Disposable venous anti-blocking indwelling needle

Abstract

The application discloses a one-time use vein anti-blocking indwelling needle, which comprises a catheter assembly, a blocking assembly and a needle tube. The catheter assembly comprises a flexible catheter, a catheter seat and a isolation plug assembly which are connected in sequence. The catheter seat is internally provided with a hollow inner cavity, and the side of the catheter seat is provided with a side branch interface. The blocking assembly comprises a knob, a blocking core and a blocking core seat. The knob is arranged outside the blocking core, the blocking core is arranged in the internal passage of the blocking core seat, the internal passage of the blocking core seat is communicated with the hollow inner cavity of the catheter seat, and the knob drives the blocking core to enter the hollow inner cavity and block the flexible catheter. The needle tube is arranged in the flexible catheter, the catheter seat and the isolation plug assembly. The front end of the needle tube extends a needle tip from the front end of the flexible catheter, and the rear end of the needle tube extends from the rear end of the isolation plug assembly and is connected with a needle handle. The application has the advantages of simple structure, low cost and the problems of blood reflux pipe blocking and needle puncture injury can be solved simultaneously.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a disposable indwelling needle for preventing venous occlusion. Background Technology

[0002] Indwelling intravenous catheters are widely used medical devices in clinical intravenous infusion therapy. The main problems with existing disposable indwelling intravenous catheters during use are as follows: First, during the interval between infusions, blood can easily flow back into the lumen of the catheter, causing blood to coagulate and form a thrombus, which can block the catheter. In order to keep the catheter open, medical staff need to perform flushing or sealing operations regularly, which not only increases the workload, but may also lead to the risk of infection or thrombus dislodgement. Second, after the puncture is completed, the needle is completely exposed after being pulled out of the catheter hub, making it very easy for medical staff to suffer needlestick injuries during subsequent treatment, and posing an occupational risk of infection with bloodborne diseases.

[0003] To address the aforementioned issues, existing technologies employ a thin, long sealing wire that runs through the entire inner lumen of the catheter to seal the tip opening. This involves multiple precision components such as multi-layered shell assemblies, bellows isolation parts, and pusher racks, resulting in an extremely complex product structure, difficult assembly, high manufacturing costs, and inconvenient operation for medical staff. Other existing technologies incorporate needle tip protection devices, but their structures are equally complex or require manual triggering, making operation inconvenient. Therefore, considering cost and ease of operation, most hospitals still use conventional indwelling needles for clinical use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a disposable intravenous anti-blockage indwelling needle that is simple in structure, low in cost, and can simultaneously solve the problems of blood backflow blockage and needlestick injury.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A disposable intravenous anti-occlusion indwelling needle, comprising: The catheter assembly includes a flexible catheter, a catheter seat, and an isolation plug assembly. The catheter seat has a hollow inner cavity. The rear end of the flexible catheter is connected to the front end of the catheter seat. The isolation plug assembly is interference-fitted to the rear end of the catheter seat. The side of the catheter seat has a side branch interface. An occlusion assembly includes a knob, an occlusion core, and an occlusion core seat. The knob is located outside the occlusion core, and the occlusion core is located in the internal passage of the occlusion core seat. The internal passage of the occlusion core seat communicates with the hollow inner cavity of the catheter seat. The knob drives the occlusion core into the hollow inner cavity and occludes the flexible catheter. The needle tube is inserted inside a flexible catheter, a catheter seat, and an isolation plug assembly. The front end of the needle tube extends from the front end of the flexible catheter to form a needle tip, and the rear end of the needle tube extends from the rear end of the isolation plug assembly and is connected to a needle handle. This design is simple in structure, low in cost, and can simultaneously solve the problems of blood backflow blocking the catheter and needlestick injuries.

