Blood taking needle special for positive pressure connector

Abstract

The invention discloses a blood taking needle special for a positive pressure connector, and relates to the technical field of blood taking needles. Comprising a blood sampling installation part, and a needle core auxiliary part is installed on the blood sampling installation part and used for preventing needle returning; an indwelling sealing piece is mounted on the blood sampling mounting piece; the indwelling sealing piece penetrates through the blood sampling mounting piece; the indwelling sealing piece is used for prompting pulses; a closed pressure supply piece is mounted on the indwelling closed piece; a switch control piece is mounted on the closed pressure supplying piece; the indwelling sealing part can be matched with the sealing pressure supplying part, so that the sealing plastic soft core can be conveniently controlled to move by hydraulic propulsion during pipe washing, and the indwelling soft needle can be sealed; the problems that according to an existing blood taking needle special for the positive pressure connector, pulse pressure supply cannot be automatically controlled conveniently, and meanwhile a needle head cannot be sealed conveniently are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of blood collection needles, and particularly to a blood collection needle dedicated to a positive pressure connector. Background Art

[0002] A blood collection needle is an important tool for clinical blood collection. For the situation of multiple blood collections, an indwelling blood collection needle is usually used. The needle core inside the indwelling needle can assist in puncturing into the blood vessel, and then the metal needle core can be removed. However, because the indwelling needle needs to be indwelled in the body for a long time, patients with coagulation dysfunction need to use it with caution. Even patients with normal coagulation function need to avoid blood reflux into the indwelling needle. At this time, a positive pressure connector is usually used in combination. However, the needle head of the current blood collection needle dedicated to the positive pressure connector is usually an open structure. When the patient changes body position or performs other activities, the indwelling part under the skin is not convenient for preventing backflow and sealing. At the same time, when the doctor performs the flushing operation, the syringe needs to be intermittently squeezed. When the flushing is almost completed, the syringe needs to be quickly removed while maintaining pressure, otherwise it is easy to affect the pressure relief of the positive pressure connector. The sealing operation is cumbersome and not convenient for automatically controlling pulsed pressure supply. At the same time, the traditional indwelling needle core is usually manually controlled to be withdrawn. After the first puncture fails, the doctor is prone to frequently adjust the needle core. Once the indwelling needle cannot follow the adjustment, it is easy to cause the needle core to pierce the indwelling needle.

[0003] Therefore, we propose a blood collection needle dedicated to a positive pressure connector. Summary of the Invention

[0004] The purpose of the present invention is to provide a blood collection needle dedicated to a positive pressure connector to solve the problems that the current blood collection needle dedicated to the positive pressure connector is not convenient for automatically controlling pulsed pressure supply and not convenient for sealing the needle head as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A blood collection needle dedicated to a positive pressure connector includes a blood collection mounting member, a needle core assisting member is mounted on the blood collection mounting member, and the needle core assisting member is used to prevent the needle from retracting; a retention sealing member is mounted on the blood collection mounting member; the retention sealing member passes through the blood collection mounting member; the retention sealing member is used to prompt the pulse; a sealing pressure supply member is mounted on the retention sealing member; a switch control member is mounted on the sealing pressure supply member; the switch control member is used to control pulsed liquid inlet; a positive pressure connecting member is mounted on the switch control member; the positive pressure connecting member is used to control the flow limit; the blood collection mounting member includes: a blood collection syringe and a ratchet groove, a row of ratchet grooves is opened on the blood collection syringe; the inner side of the blood collection syringe is a tapered hole structure.

[0006] Preferably, the blood collection mounting member further includes: a retention soft needle and a rubber stopper, the retention soft needle is fixedly mounted at the end of the blood collection syringe; the retention soft needle is used to indwell in the blood vessel; a rubber stopper is fixedly mounted inside the blood collection syringe, and the rubber stopper is an elastic structure.

[0007] Preferably, the needle core auxiliary member includes: a needle core cover and a one-way limiting piece. The side of the needle core cover is grooved; the needle core cover is slidably sleeved on the blood collection syringe; a row of one-way limiting pieces are fixedly installed inside the needle core cover, and the row of one-way limiting pieces are respectively attached to the ratchet grooves; the one-way limiting piece is used for moving unidirectionally on the ratchet groove.

