Left ventricle indwelling hard sheath for connecting artificial blood vessel

Abstract

An inner cavity of a sheath tube and an inner cavity of a large head portion are communicated, an air bag is arranged on the outer side face of the front end portion of the sheath tube, a medical felt tube sleeve is sleeved on the sheath tube, a section of light tube is reserved between the medical felt tube sleeve and the air bag, a section of external threads is arranged on the rear end portion of the sheath tube close to the medical felt tube sleeve, and the external threads are communicated with the air bag. A medical felt gasket and a nut are sequentially arranged on the external thread, a plurality of narrow kerfs which are through front and back are formed in the peripheral side of the nut, a plurality of winding hooks are arranged on the rear side face of the nut, the winding hooks are circularly arranged to form a wire spool, the inner diameter of a base circle where the winding hooks are located is larger than the outer diameter of a base circle of the large head part, and a containing cavity is formed in the large head part. A blood blocking valve is arranged on a base of the containing cavity, an internal thread port is formed in the outer end of the large head portion, and the blood blocking valve blocks the internal thread port. When an artificial heart device is implanted, the heart of a patient does not need to be stopped and cardiac muscle does not need to be cut off, surgical operation is simplified, the surgical process is shortened, and the influence on the heart function of the patient is relieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a left ventricular indwelling hard sheath for connecting an artificial blood vessel. Background Art

[0002] In the clinical practice of cardiac surgery, heart failure and heart rupture are often encountered. It is necessary to implant an artificial heart device in time to replace the left ventricle to pump blood to the ascending aorta, help patients pass the dangerous stage, decompress the heart, and rest, which is conducive to myocardial recovery. Artificial heart devices include rigid interfaces, artificial blood vessels, artificial pumps, etc. During the operation, myocardial protective fluid needs to be perfused to stop the patient's heart from beating, and then the rigid interface is sewn on the outside of the myocardium of the left ventricle, and the myocardium corresponding to the center of the rigid interface is removed to form a stoma, so that the rigid interface is connected to the inner cavity of the left ventricle, and the rigid interface is then connected to the ascending aorta through artificial blood vessels and artificial pumps. During the recovery of the patient's heart function, the artificial pump device is always left in the patient's body, which usually takes several days to more than ten days. This type of operation is relatively cumbersome and the operation process is long. In addition, cardiac arrest and myocardial resection have a great impact on the patient's heart function. The stoma is traumatic, the patient feels strong discomfort after surgery, and the recovery time is long. In addition, the inner end of the stoma is not smooth, the blood flow is not smooth, and thrombosis is easy to occur. The hyperplasia of myocardial tissue at the stoma is easy to form scars and block the channel.

[0003] As a relatively mature medical device, vascular sheaths are usually used in surgeries for interventional treatment via vascular routes. For example, in artificial heart valve replacement surgery, vascular sheaths can be used through vascular puncture technology to establish a surgical channel from the outside of the body to the lumen of the blood vessel on large blood vessels such as the femoral artery, femoral vein, and jugular vein for surgical instruments to pass through. The vascular sheath usually includes a sheath tube and a blood-blocking valve disposed in the sheath tube. Its specific structural form can be referred to patent documents such as "Vascular Sheath" (application number: 202223206991.8), "Vascular Sheath Device and System" (application number: 202223245825.9), and "A Vascular Sheath Tube with Balloon" (application number: 202222833697.3).

[0004] In the field of cardiac surgery technology for repairing or replacing the mitral valve, aortic valve, tricuspid valve, pulmonary valve and ventricular septum, some doctors are also trying to use the vascular sheath to intervene through the apical approach. Before the operation, a hemostatic purse is sewn on the outer side of the myocardium corresponding to the apex of the heart. Figure 1, six pieces of medical felt are pieced together into a hexagon, and two surgical threads are staggered to sew three pieces of medical felt to the outside of the myocardium. The two surgical threads are left with sufficient length and led out of the body. The center of the hexagon is set as the puncture area. After puncturing in the puncture area, the vascular sheath is placed on the myocardium, and then the two surgical threads of the hemostatic purse are tightened to tighten the myocardium at the puncture site to the vascular sheath to prevent bleeding. The medical felt can refer to the felt sheet in the patent document "A Felt Sheet Threading Device" (Application Number: 202122213082.6). Compared with myocardial resection, the effect of puncture and stoma on the myocardium is much smaller, but it is limited by the structure of the vascular sheath itself. Interventional treatment via the apical approach using the vascular sheath is somewhat inconvenient in intracardiac surgery.

