Catheter sheath for cardiac surgery and use method thereof

Abstract

The invention discloses a catheter sheath for cardiac surgery and a using method thereof.The catheter sheath for cardiac surgery is used for feeding in a cardiac surgery electrode wire and is provided with a catheter sheath assembly, the catheter sheath assembly is formed by combining two symmetrically-arranged catheter bases, and the catheter sheath is connected to the lower portion of the spliced catheter base assembly. The catheter sheath assembly, the fixing assembly and the expansion tube are installed, sealing is achieved when the catheter sheath assembly is inserted into a patient body through cooperation of the catheter sheath assembly and the expansion tube, blood is prevented from flowing out, and meanwhile the two separated catheter sheaths abut against the lower closing valves on the outer sides respectively when the catheter sheaths are stripped through the fixing assembly; the position of the opening is limited, the abutting position is the connecting position of the two lower closing flaps, the lower closing flaps cannot be expanded, in this way, the catheter sheath can be withdrawn conveniently, the situation that the expansion tube rebounds is avoided, it is guaranteed that insertion of the catheter sheath cannot be affected when the connecting rod is installed through the damping mechanism, and operation is convenient and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of catheter sheaths for cardiac surgery, and in particular to a catheter sheath for cardiac surgery and a use method thereof. Background Art

[0002] During cardiac pacing surgery, the electrode wire of the pacing pulse generator is inserted from the sheath to the heart, and the sheath is withdrawn after positioning, leaving the electrode wire in the body. Since the proximal end of the electrode wire is connected to the pacing pulse generator, the sheath cannot leave the wire, so the sheath for this surgery must be tearable. When withdrawing the sheath, tear the sheath into two pieces symmetrically, and tear it while withdrawing it until the sheath is completely torn out of the blood vessel and away from the wire.

[0003] The existing tearable catheter sheath is inconvenient to operate during use. The main reason is that when the sheath is peeled off, the separation opening position of the sheath will extend to the surgical opening position of the patient. When the sheath is pulled, the internal dilation tube may be pulled out, and it needs to be pulled and torn at the same time, which greatly reduces the efficiency. For cardiac surgery, it increases the operation time and also increases the risk of surgery in disguise.

[0004] Therefore, how to solve the problem that the catheter sheath used in cardiac surgery is inconvenient to operate, which increases the duration and risk of the operation, is a problem that needs to be solved currently. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that when the existing tearable catheter sheath is peeled off, the separation opening position of the sheath will extend to the surgical opening position of the wound, and the internal expansion tube may be pulled out when the sheath is pulled, which requires pulling and tearing at the same time, which greatly reduces the efficiency. For cardiac surgery, the operation time is increased, and the risk of surgery is increased in disguise. The catheter sheath for cardiac surgery and the use method of the present invention do not add cumbersome steps during use, and do not affect the electrode wire of the pacing pulse generator entering the expansion tube. At the same time, the catheter sheath can be peeled off quickly and stably afterwards, which improves convenience and practicality.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A catheter sheath for cardiac surgery is used for delivering electrode wires in cardiac surgery. It has a catheter sheath assembly, which is composed of two symmetrically arranged tube seats. The lower part of the spliced ​​tube seat assembly is connected to the catheter sheath, and the catheter sheath is axially connected to the tube seat assembly. A cavity is formed inside the catheter sheath, and an expansion tube is inserted therein. The expansion tube and the tube seat are buckled with each other by buckle cards and buckle caps respectively arranged at the top ends of the two, which are used for positioning after insertion.

[0008] A fixing component is provided below the connection between the tube seat and the catheter sheath. The fixing component includes two symmetrically arranged lower closing flaps. A connecting hole is formed by closing the lower closing flaps to achieve connection with the catheter sheath. A damping mechanism is provided inside each lower closing flap. One end of a connecting rod is rotatably connected to the outside of the lower closing flap to achieve damped rotation of the connecting rod. The other end of the single connecting rod is connected to an upper closing flap. The upper closing flap is closed by rotating the two connecting rods and connected to the expansion tube to achieve the position of the fixed opening when the catheter sheath is peeled off.

