Dilation device and vertebroplasty dilation apparatus

Abstract

The application discloses an expansion device, and relates to the technical field of medical devices, which comprises a handle, an outer tube, an inner tube, a balloon and a cutting mechanism. The outer tube is connected with the handle, and the inner tube penetrates through the handle and is connected with the outer tube, and the inner tube is used for conveying fluid into the balloon. The balloon is connected with the inner tube through a one-way valve, and the balloon is used for expanding to realize dislocation bone reduction after fluid infusion. The one-way valve is opened during fluid infusion, and the one-way valve is closed after stopping fluid infusion. The cutting mechanism is arranged between the outer tube and the inner tube, and the cutting mechanism is used for cutting the inner tube after completing fluid infusion. The expansion device does not need to exit the balloon after completing dislocation bone reduction, so that the loss of the dislocation bone reduction position caused by the pressure relief of the balloon can be avoided, and the operation efficiency can be improved. In addition, the balloon and the one-way valve form a closed structure, so that leakage can be avoided during fluid injection, and the operation risk is reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an expansion device. This application also relates to a vertebral body shaping expansion device incorporating the expansion device. Background Technology

[0002] When a patient's bones are damaged or diseased, the distance between them may decrease. In such cases, it is often necessary to separate the closely spaced bones and maintain their fixation for a certain period of time. The commonly used device for this separation is a balloon. During use, the balloon needs to be injected with fluid to inflate it and thus separate the bones. However, existing balloons still need to be withdrawn after insertion, reducing surgical efficiency. Furthermore, during the decompression process, the "rebound" effect of the balloon can cause the bones to collapse again due to the inability to maintain their position.

[0003] For example, osteoporotic vertebral compression fractures are one of the most common healthcare problems worldwide. They are closely related to age-related osteoporosis. These fractures are difficult to treat, have poor prognosis, and high rates of disability and mortality. They are a key issue of concern in orthopedic treatment and related research.

[0004] In existing techniques, percutaneous kyphoplasty (PKP) is currently the main minimally invasive surgical method used to treat osteoporotic vertebral compression fractures. This technique involves inserting a balloon into a specific location within the patient's body via a catheter, then injecting fluid to inflate the balloon and restore vertebral height. The balloon is then depressurized and removed, and finally, bone cement is injected to enhance vertebral strength and stability. However, the balloon still needs to be withdrawn after insertion, reducing surgical efficiency. Furthermore, during the depressurization process, the balloon's "rebound" effect can cause the vertebral body to collapse again due to loss of height, resulting in unsatisfactory reduction. In addition, the free injection of bone cement into the expanded cavity still carries a high risk of bone cement leakage.

[0005] Therefore, it is necessary for those skilled in the art to provide a timely solution that can improve surgical efficiency and avoid the inability of the bone to be maintained and re-collapsed due to the "rebound" effect of the balloon. Summary of the Invention

[0006] The purpose of this application is to provide an expansion device that can improve surgical efficiency and minimize the risk of bone collapse due to balloon "rebound." Another purpose of this application is to provide a vertebroplasty expansion device that includes the above-mentioned expansion device.

[0007] To achieve the above objectives, this application provides an expansion device, comprising:

[0008] handle;

[0009] Outer tube, connecting handle;

[0010] an inner tube penetrating the outer tube for delivering fluid;

[0011] a balloon connected with the inner tube through a one-way valve for expanding to achieve dislocation bone reduction after the fluid is filled, the one-way valve being used for opening when the fluid is filled and closing after the fluid is stopped;

[0012] a cutting mechanism arranged between the outer tube and the inner tube for cutting the inner tube after the fluid is filled.

[0013] In some embodiments, an activity module is further included, the activity module being movably connected with the handle, and the activity module being used for driving the cutting mechanism to cut the inner tube.

[0014] In some embodiments, the cutting mechanism includes a blade rod and a blade arranged on the blade rod, and the extending direction of the blade rod has a preset angle with the axial direction of the inner tube.

