Venous cannula for cardiac surgery

Abstract

The invention provides a cardiac surgery venous cannula, and relates to the technical field of medical equipment. Comprising a venous cannula body, the outer side of the venous cannula body is sleeved with a connecting pipe, the middle position of the connecting pipe is fixedly connected with a flow control mechanism, the outer side of the flow control mechanism is sleeved with an auxiliary heating mechanism, and the two ends of the auxiliary heating mechanism are tightly attached to the surface of the connecting pipe. The flow control mechanism is arranged, a connecting shaft is driven to rotate through a shaft cover, at the moment, a limiting strip is movably meshed through sawteeth, an extension spring is obliquely stretched, meanwhile, the two sides of an adjusting rod push the venous cannula body to rotate in an S shape, and when the rotating amplitude of the adjusting rod is larger, the torque of the venous cannula body is larger, and the flow is smaller; the injection rate can be conveniently adjusted, the situation that the injection rate is not accurately adjusted through the pushing speed during injection, and a patient is possibly injured again is avoided, and meanwhile operation is convenient.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and more particularly to a cardiac surgical venous cannula. Background Art

[0002] Heart disease is the number one killer of human health. With the continuous development of medical technology, in addition to pursuing good surgical results, the industry also hopes to reduce surgical risks to a minimum, and also consider the aesthetics of the wound after healing. Like other fields, cardiac surgery has also become an inevitable trend to develop in the direction of minimally invasive surgery. Superior vena cava catheterization can assist in minimally invasive cardiac surgery.

[0003] For example, the publication number is CN 208823722 U, and the name is: A venous cannula for cardiac surgery, wherein a first protective sleeve is installed at one end of an outer sleeve, and a second protective sleeve is installed at the other end of the outer sleeve, so that the inner catheter can be protected by the first protective sleeve and the second protective sleeve. By providing a movable groove on the outside of the balloon and a plug with a fixed sleeve on one side of the balloon, the balloon can be compressed by the plug, thereby inflating the inflation chamber. The device has the characteristics of diverse functions and more convenient use.

[0004] In actual use, when performing manual intravenous injections on patients, medical staff need to manually control the flow rate. Due to manual control, there will still be a certain difference in the flow rate. Secondly, before the injection, the intravenous tube needs to be fixed to the patient's body. The existing method is to stick it directly. Long-term sticking will cause the viscosity to fail or a single fixing method will cause the needle to fall off as the patient turns over. Moreover, when the temperature difference between the injected liquid and the patient's body is large, it is easy to affect the patient's comfort. Summary of the invention

[0005] In view of the existing problems in the prior art, when performing manual intravenous injection on patients, medical staff need to manually control the flow rate. Due to manual control, there will still be a certain difference in the flow rate. Secondly, before the injection, the intravenous tube needs to be fixed to the patient's body position. The existing method directly uses pasting. Long-term pasting will cause viscosity failure or a single fixing method, which will cause the needle to fall off as the patient turns over. Furthermore, when the temperature difference between the injected liquid and the patient's body is large, it is easy to affect the patient's mood. The purpose of the present invention is to provide a feeding device for a cold-rolled ribbed steel bar production line.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A cardiac surgical venous cannula comprises a venous cannula body, a connecting tube is sleeved on the outside of the venous cannula body, a flow control mechanism is fixedly connected to the middle position of the connecting tube, an auxiliary heating mechanism is sleeved on the outside of the flow control mechanism, and both ends of the auxiliary heating mechanism are tightly attached to the surface of the connecting tube, an operating table is fixedly connected to the outside of the connecting tube, and a plurality of air holes are provided on the surface of the operating table, an extension patch is fixedly connected to the bottom end of the operating table, and an adhesive layer is fixedly connected to the bottom end of the extension patch, a protective film is pasted to the bottom end of the adhesive layer, a placement groove is fixedly connected to one side of the operating table, and a group of left-right symmetrical fixing blocks are fixedly connected to the side of the operating table away from the placement groove, and a limiting groove is provided at the top of the fixing block, and the auxiliary fixing mechanism is movably connected inside the limiting groove.