[0008] Preferably, the needle core auxiliary member further includes: a blood collecting cylinder and a puncture needle core. The blood collecting cylinder is fixedly installed on the needle core cover; the blood collecting cylinder is fixedly installed at the tail of the needle core cover; the puncture needle core is fixedly installed on the blood collecting cylinder, and the puncture needle core pierces through the rubber stopper; the puncture needle core passes through the blood collection syringe, and the indwelling soft needle is sleeved on the puncture needle core; a handle is provided on the blood collecting cylinder; the blood collecting cylinder is of a transparent structure.

[0009] Preferably, the indwelling closure member includes: a closure installation tube, a stop ring and a plastic soft core. The closure installation tube is fixedly installed on the side of the blood collection syringe; a stop ring is fixedly installed inside the closure installation tube; the stop ring is of an arc-shaped structure; the closure installation tube is obliquely installed; a plastic soft core is sleeved inside the closure installation tube, and the plastic soft core is used for passing through the indwelling soft needle.

[0010] Preferably, the indwelling closure member further includes: a segmented rubber ball and an elastic rubber ring. A row of segmented rubber balls are fixedly installed on the plastic soft core; the diameter of the row of plastic soft cores is larger than the inner diameter of the stop ring; the segmented rubber ball is used for being sleeved inside the closure installation tube; an elastic rubber ring is fixedly installed on the closure installation tube, and the elastic rubber ring is sleeved on the plastic soft core; the elastic rubber ring is of an elastic structure.

[0011] Preferably, the closure pressure member includes: a closure cylinder, an anti-blocking net and an extension tube. The closure cylinder is fixedly sleeved on the closure installation tube; an anti-blocking net is fixedly installed inside the closure cylinder; the anti-blocking net is of an arc-shaped mesh structure; an extension tube is fixedly installed on the closure cylinder; the closure cylinder is located outside the segmented rubber ball.

[0012] Preferably, the switch control member includes: a switch connection tube, a spring retaining ring, an electrical contact ring and a sliding sleeve. The switch connection tube is fixedly installed at the end of the extension tube; the electrical contact ring is fixedly sleeved on the switch connection tube; the sliding sleeve is slidably installed on the switch connection tube; the spring retaining ring is fixedly sleeved on the switch connection tube.

[0013] Preferably, the switch control member further includes: a finger ring, a power connection elastic sheet, and an anti-misoperation spring. A finger ring is fixedly installed on the sliding sleeve; the finger ring is used for holding by hand; a ring of power connection elastic sheets is fixedly installed inside the sliding sleeve; the power connection elastic sheets are used for elastically fitting the power connection ring; an anti-misoperation spring is sleeved on the switch connecting pipe, and the end of the anti-misoperation spring is connected to the inside of the sliding sleeve; the other end of the anti-misoperation spring is connected to the spring retaining ring; the power connection elastic sheet is an elastically bent steel sheet; one side of the power connection elastic sheet close to the power connection ring is conductive, and an insulating coating is provided at one end of the power connection elastic sheet far from the power connection ring.

[0014] Preferably, the positive pressure connection member includes: a positive pressure joint cylinder, an electromagnet, and a stop plug. The positive pressure joint cylinder is fixedly installed on the switch connecting pipe; an electromagnet is fixedly sleeved inside the positive pressure joint cylinder; a thread is provided on the positive pressure joint cylinder; a conical hole is provided inside the positive pressure joint cylinder; a stop plug is sleeved inside the positive pressure joint cylinder, and the end of the stop plug is a conical structure, and the stop plug is attached to the inside of the positive pressure joint cylinder; a ring of through holes is provided on the stop plug; the electromagnet is used for magnetically attracting the stop plug; a spring is connected between the electromagnet and the stop plug, and the spring between the electromagnet and the stop plug is located inside the positive pressure joint cylinder; the electromagnet, the power connection elastic sheet, and the power connection ring are connected in series to a power source.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention adopts a needle core auxiliary member, which can be used to control the present structure when inserting and retaining a soft needle during a puncture and retention setting, prevent the puncture needle core from being repeatedly pulled and adjusted, ensure that the soft needle for retention is not damaged, and at the same time prevent the puncture needle core that has been withdrawn from being inserted again, which not only easily damages the puncture needle core but also easily causes blood vessel damage. The puncture safety is strong, especially for novices, and it can prevent their illegal operations.