[0005] The inventor of the present application was inspired by clinical practice and made improvements on the structure of the vascular sheath so that it can be punctured and quickly positioned on the myocardium to replace the rigid interface in the artificial heart device for connecting artificial blood vessels. Thus, a left ventricular indwelling rigid sheath for connecting artificial blood vessels was proposed. Summary of the invention

[0006] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a left ventricular indwelling hard sheath for connecting an artificial blood vessel.

[0007] The above technical problems of the utility model are mainly solved by the following technical solutions: a left ventricular indwelling rigid sheath for connecting an artificial blood vessel, comprising a sheath tube and a large head arranged at the rear end of the sheath tube, the inner cavities of the sheath tube and the large head are connected, an air bag is arranged on the outer side of the front end of the sheath tube, a first channel and a second channel are arranged along the tube wall of the sheath tube, corresponding to the first channel, a first opening is arranged on the tube wall of the sheath tube, the first channel is connected to the air bag via the first opening, corresponding to the second channel, a plurality of second openings are arranged on the tube wall of the sheath tube, the second channel is connected to the inner cavity of the sheath tube via the second opening, the first channel and the second channel extend backward along the sheath tube until they pass through the large head, and are respectively connected A hose interface is provided on the outer end surface of the large head, and a medical felt sleeve is provided on the sheath tube. A section of light tube is left between the medical felt sleeve and the airbag, and next to the medical felt sleeve, a section of external thread is provided on the rear end of the sheath tube, and a medical felt washer and a nut are provided on the external thread in sequence. The circumference of the nut is provided with a plurality of narrow slits that pass through the front and back, and a plurality of winding hooks are provided on the rear side of the nut. The winding hooks are arranged in a circular shape to form a winding disk, and the inner diameter of the base circle where the winding hooks are located is larger than the outer diameter of the base circle of the large head. A accommodating cavity is provided in the large head, and a blood blocking valve is provided on the base of the accommodating cavity. An internal threaded port is provided at the outer end of the large head. In the free state, the blood blocking valve is blocked on the internal threaded port. The medical felt in the medical felt sleeve and the medical felt washer can refer to the felt sheet in the patent document "A Felt Sheet Threading Device" (application number: 202122213082.6).

[0008] Preferably, the sheath tube and the large head are integrally made of medical stainless steel or titanium alloy, and the airbag is made of high-elastic medical rubber, medical silicone, medical latex or medical polyurethane.

[0009] Preferably, the length L1 of the sheath is 2.0-3.0 cm, the thickness W1 of the sheath wall is 1.0-1.5 mm, the diameter D3 of the sheath lumen is 1.5-2.0 cm, the length L2 of the light tube between the medical felt tube sleeve and the airbag is 0.3-0.5 mm, the length L3 of the airbag is 0.8-1.2 cm, the thickness W2 is 0.03-0.09 mm, and the diameter D1 of the accommodating cavity is greater than the diameter D2 of the internal threaded port, and the diameter D2 of the internal threaded port is greater than the diameter D3 of the sheath lumen.

[0010] Preferably, 6-10 narrow slits are provided on the circumferential side of the nut and pass through from front to back, and the winding hooks on the rear side of the nut are arranged corresponding to the narrow slits.

[0011] Preferably, the blood blocking valve is a valve valve, and the valve valve is a prior art, and reference may be made to the patent document “A Bionic Valve Valve Structure” (application number: 201721454002.3).

[0012] Preferably, the large head is in the shape of an external hexagonal or external octagonal nut. When the nut is screwed and the artificial blood vessel is connected, a wrench can be used to clamp and fix the large head in the shape of an external hexagonal or external octagonal nut to facilitate force application.

