A blood cannula assembly for cattle

Abstract

The present invention discloses a blood cannula assembly for cattle, comprising an introduction tube that can puncture a blood vessel wall, the introduction tube having a barrel body that can accommodate a catheter passing therethrough; the tail end of the catheter is connected to a connector, the other end of the connector is connected to a three-way joint, and foreign substances are introduced into the catheter through the connector through the three-way joint; the catheter located outside the body surface is fixed to the body surface of the cattle through a body surface fixing clamp. The present invention is specifically aimed at solving the problems of high test costs, difficulty in purchasing, and high technical requirements caused by the use of human medical materials as substitutes in existing test processes with a blood cannula assembly for cattle; the introduction tube, catheter, connector, three-way joint, and body surface fixing clamp provided in the present invention are a series of matching components that solve the problem of difficulty in finding suitable connecting devices and fixing devices in existing tests due to the use of human medical materials as substitutes, and the various components cooperate well to reduce the difficulty and cost of the experiment.

Description

Technical Field

[0001] The invention relates to the technical field of livestock medical treatment, in particular to a blood cannula assembly for cattle, which is suitable for a blood vessel perfusion test of cattle. Background Art

[0002] The nutritional metabolism of animals is a dynamic process that is constantly changing. Blood cannulation technology has unique advantages in studying the dynamic process of nutritional metabolism. By placing a permanent blood cannula in a blood vessel at a certain part of the animal's body, continuous blood sampling or the input of metabolic intervention substances can be achieved, and the metabolic dynamics of the animal's body can be effectively monitored. The external pudendal arteries on both sides of the animal's mammary gland are the main arteries that provide blood flow to the mammary glands of lactating animals such as sheep, goats, and cows. The external pudendal arteries on both sides provide arterial blood to the ipsilateral mammary gland. In order to avoid the influence of the rumen in the process of studying the nutritional uptake mechanism of bovine mammary glands, the external pudendal artery blood cannulation technology plays a vital role.

[0003] In the past, when conducting bovine vascular perfusion tests, there were no blood cannulation devices suitable for cattle on the market. Therefore, in previous bovine vascular perfusion tests, the blood cannulation materials were replaced by human central venous catheters (PICC) and the extracorporeal catheters were fixed to the body surface with Silolock. However, these two types of medical materials for humans are too expensive and difficult to purchase, and their replacement results in high test costs. In addition, the human blood cannulation materials have the problem that the catheter is too soft and difficult to insert. The vascular layout of cattle is somewhat different from that of humans. In actual operation, the size of human central venous catheters cannot be completely matched, which places certain requirements on the skills of the test operators and increases the difficulty of the experiment.

[0004] In summary, for the current bovine vascular perfusion experiments, a blood cannula assembly suitable for cattle is needed to facilitate catheter placement and catheter fixation. Summary of the invention

[0005] Based on the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a blood cannula assembly for cattle, which has a simple structure, reasonable design, good safety, easy introduction, easy fixation, good connection effect, and is not easy to fall off. It can solve the problem that there is no matching vascular catheter assembly in the current bovine vascular perfusion test.

[0006] To achieve the above purpose, the present invention adopts the following technical measures:

[0007] A blood cannula assembly for cattle comprises an introduction tube capable of piercing a blood vessel wall, the introduction tube having a tube body capable of accommodating a catheter passing therethrough; a connector is connected to the tail end of the catheter, the other end of the connector is connected to a three-way joint, and foreign substances are introduced into the catheter through the connector via the three-way joint; the catheter located outside the body surface is fixed on the body surface of the cattle via a body surface fixing clamp.

[0008] Preferably, a snap connector is provided at the tail end of the catheter, a hook connector is provided inside the end of the connector connected to the catheter, and the snap connector extends into the interior of the connector to be snap-fitted and connected with the hook connector.

[0009] Furthermore, one end of the connector connected to the catheter is provided with an elastic silicone ring tightly connected to the outer wall of the catheter.

