Blood vessel ultrasonic dilation catheter

Abstract

The invention discloses a blood vessel ultrasonic dilation catheter, which belongs to the field of medical instruments and comprises a catheter body and a guide wire. A through hole is formed in the catheter body, and the catheter body movably sleeves the guide wire through the through hole; a cavity is formed in the catheter body, a liquid contrast agent is contained in the cavity, a through hole communicated with the outside is formed in the side wall of the cavity, a liquid supply mechanism for providing high-pressure liquid for the cavity is arranged on the catheter body, and an elastic film is arranged in the through hole; strip-shaped cracks are uniformly formed in the elastic film, the multiple cracks are uniformly and circumferentially distributed on the surface of the elastic film, and extension lines of the multiple cracks intersect at the same point; when the catheter body is bent along with the blood vessel, the through hole in the outer arc face of the bent portion of the catheter body is in a stretched state, the elastic film in the through hole in the outer arc face of the bent portion of the catheter body is stretched, at the moment, part of the cracks in the elastic film are torn open, and therefore the cavity is communicated with the outside of the catheter body through the cracks and the through hole.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a blood vessel ultrasonic dilation catheter. Background Art

[0002] In modern medicine, vascular stenosis or blockage is a common disease that seriously affects the health and quality of life of patients. Traditional vascular dilation methods include balloon dilation and stent implantation, but these methods have some limitations. For example, balloon dilation may cause damage to the vascular endothelium, and restenosis may occur after stent implantation.

[0003] In recent years, ultrasound technology has demonstrated unique advantages in the field of vascular interventional therapy, becoming a new option for vasodilation. As an innovative medical device, the vascular ultrasound dilation catheter works by targeting narrowed or blocked blood vessels with ultrasonic energy, effectively dilating them. Compared to traditional surgery, this technology offers significant advantages: Its minimally invasive approach avoids surgical incisions, significantly reducing the risk of infection. Furthermore, the precise targeting of ultrasonic energy allows it to selectively target lesions, minimizing damage to surrounding healthy tissue.

[0004] Before the operation, contrast agent needs to be injected through the catheter to accurately locate the site of stenosis or blockage of the blood vessel. When injecting contrast agent through the catheter, the catheter is usually movably placed on the outside of the guide wire (that is, the guide wire passes through the inner lumen of the catheter). During the specific operation, the guide wire needs to be placed into the blood vessel first and guided to the target position, and then the catheter is advanced along the guide wire.

[0005] However, during the movement of the catheter, the relative movement between the catheter and the guidewire may rub the vascular endothelium, especially when passing through tortuous blood vessels (such as the left circumflex coronary artery, iliac artery, etc.). The contact area between the catheter and the blood vessel wall increases. When the catheter moves on the surface of the inner wall of the blood vessel, it may cause endothelial denudation or endothelial damage.

[0006] To this end, a vascular ultrasonic dilation catheter is proposed. Summary of the Invention

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide a vascular ultrasonic dilation catheter that can reduce the friction between the catheter body and the inner wall of the blood vessel.

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A vascular ultrasonic dilation catheter, comprising a catheter body and a guide wire; A through hole is provided on the catheter body, and the catheter body is movably sleeved on the guide wire through the through hole; The catheter body is provided with a cavity containing a liquid contrast agent, a through hole communicating with the outside is provided on the side wall of the cavity, the catheter body is provided with a liquid supply mechanism for providing high-pressure liquid to the cavity, and an elastic membrane is provided in the through hole; the elastic membrane is provided with strip-shaped cracks uniformly distributed on the surface of the elastic membrane, and the extension lines of the multiple cracks intersect at the same point; The outer sliding sleeve of the catheter body is provided with a protective sleeve, which is used to prevent the liquid in the cavity from leaking.

[0010] Furthermore, an annular mounting groove is provided on the side wall of the through hole, the elastic membrane is circular, the edge of the elastic membrane is fixedly connected to the side wall of the mounting groove, and the ratio of the mounting groove diameter to the through hole diameter is 2-4.

[0011] Furthermore, the liquid supply mechanism includes a one-way valve fixedly embedded in the side wall of the cavity; an extension tube is inserted on the side wall of the through hole, the extension tube is a hose, the extension tube extends into the cavity, and a water bag is fixedly installed at one end of the extension tube located in the through hole.