[0008] Optionally, the flow control mechanism includes a sleeve, a connecting shaft, a control shaft, a limit block, a pull rope and a reset spring. The bottom end of the connecting shaft extends to the interior of the sleeve. A connecting groove is provided inside the connecting shaft, and the connecting groove passes through the connecting shaft horizontally. A group of left-right symmetrical movable grooves are provided inside the connecting shaft, and the movable grooves are located on both sides of the middle position of the connecting groove. The control shaft vertically passes through the connecting shaft and extends to the inside of the connecting groove. The limit block is adapted to the connecting groove and is respectively slidably connected to the two ends of the connecting groove. One end of the pull rope is fixedly connected to the opposite side of the limit block, and the other end of the pull rope is fixedly connected to the outside of the control shaft. The reset spring is sleeved on the outside of the pull rope. The bottom end of the control shaft is fixedly connected to the moving block, and the moving block extends to the inside of the movable groove.

[0009] Optionally, the top end of the connecting shaft is fixedly connected to a shaft cover, and the connecting shaft passes through the shaft cover and extends to its top end, the bottom end of the connecting shaft is fixedly connected to two obliquely symmetrical adjustment rods, the sleeve is fixedly connected to the middle position of the operating table, the opposite sides of the connecting tube are connected to the inside of the sleeve, and the venous catheter body is located on the opposite side of the adjustment rod.

[0010] Optionally, a gear ring is fixedly connected to the inside of the sleeve, serrations are provided on the outside of the limit block, and the limit block is clamped with the gear ring through the serrations, and two obliquely symmetrical tension springs are fixedly connected to the outside of the connecting shaft, and the other end of the tension spring is fixedly connected to the inner wall of the sleeve.

[0011] Optionally, the auxiliary fixing mechanism includes a control rod, a strap, a torque spring and a pull rod, the strap is wrapped around the outside of the control rod, and the pull rod is fixedly connected to the other end of the strap, the torque spring is respectively fixedly connected to both ends of the pull rod, and both ends of the pull rod are respectively provided with a slot.

[0012] Optionally, both ends of the control rod are movably connected to the inside of the placement slot via bearings, and one end of the torque spring away from the control rod is fixedly connected to the inner wall of the placement slot, one end of the strap passes through the placement slot and the extension patch in turn and extends to the outside thereof, and the pull rod is located on the outside of the extension patch.

[0013] Optionally, the clamping slot is matched with the limiting slot, the pull rod is clamped with the fixing block through the limiting slot, and the binding strap forms a pull rope releasing and recovering structure through the control rod and the torque spring.

[0014] Optionally, the auxiliary heating mechanism includes a ring, a connecting strip, a connecting cover and a heating rod, the connecting strips are provided with two and are fixedly connected to the bottom end of the ring, the connecting covers are respectively fixedly connected to the bottom ends of the connecting strips, and the heating rods are provided with several and are fixedly connected to the inside of the connecting covers.

[0015] Optionally, the connecting cover is arc-shaped and matched with the outer side of the connecting pipe, the collar is sleeved on the outer side of the sleeve, and the connecting strips are located on both sides of the sleeve.

[0016] Optionally, a magnet is fixedly connected to the outside of the connecting pipe, a magnet is fixedly connected to the inside of the connecting cover, and the magnetic poles of the magnets located on the connecting pipe and the inside of the connecting cover are arranged oppositely.

[0017] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0018] In the above scheme, the flow control mechanism is set up, and the connecting shaft is driven to rotate through the shaft cover. At this time, the limit bar is engaged by the sawtooth movement, and the tension spring is stretched obliquely. At the same time, the two sides of the adjusting rod push the intravenous cannula body to rotate in an S shape. At the same time, the greater the rotation amplitude of the adjusting rod, the greater the torque of the intravenous cannula body and the smaller the flow rate. At the same time, when the control shaft is pressed downward, the moving block slides downward inside the movable groove, and at the same time, the bottom end of the control shaft pulls the pull rope downward so that the other end of the pull block pulls the limit block to be located inside the connecting groove. At this time, the limit block is released from the limit on the tooth ring, and at the same time, the tension spring reacts to reset the control shaft. At this time, the rotation of the adjusting rod releases the speed limit on the flow rate of the intravenous cannula body, which is beneficial to adjusting the injection rate and avoiding inaccurate adjustment of the injection rate by pushing speed during injection, which may cause further injury to the patient and is convenient for operation.