[0017] By adopting a retention closure member, it can cooperate with a closure pressure application member, which is convenient for using hydraulic propulsion during flushing the pipeline of the present structure, controlling the movement of the closure plastic soft core, and can close the soft needle for retention, preventing the soft needle for retention from intruding into the blood due to external forces and other factors, resulting in problems such as blood clots. At the same time, the control of the present structure is simple, reducing the safety hazard of blood clots, and avoiding potential safety hazards caused by the soft needle for retention under the skin being not easy to observe.

[0018] Using a positive pressure connector can facilitate the pulse positive pressure flushing work for medical staff, enable automatic control of intermittent opening and closing of pressurization, and can be automatically closed each time pressurization is applied. This can facilitate the control of the pressurization amount, avoiding the situation where medical staff rely on pressing the piston handle of the syringe against the thenar muscle to apply pulsed pressure, that is, intermittent forceful propulsion, relying on the medical staff to feel the pressurization pressure, resulting in poor accuracy, cumbersome control, and being prone to causing the flushing liquid to be ejected for too long or too short a time, unable to meet the requirements of pulsed flushing. This structure can achieve automatic control, rapid opening and closing, improve the quality of pulsed flushing, reduce the operation difficulty. At the same time, using the positive pressure connector can make it more convenient for medical staff to automatically perform the catheter occlusion operation, with rapid catheter occlusion, without the need to, as in traditional manual catheter occlusion, manually draw out the syringe from the positive pressure connector while also pressing the piston of the syringe to apply pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic diagram of the overall structure of a blood collection needle dedicated to the positive pressure connector of the present invention;

[0020] Figure 2 FIG. is a cross-sectional view of the internal structure of a blood collection needle dedicated to the positive pressure connector of the present invention;

[0021] Figure 3 FIG. is a schematic diagram of the bottom structure of a blood collection needle dedicated to the positive pressure connector of the present invention;

[0022] Figure 4 FIG. is a schematic diagram of the blood collection installation member of the present invention;

[0023] Figure 5 FIG. is a schematic diagram of the needle core auxiliary member of the present invention;

[0024] Figure 6 For the present invention Figure 2 Enlarged view of the structure in region C in;

[0025] Figure 7 FIG. is a schematic diagram of the indwelling closure member of the present invention;

[0026] Figure 8 For the present invention Figure 2 Enlarged view of the structure in region D in;

[0027] Figure 9 FIG. is a schematic diagram of the switch control member of the present invention;

[0028] Figure 10 For the present invention Figure 2 Schematic diagram of the enlarged view of the structure in region E in;

[0029] Figure 11 FIG. is a schematic diagram of the position of the segmented rubber ball of the present invention.

[0030] In the figure: 1. Blood collection installation part; 101. Blood collection syringe; 1011. Spur groove; 102. Indwelling soft needle; 103. Rubber stopper; 2. Needle core auxiliary part; 201. Needle core cover; 202. One-way limit piece; 203. Blood accumulation cylinder; 204. Puncture needle core; 3. Indwelling sealing part; 301. Sealing installation tube; 302. Stop ring; 303. Plastic soft core; 304. Segmented rubber ball; 305. Elastic rubber ring; 4. Sealing pressure application part; 401. Sealing cylinder; 402. Anti-blocking net; 403. Extension tube; 5. Switch control part; 501. Switch connecting tube; 5011. Spring retaining ring; 502. Electric contact ring; 503. Sliding sleeve; 5031. Finger ring; 504. Electric contact elastic piece; 505. Anti-misoperation spring; 6. Positive pressure connecting part; 601. Positive pressure joint cylinder; 602. Electromagnet; 603. Stop plug. Detailed implementation mode

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1: Please refer to Figures 1 to 11 as shown:

[0033] The present invention provides a technical solution: A special blood collection needle for a positive pressure joint, including a blood collection installation part 1, a needle core auxiliary part 2 is installed on the blood collection installation part 1, and the needle core auxiliary part 2 is used to prevent backflow of the needle; a indwelling sealing part 3 is installed on the blood collection installation part 1; the indwelling sealing part 3 passes through the blood collection installation part 1; the indwelling sealing part 3 is used to prompt pulses; a sealing pressure application part 4 is installed on the indwelling sealing part 3; a switch control part 5 is installed on the sealing pressure application part 4; the switch control part 5 is used to control pulsed liquid inlet; a positive pressure connecting part 6 is installed on the switch control part 5; the positive pressure connecting part 6 is used to control current limiting; the blood collection installation part 1 includes: a blood collection syringe 101 and a spur groove 1011, and a row of spur grooves 1011 is opened on the blood collection syringe 101; the inner side of the blood collection syringe 101 is a tapered hole structure.

