Embolism dredging device and thrombus aspiration catheter

Abstract

The present invention provides an embolism clearing device and a thrombus aspiration catheter, which relate to the technical field of embolism treatment. The thrombus aspiration catheter comprises a catheter and a Y-type hemostatic valve. The Y-type hemostatic valve is installed at the proximal end of the catheter. The proximal end of the Y-type hemostatic valve is provided with an embolism clearing device. The embolism clearing device comprises a clearing element, a supporting element, and a limiting locking element: the clearing element is located at the distal end, and the clearing element comprises a spiral coil formed with a distal tip; the supporting element, the distal end of the supporting element is fixedly connected to the proximal end of the spiral coil, or the supporting element passes through the spiral coil and is fixedly connected to the inner wall of the spiral coil; the limiting locking element is arranged on the outer wall of the supporting element, and comprises a locking button which can press and release the outer wall of the supporting element. The embolism clearing device of the present invention can crush, soften and clear the thrombus blocked in the catheter, without the need for staff to withdraw the catheter for flushing, thereby avoiding the catheter being sent into the human body again for aspiration to cause pain to the patient.

Description

Technical Field

[0001] The present invention relates to the technical field of embolism treatment, and in particular to an embolism clearing device and a thrombus aspiration catheter. Background Art

[0002] In the field of interventional treatment of AIS, percutaneous aspiration thromboembolectomy (PAT) is another emerging technology that has developed rapidly after stent thrombectomy. Percutaneous aspiration thromboembolectomy (PAT) has become a favorable technology for interventional thrombectomy because of its rapid recanalization speed and good imaging and clinical results. It is a fast and economical technology and is often used as an auxiliary means of pharmacological thrombolysis to increase the thrombolytic effect, reduce the dose of thrombolytic drugs, and reduce the risk of bleeding.

[0003] The existing thrombus aspiration catheter usually consists of a catheter, a connector, and a suction device.

[0004] During thrombus removal, the skin and tissue are punctured, a suitable thrombus aspiration catheter is selected, and the catheter is inserted close to the thrombus. Once the target area is reached, the suction device generates negative pressure to aspirate the thrombus to achieve complete and intact removal of the thrombus. This technology is different from the previous technology of using a separator to destroy the thrombus at the distal tip of the catheter lumen. This technology can reduce the operation time while reducing the number of thrombectomies required for reperfusion.

[0005] However, during the aspiration process, large blood clots will often block the middle section of the catheter body and the distal opening of the catheter, causing the doctor to withdraw the catheter for flushing multiple times during surgery and then reinsert it into the human body for aspiration. The complicated operation may cause pain to the patient and affect the treatment effect.

[0006] Therefore, there is room for improvement, and the present invention provides an embolism clearing device and a thrombus aspiration catheter. Summary of the invention

[0007] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide an embolism clearing device, the specific scheme is as follows:

[0008] An embolism clearing device, the embolism clearing device is used in a catheter, and the embolism clearing device is provided with a distal end and a proximal end;

[0009] The embolism clearing device includes a clearing element, a supporting element, and a limiting locking element with a locking function:

[0010] The dredging element is located at the distal end, and includes a spiral coil formed with a distal tip. The spiral coil can reciprocate in the catheter for one or more times to dredge the thrombus, and can also dredge the blood clot along the spiral direction of the spiral coil.

[0011] A support element, wherein the distal end of the support element is fixedly connected to the proximal end of the spiral coil, or the support element passes through the spiral coil and is fixedly connected to the inner wall of the spiral coil;

[0012] The limit locking element is arranged on the outer wall of the supporting element, and comprises a locking button which can perform a pressing action and a releasing action on the outer wall of the supporting element.

[0013] Under the action of the support element, the dredging element has a certain structural strength and hardness, and can move flexibly. Therefore, when the middle section of the catheter and the distal opening of the catheter are blocked by thrombi, this type of embolic dredging device can be used for the thrombus aspiration catheter during operation. When the support element is in motion, it can drive the dredging element into the catheter until it is close to the location of the thrombus. Through the setting of the spiral coil, when the spiral coil moves along the spiral rotation direction, it can crush, separate or dredge the thrombus blocked in the catheter, quickly remove any obstructions or flow restrictions in the catheter, and the spiral coil can also pull old thrombi and other materials in the catheter until the proximal end of the catheter is put into position, promoting the transmission of negative pressure in the catheter and sufficient flow gap in the catheter.

