Balloon catheter assembly

Abstract

The present application relates to the technical field of medical devices, and in particular to a balloon catheter assembly, which comprises an outer catheter assembly, an inner catheter assembly, a balloon and a locking assembly, the inner catheter assembly is arranged in the outer catheter assembly; the distal end of the balloon is connected with the distal end of the inner catheter assembly, and the proximal end of the balloon is connected with the distal end of the outer catheter assembly; the balloon, the outer catheter assembly and the inner catheter assembly form a filling cavity; the inner catheter assembly can move axially along the outer catheter assembly to stretch the balloon or release the balloon; the locking assembly is arranged between the outer catheter assembly and the inner catheter assembly, and when the inner catheter assembly moves axially along the outer catheter assembly to stretch the balloon to a predetermined stretching degree, the inner catheter assembly is automatically locked to the outer catheter assembly, so that the balloon is kept at the predetermined stretching degree. In the embodiment of the present application, the balloon is kept at the predetermined stretching degree when the surgery is ready to be performed, so as to reduce the stretching time of the balloon before the surgery and improve the problem that the elasticity of the balloon is lost due to long-time stretching.

Description

A balloon catheter assembly Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a balloon catheter assembly. Background Technology

[0002] A balloon catheter is a medical interventional device whose main functions are to dilate blood vessels, tissues, cavities, valves, and to act as a space-occupying agent. It is widely used in cardiovascular, neurosurgery, urology, gynecology and other fields.

[0003] The diameter of the balloon in existing balloon catheters is larger than the diameter of the catheter. Before use, the balloon needs to be folded or stretched to reduce its diameter, so that the balloon catheter can be smoothly inserted into the lesion site and smoothly withdrawn.

[0004] However, after the balloon catheter is assembled, the balloon is always in a stretched state. The balloon material will lose its elasticity due to the long-term stretching of the balloon, causing the balloon to fail. As a result, it will be unable to compress, expand and support the lesion site, leading to surgical failure. Summary of the Invention

[0005] The present invention aims to provide a balloon catheter assembly that improves the problem of balloons losing elasticity due to prolonged stretching.

[0006] To solve the above-mentioned technical problems, one technical solution adopted in this invention is as follows: a balloon catheter assembly is provided, the balloon catheter assembly including an outer catheter assembly, an inner catheter assembly, a balloon, and a locking assembly; the inner catheter assembly passes through the outer catheter assembly; the distal end of the balloon is connected to the distal end of the inner catheter assembly, and the proximal end of the balloon is connected to the distal end of the outer catheter assembly; the balloon, the outer catheter assembly, and the inner catheter assembly form an inflation cavity; the inner catheter assembly can move axially along the outer catheter assembly to stretch or release the balloon; the locking assembly is disposed between the outer catheter assembly and the inner catheter assembly, and when the inner catheter assembly moves distally along the axial direction of the outer catheter assembly to stretch the balloon to a predetermined stretching degree, the inner catheter assembly is automatically locked to the outer catheter assembly, so that the balloon is maintained at the predetermined stretching degree.

[0007] In some embodiments, the locking component may also unlock the inner catheter assembly and release the balloon when the inner catheter assembly is locked to the outer catheter assembly.

[0008] In some embodiments, the locking assembly includes a locking head and a locking mechanism; the locking head is disposed at the proximal end of the inner catheter assembly, and the locking mechanism is disposed at the proximal end of the outer catheter assembly and communicates with the outer catheter assembly; the locking head contacts the locking mechanism and automatically locks itself onto the locking mechanism when the inner catheter assembly moves distally.

[0009] In some embodiments, the locking head has a locking groove or a locking protrusion; the locking mechanism includes a lock body and an elastic element, the lock body is disposed at the proximal end of the external conduit assembly, the elastic element is disposed in the lock body, and the elastic element is used to adapt and engage with the locking groove or the locking protrusion.

[0010] In some embodiments, the locking mechanism further includes a locking ring movably disposed at the proximal end of the lock body, the locking ring being used to compress the elastic member so that the elastic member can disengage from the lock groove or the locking protrusion.