[0034] Among them, the blood collection installation member 1 further includes: a indwelling soft needle 102 and a rubber stopper 103. The indwelling soft needle 102 is fixedly installed at the end of the blood collection syringe 101; the indwelling soft needle 102 is used for indwelling in a blood vessel; a rubber stopper 103 is fixedly installed inside the blood collection syringe 101, and the rubber stopper 103 is of an elastic structure; the needle core auxiliary member 2 includes: a needle core cover 201 and a one-way limiting piece 202. The side of the needle core cover 201 is grooved; the needle core cover 201 is slidably sleeved on the blood collection syringe 101; a row of one-way limiting pieces 202 are fixedly installed inside the needle core cover 201, and a row of one-way limiting pieces 202 are respectively attached to the ratchet groove 1011; the one-way limiting piece 202 is used for moving unidirectionally on the ratchet groove 1011; the needle core auxiliary member 2 further includes: a blood accumulation cylinder 203 and a puncture needle core 204. The blood accumulation cylinder 203 is fixedly installed on the needle core cover 201; the blood accumulation cylinder 203 is fixedly installed at the tail of the needle core cover 201; the puncture needle core 204 is fixedly installed on the blood accumulation cylinder 203, and the puncture needle core 204 pierces through the rubber stopper 103; the puncture needle core 204 passes through the blood collection syringe 101, and the indwelling soft needle 102 is sleeved on the puncture needle core 204; a handle is provided on the blood accumulation cylinder 203; the blood accumulation cylinder 203 is of a transparent structure. When using the needle core auxiliary member 2 to control the indwelling soft needle 102 during the puncture and indwelling setting of this structure, it can prevent the puncture needle core 204 from being repeatedly pulled and adjusted, which can ensure that the indwelling soft needle 102 is not damaged. At the same time, when preventing the puncture needle core 204 that has been withdrawn from being inserted again, it is not only easy to damage the puncture needle core 204, but also easy to cause blood vessel damage. This structure is simple and reasonable in operation, ensuring puncture safety, especially for novices, and can prevent their illegal operations. By using the one-way limiting piece 202 for moving unidirectionally on the ratchet groove 1011, it can ensure that the puncture needle core 204 can only be withdrawn and cannot be inserted back.

[0035] Among them, the indwelling seal 3 includes: a sealed installation tube 301, a stop ring 302, and a plastic soft core 303. The sealed installation tube 301 is fixedly installed on the side of the blood collection syringe 101; a stop ring 302 is fixedly installed inside the sealed installation tube 301; the stop ring 302 is an arc-shaped structure; the sealed installation tube 301 is obliquely installed; a plastic soft core 303 is sleeved inside the sealed installation tube 301, and the plastic soft core 303 is used to pass through the indwelling soft needle 102; the indwelling seal 3 further includes: a segmented rubber ball 304 and an elastic rubber ring 305. A row of segmented rubber balls 304 is fixedly installed on the plastic soft core 303; the diameter of a row of plastic soft cores 303 is larger than the inner diameter of the stop ring 302; the segmented rubber ball 304 is used to be sleeved inside the sealed installation tube 301; an elastic rubber ring 305 is fixedly installed on the sealed installation tube 301, and the elastic rubber ring 305 is sleeved on the plastic soft core 303; the elastic rubber ring 305 is an elastic structure; the sealed pressure-applying member 4 includes: a sealed cylinder 401, an anti-blocking net 402, and an extension tube 403. The sealed cylinder 401 is fixedly sleeved on the sealed installation tube 301; an anti-blocking net 402 is fixedly installed inside the sealed cylinder 401; the anti-blocking net 402 is an arc-shaped mesh structure; an extension tube 403 is fixedly installed on the sealed cylinder 401; the sealed cylinder 401 is located outside the segmented rubber ball 304. The indwelling seal 3 can cooperate with the sealed pressure-applying member 4, which can facilitate the use of hydraulic propulsion during flushing of this structure, control the movement of the sealed plastic soft core 303, seal the indwelling soft needle 102, prevent the indwelling soft needle 102 from invading blood inside due to external forces and other factors, resulting in problems such as blood clots. At the same time, the control of this structure is simple, reducing the safety hazard of blood clots, avoiding the problem that the indwelling soft needle 102 under the skin is not easy to observe and difficult to detect potential hazards in a timely manner. This structure is compact, and the soft structure is also convenient for adapting to the indwelling soft needle 102. At the same time, this structure uses the segmented rubber ball 304 to facilitate elastic limit through the elastic rubber ring 305, improving the stability of the plastic soft core 303 while not affecting the flow of the liquid medicine. When drawing blood, the elastic elastic rubber ring 305 will not cause a closed stop to the segmented rubber ball 304, which is convenient for drawing blood. At the same time, after the extraction is completed and when flushing and sealing the tube, when pressure is applied at the extension tube 403, the pressure pushes the plastic soft core 303 forward, and the segmented rubber ball 304 will also move forward through the elastic elastic rubber ring 305. At this time, a row of segmented rubber balls 304 will be sleeved on the sealed installation tube 301 and move forward under the action of pressure, and the plastic soft core 303 will penetrate into the plastic soft core 303 for closed stop.

