Absorbable vein anastomosis auxiliary device

Abstract

The invention relates to an absorbable vein anastomosis auxiliary device which comprises an inner sleeve and two semi-circle segments, the inner wall of the inner sleeve is smooth, the outer wall of the inner sleeve is rough, and the inner sleeve is used for butt joint of the ends of two sections of vein blood vessels to be anastomosed; the inner wall and the outer wall of each half-cycle segment are rough, and the two half-cycle segments are used for clamping and fixing the overlapped and butted parts of two sections of vein blood vessels from the outside; wherein the inner sleeve and the semi-circle pipe piece are both made of degradable absorbing materials. By means of a mechanical anastomosis mode, the anastomosis time can be greatly shortened, meanwhile, due to uniform operation, the occurrence rate of vascular related complications can be reduced, the learning curve of surgeons is shortened, the operation time is greatly shortened, the operation effect is improved, and the operation risk is reduced.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to an absorbable venous anastomosis auxiliary device. Background Art

[0002] Currently, during surgical operations, venous anastomosis is performed using needle and thread suturing technology, which often takes a long time. In addition, due to differences in suturing skills and experience among surgeons, complications such as anastomotic stenosis, thrombosis, and bleeding may occur with varying probabilities after anastomosis, leading to poor prognosis for patients. Summary of the invention

[0003] The purpose of the present invention is to provide an absorbable venous anastomosis auxiliary device to solve the above problems.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An absorbable venous anastomosis assist device may include:

[0006] An inner sleeve, wherein the inner wall of the inner sleeve is smooth and the outer wall is rough, and the inner sleeve is used to butt joint the ends of two sections of venous blood vessels to be anastomosed; and

[0007] Two semi-circumferential segments, both inner and outer walls of the semi-circumferential segments are rough, and the two semi-circumferential segments are used to clamp and fix the overlapping butt joint parts of two sections of venous blood vessels from the outside;

[0008] Wherein, the inner sleeve and the semi-circumferential tube segment are both made of degradable absorbent material.

[0009] In one embodiment, the outer wall of the inner sleeve and the inner and outer walls of the semi-circumferential tube segment both have regular textures.

[0010] In one embodiment, a plurality of radially extending fixing ears are provided at both circumferential ends of the semi-circumferential tube segment.

[0011] In one embodiment, two circumferential ends of the two semi-circumferential segments are provided with clamping structures that butt against each other.

[0012] In one embodiment, the snap-fit ​​structure includes a plurality of snap-fit ​​grooves and a plurality of snap-fit ​​buckles, wherein the snap-fit ​​grooves and the snap-fit ​​buckles are respectively arranged on two butted circumferential ends or are arranged at intervals on the same circumferential end.

[0013] In one embodiment, one end of the two semi-circumferential tube segments is pivotally connected so that the two semi-circumferential tube segments can rotate relative to each other to achieve opening and closing.

[0014] In one embodiment, one of the semi-circumferential segments is pre-embedded with a plurality of sutures extending circumferentially to predetermined lengths at both ends, and the other semi-circumferential segment is pre-embedded with corresponding suture rings at both circumferential ends.

[0015] In one embodiment, the inner sleeve has a wall thickness of 0.3 to 1.0 mm and a length of 1.0 to 3.0 cm.

[0016] In one embodiment, the outer wall of the semi-circumferential tube segment is provided with a plurality of circumferentially extending grooves.

[0017] In one embodiment, the degradable absorbent material includes polylactic acid-co-glycolic acid, polylactic acid, poly(L-lactic acid), polycaprolactone, polyanhydride, polycarbonate, polyhydroxyalkyl methacrylate, keratin, silk fibroin, collagen, cellulose, chitin and chitosan.

[0018] In one embodiment, the inner sleeve and the semi-circumferential segments are both made by 3D printing.

