A cardiac surgical venous cannula

Abstract

The present invention provides a venous cannula for cardiac surgery, which relates to the technical field of medical devices. It includes a venous cannula body, a connecting tube is sleeved outside 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 outside the flow control mechanism, and both ends of the auxiliary heating mechanism are closely attached to the surface of the connecting tube. By setting the flow control mechanism in the present invention, the connecting shaft is driven to rotate by the shaft cover. At this time, the limit strip moves and meshes through the saw teeth, and the tension spring is obliquely stretched. At the same time, both sides of the adjusting rod push the venous 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 venous cannula body and the smaller the flow rate, which is beneficial to adjusting the injection rate, avoiding inaccurate adjustment of the injection rate by pushing fast or slow during injection, which may cause secondary harm to the patient, and is convenient for operation.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a venous cannula for cardiac surgery. 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 the surgical risk to the lowest limit and consider the aesthetics of the postoperative wound. Like other fields, cardiac surgery has also become an inevitable trend to develop in the direction of minimally invasive surgery. The superior vena cava cannula can assist minimally invasive cardiac use.

[0003] For example, the publication number is: CN208823722U, and the name is: A venous cannula for cardiac surgery. By installing a first protective sleeve at one end of the outer sleeve and a second protective sleeve at the other end of the outer sleeve, the inner catheter can be protected through the first protective sleeve and the second protective sleeve. By setting an activity groove outside the balloon and a bolt with a fixed sleeve on one side of the balloon, the balloon can be compressed by the bolt, so as to inflate the inflation chamber. The device has the characteristics of diverse functions and more convenient use.

[0004] During actual use, for manual intravenous injection of patients, medical staff need to manually control the flow rate. Due to manual control, there will still be certain differences in the flow rate. Secondly, before injection, the intravenous injection tube needs to be fixed to the patient's body position. The existing method is directly through pasting. Long-term pasting will cause the viscosity to fail or a single fixing method, and following the patient's turning will cause the needle to fall off. 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] Aiming at the problems existing in the prior art that during manual intravenous injection of patients, medical staff need to manually control the flow rate. Due to manual control, there will still be certain differences in the flow rate. Secondly, before injection, the intravenous injection tube needs to be fixed to the patient's body position. The existing method is directly through pasting. Long-term pasting will cause the viscosity to fail or a single fixing method, and following the patient's turning will cause the needle to fall off. Moreover, 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 venous cannula for cardiac surgery.

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

[0007] A cardiac surgical venous cannula, comprising a venous cannula body, a connecting tube is sleeved outside 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 outside the flow control mechanism, and both ends of the auxiliary heating mechanism are closely attached to the surface of the connecting tube. The outside of the connecting tube is fixedly connected with an operating table, and several ventilation holes are opened on the surface of the operating table. The bottom end of the operating table is fixedly connected with an extension sticker, and the bottom end of the extension sticker is fixedly connected with an adhesive layer. A protective film is pasted on the bottom end of the adhesive layer. One side of the operating table is fixedly connected with a placement groove, and a group of symmetrically arranged fixing blocks are fixedly connected to the side of the operating table away from the placement groove, and a limiting groove is opened at the top end of the fixing block. An auxiliary fixing mechanism is movably connected inside the placement groove.

[0008] Optionally, the flow control mechanism includes a sleeve, a connecting shaft, a control shaft, a limiting block, a pull rope and a return spring. The bottom end of the connecting shaft extends into the sleeve. A connecting groove is opened inside the connecting shaft, and the connecting groove horizontally penetrates the connecting shaft. A group of symmetrically arranged movable grooves are opened 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 penetrates the connecting shaft and extends into the connecting groove. The limiting block is adapted to the connecting groove and is respectively slidably connected to both ends of the connecting groove. One end of the pull rope is fixedly connected to the opposite side of the limiting block, and the other end of the pull rope is fixedly connected to the outside of the control shaft. The return spring is sleeved outside the pull rope. The bottom end of the control shaft is fixedly connected with a moving block, and the moving block extends into the movable groove.

[0009] Optionally, the top end of the connecting shaft is fixedly connected with a shaft cover, and the control shaft penetrates the shaft cover and extends to its top end. The bottom end of the connecting shaft is fixedly connected with two obliquely symmetric adjusting rods. The sleeve is fixedly connected to the middle position of the operating table. The opposite sides of the connecting tube are both communicated with the inside of the sleeve. The venous cannula body is located on the opposite side of the adjusting rods.

