CN107596539B - Balloon dilatation catheter - Google Patents

Abstract

The invention discloses an expansion balloon catheter. The expansion balloon comprises a guide wire penetrated inside the catheter, one end of the catheter is fixedly connected with an operation part, and a balloon is located outside the distal end of the catheter away from the operation part. The body and the inner cavity of the balloon are connected by a communication structure arranged on the catheter, the guide wire includes a first guide wire and a second guide wire separated from each other, and the rear end of the first guide wire is connected to the plug-in structure at the rear end of the operation part, The second guide wire is fixed inside the catheter through a fixing process. The guide wire cavity and the liquid injection cavity of the present invention can share the same catheter cavity, which greatly reduces the diameter of the catheter of the present invention, so that the dilatation balloon catheter of the present invention can be inserted into the human body through the instrument channel of the endoscope. The dilated narrow tube body or cavity can realize visual operation, which has good practical value.

Description

A dilatation balloon catheter

technical field

The invention relates to the field of medical devices, in particular to an expansion balloon catheter.

Background technique

Existing art dilation balloon catheters, such as the utility model with application number CN201520474689.1, relates to an occluder for lithotripsy, the occluder includes a one-way valve switch, a catheter, a handle, a occlusion ball Balloon, protective film, metal guide wire, small hole; the blocking balloon is wrapped on the outer surface of the catheter, forming a closed cavity with the catheter, the diameter of the cavity is 5-25mm; the blocking balloon is oval shape or spherical shape, the length is 0.5-5cm; the catheter wrapped with the blocking balloon is provided with a small hole; the distal end of the catheter is fixedly connected with a metal guide wire; the metal guide wire is protected by a protective film The proximal end of the catheter is fixedly connected to the handle; the handle is provided with stripes; the one-way valve switch is connected to the proximal end of the catheter; the one-way valve switch is provided with a valve plate; the one-way valve switch is provided with a valve plate; The valve switch connects to the syringe or inflation valve. In the occluder of the utility model for lithotripsy, the catheter wrapped with the blocking balloon is provided with a small hole, the blocking balloon and the inner cavity of the catheter are communicated with each other through the small hole, and the liquid can be injected into the inner cavity of the catheter Then enter the occlusion balloon to expand the balloon. However, when the occlusion balloon of the utility model expands and expands longitudinally by water injection, the catheter also becomes longitudinally stretched and deformed. Due to the different materials of the two, the deformation of the catheter will The water-filled balloon is bent and deformed, which will cause uneven spreading force on the surface of the balloon when it is swollen, increase the difficulty of surgery, reduce the effect of surgical treatment, and easily cause device damage.

The invention with application number CN201510809012.3 provides a device for moving and blocking ureteral calculi, which is composed of a catheter (1), an expandable and compressed balloon (2) and a valve (3), and the catheter (1) is an elastic hollow long The tubular structure is made of elastic silicone or latex material, the front end of the catheter (1) is provided with an opening, the opening is located in the balloon of the expandable and compressed airbag (2); the expandable and compressed airbag (2) is arranged on the catheter (1) ), the expansion state is ellipsoid; the valve (3) is located at the end of the catheter (1), and a syringe inlet (4) is arranged on it. The front section of the catheter (1) of the device can enter the ureter through the operating cavity, so that the balloon (2) is relatively fixed in the upstream ureteral cavity of the calculus or at the outlet of the renal pelvis, so as to block the filling, expanding and destroying effect of the injected water flow on the kidney, and at the same time completely The pathway through which any stones might migrate or escape into the renal pelvis is blocked. The front end of the catheter (1) of the invention is provided with an opening, and the opening is located in the balloon of the expandable and compressed balloon (2); The wire cannot be set at the front end of the compression balloon, so that the guide wire cannot play a role of safety guidance and marking, which may easily cause ureteral injury and reduce the success rate of the operation.

