Balloon dilatation catheter

Abstract

The embodiment of the present application relates to the field of medical device technology, and discloses a balloon dilatation catheter. The balloon dilatation catheter includes: a tube body, a push rod, and a balloon head. The tube body includes a catheter, and a guide channel is provided in the catheter; the push rod is movably assembled in the guide channel; the two ends of the balloon head are respectively connected to the distal end of the catheter and the distal end of the push rod; the balloon head can be elastically compressed when it abuts against the obstacle surface, and can be reset when the abutment against the obstacle surface is released; the push rod can push the balloon head forward and limit the extension length of the balloon head to a preset safety length range. Its beneficial effect is: it can effectively prevent the distal end of the balloon dilatation catheter from puncturing or scratching the patient's brain tissue, making the surgical operation process safe.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a balloon dilatation catheter. Background Art

[0002] Obstructive hydrocephalus is a common neurosurgical disease in clinical practice. It is caused by obstruction of the cerebrospinal fluid circulation pathway, which prevents cerebrospinal fluid from entering the cerebellomedullary cisterna or subarachnoid space. The main manifestations are intellectual disability, dizziness and vomiting, decreased vision, headache, and lower limb weakness. It may be followed by brain atrophy, which seriously threatens the patient's life and health. In the past, the surgical treatment of hydrocephalus was mainly shunt surgery, among which ventriculoperitoneal shunt is suitable for communicating and non-communicating hydrocephalus. The surgical effect is definite, which can effectively release cerebrospinal fluid, relieve intracranial pressure, and help improve clinical symptoms. However, the limitations of ventriculoperitoneal shunt are that there are many postoperative complications, easy recurrence, low patient tolerance, and because the shunt tube can be touched subcutaneously, it may cause psychological problems in some young patients, which is not conducive to improving the prognosis.

[0003] As endoscopic technology continues to mature, ventriculoscopy is increasingly being used in neurosurgery, and its effectiveness has been clinically recognized. Ventriculoscopy-assisted third ventriculostomy is a minimally invasive procedure that is simple, requires a small incision, and causes minimal damage to the patient. It also requires no implants, has minimal impact on surrounding organs, and facilitates postoperative recovery.

[0004] Complications of third ventriculostomy surgery primarily include intraoperative venous bleeding, basilar artery rupture, postoperative intracranial hemorrhage, and infection. Currently used balloon dilatation catheters lack a buffer structure at the distal end used to enter tissue, increasing the risk of brain tissue scratches during surgery. This hinders the physician's ability to safely perform the procedure, leading to a series of surgical complications, hindering recovery, and reducing patients' quality of life. Summary of the Invention

[0005] Based on this, in response to the above problems, the present invention proposes a balloon dilatation catheter to solve at least some of the problems existing in traditional balloon dilatation catheters.

[0006] In order to solve the above technical problems, the technical solutions adopted in the implementation of this application are:

[0007] A balloon dilatation catheter comprises: a tube body, the tube body including a catheter, a guide channel being provided in the catheter; a push rod, the push rod being movably assembled in the guide channel; a balloon head, the two ends of which are respectively connected to the distal end of the catheter and the distal end of the push rod; the balloon head can be elastically compressed when it abuts against an obstacle surface, and can be reset when the abutment against the obstacle surface is released; the push rod can push the balloon head forward and limit the extended length of the balloon head to within a preset safety length range.

[0008] In some embodiments, the balloon head includes a probe, a balloon, and an elastic element; wherein, the probe is fixed to the distal end of the push rod; the distal end of the balloon is sealed and sleeved on the probe, and the proximal end of the balloon is sealed and sleeved on the distal end of the catheter, forming an expansion cavity; the elastic element can be compressed, located in the expansion cavity and sleeved on the push rod, connecting the probe and the catheter respectively.

[0009] In some embodiments, the catheter is further provided with an injection channel and an injection port and a discharge port communicated with the injection channel; the injection channel is arranged independently of the guide channel, the expansion chamber is communicated with the injection channel and the guide channel at the same time, the injection port is arranged at the proximal end of the catheter, and the discharge port is arranged at the distal end of the catheter.