[0019] Through the auxiliary fixing mechanism, the strap is pulled out to one side by holding the pull rod, and then the strap is wrapped around the fixed position for one circle. When the strap is pulled, the control rod pulls one end of the strap to rotate. At this time, the torque spring contracts and the axis is tightened. At this time, the pull rod slot is pressed downward on the limit slot so that the pull rod is connected to the top of the fixed block. When disassembly is required, the pull rod is pulled out from the top of the fixed block and the strap is slowly loosened. At this time, the torque spring reacts on the control rod, causing it to rotate in the opposite direction and rotate the reeled strap at the same time, which is beneficial to enhance the fixing stability of the equipment and prevent the single fixing method from causing the equipment to fall off when the patient turns over or other movements, thereby requiring needle injection again, which increases the patient's psychological pressure.

[0020] By setting up an auxiliary heating mechanism, the ring is aligned with the outside of the sleeve, and the magnets are aligned at the same time. The magnetic poles are attracted to each other so that the connecting cover is adsorbed on the outside of the connecting tube. At the same time, the external power supply and the heating rod generate heat, which is beneficial to heating the liquid flowing through the venous catheter body inside the connecting tube, avoiding the large stability gap between the medicine and the human body during intravenous injection due to the influence of the environment, resulting in the patient's inability to adapt during the injection and increased pain for the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a side view stereoscopic structural schematic diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the flow control mechanism structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the control shaft connection structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 6 It is a schematic diagram of the structure of the auxiliary fixing mechanism of the present invention;

[0028] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at B in the middle;

[0029] Figure 8 It is a schematic diagram of the cross-section connection structure of the extension patch of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the auxiliary heating mechanism of the present invention;

[0031] Fig.10 It is a schematic diagram of the cross-sectional connection structure of the connection cover of the present invention.

[0032] [Reference Signs]

[0033] 1. Intravenous cannula body; 2. Connecting tube;

[0034] 3. Flow control mechanism; 301. Sleeve; 302. Connecting shaft; 303. Control shaft; 304. Stop block; 305. Pull rope; 306. Return spring; 307. Shaft cover; 308. Adjusting rod; 309. Gear ring; 3010. Tension spring;

[0035] 4. Ventilation holes;

[0036] 5. Auxiliary heating mechanism; 501. Ring; 502. Connecting strip; 503. Connecting cover; 504. Heating rod;

[0037] 6. Operation table; 7. Extension sticker; 8. Adhesive layer; 9. Protective film; 10. Placement slot; 11. Fixing block; 12. Limiting slot;

[0038] 13. Auxiliary fixing mechanism; 1301. Control rod; 1302. Binding strap; 1303. Torque spring; 1304. Pull rod;

[0039] 14. Connecting slot; 15. Movable slot; 16. Moving block.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0042] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0043] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0044] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0045] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0046] like Figures 1 to 10As shown, an embodiment of the present invention provides a cardiac surgical venous cannula, including a venous cannula body 1, a connecting tube 2 is sleeved on the outside of the venous cannula body 1, and a flow control mechanism 3 is fixedly connected to the middle position of the connecting tube 2, and an auxiliary heating mechanism 5 is sleeved on the outside of the flow control mechanism 3, and both ends of the auxiliary heating mechanism 5 are tightly attached to the surface of the connecting tube 2, an operating table 6 is fixedly connected to the outside of the connecting tube 2, and a plurality of air holes 4 are provided on the surface of the operating table 6, an extension patch 7 is fixedly connected to the bottom end of the operating table 6, and an adhesive layer 8 is fixedly connected to the bottom end of the extension patch 7, and a protective film 9 is pasted to the bottom end of the adhesive layer 8, a placement groove 10 is fixedly connected to one side of the operating table 6, and a group of left-right symmetrical fixing blocks 11 are fixedly connected to the side of the operating table 6 away from the placement groove 10, and a limiting groove 12 is provided at the top of the fixing block 11, and an auxiliary fixing mechanism 13 is movably connected inside the limiting groove 12.

