Large-area contact type threaded degradable magnesium alloy aortic vessel anastomat

Abstract

The utility model relates to a large area contact type thread type degradable magnesium alloy aortic blood vessel anastomat, including the conical inner ring, conical outer ring and sleeve outer ring that set gradually from inside to outside, be provided with blood vessel clamping space between the conical inner ring and conical outer ring, it is the thread cooperation between conical outer ring and sleeve outer ring, adjust the size of blood vessel clamping space through the rotation sleeve outer ring, sleeve outer ring. The utility model simple structure, reasonable in design, convenient to use, adjust the size of blood vessel clamping space through the rotation conical outer ring and sleeve outer ring to fixed blood vessel, realize blood vessel anastomosis fast, avoid the mode of the traditional everted type through end face combination simultaneously, greatly increase the contact area between blood vessel and prevent the occurrence of blood leakage.

Description

Technical Field

[0001] This utility model relates to a large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device. Background Technology

[0002] Cardiovascular diseases are becoming increasingly common with an aging population. Vascular anastomosis is a crucial step in treating cardiovascular diseases, and its speed, precision, and reliability all affect the patient's postoperative recovery. For a long time, medical professionals have used sutures for vascular anastomosis because of their high applicability and reliability. However, suture suturing requires a high level of surgical skill and is a complex and time-consuming procedure; furthermore, suture suturing is highly likely to damage the vessel wall, which is detrimental to the patient's postoperative recovery.

[0003] With the development of technology, the methods of vascular anastomosis have become more diversified. Currently, methods such as bio-adhesive bonding, laser and high-frequency electrocoagulation thermal welding, and vascular anastomosis devices have emerged. Although these methods have simplified the vascular anastomosis process and reduced the difficulty of operation, there are still many problems. For example, although bio-adhesive eliminates the need for sutures and reduces the risk of complications, its reliability and stability still need to be verified and are highly uncertain. Although thermal welding technology is efficient and fast, the welding temperature must be controlled during operation, otherwise it may cause irreversible thermal damage to the vascular tissue, posing a safety hazard. Against this backdrop, precisely designed mechanical anastomosis devices have emerged as a promising candidate to overcome the limitations of existing technologies due to their significant advantages of speed, safety, reliability, and ease of operation. However, current traditional vascular anastomosis devices suffer from unreasonable construction. Some are made of non-degradable metals, which prevents patients from undergoing postoperative examinations such as CT and MRI. Other devices use puncture-type connections, which can damage the vessel walls and affect postoperative recovery. Non-puncture anastomosis devices often have insufficient contact area between vessels, leading to blood leakage when used in major vessels like the aorta. This invention avoids these disadvantages by using a biodegradable magnesium alloy and a threaded connection to prevent damage to vessels caused by traditional puncture-type anastomosis devices, while also increasing the contact area between vessels to prevent the risk of blood leakage. Utility Model Content

[0004] This invention addresses the aforementioned problems by providing a large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device, which is simple in structure and easy to use.

[0005] This utility model is constructed as follows: it includes a conical inner ring, a conical outer ring, and a sleeve outer ring arranged sequentially from the inside to the outside. A blood vessel clamping space is provided between the conical inner ring and the conical outer ring. The conical outer ring and the sleeve outer ring are threaded together. The size of the blood vessel clamping space can be adjusted by rotating the sleeve outer ring and the sleeve outer ring.

[0006] Furthermore, the outer wall of the conical inner ring and the inner wall of the conical outer ring are conical surfaces.

[0007] Furthermore, the outer surface of the tapered outer ring is provided with an external thread protrusion, and the inner surface of the sleeve outer ring is provided with an internal thread groove, wherein the external thread protrusion and the internal thread groove are threadedly engaged.

[0008] Furthermore, the outer ring of the sleeve includes a sleeve and an annular base plate, with a through hole in the center of the annular base plate, and the sleeve and the annular base plate are integrally formed.

[0009] Furthermore, multiple limiting holes are provided on the annular base plate of the outer sleeve and on the end face of the conical outer ring.

[0010] Furthermore, the conical inner ring, the conical outer ring, and the sleeve outer ring are coaxially arranged.

[0011] Furthermore, the conical inner ring has a conical inner ring through hole in the middle, and the outer surface of the conical inner ring is the outer conical surface of the conical inner ring.

[0012] Furthermore, the conical outer ring has a conical outer ring through hole in the middle, and the inner wall of the conical outer ring has a conical outer ring inner conical surface.