[0036] Embodiment 2, on the basis of Embodiment 1, the switch control member 5 includes: a switch connecting pipe 501, a spring retaining ring 5011, a current-carrying ring 502, and a sliding sleeve 503. The switch connecting pipe 501 is fixedly installed at the end of the extension pipe 403. A current-carrying ring 502 is fixedly sleeved on the switch connecting pipe 501. A sliding sleeve 503 is slidably installed on the switch connecting pipe 501. A spring retaining ring 5011 is fixedly sleeved on the switch connecting pipe 501. The switch control member 5 further includes: a finger ring 5031, a current-carrying elastic sheet 504, and an anti-misoperation spring 505. A finger ring 5031 is fixedly installed on the sliding sleeve 503. The finger ring 5031 is used for holding by hand. A circle of current-carrying elastic sheets 504 is fixedly installed inside the sliding sleeve 503. The current-carrying elastic sheets 504 are used for elastically fitting the current-carrying ring 502. An anti-misoperation spring 505 is sleeved on the switch connecting pipe 501, and the end of the anti-misoperation spring 505 is connected to the inside of the sliding sleeve 503. The other end of the anti-misoperation spring 505 is connected to the spring retaining ring 5011. The current-carrying elastic sheet 504 is an elastically bent steel sheet. As shown in the appendix Figure 9As shown, one side of the power connection elastic piece 504 close to the power connection ring 502 is conductive, and an insulating coating is provided at one end of the power connection elastic piece 504 away from the power connection ring 502; The positive pressure connecting piece 6 includes: a positive pressure joint cylinder 601, an electromagnet 602 and a stop plug 603. The positive pressure joint cylinder 601 is fixedly installed on the switch connecting pipe 501; An electromagnet 602 is fixedly sleeved inside the positive pressure joint cylinder 601; The positive pressure joint cylinder 601 is provided with threads; A tapered hole is provided inside the positive pressure joint cylinder 601; A stop plug 603 is sleeved inside the positive pressure joint cylinder 601, and the end of the stop plug 603 is of a tapered structure and the stop plug 603 is attached to the inside of the positive pressure joint cylinder 601; A circle of through holes is provided on the stop plug 603; The electromagnet 602 is used to magnetically attract the stop plug 603; A spring is connected between the electromagnet 602 and the stop plug 603, and the spring between the electromagnet 602 and the stop plug 603 is located inside the positive pressure joint cylinder 601;The electromagnet 602, the power - connecting elastic piece 504, and the power - connecting ring 502 are connected in series to a power source. The use of the positive - pressure connector 6 facilitates the medical staff to perform the pulsed positive - pressure tube flushing operation. It can achieve automatic control of intermittent opening and closing of pressurization, and each pressurization can be automatically closed, which is convenient for controlling the amount of pressurization. This avoids the medical staff relying on pressing the piston handle of the syringe against the thenar to perform pulsed pressurization, that is, intermittent force - adding propulsion, relying on the medical staff to feel the pressurization pressure, with poor accuracy, cumbersome control, and it is also easy to cause the flushing liquid to be ejected for too long or too short a time. It can ensure a large pulsed pressure and quickly close for the next pulsed pressurization, meeting the requirements of pulsed tube flushing. This structure can achieve automatic control, quick opening and closing, improve the quality of pulsed tube flushing, and reduce the operation difficulty. At the same time, using the positive - pressure connector 6 makes it more convenient for the medical staff to automatically perform the tube sealing operation, with quick tube sealing. Unlike traditional manual tube sealing, when manually removing the syringe from the positive - pressure connector while also pressing the piston of the syringe to apply pressure, otherwise it is easy to cause insufficient pressure or even pressure relief when the positive - pressure connector rebounds to apply positive pressure, affecting the quality of tube sealing. It improves the operation convenience and can achieve automatic control. The thenar abuts against the piston rod of the syringe, and the finger passes through the ring 5031. When the positive - pressure switch is pressurized by the movement of the syringe piston, the piston rod needs to be squeezed. At this time, the stop plug 603 is in a state of closing the positive - pressure connector barrel 601. As the thenar squeezes the piston rod, the sliding sleeve 503 will squeeze the anti - accidental - touch spring 505. At this time, the rear - moving sliding sleeve 503 drives the power - connecting elastic piece 504 to elastically fit the power - connecting ring 502 and then separate from the power - connecting ring 502. During this process, the electromagnet 602 is energized once, magnetically attracting the stop plug 603 to separate from the positive - pressure connector barrel 601. At this time, the piston rod is in a squeezed state, and the liquid in the syringe can be quickly pulsed with pressure once. Because when the power - connecting elastic piece 504 passes through the power - connecting ring 502 once, the electromagnet 602 will be de - energized. At this time, even if there is pressure in the syringe, the conical structure of the stop plug 603 will fit the positive - pressure connector barrel 601 to stop, preventing continuous pressurization. It is necessary to loosen the sliding sleeve 503, drive the power - connecting elastic piece 504 to reset, and then perform the next pulsed pressurization. The operation of the medical staff is simple and convenient. At the same time, in the above operation, after the pulsed pressurization is completed, the stop plug 603 will quickly be in a closed state, not affected by the positive - pressure connector. The medical staff does not need to remove the syringe from the positive - pressure connector while also pressing the piston of the syringe to apply pressure. At this time, under the extrusion of the spring between the stop plug 603 and the electromagnet 602, the stop plug 603 can fit the positive - pressure connector barrel 601, and the pressure in the extension tube 403 is not enough to push open the stop plug 603. Subsequently, the syringe can be normally removed, and the positive - pressure connector can also be normally reset and closed. The stop plug 603 prevents excessive blood - return pressure, causing the positive - pressure connector to fail to be closed in time.

