Constraining guide pipe of supporting ring

Abstract

The invention discloses a restraining catheter of a supporting ring, and belongs to the field of medical instruments, the restraining catheter is used for storing the supporting ring, the supporting ring comprises a supporting ring main body and an anchoring part, the anchoring part protrudes out of the supporting ring main body, and the supporting ring main body can radially contract or expand; a limiting groove matched with the anchoring piece is formed in the front end of the collecting guide pipe, and the limiting groove is communicated with an inner channel of the collecting guide pipe; the limiting grooves in one-to-one correspondence with the anchoring pieces are formed in the front end of the bundling guide pipe, the anchoring pieces move freely in the limiting grooves with the bundling guide pipe as the center, the position of the supporting ring can be determined conveniently when the supporting ring is placed, and accurate release is achieved; an arc chamfer is arranged at the contact part of the limiting groove and the anchoring piece, so that the bearing capacity of the restraining guide pipe is increased, the contact area can be further reduced to point contact, and the frictional resistance between the limiting groove and the supporting ring is reduced; the contact portion of the limiting groove and the anchoring piece is located at the root of the tip end of the anchoring piece, the anchoring piece hardly deforms during compression, and damage to the anchoring piece is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to a constriction catheter for a support ring. Background Art

[0002] The operation for patients with aortic dissection is extremely dangerous. Without timely surgery, the mortality rate is extremely high. The currently relatively mature operation is the intraoperative stent implantation combined with the replacement of the 4-branch artificial blood vessel (i.e., the stent elephant trunk procedure, or the Sun's procedure). During this operation, the patient needs deep hypothermic circulatory arrest, and blood perfusion of the head is required during the circulatory arrest to prevent damage to key tissues and cause disability to the patient. Even when the best doctors perform the operation, the time for instrument suture is necessary, which results in many patients suffering from tissue and organ damage due to ischemia caused by too long circulatory arrest time.

[0003] Reducing the suture time has practical significance and is also a recognized feasible solution. In view of this situation, doctors and medical device researchers have come up with many methods. For example, a titanium ring and a ligature are used to tie the blood vessel connection site to achieve suture-free fixation. However, the problems with this method are as follows: 1) The titanium ring is not compressible, and after contacting the native blood vessel and under the action of the ligature, root cutting damage occurs to the native blood vessel. 2) The titanium ring is not compressible and cannot be released through a catheter, which increases the surgical operation difficulty and lengthens the operation time. 3) Under the action of hemodynamics, the titanium ring is prone to displacement, and the displaced support ring (titanium ring) is extremely likely to cause blood leakage or oozing. In addition, some doctors and scholars found that the intraoperative stent and the artificial blood vessel are pre-sewn together in advance, and a compressible support ring is placed inside the connection. During the operation, the support ring is tied to form a structure similar to a titanium ring, which solves the compression problem and the surgical installation problem, but does not solve the root cutting and displacement problems. Summary of the Invention

[0004] The present invention provides a constriction catheter for a support ring to solve the problems of root cutting or displacement existing in the existing support ring.

[0005] A constriction catheter for a support ring for receiving the support ring, comprising: a support ring body; and at least one anchoring member installed on the support ring body; wherein the anchoring member protrudes outside the support ring body, and the support ring body can radially contract or expand; A limiting groove matching with the anchoring member is formed at the front end of the constriction catheter, and the limiting groove communicates with the internal channel of the constriction catheter.

[0006] It further includes a fixing head. The fixing head is located inside the constriction catheter. A circular ear structure is provided on the support ring body, and a socket hole structure matching with the circular ear structure is provided on the fixing head.

[0007] The socket hole structure includes those provided on the fixed head: A convex part, which is matched with the central hole of the round ear structure; and A limiting member, which is arc-shaped and is matched with the outer shape of the round ear structure.

[0008] The limiting groove is a dovetail-shaped groove, the notch size of which is larger than the outer diameter of the anchor member, and the anchor member contacts the groove edge line of the limiting groove.

[0009] An arc chamfer is provided at the part where the limiting groove contacts the anchor member.

[0010] The included angle between the two sides of the limiting groove is α, and the included angle when the anchor member contacts one side is β. Among them, α is 20° - 30°, and β is 4° - 6°.

[0011] The number of the anchor members is multiple, and they are arranged circumferentially on the support ring main body.

[0012] The anchor member includes a tip and a blunt end. The blunt end is located inside the support ring main body, and the tip is located outside the support ring main body.

