A device for preventing backflow of blood during arterial puncture

Abstract

This invention relates to the field of arterial puncture needle technology, specifically to an anti-backflow arterial puncture device, comprising a housing, a catheter fixedly disposed within the housing along the puncture direction, an indwelling needle fixedly mounted on the front side of the housing, the catheter and the indwelling needle being connected, and a puncture needle inserted into the indwelling needle; the housing is provided with a flow-blocking mechanism for preventing backflow, the flow-blocking mechanism including a pneumatic cylinder fixedly disposed on the top of the housing, the pneumatic cylinder being divided into front and rear chambers, the front chamber of the pneumatic cylinder being connected to the catheter. This invention, by setting up a flow-blocking mechanism with a pneumatically driven choke ball cooperating with a spring, ensures that at the moment the puncture needle is withdrawn, the choke ball rapidly rebounds under the action of the spring to block the catheter, cutting off the arterial blood backflow path. Furthermore, a check valve is provided at the front end of the catheter, forming a mechanical one-way valve structure, further preventing blood backflow, significantly reducing the risk of backflow, and improving operational safety.

Description

Technical Field

[0001] This invention relates to the field of arterial puncture needle technology, and more specifically to an arterial puncture device that prevents backflow of blood. Background Technology

[0002] Arterial puncture is an important clinical procedure, widely used in critical care patients for blood gas analysis, electrolyte monitoring, continuous arterial blood pressure monitoring, and emergency fluid resuscitation. As the core instrument for this procedure, the arterial puncture needle must ensure a high success rate while effectively preventing complications such as contamination, infection, and hematoma caused by backflow of blood. In recent years, to improve safety and ease of operation, various arterial puncture devices with anti-backflow functions have been developed and put into use. These devices utilize built-in spring valves, one-way diaphragms, or magnetic sealing structures to achieve automatic closure of the channel, aiming to quickly block blood flow after the needle core is removed.

[0003] A search revealed that invention CN221512106U discloses an arterial puncture needle with anti-backflow design. Through the design of a blocking component, it utilizes components such as a blocking ball and spring to switch between blocking and patency of the connecting tube, allowing for adjustments during backflow. Compared to existing devices, this is more convenient in terms of adjustment. However, its anti-backflow mechanism is located inside the central channel of the puncture needle, occupying valuable lumen space. This makes it incompatible with guidewires, catheters, or other interventional instruments for subsequent operations via indwelling catheters, limiting its application in complex interventional scenarios. Furthermore, there is a response delay between needle core withdrawal and the complete closure of the anti-backflow mechanism, during which high-pressure arterial blood may splash, causing blood leakage, environmental pollution, and patient discomfort. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a device for preventing backflow during arterial puncture.

