A device for accelerating blood return during vascular puncture

Abstract

This application discloses a device for accelerating blood return during vascular puncture, including a cavity and a first core rod. The cavity is used to match and connect with a puncture needle. A first elastic element and a first piston connected to the first elastic element are disposed within the cavity. An unlockable locking structure is provided between the first core rod and the cavity. The first core rod is fixedly connected to the first piston. The first core rod pushes the first piston to compress the first elastic element within the cavity. The locking structure locks the first core rod in the cavity. After the puncture needle is inserted, releasing the locking state between the first core rod and the cavity can accelerate blood return. Before puncture, pressing the first core rod compresses the first elastic element and holds it in place by the locking structure between the cavity and the first core rod. As soon as the needle tip enters the skin, unlocking the locking structure can accelerate blood return. Based on the blood return and the position of the first piston in the cavity, it can be determined whether the needle tip has entered a blood vessel and whether it has entered an artery or a vein.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a device for accelerating blood return during vascular puncture. Background Technology

[0002] Vascular puncture is a commonly used clinical procedure for medical purposes such as blood drawing, laboratory testing, blood transfusion, intravenous infusion, and catheter insertion for angiography. It can also be used for interventional treatments. Common vascular punctures include cephalic vein puncture, cephalic vein puncture, median cubital vein puncture, brachial vein puncture, femoral vein puncture, femoral artery puncture, subclavian artery and vein puncture, and radial artery puncture. Clinically, it allows for quick, simple, and economical determination of the needle tip location, avoids the potential damage to blood vessels from repeated punctures, and greatly reduces patient pain and financial burden.

[0003] However, in current clinical vascular puncture procedures, determining whether the needle tip has entered a blood vessel and whether it is a vein or an artery mainly relies on two methods: experience-based judgment and ultrasound-guided puncture. Ultrasound-guided puncture involves medical staff observing the location of the blood vessel and needle tip using ultrasound. This method is expensive due to the cost of the equipment and is complex to operate, making it difficult to popularize. Experience-based judgment involves medical staff observing the blood return through the needle to determine whether the puncture has entered a blood vessel, and simultaneously observing blood flow and color to determine whether it is a vein or an artery. This method is widely used clinically due to the inexpensive equipment and simple operation. However, it is susceptible to problems such as slow or even no blood return due to high blood viscosity, thus prolonging the time required to determine whether the puncture was successful. This can lead to misjudgment by medical staff, causing the needle tip to penetrate the entire blood vessel. Furthermore, prolonged puncture time or multiple punctures can increase patient anxiety, potentially increasing psychological and physical discomfort. Summary of the Invention

[0004] In order to overcome at least one of the defects described in the prior art, this application provides a device for accelerating blood return during vascular puncture.

[0005] The technical solution adopted in this application to solve its problem is:

[0006] A device for accelerating blood return during vascular puncture, comprising:

[0007] A cavity, the cavity being used for mating and connecting with a puncture needle, the cavity containing a first elastic element and a first piston connected to the first elastic element; and

[0008] A first core rod, wherein an unlockable locking structure is provided between the first core rod and the cavity;

[0009] The first core rod is fixedly connected to the first piston. The first core rod pushes the first piston to compress the first elastic element in the cavity. The locking structure locks the first core rod in the cavity. After the puncture needle punctures the blood vessel, releasing the locking state between the first core rod and the cavity can accelerate blood return.

[0010] The vascular puncture accelerated blood return device provided in this application involves pressing the first core rod before puncture, compressing the first elastic element and maintaining it through a locking structure between the cavity and the first core rod. When the needle tip just enters the skin, the locking structure is unlocked, causing the first elastic element to rebound and push the first piston. The first piston creates a negative pressure state within the cavity. Since the needle tip has not yet entered the blood vessel, the first elastic element is affected by atmospheric pressure, resulting in a small rebound and the first elastic element remains compressed. When the needle tip enters the blood vessel, blood flows rapidly into the cavity under the negative pressure and fills it. The cavity allows the first elastic element to continue rebounding. When the needle tip enters a blood vessel, if it hits a venous valve, penetrates the blood vessel, or exits the blood vessel, the blood return will be interrupted, and the first elastic element will stop rebounding and be in an intermediate state. If the needle tip penetrates an artery, the blood will flow rapidly into the cavity under the action of arterial pressure and negative pressure in the cavity. The first elastic element will rebound quickly, and under the action of blood pressure, the position of the first piston will exceed the position before compression, which can accelerate the blood return. Based on the blood return and the position of the first piston in the cavity, it is determined whether it has entered a blood vessel, and whether it has entered an artery or a vein.