The utility model with the application number CN201120001866.6 discloses a ureteral catheter with a balloon, comprising: a tube body and a balloon, wherein: the balloon is located outside the tube body; A through hole is arranged in the area of the tube; a baffle plate is arranged in the tube body, and the baffle plate divides the space in the tube body into two independent cavities, namely a water injection cavity and a guide wire cavity, wherein the water injection cavity is communicated with the through hole, One end is provided with an opening, the other end is closed, and both ends of the guide wire cavity are transparent. The utility model divides the space in the tube into two independent cavities through the baffle, which are the water injection cavity and the guide wire cavity respectively. Since the baffle is arranged parallel to the axial direction of the ureteral catheter, the two independent cavities are The required diameter space will increase the diameter of the catheter, thereby making the diameter of the catheter thicker, which is not conducive to the catheter extending into the human body from the instrument channel, and further increases the pain of the patient.

The above-mentioned expansion balloon catheter of the prior art cannot be inserted into the instrument pipeline of the endoscope due to the limitation of the diameter, and it is also easy to cause discomfort to the patient during the treatment process, which increases the difficulty of the operation. , it is easy to bend and deform, thereby reducing the effect of surgical treatment and easily causing equipment damage.

SUMMARY OF THE INVENTION

The invention discloses an expanding balloon catheter, comprising a catheter and a guide wire penetrated inside the catheter, one end of the catheter is fixedly connected with an operation part, the outer side of the distal end of the catheter away from the operation part is covered with a balloon, and the catheter cavity is It is communicated with the inner cavity of the balloon by a communication structure arranged on the catheter, the guide wire includes a first guide wire and a second guide wire separated from each other in the inner cavity of the balloon, and the rear end of the first guide wire is connected to the operation part. In the plug-in structure, the second guide wire is fixed to the other end of the catheter through a fixing process.

Preferably, the tube body region of the catheter in the balloon is separated from each other into a first tube body and a second tube body, the rear end of the first tube body is fixedly connected to the operating portion, and the outer wall of the second tube body is fixedly connected to the balloon, The cross-section between the first tube body and the second tube body relatively forms a communication channel, the communication channel is used as a communication structure to connect the catheter cavity and the balloon cavity, and the insertion depth of the second guide wire into the first tube body is greater than The separation distance between the first tubular body and the second tubular body when the balloon 4 is inflated.

Further, the tube wall of the catheter in the balloon is provided with one or more through holes, the through holes are used as a communication structure to communicate the catheter cavity and the balloon lumen, and the through holes 14 are arranged in the second guide wire inserted into the first tube. Between the end in the body and the junction of the first tubular body and the balloon.

Preferably, a developing ring is provided at the connection between the front end of the balloon and the second tube body, and the interior of the catheter in the region of the developing ring is closed.

Preferably, a tip catheter is provided on the side of the catheter away from the operation part, the second guide wire extends into the tip catheter, and the distance between the end of the second guide wire in the tip catheter and the tip of the tip catheter is 0.5mm-2mm.

Preferably, a tip catheter is provided on the side of the catheter away from the operation part, the second guide wire extends away from the operation part to the outside of the tip catheter, and the part of the second guide wire located outside the tip catheter is configured as a spherical body structure.

Preferably, the operating portion includes a hand-held portion, and the catheter is penetrated inside the hand-held portion to form a liquid channel communicating with the inner cavity of the balloon.

Further, the rear end of the hand-held part is provided with a two-way cock, the plug of the two-way cock is provided with a cock through hole, when the cock through hole is coaxial with the nozzle of the conduit, the liquid channel is opened; When the nozzle is vertical, close the liquid channel.

Preferably, a scale line is provided on the outer peripheral surface of the catheter at the rear end of the balloon.

Further, the rear end of the operating part is provided with an external thread, the external thread can be sleeved with a screw cap, the screw cap is connected with the rear end of the first guide wire as a plug-in structure, and the first guide wire can be pulled out by removing the screw cap. .

To sum up, the dilatation balloon catheter of the present invention includes a first guide wire and a second guide wire that are separated from each other. The same catheter cavity can be shared, and there is no need to set up an additional injection cavity, or there is no need to set an additional protective film on the surface of the guide wire to protect the guide wire, which greatly reduces the diameter of the dilation balloon catheter of this embodiment, so that the The expansion balloon catheter of the present invention can be inserted into a narrow tube body or a cavity that needs to be expanded in the human body through the instrument channel of the endoscope, so as to realize visual operation, and has good practical value.