[0005] The technical solution is as follows: A device for preventing backflow of blood during arterial puncture includes a housing, a catheter fixedly disposed inside the housing along the puncture direction, an indwelling needle fixedly installed on the front side of the housing, the catheter and the indwelling needle being connected, and a puncture needle inserted into the indwelling needle; the housing is provided with a flow-blocking mechanism for preventing backflow of blood, the flow-blocking mechanism including a pneumatic cylinder fixedly disposed on the top of the housing, the pneumatic cylinder being divided into two non-communicating cavities, the front cavity of the pneumatic cylinder being connected to the catheter, a blocking ball being slidably disposed in the front cavity of the pneumatic cylinder, the blocking ball being used to block the pipe connecting the catheter to the pneumatic cylinder, a spring being provided between the inner wall of the pneumatic cylinder and the blocking ball, and the pneumatic cylinder... A first piston is slidably and sealed inside the rear cavity of the pneumatic cylinder, and a second piston is slidably and sealed inside the front cavity of the pneumatic cylinder. The piston rod of the second piston slidably and sealed through the cylinder wall of the pneumatic cylinder and the piston head of the first piston. An annular airbag is fixedly installed inside the tube wall near the side where the puncture needle penetrates the conduit. The rear cavity of the pneumatic cylinder and the annular airbag are connected by a trachea. A push block is slidably connected to the top of the outer shell, and a connecting rod is fixedly connected to the push block. The connecting rod is connected to the piston rod of the first piston. Rubber strips are fixedly installed on both outer walls of the outer shell. The two ends of the push block are in interference contact with the corresponding rubber strips on the same side. The contact surfaces of the push block and the rubber strips are provided with useful... Due to the increased friction caused by the sawtooth pattern, the frictional force between the pusher and the rubber strip is greater than the total resistance required to push the first and second pistons to their maximum stroke. Before arterial puncture, the puncture needle is inserted into the catheter, so that the needle tip passes the annular balloon but has not yet reached the occlusion bulb. The medical staff then pushes the pusher, and the connecting rod on the pusher moves the first piston backward. The first piston discharges the gas in the rear chamber of the pneumatic cylinder into the annular balloon, causing the annular balloon to expand inward and gradually envelop the puncture needle. After the first piston moves backward a certain distance, its piston head will drive the second piston to move backward. The backward movement of the second piston reduces the air pressure in the front chamber of the pneumatic cylinder, and the air pressure between the catheter and the pneumatic cylinder will push the occlusion bulb. The balloon, which is inserted into the catheter, slides into the pneumatic cylinder. Simultaneously, the spring is compressed, allowing the puncture needle to pass smoothly through the catheter and into the indwelling needle. After arterial puncture is completed using the indwelling needle and puncture needle, the pusher is pushed forward. The pusher then drives the first and second pistons to reset, causing the gas in the annular balloon to flow back into the rear chamber of the pneumatic cylinder. The air pressure in the front chamber of the pneumatic cylinder increases, and the balloon is no longer affected by the pressure difference. Under the action of the spring, it is pressed against the puncture needle. When the puncture needle is pulled out of the indwelling needle, the balloon loses its support as it passes through the needle and quickly rebounds under the action of the spring, sealing the catheter and preventing backflow of arterial blood when the puncture needle is withdrawn.

[0006] Furthermore, locking blocks are fixedly installed on both sides of the needle tube at the end of the puncture needle away from the needle tip, and docking frames are fixedly connected to the outer walls of both sides of the outer shell. The docking frames are open on the side where the puncture needle is inserted, and the docking frames are used to engage with the locking blocks. The docking frames and the locking blocks are in interference contact.

[0007] Furthermore, a check valve is fixedly installed inside the tube wall near the indwelling needle at the front end of the catheter. The check valve has multiple valve discs and is used to unidirectionally stop blood backflow. A push ring for opening the check valve is provided on the tube wall of the catheter. A guide frame is fixedly connected between the outer shell and the catheter. A drive component for driving the push ring is provided on the guide frame. The drive component drives the push ring to move, thereby controlling whether the push ring squeezes the check valve, realizing manual control of the opening and closing of the check valve for operation of external blood processing devices.

[0008] Furthermore, the pushing ring is composed of a circular ring, a connecting shaft, and a sealing plate. The circular ring is slidably disposed on the inner wall of the conduit. The connecting shaft is fixedly connected to both sides of the circular ring. The conduit has symmetrical sliding openings on both sides of the conduit wall near the circular ring. A sealing plate is fixedly installed inside the sliding opening of the conduit. The sealing plate is used to elastically seal the sliding opening of the conduit. The connecting shaft is connected to the sealing plate on the same side.

[0009] Furthermore, the driving component includes a rotating ring, a connecting ring, and a fixing rod. The rotating ring is rotatably connected to the front side of the outer wall of the conduit, and the connecting ring is rotatably connected to the rear side of the outer wall of the conduit. The rotating ring and the connecting ring are fixedly connected as a whole by multiple fixing rods. The guide frame has a groove adapted to the fixing rod, and the fixing rod slides through the groove of the guide frame. The connecting ring has inclined grooves on both sides. The connecting shaft of the pushing ring is located in the inclined grooves on both sides of the connecting ring. The front end of the rotating ring is fixedly connected to a toothed ring, and a gear that meshes with the toothed ring is rotatably connected to the side wall of the outer shell. By rotating the gear, the gear meshing drives the toothed ring and the rotating ring to rotate. The rotating ring drives the connecting ring to rotate synchronously through the fixing rod. The inclined groove on the connecting ring squeezes the connecting shaft towards the check valve, causing the ring to squeeze the check valve and change the check valve from a naturally closed state to an open state.