[0037] Working principle of this embodiment: First, the doctor can hold the blood collection cylinder 203 together with the blood collection syringe 101, and insert the puncture needle core 204 and the indwelling soft needle 102 into the blood vessel at the same time. After inserting into the blood vessel, blood will flow into the blood collection cylinder 203. At this time, the indwelling soft needle 102 has punctured into the blood vessel, and the needle core cover 201 can be pulled to extract the puncture needle core 204. At this time, using the elasticity of the rubber stopper 103, it can maintain a seal when the puncture needle core 204 is extracted. At the same time, the one-way limiting piece 202 is used to move unidirectionally on the ratchet groove 1011, which can ensure that the puncture needle core 204 can only be extracted and cannot be inserted back. Connect the positive pressure connector cylinder 601 to the existing positive pressure connector, and a syringe is inserted into the positive pressure connector for flushing the tube. The thenar of the medical staff abuts against the piston rod of the syringe, and the finger passes through the finger ring 5031. When the positive pressure switch is pressed by the movement of the syringe piston, the piston rod needs to be squeezed. At this time, the stop plug 603 is in a state of closing the positive pressure connector cylinder 601. As the thenar squeezes the piston rod, the sliding sleeve 503 will squeeze the anti-misoperation spring 505. At this time, the sliding sleeve 503 moves backward and drives the power-on elastic sheet 504 to elastically fit the power-on ring 502 and then separates from the power-on ring 502. During this process, the electromagnet 602 will be powered on once, and the magnetic attraction causes the stop plug 603 to separate from the positive pressure connector cylinder 601. At this time, the piston rod is in a squeezed state, and the liquid medicine in the syringe can be quickly pulsed for pressure once. At this time, the pulsed pressure is large and can be quickly closed because when the power-on elastic sheet 504 passes through the power-on ring 502 once, the electromagnet 602 will be powered off. Even if there is pressure in the syringe at this time, the conical structure of the stop plug 603 will fit the positive pressure connector cylinder 601 to stop, preventing continuous pressure application. It is necessary to loosen the sliding sleeve 503, drive the power-on elastic sheet 504 to reset, and then perform the next pulsed pressure application. The positive pressure connector also has a blood sampling port, and a syringe can be connected to draw blood. When drawing blood, the conical structure of the stop plug 603 will not cause a stop, and under negative pressure, the extension tube 403 can achieve back suction; when flushing and sealing the tube, when pressure is applied at the extension tube 403, the pressure pushes the plastic soft core 303 forward, and the segmented rubber balls 304 will also move forward through the elastic rubber ring 305. At this time, a row of segmented rubber balls 304 will be sleeved on the closed installation tube 301 and move forward under pressure, and the plastic soft core 303 will penetrate into the plastic soft core 303 for closed stop, keeping the inside of the plastic soft core 303 clean and improving its service life. At the same time, when drawing blood again later, under negative pressure, the segmented rubber balls 304 can move back again without affecting blood drawing.