[0010] In some embodiments, the tube body also includes a tee; the tee is provided with a connecting tube, a conducting tube and an injection tube, wherein the connecting tube and the conducting tube are coaxially arranged, and the tee is sleeved on the proximal end of the catheter with the connecting tube, connected to the guide channel through the conducting tube, and connected to the injection channel through the injection tube.

[0011] In some embodiments, the three-way pipe is also provided with a sealing end cover and a sealing ring; the sealing end cover is detachably assembled on the pipe mouth of the conducting pipe, and the sealing ring is assembled between the pipe mouth of the conducting pipe and the sealing end cover to form a sealed connection between the push rod and the conducting pipe.

[0012] In some embodiments, the balloon head further includes a press buckle, and the balloon head is crimped and fixed to the distal end of the catheter by the press buckle; the head of the probe is conical.

[0013] In some embodiments, the balloon can be expanded to form a shape with a concave middle and swollen sides after being injected with filling liquid. After being filled and expanded, the balloon can completely cover the probe so that the head of the probe does not extend out of the distal end of the balloon.

[0014] In some embodiments, the proximal end of the push rod is configured as an indicator rod marked with scale values, and the push rod can indicate the compressed length and the extended length of the balloon head through the scale values.

[0015] In some embodiments, a limiting member is further included. The limiting member is sleeved on the indicator rod and can be fixed at a target position on the indicator rod to limit the forward extension length of the balloon head to within a preset safety length range.

[0016] In some embodiments, a handle is further included, wherein the handle is fixed to the proximal end of the push rod.

[0017] The balloon head of the balloon dilatation catheter provided in the present application is elastically connected to the distal end of the catheter and the distal end of the push rod, forming a soft head end of the balloon dilatation catheter. In addition, the balloon head can be elastically compressed when encountering an obstacle and can be elastically reset when the contact with the obstacle surface is released. This can effectively prevent the distal end of the balloon dilatation catheter from puncturing or scratching the patient's brain tissue, making the operation safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 Schematic diagram of the structure of the balloon dilatation catheter provided in an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the catheter structure provided by an embodiment of the present application;

[0021] Figure 3 is a schematic cross-sectional view of the balloon head provided in an embodiment of the present application;

[0022] Figure 4 This is a diagram of the natural state of the balloon head provided in an embodiment of the present application;

[0023] Figure 5 is a diagram showing the filling state of the balloon tip provided in an embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the structure of the three-way pipe provided in an embodiment of the present application;

[0025] Figure 7 is a cross-sectional schematic diagram of a three-way tube provided in an embodiment of the present application, illustrating the assembly relationship of the three-way tube on a balloon dilatation catheter;

[0026] Figure 8 This is a schematic diagram of the use of the balloon dilatation catheter provided in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 100. Balloon dilatation catheter; 10. Catheter; 11. Guide channel; 111. Proximal end hole; 112. Distal end hole; 12. Injection channel; 121. Injection port; 122. Drain port; 20. Push rod; 21. Indicator rod; 22. Limiter; 23. Handle; 30. Balloon head; 31. Probe; 32. Balloon; 33. Elastic element; 34. Snap fastener; 40. T-tube; 41. Connecting tube; 42. Guide tube; 43. Injection tube; 44. Sealing end cap; 45. Sealing ring; 200. Syringe; 300. Ventriculoscope; 310. Guide channel; A. Ventricle; B. Third ventricle; C. Floor membrane of the third ventricle; D. Basilar artery. DETAILED DESCRIPTION

[0029] The present application is described in detail below with reference to specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope of the present application and its applications.

[0030] It should be noted that, unless otherwise expressly specified or limited, the terms "center," "longitudinal," "lateral," "upper," "lower," "vertical," "horizontal," "inner," "outer," and the like used in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Terms such as "mounted," "connected," "connected," and "fixed" should be understood broadly. For example, they can mean fixed, detachable, or integrally connected; mechanically or electrically connected; directly or indirectly through an intermediary. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more; and "and / or" includes any and all combinations of one or more of the relevant listed items. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] like Figure 1 The balloon dilatation catheter 100 provided in this application includes: a tube body, a push rod 20 and a balloon head 30.

