Recoverable large vessel covered stent for medical first aid

Abstract

The invention discloses a recyclable large vessel covered stent for medical first aid, and relates to the technical field of medical instruments. Comprising a support main body which is telescopic; the PTFE covering film covers the outer surface of the stent main body and is used for temporarily blocking and isolating crevasses of large blood vessels or perfusion blood vessels of broken visceral organs; the recovery traction mechanism comprises a traction guide wire close to the near end of the stent main body; the stent recycling sheathing canal is used for being placed along the traction guide wire when needed so as to recycle the temporarily placed stent main body; and the fixed traction piece is mounted in the stent recovery sheath tube, is in contact with the near end of the stent main body and is used for being matched with the stent recovery sheath tube to recover the temporary stent main body from the blood vessel. The covered stent can be rapidly placed in the aorta through a vascular intracavity technology under ultrasonic guidance on a treatment site, and a blood vessel crevasse or a broken bleeding organ blood supply vessel is temporarily sealed, so that the rapid hemostasis effect is achieved, and time is won for treatment of a patient.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a recyclable large blood vessel covered stent for medical emergency. Background Art

[0002] At present, acute large vessel rupture or internal organ rupture bleeding caused by severe trauma is an extremely dangerous condition. Patients may suffer from hemorrhagic shock in a short period of time, which is life-threatening. Rapid control of bleeding is the key to treating such patients. However, during first aid at the trauma site, the conditions for open exploratory hemostasis surgery are often not available, resulting in difficulties in treating patients with hemorrhagic shock and a very high mortality rate. Most of the existing large vessel covered stents are designed for permanent implantation, which not only cannot meet the needs of temporary hemostasis, but also are complicated to operate and rely on radiological technology DSA for guidance, which increases the difficulty and risk of treatment. Summary of the invention

[0003] To solve the above problems, the present invention provides a recyclable large blood vessel covered stent for medical emergency. The stent has the advantages of simple structure, convenient operation, rapid hemostasis and recyclability. It is suitable for emergency treatment of severe traumatic large blood vessel rupture or internal organ rupture and bleeding.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention is a recyclable large blood vessel covered stent for medical emergency, comprising:

[0006] A support body, wherein the support body is retractable;

[0007] The PTFE coating covering the outer surface of the stent body is used to temporarily block and isolate the rupture of large blood vessels or the perfusion blood vessels of ruptured internal organs;

[0008] A recovery and pulling mechanism, the recovery and pulling mechanism comprising:

[0009] a traction guidewire proximal to the proximal end of the stent body;

[0010] The stent retrieval sheath is used to be placed along the traction guidewire when necessary to retrieve the temporarily placed stent body;

[0011] A fixed pulling piece installed in the stent retrieval sheath contacts the proximal end of the stent body and is used to cooperate with the stent retrieval sheath to retrieve the temporary stent body from the blood vessel.

[0012] As a preferred technical solution of the present invention, the proximal end of the stent body is gradually closed, and a collection ring is provided at the distal end of the proximal end of the stent body.

[0013] As a preferred technical solution of the present invention, the traction guide wire includes a positioning ring and a guide wire arranged on one side of the positioning ring.

[0014] As a preferred technical solution of the present invention, a card is provided on the outer surface of the inner ring of the positioning ring near the guide wire, the fixed pulling member is a clamping tube, the clamping tube is located inside the stent recovery sheath and is sleeved outside the guide wire, the diameter of the positioning ring is between the diameter of the retrieval ring and the diameter of the stent body; the diameter of the clamping tube is smaller than the retrieval ring.

[0015] As a preferred technical solution of the present invention, the stent retrieval sheath includes a main tube and a secondary tube fixedly installed on one side of the main tube, the secondary tube is sleeved outside the traction guide wire, and the end of the main tube close to the stent body is provided with a trumpet opening outward.

[0016] As a preferred technical solution of the present invention, the fixed pulling member includes a pulling wire and an elastic claw hook located at the head of the pulling wire.

[0017] As a preferred technical solution of the present invention, the elastic claw hook is provided with three or more hooks.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides significant beneficial effects for the emergency treatment of severe traumatic large blood vessel rupture or internal organ rupture bleeding. This technical solution achieves rapid and accurate occlusion of large blood vessel rupture or perfusion vessels of ruptured internal organs at the treatment site by designing a recyclable nickel-titanium alloy stent combined with a PTFE coating, effectively controlling bleeding and buying precious treatment time for patients. Compared with traditional permanent implanted stents, the coated stent can be completely recovered after the open exploratory hemostasis surgery is completed, reducing the long-term impact on the patient's body.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the stent body of the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the traction guide wire in the present invention;

[0026] Figure 5 This is a schematic diagram of the installation structure of the fixed pulling member in the second embodiment of the present invention;

[0027] Figure 6 for Figure 5 Schematic diagram of the internal structure;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the stent recovery sheath tube of Example 2 of the present invention;

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1-stent body, 11-collecting ring; 2-recovery and pulling mechanism, 21-positioning ring, 22-card, 23-guide wire, 24-positioning tube, 25-main tube, 26-secondary tube, 27-pulling wire, 28-elastic claw hook, 29-trumpet. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] Embodiment 1