[0047] Pass one end of the intravenous cannula body 1 through the connecting tube 2 and the sleeve 301 in sequence, then tear off the protective film 9, stick the extension stickers 7 on both sides to the injection position, hold the pull rod 1304 and pull out the strap 1302 to one side, and then wrap the strap 1302 around the fixed position for one week. When the strap 1302 is pulled, the control rod 1301 pulls one end along the strap 1302 to rotate. At this time, the torque spring 1303 shrinks and tightens the axis. At this time, press the pull rod 1304 slot downward against the limit slot 12 so that the pull rod 1304 is clamped at the top of the fixed block 11. When disassembly is required, pull the pull rod 1304 from the fixed block 11 The top end is pulled out and the bandage 1302 is slowly loosened. At this time, the torque spring 1303 reacts on the control rod 1301 to make it rotate in the opposite direction and rotate the winding bandage 1302 at the same time, which is beneficial to strengthen the stability of the device fixation and prevent the single fixation method from causing the device to fall off when the patient turns over or other movements, so that the needle injection needs to be performed again, which increases the patient's psychology. It is judged whether the injection liquid needs to be heated according to the environment during use. When necessary, the ring 501 is aligned with the outside of the sleeve 301, and the magnets are aligned at the same time. The magnetic poles are attracted to each other so that the connecting cover 503 is adsorbed on the outside of the connecting tube 2, and the external electric The source, the heating rod 504 generates heat, which is beneficial to heating the liquid flowing through the intravenous cannula body 1 inside the connecting tube 2, and avoiding the large stability gap between the medicine and the human body during intravenous injection due to the influence of the environment, resulting in the patient's inability to adapt during the injection and increasing the patient's pain. When the injection rate needs to be adjusted, the shaft cover 307 drives the connecting shaft 302 to rotate. At this time, the limit bar moves and engages through the sawtooth, and the tension spring 3010 is stretched obliquely. At the same time, the two outer sides of the adjusting rod 308 push the intravenous cannula body 1 to rotate in an S shape. At the same time, the greater the rotation amplitude of the adjusting rod 308, the greater the torque of the intravenous cannula body 1. The smaller the flow rate, when the control shaft 303 is pressed downward, the moving block 16 slides downward inside the movable groove 15, and at the same time, the bottom end of the control shaft 303 pulls the pull rope 305 downward, so that the other end pulls the limit block 304 to move the inside of the connecting groove 14. At this time, the limit block 304 is released from the limit on the gear ring 309, and at the same time, the tension spring 3010 reacts to the control shaft 303 to reset. At this time, the adjustment rod 308 rotates to release the flow rate limit on the intravenous cannula body 1, which is beneficial to adjust the injection rate and avoid inaccurate adjustment of the injection rate by pushing speed during injection, which may cause further injury to the patient and is convenient for operation.

[0048] like Figure 1-Figure 5As shown, the flow control mechanism 3 includes a sleeve 301, a connecting shaft 302, a control shaft 303, a limit block 304, a pull rope 305 and a reset spring 306. The bottom end of the connecting shaft 302 extends to the inside of the sleeve 301. A connecting groove 14 is provided inside the connecting shaft 302, and the connecting groove 14 horizontally penetrates the connecting shaft 302. A group of left-right symmetrical movable grooves 15 are provided inside the connecting shaft 302, and the movable grooves 15 are located on both sides of the middle position of the connecting groove 14. The control shaft 303 vertically penetrates the connecting shaft 302 and extends to the inside of the connecting groove 14. The limit block 304 is adapted to the connecting groove 14 and is slidably connected to the two ends of the connecting groove 14 respectively. One end of the pull rope 305 is fixedly connected to the opposite side of the limit block 304, and the other end of the pull rope 305 is fixedly connected to the outside of the control shaft 303. The reset spring 306 is sleeved on the outside of the pull rope 305. The bottom end of the control shaft 303 is fixedly connected to the moving block 16, and the moving block 16 extends to the inside of the movable groove 15, the top end of the connecting shaft 302 is fixedly connected to the shaft cover 307, and the connecting shaft 302 passes through the shaft cover 307 and extends its top end, the bottom end of the connecting shaft 302 is fixedly connected to two obliquely symmetrical adjusting rods 308, the sleeve 301 is fixedly connected to the middle position of the operating table 6, the opposite sides of the connecting pipe 2 are connected to the inside of the sleeve 301, the venous cannula body 1 is located on the opposite side of the adjusting rod 308, the inside of the sleeve 301 is fixedly connected to a toothed ring 309, the outer side of the limit block 304 is provided with serrations, and the limit block 304 is clamped with the toothed ring 309 through the serrations, the outer side of the connecting shaft 302 is fixedly connected to two obliquely symmetrical tension springs 3010, and the other end of the tension spring 3010 is fixedly connected to the inner wall of the sleeve 301.