[0032] The tube body includes a catheter 10 , which is provided with a proximal end hole 111 and a distal end hole 112 , and a guide channel 11 communicating with the proximal end hole 111 and the distal end hole 112 .

[0033] The push rod 20 is movably assembled in the guide channel 11 , and the proximal end of the push rod 20 extends out of the proximal end hole 111 , and the distal end of the push rod 20 extends out of the distal end hole 112 .

[0034] The two ends of the balloon head 30 are respectively connected to the distal end of the catheter 10 and the distal end of the push rod 20. In the embodiment of the present application, the two ends of the balloon head 30 are elastically connected to the distal end of the catheter 10 and the distal end of the push rod 20, respectively. When the balloon head 30 abuts against an obstacle surface, it can be elastically compressed. When the abutment with the obstacle surface is released, it can be elastically reset. In addition, the push rod 20 can extend the balloon head 30 under the push of an external force F, and the extension length of the balloon head 30 is limited to a preset length range.

[0035] It should be noted that in the medical industry, the two ends of needle-shaped and tubular medical devices are usually referred to as the proximal end and the distal end, where the proximal end refers to the end close to the operator, and correspondingly, the distal end refers to the other end away from the operator.

[0036] The present application provides a balloon head 30 at the distal end of the balloon dilatation catheter 100, which can be elastically compressed when encountering an obstacle and elastically reset when the contact with the obstacle is released. This can effectively prevent the operator from puncturing or scratching the patient's brain tissue with the distal end of the balloon dilatation catheter 100 during the process of using the balloon dilatation catheter 100 to perform cranial surgery on the patient, thereby ensuring the safety of the operation.

[0037] like Figure 2 The catheter 10 is further provided with an injection channel 12 , which is independent of the guide channel 11 and extends along the length direction of the catheter 10 .

[0038] Specifically, the catheter 10 may be a tubular component with both ends open and a hollow interior. The hollow interior portion of the catheter 10 constitutes a main channel having a radial dimension greater than that of the push rod 20, and this main channel serves as the guide channel 11. At least one secondary channel may be defined along the wall of the catheter 10 from the proximal end toward the distal end, and this secondary channel serves as the injection channel 12.

[0039] Alternatively, in some embodiments, the internal hollow portion of the catheter 10 is provided with a partition extending from the proximal end to the distal end along the length direction of the catheter 10, and the partition divides the internal hollow portion of the catheter 10 into at least two, forming at least two relatively independent channels, wherein the radial dimension of one channel is set to be larger than the radial dimension of the push rod 20, and is used as a guide channel 11, and the other channel is used as an injection channel 12.

[0040] The injection channel 12 is provided with an injection port 121 and a discharge port 122 which are in communication with the injection channel 12. The injection port 121 may be provided on the end surface and / or side wall of the proximal end of the catheter 10 for allowing external filling liquid to be infused into the injection channel 12, and the discharge port 122 may be provided on the end surface and / or side wall of the distal end of the catheter 10 for allowing the filling liquid in the injection channel 12 to be discharged.

[0041] like Figure 3 The balloon head 30 may include a probe 31, a balloon 32, and an elastic element 33. The probe 31 is fixedly connected to the distal end of the push rod 20. The balloon 32 is open at both ends and hollow inside. The distal end of the balloon 32 is sealed and sleeved on the probe 31, and the proximal end of the balloon 32 is sealed and sleeved on the distal end of the catheter 10, thereby forming an expansion cavity that can communicate with the injection channel 12 and the guide channel 11 and can accommodate liquid. The elastic element 33 can be compressed, located in the expansion cavity and sleeved on the push rod 20, with its two ends respectively connected to the proximal end of the probe 31 and the distal end of the catheter 10, so that an elastic connection is formed between the probe 31 and the catheter 10.