[0013] Preferably, the outer surfaces of the airbag and the light tube are coated with a hydrophilic film, which is a hydrophilic polymer, and the hydrophilic polymer is polyethylene glycol, polyvinyl pyrrolidone, polyacrylamide, chitosan or hyaluronic acid.

[0014] In the utility model, the hose interface of the first channel is connected to the inflation and deflation device via the hose and the three-way valve on the hose, and the hose interface of the second channel is connected to the negative pressure device via the hose and the valve on the hose. These are all existing technologies and need no elaboration.

[0015] The utility model needs to be used together with a puncture device. The puncture device is a prior art, usually including an expansion handle and an expansion tube. A guide wire is arranged in the lumen of the expansion tube. For details, please refer to the expansion sheath and guide wire in the patent document "Vascular Sheath Device and System" (Application No.: 202223245825.9).

[0016] The sheath tube of the utility model is designed with various specifications between 2.0-3.0 cm in length to meet the needs of different patients. For a small number of patients with extremely thin myocardium (thickness 0.5 cm), the utility model can even save the medical felt tube sleeve. Before the operation, while examining the patient, the thickness of the patient's left ventricular myocardium is measured by cardiac B-ultrasound, so as to select a suitable sheath tube length for indwelling hard sheath.

[0017] Before puncture, sew the left ventricular myocardium on the outside of the patient's left ventricular myocardium corresponding to the apex of the heart. Figure 1 The hemostatic purse shown in the figure, the medical felt for sewing the hemostatic purse can refer to the felt sheet in the patent document "A felt sheet threading device" (application number: 202122213082.6), and then Figure 5 and Figure 6 As shown, the puncture device is assembled in the utility model, the expansion handle touches the internal threaded port, the expansion tube passes through the sheath, the valve valve is compressed into the accommodating cavity and tightly fits on the expansion tube, the guide wire passes through the lumen of the expansion tube, and its J-shaped elbow is suspended at the front end of the puncture device.

[0018] During puncture, first puncture the myocardium at the center of the puncture area with a steel needle and insert the J-shaped elbow of the guide wire into the left ventricle, then hold the expansion handle and follow the guide wire to puncture the left ventricle together with the puncture device, wherein the airbag on the outer side of the front end of the sheath enters the left ventricle, the light tube and the medical felt tube sleeve of the sheath body are embedded in the myocardium, the medical felt gasket and nut on the external thread are clamped on the outer side of the myocardium in the puncture area, and then the airbag is inflated by the inflation and deflation device. Figure 7 As shown, after the balloon is inflated, it is stuck on the inner side of the myocardium, and at the same time, the medical felt gasket is embedded in the puncture area. The nut is screwed until it is close to the hemostatic purse, so that the utility model is pre-set on the myocardium, and then the two surgical threads of the hemostatic purse are tightened, so that the myocardium in the puncture area is tightened on the sheath to prevent bleeding, and narrow slits are selected nearby, and the surgical threads are introduced into the winding hooks through the narrow slits, and the excess surgical threads are respectively coiled on the winding reels formed by the winding hooks, and the ends of the surgical threads are knotted and fixed on the winding hooks, and finally the puncture device and the guide wire are withdrawn, and the valve valve is re-sealed on the internal threaded port, so that the utility model can be connected to the artificial blood vessel through the connector device.

[0019] The utility model needs a matching connector device to connect the artificial blood vessel. The connector device is a conventional structure, usually including a gripping part, a connecting tube and an external interface. Figure 8As shown, when connected, the gripping part is screwed on the internal threaded port, the connecting tube is inserted into the sheath, the valve valve is compressed and retracted into the accommodating cavity and tightly fits on the connecting tube, and the external interface is connected to the artificial blood vessel. Of course, the structure can also be improved to design the connector device and the artificial blood vessel as an integrated structure, such as extending the connecting tube to form an artificial blood vessel, and the gripping part is rotatably set on the connecting tube, and the gripping part fixes the connecting tube on the internal threaded port.