[0019] The present invention adopts the above technical solution, which has the beneficial effect that the anastomosis time can be greatly shortened through mechanical anastomosis. At the same time, thanks to the uniform operation, the incidence of vascular-related complications can be reduced, the learning curve of surgeons can be shortened, the operation time can be greatly shortened, the operation effect can be improved, and the operation risk can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of an absorbable venous anastomosis auxiliary device according to a first embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the absorbable venous anastomosis assist device is shown in use.

[0022] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 is along Figure 2 Schematic diagram of the cross section taken along line BB;

[0024] Figure 5 Schematic diagram of a semi-circumferential tube segment of an absorbable venous anastomosis auxiliary device according to a second embodiment of the present invention, wherein two semi-circumferential tube segments are pivotally connected.

[0025] Figure 6 Schematic diagram of a semicircular tube segment of an absorbable venous anastomosis auxiliary device according to a third embodiment of the present invention.

[0026] Figure 7 Schematic diagram of a semicircular tube segment of an absorbable venous anastomosis auxiliary device according to a fourth embodiment of the present invention.

[0027] Figure 8Schematic diagram of a semicircular tube segment of an absorbable venous anastomosis auxiliary device according to a fifth embodiment of the present invention.

[0028] List of reference numerals: 100, vein; 1, inner cannula; 2, semicircumferential tube segment; 21, fixing ear; 22, groove; 23, slot; 24, buckle; 25, suture; 26, suture loop. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0030] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0031] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0032] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0033] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0034] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0035] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] like Figure 1 As shown, an absorbable venous anastomosis auxiliary device may include an inner sleeve 1 and two semi-circumferential tube segments 2. Among them, the inner wall of the inner sleeve 1 is smooth to reduce resistance, and the outer wall is rough to increase the friction between the blood vessel and the outer wall of the inner sleeve. The inner sleeve 1 is used to dock the ends of two sections of venous blood vessels to be anastomosed. The inner and outer walls of the semi-circumferential tube segment 2 are rough to increase the friction between the blood vessel and the inner wall of the semi-circumferential tube segment 2 and the friction between the suture and the outer wall of the semi-circumferential tube segment. The two semi-circumferential tube segments 1 have the same size and can be relatively combined into a complete circular tube. The two semi-circumferential tube segments 2 are used to clamp and fix the overlapping docking parts of the two sections of venous blood vessels from the outside. The inner sleeve 1 and the semi-circumferential tube segment 2 are both made of degradable absorbent materials. The degradable absorbent material may be a polyester polymer material such as polylactic acid-glycolic acid copolymer (PLGA), polylactic acid (PLA), polylactic acid (PLLA), polycaprolactone (PCL), polyanhydride (PAD), polycarbonate (PC) or polyhydroxyalkyl methacrylate, a protein material such as keratin, fibroin or collagen, a polysaccharide material such as cellulose, chitin or chitosan, or other medical materials. Preferably, the inner sleeve 1 and the semi-circular tube segment 2 can be made of PLGA by 3D printing. It should be understood that the inner sleeve 1 and the semi-circular tube segment 2 can also be manufactured by an integral molding process such as injection molding or extrusion molding. The circumferential ends of the semi-circular tube segment 2 (hereinafter referred to as the upper end and the lower end) are each provided with a plurality of (3 are shown) radially extending fixing ears 21. When in use, the two semi-circular tube segments 2 can be tied together by passing the fixing ears 21 through the degradable surgical sutures. It should be understood that the semi-circular tube segment 2 may also be directly tied together with sutures without the fixing ears 21.