[0042] In the embodiment of the present application, the probe 31 can be made of stainless steel. The proximal end of the probe 31 can be fixed to the distal end of the push rod 20 by a suitable connection method such as medical glue or a threaded structure. The distal end of the probe 31 away from the push rod 20 can be designed to be conical, that is, the head of the probe 31 can be designed to be conical. This conical design can not only enhance the smooth flow of the balloon expansion catheter 100 in the puncture channel, but also facilitate the probe 31 to enter the brain for puncture and fistula creation. It should be noted that the proximal end of the probe 31 refers to the end of the probe 31 connected to the distal end of the push rod 20. Accordingly, for the convenience of description in the specification, the other end of the probe 31 away from the push rod 20 is referred to as the distal end of the probe 31.

[0043] The balloon 32 is open at both ends and hollow inside. For ease of description, the end of the balloon 32 near the distal end of the catheter 10 is referred to as the proximal end of the balloon 32, and the end of the balloon 32 near the proximal end of the probe 31 is referred to as the distal end of the balloon 32. Accordingly, the opening at the proximal end of the balloon 32 is referred to as the proximal opening, and the opening at the distal end of the balloon 32 is referred to as the distal opening of the balloon 32. The distal opening of the balloon 32 can be sealed onto the proximal surface of the probe 31 using medical glue. The proximal opening of the balloon 32 can also be sealed onto the distal surface of the catheter 10 using medical glue, thereby forming an expansion chamber at the distal end of the balloon dilation catheter 100 that is simultaneously connected to the injection channel 12 and the guide channel 11.

[0044] The balloon 32 can be made of a medical balloon glue having elastic properties. For example, in some embodiments, the balloon 32 can be made of nylon material or polyethylene terephthalate (PET) material. Figure 4 The elastic deformation of the two sides of the balloon 32 near the two end openings can be designed to be stronger than the elastic deformation of the middle part between the two ends, so that the balloon 32 can be expanded into a Figure 5 The shape shown, which is swollen on both sides and contracted in the middle, such as pear shape, gourd shape or waist shape, ensures that the balloon 32 can completely cover the probe 31 after being filled and expanded, so that the head of the probe 31 does not extend out of the distal end of the balloon 32, preventing the head of the probe 31 from contacting and damaging brain tissue, and has a good protective effect.

[0045] The elastic element 33 can be a spring, which is housed in the expansion cavity, and the two ends of the spring can be respectively bonded and fixed to the probe 31 and the catheter 10 by using medical glue, so that the balloon head 30 is elastically connected to the distal end of the catheter 10, ensuring the softness of the balloon head 30, thereby reducing the stimulation of the brain tissue caused by the distal end of the balloon dilation catheter 100 after entering the skull.

[0046] Please continue reading Figure 3 In order to strengthen the connection between the balloon head 30 and the catheter 10, the balloon 32 can be further crimped and fixed to the distal end of the catheter 10 by using a press buckle 34, in addition to being fixed to the distal end of the catheter 10 by glue, to prevent the balloon head 30 from accidentally falling off the catheter 10 during the surgical operation. Specifically, the press buckle 34 can be made of metal and can be formed into a sheet or a wire. The outer diameter of the distal end of the catheter 10 can be set to be smaller than the outer diameter of the rest of the catheter 10 to form an adhesive surface at the distal end of the catheter 10 for the balloon 32 to be bonded. After the proximal end of the balloon 32 is bonded and fixed to the adhesive surface, the balloon 32 can be crimped and fixed by using a sheet-shaped press buckle 34 to surround the adhesive surface or using a wire-shaped press buckle 34 to wrap around the adhesive surface, so that the balloon head 30 is further fixed to the distal end of the catheter 10, greatly reducing the possibility of the balloon head 30 becoming loose.