[0015] The activity module or the outer tube is provided with a limiting member or a limiting structure, the limiting member or the limiting structure being capable of pressing against the outer side surface of the blade rod when the activity module moves axially, so as to realize the cutting of the inner tube by the blade.

[0016] In some embodiments, the cutting mechanism includes blade rods arranged on both sides of the inner tube, one side of the blade rod being provided with a blade, and the other side of the blade rod being provided with a blade groove.

[0017] The activity module is provided with a limiting member or a limiting structure, the limiting member or the limiting structure being capable of pressing against the outer side surface of the blade rod when the activity module moves axially, so that the cutting edge of the blade is pressed into the blade groove to cut the inner tube.

[0018] In some embodiments, the activity module is provided with a limiting member or a limiting structure, and the blade rod is fixed to the handle and penetrates the activity module.

[0019] When the activity module moves along the axial direction of the inner tube, the limiting member or the limiting structure presses against the blade rod, the blade rod approaches the inner tube, and the blade cuts the inner tube.

[0020] In some embodiments, the activity module includes a movable member, and the limiting member is an annular protrusion arranged on the inner wall of the movable member.

[0021] In some embodiments, the inner side surface of the annular protrusion in contact with the blade rod is a plane.

[0022] In some embodiments, the outer tube is provided with a limiting member or a limiting structure, and the blade rod is fixed to the activity module.

[0023] When the activity module drives the blade rod to move along the axial direction of the inner tube, the limiting member or the limiting structure presses against the blade rod, the blade rod approaches the inner tube, and the blade cuts the inner tube.

[0024] In some embodiments, the limiting member is a fixed ring arranged on the inner wall of the outer tube.

[0025] In some embodiments, the activity module further comprises a sliding block arranged on the activity piece, a sliding groove arranged on the handle, and the sliding block is slidingly arranged in the sliding groove and protrudes from the handle.

[0026] In some embodiments, the sliding block is provided with a corrugated surface.

[0027] In some embodiments, the one-way valve is a one-way valve with a valve, which opens when the fluid is injected and closes after the fluid injection is stopped.

[0028] In some embodiments, a pressure pump is further included, which is connected with the inner tube and used to provide power to inject the fluid into the balloon through the inner tube.

[0029] The present application provides a vertebral body augmentation and expansion device, which comprises the expansion device described in any one of the above.

[0030] With respect to the above background technology, the expansion device provided by the embodiments of the present application comprises a handle, an outer tube, an inner tube, a balloon and a cutting mechanism. The outer tube is connected with the handle, and the inner tube penetrates through the outer tube and is used to transport fluid into the balloon, which in turn drives the dislocated bone to complete the reduction. The balloon is connected with the inner tube through a one-way valve, which is used to expand after the fluid injection to achieve the reduction of the dislocated bone. It should be noted that the one-way valve opens when the fluid is injected and closes after the fluid injection is stopped. The cutting mechanism is arranged between the outer tube and the inner tube and is used to cut the inner tube after the fluid injection is completed.

[0031] It can be understood that the expansion device provided by the embodiments of the present application adopts the handle and the outer tube to connect the external structure, and adopts the inner tube, the one-way valve and the balloon to connect the internal structure, so as to realize the transportation of the fluid. Specifically, the balloon is extended into a specific position in the patient's body through the inner tube, then the fluid is injected into the balloon, and the dislocated bone is driven to complete the reduction through the expansion of the balloon. After the fluid injection is completed, the inner tube is cut off by the cutting mechanism, and the balloon and the inner tube are separated, and the balloon remains in the body to maintain the supporting effect. Compared with the traditional device, the expansion device provided by the embodiments of the present application does not need to exit the balloon after the reduction of the dislocated bone is completed, which can avoid the loss of the reduction position of the dislocated bone caused by the pressure relief of the balloon, and can also improve the operation efficiency. In addition, compared with the way that the fluid is freely injected into the expanded cavity, which leads to a high risk of leakage, in the expansion device provided by the embodiments of the present application, the one-way valve opens when the fluid is injected and closes after the fluid injection is stopped, so as to form a one-way flow channel between the inner tube and the balloon, that is, the balloon and the one-way valve form a closed structure, which can ensure that there is no leakage during the fluid injection process, thereby reducing the risk of operation.