[0038] Figure 2The schematic diagram of the use of the absorbable venous anastomosis auxiliary device of the present invention is shown. The specific steps are as follows: 1. The proximal end of the vein 100 (also called the first segment of the vein) passes through the inner sleeve 1, close to the inner wall of the inner sleeve 1, and the blood vessel wall is everted and sleeved on the outer wall of the inner sleeve 1; 2. The distal end of the vein 100 (also called the second segment of the vein) is sleeved into the outer wall of the inner sleeve and covers the everted part of the proximal end of the blood vessel; 3. Two semi-circumferential tube segments 2 are used to tightly press the overlapping parts of the two segments of the vein (i.e., the proximal end and the distal end of the blood vessel) (i.e., the position to be anastomosed); 4. Use degradable surgical sutures to pass through the fixing ears 21 to sew and tie the two semi-circumferential tube segments 2 tightly to fix the blood vessels and complete the vascular anastomosis. Figure 3 and Figure 4 As shown, the inner sleeve 1 is clamped between the proximal end of the blood vessel and the proximal everted part of the blood vessel, and does not directly contact the blood and does not affect the coagulation system. The whole process does not require suturing of the venous blood vessels, which is easy to operate and saves operation time. At the same time, a mechanical anastomosis method is used to achieve uniform anastomosis, shorten the learning curve of surgeons, and reduce the difficulty of vascular anastomosis surgical technology operation; and it has high biosafety, the material is degradable, and the degradation time is controllable; it can quickly restore blood flow, reduce organ ischemic damage; prevent leakage, and reduce postoperative complications.

[0039] Preferably, the outer wall of the inner sleeve 1 and the inner and outer walls of the semi-circumferential tube segment 2 have regular textures, such as circumferential (transverse) stripes, axial (longitudinal) stripes, convex dot arrays or concave pit arrays, etc., to increase friction. Regular textures can facilitate manufacturing.

[0040] The size of the inner sleeve 1 and the semi-circumferential tube segment 2 can be determined according to the type of vein to be connected and the degradation time. Usually, the wall thickness and length of the inner sleeve 1 and the semi-circumferential tube segment 2 can be the same, for example, the wall thickness is 0.3 to 1 mm and the length is 1 to 3 cm. The outer diameter of the inner sleeve 1 matches the size of the vein to be connected, for example, for the portal vein, the outer diameter is usually about 1.0 cm, and for the inferior vena cava, the outer diameter is usually about 2.0 cm. The inner diameter of the semi-circumferential tube segment 2 is usually larger than the outer diameter of the inner sleeve 1 by about one time the thickness of the vein wall, that is, about 2 mm.

[0041] Figure 5 The structure of the semicircular tube segment 2 of the absorbable venous anastomosis auxiliary device of the second embodiment of the present invention is shown. In this embodiment, one end (circumferential end) of the two semicircular tube segments 2 is pivoted (for example, similar to a hinge structure), so that the two semicircular tube segments 2 can rotate relative to each other to achieve opening or closing. When in use, the two semicircular tube segments 2 are opened and sleeved on the butt-jointed overlapping parts of the two sections of the venous blood vessels, and then closed and the two semicircular tube segments 2 are tied tightly with a degradable surgical suture thread passing through the fixing ear 21, which is very convenient and greatly improves the efficiency of the operation.

[0042] Figure 6The structure of the semicircular tube segment 2 of the absorbable venous anastomosis auxiliary device of the third embodiment of the present invention is shown. In this embodiment, the circumferential ends of the two semicircular tube segments 2 are provided with a clamping structure that docks with each other, through the clamping structure. Specifically, a plurality of clamping grooves 22 are provided at the circumferential ends of one semicircular tube segment 2, and a plurality of buckles 23 are provided at the circumferential ends of the other semicircular tube segment 2. The clamping groove 22 can be a rectangular hole or a round hole, and correspondingly, the buckle 23 can be a rectangular hook or a spherical buckle. It should be understood that the clamping groove 22 and the buckle 23 can be arranged at intervals at the circumferential end of a semicircular tube segment 2, or the clamping groove 22 and the buckle 23 can be respectively arranged on the two circumferential ends of a semicircular tube segment 2. When in use, the blood vessel can be fixed by clamping the buckle 23 into the clamping groove 22, which is very convenient and greatly improves the efficiency of the operation. It should be understood that in order to ensure that the two semicircular tube segments 2 will not be disengaged before the blood vessels are anastomosed, they can also be bundled and reinforced with degradable surgical sutures.