[0020] During puncture and connection of artificial blood vessels, the puncture device, the utility model and the connector device may bring a small amount of air into the left ventricle to form blood foam. Therefore, it is necessary to open the negative pressure device to extract the blood foam through the second channel to minimize the impact on the heart.

[0021] After the patient's heart function is completely restored, the artificial heart device is turned off, the gas in the airbag is discharged first, and then the surgical thread knotted and fixed on the winding hook is untied and manually tightened, the utility model is slowly taken out, and finally the puncture stoma is sutured.

[0022] The utility model is retained on the myocardium of the patient's left ventricle and is used to connect artificial blood vessels. The technical effects are obvious: 1. When implanting an artificial heart device, there is no need to stop the patient's heart and remove the myocardium, which simplifies the surgical operation, shortens the operation, and reduces the impact on the patient's heart function. 2. Through structural design, the utility model can limit the depth of insertion into the ventricle and can be limited on the myocardium. The sheath will not slip during use, and the puncture and stoma trauma is small, which is conducive to reducing the patient's postoperative discomfort and quick recovery after surgery. 3. The utility model can be retained on the myocardium for a long time, the inflatable airbag is sealed at the inner end of the puncture and stoma, the inner myocardium is gathered on the light tube of the sheath, the blood flow is smooth, and it is not easy to produce thrombus. The outer myocardium is gathered on the medical felt tube sleeve of the sheath, the two have good fusion, and tissue hyperplasia is not easy to form scars, which is conducive to postoperative myocardial healing. 4. After puncture, the surgical thread of the hemostatic purse is tightened and coiled on the winding coil formed by the winding hook, and the end of the surgical thread is knotted and fixed on the winding hook, which further limits the position of the utility model, and the sheath will not slip or rotate during use. 5. The outer surface of the airbag and the light tube is coated with a hydrophilic film. When placed, the hydrophilic film contacts the blood and can adhere to the moisture in the blood, so that the outer surface of the airbag and the light tube is lubricated, which can reduce the damage to the myocardium during the placement and removal process. Therefore, the utility model has the characteristics of simple structure and reasonable design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of the hemostatic purse of the utility model;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 3It is a cross-sectional structural schematic diagram of the utility model;

[0026] Figure 4 It is a schematic diagram of the structure of the utility model being retained on the myocardium;

[0027] Figure 5 This is a three-dimensional structural schematic diagram of the utility model assembly trocar;

[0028] Figure 6 This is a schematic cross-sectional view of the assembled puncture device of the utility model;

[0029] Figure 7 It is a schematic diagram of a cross-sectional structure during the puncture process of the utility model;

[0030] Figure 8 The utility model is a schematic diagram of a cross-sectional structure of connecting an artificial blood vessel.

[0031] In the figure, 1-myocardium, 2-medical felt, 3-surgical line, 4-puncture area, 5-sheath, 51-airbag, 52-first channel, 53-second channel, 54-first opening, 55-second opening, 56-medical felt tube sleeve, 57-plain tube, 58-external thread, 6-large head, 61-internal thread port, 62-accommodating cavity, 63-hose interface, 7-hose, 8-blood blocking valve, 9-nut, 91-narrow slit, 92-winding hook, 10-felt gasket, 11-puncture device, 111-expansion handle, 112-expansion tube, 113-tube cavity, 114-guide wire, 12-connector device, 121-grip portion, 122-connecting tube, 123-external interface, 13-artificial blood vessel. DETAILED DESCRIPTION

