Embolism protector with different bending types

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an embolism protector with different bending types. The embolism protector comprises an umbrella body, a guide wire and a double-end catheter, the recovery end of the double-end catheter is in a bent state; the embolism protector further comprises a constant-bending lining core, and the constant-bending lining core is used for completely shaping the recovery end of the double-end catheter. And the constant-bending lining core is inserted into the recovery end of the double-end guide pipe, and the double-end guide pipe and the constant-bending lining core are subjected to heat treatment at the same time, so that the double-end guide pipe is subjected to shaping, bending and shaping. In the embolism protector, aiming at different blood vessel adjustments, the recovery end of the double-end catheter is bent and shaped into different shaping and bending states of 25-90 degrees or even U-shaped bends by using the fixed bending lining cores with different bending angles, so that the protection umbrella can be prevented from moving and falling off, the protection umbrella can be recovered more effectively, and the operation time is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an embolic protector with different bends. Background Art

[0002] In vascular interventional surgery (vascular sites include peripheral blood vessels, coronary arteries and carotid arteries), an embolic protector (embolic protector is a protective umbrella, hereinafter referred to as "protective umbrella") is placed at the distal end of the lesion site to provide patients with protection from tail embolism. Before stent implantation, the protective umbrella is placed at least 5 cm distal to the lesion site to prevent thrombus escape during the operation. After the stent is implanted, the protective umbrella is retrieved through the retrieval catheter, and the captured thrombus is taken out.

[0003] When delivering the protective umbrella, the catheter (delivery end, the thinner end) is pushed along the main guide wire to carry the protector into place, and after placement, it fits against the blood vessel wall and the delivery catheter is withdrawn; after the stent is implanted, the retrieval catheter (the thicker end) is pushed along the capture guide wire to retrieve the protective umbrella.

[0004] In the prior art, the above-mentioned protective umbrella has the following problems:

[0005] First, when the stent is placed and the umbrella is ready to be retrieved, the retrieval catheter passes through the inside of the stent. The degree of stenosis and curvature of the blood vessels will cause the retrieval catheter to "hit the wall". The grid of the stent blocks the advancement of the retrieval catheter, and the operator needs to try repeatedly. This process will cause the stent to shift after placement or affect the stent's wall adhesion.

[0006] Second, taking carotid artery surgery as an example, during surgery, the umbrella is usually placed at the distal end of the vascular lesion site to prevent the umbrella from falling during the balloon or stent push and reserve more space. The "Simons" effect of the cavernous carotid artery (cICA) region is in the IV type cICA. Due to the excessive flexion of the posterior knee relative to the anterior knee, the umbrella is opened and recovered. The movement of the umbrella retrieval catheter is contradictory. Pushing the umbrella retrieval catheter causes the umbrella body to migrate distally instead of retracting. In the cavernous carotid artery type cICA, when the umbrella body is pushed through the distal end, pushing the umbrella retrieval catheter forward will paradoxically stretch the umbrella head instead of compressing the umbrella body. This contradictory movement is the main reason why the umbrella cannot be recovered normally, so clinically, it is more necessary to rely on one's own means to make a quick-release retrieval catheter to recover the umbrella during surgery. In addition, if this effect is not taken into account at the beginning of deployment, it may cause the umbrella device to migrate / dislodge.

[0007] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0008] The purpose of the utility model is to provide an embolic protector with different bends to at least solve the above problems existing in the prior art.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] An embolic protector with different bends, the embolic protector comprising an umbrella body, a guide wire and a double-ended catheter;

[0011] The recovery end of the double-ended catheter is in a bent state;

[0012] The embolic protector further comprises a bend-fixing liner core, which is used to completely shape the recovery end of the double-ended catheter;

[0013] The bending fixing core is inserted into the recovery end of the double-end conduit, and the double-end conduit and the bending fixing core are heat treated simultaneously to shape and bend the double-end conduit.

[0014] As described above, for the embolic protector with different bends, preferably, the portion from the bend of the double-ended catheter to its distal end is a bend section, and the depth of the fixed bending liner inserted into the double-ended catheter is controlled to control the length of the bend section formed by shaping.