[0014] After use, the outer wall of the support element is pressed tightly by the locking button on the limit locking element, thereby stopping the movement of the support element and the dredging element to avoid interfering with the normal operation of the catheter.

[0015] Furthermore, on the basis of a certain gap between the spiral coil and the catheter, the inner diameter and the outer diameter of the spiral coil remain uniform or change in diameter along the direction from the proximal end to the distal end.

[0016] Further, the spiral coil is provided with at least one;

[0017] When one spiral coil is provided, the proximal end of the spiral coil is fixedly connected to the distal end of the support element;

[0018] When there are two or more spiral coils, the inner wall of the spiral coil is fixedly connected to the outer wall of the supporting element.

[0019] Therefore, when the spiral coil is a single spiral coil of equal diameter, due to the characteristics of its spiral structure, it can significantly crush the acute / subacute thrombus and can also intercept and transport old thrombus.

[0020] When the spiral coil has a two-stage structure or a multi-stage structure, different spiral coils can perform capturing actions at the same time, effectively solving a large number of embolic thrombi and reducing the number of repeated dredging times. Moreover, since the inner wall of the spiral coil with a two-stage structure or a multi-stage structure is connected to the supporting element through a larger area, the overall supporting strength is higher.

[0021] Furthermore, the helical coil has a helix angle, and the helix angle ranges from 36° to 45°.

[0022] Therefore, a proper helical angle can lead to a stronger stirring effect, which helps to capture and transport old thrombi, and a proper helical angle can also help to form a stronger negative pressure area, in which the fluid and the thrombi in the fluid will be more strongly attracted and moved. Further, the material of the spiral coil is stainless steel or nickel titanium.

[0023] Therefore, stainless steel has high strength, high hardness, corrosion resistance and biocompatibility, and nickel titanium has superelasticity and biocompatibility, so that the spiral coil can have a larger shape change ability.

[0024] Furthermore, the supporting element is in a tubular structure as a whole, and a limiting boss is provided at the proximal end;

[0025] The limiting locking element also includes a base for installing the locking button, and the base is provided with a limiting groove adapted to the limiting boss.

[0026] Therefore, after the supporting element drives the clearing element to move a certain distance, if the limiting boss is in the limiting groove, the limiting boss is blocked by the base, thereby controlling the supporting element and the clearing element to stop moving, preventing the clearing element from extending out of the distal end of the catheter and stimulating the blood vessel.

[0027] Another object of the present invention is to provide a thrombus aspiration catheter, the specific scheme of which is as follows:

[0028] A thrombus aspiration catheter comprises a catheter and a Y-type hemostatic valve. The Y-type hemostatic valve is installed at the proximal end of the catheter. The proximal end of the Y-type hemostatic valve is provided with the embolism clearing device. The base is fixedly connected to the proximal end of the Y-type hemostatic valve. The clearing element and part of the supporting element are inside the catheter.

[0029] Therefore, when the thrombus aspiration catheter is working, if the negative pressure generated cannot be transmitted to the distal port of the catheter, that is, there is a large / old thrombus inside the catheter and embolism occurs, the embolic clearing device selectively advances and retracts relative to the thrombus, removing any blockage or flow restriction in the inner cavity of the catheter caused by the embolic thrombus retained in the inner cavity of the catheter during aspiration.

[0030] Furthermore, when the locking button performs the pressing action, the supporting element is stationary relative to the catheter;

[0031] When the locking button is released, the supporting element can move from the proximal end to the distal end relative to the catheter.

[0032] In this way, the staff only needs to operate the locking button to control whether the clearing element can move in the catheter.

[0033] Furthermore, when the limiting boss is in the limiting groove, the clearing element remains inside the catheter.

[0034] Therefore, when the support element reaches the maximum range of movement, it can prevent the clearing element from extending out of the distal end of the catheter and irritating the blood vessels.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) During the period when the present invention is used for catheter aspiration, the embolic clearing device of the present invention can crush, soften and clear the thrombus blocked in the catheter, without the need for the staff to withdraw the catheter for flushing, thereby avoiding the catheter being inserted into the human body again for aspiration, which would cause pain to the patient.