It can be used to dilate the narrowing of the human lumen of the urinary system (ureter), digestive system (bile duct, pancreatic duct), respiratory system (airway).

In order to make the above-mentioned content of the present invention more obvious and easy to understand, preferred embodiments are hereinafter described in detail with reference to the accompanying drawings.

Description of drawings

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a partial structure of an expansion balloon catheter in an embodiment of the present invention;

Fig. 2 is another partial structural schematic diagram of the dilation balloon catheter in the embodiment of the present invention;

FIG. 3 is a schematic diagram of the overall structure of the dilation balloon catheter in the embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure invention, and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the invention. In the drawings, the same elements/elements are given the same reference numerals.

Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal meanings.

first embodiment

As shown in FIG. 1 , the first embodiment of the present invention discloses a dilatation balloon catheter, which includes a guide wire 2 passing through the catheter 1 and the interior of the catheter 1. An operation part 3 is fixedly connected to one end of the catheter 1, and an operation part 3 is fixedly connected to one end of the catheter 1. 3. There is a balloon 4 on the outer side of the distal end of the catheter 1, and the cavity of the catheter 1 and the inner cavity of the balloon 4 are communicated by a communication structure arranged on the catheter 1, wherein the guide wire 2 includes separate first parts. A guide wire 21 and a second guide wire 22, the rear end of the first guide wire 21 is pluggably connected to the operating part 3 through a plug-in structure, and the second guide wire 22 is fixed to the other end of the catheter 1 through a fixing process.

The guide wire 2 includes a first guide wire 21 and a second guide wire 22 that are separated from each other. The first guide wire 21 can be inserted and withdrawn through the insertion and extraction structure provided on the operation part 3. When the dilation balloon catheter is inserted into the human body, the first guide wire 21 The wire 21 can be inserted into the catheter cavity through the insertion and extraction structure provided on the operation part 3. The catheter cavity is used as a guide wire cavity to pass a guide wire, and the guide wire is used to guide and insert, and the first guide wire 21 can be pulled out during liquid injection. The catheter cavity is used as a liquid injection cavity to inject liquid, so that the guide wire cavity and the liquid injection cavity can share the same catheter cavity. The guide wire is protected, so that the diameter of the dilation balloon catheter of this embodiment is greatly reduced, so that the dilation balloon catheter of this embodiment can be inserted into the stenosis that needs to be expanded in the human body through the instrument channel of the endoscope The tube body or cavity is inside the human body to realize visual operation.

Wherein, the liquid injected into the balloon is preferably physiological saline. When the physiological saline is injected into the catheter, the physiological saline enters from the rear end of the catheter 1. Because the front end of the catheter 1 is a closed structure, the physiological saline flows out from the communication structure provided on the catheter and flows out. It is accumulated in the balloon 4, so that the balloon 4 expands outward, and when the physiological saline is withdrawn from the inside of the catheter, the balloon 4 contracts back to the original state.

The interior of the catheter 1 is a hollow structure, the front end of the catheter 1 is a closed structure, the rear end of the catheter 1 is an open structure, a guide wire 2 is penetrated inside the catheter 1, and the cavity of the catheter 1 and the inner cavity of the balloon 4 are arranged in the The communication structures on the conduit 1 communicate with each other.

Specifically, as shown in FIG. 1 , in this embodiment, the catheter 1 is separated into a first tube body 11 and a second tube body 12 in the tube body region of the balloon 4 , and the rear end of the first tube body 11 is fixed Connected to the operation part 3, the outer wall of the second tube body 12 is fixedly connected to the balloon 4, the cross-section between the first tube body 11 and the second tube body 12 relatively constitutes a communication channel 13, and the communication channel 13 serves as a communication structure to connect the catheter 1. The cavity is communicated with the inner cavity of the balloon 4 .