[0015] The embolic protector with different bends as described above is preferably such that the height difference D between the front and back of the cavernous sinus of the internal carotid artery is in the range of 4-6 mm, the front angle A is in the range of 25°-35°, and the back angle P is in the range of 75°-155°;

[0016] The angle between the double-ended catheter bending section and the extension line of the double-ended catheter body is in the range of 25°-45°, and the length of the bending section is in the range of 4-6 mm.

[0017] The embolic protector with different bends as described above is preferably such that the height difference D between the front and back of the cavernous sinus of the internal carotid artery is in the range of 7-9 mm, the front angle A is in the range of 25°-35°, and the back angle P is in the range of 25°-55°;

[0018] The angle between the double-ended catheter bending section and the extension line of the double-ended catheter body is in the range of 45°-90°, and the length of the bending section is in the range of 7-9 mm.

[0019] As described above, the embolic protector with different bends preferably has a height difference D value between the anterior and posterior branches in the cavernous sinus of the internal carotid artery greater than 8.88 mm, and when the blood vessel is a U-shaped bend, the angle between the bending section of the double-ended catheter and the extension line of the double-ended catheter body is 180°, and the length of the bending section ranges from 2 to 4 mm.

[0020] As described above, in the embolic protector with different bends, preferably, the material of the recovery end of the double-ended catheter is polyether block polyamide.

[0021] As described above, the embolic protector with different bends, preferably, barium sulfate and a developing ring are added to the recovery end of the double-ended catheter, and a hydrophilic coating is applied on the surface of the recovery end of the double-ended catheter.

[0022] As described above, for the embolic protector with different bend types, preferably, the fixed bend liner core is made of stainless steel.

[0023] Beneficial effects:

[0024] In the embolic protector, according to different blood vessel adjustments, the recovery end of the double-ended catheter is bent and shaped into different bending states of 25 to 90° or even a "U"-shaped bend by using a fixed bending core with different bending angles. This can avoid the migration and falling off of the protective umbrella, and can also more effectively recover the protective umbrella to reduce the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0026] Figure 1 The different curvature states of the blood vessels in the cavernous sinus of the internal carotid artery;

[0027] Figure 2 This is a schematic diagram of an embolic protector in a blood vessel according to an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of a fixed bending liner core and a double-ended conduit according to an embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the bent state of the recovery end of a double-ended catheter in one embodiment of the utility model.

[0030] In the figure: 1. protective umbrella; 2. guide wire; 3. double-ended catheter recovery end; 31. bending section; 4. fixed bending liner core. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the present invention.

[0032] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0034] According to the specific embodiment of the utility model, Figure 1-4 As shown, the utility model provides an embolic protector with different bends, the embolic protector comprising an umbrella body, a guide wire 2 and a double-ended catheter.

[0035] The recovery end of the double-ended catheter is in a bent state.

[0036] The embolic protector further comprises a bend fixing core 4, which is used to completely shape the recovery end of the double-ended catheter.

[0037] In one embodiment of the present application, under normal circumstances, after the carotid stent is implanted, the protective umbrella 1 is recovered, and the catheter needs to pass through the inside of the stent. When the tube mouth position is advanced, it is easy to encounter the stent grid and generate resistance (especially when the blood vessel at the stent implantation position is bent or tortuous); in the present application, the double-ended catheter recovery end 3 in a bent state has a certain bending angle; when the recovery end of the double-ended catheter with a certain bending angle is extended into the inside of the stent, the forward direction of the tube mouth of the pipeline recovery end can be adjusted by twisting the other end of the catheter outside the body, so as to avoid the recovery end of the catheter from "hitting the wall" after entering the inside of the stent, and thus effectively avoid the occurrence of accidents caused by the push of the catheter recovery end causing the displacement of the stent or affecting the wall adhesion state of the stent, thereby achieving rapid bending of the catheter and recovery of the protective umbrella 1, effectively shortening the operation time and greatly reducing the risk of embolus escape.

[0038] The bending liner core 4 is inserted into the recovery end of the double-end conduit, and the double-end conduit and the bending liner core 4 are heat-treated at the same time to shape and bend the double-end conduit.

