Remaining needle protective cap

Abstract

The utility model discloses an indwelling needle protective cap which comprises a first cap body connected with the end of a side pipe of an indwelling needle, a liquid control mechanism arranged in the first cap body, a second cap body connected with the end of a positive pressure valve of the indwelling needle and a connecting piece. The liquid control mechanism comprises a liquid guide mechanism arranged in the first cavity and an inner core arranged in the second cavity, the liquid guide mechanism comprises a liquid guide rod which is internally provided with a liquid guide cavity and can reciprocate in the first cavity, and the liquid guide rod comprises a limiting block which is arranged at the end part and can enter / exit from the second cavity; the inner core can reciprocate in the second cavity and is provided with a liquid guide groove; after the limiting block is clamped into the liquid guide groove, the liquid guide cavity, the liquid guide groove and the end of the side pipe can form a liquid guide channel, after the limiting block is separated from the liquid guide groove, the liquid guide channel is disconnected and has the capability of preventing bacteria from entering, the liquid guide rod is always connected with a protective cover and is not separated from the liquid guide rod, and the bacteria are prevented from entering doubly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a remaining needle protection cap. BACKGROUND

[0002] The intravenous remaining needle can reduce the frequency of blood vessel puncture and alleviate the pain of patients, and has been widely used in clinical treatment. The intravenous remaining needle comprises a positive pressure connector, the positive pressure connector is composed of a positive pressure valve end head and a side pipe end head arranged on one side of the positive pressure connector, and the side pipe end head is usually screwed with a protection cap for closing the side pipe port. When it is necessary to rescue a critical patient or to perform double intravenous channel infusion, the protection cap screwed on the side pipe end head is unscrewed. After the protection cap is separated from the side pipe, the protection cap is small in size and is prone to be dropped or lost. If the dropped protection cap is used continuously or is lost and no matching protection cap is used to protect the port, the probability of infection caused by bacteria entering the vein from the port is increased. CONTENT

[0003] In view of the technical problem that the protection cap is screwed with the side pipe of the intravenous remaining needle, the protection cap needs to be unscrewed when liquid is delivered into the side pipe, and after the protection cap is completely separated from the side pipe, the protection cap is prone to be dropped or lost, thereby increasing the probability of infection caused by bacteria entering the vein, the utility model provides a remaining needle protection cap.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] A remaining needle protection cap, which comprises a first cap body detachably connected with a side pipe end head of a remaining needle, a liquid control mechanism arranged in the first cap body, a second cap body detachably connected with a positive pressure valve end head of the remaining needle, and a connecting piece detachably connected between the first cap body and the second cap body, wherein an outer wall of the first cap body is provided with a cap separating part with a hollow first cavity inside, a second cavity inside the first cap body is in communication with the first cavity, the liquid control mechanism comprises a liquid guide mechanism arranged in the first cavity and an inner core arranged in the second cavity, the liquid guide mechanism comprises a liquid guide rod with a liquid guide cavity inside and capable of reciprocating in the first cavity, the liquid guide rod comprises a limiting block arranged at an end portion and capable of entering and exiting the second cavity, the other end of the liquid guide rod is located outside the cap separating part, and an outer end of the liquid guide rod is connected with a protection cover detachably connected with the outer end of the liquid guide rod through an elastic piece; the inner core is capable of reciprocating in the second cavity, and the inner core is provided with a liquid guide groove; after the limiting block is clamped into the liquid guide groove, the liquid guide cavity, the liquid guide groove and the side pipe end head can form a liquid guide channel, and the liquid guide channel is disconnected after the limiting block is separated from the liquid guide groove.

[0006] The second cap has a hollow third cavity, disinfectant is stored in the middle space of the third cavity, the lower space of the third cavity is connected with the end of the positive pressure valve, and a liquid control assembly for controlling the flow of disinfectant from the middle space to the lower space is arranged in the third cavity.