[0011] In some embodiments, a push plate is provided at the proximal end of the locking ring, and the push plate is spaced apart from the lock body.

[0012] In some embodiments, the inner wall of the lock body is provided with a sliding groove, and the outer wall of the lock ring is provided with a limiting protrusion, the limiting protrusion being at least partially located within the sliding groove.

[0013] In some embodiments, the elastic element includes a mounting portion and a locking portion. The mounting portion is disposed on the lock body, one end of the locking portion is connected to the mounting portion, and the other end of the locking portion is used to engage with the lock groove or the locking protrusion.

[0014] In some embodiments, the other end of the locking portion extends toward the internal catheter assembly and bends or folds toward the distal end of the internal catheter assembly.

[0015] In some embodiments, the internal catheter assembly includes an internal catheter and a lens assembly; the internal catheter is centrally located and passes through the external catheter assembly, the internal catheter has an internal catheter lumen, the distal end of the internal catheter is sealed and connected to the distal end of the balloon, and the lens assembly is disposed at the distal end of the internal catheter.

[0016] In some embodiments, the inner catheter assembly further includes a damping assembly; the damping assembly includes a damping element and an end cap; the end cap is disposed at the proximal end of the inner catheter, the end cap having a passage and communication with the inner catheter, and the damping element being disposed inside the end cap.

[0017] In some embodiments, the external catheter assembly includes a connector, an external catheter, and a seal; the connector is centrally located and its distal end is sealed to the proximal end of the external catheter, and has an inflation port; the external catheter is centrally located and communicates with the connector, and its distal end is sealed to the proximal end of the balloon; the seal is installed in the inner cavity of the connector to seal the gap between the connector and the internal catheter.

[0018] Unlike related technologies, the balloon catheter assembly of this invention is equipped with an automatic locking component. The locking component is used to automatically lock the inner catheter assembly to the outer catheter assembly when the inner catheter assembly is moved into position along the axial direction, so that the balloon is kept at a predetermined stretch level. The surgeon can complete the operation with one hand, which is simple and convenient and facilitates the surgeon's operation. Thus, the balloon can be kept in a released state before the operation, so as to reduce the stretching time of the balloon before the operation and improve the problem of the balloon losing elasticity due to prolonged stretching.

[0019] Because the internal catheter assembly has a central internal catheter lumen into which the endoscope assembly can be inserted, and a lens assembly is provided at the front end to provide a visual observation field for the endoscope, the balloon catheter assembly can be used in conjunction with the endoscope assembly for a visualized puncture function. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 is a schematic diagram of the balloon catheter assembly according to an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of a balloon catheter assembly according to an embodiment of the present invention;

[0023] Figure 3 is a magnified view of part B in Figure 2;

[0024] Figure 4 is a magnified view of part C in Figure 2;

[0025] Figure 5 is a partial cross-sectional view of the locking mechanism and locking head in Figure 2.

[0026] Figure 6 is a magnified view of part A in Figure 2.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 100. Balloon catheter assembly;

[0029] 1. Connecting base; 11. Connecting hole; 12. Pressurization hole;

[0030] 2. External catheter; 3. Internal catheter; 4. Balloon; 41. Internal fastener;

[0031] 5. Locking head; 51. Locking groove;

[0032] 6. Locking mechanism; 61. Lock body; 611. Slide groove; 62. Elastic element; 621. Mounting part; 622. Locking part; 63. Locking ring; 631. Limiting protrusion; 632. Push plate;

[0033] 7. Seals; 8. Damping assembly; 81. Damping component; 82. End cap;

[0034] 9. Lens assembly; 91. Lens mount; 92. Lens element. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the various features in the embodiments of this invention can be combined with each other, all of which are within the protection scope of this invention. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed with a different module division or in a different order than that shown in the device schematic diagram or the flowchart.