[0037] (2) The present invention can be adapted to thrombus aspiration catheters of different effective lengths, ensuring efficient dredging of large and old thrombi in the catheter while effectively removing flow restrictions at the embolic site. It is also equipped with a limit locking element to prevent the dredging element from extending out of the distal end of the catheter and irritating the blood vessels, making it easy to use and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is an overall schematic diagram of the thrombus aspiration catheter of the present invention;

[0039] Figure 2 It is an overall schematic diagram of the embolism clearing device of the present invention;

[0040] Figure 3 A cross-sectional view of a thrombus aspiration catheter showing a clearing element near a Y-type hemostatic valve;

[0041] Figure 4 A cross-sectional view of a thrombus aspiration catheter showing a clearing element in the inner lumen of the catheter;

[0042] Figure 5 is a schematic diagram of a first shape of a spiral coil;

[0043] Figure 6 is a schematic diagram of a second shape of the spiral coil;

[0044] Figure 7 is a schematic diagram of the third shape of the spiral coil;

[0045] Figure 8 is a schematic diagram of the fourth shape of the spiral coil;

[0046] Fig. 9 is a schematic diagram of a first shape of the distal tip of the helical coil;

[0047] Fig.10 is a schematic diagram of a second shape of the distal tip of the spiral coil;

[0048] Fig.11 is a schematic diagram of a third shape of the distal tip of the spiral coil;

[0049] Fig.12 A schematic diagram showing the specific structure of the limiting locking element of the thrombus aspiration catheter;

[0050] Fig.13 for Figure 4 Enlarged schematic diagram of part A in the middle.

[0051] Figure numerals: 1. catheter; 2. embolism clearing device; 3. clearing element; 31. spiral coil; 311. distal tip; 4. supporting element; 41. limiting boss; 5. limiting locking element; 51. base; 511. conical boss; 512. limiting groove; 52. locking button; 53. spring tube clamp; 531. inner hole; 6. Y-type hemostatic valve. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0053] In the prior art, during the operation of the thrombus aspiration catheter, the staff withdraws the catheter for flushing, but this method is inefficient in clearing large thrombi and old thrombi blocked in the catheter, and the flow restriction at the embolism site cannot be removed, and there is a risk of irritation and damage to the blood vessels.

[0054] like Figure 1 The present invention proposes an embolism clearing device, which is used in a catheter 1. The embolism clearing device 2 not only does not require the staff to withdraw the catheter 1, but can also remove different types of thrombi blocked in the catheter 1.

[0055] It should be noted that different types of thrombi include acute thrombi, subacute thrombi, and old thrombi, which may be large or small. Acute thrombi usually form faster, showing fresher, softer, and more active characteristics; subacute thrombi form relatively slowly, showing older and more stable characteristics; some old thrombi develop gradually from acute or subacute thrombi over a period of time, and may undergo fibrosis and scar formation, and appear harder and more stable.

[0056] Combination Figure 1 and Figure 2 The embolism clearing device 2 includes a clearing element 3, a supporting element 4 and a limiting locking element 5 with a locking function. The supporting element 4 is used to switch the state of the supporting element 4 through the limiting locking element 5, thereby controlling the movement of the clearing element 3 in the catheter 1, crushing and removing different blood clots, and effectively removing the flow restriction at the embolism in the catheter 1, ensuring that the negative pressure environment in the catheter 1 can normally aspirate the blood clots in the human body.

[0057] like Figure 3 For ease of description, the embolism clearing device 2 is provided with a distal end and a proximal end.

[0058] Combination Figure 3 and Figure 4 , wherein the dredging element 3 is located at the distal end, and the dredging element 3 includes a spiral coil 31, which is used to dredge the thrombus. Specifically, the spiral coil 31 can perform reciprocating dredging in the catheter 1 once or multiple times, and can also dredge the thrombus along the spiral rotation direction of the spiral coil 31. The spiral coil 31 is formed with a distal tip 311, and the setting of the distal tip 311 on the spiral coil 31 is conducive to traversing and capturing the thrombus. The proximal end of the spiral coil 31 is fixedly connected to the distal end of the support element 4, or the inner wall of the spiral coil 31 is fixedly connected to the support element 4, and the fixation can be achieved by laser welding. The distal tip 311 is the first structure to contact the thrombus in the entire embolism dredging device 2, which is conducive to the substantial embolism removal of the thrombus by the spiral coil 31 after the spiral coil 31 passes through the thrombus.