[0011] Furthermore, a blood return observation area is provided at the connection end between the cavity and the puncture needle.

[0012] Furthermore, the cavity is a transparent part, and the cavity is provided with a needle tip position mark for observing the position of the first piston to identify the position of the puncture needle.

[0013] Furthermore, the puncture needle is provided with a first Luer interface, and the cavity is provided with a second Luer interface that matches and connects to the first Luer interface.

[0014] Furthermore, the end of the first core rod is provided with a first core rod handle for pressing the first core rod.

[0015] Furthermore, the locking structure includes a locking member disposed on the first core rod and a locking hole and a switch disposed on the cavity. The locking member can be locked in the locking hole and unlocked by the switch.

[0016] Furthermore, it also includes a pressing linkage mechanism for adjusting the operating mode;

[0017] The pressing linkage mechanism includes a pressing linkage movably connected to the cavity and a pressing block disposed on one side of the connection between the puncture needle and the cavity. The pressing linkage is connected to the pressing block so that pressing the pressing block drives the pressing linkage to rotate. The pressing linkage touches the switch to unlock the locking structure.

[0018] Furthermore, the locking structure includes a flexible tube disposed within the cavity for communicating with the external cavity and the internal cavity, and an air valve switch disposed on the cavity for controlling the opening and closing of the flexible tube.

[0019] Furthermore, a suction chamber and a cylinder chamber are arranged in parallel within the cavity, and the first elastic element, the first piston, and the first core rod are disposed within the suction chamber;

[0020] The cavity is provided with a valve switch that communicates with the cylinder cavity. The cylinder cavity is provided with a second elastic element, a second piston, and a second core rod. The locking structure includes the cylinder cavity, the valve switch, the second elastic element, the second piston, and the second core rod.

[0021] The second piston is connected to the second elastic element and the second core rod respectively. The second core rod limits the first core rod to control the air pressure change of the suction chamber and adjust the acceleration of blood return.

[0022] Furthermore, the cavity is provided with an anti-reverse valve that connects to the cylinder chamber for exhaust.

[0023] Furthermore, a suction chamber and a cylinder chamber are arranged in parallel within the cavity, and the first elastic element, the first piston, and the first core rod are disposed within the suction chamber;

[0024] The cavity is provided with a valve switch and an anti-reverse valve that are externally connected to the cylinder cavity for remote control. The valve switch controls the opening and closing of the anti-reverse valve. The cylinder cavity is provided with a second elastic element, a second piston, and a second core rod. The locking structure includes the cylinder cavity, the valve switch, the second elastic element, the second piston, and the second core rod.

[0025] The second piston is connected to the second elastic element and the second core rod respectively. The second core rod limits the first core rod to control the air pressure change of the suction chamber and adjust the acceleration of blood return.

[0026] Furthermore, the air valve switch and the anti-reverse valve are connected to the cavity via flexible hoses.

[0027] Furthermore, a suction chamber and a cylinder chamber are arranged in parallel within the cavity, and the first elastic element, the first piston, and the first core rod are disposed within the suction chamber;

[0028] The cavity is provided with a flexible tube that communicates with the cylinder cavity. A tube clamp for controlling the opening and closing of the flexible tube is sleeved on the flexible tube. The cylinder cavity is provided with a second elastic element, a second piston, and a second core rod. The locking structure includes the cylinder cavity, the air valve switch, the second elastic element, the second piston, and the second core rod.

[0029] The second piston is connected to the second elastic element and the second core rod respectively. The second core rod limits the first core rod to control the air pressure change of the suction chamber and adjust the acceleration of blood return.

[0030] Furthermore, the end of the hose is connected to a stop head that prevents the catheter clamp from sliding out.

[0031] Furthermore, a first retaining ring is provided in the suction chamber to limit the travel of the first core rod, and a second retaining ring is provided in the cylinder chamber to limit the travel of the second core rod.

[0032] Furthermore, the end of the second core rod is provided with a limiting baffle for pressing the second core rod and limiting the first core rod.