[0039] The portion from the bend of the double-ended conduit to its distal end is a bend section 31 , and the length of the bend section 31 formed by shaping is controlled by controlling the depth of the fixed bending liner 4 inserted into the double-ended conduit.

[0040] In one embodiment of the present application, the length of the double-ended conduit bending section 31 can be controlled by inserting a bending liner core into the double-ended conduit to control the bending shaping length of the double-ended conduit recovery end 3. The bending liner core 4 has different bending angles, thereby shaping the recovery end of the double-ended conduit at different angles.

[0041] The heat treatment parameters include the insulation temperature and the insulation time. After the fixed bending liner core 4 is inserted into the recovery end of the double-ended conduit, insulation is carried out at the same time. The insulation temperature ranges from 80 to 200° C., and the insulation time ranges from 5 to 25 minutes.

[0042] In one embodiment of the present application, the double-ended conduit is placed together with the fixed bending liner core 4 in a muffle furnace for insulation heat treatment. During the insulation process, the double-ended conduit is softened and shaped, so that the recovery end of the double-ended conduit can be shaped to a bending angle consistent with the fixed bending liner core 4, and such a setting will not cause damage or destruction to the double-ended conduit, thereby ensuring that the recovery end of the double-ended conduit can be bent and shaped without damage.

[0043] When the height difference D between the anterior and posterior branches in the cavernous sinus of the internal carotid artery is in the range of 4-6 mm, the anterior angle A is in the range of 25°-35°, and the posterior angle P is in the range of 75°-155°; the angle between the double-ended catheter bending section 31 and the extension line of the double-ended catheter body is in the range of 25°-45°, and the length of the bending section 31 is in the range of 4 to 6 mm.

[0044] The tortuosity of the cavernous carotid artery (cICA) is expressed as the D / AP ratio. D is the height difference between the anterior and posterior genu, measured from the posterior peak to the anterior genu valley. For Type ⅠA and Type ⅠB with no bends in the horizontal segment, the D value is set to 1 mm. A and P are the sum of the anterior angle (A) and the posterior angle (P). The vertices of the angle originate from the anterior wall of the anterior genu and the posterior wall of the posterior genu. The vector is drawn along the long axis of the ICA. Among them, the larger the P angle, the larger the range of D values ​​(P has a greater influence on the bending angle than A), that is, when A is an acute angle, the larger the P angle, the smaller the height difference between the anterior and posterior genu.

[0045] In one embodiment of the present application, Figure 1 As shown, the bent section 31 of the double-ended catheter is bent by 25°-45°, and the length of the bent section 31 is controlled within 4-6 mm, and the shaped double-ended catheter is applied to Figure 1 The middle blood vessel is in the Type1-Type2 state. At this time, the catheter bent into a set value is more convenient for passing through the blood vessel in this curved state.

[0046] When the recovery end of the double-ended catheter is within this shaping range, it can be used for Figure 1 It provides a better bending effect for blood vessels in the Type 1-Type 2 state, and when the protective umbrella 1 slides to the bending point of the blood vessel, a faster and more stable recovery operation can be achieved through this angle.

[0047] When the height difference D between the anterior and posterior branches in the cavernous sinus of the internal carotid artery is in the range of 7-9 mm, the anterior angle A is in the range of 25°-35°, and the posterior angle P is in the range of 25°-55°; the angle between the double-ended catheter bending section 31 and the extension line of the double-ended catheter body is in the range of 45°-90°, and the length of the bending section 31 is in the range of 7 to 9 mm.

[0048] In one embodiment of the present application, Figure 1 As shown, the bent section 31 of the double-ended catheter is bent 45°-90°, and the length of the bent section 31 is controlled within 7-9 mm, and the shaped double-ended catheter is applied to Figure 1 The middle blood vessel is in the Type 3-Type 4 state. At this time, the catheter bent into a set value is more convenient for passing through this curved blood vessel.

[0049] When the recovery end of the double-ended catheter is within this shaping range, it can be used for Figure 1 When the protective umbrella 1 is inserted into a tortuous blood vessel with an S-bend in a Type 3-Type 4 state, the resistance caused by the recovery end 3 of the double-ended catheter hitting the blood vessel wall is effectively reduced, and damage to the blood vessel is avoided, thereby ensuring a fast and stable recovery operation of the protective umbrella 1.