As shown in FIG. 1 , the rear end of the second guide wire 22 extends along the axis of the catheter 1 and is inserted into the inside of the first tube body 11 , and the insertion depth of the second guide wire 22 into the first tube body 11 is greater than that in the balloon 4. The separation distance between the first tube body 11 and the second tube body 12 during expansion. When the second tube body 12 is displaced longitudinally forward, the second guide wire 22 is displaced longitudinally forward along with it, and the first tube At this time, the body 11 is displaced relatively backward along the axis of the catheter 1, since the second guide wire 22 extends from the inside of the second tube body 12 to the inside of the first tube body 11, and the second guide wire 22 is inserted into the first tube body 11 The insertion depth is greater than the separation distance between the first tube body 11 and the second tube body 12 when the balloon 4 is inflated, which can ensure that the catheter as a whole will not be bent and deformed at the cross-section of the catheter, which plays a good role in connection and guidance. effect.

In this embodiment, since the catheter 1 is divided into two sections in the area in which the balloon 4 is placed, during the operation, during the injection, the balloon 4 expands outward and extends longitudinally, and the second tube body 12 can also follow Longitudinal forward displacement, so that the balloon 4 will not be bent due to the pulling and deformation of the catheter. After the balloon 4 is inserted into a narrow tube body or cavity such as the ureter in the human body, it can be expanded evenly, so that the narrow tube can be expanded evenly. The side walls of the body or the cavity are uniformly stressed. The separation design of the two sections of the catheter avoids that the catheter 1 in the prior art is integrated as a whole. When the balloon 4 is inflated and elongated longitudinally, the catheter 1 becomes longitudinally stretched and deformed. Due to the different materials of the catheter 1 and the balloon 4, the catheter 1 The deformation of the inflated balloon will cause the inflated balloon to bend and deform, resulting in uneven spreading force on the surface of the balloon 4 when it is inflated, so that the narrow tube body or the side walls of the cavity that need to be expanded in the human body are unevenly stressed, resulting in the effect of diagnosis and treatment. Not good, causing more discomfort to the patient.

The second guide wire 22 is inserted into the first tube body 11 , and the insertion depth of the second guide wire 22 into the first tube body 11 is greater than that between the first tube body 11 and the second tube body 12 when the balloon 4 is inflated separation distance. It can be ensured that when the balloon 4 is inflated, the second guide wire 22 will not come out from the first tube body 11, so that the first tube body 11 and the second tube body 12 are basically kept in the catheter 1 when they are separated. On the axis, it is further ensured that the balloon 4 will not be bent and deformed when inflated, so that the narrow tube body or each side wall of the cavity to be expanded is more uniformly stressed, and the effect of diagnosis and treatment is greatly improved.

The communication channel 13 can be used as a communication structure to connect the cavity of the catheter 1 and the inner cavity of the balloon 4, so that the guide wire cavity and the liquid injection cavity can share the same catheter cavity, which greatly reduces the expansion balloon of this embodiment. the diameter of the catheter, so that the dilatation balloon catheter of this embodiment can be inserted into the narrow tube body or cavity that needs to be expanded in the human body through the instrument channel of the endoscope, so as to realize the visual operation; it can also prevent the balloon 4 from bending when the liquid is inflated. Deformation, has a good therapeutic effect.

The tube wall of the first tube body 11 in the balloon 4 is further provided with one or more through holes 14 , and the through holes 14 serve as a communication structure to communicate with the cavity of the first tube body 11 and the inner cavity of the balloon 4 . The through hole 14 is arranged between the end of the second guide wire 22 inserted into the first tube body 11 and the connection between the first tube body 11 and the balloon 4 , that is to say, the through hole 14 is arranged at the insertion point of the second guide wire 22 . The side of the end portion in the first tube body 11 that is close to the operation portion 3 .

In addition, the through hole 14 can be used as a communication structure to connect the cavity of the catheter 1 and the balloon 4, so that the guide wire cavity and the liquid injection cavity can share the same catheter cavity, which greatly reduces the dilation balloon catheter of this embodiment. diameter of. In addition, when the first guide wire 21 is pulled out of the first tube body 11 through the plug-in structure connected to the operation part 3 and then injected with liquid, neither the first guide wire 21 nor the second guide wire 22 will block the through hole 14 , which can greatly speed up the expansion of the injection liquid.