[0010] Optionally, a toothed ring is fixedly connected inside the sleeve. Sawteeth are opened on the outside of the limiting block, and the limiting block is clamped with the toothed ring through the sawteeth. Two obliquely symmetric tension springs are fixedly connected to the outside of the connecting shaft, and the other ends of the tension springs are fixedly connected to the inner wall of the sleeve.

[0011] Optionally, the auxiliary fixing mechanism includes a control rod, a strap, a torsion spring and a pull rod. The strap is wound around the outside of the control rod, and the pull rod is fixedly connected to the other end of the strap. Torsion springs are respectively fixedly connected to both ends of the control rod. Card slots are opened at both ends of the pull rod.

[0012] Optionally, both ends of the control rod are movably connected to the inside of the placement groove through bearings, and one end of the torsion spring away from the control rod is fixedly connected to the inner wall of the placement groove. One end of the strap passes through the placement groove and the extension sticker in sequence and extends outside thereof, and the pull rod is located outside the extension sticker.

[0013] Optionally, the card slot is adapted to the limit slot, the pull rod is clamped with the fixed block through the limit slot, and the strap and the torsion spring form a release and recovery structure through the control rod.

[0014] Optionally, the auxiliary heating mechanism includes a collar, connecting strips, a connecting cover and heating rods. There are two connecting strips and they are fixedly connected to the bottom end of the collar. The connecting covers are respectively fixedly connected to the bottom ends of the connecting strips. There are several heating rods and they are fixedly connected to the inside of the connecting cover.

[0015] Optionally, the connecting cover is arc-shaped and is adapted to 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 outer side of the connecting pipe, and a magnet is fixedly connected to the inside of the connecting cover, and the magnetic poles of the magnet located on the connecting pipe and the inner side of the connecting cover are arranged in opposite directions.

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

[0018] In the above solution, through the provided flow control mechanism, the connecting shaft is driven to rotate by the shaft cover. At this time, the limit strip moves and meshes through the saw teeth, the tension spring is obliquely stretched, and at the same time, both sides of the adjusting rod push the venous 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 venous cannula body and the smaller the flow rate. At the same time, when the control shaft is pressed downwards, the moving block slides downwards inside the movable groove, and at the same time, the bottom end of the control shaft pulls down the pull rope, and the other end of the pull rope pulls the limit block into the connecting groove. At this time, the limit block releases the limit on the toothed ring, and at the same time, the tension spring reacts on the control shaft to reset. At this time, the rotation of the adjusting rod releases the flow rate limit on the venous cannula body, which is beneficial to adjusting the injection rate, avoiding inaccurate adjustment of the injection rate by pushing fast or slow during injection, which may cause secondary harm to the patient, and is convenient to operate.

[0019] Through the provided auxiliary fixing mechanism, hold the pull rod and pull out the strap to one side, then wind the strap around the fixing position for one week. When the strap is pulled, the control rod rotates along with the pulled end of the strap. At this time, the torsion spring contracts and tightens the shaft. Then press the pull rod slot downward against the limit slot so that the pull rod is clamped at the top of the fixed block. When disassembling, pull out the pull rod from the top of the fixed block and slowly loosen the strap. At this time, the torsion spring reacts on the control rod, causing it to rotate in the reverse direction and wind up the strap at the same time, which helps to enhance the fixing stability of the device, prevent the device from falling off due to a single fixing method when the patient turns over or makes other movements, thus avoiding the need for repeated needle injections and reducing the patient's psychological burden.

[0020] Through the provided auxiliary heating mechanism, align the collar with the outside of the sleeve and align the magnets at the same time. Due to the mutual attraction of the magnetic poles, the connecting cover is adsorbed on the outside of the connecting pipe. At the same time, connect to an external power supply and the heating rod generates heat, which helps to heat the liquid flowing through the venous cannula body inside the connecting pipe, avoiding a large temperature difference between the medicine and the human body when performing intravenous injection due to environmental influence, which may cause discomfort to the patient during injection and increase the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

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

[0023] Figure 2 is a side three-dimensional structural schematic diagram of the present invention;

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

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

[0026] Figure 5 is of the present invention Figure 4 is an enlarged structural schematic diagram at A in;

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

[0028] Figure 7 is of the present invention Figure 6 is an enlarged structural schematic diagram at B in;

[0029] Figure 8 is a cross-sectional connection structural schematic diagram of the extension patch of the present invention;

[0030] Figure 9 Schematic structural diagram of the auxiliary heating mechanism of the present invention;

[0031] Figure 10 Schematic sectional connection structure diagram of the connection cover of the present invention.