[0034] like Figure 1 , Figure 3 and Figure 4As shown: a recyclable large blood vessel covered stent for medical emergency, comprising: a stent body 1, the stent body 1 is retractable; a PTFE coating covering the outer surface of the stent body 1, used to temporarily block and isolate the rupture of the large blood vessel or the perfusion blood vessel of the ruptured internal organs; a retrieving and pulling mechanism 2, the retrieving and pulling mechanism 2 comprising: a pulling guide wire close to the proximal end of the stent body 1; a stent retrieving sheath tube used to be placed along the pulling guide wire when needed to retrieve the temporarily placed stent body 1;

[0035] A fixed pulling member installed in the stent recovery sheath, the fixed pulling member contacts the proximal end of the stent body 1, and is used to cooperate with the stent recovery sheath to recover the temporary stent body 1 from the blood vessel. The proximal end of the stent body 1 gradually closes, and a collection ring 11 is provided at the end of the proximal end of the stent body 1. The traction guidewire includes a positioning ring 21 and a guidewire 23 provided on one side of the positioning ring 21. A card 22 is provided on the outer surface of the inner ring of the positioning ring 21 near the guidewire 23. The fixed pulling member is a clamping tube 24, which is located inside the stent recovery sheath and is sleeved outside the guidewire 23. The diameter of the positioning ring 21 is between the diameter of the collection ring 11 and the diameter of the stent body 1; the diameter of the clamping tube 24 is smaller than the collection ring 11.

[0036] This embodiment shows the specific structure and operation of a recyclable large vessel covered stent for medical emergency. The stent is intended to be used to temporarily block and isolate large vessel ruptures or perfusion vessels of ruptured internal organs caused by severe trauma, so as to achieve rapid hemostasis and buy time for further treatment of the patient.

[0037] like Figure 1 , Figure 3 and Figure 4 As shown, the retrievable large blood vessel covered stent for medical emergency mainly consists of the following parts:

[0038] The stent body 1 is scalable to meet the requirements of different blood vessel diameters. The proximal end of the stent body 1 is gradually closed, and a collection ring 11 is provided at the end of the proximal end to facilitate subsequent recovery operations.

[0039] PTFE coating: covers the outer surface of the stent body 1 and is used to temporarily block and isolate the rupture of large blood vessels or the perfusion blood vessels of ruptured internal organs; PTFE material is selected because of its good biocompatibility and corrosion resistance.

[0040] Retrieval and pulling mechanism 2: including a pulling guidewire and a stent retrieval sheath;

[0041] Traction guidewire: It is composed of a positioning ring 21 and a guidewire 23 arranged on one side of the positioning ring 21. A card 22 is arranged on the outer surface of the inner ring of the positioning ring 21 near the guidewire 23 to fix the position of the stent in the blood vessel;

[0042] Stent retrieval sheath: used to be placed along the traction guidewire when necessary to retrieve the temporarily placed stent body 1;

[0043] The fixed pulling member is a positioning tube 24, which is located inside the stent recovery sheath and sleeved outside the guide wire 23. The diameter of the positioning tube 24 is smaller than the collection ring 11, and is used to cooperate with the stent recovery sheath to retrieve the temporary stent body 1 from the blood vessel;

[0044] The specific working principle and operation steps are as follows:

[0045] Preparation: Deliver the covered stent into the target blood vessel through the vascular sheath and adjust it to the accurate position under ultrasound guidance;

[0046] Release the stent: by controlling the guidewire and the stent recovery sheath, the stent body 1 is released and deployed at the target position to fully cover the vascular rupture or perfuse the blood vessel;

[0047] Hemostasis operation: The PTFE coating adheres closely to the blood vessel wall, forming a temporary blockage, isolating blood flow and achieving the purpose of rapid hemostasis;

[0048] Retrieve the stent (after the open exploratory hemostasis surgery is completed):

[0049] First, make the positioning ring 21 of the traction guidewire contact with the proximal end of the stent body, then insert the stent recovery sheath along the traction guidewire, and then fix the recovery ring 11 by the cooperation of the clamping tube 24 and the card 22 on the positioning ring 21; by pulling the guidewire, the stent body 1 is gradually recovered from the blood vessel into the sheath, and finally completely withdrawn from the body.

[0050] This embodiment has the following significant advantages:

[0051] Rapid hemostasis: Through intravascular technology, the covered stent can be quickly inserted under ultrasound guidance at the scene of treatment to achieve temporary hemostasis and buy time for patient treatment.

[0052] Fully retrievable: After the open exploratory hemostasis surgery is completed, it can be completely retrievable through the stent retrieval device, avoiding the potential risks of permanent implantation.

[0053] Easy to operate: The structure is reasonably designed and the retracting mechanism is easy to operate, which reduces the difficulty and risk of surgery.

[0054] Improve the success rate of treatment: As one of the important measures for on-site treatment of severe trauma, it can effectively improve the success rate of treatment of severe visceral bleeding and save patients' lives.