[0032] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0033] Example: See Figure 2 , Figure 3 and Figure 4A left ventricular indwelling rigid sheath for connecting an artificial blood vessel comprises a sheath tube and a large head portion arranged at the rear end of the sheath tube, the inner cavities of the sheath tube and the large head portion are connected, an air bag is arranged on the outer side surface of the front end portion of the sheath tube, a first channel and a second channel are arranged along the tube wall of the sheath tube, corresponding to the first channel, a first opening is arranged on the tube wall of the sheath tube, the first channel is connected to the air bag via the first opening, corresponding to the second channel, a plurality of second openings are arranged on the tube wall of the sheath tube, the second channel is connected to the inner cavity of the sheath tube via the second opening, the first channel and the second channel extend backward along the sheath tube until they pass through the large head portion, and are respectively connected to a hose arranged on the outer end surface of the large head portion. Interface, a medical felt sleeve is provided on the sheath, a section of light tube is left between the medical felt sleeve and the airbag, and next to the medical felt sleeve, a section of external thread is provided on the rear end of the sheath, and a medical felt washer and a nut are provided on the external thread in sequence, and a plurality of narrow slits that pass through the front and back are provided on the circumference of the nut, and a plurality of winding hooks are provided on the rear side of the nut, and the winding hooks are arranged in a circular shape to form a winding disk, and the inner diameter of the base circle where the winding hooks are located is larger than the outer diameter of the base circle of the large head, and a receiving cavity is provided in the large head, and a blood blocking valve is provided on the base of the receiving cavity, and an internal threaded port is provided at the outer end of the large head, and in the free state, the blood blocking valve is blocked on the internal threaded port. The medical felt in the medical felt sleeve and the medical felt washer can refer to the felt sheet in the patent document "A Felt Sheet Threading Device" (application number: 202122213082.6). The sheath tube and the large head are made of medical stainless steel or titanium alloy, and the airbag is made of high-elastic medical rubber, medical silicone, medical latex or medical polyimide; the length L1 of the sheath tube is 2.0-3.0 cm, the thickness W1 of the sheath tube wall is 1.0-1.5 mm, the diameter D3 of the sheath tube cavity is 1.5-2.0 cm, the length L2 of the light tube between the medical felt tube sleeve and the airbag is 0.3-0.5 mm, the length L3 of the airbag is 0.8-1.2 cm, the thickness W2 is 0.03-0.09 mm, and the diameter D1 of the accommodating cavity is greater than the diameter D2 of the internal thread port, and the diameter D2 of the internal thread port is greater than the diameter D1 of the sheath tube cavity. Diameter D3; 6-10 narrow slits are provided on the circumference of the nut, and the winding hooks on the rear side of the nut are arranged corresponding to the narrow slits; the blood blocking valve is a valve valve, and the valve valve is a prior art, and reference can be made to the patent document "A Bionic Valve Valve Structure" (Application No.: 201721454002.3); the large head is in the shape of an external hexagonal or external octagonal nut, and when the nut is screwed and the artificial blood vessel is connected, a wrench can be used to clamp and fix the large head in the shape of an external hexagonal or external octagonal nut, which is convenient for applying force; the outer surfaces of the airbag and the light tube are coated with a hydrophilic film, which is a hydrophilic polymer, and the hydrophilic polymer is polyethylene glycol, polyvinyl pyrrolidone, polyacrylamide, chitosan or hyaluronic acid.

[0034] In the utility model, the hose interface of the first channel is connected to the inflation and deflation device via the hose and the three-way valve on the hose, and the hose interface of the second channel is connected to the negative pressure device via the hose and the valve on the hose. These are all existing technologies and need no elaboration.

[0035] The utility model needs to be used together with a puncture device. The puncture device is a prior art, usually including an expansion handle and an expansion tube. A guide wire is arranged in the lumen of the expansion tube. For details, please refer to the expansion sheath and guide wire in the patent document "Vascular Sheath Device and System" (Application No.: 202223245825.9).

[0036] The sheath tube of the utility model is designed with various specifications between 2.0-3.0 cm in length to meet the needs of different patients. For a small number of patients with extremely thin myocardium (thickness 0.5 cm), the utility model can even save the medical felt tube sleeve. Before the operation, while examining the patient, the thickness of the patient's left ventricular myocardium is measured by cardiac B-ultrasound, so as to select a suitable sheath tube length for indwelling hard sheath.