[0050] In the cavernous sinus of the internal carotid artery, the height difference D between the anterior and posterior branches is greater than 8.88 mm. When the blood vessel is U-shaped, the angle between the double-ended catheter bending section 31 and the extension line of the double-ended catheter body is 180°, and the length of the bending section 31 is in the range of 2 to 4 mm.

[0051] In one embodiment of the present application, the angle between the bending section 31 and the extension line of the double-ended catheter body is 180°, indicating that the recovery end of the double-ended catheter is bent to form a U-shaped structure. This structure can more conveniently recover the protective umbrella 1 in the U-shaped bend of the blood vessel with a D value greater than 8.88 mm.

[0052] The material of the double-ended catheter recovery end 3 is polyether block polyamide, which has excellent fatigue resistance; good rebound and elastic recovery; precise dimensional stability; and excellent processing performance.

[0053] The double-ended conduit recovery end 3 is added with barium sulfate and a developing ring, and a hydrophilic coating is applied on the surface of the double-ended conduit recovery end 3. This makes the double-ended conduit recovery end 3 have a better developing effect; and after the double-ended conduit is treated with the hydrophilic coating, the surface friction coefficient of the double-ended conduit is low, so that the double-ended conduit has a smaller pushing resistance.

[0054] The material of the fixed bending liner core 4 is stainless steel. In one embodiment of the present application, the material of the fixed bending liner core is 304L stainless steel or 316L stainless steel, which is more stable and durable.

[0055] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. An embolic protector with different bends, characterized in that: The embolic protector comprises an umbrella body, a guide wire and a double-ended catheter; The recovery end of the double-ended catheter is in a bent state; The embolic protector further comprises a bend-fixing liner core, which is used to completely shape the recovery end of the double-ended catheter; The bending fixing core is inserted into the recovery end of the double-end conduit, and the double-end conduit and the bending fixing core are heat treated simultaneously to shape and bend the double-end conduit.

2. The embolic protector with different bends according to claim 1, characterized in that: The portion from the bend of the double-ended conduit to its distal end is a bend section, and the length of the bend section formed by shaping is controlled by controlling the depth of the fixed bending liner inserted into the double-ended conduit.

3. The embolic protector with different bends according to claim 2, characterized in that: When the height difference D between the anterior and posterior genus in the cavernous sinus of the internal carotid artery is in the range of 4-6 mm, the anterior angle A is in the range of 25°-35°, and the posterior angle P is in the range of 75°-155°; The angle between the double-ended catheter bending section and the extension line of the double-ended catheter body is in the range of 25°-45°, and the length of the bending section is in the range of 4-6 mm.

4. The embolic protector with different bends according to claim 2, characterized in that: When the height difference D between the anterior and posterior genus in the cavernous sinus of the internal carotid artery is in the range of 7-9 mm, the anterior angle A is in the range of 25°-35°, and the posterior angle P is in the range of 25°-55°; The angle between the double-ended catheter bending section and the extension line of the double-ended catheter body is in the range of 45°-90°, and the length of the bending section is in the range of 7-9 mm.

5. The embolic protector with different bends according to claim 2, characterized in that: When the height difference D between the anterior and posterior branches in the cavernous sinus of the internal carotid artery is greater than 8.88 mm and the blood vessel is a U-shaped bend, the angle between the bending section of the double-ended catheter and the extension line of the double-ended catheter body is 180°, and the length of the bending section ranges from 2 to 4 mm.

6. The embolic protector with different bends according to claim 2, characterized in that: The material of the recovery end of the double-ended catheter is polyether block polyamide.

7. The embolic protector with different bends according to claim 6, characterized in that: Barium sulfate and a developing ring are added to the recovery end of the double-ended catheter, and a hydrophilic coating is coated on the surface of the recovery end of the double-ended catheter.

8. The embolic protector with different bends according to any one of claims 1 to 7, characterized in that: The fixed bending liner core is made of stainless steel.

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