[0055] Embodiment 2

[0056] Based on the first embodiment, the difference of this embodiment is that:

[0057] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown: the stent recovery sheath comprises a main tube 25 and a secondary tube 26 fixedly mounted on one side of the main tube 25, the secondary tube 26 is sleeved outside the guide wire 23, and a trumpet 29 opening outward is provided at the end of the main tube 25 close to the stent body 1. The fixed pulling member comprises a pulling wire 27 and an elastic claw hook 28 located at the head of the pulling wire 27. The elastic claw hook 28 is provided with three or more hooks.

[0058] This embodiment is further improved on the basis of the first embodiment, mainly optimizing the structure of the stent recovery sheath to improve the stability and efficiency of the recovery process.

[0059] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the stent retrieval sheath in this embodiment includes a main tube 25 and a secondary tube 26 fixedly installed on one side of the main tube 25. The secondary tube 26 is cleverly sleeved on the outside of the guide wire 23 (or called the traction guide wire). This design not only protects the guide wire from damage during the retrieval process, but also ensures the relative position stability between the sheath and the guide wire.

[0060] The end of the main tube 25 close to the stent body 1 is provided with a bell mouth 29 opening outward. The innovative point of this design is that the bell mouth 29 enables the sheath tube to more easily guide the stent body 1 into the inside of the sheath tube when the stent body 1 is recovered, thereby reducing the resistance and friction during the recovery process and improving the recovery efficiency.

[0061] In addition, this embodiment also introduces a new structure for fixing the pulling member, including a pulling wire 27 and an elastic claw hook 28 located at the head of the pulling wire 27. The elastic claw hook 28 is specially provided with three or more hooks, which can firmly grasp the collection ring 11 on the proximal end of the stent body 1 during the recovery process, ensuring that the stent will not fall off or shift during the recovery process.

[0062] In actual operation, when the stent body 1 needs to be recovered, the stent recovery sheath is first guided to the proximal end of the stent body 1 by manipulating the traction guide wire (guide wire 23). Subsequently, the elastic claw hook 28 is pushed to the vicinity of the stent body 1 by the pulling wire 27, and the hook is firmly hooked on the stent collection ring 11. Then, by slowly pulling the pulling wire 27, the elastic claw hook 28 drives the stent body 1 to move in the direction of the recovery sheath. Due to the guiding effect of the bell mouth 29, the stent body 1 can smoothly enter the sheath, and finally complete the recovery process.

[0063] This improved stent retrieval sheath and fixed traction piece structure not only improves the stability and efficiency of the retrieval process, but also reduces the difficulty and risk of operation, providing more reliable technical support for medical emergency work.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A recyclable large blood vessel covered stent for medical emergency, characterized in that: include: A support body (1), wherein the support body (1) is retractable; The PTFE coating covering the outer surface of the stent body (1) is used to temporarily block and isolate the rupture of large blood vessels or the perfusion blood vessels of ruptured internal organs; A recovery and pulling mechanism (2), wherein the recovery and pulling mechanism (2) comprises: A traction guide wire close to the proximal end of the stent body (1); The stent retrieval sheath is used to be placed along the traction guidewire when necessary to retrieve the temporarily placed stent body (1); A fixed pulling piece installed in the stent retrieval sheath, the fixed pulling piece contacts the proximal end of the stent body (1), and is used to cooperate with the stent retrieval sheath to retrieve the temporary stent body (1) from the blood vessel.

2. The recyclable large blood vessel covered stent for medical emergency use according to claim 1, characterized in that: The proximal end of the stent body (1) gradually closes, and a collecting ring (11) is provided at the distal end of the proximal end of the stent body (1).

3. The recyclable large blood vessel covered stent for medical emergency use according to claim 2, characterized in that: The traction guidewire comprises a positioning ring (21) and a guidewire (23) arranged on one side of the positioning ring (21).

4. The recyclable large blood vessel covered stent for medical emergency use according to claim 3, characterized in that: A card (22) is provided on the outer surface of the inner ring of the positioning ring (21) near the guide wire (23); the fixed pulling member is a positioning tube (24); the positioning tube (24) is located inside the stent recovery sheath and is sleeved outside the guide wire (23); the diameter of the positioning ring (21) is between the diameter of the retrieval ring (11) and the diameter of the stent body (1); the diameter of the positioning tube (24) is smaller than the diameter of the retrieval ring (11).

5. The recyclable large blood vessel covered stent for medical emergency use according to claim 3, characterized in that: The stent recovery sheath comprises a main tube (25) and a secondary tube (26) fixedly mounted on one side of the main tube (25); the secondary tube (26) is sleeved outside the guide wire (23); and a bell mouth (29) opening outward is provided at the end of the main tube (25) close to the stent body (1).

6. The recyclable large blood vessel covered stent for medical emergency use according to claim 5, characterized in that: The fixed pulling member comprises a pulling wire (27) and an elastic claw hook (28) located at the head of the pulling wire (27).

7. The recyclable large blood vessel covered stent for medical emergency use according to claim 6, characterized in that: The elastic claw hook (28) is provided with three or more hooks.

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