[0006] As a preferred embodiment, the plugging seat includes a linear guide seat and a circular guide seat. The linear guide seat is disposed between the rear end of the catheter seat and the needle handle, and the linear guide seat has a needle tube passage and a plugging passage inside. The rear end of the needle tube extends from the rear end of the isolation plug assembly and connects to the needle handle through the needle tube passage of the linear guide seat. The circular guide seat has an annular guide groove in its circumference. The knob is engaged with the circular guide seat and forms a plugging passage of the circular guide seat with the annular guide groove. The plugging passage on the circular guide seat is connected to and tangentially arranged with the plugging passage of the linear guide seat. The fixed end of the plugging core is fixed to the knob and located in the plugging passage on the circular guide seat. The movable end of the plugging core extends from the plugging passage on the circular guide seat to the plugging passage of the linear guide seat. The movable end of the plugging core passes through the isolation plug assembly and enters the hollow inner cavity to plug the flexible catheter.

[0007] As a preferred embodiment, an air cavity is provided between the knob and the circular guide seat, and a breathable membrane communicating with the air cavity is provided on the knob.

[0008] As a preferred embodiment, a sealing ring is provided at the connection between the knob and the circular guide seat.

[0009] As a preferred embodiment, a support plate is provided at the rear end connection between the linear guide seat and the catheter seat. The front end of the support plate abuts against the rear end of the isolation plug assembly. The support plate has a needle tube passage for inserting a needle tube and a plugging core passage for inserting a plugging core.

[0010] As a preferred embodiment, a spring is provided at the connection between the rear end of the linear guide seat and the needle handle. When the needle tube is inserted into the spring, the spring presses against the shaft of the needle tube and the linear guide seat. When the needle is withdrawn, the needle handle drives the needle tube to be pulled back to the rear end. When the shaft of the needle tube is completely withdrawn from the spring pressing position and the needle tip of the needle tube is withdrawn to the spring position, the spring pops out and locks the needle tip of the needle tube under its own elastic force. At the same time, the spring separates from the linear guide seat and withdraws along with the needle tube.

[0011] As a preferred embodiment, the needle passage of the isolation plug assembly is eccentrically arranged, the axis of the needle passage of the isolation plug assembly is offset from the central axis of the catheter seat, and the needle is disposed within the needle passage of the isolation plug assembly.

[0012] As a preferred embodiment, the front end of the needle tube is provided with a protective cap, the rear end of the protective cap is sleeved on the front end of the catheter seat, and the rear end of the needle tube is provided with a rear cover, which is sleeved on the needle handle.

[0013] As a preferred embodiment, the catheter assembly further includes a catheter connector, the rear end of the flexible catheter is sleeved on the outer periphery of the front end of the catheter connector, the rear end of the catheter connector is fixed inside the front end of the catheter seat, and the flexible catheter is fixed between the catheter seat and the catheter connector.