[0013] Furthermore, both the conical outer ring and the sleeve outer ring are limited in rotation using specially designed pliers. The specially designed pliers include a first plier body and a second plier body. The upper parts of the first plier body and the second plier body are rotatably connected via hinges. The upper parts of the first plier body and the second plier body are each provided with a semi-circular bend. The interior of the semi-circular bend forms a semi-circular groove. The openings of the two semi-circular grooves are arranged opposite each other and can be closed to form a circular hole. The lower outer sides of the first plier body and the second plier body are each provided with a first handle. Multiple positioning pins are provided on the side of the semi-circular bend. The positioning pins cooperate with the limiting holes of the sleeve outer ring and the conical outer ring.

[0014] Furthermore, the conical inner ring, conical outer ring, and sleeve outer ring are all made of magnesium alloy.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model involves passing a blood vessel through the inner ring of a conical inner ring and then folding it over the outer conical surface of the inner ring. An expander is then used to open another blood vessel and place it over the folded vessel, allowing the inner walls of the two vessels to contact and anastomose. This ensures a large contact area between the two vessels, resulting in a tighter anastomosis and preventing blood leakage. By rotating the outer conical ring and the outer sleeve ring, the distance between the outer and inner conical surfaces of the inner and outer rings is changed, adjusting the clamping space and controlling the degree of compression between the vessels to achieve anastomosis. The vascular anastomosis device of this utility model uses a large-area contact threaded biodegradable magnesium alloy design. This innovative design simplifies the vascular suturing steps in cardiovascular surgery, making the anastomosis stage simpler and faster. Medical personnel can operate it without extensive training, while preventing damage to blood vessels caused by traditional sutures.

[0017] 2. This utility model has a limiting hole on the conical outer ring and the annular base plate of the sleeve outer ring. By operating a specially designed hand pliers, medical staff can easily assemble the stapler in a confined space.

[0018] 3. The vascular anastomosis device of this utility model uses magnesium alloy as the material, which can be naturally degraded in the human body and will not have a long-term impact on the inner diameter of blood vessels, thus inhibiting the risk of thrombosis caused by the use of the anastomosis device by the patient; in addition, magnesium is an essential element that the human body cannot produce, and the magnesium required by the human body can be supplemented during the degradation process of magnesium alloy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of the present utility model;

[0021] Figure 3 This is a perspective view of the conical inner ring according to an embodiment of the present invention;

[0022] Figure 4 This is a sectional view of the conical inner ring of an embodiment of the present invention;

[0023] Figure 5 This is a perspective view of the conical outer ring according to an embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional view of the tapered outer ring of an embodiment of the present invention;

[0025] Figure 7 This is a side view of the conical outer ring according to an embodiment of the present invention;

[0026] Figure 8This is a perspective view of the outer ring of the sleeve in an embodiment of the present utility model;

[0027] Figure 9 This is a sectional view of the outer ring of the sleeve in an embodiment of this utility model;

[0028] Figure 10 This is a side view of the outer ring of the sleeve in an embodiment of the present utility model;

[0029] Figure 11 This is a schematic diagram of the blood vessel connection structure at both ends in an embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram illustrating the connection and fit between the specially made hand pliers and the outer ring of the sleeve in an embodiment of this utility model;

[0031] Figure 13 This is a schematic diagram of a specially made pair of pliers structure according to an embodiment of the present utility model;

[0032] Figure 14 This is a schematic diagram illustrating the operation of an embodiment of the present utility model. Figure 1 (The two blood vessels pass through the conical outer ring and the sleeve outer ring, respectively.)

[0033] Figure 15 This is a schematic diagram illustrating the operation of an embodiment of the present utility model. Figure 2 (Two segments of blood vessels anastomosed with the conical inner ring);

[0034] Figure 16 This is a schematic diagram illustrating the operation of an embodiment of the present utility model. Figure 3 (Use pliers to tighten the stapler);

[0035] Figure 17 This is a cross-sectional view of the blood vessels and the anastomosis device after degradation of the magnesium alloy anastomosis device according to an embodiment of this utility model (dashed lines represent the degraded anastomosis device).

[0036] Figure 18 This is a schematic diagram of the initial corrosion of the magnesium alloy stapler in an embodiment of the present invention (small corrosion pits appear on the surface of the stapler).