[0032] The application provides a vertebral body augmentation and expansion device, which comprises the expansion device described in any one of the above. Compared with a conventional device, the vertebral body augmentation and expansion device provided by the application does not need to exit the balloon after the completion of the vertebral body reduction, so that the loss of the vertebral body reduction height caused by the pressure relief of the balloon can be avoided, and the operation efficiency can be improved. In addition, compared with the mode that the bone cement is freely injected into the expanded cavity, which leads to a high risk of leakage, in the vertebral body augmentation and expansion device provided by the application, the one-way valve is opened when the bone cement is injected and is closed after the injection of the bone cement is stopped, so that a one-way flow channel is formed between the inner tube and the balloon, that is, the balloon and the one-way valve form a closed structure, so that the leakage during the injection of the bone cement can be avoided, and the operation risk can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0034] Figure 1 It is a structural schematic diagram of the expansion device in the application;

[0035] Figure 2 It is Figure 1 It is a structural schematic diagram of the expansion device in the application;

[0036] Figure 3 It is Figure 1 It is a structural schematic diagram of the expansion device in the application;

[0037] Figure 4 It is Figure 1 It is a partial cross-sectional structural schematic diagram of the expansion device in the application;

[0038] Figure 5 It is Figure 4 It is a front view of the structure shown in the application;

[0039] Figure 6 It is Figure 1 It is another partial cross-sectional front view of the expansion device in the application;

[0040] Figure 7 It is a structural schematic diagram of the first cutting mechanism;

[0041] Figure 8 It is a structural schematic diagram of the second cutting mechanism;

[0042] Figure 9 It is a structural schematic diagram of the third cutting mechanism;

[0043] Figure 10 For Figure 9 side view.

[0044] Wherein:

[0045] 10-handle, 20-outer tube, 30-inner tube, 40-balloon, 50-one-way valve, 60-trimming mechanism, 70-movable module;

[0046] 101-slotted;

[0047] 201-fixed ring;

[0048] 501-valve;

[0049] 601-knife bar, 602-knife blade, 603-knife groove;

[0050] 701-movable piece, 702-slid;

[0051] 7011-ring-shaped protrusion, 7021-wavy surface. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0053] The core of the present application is to provide an expansion device, which aims to solve the problem that the bone cannot be maintained and collapses again due to the "springback" effect of the balloon after the balloon is removed in traditional surgery, especially the problem of loss of vertebral body height after the balloon 40 is removed in PKP surgery, eliminates the step of removing the balloon catheter from the body, improves the operation efficiency and reduces the risk of leakage of fluid such as bone cement in the balloon.

[0054] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0055] It should be noted that the "upper end, lower end, left side, right side" and other orientation words described below are defined based on the drawings of the specification.

[0056] The expansion device provided by the embodiments of the present application is used to solve the problem that the bone cannot be maintained and collapses again due to the "springback" effect of the balloon after the balloon is removed in traditional surgery, especially the problem of loss of vertebral body height after the balloon 40 is removed in PKP surgery.

[0057] Please refer to Figure 1The expansion device comprises a handle 10, an outer tube 20, an inner tube 30 and a balloon 40.