[0032] [Reference numerals]

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

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

[0035] 4. Ventilation holes;

[0036] 5. Auxiliary heating mechanism; 501. Collar; 502. Connecting bar; 503. Connection cover; 504. Heating rod;

[0037] 6. Operating table; 7. Extension patch; 8. Adhesive layer; 9. Protective film; 10. Placing groove; 11. Fixed block; 12. Limit groove;

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

[0039] 14. Connection groove; 15. Movable groove; 16. Moving block.

[0040] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments. Detailed implementation manners

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, 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 in the specification, references to "one embodiment", "an embodiment", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Additionally, when a particular feature, structure, or characteristic is described in connection with an embodiment, implementing such feature, structure, or characteristic in connection with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0043] Generally, terms can be understood, at least in part, from their 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 a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, depending at least in part on the context, can alternatively allow for the existence of other factors that may not be explicitly described.

[0044] It can be understood that the meanings of "on", "above", and "over" in the present invention should be construed in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0045] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the figures. Spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented, and the spatial relative descriptors used herein can be similarly interpreted accordingly.

[0046] Such as Figures 1 to 10As shown in the figure, an embodiment of the present invention provides a venous cannula for cardiac surgery, including a venous cannula body 1. A connecting tube 2 is sleeved outside the venous cannula body 1. A flow control mechanism 3 is fixedly connected to the middle position of the connecting tube 2. An auxiliary heating mechanism 5 is sleeved outside the flow control mechanism 3. Both ends of the auxiliary heating mechanism 5 are closely attached to the surface of the connecting tube 2. An operating table 6 is fixedly connected to the outside of the connecting tube 2. Several ventilation holes 4 are formed on the surface of the operating table 6. An extension patch 7 is fixedly connected to the bottom end of the operating table 6. An adhesive layer 8 is fixedly connected to the bottom end of the extension patch 7. A protective film 9 is pasted on the bottom end of the adhesive layer 8. A placement groove 10 is fixedly connected to one side of the operating table 6. A group of symmetrically arranged fixing blocks 11 are fixedly connected to the side of the operating table 6 away from the placement groove 10. A limiting groove 12 is formed at the top end of the fixing block 11. An auxiliary fixing mechanism 13 is movably connected to the inside of the placement groove 10.

[0047] Insert one end of the venous cannula body 1 through the connecting tube 2 and the sleeve 301 in sequence, then tear off the protective film 9, paste the two-sided extension patch 7 at the injection position, hold the pull rod 1304 and pull the strap 1302 to one side, then wind the strap 1302 around the fixed position for one week. When the strap 1302 is pulled, the control rod 1301 rotates along one end of the strap 1302. At this time, the torque spring 1303 contracts and tightens the shaft. Then press the card slot of the pull rod 1304 against the limit slot 12 downward so that the pull rod 1304 is clamped at the top of the fixed block 11. When disassembly is required, pull out the pull rod 1304 from the top of the fixed block 11 and slowly release the strap 1302. At this time, the torque spring 1303 reacts on the control rod 1301, causing it to rotate in the reverse direction and wind up the strap 1302 at the same time, which is beneficial to enhancing the fixing stability of the device and preventing the device from falling off due to a single fixing method when the patient turns over or makes other movements, thus requiring needle injection again and increasing the patient's psychology. Judge whether it is necessary to heat the injection liquid according to the environment during use. If necessary, align the collar 501 with the outside of the sleeve 301, and at the same time align the magnets. Due to the mutual attraction of the magnetic poles, the connecting cover 503 is adsorbed on the outside of the connecting tube 2. At the same time, connect the external power supply, and the heating rod 504 generates heat, which is beneficial to heating the liquid flowing through the venous cannula body 1 inside the connecting tube 2, avoiding too large a temperature difference between the medicine and the human body when performing intravenous injection under the influence of the environment, resulting in the patient's inability to adapt during the injection and increasing the patient's pain. When it is necessary to adjust the injection rate, the shaft cover 307 drives the connecting shaft 302 to rotate. At this time, the limit strip moves and meshes through the serrations, and the tension spring 3010 is obliquely stretched. At the same time, the two outer sides of the adjusting rod 308 push the venous 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 and the smaller the flow rate of the venous cannula body 1. At the same time, when pressing down the control shaft 303, 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, causing the other end to pull the limit block 304 to displace inside the connecting groove 14. At this time, the limit block 304 is disengaged from the tooth ring 309, and at the same time the tension spring 3010 reacts on the control shaft 303 to reset. At this time, the rotation of the adjusting rod 308 releases the flow rate limit of the venous cannula body 1, which is beneficial to adjusting the injection rate, avoiding inaccuracies in adjusting the injection rate by pushing fast or slow during injection, which may cause secondary harm to the patient, and is also convenient for operation.