[0037] Figure 19 This is a schematic diagram of mid-term corrosion of the magnesium alloy stapler according to an embodiment of the present invention (the pits on the surface of the stapler gradually expand). Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] Example: Refer to Appendix Figure 1-19As shown, a large-area contact threaded biodegradable magnesium alloy aortic anastomosis device is provided, comprising a conical inner ring 1, a conical outer ring 2, and a sleeve outer ring 3 arranged sequentially from the inside to the outside. The conical inner ring, conical outer ring, and sleeve outer ring are coaxially arranged, and a vascular clamping space 4 is provided between the conical inner ring and the conical outer ring. The outer wall of the conical inner ring and the inner wall of the conical outer ring are conical surfaces, and the vascular clamping space is located between the two conical surfaces. The conical outer ring and the sleeve outer ring are threadedly fitted. The size of the vascular clamping space can be adjusted by rotating the sleeve outer ring, that is, by changing the distance between the conical inner ring and the conical outer ring, the clamping and fixing function of the blood vessel 5 can be achieved. This device is mainly used in aortic suturing in cardiovascular surgical procedures.

[0040] In this embodiment of the present invention, the conical inner ring 1 has a conical inner ring through hole 101 in the middle, and the outer surface of the conical inner ring is a conical outer conical surface 102; the included angle between the conical outer conical surface and the central axis can be 10°.

[0041] In this embodiment of the present invention, the conical outer ring 2 is provided with a conical outer ring through hole 201 in the middle, and the inner wall of the conical outer ring is provided with a conical outer ring inner conical surface 202; the conical angle of the conical outer ring inner conical surface and the conical inner ring outer conical surface is the same, and the included angle between the conical outer ring inner conical surface and the central axis can also be 10°.

[0042] In this embodiment of the utility model, the outer surface of the tapered outer ring 2 is provided with an external thread protrusion 203, which is the external thread portion. The inner surface of the sleeve outer ring 3 is provided with an internal thread groove 301, which is the internal thread portion that mates with the external thread portion. The external thread protrusion and the internal thread groove are threadedly engaged.

[0043] The external thread of the tapered outer ring has a low protrusion angle, thus enabling the thread to self-lock and prevent loosening during the tightening of the connector.

[0044] In this embodiment of the invention, the outer sleeve ring 3 includes a sleeve 302 and an annular base plate 303. The center of the annular base plate has a base plate through hole 304. The sleeve and the annular base plate are integrally formed. The size of the base plate through hole of the annular base plate corresponds to the size of the conical inner ring through hole of the conical inner ring. During the fitting process, the annular base plate will contact the conical inner ring. By rotating the conical outer ring and the outer sleeve ring, the distance between the conical inner ring and the conical outer ring can be controlled, thereby achieving anastomosis and fixation of the blood vessel.

[0045] In this embodiment of the utility model, multiple limiting holes 305 are provided on the annular base plate of the outer sleeve and the end face of the conical outer ring.

[0046] In this embodiment of the utility model, both the conical outer ring and the sleeve outer ring are limited and rotated using a special hand clamp 6. The special hand clamp 6 includes a first clamp body 601 and a second clamp body 602. The upper parts of the first clamp body and the second clamp body are rotatably engaged by a hinge 603. The hinge can be a pin, bolt, or screw. The upper parts of the first clamp body and the second clamp body are each provided with a semi-circular bending portion 604. A semi-circular groove 605 is formed inside the semi-circular bending portion. The openings of the two semi-circular grooves are arranged opposite each other and can be closed to form a circular hole. The lower outer parts of the first clamp body and the second clamp body are each provided with a first handle 606. The first handle can be in the form of a closed ring. Multiple positioning pins 607 are provided on the side of the semi-circular bending portion. The positioning pins cooperate with the limiting holes 305 of the sleeve outer ring and the limiting holes 305 of the conical outer ring, which facilitates the tightening of the stapler by medical personnel.

[0047] When using the special hand clamp, the positioning pin of the special hand clamp is inserted into the limiting hole of the outer sleeve ring and the limiting hole of the conical outer ring. Then, according to the usage requirements, the special hand clamp is rotated to control the rotation of the outer sleeve ring and the conical outer ring, thereby changing the size of the blood vessel clamping space.

[0048] Using specially designed pliers allows medical staff to easily assemble the stapler in confined spaces.

[0049] In this embodiment of the invention, the conical inner ring, the conical outer ring, and the sleeve outer ring are all made of magnesium alloy. Magnesium alloy is a biodegradable material, which, compared to stainless steel and titanium alloy, can degrade on its own in the human body, avoiding the risk of thrombosis caused by the anastomosis device. At the same time, magnesium is an essential trace element for the human body and will not have any impact on the human body during the degradation process.

[0050] In this embodiment of the invention, the conical inner ring, the conical outer ring, and the sleeve outer ring are all provided with rounded corners at the joints between their surfaces; the rounded corners ensure that the anastomosis device will not cause rupture damage to blood vessels during operation.