[0049] The connecting shaft 302 is driven to rotate by the shaft cover 307. At this time, the limit bar is engaged by the sawtooth movement, and the tension spring 3010 is stretched obliquely. At the same time, the two outer sides of the adjusting rod 308 push the intravenous cannula body 1 to rotate in an S shape. At the same time, the greater the rotation amplitude of the adjusting rod 308, the greater the torque of the intravenous cannula body 1 and the smaller the flow rate. At the same time, when the control shaft 303 is pressed downward, the moving block 16 slides downward inside the movable groove 15. At the same time, the bottom end of the control shaft 303 pulls the pull rope 305 downward, so that the other end of it pulls the limit block 304 to move the inside of the connecting groove 14. At this time, the limit block 304 is released from the limit on the tooth ring 309, and at the same time, the tension spring 3010 reacts to reset the control shaft 303. At this time, the adjusting rod 308 rotates to release the flow rate speed limit of the intravenous cannula body 1, which is conducive to adjusting the injection rate and avoiding inaccurate adjustment of the injection rate by pushing speed during injection, which may cause further injury to the patient and is convenient for operation.

[0050] like Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8As shown, the auxiliary fixing mechanism 13 includes a control rod 1301, a strap 1302, a torque spring 1303 and a pull rod 1304. The strap 1302 is wound around the outside of the control rod 1301, and the pull rod 1304 is fixedly connected to the other end of the strap 1302. The torque spring 1303 is fixedly connected to both ends of the pull rod 1304. Both ends of the pull rod 1304 are respectively provided with a slot. Both ends of the control rod 1301 are movably connected to the placement slot 10 through a bearing. Inside, one end of the torque spring 1303 away from the control rod 1301 is fixedly connected to the inner wall of the placement slot 10, one end of the strap 1302 passes through the placement slot 10 and the extension patch 7 in sequence and extends to the outside thereof, the pull rod 1304 is located on the outside of the extension patch 7, the card slot is adapted to the limit slot 12, the pull rod 1304 is clamped with the fixed block 11 through the limit slot 12, and the strap 1302 forms a release and recovery structure of the pull rope 305 through the control rod 1301 and the torque spring 1303.

[0051] By holding the pull rod 1304 and pulling the strap 1302 to one side, and then wrapping the strap 1302 around the fixed position for one circle, when the strap 1302 is pulled, the control rod 1301 pulls one end along the strap 1302 to rotate. At this time, the torque spring 1303 contracts and tightens the axis. At this time, the pull rod 1304 is pressed downward on the limit slot 12 to make the pull rod 1304 clamped on the top of the fixed block 11. When disassembly is required, the pull rod 1304 is pulled out from the top of the fixed block 11, and the strap 1302 is slowly loosened. At this time, the torque spring 1303 reacts on the control rod 1301, causing it to rotate in the opposite direction and rotate the reeled strap 1302 at the same time, which is beneficial to enhance the stability of the device fixation and prevent the single fixation method from causing the device to fall off when the patient turns over or other movements, thereby requiring needle injection again, which increases the patient's psychological.