[0007] Further, the liquid guide rod further comprises a liquid guide main rod fixedly connected to one end of the limiting block, a connecting part fixedly connected to the other end of the liquid guide main rod and located outside the first cavity, and a first spring sleeved on the liquid guide main rod and distributed in the first cavity, the liquid guide cavity extends from the outer end face of the connecting part to the inner end face of the limiting block, the outer end of the connecting part is provided with an embedding groove, and a connecting ring is arranged in the embedding groove, the connecting ring can rotate around the connecting part, at least two elastic members are fixedly connected to the outer wall of the connecting ring, one of the elastic members is fixedly connected to the protective cover, the protective cover is screwed with the connecting part, and the other elastic member is fixedly connected with a reinforced silica gel ring.

[0008] Further, the inner core comprises a holding part arranged outside the second cavity, a core rod arranged at the lower end of the holding part, a first core block and a second core block fixedly connected to the outer periphery of the core rod and having an outer diameter larger than that of the core rod and being arranged at intervals, and a second spring distributed on the upper end of the first core block and sleeved on the core rod, the part of the core rod between the first core block and the second core block is defined as a liquid guide section, the bottom surface of the first core block, the outer wall of the liquid guide section and the top surface of the second core block can be combined to form a U-shaped ring groove, the U-shaped ring groove is defined as the liquid guide groove, a liquid guide channel is arranged from the bottom surface of the second core block to the outer wall of the liquid guide section, one end of the liquid guide channel can communicate with the liquid guide cavity, and the other opposite end can communicate with the inner part of the side pipe end.

[0009] Further, the first core block and the second core block are each provided with a liquid blocking sealing ring, when the first core block moves towards the direction close to the holding part, the second spring can be compressed, and the limiting block can be clamped into the liquid guide groove; when the limiting block moves towards the outside of the first cavity, the second spring returns, and the limiting block can abut against the outer wall of the first core block; the abutment positions of the limiting block and the first core block and the liquid guide groove are distributed between the two liquid blocking sealing rings.

[0010] Further, the third cavity is internally provided with a first partition plate and a second partition plate arranged at intervals for dividing the internal space of the third cavity into three parts to form an upper space, a middle space and a lower space arranged in sequence from top to bottom, an inner wall of the lower space is provided with an annular silica gel sealing ring, an inner diameter of the annular silica gel sealing ring is smaller than an outer diameter of the end head of the positive pressure valve, and the inner wall of the lower space is further provided with an internal thread located below the annular silica gel sealing ring and screwed with the end head of the positive pressure valve.

[0011] Further, a top end of the annular silica gel sealing ring is fixedly connected with a silica gel duckbill valve, a port of the silica gel duckbill valve faces the second partition plate, and the silica gel duckbill valve is used to prevent liquid existing between the second partition plate and the annular silica gel sealing ring from flowing below the annular silica gel sealing ring.

[0012] Further, the inner wall of the lower space is further provided with a cotton pad distributed below the silica gel duckbill valve.

[0013] Further, the liquid control assembly comprises a handle arranged outside the upper space, a first rod arranged at a bottom end of the handle and capable of extending into the upper space, a third spring sleeved on the first rod and distributed in the upper space, a through hole vertically penetrating through the first partition plate, a liquid outlet hole vertically penetrating through the second partition plate, a second rod arranged at a bottom end of the first rod and capable of penetrating through the through hole, and a sealing block arranged at a bottom end of the second rod and capable of abutting against a top end of the liquid outlet hole to seal the liquid outlet hole, an outer diameter of the first rod is greater than an outer diameter of the second rod, and the outer diameter of the first rod is also greater than an inner diameter of the through hole; when the sealing block moves away from the liquid outlet hole to discharge liquid in the middle space to the lower space, the third spring can drive the sealing block to return.

[0014] Further, a sealing silica gel layer is arranged on a bottom surface of the first rod and a bottom surface of the sealing block, respectively, and the sealing silica gel layer can abut against the first partition plate and the second partition plate, respectively; an outer diameter of an annular silica gel block fixedly connected with an outer wall of the second rod is greater than the inner diameter of the through hole, and when the sealing block moves away from the liquid outlet hole, the annular silica gel block can abut against a bottom end surface of the first partition plate to cover the through hole.