[0014] As a preferred embodiment, the sealing core includes a sealing portion and a guiding portion. The sealing portion is wrapped around the outside of the guiding portion, and the front end of the guiding portion extends beyond the front end face of the sealing portion. When the sealing core moves to the sealing position, the sealing portion forms a sealing fit with the inner wall of the flexible conduit.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The sealing is achieved by driving the sealing core with a knob. The structure is simple, the number of parts is small, and the manufacturing cost is greatly reduced, making it suitable for large-scale production of disposable medical devices. (2) The operation is intuitive. The occlusion can be completed by rotating the knob. No complicated steps are required, which is in line with clinical operating habits. (3) The sealing is reliable and can effectively prevent blood backflow and thrombus formation, reduce the frequency of flushing, and reduce the risk of infection; (4) Compared with the complex structure of the prior art, the present invention solves the problem of needle puncture prevention while ensuring the basic sealing function, significantly simplifies the structure and has obvious cost advantages. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the anti-clogging indwelling needle structure in Embodiment 1 of the present invention; Figure 2 This is an exploded view of the anti-clogging indwelling needle structure of Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of the anti-clogging indwelling needle structure of Embodiment 1 of the present invention; Figure 4 This is an exploded view of the anti-clogging indwelling needle structure of Embodiment 2 of the present invention; Figure 5 This is a cross-sectional view of the anti-clogging indwelling needle structure in Embodiment 2 of the present invention; The attached diagram lists the following components: catheter assembly 1, flexible catheter 11, catheter seat 12, isolation plug assembly 13, hollow inner cavity 14, side branch interface 15, catheter connector 16, sealing assembly 2, knob 21, sealing core 22, sealing part 221, guide part 222, plug seat 23, linear guide seat 231 and circular guide seat 232, annular guide groove 233, air cavity 234, breathable membrane 235, sealing ring 236, support plate 237, needle tube 3, needle tip 31, needle handle 32, protective cap 33, rear cover 34, spring 4. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments. These embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0018] Example: like Figures 1-3 As shown, a disposable intravenous anti-occlusion indwelling needle includes: The catheter assembly 1 includes a flexible catheter 11, a catheter seat 12, and an isolation plug assembly 13. The catheter seat 12 has a hollow inner cavity 14. The rear end of the flexible catheter 11 is connected to the front end of the catheter seat 12. The isolation plug assembly 13 is interference-fitted to the rear end of the catheter seat 12. The catheter seat 12 has a side branch interface 15 on its side. The occlusion assembly 2 includes a knob 21, an occlusion core 22, and an occlusion core seat 23. The knob 21 is disposed outside the occlusion core 22, and the occlusion core 22 is disposed in the internal passage of the occlusion core seat 23. The internal passage of the occlusion core seat 23 is connected to the hollow inner cavity 14 of the catheter seat 12. The knob 21 drives the occlusion core 22 into the hollow inner cavity 14 and occludes the flexible catheter 11. The needle tube 3 is inserted inside the flexible catheter 11, the catheter seat 12 and the isolation plug assembly 13. The front end of the needle tube 3 extends from the front end of the flexible catheter 11 to form a needle tip 31, and the rear end of the needle tube 3 extends from the rear end of the isolation plug assembly 13 and is connected to a needle handle 32.

[0019] Specifically, the disposable intravenous anti-blockage indwelling needle of the present invention achieves reliable blocking function by driving the blocking core 22 through a simple knob 21, effectively solving the problem of easy blockage of existing indwelling needles. At the same time, it has a simple structure, few parts, low cost, and convenient operation, making it suitable for large-scale promotion and application of disposable medical devices, and has good clinical and economic value.

[0020] Preferably, the plug seat 23 includes a linear guide seat 231 and a circular guide seat 232. The linear guide seat 231 is disposed between the rear end of the catheter seat 12 and the needle handle 32, and the linear guide seat 231 has a needle tube passage and a plug seat passage inside. The rear end of the needle tube 3 extends from the rear end of the isolation plug assembly 13 and connects to the needle handle 32 through the needle tube passage of the linear guide seat 231. The circular guide seat 232 has an annular guide groove 233 circumferentially disposed. The knob 21 is engaged with the circular guide seat 232 and then engages with the annular guide groove 233. 33 forms a plugging passage in the circular guide seat 232. The plugging passage on the circular guide seat 232 is connected to and tangentially arranged with the plugging passage of the linear guide seat 231. The fixed end of the plugging core 22 is fixed on the knob 21 and located in the plugging passage on the circular guide seat 232. The moving end of the plugging core 22 extends out of the plugging passage of the linear guide seat 231 through the plugging passage on the circular guide seat 232. After passing through the isolation plug assembly 13, the moving end of the plugging core 22 enters the hollow inner cavity 14 and plugs the flexible conduit 11.

[0021] Specifically, the present invention adopts a tangential arrangement of linear guide seat 231 and circular guide seat 232. Through a clever motion conversion design, the rotational motion of knob 21 is smoothly converted into the linear feed motion of sealing core 22, realizing precise guidance and reliable sealing of sealing core 22. This structure has many advantages such as compact space, labor-saving operation, precise guidance, reliable sealing, and easy assembly.

[0022] More preferably, an air cavity 234 is provided between the knob 21 and the circular guide seat 232, and a breathable membrane 235 communicating with the air cavity 234 is provided on the knob 21.