[0036] In the description of this invention, it should be noted that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0039] The terms "proximal end" and "distal end" used in the embodiments of this specification are relative to the operator or user during use. "Proximal end" refers to the end closer to the operator, and "distal end" refers to the end farther from the operator. They are not intended to limit the invention.

[0040] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0041] To address the aforementioned technical problems, as shown in Figures 1 and 2, this embodiment of the invention provides a balloon catheter assembly 100. The balloon catheter assembly 100 includes a connector 1, an outer catheter 2, an inner catheter 3, a balloon 4, a locking head 5, a locking mechanism 6, a sealing element 7, a damping assembly 8, and a lens assembly 9. Specifically, the connector 1, outer catheter 2, and sealing element 7 constitute the outer catheter assembly; the locking head 5 and locking mechanism 6 constitute the locking assembly; and the inner catheter 3, damping assembly 8, and lens assembly 9 constitute the inner catheter assembly. In other words, the balloon catheter assembly 100 includes the outer catheter assembly, the inner catheter assembly, the balloon 4, and the locking assembly.

[0042] Next, the specific structures of the above-mentioned connecting seat 1, outer guide tube 2, inner guide tube 3, balloon 4, locking head 5, locking mechanism 6, sealing element 7, damping assembly 8, and lens assembly 9 will be described in turn.

[0043] As shown in Figure 3, the connecting seat 1 has a through-hole, which is a connecting hole 11. The distal end of the connecting seat 1 is sealed to the proximal end of the outer conduit 2. The connecting seat 1 also has a pressurization hole 12 for connecting a pressurization device (not shown). The pressurization hole 12 communicates with the connecting hole 11, thereby communicating with the outer conduit 2 to inject or extract fluid into the outer conduit 2. Optionally, the connecting seat 1 and the outer conduit 2 are bonded together with adhesive.

[0044] As shown in Figure 2, the external catheter 2 has a central external catheter cavity that communicates with the connecting seat 1, and its distal end is sealed to the proximal end of the balloon 4, so that both the external catheter 2 and the balloon 4 are connected to the inflation port 12.

[0045] As shown in Figure 2, the inner catheter 3 has a channel forming within it for the endoscope assembly to pass through. It is sequentially inserted into the connector 1 and the outer catheter 2, and its distal end is sealed to the distal end of the balloon 4. This allows the inner catheter 3 to slide axially along the outer catheter 2 to stretch or release the balloon 4. In other words, the inner catheter assembly is inserted into the outer catheter assembly, has an inner catheter channel, and can move axially along the outer catheter assembly to stretch or release the balloon 4. Optionally, the outer catheter 2 and the inner catheter 3 are made of medical-grade polymer material or metal.

[0046] As shown in Figures 2 and 6, the distal end of the balloon 4 is connected to the distal end of the inner catheter assembly, and the proximal end of the balloon 4 is connected to the distal end of the outer catheter assembly. The balloon 4, the outer catheter assembly, and the inner catheter assembly together form an inflation cavity. In this embodiment, both ends of the balloon 4 are connected to the distal ends of the outer catheter 2 and the inner catheter 3, respectively. The outer catheter 2, the inner catheter 3, and the balloon 4 together form an inflation cavity, and the connecting seat 1 seals the gap between the proximal end of the outer catheter 2 and the inner catheter 3, thus sealing the inflation cavity. Optionally, as shown in Figure 6, the balloon 4 is connected to the inner catheter 3 and the outer catheter 2 via an inner fastener 41.

[0047] Understandably, by supplying fluid into the inflation port 12, the balloon 4 can be inflated, thereby compressing, expanding, and supporting the lesion. By withdrawing fluid from the inflation cavity through the inflation port 12, the balloon 4 can be reduced in size for easy removal from the lesion. Optionally, the balloon 4 is a compliant or semi-compliant balloon, and its shape can be spherical, cylindrical, rugby ball-shaped, gourd-shaped, or other various shapes. Optionally, the balloon 4 is made of rubber. Optionally, the fluid is a contrast agent.