[0010] Optionally, the three-way joint includes a channel body, a rotating body embedded in the channel body and rotating relative to the channel body, the channel body has three channels extending radially outward from its interior, and the outer wall of the rotating body is provided with three small holes connected to its interior, and when two of the small holes are aligned with the two channels on the channel body, the two channels are connected to achieve material flow.

[0011] Furthermore, a knob switch is fixed to the end of the rotating body outside the channel body, and the connection between the channels of the three-way joint is controlled by adjusting the position of the small hole in the channel body through the knob switch.

[0012] Optionally, a double-leaf joint is provided at one end of the connector connected to the three-way joint, a screw cap is provided on the channel of the three-way joint, and the double-leaf joint and the screw cap are threadedly connected to connect the connector to the three-way joint.

[0013] Furthermore, the body surface fixing clamp includes a columnar body, two fixing claws installed on the columnar body and arranged relatively and rotatably, and two pressing plates connected to the fixing claws and controlling the opening and closing size of the two fixing claws; the interior of the columnar body has a catheter through hole for the catheter to pass through; a spring is connected between the inner sides of the two pressing plates to keep the two fixing claws in a closed state.

[0014] Furthermore, the outer side surface of one fixing claw and the inner side surface of the other fixing claw are both provided with ladder-shaped tooth buckles.

[0015] Optionally, the barrel is a smooth hollow structure, and the tail end of the barrel is provided with a handle, and the handle is made of plastic and has anti-slip grooves.

[0016] The above scheme is beneficial in that when conducting an external pudendal artery perfusion test, the introduction tube plays a guiding role in the insertion of the catheter. When placing the blood cannula, after the tip of the introduction tube pierces the blood vessel, the catheter is inserted into the blood vessel through the inside of the introduction tube, thereby improving the efficiency of blood vessel insertion in the test. The body of the introduction tube is hollow, the front end is a tip that can pierce the blood vessel wall, and the tail end is provided with a handle. After the tip of the introduction tube pierces the blood vessel, the introduction tube is pushed into the blood vessel, and the catheter is sent into the blood vessel from the body of the introduction tube. The handle is provided with anti-slip grooves to prevent sliding during the pushing of the introduction tube and the catheter. The tail end of the catheter is provided with a snap connector. After the catheter is placed in the blood vessel, the tail end of the catheter remains outside the body. Compared with the catheter bayonet connector, the material is harder to prevent deformation when buckled with the connector, thereby causing a gap in the connection and loosening.

[0017] The three-way connector is provided with three channels and a knob switch, and the three channels can be connected by the knob switch. The connection end of the connector is provided with a double-leaf connector, and the double-leaf connector is inserted into the channel opening of the three-way connector and the screw cap is rotated, and the blades can clamp the screw cap to screw the three-way connector and the double-leaf connector. The catheter left outside the body passes through the catheter through hole on the surface fixing clamp, and the fixing claw can firmly buckle the cow's skin, thereby fixing the external part of the catheter on the surface of the body.

[0018] In the past, it was difficult to find suitable in vivo blood cannulation materials and accessory sizes during the bovine blood vessel perfusion test. Human central venous catheters (PICC) were often used instead. During the introduction process, human medical materials such as skin dilators were used. The components were complicated, expensive, and difficult to obtain. The present invention provides a special introduction tube with a simple structure and easy operation. After finding the blood vessel position required for cannulation during the operation, the introduction tube is aligned with the blood vessel and inserted obliquely. The tube body can be used as a catheter channel to play a good auxiliary role in the cannulation process, and the catheter can be quickly and smoothly placed in the target blood vessel.

[0019] In previous tests, human medical materials were used and there was no need to consider the connection with the outside world after the catheter was inserted. Therefore, the catheter and external instruments were connected with a needle. However, since the sizes of the needle and the catheter did not match perfectly, they often fell off or leaked during perfusion.