[0010] Furthermore, a fixing frame is fixedly connected to the inner wall of the outer shell near the rotating ring. The fixing frame is sleeved on the outer side of the rotating ring. A retaining ball supported by an elastic element is provided on the fixing frame. Multiple retaining grooves for the retaining ball are spaced apart circumferentially on the outer wall of the rotating ring. The retaining ball is used to engage with the retaining grooves to lock the adjusted drive component, so that the push ring always opens the stop valve, thereby maintaining the open state of the stop valve.

[0011] Furthermore, a binding mechanism is provided at the bottom of the outer shell. The binding mechanism is used to fix the puncture device to the patient's puncture site. The binding mechanism includes a support plate, an insert plate, and a buckle. The support plate is located at the bottom of the outer shell. The insert plate is rotatably connected to the front end of the support plate. A retaining frame is fixedly connected to the bottom of the outer shell. The retaining frame is used for inserting and engaging the insert plate. A buckle is fixedly installed at the rear end of the support plate. The buckle is used to bind the patient's puncture position.

[0012] Furthermore, an anti-slip pad is fixedly installed at the bottom of the support plate. The anti-slip pad is used to increase the friction between the support plate and the patient's skin, thereby improving the stability of the puncture device during use.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This invention uses a flow-blocking mechanism consisting of a pneumatically driven occlusion ball and a spring. When the puncture needle is pulled out, the occlusion ball quickly rebounds under the action of the spring to block the catheter, cutting off the arterial blood return path. A check valve is also set at the front end of the catheter to form a mechanical one-way valve structure, which further prevents blood backflow, significantly reduces the risk of blood return, and improves the safety of operation.

[0014] 2. This invention uses a gear ring inclined groove drive mechanism, which allows medical staff to actively open the stop valve to connect to external blood processing equipment. After the operation is completed, the valve automatically resets and closes, thus balancing functionality and safety.

[0015] 3. The driving component of the present invention is provided with an elastic locking structure of a ball and a groove to ensure that the valve opening state is reliably locked, avoiding accidental closure due to vibration or movement, and improving the reliability of clinical use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram showing the shell, catheter, indwelling needle, and puncture needle of the present invention in their separated states.

[0018] Figure 3 This is a schematic diagram of the outer shell, pusher, rubber strip, and flow-blocking mechanism of the present invention.

[0019] Figure 4 This is a cross-sectional view of the outer casing and the air cylinder of the present invention.

[0020] Figure 5 This is a diagram showing the connection relationship of specific components of the conduit and flow-blocking mechanism of the present invention.

[0021] Figure 6 This is a diagram showing the connection relationship between the conduit, guide frame, drive component, gear ring, and gear of the present invention.

[0022] Figure 7This is an exploded view of the specific components of the conduit, push ring, and drive element of the present invention.

[0023] Figure 8 This is a schematic diagram of the circular annular stop valve of the present invention in its open state.

[0024] Figure 9 This is a three-dimensional structural diagram of the outer shell, support plate, and buckle of the present invention.

[0025] Figure 10 This is an exploded view of the specific components of the outer shell, anti-slip pad, and binding mechanism of the present invention.

[0026] Reference numerals: 1. Outer shell; 2. Catheter; 3. Indwelling needle; 4. Puncture needle; 5. Clamping block; 51. Docking frame; 6. Flow control mechanism; 61. Pneumatic cylinder; 62. Occlusion ball; 63. Spring; 64. First piston; 65. Second piston; 66. Annular airbag; 67. Trachea; 7. Push block; 71. Connecting rod; 8. Rubber strip; 9. Check valve; 10. Push ring; 101. Circular ring; 1 02. Coupling, 103. Sealing plate, 11. Guide frame, 12. Driving component, 121. Rotating ring, 122. Connecting ring, 123. Fixing rod, 124. Inclined groove, 13. Fixing frame, 131. Ball clamp, 132. Slot, 14. Gear ring, 141. Gear, 15. Binding mechanism, 151. Support plate, 152. Insert plate, 153. Frame, 154. Buckle, 16. Anti-slip pad. Detailed Implementation