[0059] The distal tip 311 is a part of the distal end of the spiral coil 31 and is conical or has a rounded tip, which is convenient for flexible movement in the catheter 1 and for passing through or resisting thrombus embolism.

[0060] There are three situations for the shape of the distal tip setting on the spiral coil, such as Figure 8 , Fig. 9 , Fig.10 The different shapes and appearances of the distal tip 311 of the spiral coil can effectively penetrate the thrombus.

[0061] The material of the spiral coil 31 is stainless steel or nickel titanium. Stainless steel has high strength, high hardness, corrosion resistance and biocompatibility. Nickel titanium has superelasticity and biocompatibility, so that the spiral coil 31 can have a large shape change ability. When making the spiral coil 31, stainless steel or nickel titanium is coaxially wound.

[0062] During the winding process, the coils of the spiral coil 31 can be arranged at uniform intervals or at specific intervals, without specific restrictions, and can be specifically set for the above-mentioned different types of thrombi. For example, for large thrombi in acute thrombi, the intervals between the coils of the spiral coil 31 can be set larger.

[0063] In addition to the spacing, it should be noted that the helical coil 31 has limitations on the helix angle, inner diameter and outer diameter.

[0064] The helix pitch angle refers to the inclination angle of each coil or the central axis of the spiral coil 31 relative to the horizontal plane. In the spiral coil 31, this angle describes the vertical position of each coil relative to the previous coil.

[0065] In this embodiment, the helical coil 31 has a helical angle, and the helical angle ranges from 36° to 45°.

[0066] As a result, when the spiral coil 31 works in the catheter 1, the following effects will occur:

[0067] First, a proper helix angle will lead to a stronger stirring effect. Specifically, a larger helix angle will generally lead to a stronger spiral flow. This spiral flow will form a vortex in the catheter 1, producing a stirring effect. For large thrombi, this stirring effect may increase the force applied to them, helping to break up or disintegrate the large thrombi into smaller particles, making it easier for them to pass through the catheter 1, making them easier to pass or be captured.

[0068] Second, an appropriate helical angle can help capture and transport old thrombi. The adjustment of the helical angle may affect the interaction between the spiral coil 31 and the fluid, and the vortex formed can form a local low-pressure area around the spiral coil 31, which helps to attract the surrounding fluid, making it easier to capture the material around the fluid, that is, the thrombus.

[0069] Third, a proper helix angle helps to form a stronger negative pressure area, in which the fluid and the thrombus in the fluid will be more strongly attracted and moved.

[0070] As for the inner diameter and outer diameter, the inner diameter and outer diameter of the spiral coil 31 are uniform or change regularly from the proximal end to the distal end on the basis of a certain gap with the catheter 1. There are the following four situations, and the shape and appearance of the spiral coil 31 are different in different situations.

[0071] First, the inner diameter and outer diameter of the spiral coil 31 are uniform and constant along the direction from the proximal end to the distal end, and the spiral coil 31 is provided with one. Figure 5 At this time, the spiral coil 31 is an equal-diameter spiral coil 31. Due to the characteristics of its spiral structure, it can significantly crush the thrombus and transport the old thrombus for acute thrombus and subacute thrombus.

[0072] Second, the inner diameter and outer diameter of the spiral coil 31 gradually increase from the proximal end to the distal end, then gradually decrease, then gradually increase, and finally gradually decrease. Similarly, the spiral coil 31 can be set to one or more. Figure 6 At this time, the spiral coil 31 is a structure that is small in the middle and large on both sides, similar to a spindle shape. The larger diameter part can better capture old thrombi, which is more conducive to the thrombi being wrapped around the spiral coil 31, making it easier for the user to withdraw the thrombi from the catheter 1 along with the clearing element 3.

[0073] Third, the inner diameter and outer diameter of the spiral coil 31 gradually decrease from the proximal end to the distal end. The spiral coil is in the shape of a cone head. Figure 7 , the part with a larger diameter can better capture the thrombus, and the part with a smaller diameter is more conducive to passing through the thrombus.

