its inner circumference, a shaft 1 inserted inside the cylinder 2 and rotating together with a driver 9, with a pusher 41 connected to the central axis of rotation, and two rods 42 having screw threads that mesh with the screw threads of the cylinder 2. The shaft 1 has grooves formed on either side of the central axis in a plane perpendicular to the central axis of rotation of the driver 9.

[0234] Each of the two rods 42 protrudes from its groove, and the threads of the rods 42 engage with the threads of the cylinder 2, resulting in the normal state (Figure 27). Because the threads of the rods 42 engage with the threads of the cylinder 2, when the driver 9 is rotated, the rods 42, shaft 1, and pusher 41 move in a linear motion, allowing the plunger 13 to be pushed into or pulled out of the syringe 15. Figure 28 shows the plunger flange 12 pushed in deeply, close to the finger flange 14.

[0235] When the release lever 43 is operated, the rod 42 is pulled in the direction of the central axis and stored in the groove formed in the shaft 1, disengaging the threads of the rod 42 from the threads of the cylinder 2 (Figure 29). In this state, the driver 9, shaft 1, rod 42, and pusher 41 can be moved linearly along the central axis without being restricted by the threads of the cylinder 2, i.e., a rapid decompression state is achieved. In this rapid decompression state, by pulling back the driver 9 while holding the release lever 43, the plunger 13 is rapidly pulled back from the state where it is pushed into the syringe 15, and the connected medical balloon 24 can be rapidly deflated (Figure 30).

[0236] This allows for the implementation of an easy-to-operate rapid decompression mechanism in the motion conversion mechanism. The rod 42 can be operated from the driver side.

[0237] In the rapid decompression mechanism of the embodiment illustrated in Figures 27-30, a configuration with two rods 42 arranged symmetrically was described as an example, but the number of rods 42 may be one or two or more. If the number of rods 42 is one, the mechanism for moving the rod 42 by the release lever 43 and the space around the shaft 1 can be made smaller overall. If the number of rods is two or more, the rotation of the driver 9 can be stably transmitted to the shaft 1 by arranging them symmetrically with respect to the central axis. In addition, in the rapid decompression mechanism of the embodiment illustrated in Figures 27-30, the size of the connecting member between the pusher 41 and the plunger flange 12 can be made larger than the inner diameter of the cylinder 2, so that the cylinder 2 does not come off the support member 3 to which it is fixed. In this case, it is preferable that the range of motion of the pusher 41 is such that the plunger 13 does not come off the syringe 15 in the connected syringe.

[0238] [Embodiment 20] Figures 31 to 34 are schematic explanatory diagrams illustrating an example of a rapid decompression mechanism in the medical balloon inflator body of the 20th embodiment of the present invention. The rapid decompression mechanism is configured by controlling the presence or absence of connection between the shaft and the inner cylinder 44, which engages with the threads of the cylinder 2, from the shaft 1 side. Figure 31 shows the state before the plunger is pushed in, Figure 32 shows the state after the plunger is pushed in, and Figure 34 shows the state when the plunger is withdrawn. To the right of each figure, a YY-YY' cross section is shown. YY-YY' is a plane perpendicular to the Z-axis direction, which is the central axis of rotation of the driver 9, and is the direction in which the support member 3 is arranged, while XX-XX' is the direction perpendicular to YY-YY'.

[0239] In the 20th embodiment of the present invention, a medical balloon inflator 120, the motion conversion mechanism includes a cylinder 2 fixed to a support member 3 and having screw threads on its inner surface, a shaft 1 inserted inside the cylinder 2 and rotating together with a driver 9, with a pusher connected to the central axis of rotation, an inner cylinder 44 having screw threads that mesh with the screw threads of the cylinder 2, and a rotation transmission rod 45. The shaft 1 has a groove in a plane perpendicular to the central axis, and the rotation transmission rod 45 protrudes from this groove, so that a convex portion formed on the rotation transmission rod 45 fits into a recess formed on the inner surface of the inner cylinder 44, resulting in the normal state (Figure 31). When the driver 9 is rotated in this state, the rotation of the driver 9 and the rotation transmission rod 45, which rotates together with the shaft 1, is directly transmitted to the inner cylinder 44, the inner cylinder 44 and the screw threads of the cylinder 2 mesh, converting the rotational motion of the driver 9 into linear motion of the shaft 1, and the plunger can be pushed in or pulled out in conjunction with the rotation of the driver 9. Figure 32 shows the plunger flange 12 pushed in deeply, close to the Hunger Fringe 14.