[0033] In summary, the vascular puncture accelerated blood return device of this application has the following technical effects:

[0034] Before puncture, the first core rod is pressed, compressing the first elastic element and maintaining it through the locking structure between the cavity and the first core rod. When the needle tip just enters the skin, the locking structure is unlocked, causing the first elastic element to rebound and push the first piston. The first piston creates a negative pressure state in the cavity. Since the needle tip has not entered the blood vessel, the first elastic element is affected by atmospheric pressure, resulting in a small rebound, and the first elastic element remains compressed. When the needle tip enters the blood vessel, blood flows rapidly into the cavity under the negative pressure and fills the cavity, causing the first elastic element to continue to rebound. If the needle tip hits a venous valve, penetrates the blood vessel, or exits the blood vessel after entering the blood vessel, the blood return will be interrupted, and the first elastic element will stop rebounding, remaining in an intermediate state. If the needle tip penetrates an artery, blood flows rapidly into the cavity under the action of arterial pressure and the negative pressure of the cavity, and the first elastic element will quickly rebound. Under the action of blood pressure, the position of the first piston will exceed its previous compressed position, which can accelerate the blood return. Based on the blood return, the position of the first piston in the cavity determines whether it has entered a blood vessel, and whether it has entered an artery or a vein.

[0035] Other technical effects of this application are indicated in the specification in conjunction with the specific structure. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the vascular puncture accelerated blood return device of this application;

[0037] Figure 2 This is a cross-sectional view of the locking structure in the first embodiment of this application when it is locked.

[0038] Figure 3 This is a cross-sectional schematic diagram of the unlocking and locking structure after the puncture needle tip enters the skin in Embodiment 1 of this application;

[0039] Figure 4 This is a schematic cross-sectional view of the puncture needle tip entering a vein in Embodiment 1 of this application.

[0040] Figure 5 This is a schematic cross-sectional view of the puncture needle tip entering the arterial vessel in Embodiment 1 of this application;

[0041] Figure 6 This is a schematic diagram of the second embodiment of the vascular puncture accelerated blood return device of this application;

[0042] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the vascular puncture accelerated blood return device of this application;

[0043] Figure 8 This is a cross-sectional view of the locking structure in the locked position according to Embodiment 3 of this application;

[0044] Figure 9 This is a schematic diagram of the fourth embodiment of the vascular puncture accelerated blood return device of this application;

[0045] Figure 10 This is a cross-sectional view of the locking structure in the fourth embodiment of this application when it is locked.

[0046] Figure 11 This is a cross-sectional schematic diagram of the unlocking and locking structure after the puncture needle tip enters the skin in Embodiment 4 of this application;

[0047] Figure 12 This is a schematic cross-sectional view of the puncture needle tip entering a vein in Embodiment 4 of this application.

[0048] Figure 13 This is a schematic cross-sectional view of the puncture needle tip entering the arterial vessel in Embodiment 4 of this application;

[0049] Figure 14 This is a schematic diagram of the fifth embodiment of the vascular puncture accelerated blood return device of this application;

[0050] Figure 15 This is a cross-sectional view of the locking structure in the fifth embodiment of this application when it is locked.

[0051] Figure 16 This is a schematic diagram of the structure of Embodiment 6 of the vascular puncture accelerated blood return device of this application;

[0052] Figure 17 This is a cross-sectional view of the locking structure in Embodiment 6 of this application when it is unlocked before puncture.

[0053] The meanings of the reference numerals in the attached figures are explained as follows:

[0054] 1. Puncture needle; 101. Puncture needle seat; 102. Puncture needle tube; 2. Cavity; 201. Aspiration chamber; 202. First retaining ring; 203. Cylinder chamber; 204. Second retaining ring; 205. Blood return observation area; 206. Needle tip position indicator; 207. Locking hole; 208. Switch; 3. First core rod; 301. Clamping element; 302. First core rod handle; 303. First core rod retaining ring; 4. First elastic element; 5. First piston; 6. Pressing connecting rod; 7. Pressing block; 8. Air valve switch; 9. Second elastic element; 10. Second piston; 11. Second core rod; 1101. Limiting baffle; 1102. Second core rod retaining ring; 12. Anti-reverse valve; 13. Tube; 14. Catheter clamp; 15. Locking head. Detailed Implementation

[0055] To better understand and implement this application, the technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings.