[0015] Further, the connecting piece is made of a material with elasticity, and both ends of the connecting piece are provided with a supporting lug for screwing with the first cap body and the second cap body, respectively.

[0016] In conclusion, the utility model has the advantages of: 1, the first cap body and the side pipe end head are screwed, liquid can be transported into the side pipe end head from the connecting part position, the first cap body is installed, and the realization of the double venous channel is not interfered. The control of liquid on-off can be realized by controlling the liquid control mechanism in the first cap body, the liquid passage is blocked after the limiting block and the liquid guide groove are separated, even if the protective cover is not connected with the connecting part, the effect of avoiding infection by blocking bacteria from entering the vein is achieved. After the component of the infusion apparatus for transporting liquid is removed, the protective cover connected by the elastic member can be connected with the connecting part at any time, and the protective cover cannot be lost or fallen off, the bacteria are further blocked after the protective cover is screwed with the connecting part. The liquid passage is controlled to be on-off, and the protective cover is connected, the ability of the first cap body to prevent bacteria from entering the inside is enhanced under the double effects. 2, the second cap body can also be used for protecting the positive pressure valve end head, when the use surface of the positive pressure valve end head is arranged in the lower space, the handle is controlled outside the second cap body, the sealing block is separated from the liquid outlet hole, the disinfectant is injected into the lower space, the disinfectant contacts the cotton pad to disinfect the use surface, and the antibacterial ability of the positive pressure valve end head is improved. More disinfectant can be stored in the middle space, and the positive pressure valve end head is conveniently disinfected at any time in the process of long-time protection. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure diagram of the positive pressure connector of the intravenous indwelling needle provided by the utility model.

[0018] Figure 2 is the structure diagram of the protective cap of the indwelling needle provided by the utility model.

[0019] Figure 3 is Figure 2 the internal structure diagram.

[0020] In the figure, 100 - positive pressure connector, 110 - positive pressure valve end, 120 - side tube end, 200 - first cap body, 210 - cap part, 211 - first cavity, 220 - second cavity, 300 - second cap body, 310 - liquid injection tube, 311 - end cover, 320 - first partition, 330 - second partition, 340 - upper space, 350 - middle space, 360 - lower space, 361 - annular silica gel sealing ring, 3610 - silica gel duckbill valve, 370 - cotton pad, 400 - liquid guide rod, 410 - limiting block, 420 - liquid guide main rod, 430 - connecting part, 431 - connecting ring, 4310 - elastic member, 431A - protective cover, 431B - reinforced silica gel ring, 440 - first spring, 500 - inner core, 510 - holding part, 520 - core rod, 530 - first core block, 540 - second core block, 550 - second spring, 560 - liquid guide groove, 561 - liquid guide channel, 570 - liquid blocking sealing ring, 600 - liquid control assembly, 610 - handle, 620 - first rod body, 630 - third spring, 640 - second rod body, 641 - annular silica gel block, 650 - sealing block, 660 - liquid outlet hole, 700 - connecting piece. DETAILED DESCRIPTION

[0021] The utility model is further described below in combination with specific drawings.

[0022] Please refer to Figure 1 The intravenous indwelling needle comprises a positive pressure connector 100 which is composed of a positive pressure valve end 110 and a side tube end 120 arranged on one side of the positive pressure connector 100.