[0048] Such as Figures 1 - 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 return spring 306. The bottom end of the connecting shaft 302 extends into the interior of the sleeve 301. A connecting groove 14 is formed inside the connecting shaft 302, and the connecting groove 14 horizontally penetrates the connecting shaft 302. A set of left-right symmetric movable grooves 15 are formed 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 into the connecting groove 14. The limit block 304 is adapted to the connecting groove 14 and is respectively slidably connected to both ends of the connecting groove 14. 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 return spring 306 is sleeved on the outside of the pull rope 305. The bottom end of the control shaft 303 is fixedly connected to a moving block 16, and the moving block 16 extends into the interior of the movable groove 15. The top end of the connecting shaft 302 is fixedly connected with a shaft cover 307, and the control shaft 303 penetrates the shaft cover 307 and extends to its top end. The bottom end of the connecting shaft 302 is fixedly connected with two obliquely symmetric 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 both communicated with the interior of the sleeve 301. The venous cannula body 1 is located on the opposite sides of the adjusting rods 308. A toothed ring 309 is fixedly connected to the interior of the sleeve 301. Sawteeth are formed on the outside of the limit block 304, and the limit block 304 is clamped with the toothed ring 309 through the sawteeth. Two obliquely symmetric tension springs 3010 are fixedly connected to the outside of the connecting shaft 302, and the other ends of the tension springs 3010 are fixedly connected to the inner wall of the sleeve 301.

[0049] By driving the connecting shaft 302 to rotate through the shaft cover 307, at this time, the limit strip moves and meshes through the sawteeth, the tension spring 3010 is obliquely stretched, and at the same time, the two outer sides of the adjusting rod 308 push the venous 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 venous cannula body 1 and the smaller the flow rate. At the same time, when pressing down the control shaft 303, the moving block 16 slides downward inside the movable groove 15. At the same time, the bottom end of the control shaft 303 pulls down the pull rope 305, and the other end of it pulls the limit block 304 to displace inside the connecting groove 14. At this time, the limit block 304 is disengaged from the limit of the toothed ring 309, and at the same time, the tension spring 3010 reacts on the control shaft 303 to reset. At this time, the rotation of the adjusting rod 308 releases the flow rate limit of the venous cannula body 1, which is beneficial to adjusting the injection rate, avoiding inaccurate adjustment of the injection rate by pushing fast or slow during injection, which may cause secondary harm to the patient, and at the same time facilitating the operation.

[0050] As Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 and Figure 8As shown in the figure, the auxiliary fixing mechanism 13 includes a control rod 1301, a strap 1302, a torsion 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 torsion springs 1303 are respectively fixedly connected to both ends of the control rod 1301. Slots are respectively formed at both ends of the pull rod 1304. Both ends of the control rod 1301 are movably connected to the inside of the placement groove 10 through bearings, and the end of the torsion spring 1303 away from the control rod 1301 is fixedly connected to the inner wall of the placement groove 10. One end of the strap 1302 passes through the placement groove 10 and the extension patch 7 in sequence and extends to its outside. The pull rod 1304 is located outside the extension patch 7. The slots are adapted to the limit slots 12, and the pull rod 1304 is clamped with the fixed block 11 through the limit slots 12. The strap 1302 and the torsion spring 1303 form a structure for loosening, releasing, recycling the pull rope 305 through the control rod 1301.