[0056] In the description of this application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0058] See Figure 1-11This application provides a device for accelerating blood return during vascular puncture, including a cavity 2 and a first core rod 3. The cavity 2 is matched and connected to a puncture needle 1. A first elastic element 4 and a first piston 5 connected to the first elastic element 4 are provided inside the cavity 2. An unlockable locking structure is provided between the first core rod 3 and the cavity 2. The first core rod 3 and the first piston 5 are fixedly connected. The first core rod 3 pushes the first piston 5 to compress the first elastic element 4 inside the cavity. The locking structure locks the first core rod 3 in the cavity 2. After the puncture needle 1 punctures the blood vessel, the locking state between the first core rod 3 and the cavity 2 is released to accelerate blood return. The vascular puncture accelerated blood return device provided in this application involves pressing the first core rod 3 before puncture, compressing the first elastic element 4 and maintaining it through a locking structure between the cavity 2 and the first core rod 3. When the puncture needle 1 just enters the skin, the locking structure is unlocked, causing the first elastic element 4 to rebound and push the first piston 5. The first piston 5 creates a negative pressure state within the cavity 2. Since the needle tip has not yet entered the blood vessel, the first elastic element 4 is affected by atmospheric pressure, resulting in a small rebound amount, and the first elastic element 4 remains compressed. When the needle tip enters the blood vessel, the blood flows rapidly into the cavity 2 under the negative pressure. The cavity 2 is filled, allowing the first elastic element 4 to continue to rebound. When the needle tip enters a blood vessel, if it hits a venous valve, penetrates the blood vessel, or exits the blood vessel, the blood return will be interrupted, and the first elastic element 4 will stop rebounding and be in an intermediate state. If the needle tip penetrates an artery, the blood will flow rapidly into the cavity 2 under the action of arterial pressure and negative pressure in the cavity. The first elastic element 4 will rebound rapidly, and under the action of blood pressure, the position of the first piston 5 will exceed the position before compression, which can accelerate the blood return. Based on the blood return situation and the position of the first piston 5 in the cavity, it is determined whether it has entered a blood vessel and whether it has entered an artery or a vein.

[0059] The puncture needle 1 includes a puncture needle tube 101 and a puncture needle seat 102, with the puncture needle seat 102 connecting and fixing the puncture needle tube 101. Here, puncture needle 1 refers to the general term for needles used in medical procedures for puncture operations.

[0060] The locking structure can use methods such as snap-locking, cylinder locking, or electromagnet locking to maintain the elastic potential energy of the elastic element. The elastic force of the elastic element should be appropriate and not too large. If it is too large, it will directly overcome the influence of atmospheric pressure and return to its original shape, thus losing the function of setting up the elastic element.

[0061] Specifically, the connection end between the cavity 2 and the puncture needle 1 is provided with a blood return observation area 205 to facilitate observation of the blood return situation.

[0062] In a preferred embodiment, the cavity 2 is transparent, and a needle tip position marker 206 is provided on the cavity 2 for observing the position of the first piston 5 to identify the puncture needle 1. The needle tip position marker 206 includes marker a, marker b, and marker c. Marker a is the position displayed in the cavity 2 after the locking and unlocking structure is unlocked after puncture, and the first elastic member 4 pushes the first piston 5; marker b is the position displayed in the cavity 2 after puncture into a vein, and the first elastic member pushes the first piston 5; marker c is the position displayed in the cavity 2 after puncture into an artery, and the arterial pressure pushes the first piston 5.

[0063] In a preferred embodiment, the puncture needle 1 is provided with a first Luer interface, and the cavity 2 is provided with a second Luer interface that matches and connects to the first Luer interface, so that the connection position can be sealed after the puncture needle 1 and the cavity 2 are connected.

[0064] In addition, a first retaining ring 202 is provided in the suction chamber 201 of the cavity 2 to limit the movement of the first core rod 3, and a first core rod retaining ring 303 is provided on the first core rod 3 in response to the first retaining ring 202, so as to ensure that the first core rod 3 will not easily slip off the cavity 2.

[0065] After the puncture is completed, the cavity 2 of the device can be separated from the puncture needle 1 so that the puncture needle 1 can complete subsequent operations.

[0066] Based on the above-described basic structure, the device described in this application is illustrated in the following specific embodiments:

[0067] Example 1

[0068] See Figure 1-5 The locking structure includes a clamping member 301 disposed on the first core rod 3, and a locking hole 207 and a switch 208 disposed on the cavity 2. The clamping member 301 can be engaged in the locking hole 207 and unlocked by the switch 208. The clamping member 301, the switch 208 and the locking hole 207 can all be symmetrically arranged in pairs on the first core rod 3 or the cavity 2.

[0069] Specifically, the end of the first core rod 3 is provided with a first core rod handle 302 for pressing the first core rod 3, so as to press and compress the first elastic member 4. The first elastic member 4 may be a spring.

[0070] Working principle:

[0071] (a) Before puncture, cavity 2 is connected to puncture needle 1.

[0072] (ii) Press down the first core rod handle 303 to compress the first elastic element 4, causing the locking element 301 of the first core rod 3 to engage in the locking hole 207 of the cavity 2 (e.g., Figure 1 As mentioned above, at this time, the pressure of the suction chamber 201 of the cavity 2 is the same as the atmospheric pressure, which is P0. Let the volume enclosed inside the suction chamber 201 at this time be V0.