[0023] The utility model provides a kind of indwelling needle protective cap, please refer to Figure 2 Including the first cap body 200 detachably connected with the side tube end 120 of indwelling needle, the liquid control mechanism arranged in the first cap body 200, the second cap body 300 detachably connected with the positive pressure valve end 110 of indwelling needle and the connecting piece 700 detachably connected between the first cap body 200 and the second cap body 300.The outer wall of the first cap body 200 has a cap part 210 with a hollow first cavity 211, and the second cavity 220 in the first cap body 200 is communicated with the first cavity 211.Please refer to Figure 3The liquid control mechanism includes a liquid guide mechanism arranged in the first cavity 211 and an inner core 500 arranged in the second cavity 220. The liquid guide mechanism includes a liquid guide rod 400 having a liquid guide cavity inside and capable of reciprocating in the first cavity 211, the liquid guide rod 400 including a limiting block 410 arranged at an end and capable of entering / leaving the second cavity 220, the other end of the liquid guide rod 400 being located outside the cap portion 210, and the outer end of the liquid guide rod 400 being connected with a protective cover 431A detachably connected with the outer end of the liquid guide rod 400 through an elastic member 4310. The inner core 500 is capable of reciprocating in the second cavity 220, and the inner core 500 has a liquid guide groove 560. When the limiting block 410 is clamped into the liquid guide groove 560, the liquid guide cavity, the liquid guide groove 560 and the side tube end 120 can form a liquid guide passage, and when the limiting block 410 is separated from the liquid guide groove 560, the liquid guide passage is disconnected. The second cap body 300 has a hollow third cavity inside, the middle space 350 of the third cavity stores disinfectant, the lower space 360 of the third cavity is connected with the positive pressure valve end 110, and the third cavity further has a liquid control assembly 600 for controlling the flow of disinfectant from the middle space 350 to the lower space 360. The outer wall of the second cap body 300 is provided with a liquid injection pipe 310 communicating with the third cavity for injecting disinfectant into the middle space 350, and the liquid injection pipe 310 is screwed with an end cover 311 for controlling the opening or closing of the liquid injection pipe 310, facilitating the injection of disinfectant into the middle space 350.

[0024] With the above structure, before using the intravenous indwelling needle, the traditional protective cap of the side tube end 120 is removed, the first cap body 200 is assembled at the position of the side tube end 120, the infusion device can be connected with the liquid guide rod 400, liquid is injected into the liquid guide passage, and when the limiting block 410 is clamped into the liquid guide groove 560, the liquid flows into the side tube end 120. When the limiting block 410 is separated from the liquid guide groove 560, the liquid flow is blocked and the internal liquid is no longer delivered. After the liquid passage is blocked, the ability to prevent bacteria from entering is achieved, and the liquid guide rod 400 is always connected with a protective cover 431A through an elastic member 4310, and cannot be completely separated from the liquid guide rod 400, preventing the protective cover 431A from being lost or falling off. Therefore, when the side tube end 120 is working without being used, the protective cover 431A is connected to the liquid guide rod 400, further improving the antibacterial and antifouling ability, and reducing the probability of bacteria entering the vein from the port and causing infection. The positive pressure valve end 110 of the indwelling needle is protected by assembling the second cap body 300, and after the positive pressure valve end 110 is arranged in the third cavity, disinfectant flows to the positive pressure valve end 110 and contacts the positive pressure valve end 110 for disinfection, and the disinfectant is preferably alcohol. Such a positive pressure valve end 110 is no longer exposed to the air for a long time during the indwelling process, preventing bacteria from entering the vein from the end and causing infection.

[0025] The liquid guide rod 400 further comprises a liquid guide main rod 420 fixedly connected with the limiting block 410, a connecting part 430 fixedly connected with the other end of the liquid guide main rod 420 and located outside the first cavity 211, and a first spring 440 sleeved on the liquid guide main rod 420 and distributed in the first cavity 211. The liquid guide cavity extends from the outer end face of the connecting part 430 to the inner end face of the limiting block 410. When the double-vein infusion channel needs to be opened, the infusion device can be connected with the connecting part 430. The outer end of the connecting part 430 is provided with an embedded groove, and a connecting ring 431 is arranged in the embedded groove. The connecting ring 431 can rotate around the connecting part 430, and at least two elastic members 4310 are fixedly connected with the outer wall of the connecting ring 431. One of the elastic members 4310 is fixedly connected with a protective cover 431A, and the protective cover 431A is screwed with the connecting part 430. The other elastic member 4310 is fixedly connected with a reinforced silica gel ring 431B. When the infusion device is connected at the position of the connecting part 430, the reinforced silica gel ring 431B is used to tightly clamp the infusion device, so that the connected part of the connecting part 430 is more firmly fixed to prevent falling off. After the internal liquid flow is blocked, the connected part of the connecting part 430 is removed, and the screwed protective cover 431A and the connecting part 430 can be quickly and conveniently assembled together, thereby achieving the second prevention of bacteria entering the vein.