[0020] The connector, the joint with groove, the silicone ring, and the double-leaf joint provided by the present invention are key components that can solve the problem of connecting the catheter to the external perfusion instrument after insertion in previous experiments. After the blood cannulation is placed, the buckle connector at the tail end of the catheter has its own groove that matches the hook connector on the connector. When in use, the tail end of the catheter is inserted into the connector, and the groove of the buckle connector at the tail end of the catheter is buckled with the hook connector inside the connector. The high-elastic silicone ring at the top of the hook connector fits tightly with the catheter to reinforce the connection between the catheter and the catheter. The double-leaf joint at the tail end of the connector is provided with two blades. After the double-leaf joint is inserted into the channel opening of the three-way joint, the screw cap on the three-way joint is tightened until the screw cap and the blades are buckled. From then on, the connection sequence of the in vivo catheter-connector-three-way joint can be formed. The three-way joint is used as a switch connected to the external instrument. It relies on the small hole on the rotating body of the three-way joint. When the knob switch is rotated, the small hole can be driven to rotate between the channel openings. When the small hole is aligned with the two channel openings on the channel opening, the two channels are connected and the material can flow.

[0021] In cattle vascular perfusion tests, there is usually a section of spare catheter that needs to be fixed on the body surface because external instruments need to be connected. In previous tests, medical dressings and medical tapes were often used for surface fixation. However, the replacement of medical dressings requires certain operating skills, which increases the difficulty of postoperative care in the test and is relatively expensive. Medical tapes are not sticky enough and are easily loosened. In order to solve many problems encountered in surface fixation in previous tests, the body surface fixing clamp provided in the present invention is one of the key components. The body surface fixing clamp is provided with a catheter through hole. When in use, it is only necessary to pass the extracorporeal part of the catheter through the catheter through hole, and then apply force to the pressing plate to control the opening and closing degree of the left and right fixing claws. After determining the surface fixing position, the pressing plate is released, and the left and right fixing claws are closed under the action of the spring. The left and right fixing claws are provided with ladder-shaped tooth buckles, which can be tightly fastened after piercing the cattle's skin to prevent the fixing claws from loosening and falling during the cattle's activities, thereby ensuring that the extracorporeal part of the catheter is fixed.

[0022] Compared with the prior art, the beneficial effects and advantages of the cattle blood cannula assembly of the present invention are:

[0023] 1. The present invention is specifically aimed at the blood cannula assembly for cattle to solve the problems of high test cost, difficulty in purchase and high technical requirements caused by the use of human medical materials as substitutes in the existing test process.

[0024] 2. The invention provides a series of supporting components including an introduction tube, a catheter, a connector, a three-way joint, and a body surface fixing clamp to solve the problem of difficulty in finding suitable connecting devices and fixing devices in existing experiments due to the use of human medical materials as substitutes. The various components cooperate well, reducing the difficulty and cost of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the introduction tube of the present invention;

[0027] Figure 2 is a schematic structural diagram of a catheter of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the connector of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the three-way connector of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the body surface fixing clip of the present invention;

[0031] Figure 6 for Figure 5 Top view of the .

[0032] Among them: 1 - introduction tube, 2 - catheter, 3 - connector, 4 - three-way connector, 5 - body surface fixing clamp, 6 - handle, 7 - barrel, 8 - snap connector, 9 - hook connector, 10 - elastic silicone ring, 11 - double-leaf connector, 12 - knob switch, 13 - screw cap, 14 - small hole, 15 - spring, 16 - pressing plate, 17 - fixing claw, 18 - ladder-shaped tooth buckle, 19 - catheter through hole. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] See below Figure 1-Figure 6 The blood cannula assembly for cattle of the present invention is described in detail.

[0035] like Figure 1-6 As shown, the blood cannula assembly for cattle provided by the present invention comprises an introduction tube 1 capable of piercing a blood vessel wall, and the introduction tube 1 has a barrel 7 capable of accommodating a catheter 2 to pass through. The barrel 7 is a smooth hollow structure, and a handle 6 is provided at the rear end of the barrel 7, and the handle 6 is made of plastic and has anti-slip patterns. The front end of the introduction tube 1 is a puncture end, and the puncture end can puncture a blood vessel wall.