[0043] In a variation of this embodiment, one end (circumferential end) of the two semi-circumferential segments 2 is pivotally connected together, and the other end is provided with a clamping structure to facilitate operation.

[0044] Figure 7 The structure of the semi-circumferential tube segment 2 of the absorbable venous anastomosis auxiliary device of the fourth embodiment of the present invention is shown. In this embodiment, a plurality of (three are shown) circumferentially extending grooves 24 are provided on the outer wall of the semi-circumferential tube segment 2, and the grooves 24 are used to receive degradable surgical sutures to facilitate bundling the two semi-circumferential tube segments 2 together. When in use, the sutures are bundled along the grooves 24 to avoid slipping of the sutures, improve work efficiency, and ensure that the bundling is tight. Similarly, in a variation of the present embodiment, one end (circumferential end) of the two semi-circumferential tube segments 2 can also be pivoted together to facilitate operation.

[0045] Figure 8 The structure of the semicircular tube segment 2 of the absorbable venous anastomosis auxiliary device of the fifth embodiment of the present invention is shown. In the above embodiments, the degradable surgical sutures are independent of the semicircular tube segment. In this embodiment, one semicircular tube segment 2 is pre-buried with a plurality of sutures 25 extending circumferentially to a predetermined length (for example, 2.0 to 5.0 cm) at both ends, and the other semicircular tube segment is pre-buried with corresponding suture rings 26 at both ends of the circumference. When in use, the suture 25 only needs to be fastened to the suture ring 26 to achieve blood vessel fixation, which is very convenient. It should be understood that both semicircular tube segments can use pre-buried sutures.

[0046] Likewise, in a variation of this embodiment, one end (circumferential end) of the two semi-circumferential tube segments 2 may also be pivotally connected together to facilitate operation.

[0047] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An absorbable venous anastomosis auxiliary device, characterized in that: include: An inner sleeve, the inner wall of the inner sleeve is smooth and the outer wall is rough, and the inner sleeve is used to butt the ends of two sections of venous blood vessels to be anastomosed; as well as Two semi-circumferential segments, both inner and outer walls of the semi-circumferential segments are rough, and the two semi-circumferential segments are used to clamp and fix the overlapping butt joint parts of two sections of venous blood vessels from the outside; Wherein, the inner sleeve and the semi-circumferential tube segment are both made of degradable absorbent material.

2. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: The outer wall of the inner sleeve and the inner and outer walls of the semi-circumferential tube segment both have regular textures.

3. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: A plurality of radially extending fixing ears are provided at both circumferential ends of the semi-circumferential tube segment.

4. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: Both ends of the two semi-circumferential tube segments in the circumferential direction are provided with clamping structures that butt against each other.

5. The absorbable venous anastomosis auxiliary device according to claim 4, characterized in that: The clamping structure comprises a plurality of clamping slots and a plurality of clamping buckles, wherein the clamping slots and the clamping buckles are respectively arranged on two butted circumferential ends or are arranged at intervals on the same circumferential end.

6. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: One ends of the two semi-circumferential tube segments are pivotally connected so that the two semi-circumferential tube segments can rotate relative to each other to achieve opening and closing.

7. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: The outer wall of the semi-circumferential tube segment is provided with a plurality of circumferentially extending grooves.

8. The absorbable venous anastomosis assisting device according to claim 1, characterized in that: One of the half-circumferential segments is pre-embedded with a plurality of sutures extending circumferentially to predetermined lengths at both ends, and the other half-circumferential segment is pre-embedded with corresponding suture rings at both circumferential ends.

9. The absorbable venous anastomosis assisting device according to claim 1, characterized in that: The degradable absorbent material includes polylactic acid-co-glycolic acid, polylactic acid, poly(L-lactic acid), polycaprolactone, polyanhydride, polycarbonate, polyhydroxyalkyl methacrylate, keratin, silk fibroin, collagen, cellulose, chitin and chitosan.

10. The absorbable venous anastomosis auxiliary device according to claim 1, characterized in that: The inner sleeve and the semi-circumferential tube segments are both made by 3D printing.

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