[0058] The outer tube 20 is connected to the handle 10, the outer tube 20 is located outside the inner tube 30, the inner tube 30 penetrates the outer tube 20 and is connected to the balloon 40, the inner tube 30 is used to deliver fluid into the balloon 40, and the fluid enters the balloon 40 to drive the dislocated bone (referring to the bone out of the normal position or relative position) to complete the reduction; the balloon 40 is connected to the inner tube 30 through a one-way valve 50, the balloon 40 is used to expand after being filled with fluid to achieve the reduction of the dislocated bone, the balloon 40 has a closed structure at the end and is folded after being processed. It should be noted that the one-way valve 50 is opened when the fluid is filled, and the one-way valve 50 is closed after the fluid filling is stopped. Figure 1 The one-way valve 50 is arranged at this position only as an embodiment of the specific position, and can also be arranged at other positions.

[0059] It should be noted that, as an embodiment, Figure 4 The inner tube 30 shown in the figure also penetrates the handle 10, that is, an outlet is arranged at the tail end of the handle 10, of course, the outlet can also be arranged at other positions of the handle 10, for example, the outlet can be arranged at one side of the handle 10, provided that the movement of the movable module 70 does not interfere with the movement.

[0060] It should be noted that the fluid can be bone cement, physiological saline and the like, and the bone cement is selected when applied to the PKP operation. The biodegradable developing agent is added to the fluid, and the fluid is filled into the balloon 40 to drive the dislocated bone to complete the reduction.

[0061] Further, please refer to Figure 4 In order to facilitate the disconnection of the balloon 40 and the inner tube 30, the expansion device further comprises a cutting mechanism 60 arranged between the outer tube 20 and the inner tube 30, and the cutting mechanism 60 is used to cut the inner tube 30 after the fluid filling is completed.

[0062] It can be understood that the expansion device provided by the embodiment of the application has the following advantages. The outer structure of the expansion device is connected by the handle 10 and the outer tube 20, the inner structure is connected by the inner tube 30, the one-way valve 50 and the balloon 40, so as to achieve the delivery of the fluid. Specifically, the balloon 40 is extended into a specific position in the patient's body through the inner tube 30, then the fluid is filled into the balloon 40 to drive the dislocated bone to complete the reduction through the expansion of the balloon 40, after the fluid filling is completed, the pressure is released, then the inner tube 30 is cut off by the cutting mechanism 60, the balloon 40 and the inner tube 30 are separated, and the balloon 40 and the one-way valve 50 remain in the body to maintain the supporting effect.

[0063] It should be noted that the handle 10 and the outer tube 20 can be an integral structure, or can be a split structure, and when being a split structure, can be fixedly connected through gluing, sleeving, threading, etc. At this time, the handle 10 is provided with a connecting section with a smaller outer diameter at the end, and is glued, sleeved, threaded, etc. with the outer tube 20 through the connecting section.

[0064] Compared with the traditional device, the expansion device provided in the embodiment of the application does not need to exit the balloon 40 after completing the reduction of the dislocated bone, so that the loss of the vertebral body reduction position caused by the pressure relief of the balloon 40 can be avoided, and the operation efficiency can be improved.

[0065] In addition, compared with the way that the fluid is freely perfused into the expanded cavity, which leads to a higher risk of leakage, in the expansion device provided in the embodiment of the application, the one-way valve 50 is opened when the fluid is perfused and is closed after the fluid is stopped, so as to form a one-way flow channel between the inner tube 30 and the balloon 40, that is, the balloon 40 and the one-way valve 50 form a closed structure, so that leakage can be prevented during the fluid injection process, and the operation risk can be reduced.

[0066] In some embodiments, the expansion device further comprises a pressure pump connected with the inner tube 30, and the pressure pump is used to provide power to inject the fluid into the balloon 40 through the inner tube 30.

[0067] Of course, according to actual needs, the balloon 40 and the one-way valve 50 are made of degradable materials, such as polylactic acid, polyvinyl alcohol or polyethylene glycol, and the balloon 40 and the one-way valve 50 can be made of the same material. The inner tube 30 can be made of degradable materials, such as polylactic acid, polyvinyl alcohol or polyethylene glycol, or can be made of non-degradable materials, such as nylon materials.