[0036] The tail end of the catheter 2 is connected with a connector 3, and the other end of the connector 3 is connected with a three-way joint 4, and foreign substances are passed into the catheter 2 through the connector 3 through the three-way joint 4. The front end of the catheter 2 is the insertion end, and the tail end is the connection end. The tube body of the catheter at the insertion end is smooth and made of medical PVC material. The connection end of the tail end is provided with a snap connector 8, which is made of plastic material and fixed to the tail end of the catheter 2. A hook connector 9 is provided inside the end of the connector 3 connected to the catheter 2. The hook connector 8 extends into the interior of the connector 3 and is snap-fitted with the hook connector 9, and the hook connector 9 is snap-fitted with the groove outside the snap connector 8 to form a concave-convex bite to connect the catheter 2 and the connector 3.

[0037] In addition, one end of the connector 3 connected to the catheter 2 is provided with an elastic silicone ring 10 tightly connected to the outer wall of the catheter 2, and the elastic silicone ring 10 fixes the tail end of the catheter 2 again to achieve a sealed connection between the connector 3 and the catheter 2. The connector 3 is made of plastic material and is in the shape of a hollow hourglass. One end is a hook connector 9, which is matched with the groove of the buckle connector 8 at the tail end of the catheter 2. The buckle connector 8 at the tail end of the catheter 2 is inserted into the hook connector 9 to form a buckle connection.

[0038] The three-way joint 4 includes a channel body, a rotating body embedded in the channel body and rotating relative to the channel body, the channel body has three channels extending radially outward from its interior, and the outer wall of the rotating body is provided with three small holes 14 connected to its interior, and when two of the small holes are aligned with the two channels on the channel body, the two channels are connected to realize the flow of materials. A knob switch 12 is fixed to the end of the rotating body outside the channel body, and the position of the small hole 14 in the channel body is adjusted by the knob switch 12 to control the connection between the channels of the three-way joint 4. A double-leaf joint 11 is provided at one end of the connector 3 connected to the three-way joint 4, and a screw cap 13 is provided on the channel of the three-way joint 4. The double-leaf joint 11 is threadedly connected with the screw cap 13 to connect the connector 3 to the three-way joint 4. The two leaves of the double-leaf joint 11 match the threads inside the screw cap 13 provided on the three-way joint 4 and can be inserted into the screw cap 13. Rotating the screw cap 13 makes the screw cap 13 fit with the two leaves of the double-leaf joint 11, and strengthens the connection between the channel and the double-leaf joint 11. After tightening the screw cap 13 , the connector 3 and the three-way connector 4 form a tightly closed connection.

[0039] The catheter located outside the body surface is fixed on the body surface of the cow by a body surface fixing clamp 5. The body surface fixing clamp 5 includes a columnar body, two fixing claws 17 that are relatively arranged and rotatably mounted on the columnar body, and two pressing plates 16 connected to the fixing claws 17 and controlling the opening and closing size of the two fixing claws 17, wherein the interior of the columnar body has a catheter through hole 19 for the catheter 2 to pass through. A spring 15 is connected between the inner side surfaces of the two pressing plates 16 to keep the two fixing claws 17 in a closed state. The outer side surface of one fixing claw 17 and the inner side surface of the other fixing claw 17 are both provided with a ladder-shaped tooth buckle 18. When no external force is applied, the fixing claw 17 is closed, and the ladder-shaped tooth buckle 18 bites each other. When a force is applied to the pressing plate 16, the size of the opening and closing of the fixing claw 17 can be adjusted by overcoming the elastic force of the spring 15. After the fixing claw 17 passes through the surface skin of the cow, it is fixed on the body surface by the buckling of the ladder-shaped tooth buckle 18. Due to the elasticity of the spring 15, the fixing claws 17 are in a closed state in the natural state, and the ladder-shaped tooth buckle 18 is engaged and fastened. When in use, the external catheter part passes through the catheter through hole 19 on the body surface fixing clamp 5, and the opening and closing degree of the two fixing claws 17 is adjusted by the pressing plate 16. After the body surface fixing position is determined, the pressing plate 16 is released to close the fixing claws, so that the external part of the catheter can be fixed at the required position and is not easy to fall off.