Preferably, as shown in FIG. 1 , a developing ring 5 is provided at the connection between the front end of the balloon 4 and the second tube body 12 . In the event that the instrument channel of the endoscope cannot be used, in order to The exact position of the movement inside the body or cavity of the human body can be determined by using the developing ring to determine the position of the balloon 4 in the body or cavity of the body through X-ray imaging technology, so as to monitor the position inside the body or cavity of the human body , to achieve the purpose of diagnosis and treatment.

Similarly, those skilled in the art can also provide a second imaging ring (not shown) at the connection between the rear end of the balloon 4 and the catheter 1 as required, and the setting of the two imaging rings can be recorded by X-ray angiography The technology can more clearly determine the position of the balloon 4 in the tube or cavity of the human body.

Further, the second guide wire 22 is fixedly connected to the inner side of the developing ring 5 through a fixing process. The fixing process includes glue fixing or hot-melting fixing, and other fixing structures or fixing components can also be used to fix the connection between the two. .

Further, the interior of the catheter in the area covered by the developing ring 5 is closed, so that the injected liquid cannot enter the front of the developing ring, but can only stay inside the balloon behind the developing ring 5, which speeds up the injection speed and further shortens the time. time of surgery.

In this embodiment, the material of the catheter between the developing ring 5 and the operating part 3 can usually be PEEK, but also nylon, polyenamine and other materials, preferably PEEK material; PEEK material has the advantages of small diameter and good rigidity, so that The size of the catheter behind the developing ring can reach 0.6-1.5 mm, preferably 0.7-1.0 mm, and optimally 0.8 mm; the Shore hardness of the catheter can reach 50D-95D; preferably 80D-90D. The use of PEEK material can further reduce the diameter of the catheter while ensuring the guiding function of the catheter, thereby improving the diagnosis and treatment effect and reducing the pain of the patient.

Preferably, as shown in FIG. 1 , a tip catheter 23 can be provided on the side of the catheter 1 away from the operation part 3 , the second guide wire 22 extends into the tip catheter 23 , and the front end of the tip catheter 23 exceeds the top of the second guide wire 22 by about 0.5mm-2mm, that is, the distance from the end of the second guide wire 22 in the tip catheter 23 to the top of the tip catheter 23 at the front end of the developing ring is 0.5mm-2mm. In the embodiment of the present invention, the material of the tip catheter 23 is Soft polymer material, preferably TPU. The tip catheter 23 is made of soft material, which can avoid the damage to the inner wall of the ureter caused by the insertion of the hard material, and improve the probability of successful operation. The guide catheter is inserted into the body. Wherein, the length of the front end of the tip catheter 23 beyond the top of the guide wire is 0.5mm-2mm. If the length is less than 0.5mm, the second guide wire 22 will easily puncture the top of the catheter during the insertion process. If the length is greater than 2mm, the front end of the catheter will be too Too soft to be inserted, so a length of 0.5mm-2mm is a suitable range.

Further, the end of the above-mentioned tip catheter 23 can also be set as a spherical body structure, and the smooth spherical surface design of the spherical body structure can guide the catheter insertion into the human body.

As shown in FIG. 1 , in the first embodiment of the present invention, a scale line is also provided on the outer peripheral surface of the catheter 1 at the rear end of the balloon 4 . The insertion depth of the balloon 4 is observed, and the position of the balloon is conventionally determined by X-rays to determine the position of the imaging ring. Therefore, in the embodiment of the present invention, only one developing ring 5 may be provided as a backup. Usually, the endoscope is used to develop and scale to determine the position. Only when the scale line is unclear, the developing ring 5 can be used to assist X-rays. Determine the exact location for catheter insertion.

Preferably, the outer wall of the catheter 1 in front of the operation part 3 is provided with a scale mark, such as 60cm, 80cm and 100cm as shown in Figure 1, for marking the distance at which the catheter enters the internal cavity of the human body, the operator can intuitively pass the scale mark. Observe the length of catheter insertion.