[0068] In some embodiments, the one-way valve 50 is a one-way valve with a valve 501, which is opened when the fluid is perfused and is closed after the fluid is stopped.

[0069] Specifically, please refer to Figure 2 and Figure 3 The one-way valve 50 is similar to a tricuspid valve structure, that is, the valve 501 is provided with three valve 501. In this way, the fluid flows through the inner tube 30 under the action of the pressure pump to impact the valve 501 to make the one-way valve 50 in the on state; when the pressure pump stops working, the one-way valve 50 is closed, and the fluid cannot continue to flow back into the inner tube 30 from the balloon 40.

[0070] The balloon 40 of the above expansion device is in a folded state in a non-working state, and the one-way valve 50 is closed. In a working state, the one-way valve 50 is connected, the balloon 40 is inflated with the fluid, and then the fractured dislocated bone is reduced. After the fluid is filled, the balloon 40 is separated from the inner tube 30 through the cutting mechanism 60, and the balloon 40 is left at the bone to form a stable support.

[0071] In some embodiments, referring to Figure 4 and Figure 5 , the expanding device further comprises a movable module 70 movably connected to the handle 10, and the movable module 70 is used to drive the cutting mechanism 60 to cut the inner tube 30.

[0072] In some embodiments, the cutting mechanism 60 comprises a blade rod 601 and a blade 602 arranged on the blade rod 601, and the extending direction of the blade rod 601 has a preset angle with the axial direction of the inner tube 30. In order to facilitate the cutting of the inner tube 30, a limiting member or a limiting structure can be arranged on the movable module 70 or in the outer tube 20, and the limiting member or the limiting structure can press against the outer side of the blade rod 601 when the movable module 70 moves axially, so as to realize the cutting of the inner tube 30 by the blade 602.

[0073] It should be noted that the so-called preset angle can be understood as that the end of the blade rod 601 close to the blade 602 is arranged to be inclined upward, and the preset angle can ensure that the blade 602 does not affect or substantially damage the inner tube 30 in the process of non-cutting; at the same time, the limiting member or the limiting structure can ensure that the blade 602 presses downward and cuts the inner tube 30 when the movable module 70 moves.

[0074] It can be understood that when the limiting member or the limiting structure is arranged on the movable module 70, the movable module 70 comprises a movable part 701, the limiting structure is a structure integrally arranged with the movable part 701, and the limiting member is a component fixed to the movable part 701. Specifically, the limiting structure can be a protruding structure formed by the end of the movable part 701 extending radially, or can be the end of the movable part 701 extending, and the limiting member can be a protrusion arranged on the inner wall of the movable part 701. When the limiting member or the limiting structure is arranged in the outer tube 20, the limiting member is a protrusion on the inner wall surface of the outer tube 20, and the limiting structure is a protruding structure extending radially inward on the inner wall surface of the outer tube 20 when the outer tube 20 is formed.

[0075] In some embodiments, when the movable module 70 is provided with the limiting member or the limiting structure, the blade rod 601 can be fixed to the handle 10, and the blade rod 601 penetrates through the movable module 70; in this way, when the movable module 70 moves along the axial direction of the inner tube 30, the limiting member or the limiting structure on the movable module 70 presses against the blade rod 601, the blade rod 601 approaches the inner tube 30, and the blade 602 cuts the inner tube 30.

[0076] It can be understood that when the movable module 70 moves forward along the axial direction of the inner tube 30, the limiting member or the limiting structure on the movable module 70 can provide a downward component force to the blade rod 601 due to the upward inclination of the front end of the blade rod 601 (the end of the blade rod 601 close to the blade 602), so that the blade rod 601 moves close to the inner tube 30, thereby making the blade 602 cut the inner tube 30.

[0077] It should be noted that in the initial state, the upper and lower blades 602 are opened, and the inner tube 30 passes through the middle, ensuring that the cutter bar 601 has a certain slope, so that when the movable module 70 moves horizontally, it can press down the blades 602 to complete the cutting action.