[0040] like Figure 1 As shown, after the puncture end of the introduction tube 1 of the present invention punctures the blood vessel wall, the operator holds the handle 6 on the tube body 7, tilts the introduction tube 1 about 30 degrees, and slowly inserts the tube body 7 into the blood vessel. After the introduction tube 1 is tilted and inserted into the blood vessel, the operator holds the handle 6 of the introduction tube 1 with one hand to fix the introduction tube 1, and slowly inserts the catheter 2 into the introduction tube 1 with the other hand. While inserting the catheter 2, the introduction tube 1 is slowly withdrawn until the catheter 2 is inserted into the blood vessel about 10-15 cm, and then the introduction tube 1 is quickly withdrawn, and the step of inserting the catheter 2 into the blood vessel is completed.

[0041] Embodiment 2:

[0042] The cow is placed in the external pudendal artery cannulation. Before the catheter is placed, the catheter 2 and the connector 3 are connected, and the buckle connector 8 at the tail end of the catheter 2 is inserted into the hook connector 9 of the connector 3, ensuring that the hook connector 9 of the connector 3 and the buckle connector 8 at the tail end of the catheter 2 are fastened and not loose, and the catheter 2 is inserted into the catheter through hole 19 of the body surface fixing clamp 5. Connect the connector 3 and the three-way connector 4, insert the double-leaf connector 11 into the channel opening of the three-way connector 4, rotate the screw cap 13 of the three-way connector 4 until it is tightened, rotate the knob switch 12 of the three-way connector 4, and after the connection end of the catheter and the injection channel opening are connected, inject heparin sodium into the three-way connector 4 to check whether each connection is airtight. After the inspection is completed, continue to inject heparin sodium into the catheter until the catheter is filled with heparin sodium, then close the channel of the three-way connector and place the catheter.

[0043] For dairy cows, the hair is cut at the soft triangle about 5 cm below the lateral angle of the ilium, 3 cm to 5 cm behind the lateral angle of the ilium. After cleaning, disinfect with 5% iodine, deiodinate with 75% alcohol, and inject local anesthetic procaine. After 2 minutes, put one hand into the anus of the cow and touch the artery as thick as the little finger in the intestine. Gently clamp it with your fingers. Use the other hand to find the corresponding position on the outside and insert the introduction tube 1. Slowly insert the needle about 15 cm. At this time, the hand holding the blood vessel can feel a slight squeeze. After the introduction tube 1 is aligned with the position, it punctures the blood vessel wall and bright red blood spurts out. At this time, quickly send the catheter 2 into the barrel 7 of the introduction tube 1, insert the catheter 2 while slowly withdrawing the introduction tube 1. When the catheter 2 is inserted into the blood vessel about 10-15 cm, quickly withdraw the introduction tube 1. When the introduction tube 1 is withdrawn from the body, pay attention to press and fix the catheter at the puncture port to prevent the catheter 2 from being withdrawn together with the introduction tube 1. After the introduction tube is withdrawn from the tail end of the catheter, the connector and the tail end of the catheter are immediately connected, and the tail end of the catheter is inserted into the hook connector 9. The elastic rubber ring 10 at the top of the hook connector is tightly fitted to the interface between the tail end of the catheter and the connector. The connector and the catheter pass through the catheter through hole 19 of the body surface fixing clamp together, connect the three-way connector and the double-leaf connector 11, insert the leaf into the double connector 11 at the channel opening of the three-way connector 4, rotate the screw cap 13 of the three-way connector 4 until it is tightened, and rotate the knob switch 12 of the three-way connector 4. Bring the fixing claw 7 of the body surface fixing clamp 5 close to the surface skin of the cow, pierce the epidermis, operate the pressing plate 16 to adjust the degree of buckling of the ladder-shaped tooth buckle 8 on the fixing claw 7, and ensure that it is firmly grasped on the surface of the cow and does not loosen. Turn on the switch of the three-way connector 4 and inject sodium heparin. Within 24 hours after the operation, inject an appropriate amount of sodium heparin into the blood vessel through the three-way connector 4 every 2 hours to ensure that the catheter is unobstructed, and check whether the catheter is loose. Catheter blockage is a problem that requires constant attention during the entire perfusion test. Therefore, sodium heparin should be injected every 2 hours within 24 hours after the operation to ensure the patency of the catheter and check whether the catheter position is loose.