[0048] As shown in Figures 1 to 3, the locking head 5 is installed at the proximal end of the inner catheter assembly, and the locking mechanism 6 is installed at the proximal end of the outer catheter assembly. In this embodiment, the locking head 5 is installed at the proximal end of the inner catheter 3, and the locking mechanism 6 is installed at the proximal end of the connecting seat 1. When the inner catheter 3 slides distally along the axial direction of the outer catheter 2 until the locking head 5 contacts the locking mechanism 6, the locking head 5 automatically locks with the locking mechanism 6, automatically locking the inner catheter 3 to the outer catheter 2, that is, automatically locking the inner catheter assembly to the outer catheter assembly. This allows the balloon 4 to be stretched to a predetermined stretching degree, making the balloon 4 stretched and allowing the surgeon to complete the operation with one hand, simplifying the procedure and facilitating the surgeon's work. Furthermore, the balloon 4 can remain in a released state before surgery, reducing the stretching time of the balloon 4 before surgery. Furthermore, after surgery, the locking head 5 can be unlocked from the locking mechanism 6, thereby unlocking the inner catheter assembly, releasing the balloon 4, further reducing the stretching time of the balloon 4, and improving the problem of the balloon 4 losing elasticity due to prolonged stretching.

[0049] As shown in Figure 4, the locking head 5 has a locking groove 51, which is used to engage with the locking mechanism 6 to lock the locking head 5. Optionally, the locking head 5 is bonded to the inner conduit 3 with adhesive. Optionally, the locking head 5 is annular and communicates with the outer conduit assembly, facilitating connection with the inner conduit 3, and the axis of the locking head 5 coincides with that of the inner conduit 3. Optionally, the locking groove 51 is annular, and the axis of the locking groove 51 coincides with the axis of the locking head 5. The locking head 5 can be installed at any angle on the inner conduit 3 without affecting the position of the locking groove 51 relative to the inner conduit 3. In other embodiments, the locking head 5 may also have a locking protrusion (not shown), which is used to engage with the locking mechanism 6 to lock the locking head 5.

[0050] In some embodiments, the locking head 5 has a plurality of locking grooves 51 or a plurality of locking protrusions, which are spaced apart along the axial direction of the inner catheter 3. Thus, the locking head 5 has a plurality of locking positions relative to the locking mechanism 6, and the inner catheter 3 has a plurality of locking positions relative to the outer catheter 2. By locking to different locking positions, the length of the balloon 4 can be controlled, thereby controlling the length of the balloon 4 in the lesion site and reducing the damage to non-lesion sites during the balloon 4 expansion process.

[0051] As shown in Figure 3, the locking mechanism 6 includes a lock body 61, an elastic element 62, and a locking ring 63. The lock body 61 is used to install the elastic element 62 and the locking ring 63. The elastic element 62 is used to engage with the locking groove 51 or the locking protrusion to lock the inner conduit 3 to the outer conduit 2. The locking ring 63 is used to push the elastic element 62 and disengage the elastic element 62 from the locking groove 51 or the locking protrusion to unlock the inner conduit 3.

[0052] As shown in Figure 3, the lock body 61 is located near the end of the connecting seat 1. Optionally, the lock body 61 is a hollow ring and is connected to the connecting hole 11. The inner guide tube 3 passes through the lock body 61 and extends out of the lock body 61 to facilitate the movement of the inner guide tube 3. Optionally, the lock body 61 is threadedly connected to the connecting seat 1. Optionally, the lock body 61 and the connecting seat 1 are bonded together with adhesive.

[0053] As shown in Figure 3, a groove 611 is provided on the inner sidewall of the lock body 61, which is used for slidingly assembling the locking ring 63. Optionally, the groove 611 is cylindrical, and its axis coincides with the axis of the lock body 61, allowing the locking ring 63 to rotate relative to the lock body 61 about its axis.

