Tightly-connected extracorporeal circulation catheter cannula

Abstract

The utility model relates to the technical field of extracorporeal circulation catheter cannulas, in particular to a tightly-connected extracorporeal circulation catheter cannula which comprises a catheter cannula body, a blood circulation pump arranged on the left side of the catheter cannula body, a flow expanding pipe connected to the catheter cannula body, a cannula connector connected to the flow expanding pipe, a connecting pipe and a circulating pipe arranged on the blood circulation pump, and a connecting pipe connected with the connecting pipe and the circulating pipe. A tight clamping groove is formed in the inserting pipe connector, a limiting check block is arranged on the connecting pipe, a threaded hole and a tight inserting groove are formed in the limiting check block, a tight screw pin is arranged in the threaded hole, an anti-loosening pressing head and a rotating handle block are arranged on the tight screw pin, a tight coating is arranged in the tight inserting groove, an arc face is arranged on the anti-loosening pressing head, and a buckling groove is formed in the rotating handle block. An end face sealing ring and an external sealing sleeve are arranged on the inserting pipe connector. The tight connectivity between the catheter cannula and the connecting pipe is improved, the catheter cannula is prevented from directly slipping off and being separated from the connecting pipe of the blood circulation pump, and the overall sealing performance between the catheter cannula and the connecting pipe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of extracorporeal circulation catheter cannula, in particular to a tightly connected extracorporeal circulation catheter cannula. Background Art

[0002] Extracorporeal circulation refers to the process of drawing blood out of the body, oxygenating and removing carbon dioxide through an artificial lung simulator, and then pumping it back into the body through a blood circulation pump. During the extracorporeal circulation process, catheter intubation is an indispensable tubular structure.

[0003] The catheter cannula used for extracorporeal circulation is generally directly connected to the connecting tube of the blood circulation pump. If it is pulled externally, the catheter cannula may slip and separate from the connecting tube of the blood circulation pump, which will affect the normal blood circulation operation of the extracorporeal circulation. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose a tightly connected extracorporeal circulation catheter cannula.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A tightly connected extracorporeal circulation catheter cannula is designed, comprising a catheter cannula, a blood circulation pump is provided on the left side of the catheter cannula, a flow expansion tube is connected to the catheter cannula, a cannula joint is connected to the flow expansion tube, and a connecting tube and a circulation tube are provided on the blood circulation pump;

[0007] The intubation joint is provided with a tight slot, the connecting pipe is provided with a limit block, the limit block is provided with a threaded hole and a tight slot, the threaded hole is provided with a tight screw pin, the tight screw pin is provided with an anti-loosening pressure head and a handle block, and the tight slot is provided with a tight coating;

[0008] The anti-loosening pressure head is provided with an arc surface, the handle block is provided with a buckle groove, and the intubation joint is provided with an end face sealing ring and an external sealing sleeve.

[0009] Furthermore, the intubation connector is a cylindrical tube body as a whole, and the intubation connector is squeezed and inserted into a tight slot.

[0010] Furthermore, the tight screw pin and the tight clamping groove form a group, which are two groups symmetrical up and down. The tight screw pin is threadedly connected to the threaded hole and clamped with the tight clamping groove.

[0011] Furthermore, the inner cavity of the expansion tube is arranged to diffuse toward the direction of the cannula joint, the external sealing sleeve is arranged on the outer wall of the cannula joint, and the end face sealing ring is arranged at the left end of the cannula joint. The external sealing sleeve and the end face sealing ring are both made of NBR nitrile rubber, which has excellent high elasticity, is waterproof, wear-resistant and durable.

[0012] Furthermore, the anti-loosening pressure head is arranged at the end portion of the tight screw pin, and the arc surface is evenly arranged along the outer corner of the anti-loosening pressure head. The anti-loosening pressure head is made of silicone rubber, has excellent high elasticity, is waterproof, wear-resistant and durable.

[0013] Furthermore, the handle block is a diamond-shaped structure as a whole, and the buckle grooves are arc-shaped inner grooves and are symmetrically arranged in four pieces. The fingers are inserted into the buckle grooves and rotated, and the thread transmission effect between the tight screw pin and the threaded hole can be achieved without using tools such as screwdrivers, which is very convenient.

[0014] Furthermore, the tight coating is evenly coated along the inner groove wall of the tight slot. The tight coating is an acrylic coating with a thickness of eighty to ninety microns. The acrylic coating has excellent waterproof performance and corrosion resistance. It is squeezed with the highly elastic external sealing sleeve to achieve extrusion sealing and leakage prevention.