[0078] In some embodiments, the width of the upper and lower blades 602 is greater than or equal to half the circumferential dimension of the outer diameter of the inner tube 30 at the cutting position. It can be understood that the outer diameter of the inner tube 30 is not necessarily the same.

[0079] On the basis of the above, the limiting member can be an annular protrusion 7011 provided on the inner wall of the movable member 701. When the movable member 701 moves forward, the annular protrusion 7011 presses against the cutter bar 601 to achieve the cutting of the inner tube 30 by the blades 602.

[0080] In some embodiments, the inner side surface of the annular protrusion 7011 in contact with the cutter bar 601 is an arc surface. At this time, the outer side surface of the cutter bar 601 can also be provided with an arc surface matched therewith. In this way, the contact area between the inner side surface of the annular protrusion 7011 and the outer side surface of the cutter bar 601 can be increased, and the downward pressing force transmitted to the cutter bar 601 can be more evenly distributed.

[0081] In some embodiments, the inner side surface of the annular protrusion 7011 in contact with the cutter bar 601 is a flat surface.

[0082] It can be understood that setting the inner side surface of the annular protrusion 7011 in contact with the outer side surface of the cutter bar 601 as a flat surface can increase the contact area between the inner side surface of the annular protrusion 7011 and the outer side surface of the cutter bar 601, and the downward pressing force transmitted to the cutter bar 601 can be more evenly distributed. In comparison, if the inner side surface of the annular protrusion 7011 is a circular arc surface and the outer side surface of the cutter bar 601 is a flat surface, the circular arc surface and the outer side surface of the cutter bar 601 are in point contact (2 points on the upper cutter bar 601 and 2 points on the lower cutter bar 601). If the force on the 2 points on the upper cutter bar 601 or the lower cutter bar 601 is not consistent, it will lead to uneven cutting edges and even the problem of not being able to cut completely.

[0083] In some embodiments, the movable module 70 further comprises a sliding block 702 provided on the movable member 701, and the handle 10 is provided with a sliding groove 101, the sliding block 702 is slidingly arranged in the sliding groove 101, and the sliding block 702 protrudes from the handle 10. At the same time, the part of the sliding block 702 protruding from the handle 10 is provided with a corrugated surface 7021 for increasing the friction with the hand.

[0084] As an implementation, the slider 702 is wrapped by the inner wall of the handle 10, the outer lateral surface of the slider 702 is a cylindrical surface, the inner lateral surface of the handle 10 cooperates with the outer lateral surface of the slider 702, and the two can axially slide. With this structure, it is convenient to process, and when the slider 702 needs to move forward and backward under the action of an external force, the force applied will have a downward component force. Through this structure, the downward component force can be dispersed to the inner lateral surface of the handle 10, thereby ensuring smooth movement of the slider 702.

[0085] Of course, the above setting mode is only one of the implementation modes, and other setting modes can also be used, for example, the rear end (the end close to the handle 10) of the blade rod 601 is arranged on the movable module 70, and a ring with a fixed inner diameter is arranged at a certain position of the outer tube 20.

[0086] Specifically, referring to Figure 6 , when the outer tube 20 is provided with a limiting member or a limiting structure, the blade rod 601 is fixed to the movable module 70, the shape of the blade rod 601 is unchanged, and the distance between the blade rod 601 and the inner tube 30 gradually decreases from the front end to the rear end. In this way, the blade rod 601 is driven to move forward and backward by the forward and backward movement of the movable module 70, and when the blade rod 601 is controlled to move backward by the movable module 70 (when the blade rod 601 is pulled backward), the blade rod 601 is pressed by the limiting member or the limiting structure, so that the blade rod 601 is close to the inner tube 30 to cut. As a preferred solution, the extension direction of the blade 602 forms an acute angle with the extension direction of the blade rod 601, so that the blade 602 is bent inward, and the cutting effect is better when the blade 602 moves backward.