[0051] In this embodiment of the utility model, the usage steps are as follows:

[0052] Step one: First, pass the two blood vessels through the conical outer ring and the sleeve outer ring respectively;

[0053] Step 2: After passing a section of blood vessel through the inner wall 103 of the conical inner ring, it is then everted over the outer conical surface of the conical inner ring. Subsequently, an expander is used to open another section of blood vessel and place it over the everted blood vessel, so that the inner walls of the two sections of blood vessel come into contact and fit together. At the same time, it can also ensure that the two ends of the blood vessels have a large contact area to better prevent blood leakage.

[0054] Step 3: Use special pliers to limit the conical outer ring and conical inner ring, and then tighten the conical outer ring and the sleeve outer ring. The distance of the blood vessel clamping space is adjusted by the interlocking threads of the conical outer ring and the sleeve outer ring, thereby controlling the degree of compression between blood vessels.

[0055] In this embodiment of the invention, the device fixes a blood vessel through the inner wall of the conical inner ring and outwards onto the outer conical surface of the conical inner ring. Another blood vessel is expanded by an expander and then covers the outwardly turned inner wall of the blood vessel, thus achieving anastomosis between the inner walls of the blood vessels. Since the cross-section of the blood vessel is not a complete thin-walled circular ring, its thickness varies in various aspects. Therefore, the anastomosis method of this device can increase the contact area, making the blood vessel anastomosis tighter and preventing the risk of blood vessel leakage due to insufficient contact area.

[0056] This device controls the distance between the outer conical surface of the inner conical ring and the inner conical surface of the outer conical ring by using a helical feeding method with a conical outer ring and a sleeve outer ring. This alters the size of the vascular clamping space, thereby generating pressure on the blood vessel to achieve anastomosis. The single inner ring design effectively increases the contact area between the two blood vessel segments, avoiding the risk of blood leakage due to insufficient contact area. Furthermore, the use of magnesium alloy as the material allows the stapler to degrade naturally in the human body while ensuring that the degradation products do not cause harm to the body.

[0057] Unless otherwise stated, if any technical solution disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solution of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0058] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0059] Meanwhile, if the present invention discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, the mutually fixed connection can also be replaced by an integral structure (e.g., manufactured by casting process) (except where it is obviously impossible to use an integral forming process).

[0060] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0061] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device, characterized in that, It includes a conical inner ring, a conical outer ring, and a sleeve outer ring arranged sequentially from the inside to the outside. A vascular clamping space is provided between the conical inner ring and the conical outer ring. The conical outer ring and the sleeve outer ring are threaded together. The size of the vascular clamping space can be adjusted by rotating the sleeve outer ring and the sleeve outer ring. The outer wall of the conical inner ring and the inner wall of the conical outer ring are conical surfaces.

2. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The outer surface of the tapered outer ring is provided with an external thread protrusion, and the inner surface of the sleeve outer ring is provided with an internal thread groove. The external thread protrusion and the internal thread groove are threadedly engaged.

3. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The outer ring of the sleeve includes a sleeve and an annular base plate. The center of the annular base plate is a through hole. The sleeve and the annular base plate are integral.

4. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, Multiple limiting holes are provided on the annular base plate of the outer sleeve and on the end face of the conical outer ring.

5. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The conical inner ring, conical outer ring, and sleeve outer ring are coaxially arranged.

6. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The conical inner ring has a conical inner ring through hole in the middle, and the outer surface of the conical inner ring is the outer conical surface of the conical inner ring.

7. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The conical outer ring has a conical outer ring through hole in the middle, and the inner wall of the conical outer ring has a conical outer ring inner conical surface.

8. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, Both the conical outer ring and the sleeve outer ring are limited and rotated using specially made pliers. The specially made pliers include a first plier body and a second plier body. The upper parts of the first plier body and the second plier body are rotatably engaged by a hinge. The upper parts of the first plier body and the second plier body are provided with a semi-circular bend. The semi-circular bend forms a semi-circular groove inside. The openings of the two semi-circular grooves are arranged opposite each other and can be closed to form a circular hole. The lower outer sides of the first plier body and the second plier body are provided with a first handle. Multiple positioning pins are provided on the side of the semi-circular bend. The positioning pins are engaged with the limiting holes of the sleeve outer ring and the conical outer ring.

9. The large-area contact type threaded biodegradable magnesium alloy aortic anastomosis device according to claim 1, characterized in that, The conical inner ring, conical outer ring, and sleeve outer ring are all made of magnesium alloy.

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