[0015] The utility model provides a tightly connected extracorporeal circulation catheter cannula, which has the following beneficial effects:

[0016] 1. The utility model provides a cannula joint with a tight clamping groove on the catheter cannula, and provides a limit block with a tight clamping groove and a tight screw on the connecting pipe. When the catheter cannula is plugged and installed on the connecting pipe of the blood circulation pump, a symmetrical clamping and locking positioning is achieved. If the catheter cannula is pulled externally, the tight connection between the catheter cannula and the connecting pipe is improved, effectively preventing the catheter cannula from directly slipping off the connecting pipe of the blood circulation pump, thereby ensuring the normal blood circulation operation of the extracorporeal circulation.

[0017] 2. The utility model provides an end face sealing ring and an external sealing sleeve on the cannula joint. When the catheter cannula is plugged and installed on the connecting pipe of the blood circulation pump, the overall sealing between the catheter cannula and the connecting pipe is improved to prevent the leakage of flowing blood. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded view of the overall structure of the utility model;

[0019] Figure 2 This is a three-dimensional schematic diagram of the catheter cannula of the present invention being plugged into the connecting tube;

[0020] Figure 3 For the utility model Figure 1Schematic diagram of the three-dimensional catheter intubation;

[0021] Figure 4 For the utility model Figure 1 A partial enlarged view of the X in the middle;

[0022] Figure 5 For the utility model Figure 4 Schematic diagram of the three-dimensional tight screw.

[0023] In the figure: 1 catheter cannula; 11 expansion tube; 2 blood circulation pump; 21 connecting tube; 22 circulation tube; 3 cannula joint; 31 tight slot; 32 end face sealing ring; 4 external sealing sleeve; 5 limit block; 51 threaded hole; 6 tight screw pin; 61 anti-loosening pressure head; 611 arc surface; 62 handle block; 621 buckle groove; 7 tight slot; 71 tight coating. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Reference Figure 1-5 A tightly connected extracorporeal circulation catheter cannula comprises a catheter cannula 1, a blood circulation pump 2 is provided on the left side of the catheter cannula 1, a flow expansion tube 11 is connected to the catheter cannula 1, a cannula connector 3 is connected to the flow expansion tube 11, and a connecting tube 21 and a circulation tube 22 are provided on the blood circulation pump 2;

[0026] The intubation joint 3 is provided with a tight slot 31, the connecting pipe 21 is provided with a limit block 5, the limit block 5 is provided with a threaded hole 51 and a tight slot 7, a tight screw pin 6 is provided in the threaded hole 51, the tight screw pin 6 is provided with an anti-loosening pressure head 61 and a handle block 62, and a tight coating 71 is provided in the tight slot 7;

[0027] The anti-loosening pressure head 61 is provided with an arc surface 611, the handle block 62 is provided with a buckle groove 621, the cannula joint 3 is provided with an end face sealing ring 32 and an external sealing sleeve 4, the catheter cannula 1, the blood circulation pump 2, the circulation tube 22, and the connecting tube 21 are all related structures for blood circulation operations in extracorporeal circulation, which are existing technologies. Some existing structures are not drawn and marked, and there is no need to repeat them.

[0028] The intubation connector 3 is a cylindrical tube body as a whole, and the intubation connector 3 is squeezed and inserted into the tight slot 7. The intubation connector 3 and the connecting pipe 21 are both made of hard PVC material, which is wear-resistant and corrosion-resistant, does not deform, and can be drilled or tapped.

[0029] The tightening screw pin 6 and the tightening slot 31 form a group, which are two groups symmetrical in vertical direction. The tightening screw pin 6 is threadedly connected to the threaded hole 51 and is engaged with the tightening slot 31 .

[0030] The inner cavity of the expansion tube 11 is set to expand toward the cannula connector 3. When blood flows from right to left through the catheter cannula 1, the blood enters the expansion tube 11 and diffuses and flows into the connecting tube 21, further improving the expansion smoothness of the blood flow.

[0031] The external sealing sleeve 4 is arranged on the outer wall of the cannula connector 3, and the end face sealing ring 32 is arranged at the left end of the cannula connector 3. The external sealing sleeve 4 and the end face sealing ring 32 are both made of NBR nitrile rubber, which has excellent high elasticity, is waterproof, wear-resistant and durable. When the catheter cannula 1 and the connecting pipe 21 are tightly installed and connected, the external sealing sleeve 4 will be squeezed and contacted with the tight coating 71 for sealing. At the same time, the end face sealing ring 32 will also be squeezed and contacted with the inner groove wall of the tight slot 7 for sealing, thereby improving the overall sealing between the catheter cannula 1 and the connecting pipe 21.

[0032] The anti-loosening pressure head 61 is arranged at the end portion of the tight screw pin 6. The anti-loosening pressure head 61 is made of silicone rubber, has excellent high elasticity, is waterproof, wear-resistant and durable. When the tight screw pin 6 is inserted into the tight slot 31, the anti-loosening pressure head 61 itself will be in an extruded state and generate a vertical rebound force. The vertical rebound force acts on the tight screw pin 6 to prevent the tight screw pin 6 from loosening.