[0037] Before puncture, sew the left ventricular myocardium on the outside of the patient's left ventricular myocardium corresponding to the apex of the heart. Figure 1 The hemostatic purse shown in the figure, the medical felt for sewing the hemostatic purse can refer to the felt sheet in the patent document "A felt sheet threading device" (application number: 202122213082.6), and then Figure 5 and Figure 6 As shown, the puncture device is assembled in the utility model, the expansion handle touches the internal threaded port, the expansion tube passes through the sheath, the valve valve is compressed into the accommodating cavity and tightly fits on the expansion tube, the guide wire passes through the lumen of the expansion tube, and its J-shaped elbow is suspended at the front end of the puncture device.

[0038] During puncture, first puncture the myocardium at the center of the puncture area with a steel needle and insert the J-shaped elbow of the guide wire into the left ventricle, then hold the expansion handle and follow the guide wire to puncture the left ventricle together with the puncture device, wherein the airbag on the outer side of the front end of the sheath enters the left ventricle, the light tube and the medical felt tube sleeve of the sheath body are embedded in the myocardium, the medical felt gasket and nut on the external thread are clamped on the outer side of the myocardium in the puncture area, and then the airbag is inflated by the inflation and deflation device. Figure 7As shown, after the balloon is inflated, it is stuck on the inner side of the myocardium, and at the same time, the medical felt gasket is embedded in the puncture area. The nut is screwed until it is close to the hemostatic purse, so that the utility model is pre-set on the myocardium, and then the two surgical threads of the hemostatic purse are tightened, so that the myocardium in the puncture area is tightened on the sheath to prevent bleeding, and narrow slits are selected nearby, and the surgical threads are introduced into the winding hooks through the narrow slits, and the excess surgical threads are respectively coiled on the winding reels formed by the winding hooks, and the ends of the surgical threads are knotted and fixed on the winding hooks, and finally the puncture device and the guide wire are withdrawn, and the valve valve is re-sealed on the internal threaded port, so that the utility model can be connected to the artificial blood vessel through the connector device.

[0039] The utility model needs a matching connector device to connect the artificial blood vessel. The connector device is a conventional structure, usually including a gripping part, a connecting tube and an external interface. Figure 8 As shown, when connected, the gripping part is screwed on the internal threaded port, the connecting tube is inserted into the sheath, the valve valve is compressed and retracted into the accommodating cavity and tightly fits on the connecting tube, and the external interface is connected to the artificial blood vessel. Of course, the structure can also be improved to design the connector device and the artificial blood vessel as an integrated structure, such as extending the connecting tube to form an artificial blood vessel, and the gripping part is rotatably set on the connecting tube, and the gripping part fixes the connecting tube on the internal threaded port.

[0040] During puncture and connection of artificial blood vessels, the puncture device, the utility model and the connector device may bring a small amount of air into the left ventricle to form blood foam. Therefore, it is necessary to open the negative pressure device to extract the blood foam through the second channel to minimize the impact on the heart.

[0041] After the patient's heart function is completely restored, the artificial heart device is turned off, the gas in the airbag is discharged first, and then the surgical thread knotted and fixed on the winding hook is untied and manually tightened, the utility model is slowly taken out, and finally the puncture stoma is sutured.

[0042] The utility model is retained on the myocardium of the patient's left ventricle and is used to connect artificial blood vessels. The technical effects are obvious: 1. When implanting an artificial heart device, there is no need to stop the patient's heart and remove the myocardium, which simplifies the surgical operation, shortens the operation, and reduces the impact on the patient's heart function. 2. Through structural design, the utility model can limit the depth of insertion into the ventricle and can be limited on the myocardium. The sheath will not slip during use, and the stoma trauma is small, which is conducive to reducing the patient's postoperative discomfort and quick recovery after surgery. 3. The utility model can be retained on the myocardium for a long time, and the inflatable airbag is sealed at the inner end of the puncture stoma. The inner myocardium is gathered on the light tube of the sheath, the blood flow is smooth, and it is not easy to produce thrombus. The outer myocardium is gathered on the medical felt tube sleeve of the sheath. The two have good fusion, and tissue hyperplasia is not easy to form scars, which is conducive to postoperative myocardial healing. 4. After puncture, the surgical thread of the hemostatic purse is tightened and coiled on the winding coil formed by the winding hook, and the end of the surgical thread is knotted and fixed on the winding hook, which further limits the position of the utility model, and the sheath will not slip or rotate during use. 5. The outer surface of the airbag and the light tube is coated with a hydrophilic film. When placed, the hydrophilic film contacts the blood and can adhere to the moisture in the blood, so that the outer surface of the airbag and the light tube is lubricated, which can reduce the damage to the myocardium during the placement and removal process. Therefore, the utility model has the characteristics of simple structure and reasonable design.