[0009] The aforementioned catheter sheath for cardiac surgery, the sheath assembly also includes a sealing plug placed inside the tube seat and cut in half, and the internal sealing of the sheath assembly is achieved by closing the gap of the sealing plug. The interior of the tube seat is located above the sealing plug and is also provided with foam that has been cut in half for lubrication when inserting the expansion tube.

[0010] The aforementioned catheter sheath for cardiac surgery has snap-fitting pieces symmetrically arranged on the side surface of a single tube seat, and the buckle cap is snap-fitted and connected with it through snap-fitting openings arranged on both sides thereof, and an extension tube penetrating through the side surface of any tube seat is arranged.

[0011] The aforementioned catheter sheath for cardiac surgery has a rotating groove inside a single lower closing valve, and a damping mechanism is placed horizontally inside the rotating groove; the damping mechanism specifically includes a rotating rod and a rotating hole, the rotating rod is placed horizontally inside the rotating groove, and a plurality of grooves are arranged in a circle-centered array on its outer side, the rotating hole is penetrated and opened at the lower end of a single connecting rod, and two convex strips are provided inside the hole in a mirror-symmetrical manner, and the connecting rod is connected to the lower closing valve through the connection between the rotating hole and the rotating rod, and the damping positioning of the connecting rod is realized through the connection between the convex strip and the groove.

[0012] In the aforementioned catheter sheath for cardiac surgery, the lower closing valve and the upper closing valve are each connected to each other by plugging the closing pins symmetrically arranged on both sides into the closing holes to achieve closed splicing.

[0013] The aforementioned catheter sheath for cardiac surgery, the dilation tube is formed by splicing a tube body and a fixing part, and the interior of both is a through structure, the buckle card is placed outside the fixing part, and is plugged into the tube seat and the catheter sheath through the tube body.

[0014] The aforementioned catheter sheath for cardiac surgery has two twisting parts symmetrically arranged on the outside of the fixing part above the buckle card, the upper closing flap is connected to the fixing part to achieve splicing, and a shielding part is arranged on the top side of the fixing part for abutting against the upper closing flap.

[0015] In the aforementioned catheter sheath for cardiac surgery, the tube seat is made by in-mold injection molding to achieve compatibility with the catheter sheath during processing, and thin walls are symmetrically provided at the connection between the two tube seats and inside the catheter sheath.

[0016] In the aforementioned catheter sheath for cardiac surgery, the thickness of the thin wall is 0.2mm-0.3mm.

[0017] A method for using a catheter sheath for cardiac surgery comprises the following steps:

[0018] Step (A), when in use, firstly, two lower closing flaps inside the fixing assembly are spliced ​​with the catheter sheath, and the closing pin is connected with the closing hole to form a connecting hole that fits and wraps around the outside of the catheter sheath, and the distance is slightly farther than the position of the tube seat, and then the connecting rod is rotated, and the rotation is realized through the cooperation of the rotating hole and the rotating rod. At the same time, during the rotation process, the convex strip inside the rotating hole will be connected with the groove to provide damping, and the two rotating rods will stop after being rotated to a relatively horizontal state, so that there is no obstruction at the front end when the catheter sheath is subsequently inserted;

[0019] Step (B), then the expansion tube needs to be pre-inserted into the catheter sheath, and the expansion tube is smoothly inserted into the catheter sheath by pre-coating the inside of the foam with medical-grade silicone oil, and passes through the sealing plug, and the sealing plugs cut in half are squeezed against each other to seal the inside of the catheter sheath, and at the same time, the expansion tube is rotated by pinching the twisting part to position the buckle card and the buckle cap, and then the expansion tube and the catheter sheath are inserted into the opening pre-opened in the patient's body, and the catheter sheath and the expansion tube are completely sent into the patient's body, connected to the extension tube through an external tool, and the excess air inside is extracted, and then the catheter sheath is prepared to be peeled off;