Preferably, the guide wire 2 in this embodiment is a metal guide wire, and the metal guide wire can be made of metal materials such as nickel-titanium alloy or stainless steel, more preferably nickel-titanium alloy. Nitinol is a shape memory alloy, which is a special alloy that can automatically restore its own plastic deformation to its original shape at a certain temperature. Its expansion rate is more than 20%, its fatigue life is up to the 7th power of 1*10, its damping characteristics are 10 times higher than that of ordinary springs, and its corrosion resistance is better than the current best medical stainless steel, so it can meet various engineering and It is a very excellent functional material for medical application requirements. In addition to its unique shape memory function, memory alloys also have excellent characteristics such as wear resistance, corrosion resistance, high damping and superelasticity. Using nickel-titanium alloy as a metal guide wire can greatly prolong the service life of the instrument and reduce the loss rate of the instrument.

As shown in FIG. 3 , the operating portion 3 of the balloon dilation catheter in this embodiment includes a handle portion 31 , and the catheter is penetrated inside the handle portion 31 to form an injection liquid channel communicating with the inner cavity of the balloon 4 . The design of the handle portion 31 is convenient for the operator to hold and operate. Further, it can be seen from FIG. 1 that the hand-held portion 31 is a conical body structure, that is, as shown in the figure, the hand-held portion 31 is a shape body whose diameter gradually decreases gradually from the rear end to the front end. The design of the conical body structure is The ergonomic design makes it more convenient and comfortable for the operator to hold the dilation balloon catheter for operation. Those skilled in the art can think that the shape of the hand-held portion 31 is not limited to the cone shape listed in this embodiment, and can also be designed for other shapes that are convenient for hand-held operation.

Preferably, a two-way cock 32 is provided at the rear end of the hand-held portion 31, and the plug of the two-way cock 32 is provided with a cock through hole, and the plug of the two-way cock is rotated. When the cock through hole is coaxial with the nozzle of the catheter 1 , the liquid channel can be opened; when the through hole of the cock is perpendicular to the orifice of the conduit 1, the liquid channel can be closed. As shown in FIG. 1 , the two-way cock 32 is fixed to the rear end of the hand-held part through a nut, and the injection device is connected to the two-way cock 32. When the two-way cock is rotated to open the liquid channel, the injection device can be connected to the lumen. The liquid is injected into the body. In practice, the injection device can be used with an injection pump of 20 atmospheres; when the two-way cock is rotated to close the liquid channel, on the one hand, it can prevent external pollutants, dust, etc. from entering the ureter through the catheter 1, causing the inner wall of the ureter. Infection, on the other hand, the inflation pressure can be maintained to prevent the fluid in the balloon 4 from flowing out, so that the occlusion balloon 4 is dimensionally stable. Compared with the existing injection structure, the design of the two-way cock 32 needs to control the opening or closing of the injection inlet by pushing and pulling the handle or other structures, and the connection between the handle and the catheter is not fixed. When the handle is continuously pushed and pulled, the handle is easily damaged; however, the two-way conduit 32 of the present invention opens and closes the liquid channel by rotating, which has a simple structure, is easy to operate, and prolongs the service life of the instrument.

As shown in FIG. 3 , the ends of the handle portion 31 and the two-way stopcock 32 are standard null interfaces, which can be used for external injection pumps and other injection equipment. The Null interface is highly versatile and can be configured with different appliances.

Further, the rear end of the operation part 3 is also provided with an external thread 33, and the external thread 33 can be sleeved with a screw cap 35, and the screw cap is connected with the rear end of the first guide wire 21 as a plug-in structure, so that during the operation, the operation The user can turn the screw cap 32 to drive the first guide wire 21 to move outward, thereby pulling out the first guide wire; or after inserting the first guide wire, screw the screw cap 35 to fix it on the external thread 33 . Those skilled in the art can expect that the plugging structure of the first guide wire 21 is not limited to the screw cap provided in this embodiment, but also includes other plugging structures that can achieve the same function.

As shown in FIG. 3 , the operating portion 3 further includes a stress diffusing tube 34 . The stress diffusing tube 34 is disposed at the front end of the hand-held portion 31 , and the catheter 1 penetrates inside the stress diffusing tube 34 . Its function is to prevent the catheter 1 from being damaged due to excessive stress at the base, improve the operator's operating feel, and prevent the cost loss caused by the wear and tear of the instrument. The stress diffusing tube is in the shape of a cylinder or a cone with a hollow inside. The outer diameter of the cone gradually decreases from the back to the front. .