[0027] The preferred technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] A device for preventing backflow during arterial puncture, see [link / reference] Figures 1-5As shown, the device includes an outer shell 1, inside which a catheter 2 is fixedly installed along the puncture direction. An indwelling needle 3 is fixedly installed on the front side of the outer shell 1. The catheter 2 and the indwelling needle 3 are connected, and a puncture needle 4 is inserted into the indwelling needle 3. A flow-blocking mechanism 6 for preventing backflow is provided on the outer shell 1. The flow-blocking mechanism 6 includes a pneumatic cylinder 61 fixedly installed on the top of the outer shell 1. The pneumatic cylinder 61 is divided into two non-communicating chambers. The front chamber of the pneumatic cylinder 61 is connected to the catheter 2. A blocking ball 62 is slidably installed in the front chamber of the pneumatic cylinder 61 to block the pipe connecting the catheter 2 to the pneumatic cylinder 61. A spring 63 is provided between the inner wall of the pneumatic cylinder 61 and the blocking ball 62. A first piston 64 is slidably installed in the rear chamber of the pneumatic cylinder 61. A first piston 64 is slidably installed in the front chamber of the pneumatic cylinder 61. There is a second piston 65, whose piston rod slides through the cylinder wall of the pneumatic cylinder 61 and the piston head of the first piston 64. An annular airbag 66 is fixedly installed in the tube wall of the conduit 2 near the side where the puncture needle 4 is inserted. The rear cylinder cavity of the pneumatic cylinder 61 and the annular airbag 66 are connected by an air tube 67. A push block 7 is slidably connected to the top of the outer shell 1. A connecting rod 71 is fixedly connected to the push block 7. The connecting rod 71 is connected to the piston rod of the first piston 64. Rubber strips 8 are fixedly installed on both sides of the outer wall of the outer shell 1. The two ends of the push block 7 are in interference contact with the corresponding rubber strips 8 on the same side. The contact surfaces of the push block 7 and the rubber strips 8 are provided with serrations to increase friction. The friction between the push block 7 and the rubber strips 8 is greater than the total resistance required to push the first piston 64 and the second piston 65 to the maximum stroke.

[0029] See Figure 2 and Figure 3 As shown, the needle tube of the puncture needle 4 is fixedly installed with locking blocks 5 on both sides of the end away from the needle tip. The outer walls of the outer shell 1 are fixedly connected with docking frames 51. The docking frames 51 have an opening on the side where the puncture needle 4 is inserted. The docking frames 51 are used to engage with the locking blocks 5. The docking frames 51 and the locking blocks 5 are in interference contact.

[0030] When using this puncture device, the puncture needle 4 needs to be pre-loaded into the indwelling needle 3. During operation, the medical staff inserts the puncture needle 4 into the catheter 2 from the rear side of the outer shell 1, so that the needle tip of the puncture needle 4 passes the position of the annular balloon 66, but has not yet reached the sealing position of the occluding ball 62. At this time, the push block 7 on the top of the outer shell 1 is pushed. When the push block 7 moves, it drives the connecting rod 71 fixedly connected to it. The connecting rod 71 is connected to the piston rod of the first piston 64, thereby driving the first piston 64 to slide backward in the rear cavity of the air pressure cylinder 61 to seal. The first piston 64 pushes the gas in the rear cavity of the air pressure cylinder 61 into the annular balloon 66 through the trachea 67, causing the annular balloon 66 to expand inward and gradually wrap around the puncture needle 4. This action plays a pre-sealing role, reducing the blood that may be brought out when the puncture needle 4 moves later. When the first piston 64 moves backward a certain distance... The piston head contacts the piston rod of the second piston 65, and drives the second piston 65 to slide backward synchronously in the front cavity of the pneumatic cylinder 61. The backward movement of the second piston 65 increases the volume of the front cavity of the pneumatic cylinder 61 and decreases the air pressure. At this time, the air pressure in the conduit 2 is relatively high, forming an air pressure difference that pushes the blocking ball 62 in the front cavity of the pneumatic cylinder 61. The blocking ball 62 slides from the pipe opening where the conduit 2 connects to the pneumatic cylinder 61 into the front cavity of the pneumatic cylinder 61. At the same time, it compresses the spring 63 set between the inner wall of the pneumatic cylinder 61 and the blocking ball 62. After the blocking ball 62 leaves the conduit 2, the conduit 2 channel is unobstructed, and the puncture needle 4 can pass smoothly through the conduit 2 and penetrate into the indwelling needle 3 connected to the conduit 2. At the same time, the locking block 5 on the puncture needle 4 slides and locks onto the docking frame 51, improving the stability of the puncture needle 4 pre-loaded into the indwelling needle 3.