[0020] Step (C), before peeling, the connecting rod is rotated again, and the convex strips inside the rotating hole are replaced with different grooves alternately, so as to realize damping rotation, and at the same time, the two connecting rods are rotated to a state parallel to each other, at which time the two upper closing flaps are in contact with the fixing part outside the expansion tube, and at the same time, the closing hole and the closing pin inside the upper closing flap are closed, so as to realize the fixation of the lower closing flap and the expansion tube;

[0021] Step (D), then peel off the catheter sheath, gently pull the tube seats on both sides, and the tube seats are separated because of the thin-walled structure at the connection. At the same time, the snap-fit ​​caps are detached from the snap-fit ​​card, and the fixation with the expansion tube is released. The separation of the two tube seats will drive the catheter sheaths connected to each other to separate along the thin wall until the catheter sheaths are completely separated and pulled out of the patient's body, leaving the expansion tube, and the upper closing valve and the lower closing valve are separated respectively, and the connection with the expansion tube is released to achieve disassembly. Then, the electrode wire of the pacing pulse generator can be sent into the patient's body through the expansion tube.

[0022] The present invention provides a catheter sheath for cardiac surgery and a method of using the same. The catheter sheath assembly, a fixing assembly and an expansion tube are installed. First, the cooperation between the catheter sheath assembly and the expansion tube realizes sealing when the catheter sheath is inserted into the patient's body to prevent blood from flowing out. At the same time, the fixing assembly realizes that the two valves of the catheter sheath separated at the same time when the catheter sheath is peeled off will respectively abut on the lower closed valve on the outside to limit the position of the opening. The abutting position is the connection between the two lower closed valves, and the lower closed valve will not be expanded. In this way, the catheter sheath can be easily withdrawn without the rebound of the expansion tube. The damping mechanism ensures that the connecting rod will not affect the insertion of the catheter sheath during installation. The operation is convenient, which solves the problem that the catheter sheath for cardiac surgery at this stage is inconvenient to operate and increases the operation time and risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a catheter sheath for cardiac surgery of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a dilation tube and a sheath assembly of a catheter sheath for cardiac surgery of the present invention;

[0025] Figure 3 It is a schematic diagram of the internal structure of a sheath assembly of a catheter sheath for cardiac surgery of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a fixing assembly of a catheter sheath for cardiac surgery of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a closing hole and a closing pin of a catheter sheath for cardiac surgery of the present invention;

[0028] Figure 6 It is a structural schematic diagram of a damping mechanism of a catheter sheath for cardiac surgery of the present invention;

[0029] Figure 7 It is a schematic structural diagram of a lower closure valve of a catheter sheath for cardiac surgery according to the present invention.

[0030] The meanings of the symbols in the accompanying drawings are as follows:

[0031] 1. Tube sheath assembly; 101. Tube seat; 102. Catheter sheath; 103. Extension tube; 104. Snap-on cap; 105. Foam; 106. Snap-on sheet; 107. Sealing plug; 108. Snap-on mouth; 2. Expansion tube; 201. Shielding part; 202. Twisting part; 203. Tube body; 204. Snap-on card; 205. Fixing part; 3. Fixing assembly; 301. Upper closing flap; 302. Connecting rod; 303. Lower closing flap; 304. Rotating groove; 305. Closing pin; 306. Closing hole; 307. Connecting hole; 4. Damping mechanism; 401. Rotating hole; 402. Rotating rod; 403. Groove; 404. Raised strip. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figure 1-Figure 7 As shown, a catheter sheath for cardiac surgery of the present invention is used for delivering electrode wires for cardiac surgery, and has a catheter sheath assembly 1, which is composed of two symmetrically arranged tube seats 101. A catheter sheath 102 is connected to the lower part of the spliced ​​tube seat 101 assembly, and is axially connected to the tube seat 101 assembly. A cavity is formed inside the catheter sheath, and an expansion tube 2 is inserted therein; the expansion tube 2 and the tube seat 101 are buckled with each other by a buckle card 204 and a buckle cap 104 respectively arranged at the top of the two, which are used for positioning after insertion.