[0073] (3) Perform the puncture operation. After the tip of the puncture needle 1 enters the human tissue, press the switch 208. The clamping member 301 of the first core rod 3 separates from the clamping hole 207. Under the action of elastic potential energy, the first elastic member 4 starts to reset. However, since the tip is inside the human tissue at this time and the suction chamber 201 is in a sealed state, when the first elastic member 4 rebounds, it causes a negative pressure in the suction chamber 201. Therefore, when the first elastic member 4 returns to a certain position (such as Figure 3 shown), due to the influence of atmospheric pressure, the first elastic member 4 is restricted. When reaching equilibrium, the first piston 5 stops moving, and the first piston 5 is located at the position of the marking line a. Assume that the air pressure in the suction chamber 201 at this time is P1 and the inner cavity volume is V1 (according to the ideal gas equation P0*V0 = P1*V1, after releasing the elastic potential energy switch, the volume of the suction chamber becomes larger, that is, V0 < V1, so P0 > P1); assume that the difference between the elastic force of the first elastic member 4 and the frictional resistance of the first piston is △F1, and the piston area is S1. Then the magnitude of the negative pressure in the suction chamber after equilibrium is: △P = P0 - P1 = △F1 / S1.

[0074] (4) When the tip penetrates into the vein, under the action of blood pressure and the negative pressure △P in the suction chamber 201, blood quickly flows into the suction chamber 201. After the blood enters and gradually fills the space of the suction chamber 201, since the volume of the air in the suction chamber 201 becomes smaller, according to the ideal gas equation, the gas pressure in the suction chamber 201 rises, denoted as P2 (P2 > P1). The force on the piston = P2*S1 + △F1 - P0*S1 (P2*S1 + △F1 > P0*S1). The first elastic member 4 continues to reset until the first piston 5 reaches the position of the marking line b (such as Figure 4 described), at this time a balance relationship is formed and the first piston 5 stops moving.

[0075] (5) When the tip enters the blood vessel and the first elastic member 4 is not fully reset (the first piston 5 has not reached the marking line b), if the tip hits the venous valve or penetrates or exits the blood vessel, the blood return will be interrupted, and a new balance will be formed between the air pressure and the elastic force, and the first piston 5 will be between the marking line a and the marking line b.

[0076] (6) If the tip enters the artery, blood will quickly flow into the suction chamber 201 under the action of arterial blood pressure and the negative pressure △P in the suction chamber 201. The first elastic member 4 will quickly bounce up, and under the action of arterial blood pressure, the position of the first piston 5 will exceed the position before compression and reach the position of the marking line c (such as Figure 5 shown).

[0077] (7) Medical staff can judge the position of the tip according to the blood return and the displacement of the first piston 5.

[0078] Embodiment 2

[0079] Refer to Figure 6 It also includes a pressing linkage mechanism for adjusting the operation mode; the pressing linkage mechanism includes a pressing linkage 6 movably connected to the cavity 2 and a pressing block 7 disposed on one side of the connection between the puncture needle 1 and the cavity 2. The pressing linkage 6 is connected to the pressing block 7 so that pressing the pressing block 7 drives the pressing linkage 6 to rotate, and the pressing linkage 6 triggers the switch 208 to unlock the locking structure. The pressing linkage 6 and the pressing block 7 can be arranged symmetrically in pairs.

[0080] Example 2 adds a pressing linkage mechanism to Example 1. During puncture, the pressing linkage 6 is held directly. When the needle tip enters the tissue, the pressing block 7 is pressed slightly, causing the pressing linkage 6 to rotate via the shaft. This transmits the pressing force to the switch 208, and pressing the switch 208 disengages the locking member 301 from the locking hole 202. This device is easy to operate with one hand, avoiding the problem of requiring two hands in Example 1, making the puncture process smoother and more continuous.

[0081] Example 3

[0082] See Figure 7 and Figure 8 Compared with Embodiment 1, Embodiment 3 differs in its locking structure. The locking structure includes a flexible tube 13 disposed within the cavity 2 for connecting the external part to the inner cavity of the cavity 2, and an air valve switch 8 disposed on the cavity 2 for controlling the opening and closing of the flexible tube 13. Pushing the small end face of the air valve switch 8 can clamp the flexible tube 13 in the device, disconnecting the suction chamber 201 from the inner cavity of the puncture needle 1. Other working principles are similar to those of Embodiment 1.