[0051] By holding the pull rod 1304 and pulling out the strap 1302 to one side, then winding the strap 1302 around the fixed position for one week. When the strap 1302 is pulled, the control rod 1301 rotates along one end pulled by the strap 1302. At this time, the torsion spring 1303 contracts and tightens. At this time, press the slot of the pull rod 1304 against the limit slot 12 downward so that the pull rod 1304 is clamped at the top of the fixed block 11. When disassembly is required, pull out the pull rod 1304 from the top of the fixed block 11 and slowly release the strap 1302. At this time, the torsion spring 1303 reacts against the control rod 1301, causing it to rotate in the reverse direction and simultaneously winding up the strap 1302, which is beneficial to enhancing the fixing stability of the device, preventing the device from falling off due to a single fixing method during the patient's turning over or other movements, thus requiring needle injection again, and increasing the patient's psychology.

[0052] As Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown in the figure, the auxiliary heating mechanism 5 includes a collar 501, connecting strips 502, a connecting cover 503, and heating rods 504. There are two connecting strips 502 and they are 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 strips 502. There are several heating rods 504 and they are fixedly connected to the inside of the connecting cover 503. The connecting cover 503 is arc-shaped and 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 strips 502 are located on both sides of the sleeve 301. Magnets are fixedly connected to the outside of the connecting pipe 2, and magnets are fixedly connected to the inside of the connecting cover 503, and the magnetic poles of the magnets located inside the connecting pipe 2 and the connecting cover 503 are arranged in opposite directions.

[0053] Align the outside of the sleeve 301 through the collar 501. At the same time, align the magnets. Attracted by the magnetic poles, the connecting cover 503 is adsorbed on the outside of the connecting tube 2. At the same time, connect to an external power supply, and the heating rod 504 generates heat, which is beneficial to heating the liquid flowing through the venous intubation body 1 inside the connecting tube 2, avoiding a too large temperature difference between the medicine and the human body when performing intravenous injection under the influence of the environment, resulting in the patient's inability to adapt during the injection and increasing the patient's pain.

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

[0055] When the present invention is in use, first, pass one end of the venous intubation body 1 through the connecting tube 2 and the sleeve 301 in sequence, then tear off the protective film 9, paste the two-sided extension stickers 7 on the injection position, then hold the pull rod 1304 and pull the strap 1302 to one side, and then wind the strap 1302 around the fixed position for one week. When the strap 1302 is pulled, the control rod 1301 rotates along one end of the strap 1302. At this time, the torsion spring 1303 contracts and tightens the shaft. At this time, press the card slot of the pull rod 1304 against the limit slot 12 so that the pull rod 1304 is clamped at the top of the fixed block 11. When disassembling, pull out the pull rod 1304 from the top of the fixed block 11 and slowly loosen the strap 1302. At this time, the torsion spring 1303 reacts on the control rod 1301, causing it to rotate in the reverse direction and at the same time rotate and tighten the strap 1302. Judge whether it is necessary to heat the injection liquid according to the specific environment during use. If necessary, align the collar 501 with the outside of the sleeve 301. At the same time, align the magnets. Attracted by the magnetic poles, the connecting cover 503 is adsorbed on the outside of the connecting tube 2. At the same time, connect to an external power supply, and the heating rod 504 generates heat, resulting in the patient's inability to adapt during the injection and increasing the patient's pain. When it is necessary to adjust the injection rate, the shaft cover 307 drives the connecting shaft 302 to rotate. At this time, the limit strip moves and meshes through the saw teeth, and the tension spring 3010 is obliquely stretched. At the same time, the two outer sides of the adjusting rod 308 push the venous intubation 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 and the smaller the flow rate of the venous intubation body 1. At the same time, when pressing down the control shaft 303, the moving block 16 slides down inside the movable groove 15. At the same time, the bottom end of the control shaft 303 pulls down the pull rope 305, causing the other end to pull the limiting block 304 to displace inside the connecting groove 14. At this time, the limiting block 304 releases the limit on the toothed ring 309. At the same time, the tension spring 3010 reacts on the control shaft 303 to reset. At this time, the rotation of the adjusting rod 308 releases the flow rate limit on the venous intubation body 1.