[0012] Furthermore, bumps are evenly and fixedly mounted on the side walls of the through hole, and bumps are provided on both sides of the water bag.

[0013] Furthermore, the protrusion is annular.

[0014] Furthermore, a mounting ring is fixedly mounted on the end of the protective sleeve, and the mounting ring is in a circular ring shape.

[0015] Furthermore, the mounting ring is made of stainless steel.

[0016] Furthermore, the protective sleeve is made of elastic material.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) This solution uses the mutual cooperation of the cavity, through-hole, elastic membrane and crack. When the catheter body bends along with the blood vessel, the through-hole located on the outer arc surface of the curved part of the catheter body is in a stretched state, and the elastic membrane located in the through-hole on the outer arc surface of the curved part of the catheter body is stretched. At this time, part of the cracks on the elastic membrane are torn open, so that the cavity is connected to the outside of the catheter body through the cracks and through-hole. Therefore, the high-pressure contrast agent in the space is discharged through the through-hole into the gap between the inner wall of the blood vessel and the outer wall of the catheter body. The liquid contrast agent is injected into the connection between the blood vessel and the catheter body through the through-hole. This can reduce the friction between the catheter body and the blood vessel during the movement of the catheter body, prevent the blood vessel from being damaged by friction, and play a role in protecting the blood vessel and improving safety. In addition, the contrast agent in the cavity will not cause harm to the body, which plays a role in improving safety.

[0018] (2) This solution can block the through-hole outside the body of the catheter by setting a protective sleeve on the outside of the body, thereby preventing the liquid contrast agent in the cavity from being discharged through the through-hole outside the body, thereby ensuring that the cavity can contain a sufficient amount of liquid contrast agent.

[0019] (3) This solution sets strip-shaped cracks on the surface of the elastic membrane in a uniform circumference. Since the bending direction of the catheter body is uncertain, setting cracks in a uniform circumference can ensure that at least one crack will open when the catheter body is bent, thereby ensuring that the contrast agent in the catheter body can flow out normally.

[0020] (4) This solution provides a mounting groove on the side wall of the through hole, and the diameter of the mounting groove is larger than the diameter of the through hole, and the elastic membrane is fixedly installed in the mounting groove. Therefore, when the catheter body is bent, the deformation degree of the mounting groove located on the outer arc surface is greater, thereby increasing the deformation degree of the elastic membrane when the catheter body is bent, thereby ensuring that the crack can be opened.

[0021] (5) In this solution, a circular protrusion is fixedly installed on the side wall of the through hole, so that the water bag can be squeezed when the catheter is bent in any direction, ensuring that the water bag can be squeezed in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a bottom view structural schematic diagram of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the catheter body of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 It is a schematic diagram of the top view of the structure of the present invention; Figure 5 Schematic diagram of the structure of the elastic membrane of the present invention; Figure 6 Schematic diagram of the combined structure of the water bag and the extension tube of the present invention.

[0023] Description of the numbers in the figure: 1. Catheter body; 2. Guidewire; 3. Through hole; 4. Cavity; 5. Through hole; 6. Elastic membrane; 7. Crack; 8. Protective sleeve; 9. Mounting groove; 10. One-way valve; 11. Extension tube; 12. Water bladder; 13. Bump; 14. Mounting ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Example 1: See also Figures 1 to 6 A vascular ultrasonic dilatation catheter comprises a catheter body 1 and a guide wire 2; the catheter body 1 is provided with a through hole 3, and the catheter body 1 is movably sleeved on the guide wire 2 through the through hole 3, that is, the guide wire 2 passes through the through hole 3; The catheter body 1 is provided with a cavity 4, in which a contrast agent is filled. A through hole 5 communicating with the outside world is provided on the side wall of the cavity 4. The catheter body 1 is provided with a liquid supply mechanism for providing high-pressure liquid to the cavity 4. An elastic membrane 6 is provided in the through hole 5. When the catheter body 1 is not deformed, the elastic membrane 6 is not subjected to tension and is in a flat state. Strip-shaped cracks 7 are evenly provided on the elastic membrane 6. The cracks 7 penetrate the elastic membrane 6. Multiple cracks 7 are evenly distributed circumferentially on the surface of the elastic membrane 6, and the extension lines of the multiple cracks 7 intersect at the same point. When the elastic membrane 6 is not deformed by tension, the elastic membrane 6 is in a flat state, and the side walls of the cracks 7 are in contact, thereby isolating the cavity 4 from the outside world and preventing the liquid in the cavity 4 from leaking. The outer sliding sleeve of the catheter body 1 is provided with a protective sleeve 8, which is used to prevent the liquid in the cavity 4 from leaking. By arranging the protective sleeve 8 on the outside of the catheter body 1, the through hole 5 located outside the body can be blocked to prevent the liquid contrast agent in the cavity 4 from being discharged through the through hole 5 located outside the body.