[0083] Example 4

[0084] See Figure 9-13 The cavity 2 has a suction chamber 201 and a cylinder chamber 203 arranged in parallel. The first elastic element 4, the first piston 5 and the first core rod 3 are arranged in the suction chamber 201. The cavity 2 is provided with a valve switch 8 that communicates with the cylinder chamber 203. The cylinder chamber 203 is provided with a second elastic element 9, a second piston 10 and a second core rod 11. The locking structure includes the cylinder chamber 203, the valve switch 8, the second elastic element 9, the second piston 10 and the second core rod 11. The second piston 10 is connected to the second elastic element 9 and the second core rod 11 respectively. The second core rod 11 limits the first core rod 3 to control the air pressure change of the suction chamber 201 and adjust the acceleration of blood return.

[0085] Specifically, the cavity 2 is provided with an anti-backflow valve 12 that connects to the cylinder cavity 203 for exhaust.

[0086] In addition, a second retaining ring 204 is provided in the cylinder chamber 203 to limit the movement stroke of the second core rod 11, and a second core rod retaining ring 1102 is provided on the second core rod 11 in response to the second retaining ring 204, to ensure that the second core rod 3 will not easily slip off the chamber 2.

[0087] In a preferred embodiment, the end of the second core rod 11 is provided with a limiting baffle 1101 for pressing the second core rod 11 and limiting the first core rod 3, which also facilitates pressing the second core rod 11. The first elastic member 4 and the second elastic member 9 can both be springs.

[0088] Working principle:

[0089] (1) Before puncture, cavity 2 is connected to puncture needle 1.

[0090] (2) Press the limit baffle 1101 to compress the second elastic element 9. During the compression process, the needle tip is connected to the outside, and the gas in the cylinder is controlled to be discharged through the anti-reverse valve 12.

[0091] (3) When the limit baffle 1101 is released, the first elastic element 4 and the second elastic element 9 both rebound. Since the anti-reverse valve 12 is closed, the cylinder cavity 203 is in a sealed state. During the reset process of the second elastic element 9, the cylinder cavity 203 generates negative pressure. The external atmospheric pressure will limit the rebound amount of the cylinder cavity. At this time, the second elastic element 9 can only recover a small distance. The first core rod 3 of the suction cavity 201 also only rebounds a small distance due to the restriction of the control limit baffle 1101.

[0092] (4) Perform puncture. After the needle tip punctures the human tissue, press the air valve switch 8. Atmospheric air enters the cylinder chamber 203 through the air valve switch 8, eventually making the air pressure in the cylinder chamber 203 equal to the atmospheric pressure. The second elastic element 9 will quickly return to its original position under the action of elastic force. The first core rod 3 of the suction chamber 201 will rebound further because it is freed from the restriction of the limiting baffle 1101. However, since the needle tip is inside the human tissue at this time, the suction chamber 201 is in a closed state, so a negative pressure will be formed inside the suction chamber 201. Under the action of atmospheric pressure, the first elastic element 4 can only recover a small distance. At this time, the position of the first piston 5 is marked as scale a.

[0093] (5) When the needle tip enters the vein, under the action of blood pressure and negative pressure ΔP in the suction chamber 201, the blood will flow rapidly into the suction chamber 201. After the blood enters and gradually fills the space of the suction chamber 201, the air volume in the suction chamber 201 becomes smaller. According to the standard gas equation, the gas pressure in the suction chamber 201 rises. When the force generated by the elastic force of the elastic element + the air pressure in the suction chamber 201 is greater than the external atmospheric pressure + frictional resistance, the first elastic element 4 continues to reset until the position of the mark b. At this time, a balance relationship is formed, and the first piston 5 stops moving.

[0094] (6) If the needle tip touches the venous valve, penetrates the blood vessel, or exits the blood vessel after the first elastic element 4 has not been fully reset (the first piston 5 has not reached the mark b), the blood return will be interrupted, the air pressure and elastic force will form a new balance, and the first piston 5 will be between the mark a and the mark b.

[0095] (7) If the needle tip enters the artery, under the action of arterial blood pressure and negative pressure ΔP in the suction chamber 201, the blood will flow rapidly to the suction chamber 201, the first elastic element 4 will bounce up quickly, and under the action of arterial blood pressure, the position of the first piston 5 will exceed the position before compression and reach the position of the mark c.

[0096] (8) Medical staff can determine the position of the needle tip based on the blood return and piston displacement.

[0097] Example 5

[0098] See Figure 14 and Figure 15 Compared with Example 4, Example 5 differs in that the anti-reverse valve 12 and the air valve switch 8 are externally connected to the cylinder chamber 203 of the cavity 2 via the hose 13. The air valve switch 8 controls the opening and closing of the anti-reverse valve 12 so that the air valve switch 8 can be remotely controlled by the other hand during the puncture operation to change the state of the anti-reverse valve 12 and adjust the air pressure of the cylinder chamber 203.