[0034] A fixing component 3 is provided below the connection between the tube seat 101 and the catheter sheath 102. The fixing component 3 includes two symmetrically arranged lower closing flaps 303. The lower closing flaps 303 are closed to form a connecting hole 307 to achieve connection with the catheter sheath 102, and a damping mechanism 4 is provided inside each lower closing flap 303. One end of the connecting rod 302 is rotatably connected to the outside to achieve damped rotation of the connecting rod 302. The other end of the single connecting rod 302 is connected to the upper closing flap 301. By rotating the two connecting rods 302, the upper closing flap 301 is closed and connected to the expansion tube 2 to achieve the position of the fixed opening when the catheter sheath 102 is peeled off.

[0035] Preferably, the sheath assembly 1 also includes a sealing plug 107 placed inside the tube seat 101 and cut in half. The internal sealing of the sheath assembly 1 is achieved by closing the gap of the sealing plug 107. The interior of the tube seat 101 is located above the sealing plug 107 and is also provided with a foam 105 cut in half for lubrication when inserting the expansion tube 2. The sealing plugs 107 cut in half are squeezed against each other to achieve sealing. At the same time, when the expansion tube 2 is inserted, they will be squeezed against the outside of the expansion tube 2 to strengthen the seal and achieve blood closure. The inside of the foam 105 can be soaked with medical silicone oil so that it can be pre-coated on the outside of the expansion tube 2 when inserted, thereby achieving smooth delivery.

[0036] Preferably, a single tube seat 101 is symmetrically provided with snap-fitting pieces 106 on the side surface, and the snap-fitting cap 104 is snap-fitted and connected thereto via snap-fitting openings 108 provided on both sides thereof. An extension tube 103 is provided on the side surface of any tube seat 101 and passes through it. The snap-fitting pieces 106 and the snap-fitting openings 108 can realize the quick installation of the snap-fitting cap 104, and the extension tube 103 facilitates the extraction of air from the inner part of the catheter sheath 102, which is more practical.

[0037] Preferably, a single lower closing flap 303 is provided with a rotating groove 304 inside, and the damping mechanism 4 is horizontally placed inside the rotating groove 304; the damping mechanism 4 specifically includes a rotating rod 402 and a rotating hole 401, the rotating rod 402 is horizontally placed inside the rotating groove 304, and a plurality of grooves 403 are arranged in a circle-centered array on its outer side, the rotating hole 401 passes through the lower end of the single connecting rod 302, and two convex strips 404 are mirror-symmetrically arranged inside the rotating hole 401, and the connecting rod 302 is connected to the lower closing flap 303 through the connection with the rotating rod 402 through the rotating hole 401, and the damping positioning of the connecting rod 302 is achieved through the connection between the convex strip 404 and the groove 403, and the damping rotation of the convex strip 404 and the groove 403 is achieved. The convex strip 404 can be made of a slightly elastic material, such as rubber material, to achieve contraction and rebound during rotation, and can form an alternating switching effect with the groove 403, thereby achieving the effect of damping rotation, preventing the connecting rod 302 from swinging randomly without damping, thereby affecting the use.

[0038] Preferably, the lower closing flap 303 and the upper closing flap 301 are each connected by the closing pins 305 and the closing holes 306 symmetrically arranged on both sides to achieve closed splicing. The closing pins 305 and the closing holes 306 facilitate the closing of the lower closing flap 303 and the upper closing flap 301 to each other, thereby achieving rapid splicing and convenient operation.

[0039] Preferably, the expansion tube 2 is composed of a tube body 203 and a fixing portion 205, and the interior of the two is a through structure. The buckle card 204 is placed on the outside of the fixing portion 205, and is plugged into the tube seat 101 and the catheter sheath 102 through the tube body 203. The buckle card 204 facilitates the rapid fixation of the expansion tube 2 and the tube seat 101, and is convenient for connection.

[0040] Preferably, two twisting parts 202 are symmetrically provided on the outer side of the fixing part 205 above the buckle card 204, and the upper closing flap 301 is connected to the fixing part 205 to achieve splicing, and a shielding part 201 is provided on the top side of the fixing part 205 for abutting against the upper closing flap 301. The shielding part 201 can shield the upper closing flap 301 to prevent it from falling off, which is more practical.