[0026] The inner core 500 comprises a holding part 510 arranged outside the second cavity 220, a core rod 520 arranged at the lower end of the holding part 510, a first core block 530 and a second core block 540 fixedly connected with the outer periphery of the core rod 520 and having an outer diameter larger than that of the core rod 520 and being arranged in a spaced manner, and a second spring 550 distributed on the upper end of the first core block 530 and sleeved on the core rod 520. The part of the core rod 520 located between the first core block 530 and the second core block 540 is defined as a liquid guide section. The bottom surface of the first core block 530, the outer wall of the liquid guide section, and the top surface of the second core block 540 can jointly form a U-shaped ring groove, which is defined as the liquid guide groove 560. A liquid guide channel 561 is arranged from the bottom surface of the second core block 540 to the outer wall of the liquid guide section. One end of the liquid guide channel 561 can communicate with the liquid guide cavity, and the other opposite end can communicate with the inside of the side pipe end head 120. Since the inner core 500 can move in the second cavity 220, the position of the liquid guide channel 561 can be changed in the second cavity 220. When the limiting block 410 is clamped in the liquid guide groove 560, the liquid guide passage contacts and aligns with the liquid guide channel 561 to form a through injection and infusion passage. When the limiting block 410 is separated from the liquid guide groove 560, the liquid guide channel 561 and the liquid guide passage are misaligned, thereby achieving the purpose of blocking the liquid flow. The liquid guide channel 561 and the liquid guide passage at the open position can also achieve the first prevention of bacteria entering.

[0027] The first core block 530 and the second core block 540 are each provided with a liquid blocking sealing ring 570, which can compress the second spring 550 when the first core block 530 moves towards the direction close to the holding part 510, and the limiting block 410 is clamped into the liquid guide groove 560. When the limiting block 410 moves towards the outside of the first cavity 211, the second spring 550 resets, and the limiting block 410 can abut against the outer wall of the first core block 530, and the abutting position of the limiting block 410 and the first core block 530 and the liquid guide groove 560 are distributed between the two liquid blocking sealing rings 570. When the liquid control mechanism controls the liquid on-off in the first cap body 200, hold the holding part 510, and control the first core block 530 to move towards the direction close to the holding part 510, the first core block 530 moves upwards, the limiting block 410 is clamped into the liquid guide groove 560, and at this time the first spring 440 is in an uncompressed state and is fully expanded, while the second spring 550 is in a compressed state. When it is needed to separate the limiting block 410 from the liquid guide groove 560, hold the connecting part 430, and control the limiting block 410 to move towards the outside of the first cavity 211, at this time the first spring 440 is compressed, while the second spring 550 is fully expanded to drive the first core block 530 to reset, and after the holding of the connecting part 430 is released, the first spring 440 resets, so that the limiting block 410 abuts against the outer wall of the first core block 530. Moreover, due to the limitation of the liquid blocking sealing ring 570, when the liquid guide passage and the liquid guide channel 561 are connected, the liquid leakage can be avoided.

[0028] The third cavity is provided with a first partition plate 320 and a second partition plate 330 arranged at intervals to divide the internal space of the third cavity into three parts to form an upper space 340, a middle space 350 and a lower space 360 distributed in sequence from top to bottom, the inner wall of the lower space 360 is provided with an annular silica gel sealing ring 361, the inner diameter of the annular silica gel sealing ring 361 is smaller than the outer diameter of the positive pressure valve end 110, and the inner wall of the lower space 360 is further provided with an internal thread below the annular silica gel sealing ring 361, which is screwed with the positive pressure valve end 110. The top end surface of the positive pressure valve end 110 is a use surface, when the positive pressure valve end 110 is screwed in the lower space 360, the use surface is accommodated in the space between the second partition plate 330 and the annular silica gel sealing ring 361, so when the liquid control assembly 600 injects disinfectant into the lower space 360, the purpose of disinfecting the use surface can be achieved, and the risk of bacteria, dust and the like entering the vein from the end use surface position to cause infection can be prevented.