[0047] like Figure 6The tube body further includes a tee 40, which is provided with a connecting tube 41, a conducting tube 42, and an injection tube 43. In the tee 40, the connecting tube 41 and the conducting tube 42 are coaxially arranged, and the injection tube 43 is non-coaxially arranged with the connecting tube 41 and / or the conducting tube 42. The tee 40 is sleeved on the proximal end of the catheter 10 through the connecting tube 41, and is connected to the guide channel 11 through the conducting tube 42, and is connected to the injection channel 12 through the injection tube 43. In addition, to prevent the filling liquid from leaking from the connection, a suitable sealing structure can be used at the connection between the connecting tube 41 and the catheter 10 and at the connection between the conducting tube 42 and the push rod 20 to ensure a good sealing effect.

[0048] like Figure 7 In the embodiment of the present application, the orifice of the conducting tube 42 is detachably mounted with a sealing end cap 44 and a sealing ring 45. The sealing end cap 44 defines a conducting port that communicates with the conducting tube 42 and is detachably mounted on the orifice of the conducting tube 42. The sealing ring 45 is mounted between the orifice of the conducting tube 42 and the sealing end cap 44. In actual use, the push rod 20 passes through the conducting port of the sealing end cap 44 and forms a sealed connection with the orifice of the conducting tube 42 via the sealing ring 45, thereby forming a sealed connection between the push rod 20 and the conducting tube 42.

[0049] In some embodiments, the sealing end cover 44 can be replaced by other suitable structures to achieve a sealed connection effect between the push rod 20 and the conducting tube 42. For example, an annular rim (not shown in the figure) can be provided at the edge of the tube mouth of the conducting tube 42, extending toward the push rod 20 and allowing the push rod 20 to pass through. A sealing groove is provided on the inner wall of the tube mouth of the conducting tube 42, and a sealing ring 45 is assembled in the sealing groove to assist the annular rim in ensuring the sealing effect of the push rod 20 at the tube mouth of the conducting tube 42.

[0050] like Figure 8When using the balloon dilatation catheter 100, the operator connects the syringe 200 to the injection tube 43 of the tee pipe 40 and gradually pushes the piston rod of the syringe 200 to inject the filling liquid in the syringe 200 from the injection tube 43 into the interior of the balloon dilatation catheter 100. After the filling liquid enters the injection tube 43, it flows along the injection channel 12 into the expansion cavity of the balloon head 30. As the filling liquid is continuously injected, it fills the entire expansion cavity and then gradually fills all the space inside the balloon dilatation catheter 100 from the distal end to the proximal end along the guide channel 11. Since the interior of the balloon dilatation catheter 100 is a sealed space, and the elastic deformation on both sides of the balloon 32 is stronger than the elastic deformation in the middle of the balloon 32, when the filling liquid fills the entire internal space of the balloon dilatation catheter 100, the balloon head 30 will expand and form a shape with a concave middle and bulging at both ends under the continued injection of filling liquid. The filled and expanded balloon 32 can completely cover the probe 31, so that the head of the probe 31 does not extend beyond the distal end of the balloon 32, thereby avoiding damage to the internal tissues of the brain.

[0051] See also Figure 1 To facilitate understanding and control of the retractable length of the balloon tip 30 within the human skull during the surgical procedure and ensure a safe and reliable surgical procedure, the proximal end of the push rod 20 can be configured as an indicator rod 21. The surface of the indicator rod 21 can be marked with a scale within a preset range. Preferably, in the embodiment of the present application, the scale range of the indicator rod 21 can be -10mm-20mm. It is understood that those skilled in the art can set the scale range of the indicator rod 21 to other reasonable values ​​based on actual conditions.

[0052] In actual use, when the push rod 20 is not subjected to external force F, the zero mark on the indicator rod 21 is aligned with the edge of the opening of the conducting tube 42. When the balloon head 30 abuts against an obstruction and is compressed, the zero mark on the indicator rod 21 extends beyond the opening. At this time, the mark on the indicator rod 21 where the edge of the opening of the conducting tube 42 is aligned is the compressed length of the balloon head 30. When the push rod 20 is pushed, the push rod 20 drives the balloon head 30 to extend forward to the distal end. After the 0 scale of the indicator rod 21 is extended into the tube mouth, the scale value on the rod body of the indicator rod 21 at which the tube mouth edge of the conducting tube 42 is aligned is the extended length of the balloon head 30 after being stretched from a natural state without being affected by the external force F. During this process, the elastic element 33 is stretched, and the elastic potential energy is accumulated to generate a reset force. When the external force F acting on the push rod 20 is cancelled, the push rod 20 can return to its initial position aligned with the tube mouth edge of the conducting tube 42 at the 0 scale under the reset force of the elastic element 33.