[0033] The arc surface 611 is evenly arranged along the outer corner of the anti-loosening pressure head 61 , and the arc surface 611 enables the anti-loosening pressure head 61 to be smoothly inserted into the tight clamping groove 31 .

[0034] The handle block 62 is a diamond-shaped structure as a whole, and the buckle grooves 621 are arc-shaped inner grooves and are symmetrically arranged in four pieces. The fingers are inserted into the buckle grooves 621 and rotated. It is not necessary to use tools such as screwdrivers to achieve the thread transmission effect between the tight screw pin 6 and the threaded hole 51, which is very convenient.

[0035] The tight coating 71 is evenly coated along the inner groove wall of the tight slot 7. The tight coating 71 is an acrylic coating with a thickness of eighty to ninety microns. The acrylic coating has excellent waterproof and corrosion resistance. It is squeezed with the highly elastic external sealing sleeve 4 to achieve extrusion sealing and leakage prevention.

[0036] Working method: align the cannula connector 3 on the catheter cannula 1 with the connecting tube 21 on the blood circulation pump 2, then squeeze the cannula connector 3 into the tight slot 7, then insert your finger into the buckle groove 621 and rotate it clockwise, driving the handle block 62 and the tight screw pin 6 to rotate clockwise, and through the threaded transmission of the threaded hole 51, drive the tight screw pin 6 to snap into the tight clamping groove 31, so that the tight installation and clamping connection between the catheter cannula 1 and the connecting tube 21 can be completed, and the upper and lower symmetrical clamping and locking positioning can be achieved. If the catheter cannula 1 is pulled to the right by the outside, it can effectively prevent the catheter cannula 1 from directly slipping off the connecting tube 21 of the blood circulation pump 2, thereby improving the tight connection between the catheter cannula 1 and the connecting tube 21, thereby ensuring the normal blood circulation operation of the extracorporeal circulation (wherein, the blood circulation operation principle of the extracorporeal circulation is the existing technology and need not be repeated).

[0037] In addition, when the catheter cannula 1 and the connecting tube 21 are tightly installed and snap-connected, the outer sealing sleeve 4 will be squeezed and contacted with the tight coating 71 for sealing. At the same time, the end face sealing ring 32 will also be squeezed and contacted with the inner groove wall of the tight slot 7 for sealing, thereby improving the overall sealing between the catheter cannula 1 and the connecting tube 21 and preventing leakage of flowing blood.

[0038] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tightly connected extracorporeal circulation catheter cannula, comprising a catheter cannula (1), characterized in that: A blood circulation pump (2) is provided on the left side of the catheter cannula (1), a flow expansion tube (11) is connected to the catheter cannula (1), a cannula joint (3) is connected to the flow expansion tube (11), and a connecting tube (21) and a circulation tube (22) are provided on the blood circulation pump (2); The intubation joint (3) is provided with a tight clamping groove (31), the connecting pipe (21) is provided with a limit block (5), the limit block (5) is provided with a threaded hole (51) and a tight slot (7), a tight screw pin (6) is provided in the threaded hole (51), an anti-loosening pressure head (61) and a handle block (62) are provided on the tight screw pin (6), and a tight coating (71) is provided in the tight slot (7); The anti-loosening pressure head (61) is provided with an arc surface (611), the handle block (62) is provided with a buckle groove (621), and the intubation joint (3) is provided with an end face sealing ring (32) and an external sealing sleeve (4).

2. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The intubation joint (3) is a cylindrical tube body as a whole, and the intubation joint (3) is squeezed and inserted into the tight slot (7).

3. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The tight screw pin (6) and the tight clamping groove (31) form a group, which are two groups symmetrical in vertical direction. The tight screw pin (6) is threadedly connected to the threaded hole (51) and is clamped to the tight clamping groove (31).

4. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The inner cavity of the expansion pipe (11) is arranged to expand toward the direction of the cannula joint (3), the outer sealing sleeve (4) is arranged on the outer wall of the cannula joint (3), and the end face sealing ring (32) is arranged at the left end of the cannula joint (3).

5. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The anti-loosening pressure head (61) is arranged at the end portion of the tight screw pin (6), and the arc surface (611) is evenly arranged along the outer corner of the anti-loosening pressure head (61).

6. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The handle block (62) is a diamond-shaped structure as a whole, and the buckle grooves (621) are arc-shaped inner grooves and are four symmetrically arranged.

7. The tightly connected extracorporeal circulation catheter cannula according to claim 1, characterized in that: The tight coating (71) is evenly coated along the inner groove wall of the tight slot (7), and the tight coating (71) is an acrylic coating with a thickness of 80 to 90 microns.

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