[0054] As shown in Figure 3, the elastic element 62 is disposed on the lock body 61 and located between the inner guide tube 3 and the lock body 61. The elastic element 62 is used to adapt and engage with the lock groove 51. The elastic element 62 includes a mounting part 621 and a locking part 622. The mounting part 621 is installed on the inner wall of the lock body 61. One end of the locking part 622 is connected to the mounting part 621, and the other end of the locking part 622 extends toward the inner guide tube 3. As shown in Figure 5, when the inner guide tube 3 moves toward the distal end along the outer guide tube 2, the locking head 5 can contact the locking part 622 and squeeze the part of the locking part 622 that contacts the locking head 5 toward the lock body 61, so that the locking head 5 can continue to move. The locking head 5 continues to move until the locking part 622 partially falls into the lock groove 51, realizing the adaptation and engagement of the elastic element 62 with the lock groove 51, and completing the automatic locking of the locking head 5. By inserting the locking head 5 into the locking mechanism 6, the locking head 5 can be automatically locked. The locking head 5 can be automatically locked with one hand, which facilitates the surgeon's operation.

[0055] As shown in Figure 3, the mounting portion 621 is annular and coaxially arranged with the locking groove 51. The locking portion 622 includes multiple locking portions, which are spaced apart on the inner side of the mounting portion 621 and surround the axis of the mounting portion 621. This makes the elastic force of the elastic member 62 on the locking head 5 more uniform, enhances the snapping effect between the elastic member 62 and the locking groove 51, and facilitates the installation and alignment between the elastic member 62 and the locking head 5.

[0056] As shown in Figure 3, the other end of the locking part 622 extends toward the inner catheter assembly and bends or folds toward the distal end of the inner catheter assembly, i.e., multiple locking parts 622 are combined together in a conical shape. The locking part 622 is located on the distal side of the locking ring 63, so that when the locking part 622 is located in the locking groove 51, the locking part 622 abuts against the locking ring 63, which can prevent the locking head 5 from moving toward the proximal side, and the bent locking part 622 facilitates the locking head 5 to squeeze the elastic member 62 to deform it. Since the balloon 4 is in a stretched state when the inner catheter 3 is in the locked state, it will apply a force toward the proximal side to the inner catheter 3. Therefore, the bent locking part 622 can lock the locking head 5 and improve the problem of the elastic member 62 disengaging from the locking groove 51 due to excessive thrust applied by the balloon 4 to the inner catheter 3, thus improving the stability of the lock.

[0057] As shown in Figure 3, the locking ring 63 is movably disposed at the proximal end of the lock body 61. A limiting protrusion 631 is provided on the outer wall of the locking ring 63. The groove wall of the sliding groove 611 of the lock body 61 protrudes into the lock body 61 relative to the bottom of the groove, forming a stop. The limiting protrusion 631 is at least partially located within the sliding groove 611, cooperating with the stop to movably dispose of the locking ring 63 within the lock body 61. Furthermore, the limiting protrusion 631 can slide within the sliding groove 611 along the axial direction of the lock body 61, thereby allowing the locking ring 63 to move relative to the lock body 61. As shown in Figures 3 and 5, when the locking ring 63 slides along the sliding groove 611, it can compress the locking portion 622 of the elastic member 62, causing the locking portion 622 to bend and deform towards the distal end of the outer guide tube 2, thereby disengaging from the locking groove 51 and unlocking the locking head 5. Thus, by squeezing the locking ring 63, the locking head 5 can be automatically unlocked. Unlocking the locking head 5 can be achieved with one hand, making the operation simple and convenient, and facilitating surgery. Optionally, the slide groove 611 is cylindrical, and its axis coincides with the axis of the lock body 61; the limiting protrusion 631 is annular, and its axis coincides with the axis of the locking ring 63. The limiting protrusion 631 can move within the slide groove 611 along the axial direction of the slide groove 611.