[0053] In this application, the proximal end of the push rod 20 is designed to be an indicator rod 21 with a certain scale range. The operator can easily understand the compressed length and extended length of the balloon head 30 in the human skull through the scale of the indicator rod 21, ensuring that the deformation of the balloon head 30 is within the allowable safety range, thereby ensuring the safety and reliability of the operation.

[0054] See also Figure 1 The push rod 20 may also be provided with a limiter 22 for limiting the extension length of the balloon head 30 within a preset safety range. The limiter 22 may be an annular or regular polygonal component with an assembly hole defined in the center. The limiter 22 is mounted on the indicator rod 21 through the assembly hole and fixed to a target position on the indicator rod 21. The limiter 22 cooperates with the scale marked on the surface of the indicator rod 21 to limit the pushing stroke of the push rod 20, so that the extension length of the balloon head 30 under the action of the push rod 20 is limited to a preset safety range.

[0055] Furthermore, to ensure that the stopper 22 is securely fixed to the indicator rod 21, in some embodiments, the stopper 22 may have a threaded channel extending radially therefrom, communicating with the assembly through-hole. A stud may be mounted within the threaded channel. Once the stopper 22 is positioned over the indicator rod 21 and slid to the desired position, the stud is tightened until the end of the stud moves toward the assembly through-hole and abuts against the surface of the indicator rod 21, thereby securing the stopper 22 to the desired position on the indicator rod 21.

[0056] During the actual use of the balloon dilatation catheter 100, the target forward extension length of the balloon head 30 can be set by moving the limiter 22 along the indicator rod 21 to the target scale and fixing it at the target scale. When the forward extension length of the balloon head 30 needs to be changed, another target forward extension length of the balloon head 30 can be pre-set by sliding the limiter 22 along the indicator rod 21 and fixing it at another target scale.

[0057] When using the balloon dilatation catheter 100, the operator presses the proximal end of the push rod 20 to cause the balloon 32 to extend distally. When the stopper 22 affixed to the push rod 20 abuts the sealing end cap 44 or the annular rim of the guide tube 42, the balloon tip 30 is allowed to extend forward by a predetermined length, while also limiting further extension. When the proximal end of the push rod 20 is released, the elastic element 33 resets, and the balloon tip 30 retracts under the reset force of the elastic element 33. Furthermore, the stopper 22 prevents the balloon tip 30 from puncturing the meninges during compression and causing an instantaneous reset, which could lead to excessive extension and damage to brain tissue such as the basilar artery.

[0058] Please continue reading Figure 1To improve the operator's comfort when using the balloon dilatation catheter 100 and to enhance the convenience and reliability of operation, a handle 23 may be provided at the proximal end of the push rod 20. Specifically, the proximal end of the push rod 20 may be pre-machined with an external thread, and the center of the handle 23 may be pre-machined with an internal thread that matches the external thread. The internal thread of the handle 23 cooperates with the external thread of the push rod 20 to achieve detachable assembly and fixation.

[0059] Those skilled in the art will appreciate that the connection between the handle 23 and the push rod 20 is not limited to the aforementioned threaded connection, and any other suitable connection method may be used to achieve reliable assembly and fixation, as long as it can ensure that there is no relative sliding between the handle 23 and the push rod 20 during use of the balloon dilatation catheter 100. By providing the handle 23 at the proximal end of the push rod 20, the operator can better apply force to the push rod 20, thereby better controlling the extension length of the balloon head 30, thereby facilitating better completion of the surgical operation and reducing operational risks.