[0041] Preferably, the tube seat 101 is molded using an in-mold injection molding process to achieve compatibility with the catheter sheath 102 during processing, and thin walls are symmetrically provided at the connection between the two tube seats 101 and inside the catheter sheath 102. The thin walls ensure that the tube seat 101 and the catheter sheath 102 can be quickly separated, and the practicality is strong.

[0042] Preferably, the thickness of the thin wall is 0.2 mm-0.3 mm, and the thin wall is uniform, ensuring smooth separation and the strength of the catheter sheath 102 .

[0043] A method for using a catheter sheath for cardiac surgery of the present invention comprises the following steps:

[0044] Step (A), when in use, firstly, the two lower closing petals 303 inside the fixing component 3 are spliced ​​with the catheter sheath 102, and the closing pin 305 is connected with the closing hole 306 to form a connecting hole 307 that fits and wraps around the outside of the catheter sheath 102, and the distance is slightly farther than the position of the tube seat 101, and then the connecting rod 302 is rotated, and the rotation is realized through the cooperation of the rotating hole 401 and the rotating rod 402. At the same time, during the rotation process, the convex strip 404 inside the rotating hole 401 will be connected with the groove 403 to provide damping. After the two rotating rods 402 are rotated to a relatively horizontal state, they are still, so that there is no obstruction at the front end when the catheter sheath 102 is subsequently inserted;

[0045] Step (B), then the expansion tube 2 needs to be pre-inserted into the catheter sheath 102, and the inside of the foam 105 is pre-coated with medical-grade silicone oil to achieve smooth insertion of the expansion tube 2 into the catheter sheath 102, and pass through the sealing plug 107, and the sealing plug 107 cut in half squeezes each other to seal the inside of the catheter sheath 102, and at the same time, the twisting part 202 is pinched to rotate the expansion tube 2 to achieve the positioning of the buckle card 204 and the buckle cap 104, and then the expansion tube 2 and the catheter sheath 102 are inserted into the opening pre-opened in the patient's body, and the catheter sheath 102 and the expansion tube 2 are completely sent into the patient's body, connected to the extension tube 103 through an external tool, and the excess air inside is extracted, and then the catheter sheath 102 is prepared to be peeled off;

[0046] Step (C), before peeling, the connecting rod 302 is rotated again, and the convex strips 404 inside the rotating hole 401 thereof are alternately replaced with different grooves 403, so as to realize damping rotation, and at the same time, the two connecting rods 302 are rotated to a mutually parallel state, at which time the two upper closing flaps 301 are in contact with the fixing portion 205 outside the expansion tube 2, and at the same time, the closing hole 306 and the closing pin 305 inside the upper closing flap 301 are closed, so as to realize the fixing of the lower closing flap 303 and the expansion tube 2;

[0047] Step (D), then peel off the catheter sheath 102, gently pull the tube seats 101 on both sides, and the tube seats 101 are separated because of the thin-walled structure at the connection. At the same time, the snap-fit ​​cap 104 is disengaged from the snap-fit ​​card 204, and the fixation with the expansion tube 2 is released. The separation of the two tube seats 101 will drive the catheter sheaths 102 connected to each other to separate along the thin wall until the catheter sheaths 102 are completely separated and pulled out of the patient's body, leaving the expansion tube 2, and the upper closing flap 301 and the lower closing flap 303 are separated respectively, and the connection with the expansion tube 2 is released to achieve disassembly, and then the electrode wire of the pacing pulse generator can be sent into the patient's body through the expansion tube 2.