[0099] The working principle of this embodiment is the same as that of Embodiment 4.

[0100] Example 6

[0101] See Figure 16 and Figure 17 Compared with Example 4, Example 6 differs in that the anti-backflow valve 12 and the air valve switch 8 are replaced with a hose and a guide clamp. Specifically, a hose 13 is provided on the cavity 2 to connect to the cylinder cavity 203, and a guide clamp 14 is sleeved on the hose 13 to control the opening and closing of the hose 13. The end of the hose 13 is connected to a stop head 15 to prevent the guide clamp 14 from sliding out.

[0102] Before puncture, press the limiting baffle 1101. At this time, the catheter clamp 14 is in the open state so that the gas in the cylinder chamber 203 can be discharged. After the gas is discharged, close the catheter clamp 14. At this time, the second elastic element 9 rebounds, and a negative pressure is formed in the inner cavity of the cylinder chamber 203, which restricts the movement of the second piston 10. When the needle tip penetrates the skin, release the catheter clamp 14 so that the second core rod 11 rebounds, thereby freeing the first core rod 3 from the restriction of the limiting baffle 1101 and rebounding under the elastic force of the second elastic element 9, so that a negative pressure is formed in the inner cavity of the suction chamber 201. Other working principles are similar to those in Embodiment 4.

[0103] The technical means disclosed in this application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A device for accelerating blood return during vascular puncture, characterized in that, include: A cavity (2) for mating and connecting with a puncture needle (1), wherein a first elastic element (4) and a first piston (5) connected to the first elastic element (4) are disposed within the cavity (2); and The first core rod (3) and the cavity (2) are provided with an unlockable locking structure; Wherein, the first core rod (3) is fixedly connected to the first piston (5), the first core rod (3) pushes the first piston (5) to compress the first elastic element (4) in the cavity (2), the locking structure locks the first core rod (3) in the cavity (2), and the puncture needle (1) releases the locking state between the first core rod (3) and the cavity (2) after puncturing the blood vessel to accelerate blood return; The cavity (2) is provided with a suction chamber (201) and a cylinder chamber (203) arranged in parallel. The first elastic element (4), the first piston (5) and the first core rod (3) are arranged in the suction chamber (201). The cavity (2) is provided with a valve switch (8) that communicates with the cylinder cavity (203). The cylinder cavity (203) is provided with a second elastic element (9), a second piston (10) and a second core rod (11). The locking structure includes the cylinder cavity (203), the valve switch (8), the second elastic element (9), the second piston (10) and the second core rod (11). The second piston (10) is connected to the second elastic element (9) and the second core rod (11) respectively. The second core rod (11) limits the first core rod (3) to control the air pressure change of the suction chamber (201) and adjust the acceleration of blood return.

2. The device for accelerating blood return during vascular puncture according to claim 1, characterized in that, The cavity (2) and the puncture needle (1) are provided with a blood return observation area (205).

3. The device for accelerating blood return during vascular puncture according to claim 1, characterized in that, The cavity (2) is a transparent part, and the cavity (2) is provided with a needle tip position mark (206) for observing the position of the first piston (5) to identify the puncture needle (1).

4. The device for accelerating blood return during vascular puncture according to claim 1, characterized in that, The cavity (2) is provided with an anti-reverse valve (12) that connects to the cylinder cavity (203) for exhaust.

5. The device for accelerating blood return during vascular puncture according to claim 1, characterized in that, The suction chamber (201) is provided with a first retaining ring (202) that restricts the movement of the first core rod (3), and the cylinder chamber (203) is provided with a second retaining ring (204) that restricts the movement of the second core rod (11).

6. The vascular puncture accelerated blood return device according to claim 5, characterized in that, The end of the second core rod (11) is provided with a limiting baffle (1101) for pressing the second core rod (11) and limiting the first core rod (3).