[0060] To facilitate a better understanding of the implementation of the balloon dilatation catheter 100, the following schematically illustrates the use process of the balloon dilatation catheter 100 in combination with actual application scenarios.

[0061] See also Figure 8 During the specific operation of the balloon dilatation catheter 100 of this embodiment, the patient takes a supine position after general anesthesia and is accurately positioned by MRI. A straight incision of about 3 cm is made at the center, 1 to 2 cm in front of the coronal suture and 2 to 3 cm to the right of the midline. The skin, subcutaneous tissue and galea aponeurotica are cut in sequence, and the skull is drilled to expand the bone window to 1 cm. The dura mater is electrocoagulated to stop bleeding, the dura mater is cross-cut, and the arachnoid membrane on the surface of the brain is electrocoagulated. Puncture is performed perpendicular to the line connecting the two external auditory canals through a brain needle. After the puncture is completed, the ventriculoscope 300 is placed in the ventriculoscope 300 display screen to observe the frontal angle of the ventricle A in real time, and the side walls of the ventricle A are checked in all directions. The ventricle A is slowly moved forward along the choroid plexus to find the interventricular foramen. The guide tube 10 of the ventriculoscope 300 passes through the interventricular foramen to reach the third ventricle B.

[0062] After reaching the third ventricle B, the ventricle side wall is checked using the ventricle scope 300, and the mammillary bodies are found by reaching the third ventricle floor membrane C in the vertical direction. The balloon dilatation catheter 100 is passed through the guide channel 310 of the ventricle scope 300, and a fistula is punctured and created through the probe 31 of the balloon head 30 in the weak area between the infundibulum recess and the bilateral mammillary bodies. Specifically, the position of the limiter 22 on the indicator rod 21 is adjusted. For example, the limiter 22 is slid to the scale of the indicator rod, and the balloon dilatation catheter 100 is pressed on the third ventricle floor membrane C with the probe 31. When the probe 31 of the balloon dilatation catheter 100 is pressurized, the spring in the balloon head 30 is compressed, and the scale at the rear end of the indicator rod 21 continuously exits the tube mouth of the guide tube 42 to display the degree of compression of the spring in real time. The preferred safety range is not more than -5mm scale. When the spring is further compressed, the probe 31 at the front end of the balloon head 30 punctures the third ventricle floor membrane C under the action of the spring elastic force. The puncture of the third ventricle floor membrane C can be observed through the ventriculoscope 300. If the third ventricle floor membrane C is not punctured, the push rod 20 can be pushed forward to extend the balloon head 30 to puncture the third ventricle floor membrane C again until the third ventricle floor is punctured. The membrane C is punctured to form a fistula opening. During this process, due to the limiting effect of the limiting member 22, the balloon head 30 can be prevented from extending too long during the puncture process and damaging the basilar artery D, causing intracranial hemorrhage. After the fistula opening is formed by puncture, the balloon head 30 of the balloon dilatation catheter 100 is inserted into the fistula opening under the ventriculoscope 300. When the middle part of the balloon 32 of the balloon head 30 is coplanar with the third ventricular floor membrane C at the fistula opening, the syringe 200 pre-connected with the injection tube 43 is pushed, so that the filling liquid in the syringe 200 passes through the injection tube 43 and the injection channel 12 in turn into the expansion cavity of the balloon head 30. As the filling liquid continues to be injected, the filling liquid will fill the entire internal space of the balloon dilatation catheter 10 and make the balloon 32 gradually expand. The expanded balloon 32 will wrap the distal conical part of the probe 31 inside (such as Figure 8 ) to prevent the probe 31 from damaging the basilar artery D. As the syringe 200 continues to push, the balloon 32 expands into a bulging shape, allowing it to become lodged in the stoma, preventing it from accidentally falling out during dilation. Continued injection of filling fluid continues to expand the stoma until the diameter reaches 6-8 mm. After the stoma is created, the syringe 200 is used to reversely aspirate the filling fluid within the balloon dilation catheter 100 to deflate the balloon 32. The balloon dilation catheter 100 and ventriculoscope 300 are then removed, the bone hole is sealed, and the scalp is sutured and the incision bandaged, completing the procedure.