[0043] Finally, it should be pointed out that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model should be considered to belong to the protection scope of the present utility model.

Claims

1. A left ventricular indwelling rigid sheath for connecting an artificial blood vessel, comprising a sheath tube and a large head arranged at the rear end of the sheath tube, wherein the inner cavities of the sheath tube and the large head are connected, and characterized in that An airbag is arranged on the outer side of the front end of the sheath tube, a first channel and a second channel are arranged on the tube wall of the sheath tube along the sheath tube, corresponding to the first channel, a first opening is arranged on the tube wall of the sheath tube, the first channel is connected to the airbag via the first opening, corresponding to the second channel, a plurality of second openings are arranged on the tube wall of the sheath tube, the second channel is connected to the inner cavity of the sheath tube via the second opening, the first channel and the second channel extend backward along the sheath tube until they pass through the large head, and are respectively connected to the hose interface arranged on the outer end surface of the large head, the sheath tube is sleeved with a medical felt tube sleeve, the medical felt tube sleeve and the airbag are connected to the airbag via the first opening, and the airbag is connected to the sheath tube via the second opening. A section of light tube is left between the capsules, which is adjacent to the medical felt tube sleeve. A section of external thread is provided on the rear end portion of the sheath tube, and a medical felt gasket and a nut are provided on the external thread in sequence. A plurality of narrow slits running through the front and rear are provided on the circumference of the nut, and a plurality of winding hooks are provided on the rear side surface of the nut. The winding hooks are arranged in a circle to form a winding disk, and the inner diameter of the base circle where the winding hooks are located is larger than the outer diameter of the base circle of the large head. A accommodating cavity is provided in the large head, and a blood blocking valve is provided on the base of the accommodating cavity. An internal threaded port is provided at the outer end of the large head, and the blood blocking valve is sealed on the internal threaded port in a free state.

2. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1, characterized in that The sheath tube and the large head are made of medical stainless steel or titanium alloy in one piece, and the airbag is made of high-elastic medical rubber, medical silica gel, medical latex or medical polyimide.

3. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1 or 2, characterized in that The length L1 of the sheath is 2.0-3.0 cm, the thickness W1 of the sheath wall is 1.0-1.5 mm, the diameter D3 of the sheath lumen is 1.5-2.0 cm, the length L2 of the light tube between the medical felt tube sleeve and the airbag is 0.3-0.5 mm, the length L3 of the airbag is 0.8-1.2 cm, the thickness W2 is 0.03-0.09 mm, and the diameter D1 of the accommodating cavity is greater than the diameter D2 of the internal threaded port, and the diameter D2 of the internal threaded port is greater than the diameter D3 of the sheath lumen.

4. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1 or 2, characterized in that The circumferential side of the nut is provided with 6-10 narrow slits penetrating from front to back, and the winding hooks on the rear side surface of the nut are arranged corresponding to the narrow slits.

5. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1 or 2, characterized in that The blood blocking valve is a valve valve.

6. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1 or 2, characterized in that The large head is in the shape of an external hexagonal or external octagonal nut.

7. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 1 or 2, characterized in that The outer surfaces of the air bag and the light pipe are coated with a hydrophilic film.

8. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 7, characterized in that The hydrophilic film on the outer surface of the airbag and the light pipe is a hydrophilic polymer.

9. A left ventricular indwelling hard sheath for connecting an artificial blood vessel according to claim 8, characterized in that The hydrophilic polymer is polyethylene glycol, polyvinyl pyrrolidone, polyacrylamide, chitosan or hyaluronic acid.

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