[0029] The top end of the annular silica gel sealing ring 361 is fixed with a silica gel duckbill valve 3610, the port of the silica gel duckbill valve 3610 faces the second partition plate 330, the silica gel duckbill valve 3610 is used to prevent the liquid between the second partition plate 330 and the annular silica gel sealing ring 361 from flowing to the lower space 360 below the annular silica gel sealing ring 361, the inner wall of the lower space 360 is further provided with a cotton pad 370 distributed below the silica gel duckbill valve 3610. The disinfectant entering the lower space 360 contacts and soaks the cotton pad 370, the positive pressure valve end head 110 extends into the lower space 360, and after passing through the port of the silica gel duckbill valve 3610, abuts against the cotton pad 370, and the cotton pad 370 directly contacts and disinfects the use surface. The second cap body 300 protects the positive pressure valve end head 110, not only can play a role in preventing bacteria and dust, but also can disinfect the use surface of the positive pressure valve end head 110. After the positive pressure valve end head 110 is separated from the first cap body 200, the silica gel duckbill valve 3610 returns to the original state, and if too much liquid remains in the lower space 360, the silica gel duckbill valve 3610 is a one-way valve and has the effect of preventing the liquid from flowing out.

[0030] The liquid control assembly 600 comprises a handle 610 arranged outside the upper space 340, a first rod body 620 connected with the bottom end of the handle 610 and capable of extending into the upper space 340, a third spring 630 sleeved on the first rod body 620 and distributed in the upper space 340, a through hole vertically penetrating the first partition plate 320, a liquid outlet hole 660 vertically penetrating the second partition plate 330, a second rod body 640 arranged at the bottom end of the first rod body 620 and capable of penetrating the through hole, and a sealing block 650 arranged at the bottom end of the second rod body 640 and capable of abutting against the top end of the liquid outlet hole 660 to seal the liquid outlet hole 660. The outer diameter of the first rod body 620 is greater than the outer diameter of the second rod body 640, and the outer diameter of the first rod body 620 is also greater than the inner diameter of the through hole. When the sealing block 650 moves away from the liquid outlet hole 660 to discharge the liquid in the middle space 350 into the lower space 360, the third spring 630 drives the sealing block 650 to return. Holding the handle 610 outside the second cap body 300 and moving the handle 610 away from the second cap body 300, at this time, the sealing block 650 moves away from the third cavity, the third spring 630 is in a compressed state, and after the sealing block 650 separates from the liquid outlet hole 660, the disinfectant in the middle space 350 is smoothly discharged into the lower space 360, soaks the cotton pad 370, and disinfects the use surface of the positive pressure valve end head 110.

[0031] The bottom surface of the first rod body 620 and the bottom surface of the sealing block 650 are provided with a sealing silica gel layer (not shown in the figure), which can abut against the first partition plate 320 and the second partition plate 330 respectively. The outer wall of the second rod body 640 is fixedly connected with an annular silica gel block 641 with an outer diameter greater than the inner diameter of the through hole. When the sealing block 650 moves away from the liquid outlet hole 660, the annular silica gel block 641 can abut against the bottom end surface of the first partition plate 320 to cover the through hole. The sealing silica gel layer and the annular silica gel block 641 both serve to improve the air tightness of the third cavity and prevent liquid leakage.

[0032] The connecting piece 700 is made of a material with elasticity, preferably an elastic band or a silica gel band. The two ends of the connecting piece 700 are each provided with a supporting lug (not shown in the figure), which is screwed with the corresponding first cap body 200 and second cap body 300. The first cap body 200 can be used together to protect the two ports on the positive pressure connector 100, or the first cap body 200 or the second cap body 300 can be used alone according to the actual use environment.