[0240] When the release lever 43 is operated, the rotation transmission rod 45 is pulled in the direction of the central axis and stored in the groove formed in the shaft 1, releasing the connection between the rotation transmission rod 45 and the inner cylinder 44 (Figure 33). At this time, the driver 9, rotation transmission rod 45, and shaft 1 can be moved linearly along the central axis without being restricted by the threads of the cylinder 2, i.e., a rapid decompression state is achieved. In this rapid decompression state, by pulling back the driver 9 while holding the release lever 43, the plunger 13 is rapidly pulled back from the state in which it is pushed into the syringe 15, and the connected medical balloon 24 can be rapidly deflated (Figure 34).

[0241] This allows for the implementation of an easy-to-operate rapid decompression mechanism in the motion conversion mechanism. The operation of the rotation transmission rod 45, i.e., switching between the normal state and the rapid decompression state, can be performed on the driver 9 side.

[0242] In the rapid decompression mechanism of the embodiment illustrated in Figures 31-34, a configuration with two symmetrically arranged rotary transmission rods 45 was described as an example, but the number of rotary transmission rods 45 may be one or more. If the number of rotary transmission rods 45 is one, the overall size can be reduced because there is more space around the shaft 1 and the mechanism for moving the rotary transmission rod 45 by the release lever 43. If the number of rotary transmission rods 45 is two or more, the rotation of the driver 9 can be stably transmitted to the shaft 1 by arranging them symmetrically with respect to the central axis. In addition, although multiple protrusions are illustrated in the examples, there may be only one (one for each rotary transmission rod 45). Furthermore, it is possible to switch between connecting or disconnecting the part that rotates with the driver 9 and the inner cylinder 44 by operating the release lever 43, etc., and if the inner cylinder 44 remains engaged with the cylinder 2 when the connection is released, allowing the shaft 1 to be pulled out, it is possible to change to other mechanisms as desired. For example, the cylindrical 2 exemplified in Figures 31-34 may be replaced with a columnar member having an arc-shaped base that engages with the threads of the inner cylinder 44 from both sides or multiple locations to provide support.

[0243] Furthermore, in the rapid decompression mechanism of the embodiment illustrated in Figures 31 to 34, by making the size of the connecting member between the pusher 41 and the plunger flange 12 larger than the inner diameter of the inner cylinder 44, it is possible to configure the shaft 1 and the pusher 41 so that they do not come out of the support member 3 to which the inner cylinder 44 is fixed together with the cylinder 2. In this case, it is preferable that the range of motion of the pusher 41 be such that the plunger 13 does not come out of the syringe 14 in the connected syringe.

[0244] Although the present inventor's invention has been specifically described above based on embodiments, it goes without saying that the present invention is not limited thereto and can be modified in various ways without departing from its essence. [Industrial applicability]

[0245] The present invention relates to a medical balloon pressurizer, and is particularly suitable for use in an operation to expand a spinal balloon in order to create a cement filling space in bones such as fractured spinal bones and limb bones. The present invention is a reusable medical balloon pressurization and decompression device that has a structure capable of confirming the balloon expansion volume with a syringe memory and also has a mechanism for preventing an increase in the specified balloon internal pressure. This makes it possible to omit the internal pressure measuring device when the internal pressure measurement itself is not important even when expanding a balloon in a blood vessel or the heart, etc., other than in bones. The present invention can eliminate the internal pressure measuring device and is useful as an inexpensive medical balloon pressurizer.

Explanation of Signs

[0246] 1 Shaft, Pusher (Plunger Pusher) 2 Cylinder 3 Support Member, Cylinder Support Member 4 Connecting Member 5 Syringe Fixing Part Support Member 6 Finger Flange Fixing Part 6a Shaft Side Finger Flange Fixing Part 6b Syringe Side Finger Flange Fixing Part 7 Syringe Fixing Part 8 Syringe Holder 9 Driver 11 Syringe 12 Plunger Flange 13 Plunger 14 Finger Flange 15 Syringe 16 Hub 21 Medical Tube 22 Y - Connector 23 Catheter Shaft 24 Medical Balloon 28 Slide Groove 29 Rotation Axis 31, 41 Pusher (Plunger Pusher) 32 Cylinder 33 Ratchet Mechanism 34 Fulcrum 35 Operation Lever 36. Elastic bodies (coil springs, leaf springs) 38. Sliding protrusion 39 Rotating holes 42 rods 43 Release lever 44 Inner cylinder 45 Rotary transmission rod 91 Handle 92 sockets 100 Medical Balloon Inflation System 110 Medical Balloon Inflator Kit 120 Medical Balloon Inflator 130 Medical balloon inflator main unit 231 Through hole 232 Connecting pins 233 Connecting pin fixing member 541 Syringe holder protrusion 542 Slide groove 843 Syringe holder rotating shaft (protruding part) 844 Fasteners 845 Through hole 1051 Stopper Pin 1052 Stopper Pin Head 1153 Lever 1154 Hinge 1260 Shaft notch 1261a, 1261b Plunger flange fixing member 1262 Plunger flange fixing member fastener