[0026] First, the puncture needle is used to penetrate the artery, and then the guide wire 2 is inserted into the puncture needle so that the guide wire 2 is inserted into the artery. Then the puncture needle is withdrawn and a soft sheath is inserted. The guide wire 2 is then pushed along the artery until the guide wire 2 reaches the vicinity of the site to be expanded. The entire process is completed under the guidance of an X-ray imager.

[0027] Among them, the mutual coordination of the puncture needle, the sheath tube and the guide wire 2 is existing technology and will not be described in detail.

[0028] Then the catheter body 1 sleeved on the guide wire 2 is passed along the guide wire 2 to the end of the guide wire 2 , and then a contrast agent is injected into the end of the through hole 3 located outside the body, so that the location of the stenosis of the blood vessel can be found through imaging.

[0029] Then the guide wire 2 continues to move inward, passes through the stenosis, and then the balloon is inserted. When the balloon moves to the stenosis, the balloon expands, thereby driving the blood vessel to expand through the balloon.

[0030] Among them, balloon dilatation is an existing technology and will not be described in detail.

[0031] During the process of inserting the catheter body 1, when the catheter body 1 bends along with the blood vessel, the through hole 5 located on the outer arc surface of the curved part of the catheter body 1 is in a stretched state, and the elastic membrane 6 located in the through hole 5 on the outer arc surface of the curved part of the catheter body 1 is stretched. At this time, part of the cracks 7 on the elastic membrane 6 are torn open, so that the cavity 4 is connected with the outside of the catheter body 1 through the cracks 7 and the through hole 5, so that the high-pressure contrast agent in the space is discharged through the through hole 5 into the gap between the inner wall of the blood vessel and the outer wall of the catheter body 1.

[0032] For the part where the blood vessel is curved and in contact with the catheter body 1, injecting liquid contrast agent into the connection between the blood vessel and the catheter body 1 through the through hole 5 can reduce the friction between the catheter body 1 and the blood vessel during the movement of the catheter body 1, prevent the blood vessel from being damaged due to friction, and play a role in protecting the blood vessel and improving safety.

[0033] like Figure 3 、 Figure 5 As shown, an annular mounting groove 9 is provided on the side wall of the through hole 5, the elastic membrane 6 is circular, the edge of the elastic membrane 6 is fixedly connected to the side wall of the mounting groove 9, and the ratio of the diameter of the mounting groove 9 to the diameter of the through hole 5 is 2-4.

[0034] Since the crack 7 is opened on the elastic membrane 6 and the diameter of the mounting groove 9 is larger than the diameter of the through hole 5, when the catheter body 1 is bent, the deformation degree of the mounting groove 9 located on the outer arc surface is larger, thereby increasing the deformation degree of the elastic membrane 6 when the catheter body 1 is bent, thereby ensuring that the crack 7 can be opened.

[0035] like Figure 2 As shown, the liquid supply mechanism includes a one-way valve 10 fixedly embedded on the side wall of the cavity 4, and the one-way valve 10 is installed at the part of the catheter body 1 located outside the body. Therefore, when in use, the output end of the container containing the contrast agent is connected to the input end of the one-way valve 10, and then the contrast agent in the container can be injected into the cavity 4; an extension tube 11 is inserted on the side wall of the through hole 3, and the extension tube 11 is a hose. The extension tube 11 extends into the cavity 4, and a water bag 12 is fixedly installed at one end of the extension tube 11 located in the through hole 3. The water bag 12 is a bellows shape, and the water bag 12 is parallel to the catheter body 1. Therefore, in the process of injecting contrast agent into the cavity 4, part of the contrast agent will flow into the water bag 12 and fill the water bag 12, causing the bellows-shaped water bag 12 to stretch. When the bellows-shaped water bag 12 is squeezed, the bellows-shaped water bag 12 contracts and no longer recovers when not subjected to external force.