[0074] Fourth, the inner diameter and outer diameter of the spiral coil 31 are uniform and constant along the direction from the proximal end to the distal end, and there are two or more spiral coils 31, and there is no specific limitation. Fig.11 , two spiral coils 31 are respectively fixed on the outer wall of the support element 4. At this time, the spiral coil 31 is a double-stage structure, and the two spiral coils 31 can perform capture action at the same time, effectively solving a large number of embolic thrombi, reducing the number of repeated dredging times, and because the inner wall of the spiral limiter of the double-stage structure is connected to the support element 4 through a larger area, the overall support strength is higher.

[0075] It should be noted that the outer diameter of the spiral coil 31 and the inner diameter of the catheter 1 are designed with an optimal gap, and there is a strict tolerance. In the process of clearing the embolic thrombus in the adapted catheter 1, the flow restriction caused by the thrombus is removed, and the negative pressure transmission failure is eliminated. In the above four situations, the outer diameter of the spiral coil 31 cannot conflict with the optimal gap between the inner diameter of the catheter 1.

[0076] Secondly, the support element 4 is a tubular structure as a whole, and adopts a straight tube of stainless steel or nickel-titanium, which has good pushing and supporting properties. Under the action of the support element 4, the dredging element 3 has a certain structural strength and hardness, and can move flexibly.

[0077] Secondly, if Fig.12 The limiting locking element 5 is arranged on the outer wall of the supporting element 4, which is a guide wire torque structure. Please refer to SeaDragon2 TM The product of this type of Torque Device includes a base 51 and a locking button 52. The base 51 is cylindrical in shape and sleeved on the outer wall of the supporting element 4. The locking button 52 is installed on the base 51. A locking mechanism linked to the locking button 52 is provided inside the base 51. The locking button 52 can press down and rebound the outer wall of the supporting element 4. When pressed down, it cooperates with the locking mechanism to realize the release action of the supporting element 4. When rebounding, it cooperates with the locking mechanism to realize the pressing action of the supporting element 4.

[0078] The difference from the above products is that a coaxially arranged spring tube clamp 53 is sleeved on the outer wall of the proximal end of the base 51. The spring tube clamp 53 is made of superelastic material and has multiple cutouts on the outer wall. A conical inner hole 531 is opened in the center of the spring tube clamp 53. The distal end of the inner hole 531 is used to clamp the outer wall of the support element 4, and the distal end is used to be movably sleeved on the outer wall of the support element 4. Due to the existence of the cutout, the distal end of the spring tube clamp 53 can be stretched open by the conical boss 511 at the proximal end of the base 51. When the spring tube clamp 53 is not in use, it will not hinder the operation of the support element 4. When the spring tube clamp 53 is pushed off from the base 51 toward the proximal end, the distal end of the spring tube clamp 53 can clamp the support element 4.

[0079] When the middle section of the catheter 1 and the distal opening of the catheter 1 are blocked by thrombi, the locking button 52 is pressed down to put the supporting element 4 in motion, which can drive the clearing element 3 to extend into the catheter 1, and under the guidance of the distal tip 311, until it is close to the location of the thrombus. Through the setting of the spiral coil 31, the spiral coil 31 can crush, separate or clear the thrombus blocking the catheter 1 when it moves along the spiral direction, and quickly remove any obstruction or flow restriction in the catheter 1. The spiral coil 31 can also pull the old thrombus and other materials in the catheter 1 until the proximal end of the catheter 1 is put into position, thereby promoting the transmission of negative pressure in the catheter 1 and sufficient flow gap in the catheter 1.

[0080] After use, release the locking button 52 to press the outer wall of the support element 4 tightly, thereby stopping the movement of the support element 4 and the clearing element 3 to avoid interfering with the normal operation of the catheter 1.

[0081] Optimized, combined Figure 4 and Fig.13 The proximal end of the support element 4 is provided with a cylindrical limiting boss 41, and the specification of the limiting boss 41 only needs to be larger than the outer diameter of the support element 4. The proximal end of the base 51 is provided with a limiting groove 512 adapted to the limiting boss 41. Therefore, after the support element 4 drives the dredging element 3 to move a certain distance, if the limiting boss 41 is in the limiting groove 512, the limiting boss 41 is blocked by the base 51, thereby controlling the support element 4 and the dredging element 3 to stop moving, and the dredging element 3 remains inside the catheter 1, preventing the dredging element 3 from extending out of the distal end of the catheter 1 and stimulating the blood vessel.