Claims

1. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The syringe has a finger flange provided at the distal end of the syringe and a plunger flange provided at the distal end of the plunger. The motion conversion mechanism has a rotational motion part that is connected to the driver and to which the torque is applied, and a linear motion part that contacts the plunger flange and pushes the plunger, The syringe holder has a syringe fixing portion that detachably supports the syringe of the syringe, and a syringe-side finger flange fixing portion that contacts and supports the proximal side of the finger flange of the syringe. The support member is symmetrical with respect to the central axis and consists of two beam-like members, and the syringe holder and the motion conversion mechanism are each supported by these two beam-like support members. Medical balloon inflator.

2. In claim 1, The motion conversion mechanism is detachably attached by being inserted into and removed along a sliding mechanism provided on the two beam-shaped support members. Medical balloon inflator.

3. In claim 1, The motion conversion mechanism is mounted by a rotation mechanism provided on the two beam-shaped support members so as to be directed in the direction in which the syringe holder is attached and in other directions. Medical balloon inflator.

4. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The syringe holder is detachably attached to the support member. The support member is symmetrical with respect to the central axis and consists of two beam-like members, and the syringe holder and the motion conversion mechanism are each supported by these two beam-like support members. Medical balloon inflator.

5. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The syringe holder is mounted by a rotation mechanism provided on two beam-shaped support members that are symmetrical with respect to the central axis, so that it can be oriented in the direction to which the motion conversion mechanism is attached and in other directions. Medical balloon inflator.

6. In claim 5, The support member is in the shape of two beams, and the syringe holder and the motion conversion mechanism are each supported by the two beam-shaped support members. Medical balloon inflator.

7. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The motion conversion mechanism has a pusher provided along the rotation axis of the driver and connected to the plunger flange of the syringe, The normal state controls the pushing and pulling of the plunger into the syringe by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates, Regardless of the rotation of the driver, it is possible to switch between a rapid decompression state that allows the plunger of the syringe to be withdrawn and a state that allows for rapid decompression. The motion conversion mechanism comprises a cylinder having screw threads on its outer surface and rotating together with the driver, with the pusher connected to the central axis of rotation, and a ratchet structure fixed to the syringe holder having screw threads that engage with the screw threads of the cylinder from the outside of the outer surface. The motion conversion mechanism achieves the normal state by engaging the threads of the cylinder with the threads of the ratchet structure, and achieves the rapid decompression state by releasing the ratchet by moving the threads of the ratchet structure outward from the outer surface and disengaging them from the threads of the cylinder. Medical balloon inflator.

8. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The motion conversion mechanism has a pusher provided along the rotation axis of the driver and connected to the plunger flange of the syringe, The normal state controls the pushing and pulling of the plunger into the syringe by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates, Regardless of the rotation of the driver, it is possible to switch between a rapid decompression state that allows the plunger of the syringe to be withdrawn and a state that allows for rapid decompression. The motion conversion mechanism comprises a cylinder fixed to the support member and having screw threads on its inner surface, a shaft inserted inside the cylinder and rotating together with the driver, with the pusher connected to the central axis of rotation, and one or more rods having screw threads that mesh with the screw threads of the cylinder. The shaft has a groove in a plane perpendicular to the central axis, Each of the one or more rods is in the normal state when it protrudes from the groove and its threads engage with the threads of the cylinder, and is in the rapid depressurization state when it is housed in the groove in the direction of its central axis, thereby disengaging the threads of the rod from the threads of the cylinder. Medical balloon inflator.

9. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is attached to the proximal side of the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is attached to the distal side of the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The motion conversion mechanism has a pusher provided along the rotation axis of the driver and connected to the plunger flange of the syringe, The normal state controls the pushing and pulling of the plunger into the syringe by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates, Regardless of the rotation of the driver, it is possible to switch between a rapid decompression state that allows the plunger of the syringe to be withdrawn and a state that allows for rapid decompression. The motion conversion mechanism comprises a cylinder fixed to the support member and having screw threads on its inner surface, a shaft inserted inside the cylinder and rotating together with the driver, with the pusher connected to the central axis of rotation, an inner cylinder having screw threads that mesh with the screw threads of the cylinder, and a rotation transmission rod. The shaft has a groove in a plane perpendicular to the central axis, The rotational transmission rod is in the normal state when a protrusion formed on the rotational transmission rod, which protrudes from the groove, engages with a recess formed on the inner circumferential surface of the inner cylinder, and is in the rapid depressurization state when the rod is housed in the groove in the direction of the central axis, thereby releasing the engagement between the protrusion and the recess. Medical balloon inflator.