Second Embodiment

The second embodiment of the present invention discloses a dilatation balloon catheter, which includes a guide wire 2 passing through the interior of the catheter 1 , one end of the catheter 1 is fixedly connected with an operation part 3 , and a distal end of the catheter 1 away from the operation part 3 has a The balloon 4, the cavity of the catheter 1 and the inner cavity of the balloon 4 are connected by a communication structure arranged on the catheter 1, and the guide wire 2 includes a first guide wire 21 and a second guide wire 22 separated from each other. The first guide wire 21 The rear end is connected to the plug-in structure at the rear end of the operation part 3 , and the second guide wire 22 is fixed inside the catheter 1 through a fixing process.

This embodiment is a modification of the first embodiment. As shown in FIG. 2 , the difference between this embodiment and the first embodiment is that a tip catheter 23 is provided on the side of the catheter 1 away from the operation portion 3 , and the second embodiment is different from the first embodiment. The guide wire 22 extends away from the operating portion 3 to the outside of the tip catheter 23, and the part of the second guide wire 22 that is located outside the tip catheter 23 is configured as a spherical body structure 6, that is, the head of the second guide wire 22 is welded or integrally formed into a spherical body Structure 6, which forms a guide wire with a ball tip.

In this way, the following effects can be achieved: 1. Reduce catheter material and reduce costs; 2. The thinner guide wire can better guide the insertion process; 3. The design of the spherical body structure minimizes the elongated shape Frictional injury to the inner wall of the ureter caused by guidewire insertion. Preferably, the guide wire 2 is a metal guide wire, and the metal guide wire can be made of metal materials such as nickel-titanium alloy or stainless steel, more preferably nickel-titanium alloy. Nitinol is a shape memory alloy, which is a special alloy that can automatically restore its own plastic deformation to its original shape at a certain temperature. Its expansion rate is more than 20%, its fatigue life is up to the 7th power of 1*10, its damping characteristics are 10 times higher than that of ordinary springs, and its corrosion resistance is better than the current best medical stainless steel, so it can meet various engineering and It is a very excellent functional material for medical application requirements. In addition to its unique shape memory function, memory alloys also have excellent characteristics such as wear resistance, corrosion resistance, high damping and superelasticity. Using nickel-titanium alloy as a metal guide wire can greatly prolong the service life of the instrument and reduce the loss rate of the instrument.

To sum up, the dilation balloon catheter involved in the present invention includes a first guide wire and a second guide wire that are separated from each other. The liquid cavity can share the same catheter cavity, and there is no need to set up another liquid injection cavity, or there is no need to set another protective film on the surface of the guide wire to protect the guide wire, which greatly reduces the diameter of the dilation balloon catheter of the present invention, thereby The expansion balloon catheter of the present invention can be inserted into the narrow tube body or cavity that needs to be expanded in the human body through the instrument channel of the endoscope, so as to realize visual operation, and has good practical value.

The dilatation balloon catheter involved in the present invention can be used for the expansion of the urinary system (ureter), the digestive system (bile duct, pancreatic duct), respiratory system (airway), and the narrowing of human lumen, but not limited to this, the dilatation balloon involved in the present invention The balloon catheter can also be used as a occlusion device. For example, the front end of the catheter 1 is inserted through the gap between the ureteral wall and the stone, and when it reaches the upstream of the stone or even the wide renal pelvis cavity, it can also be pulled out from the opening at the rear end of the catheter. A guide wire, the catheter is used as a liquid injection cavity to inject normal saline, so that the balloon 4 entering the upstream of the stone or the renal pelvis is expanded, and the ureteral cavity upstream of the stone is inflated and blocked, so that the downstream stone fragments and flushing liquid cannot enter The renal pelvis cavity to prevent the ureteral calculus from escaping; or after the balloon in the renal pelvis cavity is dilated, the proximal end of the catheter 1 is properly pulled and then blocked the renal pelvis outlet at the ureteropelvic junction, so that any ureteral stones, stone fragments, flushing fluid All of them cannot enter the renal pelvis cavity, and then perform lithotripsy of ureteral stones, such as laser fiber lithotripsy, after the stones are processed, the fluid in the balloon is extracted, and then the catheter is pulled out. In actual operation, the balloon can be expanded multiple times to adjust the size of the balloon, so that the balloon fits better with the inner wall of the ureter, tightly seals the ureteral calculus, prevents the ureteral lithotripsy from escaping, facilitates surgical operation, and improves the success rate of lithotripsy. .