[0033] The protective cap: 1. After the first cap body 200 is screwed with the side tube end 120, liquid can be delivered into the side tube end 120 from the position of the connecting part 430. After the first cap body 200 is installed, it does not interfere with the realization of the double-vein channel. By controlling the liquid control mechanism in the first cap body 200, the control of the liquid passage can be realized. After the limiting block 410 is separated from the liquid guide groove 560, the liquid passage is blocked. Even if the protective cover 431A is not connected with the connecting part 430, it also has the effect of preventing bacteria from entering the vein to avoid infection. After the components of the infusion device for delivering liquid are removed, the protective cover 431A connected by the elastic member 4310 can be connected with the connecting part 430 at all times and will not be lost or fall off. When the protective cover 431A is screwed with the connecting part 430, it further blocks the entry of bacteria. By controlling the opening and closing of the liquid passage and connecting the protective cover 431A, the ability of the first cap body 200 to prevent bacteria from entering the interior is enhanced under the double action. The structure is simple, without complex structure, low cost and practical. 2. The second cap body 300 can also be used to protect the positive pressure valve end 110. When the use surface of the positive pressure valve end 110 is placed in the lower space 360, the handle 610 is controlled outside the second cap body 300 to separate the sealing block 650 from the liquid outlet hole 660, and disinfectant is injected into the lower space 360 to contact the cotton pad 370 to disinfect the use surface, thereby improving the antibacterial ability of the positive pressure valve end 110. A large amount of disinfectant can be stored in the middle space 350, which is convenient for disinfection at any time during the long-term protection of the positive pressure valve end 110.

[0034] The above is only the implementation manner of the present utility model, and does not limit the patent range of the present utility model, and any equivalent structure, direct or indirect application in other related technical fields by using the content of the present utility model specification and drawings are also within the patent protection range of the present utility model.

Claims

1. A protective cap for an indwelling needle, characterized in that: The device includes a first cap detachably connected to the side tube end of an indwelling needle, a liquid control mechanism disposed within the first cap, a second cap detachably connected to the positive pressure valve end of the indwelling needle, and a connector detachably connected between the first cap and the second cap. The outer wall of the first cap has a split cap portion with an internal hollow first cavity. The second cavity within the first cap communicates with the first cavity. The liquid control mechanism includes a liquid guiding mechanism disposed in the first cavity and an inner core disposed in the second cavity. The liquid guiding mechanism includes an internal liquid guiding chamber that can guide the liquid in the first cavity. A liquid guide rod reciprocates within the cavity. The liquid guide rod includes a limiting block at its end that can enter / exit the second cavity. The other end of the liquid guide rod is located outside the cap portion. The outer end of the liquid guide rod is connected to a protective cap detachably connected to the outer end of the liquid guide rod via an elastic element. The inner core can reciprocate within the second cavity and has a liquid guide groove. When the limiting block is engaged in the liquid guide groove, the liquid guide cavity, the liquid guide groove, and the side tube end can form a liquid guide passage. When the limiting block separates from the liquid guide groove, the liquid guide passage is disconnected. The second cap body has a hollow third cavity, the middle space of the third cavity stores disinfectant, the lower space of the third cavity is connected to the end of a positive pressure valve, and the third cavity is also provided with a liquid control component for controlling the flow of disinfectant from the middle space to the lower space. The outer wall of the second cap body is provided with an injection tube that communicates with the third cavity for injecting disinfectant into the middle space.

2. The indwelling needle protective cap according to claim 1, characterized in that: The liquid guiding rod further includes a main liquid guiding rod fixedly connected to the limiting block at one end, a connecting part fixedly connected to the other end of the main liquid guiding rod and located outside the first cavity, and a first spring sleeved inside the main liquid guiding rod and distributed in the first cavity. The liquid guiding cavity extends from the outer end face of the connecting part to the inner end face of the limiting block. The outer end of the connecting part is provided with an embedding groove, and a connecting ring is provided in the embedding groove. The connecting ring can rotate around the connecting part. At least two elastic elements are fixedly connected to the outer wall of the connecting ring. One of the elastic elements is fixedly connected to the protective cover, and the protective cover is screwed to the connecting part. The other elastic element is fixedly connected to a reinforcing silicone ring.