[0058] Furthermore, as shown in Figures 3 and 5, the locking ring 63, in conjunction with the lock body 61, clamps the elastic element 62, which reduces the number of accessories used to fix the elastic element 62, lowers costs, reduces the size of the locking mechanism 6, and improves the problem of the locking ring 63 sliding freely along the slide groove 611. Specifically, when the locking ring 63 is installed on the lock body 61, and the limiting protrusion 631 moves to the furthest position from the distal end of the outer guide tube 2 under the restriction of the slide groove 611, the distal end of the locking ring 63 contacts the elastic element 62, thereby clamping the elastic element 62; and when the locking ring 63 squeezes the elastic element 62, the elastic element 62 deforms, allowing the locking ring 63 to move to the distal end. Optionally, the elastic element 62 is installed within the slide groove 611.

[0059] As shown in Figure 3, a push plate 632 is provided at the proximal end of the locking ring 63. The push plate 632 is spaced apart from the lock body 61 and is used by the user to apply a pushing force to the locking ring 63. Optionally, the push plate 632 is annular.

[0060] The sealing element 7 is installed in the inner cavity of the connecting seat 1 to seal the gap between the connecting seat 1 and the inner catheter 3, so that the balloon 4, the outer catheter assembly, and the inner catheter assembly can surround and form a sealed filling cavity. Optionally, the sealing element 7 is a sealing ring, such as a rubber ring.

[0061] As shown in Figure 4, the damping component 8 is installed at the proximal end of the inner catheter 3 relative to the locking head 5, i.e., on the side of the locking head 5 facing away from the inner catheter 3. The damping component 8 applies pressure to the endoscope assembly used in conjunction with the balloon catheter assembly 100 to prevent the endoscope assembly from sliding along the inner catheter 3. For example, when the endoscope assembly is installed in the inner catheter assembly, the light guide of the endoscope assembly is sequentially inserted into the damping component 8 and the inner catheter lumen of the inner catheter 3. The damping component 8 contacts the light guide, and when the light guide tends to move relative to the damping component 8, the damping component 8 can apply resistance in the opposite direction to the light guide to prevent the endoscope assembly from sliding along the inner catheter 3, thus improving the problem of displacement of the endoscope assembly relative to the inner catheter 3.

[0062] In some embodiments, as shown in FIG4, the damping component 8 is annular. When the endoscope assembly is inserted into the internal conduit 3, the light guide tube passes through the through hole of the damping component 8 so that the damping component 8 can clamp the light guide tube. Further, the damping component 8 is coaxially arranged with the locking head 5 so that the axis of the light guide tube coincides with the axis of the internal conduit 3.

[0063] In some embodiments, as shown in FIG4, the damping assembly 8 includes a damping element 81 and an end cap 82. The end cap 82 is disposed at the proximal end of the inner conduit 3, and passes through and communicates with the inner conduit 3. The damping element 81 is disposed inside the end cap 82, and the damping element 81 is used to contact the light guide tube. Further, both the damping element 81 and the end cap 82 are annular. The inner diameter of the through hole on the end cap 82 is larger than the outer diameter of the light guide tube, and the through hole on the damping element 81 is smaller than the outer diameter of the light guide tube. Optionally, the end cap 82 is threadedly connected to the locking head 5. Optionally, the damping element 81 is a damping ring made of an elastic material, such as rubber.

[0064] As shown in Figure 6, the lens assembly 9 is installed at the distal end of the inner conduit 3 and seals the opening at the distal end of the inner conduit 3. The lens assembly 9 allows light to pass through so that the endoscope assembly can observe the field of view at the end of the lens assembly 9. It can also improve the problem of body fluid entering the inner conduit 3, help maintain the cleanliness of the endoscope assembly, and improve the problem of contaminants attached to the endoscope assembly entering the human body.

[0065] Since the internal catheter assembly has a central internal catheter lumen for the endoscope assembly to insert into, and the endoscope assembly 9 is provided with a lens assembly 9 at the front end of the internal catheter 3 to provide a visual observation field for the endoscope assembly, the balloon catheter assembly 100 can cooperate with the endoscope assembly to achieve a visual puncture function.