[0087] As a preferred solution, the limiting member is a fixed ring 201 arranged on the inner wall of the outer tube 20. In this way, when the movable module 70 drives the blade rod 601 to move along the axis direction of the inner tube 30, the fixed ring 201 can press the blade rod 601, so that the blade 602 cuts the inner tube 30.

[0088] In some embodiments, referring to Figure 7 , the cutting mechanism 60 adopts the above setting mode and includes two blade rods 601 arranged above and below, and the two blade rods 601 are each provided with a blade 602. The two blades 602 are relatively moved to cut the inner tube 30.

[0089] Of course, according to actual application needs, referring to Figure 8 , the cutting mechanism 60 can also be arranged in other modes, for example, the cutting mechanism 60 includes blade rods 601 arranged on both sides of the inner tube 30, one side of the blade rod 601 is provided with a blade 602, and the other side of the blade rod 601 is provided with a blade groove 603. The blade 602 and the blade groove 603 jointly act on the inner tube 30 to generate a cutting force on the inner tube 30, so as to realize the cutting of the inner tube 30.

[0090] Referring to Figure 4 andFigure 5 The restriction member or structure is capable of pressing against the outer side of the cutter bar 601 when the movable module 70 moves axially, so that the blade 602 and the blade groove 603 move towards the inner tube 30. With the continuous axial movement of the movable module 70, the blade 602 and the blade groove 603 contact the inner tube 30 and gradually generate a cutting force on the inner tube 30, and finally cut the inner tube 30. The blade 602 and the blade groove 603 rotate with the axial movement of the movable module 70. In order to ensure the cutting effect, the tangent direction of the movement track of the blade edge of the blade 602 and the extension direction of the blade groove 603 at the time when the blade 602 and the blade groove 603 cut the inner tube 30 or contact the inner tube 30 are basically perpendicular to the inner tube 30. The movement track of the blade edge of the blade 602 is between the two side walls of the blade groove 603.

[0091] Further, please refer to Figure 9 and Figure 10 , on the basis of the blade 602 on one side and the guide groove 603 on the other side, the blade edge of the blade 602 is convex, and the guide groove 603 is concave.

[0092] As preferred, the blade edge is convex, and the blade edge has an included angle, so that when the blade edge is pressed down, the blade tip first contacts the inner tube 30, and the shear force applied to the inner tube 30 is larger than that of a flat blade edge. At the same time, the inner tube 30 is first cut by the blade tip to form an opening, and then the blade edge is pressed down for shearing, which has a better effect. Preferably, Figure 10 The distance between the blade tip and the inner tube 30 is basically the same as the distance between the upper surface of the blade groove 603 first contacting the inner tube 30 and the inner tube 30.

[0093] In summary, when the above-mentioned expansion device is used, the fluid added with the biodegradable developing agent is input by the pressure pump and enters the balloon 40 through the inner tube 30 to inflate the balloon 40, thereby driving the compressed dislocated bone to be reset. The inflation degree of the balloon 40 is observed by X-ray film, and when the dislocated bone is reset to the ideal position, the connection between the balloon 40 and the inner tube 30 is cut off by the movable module 70 to control the cutting mechanism 60, and the balloon 40 is left at the dislocated bone to form stable support.

[0094] The vertebral body augmentation and expansion device provided in the present application is used for treating osteoporotic vertebral compression fractures of a patient, and the vertebral body augmentation and expansion device comprises the expansion device described in the above-mentioned specific embodiments.

[0095] When the vertebral body augmentation and expansion device of the present application is applied, the dislocated bone mentioned in the embodiments is a vertebral body, and the fluid therein is bone cement.