[0031] After arterial puncture is completed using indwelling needle 3 and puncture needle 4, and puncture needle 4 is inserted into the patient's blood vessel, when it is necessary to remove puncture needle 4, the medical staff first pushes the push block 7 forward. The push block 7, through the connecting rod 71, sequentially drives the first piston 64 and the second piston 65 to reset. When the first piston 64 moves forward, the gas in the annular airbag 66 flows back to the rear cavity of the air cylinder 61 through the trachea 67. The annular airbag 66 contracts and disengages from the puncture needle 4. At the same time, the second piston 65 resets forward, restoring the air pressure in the front cavity of the air cylinder 61. Normally, the occlusion bulb 62 is no longer affected by the air pressure difference and is pushed out of the front cavity of the air cylinder 61 under the action of the spring 63, and is squeezed again on the surface of the puncture needle 4 in the catheter 2. At this time, the medical staff will then pull the puncture needle 4 out of the indwelling needle 3. When the needle body of the puncture needle 4 passes through the occlusion bulb 62, the occlusion bulb 62 loses the support of the puncture needle 4 and rebounds quickly under the action of the spring 63, completely blocking the catheter 2, thereby blocking the arterial blood flow immediately before the puncture needle 4 is completely withdrawn, and avoiding the occurrence of backflow.

[0032] See Figure 7 and Figure 8As shown, a check valve 9 is fixedly installed inside the tube wall near the indwelling needle 3 at the front end of the catheter 2. The check valve 9 is equipped with multiple valve discs and is used to unidirectionally cut off blood backflow. A push ring 10 for opening the check valve 9 is provided on the tube wall of the catheter 2. A guide frame 11 is fixedly connected between the outer shell 1 and the catheter 2. A drive component 12 for driving the push ring 10 is provided on the guide frame 11. The drive component 12 drives the push ring 10 to move, thereby controlling whether the push ring 10 squeezes the check valve 9, realizing manual control of the opening and closing of the check valve 9 for the operation of external blood processing devices.

[0033] See Figures 6-8 As shown, the push ring 10 is composed of a circular ring 101, a connecting shaft 102, and a sealing plate 103. The circular ring 101 is slidably disposed on the inner wall of the conduit 2. The connecting shaft 102 is fixedly connected to both sides of the circular ring 101. The conduit 2 has symmetrical sliding openings on both sides of the pipe wall near the circular ring 101. The sealing plate 103 is fixedly installed in the sliding opening of the conduit 2. The sealing plate 103 is used to elastically seal the sliding opening of the conduit 2. The connecting shaft 102 is connected to the sealing plate 103 on the same side.

[0034] See Figure 6 and Figure 7 As shown, the driving component 12 includes a rotating ring 121, a connecting ring 122, and a fixing rod 123. The rotating ring 121 is rotatably connected to the front side of the outer wall of the conduit 2, and the connecting ring 122 is rotatably connected to the rear side of the outer wall of the conduit 2. The rotating ring 121 and the connecting ring 122 are fixedly connected to each other as a whole by multiple fixing rods 123. The guide frame 11 is provided with a sliding groove adapted to the fixing rod 123. The fixing rod 123 slides through the sliding groove of the guide frame 11. The connecting ring 122 is provided with inclined grooves 124 on both sides. The connecting shaft 102 of the pushing ring 10 is located in the inclined grooves 124 on both sides of the connecting ring 122. The front end of the rotating ring 121 is fixedly connected to a toothed ring 14. The side wall of the outer shell 1 is rotatably connected to a gear 141 that meshes with the toothed ring 14.