[0066] As shown in Figure 6, the lens assembly 9 includes a lens mount 91 and a lens element 92. The lens mount 91 is mounted on the distal end of the inner conduit 3. The lens mount 91 has a through hole, and the lens element 92 is disposed within the through hole of the lens mount 91, so that the lens mount 91 and the lens element 92 seal the opening at the distal end of the inner conduit 3, and light can pass through the lens mount 91 from the lens element 92 to reach the inner conduit 3. Optionally, the lens mount 91 is bonded to the inner conduit 3, and the lens element 92 is bonded to the lens mount 91.

[0067] This invention also provides a balloon catheter device, which includes an endoscope assembly and the aforementioned balloon catheter assembly 100, wherein the endoscope assembly is disposed within the balloon catheter assembly 100. The balloon catheter device possesses the structural features and beneficial effects of the balloon catheter assembly 100. For technical details not described in detail in this embodiment, please refer to the balloon catheter assembly 100 of this invention.

[0068] This invention also provides a surgical method that uses balloon inflation to retract brain tissue, thereby establishing a working channel for intracranial surgery. The method is applied to the balloon catheter device, and the steps include:

[0069] S100: Push the inner catheter 3 to move distally, so that the balloon 4 is in a stretched state and becomes thinner to facilitate entry into the lesion site; the locking head 5 contacts the locking mechanism 6 and automatically locks itself to the locking mechanism 6 to lock the position of the inner catheter 3 relative to the outer catheter 2, so that the balloon 4 is kept at a predetermined stretch level;

[0070] S200: The endoscope assembly is inserted into the connection hole 11 through the damping assembly 8 and into the internal catheter 3, so that the endoscope assembly comes into contact with the lens 92 of the lens assembly 9; light passes through the lens assembly 9 and enters the endoscope assembly, and the image of the distal end of the balloon catheter assembly 100 can be displayed through the display device of the endoscope assembly;

[0071] S300: The balloon catheter assembly 100 is slowly inserted into human tissue, and the tissue at the distal end of the balloon catheter assembly 100 is observed with an endoscope. When the endoscope assembly observes blood clots or lesions, the balloon catheter assembly 100 has been punctured to the predetermined position.

[0072] S400: When the balloon catheter assembly 100 reaches the predetermined position, the external inflation device connects to the inflation port 12 and contrast agent is introduced into the inflation port 12 to inflate the balloon 4, thereby compressing, expanding and supporting the lesion site; during the process, contrast agent can be repeatedly introduced and withdrawn to repeatedly expand the lesion site, which can form a retraction channel in human tissue;

[0073] S500: After dilation, the contrast agent in the balloon 4 is withdrawn, the balloon 4 is contracted, the balloon catheter assembly 100 is then withdrawn, and finally a retraction catheter is inserted into the retraction channel.