[0096] It should be noted that the relational terms such as first and second, and the like, used in the present specification are only used to differentiate one entity from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0097] The above describes the expansion device and the vertebroplasty expansion device with the expansion device provided by the present application in detail. The principles and implementation manners of the present application are described by using specific examples, and the above description of the examples is only used to help understand the scheme of the present application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An expansion device, characterized in that, include: Handle (10); The outer tube (20) is connected to the handle (10); The inner tube (30) penetrates the outer tube (20) and is used to transport fluid; The balloon (40) is connected to the inner tube (30) via a one-way valve (50) for expansion after infusion of fluid, the one-way valve (50) being used to open during infusion and close after infusion of fluid is stopped; A cutting mechanism (60) is provided between the outer tube (20) and the inner tube (30) for cutting the inner tube (30) after fluid injection is completed. The active module (70) is movably connected to the handle (10) for moving along the axial direction of the inner tube (30) to drive the cutting mechanism (60) to cut the inner tube (30).

2. The expansion device as claimed in claim 1, characterized in that, The cutting mechanism (60) includes a blade (601) and a blade (602) disposed on the blade (601). The extension direction of the blade (601) has a preset angle with the axial direction of the inner tube (30). The active module (70) or the outer tube (20) is provided with a limiting member or a limiting structure. The limiting member or the limiting structure can press against the outer side of the cutter bar (601) when the active module (70) moves axially, so that the blade (602) can cut the inner tube (30).

3. The expansion device as claimed in claim 1, characterized in that, The cutting mechanism (60) includes blades (601) located on both sides of the inner tube (30), with one side of the blade (601) having a blade (602) and the other side of the blade (601) having a blade groove (603). The active module (70) is provided with a limiting member or a limiting structure. When the active module (70) moves axially, the limiting member or the limiting structure can press against the outer side of the cutter bar (601), so that the cutting edge of the blade (602) is pressed into the cutting groove (603) to cut the inner tube (30).

4. The expansion device as described in claim 2, characterized in that, The active module (70) is provided with the limiting member or the limiting structure, the tool bar (601) is fixed to the handle (10), and the tool bar (601) passes through the active module (70). When the active module (70) moves along the axial direction of the inner tube (30), the limiting member or the limiting structure presses against the knife bar (601), the knife bar (601) moves closer to the inner tube (30), and the blade (602) cuts the inner tube (30).

5. The expansion device as described in claim 4, characterized in that, The active module (70) includes an active component (701), and the limiting component is an annular protrusion (7011) provided on the inner wall of the active component (701).

6. The expansion device as claimed in claim 5, characterized in that, The inner surface of the annular protrusion (7011) that contacts the tool holder (601) is a plane.

7. The expansion device as claimed in claim 2, characterized in that, The outer tube (20) is provided with the limiting member or the limiting structure, and the knife bar (601) is fixed to the movable module (70). When the active module (70) drives the cutter bar (601) to move along the axial direction of the inner tube (30), the limiting member or the limiting structure presses against the cutter bar (601), and the cutter bar (601) moves closer to the inner tube (30), causing the blade (602) to cut the inner tube (30).

8. The expansion device as claimed in claim 7, characterized in that, The limiting element is a fixing ring (201) disposed on the inner wall of the outer tube (20).

9. The expansion device as claimed in claim 5, characterized in that, The active module (70) also includes a slider (702) disposed on the active component (701), and the handle (10) is provided with a groove (101). The slider (702) is slidably disposed in the groove (101), and the slider (702) protrudes from the handle (10).

10. The expansion device as claimed in claim 9, characterized in that, The slider (702) is provided with a corrugated surface (7021).

11. The expansion device according to any one of claims 1-10, characterized in that, The one-way valve (50) is a one-way valve valve, which has a valve (501) that opens when fluid is injected and closes when fluid injection stops.

12. The expansion device according to any one of claims 1-10, characterized in that, It also includes a pressure pump connected to the inner tube (30), which provides power to inject fluid through the inner tube (30) into the balloon (40).

13. A cone-shaped expansion device, characterized in that, Includes the expansion device as described in any one of claims 1-12.

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