[0048] The catheter sheath for cardiac surgery of the present invention is installed with a catheter sheath component 1, a fixing component 3 and an expansion tube 2. First, the cooperation between the catheter sheath component 1 and the expansion tube 2 realizes sealing when inserted into the patient's body to prevent blood from flowing out. At the same time, the fixing component 3 realizes that the two valves of the catheter sheath 102 separated at the same time when the catheter sheath 102 is peeled off will respectively abut on the outer lower closing valve 303 to limit the position of the opening. The abutting position is the connection between the two lower closing valves 303, and the lower closing valve 303 will not be expanded. In this way, the catheter sheath 102 can be easily withdrawn without the expansion tube 2 rebounding. The damping mechanism 4 ensures that the connecting rod 302 will not affect the insertion of the catheter sheath 102 during installation, and the operation is convenient.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A catheter sheath for cardiac surgery, used for inserting electrode wires in cardiac surgery, comprising a catheter sheath assembly (1), which comprises two symmetrically arranged tube seats (101), one end of the tube seat portion of the two tube seats being spliced ​​together is connected to a catheter sheath (102); the catheter sheath (102) and the tube seat portion are axially connected to form a cavity, and an expansion tube (2) is inserted therein, and the expansion tube (2) and the tube seat (101) are mutually buckled by buckle cards (204) and buckle caps (104) respectively arranged at the top ends of the two tube seats (101); thin walls are symmetrically arranged at the joint of the two tube seats (101) and inside the catheter sheath (102), and when the catheter sheath (102) is torn, the tube seat (101) and the catheter sheath (102) are split along the thin walls, characterized in that: The catheter sheath (102) is provided with a fixing component (3), which includes two symmetrically arranged lower closing flaps (303), and the lower closing flaps (303) are closed to form a connecting hole (307) to achieve connection with the catheter sheath (102); and a damping mechanism (4) is provided inside the single lower closing flap (303), and the damping mechanism (4) is externally connected to one end of a connecting rod (302), and the other end of the single connecting rod (302) is connected to an upper closing flap (301). When the lower closing flap (303) is fixed, the upper closing flap (301) is closed by rotating the two connecting rods (302) and connected to the expansion tube (2), so as to achieve the position of the fixed opening when the catheter sheath (102) is peeled off.

2. A catheter sheath for cardiac surgery according to claim 1, characterized in that: The sheath assembly (1) also includes a plug body placed inside the tube seat, the plug body includes a plurality of half-cut sealing plugs (107), and the sealing of the internal cavity of the sheath assembly (1) is achieved by squeezing and closing the gaps of the sealing plugs (107). The interior of the tube seat (101) is located above the sealing plugs (107) and is also provided with a foam (105) that has been cut in half and is used for lubrication when inserting the expansion tube (2).

3. A catheter sheath for cardiac surgery according to claim 1, characterized in that: A single tube seat (101) is provided with a snap-fitting piece (106), and the snap-fitting cap (104) is snap-fitted and connected thereto via snap-fitting openings (108) provided on both sides thereof. Any tube seat (101) is provided with an extension tube (103) that is in communication with the cavity.

4. A catheter sheath for cardiac surgery according to claim 1, characterized in that: Each lower closing flap (303) is provided with a rotation groove (304) inside. The damping mechanism (4) comprises a rotating rod (402) placed horizontally in the rotation groove (304) and a rotation hole (401) penetrating through one end of the single connecting rod (302). The connecting rod (301) is connected to the rotating rod (402) through the rotation hole (401). The outer side of the rotating rod (402) is provided with a plurality of grooves (403) in a circular array. The inside of the rotation hole (401) is provided with a plurality of convex strips (404) in a mirror-symmetrical manner. When the catheter sheath (102) and the expansion tube (2) are spliced, the convex strips (404) in the rotation hole (401) and the plurality of grooves (403) are alternately abutted against each other by rotating the connecting rod (302), so that the two connecting rods (302) rotate with damping, and at the same time, the upper closing flaps (301) connected to each other are driven to approach the expansion tube (2), and the two upper closing flaps (301) clamp the expansion tube (2).

5. A catheter sheath for cardiac surgery according to claim 4, characterized in that: The lower closing flap (303) and the upper closing flap (301) are each connected by plugging the closing pins (305) and the closing holes (306) symmetrically arranged on both sides to achieve closed splicing.