[0074] The balloon catheter assembly 100 of this embodiment of the invention is provided with an automatic locking component, including a locking head 5 and a locking mechanism 6. The locking head 5 is disposed on the inner catheter 3, and the locking mechanism 6 is disposed on the outer catheter 2. The locking mechanism 6 is used to automatically lock the inner catheter 3 to the outer catheter 2 when the inner catheter 3 is moved axially into position, thereby locking the inner catheter 3 to the position of the stretching balloon 4, keeping the balloon 4 at a predetermined stretching degree to facilitate the surgeon's operation. Thus, before the operation, the balloon 4 can remain in a released state, reducing the stretching time of the balloon 4; and it can also unlock the inner catheter 3 to release the balloon 4, further reducing the stretching time of the balloon 4 and improving the problem of the balloon 4 losing elasticity due to prolonged stretching. By setting the locking mechanism 6 and the locking head 5 in cooperation, it is possible to... The system allows the surgeon to lock and unlock the inner catheter 3 with one hand, enabling simple and convenient operation. When the locking head 5 has multiple locking grooves 51 or multiple locking protrusions, the inner catheter 3 has multiple locking positions relative to the outer catheter 2. By locking it in different positions, the length of the balloon 4 can be controlled, thereby controlling the length of the balloon 4 in the lesion site and reducing damage to non-lesion sites during balloon 4 expansion. A damping component 8 is provided to prevent the endoscope assembly from sliding along the inner catheter 3, improving the problem of displacement of the endoscope assembly relative to the inner catheter 3. A lens assembly 9 is provided to improve the problem of body fluid entering the inner catheter 3, which is beneficial for maintaining the cleanliness of the endoscope assembly and improving the problem of contaminants attached to the endoscope assembly entering the human body.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A balloon catheter assembly, characterized in that, include: An external catheter assembly, an internal catheter assembly, a balloon, and a locking assembly; the internal catheter assembly passes through the external catheter assembly; the distal end of the balloon is connected to the distal end of the internal catheter assembly, and the proximal end of the balloon is connected to the distal end of the external catheter assembly; the balloon, the external catheter assembly, and the internal catheter assembly form an inflation cavity. The inner catheter assembly is axially movable along the outer catheter assembly to stretch or release the balloon; the locking assembly is disposed between the outer catheter assembly and the inner catheter assembly, and includes a locking head and a locking mechanism; the locking head is disposed at the proximal end of the inner catheter assembly, and the locking head has a locking groove or a locking protrusion; the locking mechanism includes a locking body, an elastic element, and a locking ring, the locking body is disposed at the proximal end of the outer catheter assembly, the elastic element is disposed within the locking body, and the elastic element is used to adapt and engage with the locking groove or the locking protrusion; the locking ring is movably disposed at the proximal end of the locking body, and the locking ring is used to compress the elastic element so that the elastic element can disengage from the locking groove or the locking protrusion; The distal end of the locking ring contacts the elastic element; the elastic element includes a mounting portion and a locking portion, the mounting portion is disposed on the lock body, one end of the locking portion is connected to the mounting portion, and the other end of the locking portion is used to engage with the locking groove or the locking protrusion; the other end of the locking portion extends toward the inner catheter assembly and bends or folds toward the distal end of the inner catheter assembly; when the inner catheter assembly moves distally along the axial direction of the outer catheter assembly to stretch the balloon to a predetermined stretching degree, the locking portion partially falls into the locking groove, so that the locking head contacts the locking mechanism and automatically locks itself to the locking mechanism, thereby automatically locking the inner catheter assembly to the outer catheter assembly, and keeping the balloon at the predetermined stretching degree; When the locking ring compresses the locking portion of the elastic element, the locking portion disengages from the locking groove or the locking protrusion to unlock the inner catheter assembly and release the balloon.

2. The balloon catheter assembly according to claim 1, characterized in that, A push plate is provided at the near end of the lock ring, and the push plate is spaced apart from the lock body.

3. The balloon catheter assembly according to claim 1, characterized in that, The inner wall of the lock body is provided with a sliding groove, and the outer wall of the lock ring is provided with a limiting protrusion, the limiting protrusion being at least partially located within the sliding groove.

4. The balloon catheter assembly according to any one of claims 1-3, characterized in that, The internal catheter assembly includes an internal catheter and a lens assembly; the internal catheter is centrally located and passes through the external catheter assembly, the internal catheter has an internal catheter lumen, the distal end of the internal catheter is sealed and connected to the distal end of the balloon, and the lens assembly is disposed at the distal end of the internal catheter.

5. The balloon catheter assembly according to claim 4, characterized in that, The inner conduit assembly further includes a damping assembly; the damping assembly includes a damping element and an end cap; the end cap is disposed at the proximal end of the inner conduit, the end cap passes through and communicates with the inner conduit, and the damping element is disposed inside the end cap.

6. The balloon catheter assembly according to claim 4, characterized in that, The external catheter assembly includes a connector, an external catheter, and a seal; the connector is centrally located and its distal end is sealed to the proximal end of the external catheter, and it has an inflation port; the external catheter is centrally located and communicates with the connector, and its distal end is sealed to the proximal end of the balloon; the seal is installed in the inner cavity of the connector to seal the gap between the connector and the internal catheter.

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