[0036] When the catheter body 1 bends, the water bag 12 located on the inner wall of the through hole 3 and close to the outer arc surface of the catheter body 1 is squeezed by the curved side wall of the through hole 3. At this time, the contrast agent in the water bag 12 is continuously discharged into the cavity 4 through the extension tube 11, increasing the hydraulic pressure in the cavity 4.

[0037] like Figure 2 As shown, annular protrusions 13 are evenly and fixedly mounted on the side walls of the through hole 3 , and protrusions 13 are provided on both sides of the water bag 12 .

[0038] When the catheter body 1 bends, the inner side wall of the catheter body 1 in the bent state drives the two adjacent protrusions 13 located at this position to approach each other. At this time, the two protrusions 13 approaching each other jointly squeeze the water bag 12 located between the two protrusions 13, thereby ensuring that the contrast agent in the water bag 12 can flow into the cavity 4.

[0039] The annular protrusions 13 are evenly arranged along the extending direction of the through hole 3 , so that the protrusions 13 can squeeze the corresponding water bag 12 when the catheter body 1 is bent in any direction, thereby ensuring that the water bag 12 can be squeezed.

[0040] like Figure 1 、 Figure 2 As shown, a mounting ring 14 is fixedly mounted on the end of the protective sleeve 8, and the mounting ring 14 is in a circular ring shape.

[0041] The hard mounting ring 14 is provided to facilitate gripping by medical personnel, thereby facilitating relative displacement between the catheter body 1 and the protective sleeve 8 .

[0042] The mounting ring 14 is made of stainless steel. The surface of the stainless steel is not easy to breed bacteria, which plays a role in improving safety.

[0043] like Figure 1 As shown, the protective sleeve 8 is made of elastic material, so during the movement of the catheter body 1, it plays a role in ensuring that the protective sleeve 8 can be deformed and always wrapped around the surface of the catheter body 1 located outside the body.

[0044] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A vascular ultrasonic dilation catheter, comprising a catheter body (1) and a guide wire (2); Its characteristics are: The catheter body (1) is provided with a through hole (3), and the catheter body (1) is movably sleeved on the guide wire (2) through the through hole (3); The catheter body (1) is provided with a cavity (4), the cavity (4) is filled with liquid contrast agent, the side wall of the cavity (4) is provided with a through hole (5) communicating with the outside, the catheter body (1) is provided with a liquid supply mechanism for providing high-pressure liquid to the cavity (4), and the through hole (5) is provided with an elastic membrane (6); the elastic membrane (6) is evenly provided with strip-shaped cracks (7), and a plurality of the cracks (7) are evenly distributed on the surface of the elastic membrane (6), and the extension lines of the plurality of the cracks (7) intersect at the same point; The outer sliding sleeve of the catheter body (1) is provided with a protective sleeve (8), and the protective sleeve (8) is used to prevent leakage of liquid in the cavity (4).

2. The vascular ultrasonic dilation catheter according to claim 1, characterized in that: An annular mounting groove (9) is provided on the side wall of the through hole (5); the elastic membrane (6) is circular; the edge of the elastic membrane (6) is fixedly connected to the side wall of the mounting groove (9); and the ratio of the diameter of the mounting groove (9) to the diameter of the through hole (5) is 2-4.

3. The vascular ultrasonic dilation catheter according to claim 2, characterized in that: The liquid supply mechanism comprises a one-way valve (10) fixedly embedded in the side wall of the cavity (4); an extension tube (11) is inserted into the side wall of the through hole (3); the extension tube (11) is a hose, and the extension tube (11) extends into the cavity (4); a water bag (12) is fixedly installed at one end of the extension tube (11) located in the through hole (3).

4. The vascular ultrasonic dilation catheter according to claim 3, characterized in that: Bumps (13) are evenly and fixedly mounted on the side walls of the through hole (3), and bumps (13) are provided on both sides of the water bag (12).

5. The vascular ultrasonic dilation catheter according to claim 4, characterized in that: The protrusion (13) is annular.

6. The vascular ultrasonic dilation catheter according to claim 1, characterized in that: A mounting ring (14) is fixedly mounted on the end of the protective sleeve (8), and the mounting ring (14) is annular.

7. The vascular ultrasonic dilation catheter according to claim 6, characterized in that: The mounting ring (14) is made of stainless steel.

8. The vascular ultrasonic dilation catheter according to claim 1, characterized in that: The protective sleeve (8) is made of elastic material.

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