[0063] The balloon head 30 of the balloon dilatation catheter 100 provided in the present application is elastically connected to the distal end of the catheter 10 and the distal end of the push rod 20, forming a soft head end of the balloon dilatation catheter 100, which can avoid accidental injury to blood vessels and nerves during surgery, reduce surgical complications, and make positioning operations safer and more reliable; the proximal end of the push rod 20 is configured as an indicator rod 21 for judging the telescopic length of the balloon head 30, making the compression or extension of the balloon head 30 more intuitive. Specifically, the scale of the push rod 20 makes it more convenient and accurate for the balloon head 30 to puncture tissue, making tissue puncture simpler, intuitive and safer.

[0064] The above content is a further detailed description of the present application in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application.

Claims

1. A balloon dilatation catheter, characterized in that: include: A tube body, the tube body comprising a conduit, wherein a guide channel is provided in the conduit; a push rod movably assembled in the guide channel; A balloon head, two ends of which are respectively connected to the distal end of the catheter and the distal end of the push rod; The balloon head can be elastically compressed when it abuts against an obstacle surface, and can be reset when it is released from abutment against the obstacle surface; The push rod can push the balloon head forward and limit the extended length of the balloon head to within a preset safety length range; The balloon head includes a probe, a balloon and an elastic element; The probe is fixed to the distal end of the push rod; the distal end of the balloon is sealed and sleeved to the probe, and the proximal end of the balloon is sealed and sleeved to the distal end of the catheter to form an expansion cavity; The elastic element can be compressed, is located in the expansion cavity and is sleeved on the push rod, and is respectively connected to the probe and the catheter; The probe is made of stainless steel.

2. The balloon dilatation catheter according to claim 1, wherein The conduit is further provided with an injection channel and an injection port and a discharge port communicating with the injection channel; The injection channel is independently provided from the guide channel, the expansion chamber is communicated with both the injection channel and the guide channel, the injection port is provided at the proximal end of the catheter, and the discharge port is provided at the distal end of the catheter.

3. The balloon dilatation catheter according to claim 2, wherein: The tube body also includes a tee; the tee is provided with a connecting tube, a conducting tube and an injection tube, wherein the connecting tube and the conducting tube are coaxially arranged, the tee is sleeved on the proximal end of the catheter with the connecting tube, is connected to the guide channel through the conducting tube, and is connected to the injection channel through the injection tube.

4. The balloon dilatation catheter according to claim 3, wherein: The three-way pipe is also provided with a sealing end cover and a sealing ring; the sealing end cover is detachably assembled on the pipe mouth of the conducting pipe, and the sealing ring is assembled between the pipe mouth of the conducting pipe and the sealing end cover to form a sealed connection between the push rod and the conducting pipe.

5. The balloon dilatation catheter according to any one of claims 1 to 4, characterized in that: The balloon head also includes a press buckle, through which the balloon head is crimped and fixed to the distal end of the catheter; the head of the probe is conical.

6. The balloon dilatation catheter according to any one of claims 1 to 4, characterized in that: The balloon can be expanded to form a shape with a concave middle and swollen sides after being injected with filling liquid. After being filled and expanded, the balloon can completely cover the probe so that the head of the probe does not extend out of the distal end of the balloon.

7. The balloon dilatation catheter according to any one of claims 1 to 4, characterized in that: The proximal end of the push rod is configured as an indicator rod marked with scale values, and the push rod can indicate the compressed length and the extended length of the balloon head through the scale values.

8. The balloon dilatation catheter according to claim 7, wherein: It also includes a limiting piece, which is sleeved on the indicator rod and can be fixed at a target position on the indicator rod to limit the forward extension length of the balloon head to within a preset safety length range.

9. The balloon dilatation catheter according to any one of claims 1 to 4, characterized in that: The utility model further comprises a handle, wherein the handle is fixed to the proximal end of the push rod.

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