[0013] The support ring main body is a cylindrical mesh structure, and the material is nitinol, cobalt-chromium alloy or stainless steel.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: A plurality of limiting grooves corresponding to the plurality of anchor members are provided at the front end of the constricting catheter of the present invention. The plurality of limiting grooves are designed as dovetail-shaped grooves, and the size of the notch is larger than the outer diameter of the anchor member. Therefore, the anchor member has the freedom to move around the constricting catheter in the limiting groove, which is convenient for determining the position of the support ring when placing the support ring and realizes precise release; The included angle between the two sides of the limiting groove 7 is α, and the included angle when the anchor member contacts one side is β. Here, α is 20° - 30°, and β is 4° - 6°. The value of β increases as the value of α increases and decreases as the value of α decreases. In addition, an arc chamfer is provided at the part where the limiting groove contacts the anchor member. One is to increase the bearing capacity of the constricting catheter, and the other is to reduce the contact area between the anchor member and the limiting groove, so that the anchor member is in line contact with the limiting groove; Designing the contact position between the anchor member and the limiting groove as an arc shape can further reduce the contact area to point contact, thereby reducing the frictional resistance between the limiting groove and the support ring.

[0015] The contact part between the limiting groove and the anchor member is located at the root of the tip of the anchor member, so that the anchor member hardly deforms during compression, reducing the damage to the anchor member. Description of the Drawings

[0016] Figure 1 It is a schematic structural view of the support ring; Figure 2 It is a top view of the support ring; Figure 3 Partial cross-sectional view of the converging catheter; Figure 4 Schematic diagram of the connection structure of the support ring and the fixing head; Figure 5 Top view of the converging catheter of the present invention; Figure 6 Is Figure 5 Local enlarged view at position A of ; Figure 7 Schematic diagram of the structure after the support ring is released; Figure 8 Is Figure 7 Local enlarged view at position B of .

[0017] Explanation of reference numerals: 1. Support ring body; 2. Anchor; 3. Tip; 4. Blunt end; 5. Round ear structure; 6. Converging catheter; 7. Limit groove; 8. Fixing head; 9. Protrusion; 10. Limiting member; 11. Balloon; 12. Native blood vessel. Detailed implementation manners

[0018] The following combines the drawings to describe in detail a specific implementation manner of the present invention, but it should be understood that the protection scope of the present invention is not limited by the specific implementation manner. Embodiment

[0019] As Figures 1 to 8 shown, a converging catheter for a support ring provided in an embodiment of the present invention houses the support ring. The support ring includes a support ring body 1 and at least one anchor 2 provided on the support ring body 1. The anchor 2 and the support ring body 1 are of a split structure. In this embodiment, multiple anchors 2 are taken as an example, and the multiple anchors 2 are uniformly arranged on the support ring body 1 in the circumferential direction; a plurality of limit grooves 7 corresponding to the multiple anchors 2 one by one are opened at the front end of the converging catheter 6, and the plurality of limit grooves 7 communicate with the internal channel of the converging catheter 6. The limit groove 7 in this embodiment is designed as a dovetail-shaped groove, and the size of the groove opening is larger than the outer diameter of the anchor 2. Therefore, the anchor 2 has the freedom to move in the limit groove 7 with the converging catheter 6 as the center; The limit groove 7 does not penetrate the converging catheter 6, and a groove for docking with an operation control (connection tube) is opened at the rear of the converging catheter 6; In addition, it further includes a fixed head 8 which is connected to the support ring body. At least one circular ear structure 5 is arranged on the support ring body. The circular ear structure 5 is a ring structure. In this embodiment, three circular ear structures 5 are taken as an example. A socket hole structure corresponding to the three circular ear structures 5 one by one is arranged on the fixed head 8. Specifically, the socket hole structure includes a convex part 9 and a limiting member 10, and the two respectively cooperate with the central hole and the outer shape of the circular ear structure 5. A channel for accommodating the balloon 11 is provided at the center of the support ring body. After the balloon 11 is inflated and expanded, the circular ear structure 5 can also be separated from the socket hole structure, so as to complete the expansion and release of the support ring; As Figure 5 and Figure 6 shown, the included angle between the two side edges of the limiting groove 7 is α, and the included angle when the anchoring member 2 contacts one side is β. In this embodiment, α is 20° - 30°, and β is 4° - 6°. The value of β increases as the value of α increases and decreases as the value of α decreases. In addition, an arc chamfer is provided at the part where the limiting groove 7 contacts the anchoring member 2. One is to increase the bearing capacity of the converging catheter 6, and the other is to reduce the contact area between the anchoring member 2 and the limiting groove 7, so that the anchoring member 2 is in line contact with the limiting groove 7. If the position where the anchoring member 2 contacts the limiting groove 7 is designed to be arc-shaped, the contact area can be further reduced to point contact, thereby reducing the frictional resistance between the limiting groove 7 and the support ring; The converging catheter 6 in this embodiment is injection-molded with ABS, PC, PA, etc.; The support ring body 1 is a cylindrical mesh structure, specifically including a plurality of bracket units distributed circumferentially. Each bracket unit includes a plurality of sub-units distributed axially. The sub-units are quadrilaterals. In this embodiment, a rhombus is taken as an example, so that the support ring body 1 can contract or expand in its radial and axial directions; The material of the support ring body 1 in this embodiment is nitinol, cobalt-chromium alloy or stainless steel, and is shaped by cutting, with better compliance; The material of the anchoring member 2 in this embodiment is the same as above. It is fixedly connected to the support ring body by riveting. The anchoring member 2 has a tip 3 and a blunt end 4. The blunt end 4 is located inside the support ring body 1, and the tip 3 is located outside the support ring body 1. The shape of the blunt end 4 can be spherical, spherical crown-shaped, cylindrical, etc. In this embodiment, a sphere is taken as an example; When the support ring body 1 is loaded in the converging catheter 6, it is in a contracted state. Under the action of the expansion of the balloon 11, the support ring body 1 is expanded. The anchoring member 2 located on the support ring body 1 pierces into the blood vessel to realize the fixation of the support ring body 1 and avoid its displacement under the influence of blood flow; The expandable and contractible support ring body 1 can avoid root cutting damage to the native blood vessel 12.