[0052] like Figure 1 , Figure 2 , Fig. 9 and Fig.10 As shown, the auxiliary heating mechanism 5 includes a collar 501, a connecting strip 502, a connecting cover 503 and a heating rod 504. The connecting strip 502 is provided with two and fixedly connected to the bottom end of the collar 501. The connecting covers 503 are respectively fixedly connected to the bottom ends of the connecting strip 502. The heating rod 504 is provided with several and fixedly connected to the inside of the connecting cover 503. The connecting cover 503 is arc-shaped, and the connecting cover 503 is adapted to the outside of the connecting pipe 2. The collar 501 is sleeved on the outside of the sleeve 301, and the connecting strip 502 is located on both sides of the sleeve 301. The outside of the connecting pipe 2 is fixedly connected with a magnet, and the inside of the connecting cover 503 is fixedly connected with a magnet, and the magnetic poles of the magnets located on the connecting pipe 2 and the inside of the connecting cover 503 are oppositely arranged.

[0053] By aligning the ring 501 with the outside of the sleeve 301 and the magnets at the same time, the magnetic poles are attracted to each other so that the connecting cover 503 is adsorbed on the outside of the connecting tube 2. At the same time, the external power supply and the heating rod 504 generate heat, which is beneficial to heating the liquid flowing through the intravenous cannula body 1 inside the connecting tube 2, thereby avoiding the large stability gap between the medicine and the human body during intravenous injection due to the influence of the environment, resulting in the patient's inability to adapt during the injection and increased pain for the patient.

[0054] The working process of the technical solution provided by the present invention is as follows:

[0055] When the present invention is used, first, one end of the intravenous cannula body 1 is passed through the connecting tube 2 and the sleeve 301 in sequence, and then the protective film 9 is torn off, and the extension stickers 7 on both sides are pasted to the injection position, and then the pull rod 1304 is held to pull out the bandage 1302 to one side, and then the bandage 1302 is wrapped around the fixed position for one circle. When the bandage 1302 is pulled, the control rod 1301 pulls one end along the bandage 1302 to rotate, and at this time, the torque spring 1303 shrinks and tightens the axis, and at this time, the pull rod 1304 is aligned with the slot The limiting groove 12 is pressed downward to make the pull rod 1304 clamped on the top of the fixing block 11. When disassembly is required, the pull rod 1304 is pulled out from the top of the fixing block 11, and the band 1302 is slowly loosened. At this time, the torque spring 1303 reacts on the control rod 1301 to make it rotate in the opposite direction and tighten the band 1302 at the same time. It is determined whether the injection liquid needs to be heated according to the specific environment during use. When necessary, the ring 501 is aligned with the outside of the sleeve 301, and the magnet is aligned at the same time. The poles attract each other so that the connecting cover 503 is adsorbed on the outside of the connecting tube 2. At the same time, the external power supply and the heating rod 504 generate heat, which makes the patient unable to adapt during the injection and increases the pain of the patient. When the injection rate needs to be adjusted, the shaft cover 307 drives the connecting shaft 302 to rotate. At this time, the limit bar is engaged by the sawtooth movement, and the tension spring 3010 is stretched obliquely. At the same time, the two outer sides of the adjusting rod 308 push the intravenous cannula body 1 to rotate in an S shape. At the same time, the greater the rotation amplitude of the adjusting rod 308, the greater the torque of the intravenous cannula body 1 and the smaller the flow rate. At the same time, when the control shaft 303 is pressed downward, the moving block 16 slides downward inside the movable groove 15, and at the same time, the bottom end of the control shaft 303 pulls the pull rope 305 downward, so that the other end of it pulls the limit block 304 to move the inside of the connecting groove 14. At this time, the limit block 304 is released from the limit at the tooth ring 309, and at the same time, the tension spring 3010 reacts to the control shaft 303 to reset. At this time, the adjusting rod 308 rotates to release the flow rate limit of the intravenous cannula body 1.

[0056] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cardiac surgery venous cannula, comprising a venous cannula body, characterized in that: A connecting tube is sleeved on the outside of the intravenous cannula body, and a flow control mechanism is fixedly connected to the middle position of the connecting tube, and an auxiliary heating mechanism is sleeved on the outside of the flow control mechanism, and both ends of the auxiliary heating mechanism are tightly attached to the surface of the connecting tube, an operating table is fixedly connected to the outside of the connecting tube, and a plurality of air holes are provided on the surface of the operating table, an extension patch is fixedly connected to the bottom end of the operating table, and an adhesive layer is fixedly connected to the bottom end of the extension patch, and a protective film is pasted on the bottom end of the adhesive layer, a placement groove is fixedly connected to one side of the operating table, and a group of left-right symmetrical fixing blocks are fixedly connected to the side of the operating table away from the placement groove, and a limiting groove is provided at the top of the fixed block, and an auxiliary fixing mechanism is movably connected inside the limiting groove.