[0035] See Figure 6 and Figure 7 As shown, a fixing frame 13 is fixedly connected to the inner wall of the outer casing 1 near the rotating ring 121. The fixing frame 13 is sleeved on the outer side of the rotating ring 121. A retaining ball 131 supported by an elastic element is provided on the fixing frame 13. Multiple retaining grooves 132 that are adapted to the retaining ball 131 are spaced apart circumferentially on the outer wall of the rotating ring 121. The retaining ball 131 is used to engage with the retaining groove 132 to lock the adjusted drive member 12, so that the push ring 10 always opens the stop valve 9, thereby keeping the stop valve 9 in the open state.

[0036] When connecting blood processing instruments such as syringes or extension tubes, medical personnel rotate the gear 141 connected inside the side wall of the outer casing 1. The gear 141 meshes with the toothed ring 14, thereby driving the toothed ring 14 and the rotating ring 121 to rotate. When the rotating ring 121 rotates, it synchronously drives the connecting ring 122 to rotate through the fixed rod 123. The connecting ring 122 has inclined grooves 124 on both sides. When the connecting ring 122 rotates, the inclined grooves 124 drive the connecting shaft 102 of the push ring 10 to move along the axial direction of the catheter 2. When the connecting shaft 102 moves, it drives the ring 101 to press the valve disc of the check valve 9 forward, so that the check valve 9 changes from the naturally closed state to the open state. When the rotating ring 121 rotates to the position, the locking ball 131 is locked into the corresponding locking groove 132 under the action of the elastic element, locking the adjusted drive element 12, so that the push ring 10 always keeps the check valve 9 open for operation. After the operation is completed, rotating the gear 141 in the opposite direction will reset the check valve 9 to close under its own elasticity.

[0037] See Figure 9 and Figure 10 As shown, a binding mechanism 15 is provided at the bottom of the outer shell 1. The binding mechanism 15 is used to fix the puncture device to the patient's puncture site. The binding mechanism 15 includes a support plate 151, an insert plate 152 and a buckle 154. The support plate 151 is provided at the bottom of the outer shell 1. The insert plate 152 is rotatably connected to the front end of the support plate 151. A retaining frame 153 is fixedly connected to the bottom of the outer shell 1. The retaining frame 153 is used for inserting and engaging the insert plate 152. The buckle 154 is fixedly installed at the rear end of the support plate 151. The buckle 154 is used to bind the patient's puncture position.

[0038] See Figure 10 As shown, an anti-slip pad 16 is fixedly installed at the bottom of the support plate 151. The anti-slip pad 16 is used to increase the friction between the support plate 151 and the patient's skin, thereby improving the stability of the puncture device during use.

[0039] Throughout the puncture and use process, the binding mechanism 15 at the bottom of the outer shell 1 provides stable support, the anti-slip pad 16 at the bottom of the support plate 151 conforms to the patient's skin, the buckle 154 at the rear end of the support plate 151 bypasses the limb binding, and the insert plate 152 at the front end of the support plate 151 is inserted into the clip frame 153 at the bottom of the outer shell 1 to fix the outer shell 1 and the support plate 151 in place, ensuring that the entire device will not shift during operation, thereby improving the puncture success rate and the stability of use.

[0040] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An anti-backflow arterial puncture device, comprising a housing (1), wherein a catheter (2) is provided inside the housing (1), and an indwelling needle (3) communicating with the catheter (2) is installed on the front side of the housing (1), wherein a puncture needle (4) is inserted into the indwelling needle (3). characterized in that The outer shell (1) is provided with a flow-blocking mechanism (6), which includes a pneumatic cylinder (61) provided on the outer shell (1). The pneumatic cylinder (61) is divided into two cylinders, front and rear. The front cylinder of the pneumatic cylinder (61) is connected to the conduit (2). A blocking ball (62) for blocking the conduit (2) is slidably provided in the front cylinder of the pneumatic cylinder (61). A spring (63) is provided between the pneumatic cylinder (61) and the blocking ball (62). A first piston (64) is slidably installed in the rear cylinder of the pneumatic cylinder (61). A second piston (65) is slidably installed in the front cylinder of the pneumatic cylinder (61). The piston rod of the second piston (65) seals through the cylinder wall of the pneumatic cylinder (61) and the piston head of the first piston (64). An annular airbag (66) is provided in the conduit (2). An air tube (67) is connected between the rear cylinder of the pneumatic cylinder (61) and the annular airbag (66). A push block (7) is slidably connected to the outer shell (1), and a connecting rod (71) is fixedly connected to the push block (7). The connecting rod (71) is connected to the first piston (64). Rubber strips (8) are provided on both sides of the outer wall of the outer shell (1). The push block (7) and the rubber strip (8) on the same side are in interference contact.