[0020] According to actual requirements, the support ring with the anchor 2 is installed and compressed into the converging catheter 6 at the designed position. The specific compression process is as follows: "Fix one end of the converging catheter 6 to the connecting pipe. First, press the three circular ear structures 5 at the front end of the support ring into the three socket hole structures of the fixed head 8, and pull the support ring into the converging catheter 6 along the axial direction of the converging catheter 6. Connect the connecting pipe to the operating handle. The converging catheter 6 is connected to the control handle through the connecting pipe. By operating the handle, the release of the support ring can be achieved. The operating handle is a prior art, so it will not be elaborated here; The specific release process is as follows: "Send the support ring in the compressed state to the lesion site. The operating handle retracts the converging catheter 6 so that the support ring is completely unconstrained. Use the balloon 11 pressure pump to inflate the balloon 11. Driven by the balloon 11, the support ring expands outwards. Continue to inflate the balloon 11 according to the display of the pressure gauge until the balloon 11 pressure pump reaches the preset pressure, as Figure 7 and Figure 8 shown. At this time, the anchor 2 pierces into the native blood vessel 12. Release the pressure of the balloon 11 pressure pump. After the pressure release is completed, the operating handle withdraws the converging catheter 6 and all the rest to complete the release operation of the blood vessel support ring. The anchor 2 also plays a guiding role; If it is found that the position of the support ring is incorrect during the release process, the operating handle can retract the support ring into the converging catheter 6 and move it to the accurate position for release."

[0021] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit and basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0022] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A converging catheter for a support ring, characterized in that, For accommodating a support ring, the support ring comprising: A support ring body (1); and At least one anchoring member (2), mounted on the support ring body (1); Wherein, the anchoring member (2) protrudes outside the support ring body (1), and the support ring body (1) can radially contract or expand; The front end of the constricting catheter (6) is provided with a limiting groove (7) cooperating with the anchoring member (2), and the limiting groove (7) communicates with the internal channel of the constricting catheter (6).

2. The converging conduit of the support ring according to claim 1, characterized in that, It further includes a fixing head (8), the fixing head (8) is located inside the constricting catheter (6), a ring-shaped circular ear structure (5) is provided on the support ring body (1), and a socket structure cooperating with the circular ear structure (5) is provided on the fixing head (8).

3. The converging catheter of the support ring according to claim 2, characterized in that, The socket structure includes the following provided on the fixing head (8): A convex portion (9), cooperating with the central hole of the circular ear structure (5); and A limiting member (10), being arc-shaped, cooperating with the outer shape of the circular ear structure (5).

4. The converging catheter of the support ring according to claim 1, characterized in that, The limiting groove (7) is a dovetail-shaped groove, the groove opening size of which is larger than the outer diameter of the anchoring member (2), and the anchoring member (2) contacts the groove side line of the limiting groove (7).

5. The converging catheter of the support ring according to claim 4, characterized in that, An arc chamfer is provided at the portion where the limiting groove (7) contacts the anchoring member (2).

6. The converging conduit of the support ring according to claim 5, characterized in that, The included angle between the two sides of the limiting groove (7) is α, and the included angle when the anchoring member (2) contacts one side is β, wherein, α is 20° - 30°, and β is 4° - 6°.

7. The constricting catheter of the support ring according to claim 1, characterized in that, The number of the anchoring members (2) is multiple, and they are circumferentially arranged on the support ring body (1).

8. The converging catheter of the support ring according to claim 1, characterized in that, The anchoring member (2) includes a tip (3) and a blunt end (4), the blunt end (4) is located inside the support ring body (1), and the tip (3) is located outside the support ring body (1).

9. The converging catheter of the support ring according to claim 1, characterized in that, The support ring body (1) is a cylindrical mesh structure, and the material is nitinol, cobalt-chromium alloy or stainless steel.

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