2. The cardiac surgical venous cannula according to claim 1, characterized in that: The flow control mechanism includes a sleeve, a connecting shaft, a control shaft, a limit block, a pull rope and a reset spring. The bottom end of the connecting shaft extends to the interior of the sleeve. A connecting groove is provided inside the connecting shaft, and the connecting groove passes through the connecting shaft horizontally. A group of left-right symmetrical movable grooves are provided inside the connecting shaft, and the movable grooves are located on both sides of the middle position of the connecting groove. The control shaft vertically passes through the connecting shaft and extends to the inside of the connecting groove. The limit block is adapted to the connecting groove and is slidably connected to the two ends of the connecting groove respectively. One end of the pull rope is fixedly connected to the opposite side of the limit block, and the other end of the pull rope is fixedly connected to the outside of the control shaft. The reset spring is sleeved on the outside of the pull rope. The bottom end of the control shaft is fixedly connected to the moving block, and the moving block extends to the inside of the movable groove.

3. The cardiac surgical venous cannula according to claim 2, characterized in that: The top end of the connecting shaft is fixedly connected with a shaft cover, and the connecting shaft passes through the shaft cover and extends to its top end. The bottom end of the connecting shaft is fixedly connected with two obliquely symmetrical adjustment rods. The sleeve is fixedly connected to the middle position of the operating table. The opposite sides of the connecting pipe are connected to the inside of the sleeve. The venous cannula body is located on the opposite side of the adjustment rod.

4. The cardiac surgical venous cannula according to claim 2, characterized in that: The inside of the sleeve is fixedly connected with a gear ring, the outer side of the limit block is provided with serrations, and the limit block is clamped with the gear ring through the serrations, the outer side of the connecting shaft is fixedly connected with two obliquely symmetrical tension springs, and the other end of the tension spring is fixedly connected to the inner wall of the sleeve.

5. The cardiac surgical venous cannula according to claim 1, characterized in that: The auxiliary fixing mechanism includes a control rod, a strap, a torque spring and a pull rod. The strap is wrapped around the outside of the control rod, and the pull rod is fixedly connected to the other end of the strap. The torque spring is respectively fixedly connected to both ends of the pull rod, and both ends of the pull rod are respectively provided with a slot.

6. The cardiac surgical venous cannula according to claim 5, characterized in that: The two ends of the control rod are movably connected to the inside of the placement slot through bearings, and the end of the torque spring away from the control rod is fixedly connected to the inner wall of the placement slot. One end of the strap passes through the placement slot and the extension patch in turn and extends to the outside thereof. The pull rod is located on the outside of the extension patch.

7. The cardiac surgical venous cannula according to claim 5, characterized in that: The clamping slot is matched with the limiting slot, the pull rod is clamped with the fixing block through the limiting slot, and the binding belt forms a pull rope releasing and recovering structure through the control rod and the torque spring.

8. The cardiac surgical venous cannula according to claim 1, characterized in that: The auxiliary heating mechanism includes a sleeve, a connecting strip, a connecting cover and a heating rod. The connecting strips are provided with two and fixedly connected to the bottom end of the sleeve. The connecting covers are respectively fixedly connected to the bottom ends of the connecting strips. The heating rods are provided with several and fixedly connected to the inside of the connecting cover.

9. The cardiac surgical venous cannula according to claim 8, characterized in that: The connecting cover is arc-shaped and matched with the outer side of the connecting pipe. The collar is sleeved on the outer side of the sleeve, and the connecting strips are located on both sides of the sleeve.

10. The cardiac surgical venous cannula according to claim 8, characterized in that: The outer side of the connecting pipe is fixedly connected with a magnet, the inner side of the connecting cover is fixedly connected with a magnet, and the magnetic poles of the magnets located on the connecting pipe and the inner side of the connecting cover are arranged oppositely.

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