[0056] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions made to the essence and scope of the present invention. For the public to have a thorough understanding of the present invention, specific details are elaborated in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. Additionally, well-known methods, processes, procedures, components, and circuits, etc., are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A cardiac surgical venous cannula, comprising a venous cannula body, characterized in that: A connecting pipe is sleeved outside the main body of the venous cannula. A flow control mechanism is fixedly connected to the middle position of the connecting pipe. An auxiliary heating mechanism is sleeved outside the flow control mechanism. Both ends of the auxiliary heating mechanism are closely attached to the surface of the connecting pipe. An operating platform is fixedly connected to the outside of the connecting pipe. Several ventilation holes are provided on the surface of the operating platform. An extension sticker is fixedly connected to the bottom end of the operating platform. A sticking layer is fixedly connected to the bottom end of the extension sticker. A protective film is stuck to the bottom end of the sticking layer. A placement groove is fixedly connected to one side of the operating platform. A set of symmetrically arranged fixing blocks are fixedly connected to the side of the operating platform away from the placement groove. A limiting groove is provided at the top end of the fixing block. An auxiliary fixing mechanism is movably connected to the inside of the placement groove; The flow control mechanism includes a sleeve, a connecting shaft, a control shaft, a limiting block, a pulling rope and a return spring. The bottom end of the connecting shaft extends into the inside of the sleeve. A connecting groove is provided inside the connecting shaft and horizontally penetrates the connecting shaft. A set of symmetrically arranged 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 penetrates the connecting shaft and extends into the connecting groove. The limiting block is adapted to the connecting groove and is respectively slidably connected to both ends of the connecting groove. One end of the pulling rope is fixedly connected to the opposite side of the limiting block, and the other end of the pulling rope is fixedly connected to the outside of the control shaft. The return spring is sleeved outside the pulling rope. A moving block is fixedly connected to the bottom end of the control shaft, and the moving block extends into the inside of the movable groove; A shaft cover is fixedly connected to the top end of the connecting shaft. The control shaft penetrates the shaft cover and extends to its top end. Two obliquely symmetric adjusting rods are fixedly connected to the bottom end of the connecting shaft. The sleeve is fixedly connected to the middle position of the operating platform. The opposite sides of the connecting pipe are both communicated with the inside of the sleeve. The main body of the venous cannula is located on the opposite side of the adjusting rod; A toothed ring is fixedly connected to the inside of the sleeve. Sawteeth are provided on the outside of the limiting block, and the limiting block is clamped with the toothed ring through the sawteeth. Two obliquely symmetric stretching springs are fixedly connected to the outside of the connecting shaft, and the other ends of the stretching springs are fixedly connected to the inner wall of the sleeve.

2. The cardiac surgical venous cannula according to claim 1, wherein The auxiliary fixing mechanism includes a control rod, a binding band, a torsion spring and a pull rod. The binding band is wound around the outside of the control rod. The pull rod is fixedly connected to the other end of the binding band. The torsion springs are respectively fixedly connected to both ends of the control rod. Card slots are provided at both ends of the pull rod.

3. The cardiac surgical venous cannula according to claim 2, wherein Both ends of the control rod are respectively movably connected to the inside of the placement groove through bearings. The end of the torsion spring away from the control rod is fixedly connected to the inner wall of the placement groove. One end of the binding band passes through the placement groove and the extension sticker in sequence and extends to its outside. The pull rod is located outside the extension sticker.

4. The cardiac surgical venous cannula according to claim 2, wherein, The card slot is adapted to the limiting groove. The pull rod is clamped with the fixing block through the limiting groove. The binding band forms a loosening and recycling structure with the control rod through the torsion spring.

5. The cardiac surgical venous cannula according to claim 1, characterized in that: The auxiliary heating mechanism includes a collar, connecting strips, a connecting cover and heating rods. There are two connecting strips and they are fixedly connected to the bottom end of the collar. The connecting covers are respectively fixedly connected to the bottom ends of the connecting strips. There are several heating rods and they are fixedly connected to the inside of the connecting cover.

6. The cardiac surgical venous cannula according to claim 5, characterized in that: The connecting cover is arc-shaped, and the connecting cover is adapted to 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.

7. The cardiac surgical venous cannula according to claim 5, characterized in that: Magnets are fixedly connected to the outer side of the connecting pipe, and magnets are fixedly connected to the inside of the connecting cover, and the magnetic poles of the magnets located inside the connecting pipe and the connecting cover are arranged in opposite directions.

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