In addition, the above-mentioned embodiments of the present invention merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (9)

1. An expansion balloon catheter comprises a catheter (1) and a guide wire (2) penetrating through the catheter (1), wherein one end of the catheter (1) is fixedly connected with an operation part (3), a balloon (4) is coated on the outer side of the far end of the catheter (1) far away from the operation part (3), the cavity of the catheter (1) is communicated with the inner cavity of the balloon (4) through a communication structure arranged on the catheter (1), the expansion balloon catheter is characterized in that the guide wire (2) comprises a first guide wire (21) and a second guide wire (22) which are separated from each other in the inner cavity of the balloon (4), the rear end of the first guide wire (21) is connected to a plugging structure of the operation part (3), and the second guide wire (22) is fixed to the other end of the catheter (1) through a fixing process;

the catheter (1) is separated into a first catheter body (11) and a second catheter body (12) in the catheter body area in the balloon (4), the rear end of the first catheter body (11) is fixedly connected to the operation portion (3), the outer wall of the second catheter body (12) is fixedly connected to the balloon (4), a communication channel (13) is formed by the sections of the first catheter body (11) and the second catheter body (12) relatively, the communication channel (13) serves as the communication structure to communicate the cavity of the catheter (1) with the inner cavity of the balloon (4), and the insertion depth of the second guide wire (22) inserted into the first catheter body (11) is larger than the separation distance between the first catheter body (11) and the second catheter body (12) when the balloon (4) is expanded.

2. The dilatation balloon catheter according to claim 1, characterized in that one or more through holes (14) are provided on the wall of the first tube (11) in the balloon (4), said through holes (14) being the communicating structure to communicate the first tube (11) cavity and the balloon (4) lumen, said through holes (14) being provided between the end of the second guide wire (22) inserted into the first tube (11) and the junction of the first tube (11) and the balloon (4).

3. The dilatation balloon catheter according to claim 1 characterized in that the connection of the balloon (4) front end with the second tube (12) is provided with a visualization ring (5), the inside of the catheter is closed in the area covered by the visualization ring (5).

4. The dilatation balloon catheter according to claim 1, characterized in that the side of the catheter (1) away from the operation part (3) is provided with a tip catheter (23), the second guide wire (22) extends into the tip catheter (23), and the end of the second guide wire (22) in the tip catheter (23) is at a distance of 0.5mm-2mm from the tip of the tip catheter (23).

5. The dilatation balloon catheter according to claim 1, characterized in that the side of the catheter (1) remote from the operation part (3) is provided with a tip catheter (23), the second guide wire (22) extends outside the tip catheter (23) remote from the operation part (3), and the part of the second guide wire (22) outside the tip catheter (23) is provided with a spheroid structure (6).

6. The dilatation balloon catheter according to claim 1, characterized in that the operating part (3) comprises a hand-held part (31), the catheter (1) is arranged inside the hand-held part (31) in a penetrating way, forming a liquid passage communicated with the inner cavity of the balloon (4).

7. The dilatation balloon catheter according to claim 6 characterized in that the rear end of the hand-held part (31) is provided with a two-way cock (32), the plug of the two-way cock (32) is provided with a cock through hole, when the cock through hole is coaxial with the nozzle of the catheter (1), the liquid channel is opened; when the cock through hole is perpendicular to the nozzle of the conduit (1), the liquid passage is closed.

8. The dilatation balloon catheter according to claim 1 characterized in that the outer circumference of the catheter (1) at the rear end of the balloon (4) is provided with graduation marks.

9. The dilatation balloon catheter according to claim 6, wherein the rear end of the operation part (3) is provided with an external thread (33), the external thread (33) can be sleeved with a screw cap (35), the screw cap (35) is connected with the rear end of the first guide wire (21) as the plugging structure, and the first guide wire (21) can be pulled out by detaching the screw cap (35).

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