[0038] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blood collection needle dedicated to a positive pressure connector, comprising a blood collection mounting member (1), and a needle core auxiliary member (2) is mounted on the blood collection mounting member (1), characterized in that: The needle core auxiliary part (2) is used to prevent back needle; A retention closure (3) is installed on the blood collection installation part (1); The retention closure (3) passes through the blood collection installation part (1); The retention closure (3) is used to prompt pulses. A closure pressure application part (4) is installed on the retention closure (3); A switch control part (5) is installed on the closure pressure application part (4); The switch control part (5) is used to control pulsed liquid inlet. A positive pressure connection part (6) is installed on the switch control part (5); The positive pressure connection part (6) is used to control current limiting. The blood collection installation part (1) includes: a blood collection syringe (101) and a ratchet groove (1011). A row of ratchet grooves (1011) is formed on the blood collection syringe (101); The inner side of the blood collection syringe (101) is a tapered hole structure.

2. The special blood collection needle for a positive pressure connector according to claim 1, wherein: The blood collection installation part (1) further includes: a retention soft needle (102) and a rubber stopper (103). The retention soft needle (102) is fixedly installed at the end of the blood collection syringe (101); The retention soft needle (102) is used to retain in a blood vessel; A rubber stopper (103) is fixedly installed inside the blood collection syringe (101), and the rubber stopper (103) is an elastic structure.

3. The special blood collection needle with a positive pressure connector according to claim 2, characterized in that: The needle core auxiliary part (2) includes: a needle core cover (201) and a one-way limiting piece (202). The side of the needle core cover (201) is grooved; The needle core cover (201) is slidably sleeved on the blood collection syringe (101); A row of one-way limiting pieces (202) is fixedly installed inside the needle core cover (201), and the row of one-way limiting pieces (202) are respectively fitted in the ratchet grooves (1011); The one-way limiting piece (202) is used to move unidirectionally on the ratchet groove (1011).

4. The dedicated blood collection needle with a positive pressure connector according to claim 3, characterized in that: The needle core auxiliary part (2) further includes: a blood accumulation cylinder (203) and a puncture needle core (204). A blood accumulation cylinder (203) is fixedly installed on the needle core cover (201); The blood accumulation cylinder (203) is fixedly installed at the tail of the needle core cover (201); A puncture needle core (204) is fixedly installed on the blood accumulation cylinder (203), and the puncture needle core (204) pierces through the rubber stopper (103); The puncture needle core (204) passes through the blood collection syringe (101), and the retention soft needle (102) is sleeved on the puncture needle core (204); A handle is provided on the blood accumulation cylinder (203); The blood accumulation cylinder (203) is a transparent structure.