[0044] This experiment sets a 3-day postoperative recovery period. During this period, you need to pay attention to whether the catheter is loose. 100 IU sodium heparin needs to be injected every 2 hours for 24 hours after the operation, and then it can be injected every 6 hours depending on the situation. During the formal perfusion period, the catheter needs to be pre-flushed and cleaned with saline before and after perfusion. Sodium heparin is injected every 6 hours during the entire experiment. Thereafter, attention should be paid to the disinfection of the puncture site and the catheter outside the body surface during the experiment. The puncture site should be disinfected with iodine and alcohol three times each morning and evening. The external part of the catheter should also be disinfected during disinfection. The three-way connector and transparent dressing should be replaced once a week. Sodium heparin is injected every 2 hours within 24 hours after this operation. In the specific operation, the concentration and frequency of sodium heparin injection should be appropriately adjusted according to the vascular conditions of the cattle.

[0045] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be understood by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the scope of the present invention.

Claims

1. A blood cannula assembly for cattle, comprising an introduction tube (1) capable of piercing a blood vessel wall, characterized in that: The introduction tube (1) has a tube body (7) that can accommodate the catheter (2) passing through; the tail end of the catheter (2) is connected to a connector (3), and the other end of the connector (3) is connected to a three-way joint (4), and foreign substances are introduced into the catheter (2) through the connector (3) through the three-way joint (4); the catheter located outside the body surface is fixed on the body surface of the cow through a body surface fixing clamp (5); the tail end of the catheter (2) is provided with a snap connector (8), and the end of the connector (3) connected to the catheter (2) is provided with a snap connector (9), and the snap connector (8) extends into the interior of the connector (3) and is snap-connected with the snap connector (9); the end of the connector (3) connected to the catheter (2) is provided with a snap connector (9) The outer wall of the catheter (2) is tightly connected to an elastic silicone ring (10); the body surface fixing clamp (5) comprises a columnar body, two fixing claws (17) relatively arranged and rotatably mounted on the columnar body, and two pressing plates (16) connected to the fixing claws (17) and controlling the opening and closing size of the two fixing claws (17); the interior of the columnar body is provided with a catheter through hole (19) for the catheter (2) to pass through; a spring (15) is connected between the inner sides of the two pressing plates (16) for keeping the two fixing claws (17) in a closed state; the outer side of one fixing claw (17) and the inner side of the other fixing claw (17) are both provided with ladder-shaped tooth buckles (18); the fixing claws (17) can pierce the cow's epidermis.

2. The blood cannula assembly for cattle according to claim 1, characterized in that: The three-way joint (4) comprises a channel body, a rotating body embedded in the channel body and rotating relative to the channel body, the channel body has three channels extending radially outward from its interior, the outer wall of the rotating body is provided with three small holes (14) communicating with its interior, and when two of the small holes are aligned with the two channels on the channel body, the two channels are connected to realize the flow of substances.

3. The blood cannula assembly for cattle according to claim 2, characterized in that: A knob switch (12) is fixed to the end of the rotating body outside the channel body, and the connection between the channels of the three-way joint (4) is controlled by adjusting the position of the small hole (14) in the channel body through the knob switch (12).

4. The blood cannula assembly for cattle according to claim 3, characterized in that: One end of the connector (3) connected to the three-way connector (4) is provided with a double-leaf connector (11), a screw cap (13) is provided on the channel of the three-way connector (4), and the double-leaf connector (11) and the screw cap (13) are threadedly connected to connect the connector (3) to the three-way connector (4).

5. The blood cannula assembly for cattle according to claim 1, characterized in that: The barrel (7) is a smooth hollow structure. The tail end of the barrel (7) is provided with a handle (6). The handle (6) is made of plastic and has anti-slip patterns.

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