[0082] For the above-mentioned embolism clearing device 2, as Figure 1The present invention provides a thrombus aspiration catheter 1, which includes a catheter 1 and a Y-type hemostatic valve 6. The Y-type hemostatic valve 6 can also be replaced with a catheter 1 seat. The Y-type hemostatic valve 6 is installed at the proximal end of the catheter 1. The proximal end of the Y-type hemostatic valve 6 is provided with an embolism dredging device 2, specifically, a base 51 is fixedly connected to the proximal end of the Y-type hemostatic valve 6, and a dredging element 3 and a part of the supporting element 4 are inside the catheter 1. The thrombus aspiration catheter 1 is provided with negative pressure to achieve aspiration by a suction pump.

[0083] When the locking button 52 is pressed, the support element 4 is stationary relative to the catheter 1. When the locking button 52 is released, the support element 4 can move from the proximal end to the distal end relative to the catheter 1. The staff only needs to operate the locking button 52 to control whether the dredging element 3 can move in the catheter 1.

[0084] When in use, the Seldinger puncture technique is used to advance the working guide wire to a point close to the thrombus embolism, and the thrombus aspiration catheter 1 is sent to the designated blood vessel position along the working guide wire. The suction pump tank joint is connected to the suction extension tube horn joint, and the suction extension tube is connected to the Y-type hemostatic valve 6 or the catheter 1 seat. The clearing element 3 on the embolism clearing device 2 is placed in the Y-type hemostatic valve 6, and the Y-type hemostatic valve 6 is locked. The support element 4 is fixed with the limit locking element 5, and the suction pump is turned on to generate suction negative pressure to start aspirating the intravascular thrombus embolism. The negative pressure generated by the suction pump cannot be transmitted to the distal port of the catheter 1, that is, when there is a large / old thrombus or other thrombus embolizing inside the suction catheter 1, the embolism clearing device 2 selectively moves forward and retracts relative to the thrombus embolism to remove any blockage or flow restriction in the inner cavity caused by the embolic thrombus remaining in the inner cavity of the catheter 1 during aspiration.

[0085] Figure 3 As shown, before the releasing action is performed, the clearing element 3 is located near the Y-type hemostatic valve 6. Figure 4 What is shown is that after the release action, the clearing element 3 is in the inner cavity of the catheter 1, and the limiting boss 41 is in the limiting groove 512, and the supporting element 4 and the clearing element 3 stop moving.

[0086] It should be noted that the embolism clearing device 2 is only provided with clearing elements 3 and supporting elements 4, but not with limiting locking elements 5. The clearing elements 3 and supporting elements 4 can cooperate to extend into the catheter 1 and perform embolism treatment. As for the limiting locking element 5, in addition to controlling the state of the supporting element 4 and ensuring that the clearing element 3 does not extend out of the distal end of the catheter 1, it can also cooperate with the supporting element 4 to provide additional stirring effect to the spiral coil 31.

[0087] like Fig.12This is because a portion of the support element 4 is outside the catheter 1 near the proximal end, and the spring tube clamp 53 on the limiting locking element 5 cooperates with this portion of the support element 4 to provide an additional stirring effect.

[0088] The specific process of providing an additional stirring effect is: first, control the locking button 52 to be pressed down to release, and then release the locking button 52 to tighten. At this time, the support element 4 located near the proximal end of the limit locking element 5 can be moved axially, and the spring tube clamp 53 is controlled to leave the base 51 and clamp the support element 4, so that the staff can hold the spring tube clamp 53 to drive this part of the support element 4 to twist and store energy. After that, control the locking button 52 to be pressed down to release, and the spiral coil 31 continues to move relative to the catheter 1. At the same time, the energy stored in the proximal support element 4 is released, driving the distal support element 4 and the spiral coil 31 to twist, thereby stirring the thrombus and other substances on the inner wall of the catheter 1.