5. The special blood collection needle for positive pressure connector according to claim 2, characterized in that: The retention closure (3) includes: a closure installation tube (301), a stop ring (302) and a plastic soft core (303). The closure installation tube (301) is fixedly installed on the side of the blood collection syringe (101); A stop ring (302) is fixedly installed inside the closure installation tube (301); The stop ring (302) is an arc-shaped structure; The closure installation tube (301) is obliquely installed; A plastic soft core (303) is sleeved inside the closure installation tube (301), and the plastic soft core (303) is used to pass through the retention soft needle (102).

6. The dedicated blood collection needle with a positive pressure connector according to claim 5, characterized in that: The indwelling closure member (3) further includes: a segmented rubber ball (304) and an elastic rubber ring (305). A row of segmented rubber balls (304) is fixedly installed on the plastic soft core (303); the diameter of a row of the plastic soft cores (303) is greater than the inner diameter of the retaining ring (302); the segmented rubber balls (304) are used for being sleeved in the closed installation tube (301); an elastic rubber ring (305) is fixedly installed on the closed installation tube (301), and the elastic rubber ring (305) is sleeved on the plastic soft core (303); the elastic rubber ring (305) is of an elastic structure.

7. The special blood collection needle for a positive pressure connector according to claim 6, wherein: The closing pressure-applying member (4) includes: a closing cylinder (401), an anti-blocking net (402), and an extension tube (403). The closing cylinder (401) is fixedly sleeved on the closed installation tube (301); the anti-blocking net (402) is fixedly installed inside the closing cylinder (401); the anti-blocking net (402) is of an arc-shaped mesh structure; the extension tube (403) is fixedly installed on the closing cylinder (401); the closing cylinder (401) is located outside the segmented rubber ball (304).

8. The special blood collection needle for positive pressure connector according to claim 7, characterized in that: The switch control member (5) includes: a switch connecting tube (501), a spring retaining ring (5011), a current-carrying ring (502), and a sliding sleeve (503). The switch connecting tube (501) is fixedly installed at the end of the extension tube (403); the current-carrying ring (502) is fixedly sleeved on the switch connecting tube (501); the sliding sleeve (503) is slidably installed on the switch connecting tube (501); the spring retaining ring (5011) is fixedly sleeved on the switch connecting tube (501).

9. The dedicated blood collection needle for positive pressure connector according to claim 8, wherein: The switch control member (5) further includes: a finger ring (5031), a current-carrying elastic piece (504), and an anti-misoperation spring (505). The finger ring (5031) is fixedly installed on the sliding sleeve (503); the finger ring (5031) is for holding by hand; a circle of current-carrying elastic pieces (504) is fixedly installed inside the sliding sleeve (503); the current-carrying elastic pieces (504) are used for elastically fitting the current-carrying ring (502); the anti-misoperation spring (505) is sleeved on the switch connecting tube (501), and the end of the anti-misoperation spring (505) is connected to the inside of the sliding sleeve (503); the other end of the anti-misoperation spring (505) is connected to the spring retaining ring (5011); the current-carrying elastic pieces (504) are elastic bent steel sheets; the side of the current-carrying elastic pieces (504) close to the current-carrying ring (502) is conductive.

10. The special blood collection needle for positive pressure connector according to claim 9, characterized in that: The positive pressure connector (6) includes: a positive pressure joint cylinder (601), an electromagnet (602), and a stop plug (603). The positive pressure joint cylinder (601) is fixedly installed on the switch connecting pipe (501); the electromagnet (602) is fixedly sleeved inside the positive pressure joint cylinder (601); the positive pressure joint cylinder (601) is provided with threads; a tapered hole is provided inside the positive pressure joint cylinder (601); a stop plug (603) is sleeved inside the positive pressure joint cylinder (601), and the end of the stop plug (603) is of a tapered structure and the stop plug (603) is attached to the inner side of the positive pressure joint cylinder (601); a circle of through holes is provided on the stop plug (603); the electromagnet (602) is used to magnetically attract the stop plug (603); a spring is connected between the electromagnet (602) and the stop plug (603), and the spring between the electromagnet (602) and the stop plug (603) is located inside the positive pressure joint cylinder (601); the electromagnet (602), the power connection elastic piece (504), and the power connection ring (502) are connected in series to a power source.

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