10. In any one of claims 1 to 9, The motion conversion mechanism comprises a cylinder with an internal thread formed on its inner surface, and a shaft having an internal thread that engages with the internal thread on the inner surface of the cylinder and passing through the cylinder. The driver is mounted so that the shaft can be rotated by the handle. The shaft rotates in conjunction with the rotation of the handle, and moves back and forth in the axial direction of the shaft by engaging with the female thread on the inner surface of the cylinder, and the plunger can be moved back and forth in the axial direction via the plunger flange provided at the distal end of the plunger, which contacts the shaft at its tip. Medical balloon inflator.

11. In any one of claims 1 to 9, The predetermined value is set to 2 Nm. Medical balloon inflator.

12. In any one of claims 1 to 9, The syringe is detachably attached to the syringe holder. Medical balloon inflation kit.

13. A medical balloon inflator having a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder is located proximal to the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is located distal to the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle positioned along the central axis and rotating about the central axis, and has a torque limiting function that prevents the handle from rotating freely and transmitting the torque to the motion conversion mechanism when the torque rotating the handle exceeds a predetermined value set so as not to burst the balloon. The support member is composed of two support members that are symmetrical with respect to the central axis, and the syringe holder and the motion conversion mechanism are each supported by these two support members. Medical balloon inflator.

14. In claim 13, The syringe holder is detachably supported by the two support members. Medical balloon inflator.

15. In claim 13, The motion conversion mechanism is detachably supported by the two support members. Medical balloon inflator.

16. In claim 13, The motion conversion mechanism has a pusher provided along the rotation axis of the driver and connected to the plunger flange of the syringe, The normal state controls the pushing and pulling of the plunger into the syringe by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates, Regardless of the rotation of the driver, it is possible to switch between a rapid decompression state that allows the plunger of the syringe to be withdrawn and a state that allows for rapid decompression. Medical balloon inflator.

17. A reusable medical balloon inflator for inflating a spinal balloon used in surgery to expand a spinal balloon to create a cement-filled space within a fractured vertebra, comprising a syringe holder, a motion conversion mechanism, a driver, and a support member, The syringe holder, the motion conversion mechanism, and the driver are arranged on the same axis. The syringe holder is located proximal to the support member and can detachably support a syringe having a syringe and a plunger. The motion conversion mechanism is located distal to the support member along the central axis of the syringe and the plunger, and can convert the rotational force of the driver into a force that pushes the plunger of the syringe. The driver has a handle that rotates about the central axis, and when the internal pressure of the syringe increases due to the torque of rotating the handle, it has a torque limiting function that prevents the torque from being transmitted to the motion conversion mechanism when the torque value exceeds a predetermined value set to prevent the internal pressure of the syringe from reaching a predetermined internal pressure and rupturing the balloon. The support member comprises two support members symmetrical with respect to a central axis, and supports the syringe holder and the motion conversion mechanism so that the relationship between torque and internal pressure is substantially linear until the internal pressure of the syringe reaches the predetermined internal pressure as the driver rotates, thereby suppressing the twisting of the motion conversion mechanism due to the rotation of the driver. Medical balloon inflator.

18. In claim 17, The syringe holder is detachably supported by the two support members. Medical balloon inflator.

19. In claim 17, The motion conversion mechanism is detachably supported by the support member. Medical balloon inflator.

20. In claim 17, The motion conversion mechanism has a pusher provided along the rotation axis of the driver and connected to the plunger flange of the syringe, The normal state controls the pushing and pulling of the plunger into the syringe by changing the distance between the syringe fixed to the syringe holder and the pusher as the driver rotates, Regardless of the rotation of the driver, it is possible to switch between a rapid decompression state that allows the plunger of the syringe to be withdrawn and a state that allows for rapid decompression. Medical balloon inflator.

21. In claim 17, The motion conversion mechanism comprises a cylinder with an internal thread formed on its inner surface, and a shaft having an internal thread that engages with the internal thread on the inner surface of the cylinder and passing through the cylinder. The driver can rotate the shaft using the handle. The shaft rotates in conjunction with the rotation of the handle, moves back and forth in the axial direction of the shaft by engaging with the female thread on the inner surface of the cylinder, and the plunger can be moved back and forth in the axial direction via the plunger flange provided on the distal side of the plunger, which contacts the shaft at its tip. Medical balloon inflator.

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