7. A device for accelerating blood return during vascular puncture, characterized in that, include: A cavity (2) for mating and connecting with a puncture needle (1), wherein a first elastic element (4) and a first piston (5) connected to the first elastic element (4) are disposed within the cavity (2); and The first core rod (3) and the cavity (2) are provided with an unlockable locking structure; Wherein, the first core rod (3) is fixedly connected to the first piston (5), the first core rod (3) pushes the first piston (5) to compress the first elastic element (4) in the cavity (2), the locking structure locks the first core rod (3) in the cavity (2), and the puncture needle (1) releases the locking state between the first core rod (3) and the cavity (2) after puncturing the blood vessel to accelerate blood return; The cavity (2) is provided with a suction chamber (201) and a cylinder chamber (203) arranged in parallel. The first elastic element (4), the first piston (5) and the first core rod (3) are arranged in the suction chamber (201). The cavity (2) is provided with a valve switch (8) and an anti-reverse valve (12) that are externally connected to the cylinder cavity (203) for remote control. The valve switch (8) controls the opening and closing of the anti-reverse valve (12). The cylinder cavity (203) is provided with a second elastic element (9), a second piston (10) and a second core rod (11). The locking structure includes the cylinder cavity (203), the valve switch (8), the second elastic element (9), the second piston (10) and the second core rod (11). The second piston (10) is connected to the second elastic element (9) and the second core rod (11) respectively. The second core rod (11) limits the first core rod (3) to control the air pressure change of the suction chamber (201) and adjust the acceleration of blood return.

8. The device for accelerating blood return during vascular puncture according to claim 7, characterized in that, The cavity (2) and the puncture needle (1) are provided with a blood return observation area (205).

9. The device for accelerating blood return during vascular puncture according to claim 7, characterized in that, The cavity (2) is a transparent part, and the cavity (2) is provided with a needle tip position mark (206) for observing the position of the first piston (5) to identify the puncture needle (1).

10. The vascular puncture accelerated blood return device according to claim 7, characterized in that, The air valve switch (8) and the anti-reverse valve (12) are connected to the cavity (2) via a hose (13).

11. The vascular puncture accelerated blood return device according to claim 7, characterized in that, The suction chamber (201) is provided with a first retaining ring (202) that restricts the movement of the first core rod (3), and the cylinder chamber (203) is provided with a second retaining ring (204) that restricts the movement of the second core rod (11).

12. The vascular puncture accelerated blood return device according to claim 11, characterized in that, The end of the second core rod (11) is provided with a limiting baffle (1101) for pressing the second core rod (11) and limiting the first core rod (3).

13. A device for accelerating blood return during vascular puncture, characterized in that, include: A cavity (2) for mating and connecting with a puncture needle (1), wherein a first elastic element (4) and a first piston (5) connected to the first elastic element (4) are disposed within the cavity (2); and The first core rod (3) and the cavity (2) are provided with an unlockable locking structure; Wherein, the first core rod (3) is fixedly connected to the first piston (5), the first core rod (3) pushes the first piston (5) to compress the first elastic element (4) in the cavity (2), the locking structure locks the first core rod (3) in the cavity (2), and the puncture needle (1) releases the locking state between the first core rod (3) and the cavity (2) after puncturing the blood vessel to accelerate blood return; The cavity (2) is provided with a suction chamber (201) and a cylinder chamber (203) arranged in parallel. The first elastic element (4), the first piston (5) and the first core rod (3) are arranged in the suction chamber (201). The cavity (2) is provided with a flexible tube (13) that communicates with the cylinder cavity (203). A guide clamp (14) for controlling the opening and closing of the flexible tube (13) is sleeved on the flexible tube (13). The cylinder cavity (203) is provided with a second elastic element (9), a second piston (10) and a second core rod (11). The locking structure includes the cylinder cavity (203), the guide clamp (14), the second elastic element (9), the second piston (10) and the second core rod (11). The second piston (10) is connected to the second elastic element (9) and the second core rod (11) respectively. The second core rod (11) limits the first core rod (3) to control the air pressure change of the suction chamber (201) and adjust the acceleration of blood return.

14. The vascular puncture accelerated blood return device according to claim 13, characterized in that, The cavity (2) and the puncture needle (1) are provided with a blood return observation area (205).

15. The vascular puncture accelerated blood return device according to claim 13, characterized in that, The cavity (2) is a transparent part, and the cavity (2) is provided with a needle tip position mark (206) for observing the position of the first piston (5) to identify the puncture needle (1).

16. The vascular puncture accelerated blood return device according to claim 13, characterized in that, The end of the hose (13) is connected to a stop head (15) that prevents the catheter clamp (14) from sliding out.

17. The vascular puncture accelerated blood return device according to claim 13, characterized in that, The suction chamber (201) is provided with a first retaining ring (202) that restricts the movement of the first core rod (3), and the cylinder chamber (203) is provided with a second retaining ring (204) that restricts the movement of the second core rod (11).

18. The vascular puncture accelerated blood return device according to claim 17, characterized in that, The end of the second core rod (11) is provided with a limiting baffle (1101) for pressing the second core rod (11) and limiting the first core rod (3).

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