6. A catheter sheath for cardiac surgery according to claim 1, characterized in that: The expansion tube (2) is formed by splicing a tube body (203) and a fixing part (205), and the interior of both is a through structure. The buckle card (204) is placed outside the fixing part (205) and is plugged into the tube seat (101) and the catheter sheath (102) through the tube body (203).

7. A catheter sheath for cardiac surgery according to claim 6, characterized in that: A plurality of twisting portions (202) are symmetrically arranged on the outside of the fixing portion (205), the upper closing flap (301) is connected to the fixing portion (205), and a shielding portion (201) for abutting against the upper closing flap (301) is arranged on the outside of the fixing portion (205).

8. The catheter sheath for cardiac surgery according to claim 1, characterized in that: The tube seat (101) is manufactured using an in-mold injection molding process to achieve compatibility with the catheter sheath (102) during processing.

9. The catheter sheath for cardiac surgery according to claim 1, characterized in that: The thickness of the thin wall is 0.2mm-0.3mm.

10. A method for using a catheter sheath for cardiac surgery according to any one of claims 1 to 9, characterized in that: The following steps are included: Step (A), when in use, firstly, the two lower closing flaps (303) inside the fixing component (3) are spliced ​​with the catheter sheath (102), and the closing pin (305) is connected with the closing hole (306) to form a connecting hole (307) that fits and wraps around the outside of the catheter sheath (102) at a distance slightly farther than the position of the tube seat (101), and then the connecting rod (302) is rotated, and the rotation is achieved through the cooperation between the rotating hole (401) and the rotating rod (402). At the same time, during the rotation process, the convex strip (404) inside the rotating hole (401) will be connected with the groove (403) to provide damping. After the two rotating rods (402) are rotated to a relatively horizontal state, they are stationary, so that there is no obstruction at the front end when the catheter sheath (102) is subsequently inserted; Step (B), arranging a foam (105) coated with medical grade silicone oil on the inner wall of the cavity, Subsequently, the expansion tube (2) needs to be pre-inserted into the catheter sheath (102). By pre-coating the inside of the foam (105) with medical-grade silicone oil, the expansion tube (2) can be smoothly inserted into the inside of the catheter sheath (102) and passed through the sealing plug (107) located in the cavity. The sealing plug (107) cut in half is squeezed against each other to achieve sealing of the external contact of the catheter sheath (102). At the same time, the twisting part (202) is pinched to rotate the expansion tube (2) to achieve the positioning of the buckle card (204) and the buckle cap (104). Then, the expansion tube (2) and the catheter sheath (102) are inserted into the opening pre-opened in the patient's body, and the catheter sheath (102) and the expansion tube (2) are completely inserted into the patient's body. They are connected to the extension tube (103) through an external tool, and the excess air inside is extracted. Then, the catheter sheath (102) is prepared to be peeled off. Step (C), before peeling, the connecting rod (302) is rotated again, and the internal convex strips (404) of the rotating hole (401) thereof are alternately replaced with different grooves (403), so as to realize damping rotation, and at the same time, the two connecting rods (302) are rotated to a state parallel to each other, at which time the two upper closing flaps (301) are in contact with the fixing portion (205) on the outside of the expansion tube (2), and at the same time, the closing hole (306) and the closing pin (305) inside the upper closing flap (301) are closed, so as to realize the fixation of the lower closing flap (303) and the expansion tube (2); Step (D), then peel off the catheter sheath (102), pull the tube seats (101) on both sides, and separate the tube seats (101) because the connection is a thin-walled structure. At the same time, the buckle cap (104) is separated from the buckle card (204), and the fixation with the expansion tube (2) is released. The separation of the two tube seats (101) will drive the catheter sheaths (102) connected to each other to separate along the thin wall until the catheter sheaths (102) are completely separated and pulled out of the patient's body, leaving the expansion tube (2), and the upper closing valve (301) and the lower closing valve (303) are separated respectively, and the connection with the expansion tube (2) is released to achieve disassembly. Then, the electrode wire of the pacing pulse generator can be sent into the patient's body through the expansion tube (2).

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