3. The indwelling needle protective cap according to claim 2, characterized in that: The inner core includes a gripping part disposed outside the second cavity, a core rod disposed at the lower end of the gripping part, a first core block and a second core block fixed to the outer periphery of the core rod and having an outer diameter larger than the outer diameter of the core rod and arranged at intervals, and a second spring distributed on the upper end of the first core block and sleeved on the core rod. The portion of the core rod located between the first core block and the second core block is defined as a liquid guiding section. The bottom surface of the first core block, the outer wall of the liquid guiding section, and the top surface of the second core block can be closed to form a U-shaped annular groove, which is defined as the liquid guiding groove. A liquid guiding channel is provided from the outer wall of the liquid guiding section to the bottom surface of the second core block. One end of the liquid guiding channel can communicate with the liquid guiding cavity, and the other opposite end can communicate with the interior of the side tube end.

4. The indwelling needle protective cap according to claim 3, characterized in that: Both the first core block and the second core block are provided with liquid-blocking sealing rings. When the first core block moves toward the direction close to the gripping part, it can compress the second spring, and the limiting block is inserted into the liquid guiding groove. When the limiting block moves toward the outside of the first cavity, the second spring returns to its original position, and the limiting block can abut against the outer wall of the first core block. The abutment position of the limiting block and the first core block and the liquid guiding groove are distributed between the two liquid-blocking sealing rings.

5. The indwelling needle protective cap according to claim 1, characterized in that: The third cavity is provided with a first partition and a second partition arranged at intervals to divide the internal space of the third cavity into three spaces: an upper space, a middle space, and a lower space distributed from top to bottom. The inner wall of the lower space is provided with an annular silicone sealing ring. The inner diameter of the annular silicone sealing ring is smaller than the outer diameter of the positive pressure valve end. The inner wall of the lower space is also provided with an internal thread located below the annular silicone sealing ring, which is screwed to the positive pressure valve end.

6. The indwelling needle protective cap according to claim 5, characterized in that: A silicone duckbill valve is fixed to the top of the annular silicone sealing ring. The port of the silicone duckbill valve faces the second partition. The silicone duckbill valve is used to prevent the liquid stored between the second partition and the annular silicone sealing ring from flowing down to the bottom of the annular silicone sealing ring.

7. The indwelling needle protective cap according to claim 6, characterized in that: The lower space inner wall is also provided with cotton pads distributed below the silicone duckbill valve.

8. The indwelling needle protective cap according to claim 5, characterized in that: The liquid control assembly includes a handle located outside the upper space, a first rod connected to the bottom end of the handle and having one end extend into the upper space, a third spring sleeved within the first rod and distributed within the upper space, a through hole perpendicularly penetrating the first partition, a liquid outlet hole perpendicularly penetrating the second partition, a second rod located at the bottom end of the first rod and able to pass through the through hole, and a sealing block located at the bottom end of the second rod and able to abut against the top of the liquid outlet hole to close the liquid outlet hole. The outer diameter of the first rod is larger than the outer diameter of the second rod, and the outer diameter of the first rod is also larger than the inner diameter of the through hole. When the sealing block moves away from the liquid outlet hole to discharge the liquid in the middle space into the lower space, the third spring can drive the sealing block back to its original position.

9. The indwelling needle protective cap according to claim 8, characterized in that: Both the bottom surface of the first rod and the bottom surface of the sealing block are provided with a sealing silicone layer, which can abut against the corresponding first partition and second partition respectively; an annular silicone block with an outer diameter larger than the inner diameter of the through hole is fixed to the outer wall of the second rod. When the sealing block moves away from the liquid outlet, the annular silicone block can abut against the bottom surface of the first partition to cover the through hole.

10. The indwelling needle protective cap according to any one of claims 1-9, characterized in that: The connector is made of an elastic material, and each end of the connector has an ear, which is screwed to the corresponding first cap and second cap.

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