2. An anti-backflow arterial puncture device according to claim 1, wherein The puncture needle (4) has locking blocks (5) fixedly installed on both sides of the needle tube at the end away from the needle tip. The outer walls of the outer shell (1) are fixedly connected to the docking frame (51). The docking frame (51) has an opening on the side where the puncture needle (4) is inserted. The docking frame (51) is used to engage with the locking block (5).

3. An anti-backflow arterial puncture device as defined in claim 2, wherein A check valve (9) is fixedly installed inside the tube wall near the indwelling needle (3) at the front end of the catheter (2). The check valve (9) is provided with multiple valve discs. The check valve (9) is used to cut off blood backflow in one direction. A push ring (10) for opening the check valve (9) is provided on the tube wall of the catheter (2). A guide frame (11) is fixed between the outer shell (1) and the catheter (2). A drive component (12) for driving the push ring (10) is provided on the guide frame (11).

4. An anti-backflow arterial puncture device as defined in claim 3, wherein The push ring (10) is composed of a ring (101), a connecting shaft (102) and a sealing plate (103). The ring (101) is slidably disposed on the inner wall of the conduit (2). The connecting shaft (102) is fixedly connected to both sides of the ring (101). The conduit (2) has symmetrical sliding openings on both sides of the pipe wall near the ring (101). An elastic sealing plate (103) is fixedly installed in the sliding opening of the conduit (2). The connecting shaft (102) is connected to the sealing plate (103) on the same side.

5. An anti-backflow arterial puncture device as defined in claim 4, wherein, The driving component (12) includes a rotating ring (121), a connecting ring (122), and a fixing rod (123). The rotating ring (121) is rotatably connected to the front side of the outer wall of the conduit (2), and the connecting ring (122) is rotatably connected to the rear side of the outer wall of the conduit (2). The rotating ring (121) and the connecting ring (122) are fixed together as a whole by multiple fixing rods (123). The guide frame (11) is provided with a sliding groove adapted to the fixing rod (123). The fixing rod (123) slides through the sliding groove of the guide frame (11). The connecting ring (122) is provided with inclined grooves (124) on both sides. The connecting shaft (102) of the pushing ring (10) is located in the inclined grooves (124) on both sides of the connecting ring (122). The front end of the rotating ring (121) is fixedly connected with a toothed ring (14). The side wall of the outer shell (1) is rotatably connected with a gear (141) that meshes with the toothed ring (14).

6. An anti-backflow arterial puncture device as defined in claim 5, wherein, A fixing frame (13) is fixedly connected to the inner wall of the outer shell (1) near the rotating ring (121). A retaining ball (131) supported by an elastic element is provided on the fixing frame (13). Multiple slots (132) for matching the retaining ball (131) are spaced apart on the outer wall of the rotating ring (121) in a circumferential direction. The retaining ball (131) is used to be inserted into the slot (132).

7. An anti-backflow arterial puncture device as defined in claim 6, wherein The bottom of the outer shell (1) is provided with a binding mechanism (15), which is used to fix the puncture device to the puncture site of the patient. The binding mechanism (15) includes a support plate (151), an insert plate (152) and a buckle (154). The support plate (151) is provided at the bottom of the outer shell (1). The front end of the support plate (151) is rotatably connected to the insert plate (152). The bottom of the outer shell (1) is fixedly connected with a frame (153). The frame (153) is used for inserting and engaging the insert plate (152). The rear end of the support plate (151) is fixedly installed with a buckle (154).

8. An anti-backflow arterial puncture device as defined in claim 7, wherein, An anti-slip pad (16) is fixedly installed on the bottom of the support plate (151).

Images