[0089] The process is essentially to change the displacement and posture of the spiral coil 31 by controlling the switching of the working state of the locking button 52, the clamping state of the spring tube clamp 53, and whether the supporting element 4 is twisted, so as to apply a stirring force to the previously retained thrombus, thrombus with strange shape, thrombus with hard texture, etc. inside the catheter 1, so as to facilitate the separation of the thrombus from the catheter 1. It should be noted that the thrombus is not limited to the thrombus in the above-mentioned cases and is not limited thereto.

[0090] The support element 4 can perform a twisting action with reference to the position of the spiral coil 31 , for example, the spiral coil 31 is near the Y-type hemostatic valve 6 , the spiral coil 31 is near the thrombus, or the spiral coil 31 is near the distal end of the catheter 1 .

[0091] It should be noted that, in the limit locking element 5, the locking button 52 will be released before the tightening action is performed. Compared with the conventional device that realizes the tightening function by pressing down the locking button 52, at this time, the staff does not need to be distracted to control the locking button 52 to perform the tightening action while holding the spring pipe clamp 53 to twist the supporting element 4. After completing the dynamic process of twisting, the staff presses down the locking button 52 to release the action. The whole process is reasonably designed and easy to operate.

[0092] In this way, the present invention, by providing the clearing element 3, the supporting element 4 and the limiting locking element 5, can not only flexibly control the movement range of the supporting element 4 to prevent the clearing element 3 from extending out of the distal end of the catheter 1 to stimulate the blood vessel, but also flexibly control the movement mode of the supporting element 4 and the clearing element 3, so as to better adapt to different embolism situations occurring in the catheter 1.

[0093] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An embolism clearing device, characterized in that: The embolism clearing device (2) is used in a catheter (1), and the embolism clearing device (2) is provided with a distal end and a proximal end; The embolism clearing device (2) comprises a clearing element (3), a supporting element (4) and a position limiting locking element (5) with a locking function: The dredging element (3) is located at the distal end, and the dredging element (3) includes a spiral coil (31) formed with a distal tip (311). The spiral coil (31) can perform reciprocating dredging in the catheter (1) once or multiple times, and can also dredge blood clots along the spiral direction of the spiral coil (31); A support element (4), wherein the distal end of the support element (4) is fixedly connected to the proximal end of the spiral coil (31), or the support element (4) passes through the spiral coil (31) and is fixedly connected to the inner wall of the spiral coil (31); A position limiting locking element (5) is arranged on the outer wall of the supporting element (4), and comprises a locking button (52) capable of pressing and releasing the outer wall of the supporting element (4); On the basis of a gap between the catheter (1), the inner diameter and the outer diameter of the spiral coil (31) are uniform and unchanged or change in diameter along the direction from the proximal end to the distal end; At least one spiral coil (31) is provided; When one spiral coil (31) is provided, the proximal end of the spiral coil (31) is fixedly connected to the distal end of the support element (4); When there are more than two spiral coils (31), the inner wall of the spiral coil (31) is fixedly connected to the outer wall of the supporting element (4); The helical coil (31) has a helical angle, and the helical angle ranges from 36° to 45°; The supporting element (4) is in the form of a tubular structure as a whole, and a limiting boss (41) is provided at the proximal end; The limiting locking element (5) further comprises a base (51) for mounting a locking button (52), and a limiting groove (512) adapted to the limiting boss (41) is formed on the base (51).

2. The embolism clearing device according to claim 1, characterized in that: The material of the spiral coil (31) is stainless steel or nickel-titanium alloy.

3. A thrombus aspiration catheter, comprising a catheter (1) and a Y-shaped hemostatic valve (6), wherein the Y-shaped hemostatic valve (6) is installed at the proximal end of the catheter (1), characterized in that: The proximal end of the Y-type hemostatic valve (6) is provided with the embolic clearing device (2) as claimed in claim 1, the base (51) is fixedly connected to the proximal end of the Y-type hemostatic valve (6), and the clearing element (3) and part of the supporting element (4) are located inside the catheter (1).

4. The thrombus aspiration catheter according to claim 3, characterized in that: When the locking button (52) is in a pressing action, the supporting element (4) is stationary relative to the catheter (1); When the locking button (52) is released, the supporting element (4) can move from the proximal end to the distal end relative to the catheter (1).

5. The thrombus aspiration catheter according to claim 4, characterized in that: When the limiting boss (41) is in the limiting groove (512), the clearing element (3) remains inside the catheter (1).

Images