[0023] Specifically, the present invention achieves automatic pressure balance by setting an air cavity 234 between the knob 21 and the circular guide seat 232, and setting a breathable membrane 235 on the knob 21 that communicates with the air cavity 234.

[0024] More preferably, a sealing ring 236 is provided at the connection between the knob 21 and the circular guide seat 232.

[0025] Specifically, the present invention provides a sealing ring 236 at the connection between the knob 21 and the circular guide seat 232, which achieves multiple functions such as preventing liquid infiltration, maintaining the airtightness of the air cavity 234, preventing microbial invasion, and adapting to dynamic sealing at extremely low cost. The sealing ring 236 and the breathable membrane 235 work together to form a sealing and sterility protection system for the indwelling needle.

[0026] More preferably, a support plate 237 is provided at the rear end connection between the linear guide seat 231 and the catheter seat 12. The front end of the support plate 237 abuts against the rear end of the isolation plug assembly 13. The support plate 237 has a needle tube passage for inserting the needle tube 3 and a plugging core passage for inserting the plugging core 22.

[0027] Specifically, the present invention provides a support piece 237 at the rear end connection between the linear guide seat 231 and the catheter seat 12. The front end of the support piece 237 abuts against the rear end of the isolation plug assembly 13 to achieve reliable fixation of the isolation plug assembly 13. The support piece 237 has needle tube passage and plugging core passage, providing independent passage and auxiliary guidance for the needle tube 3 and the plugging core 22, respectively. This structure has multiple beneficial effects such as fixing the isolation plug assembly 13, providing auxiliary guidance, preventing over-insertion, maintaining movement independence, simplifying assembly, and enhancing structural stability.

[0028] Preferably, the needle passage of the isolation plug assembly 13 is eccentrically arranged, the axis of the needle passage of the isolation plug assembly 13 is offset from the central axis of the catheter seat 12, and the needle 3 is disposed in the needle passage of the isolation plug assembly 13.

[0029] Specifically, the isolation plug assembly 13 is made of an elastic material, such as silicone. After the needle tube 3 is pulled out, the needle tube passage of the isolation plug assembly 13 can close and seal itself. Furthermore, the eccentric arrangement design enables the coexistence of the needle tube passage and the blocking passage in a limited space, avoiding structural interference and providing an independent movement space for the blocking core 22. This not only achieves the anti-blocking function of the indwelling needle but also has a compact structure.

[0030] Preferably, the front end of the needle tube 3 is provided with a protective cap 33, the rear end of the protective cap 33 is sleeved on the front end of the catheter seat 12, and the rear end of the needle tube 3 is provided with a rear cover 34, which is sleeved on the needle handle 32.

[0031] Specifically, the present invention completely covers and protects the flexible catheter 11, the needle tip 31, and the needle handle 32. The cap 33 has beneficial effects such as protecting the needle tip 31 and the flexible catheter 11, maintaining a sterile state, and preventing accidental needlestick injuries. The rear cover 34 has beneficial effects such as maintaining the cleanliness of the inside of the needle handle 32 and being easy to remove. The two work together to achieve fully enclosed protection of the indwelling needle from the time it leaves the factory to the time it is used, ensuring the integrity, sterility, and safety of the product.

[0032] Preferably, the catheter assembly 1 further includes a catheter connector 16, the rear end of the flexible catheter 11 is sleeved on the outer periphery of the front end of the catheter connector 16, the rear end of the catheter connector 16 is fixed inside the front end of the catheter seat 12, and the flexible catheter 11 is fixed between the catheter seat 12 and the catheter connector 16.

[0033] Specifically, the catheter connector 16 is a metal wedge structure, made of materials such as stainless steel or medical metal, which gives the catheter connector 16 higher fixing strength and can effectively prevent the flexible catheter 11 from falling off. At the same time, the catheter connector 16 can form internal support for the rear end of the flexible catheter 11 to resist external pressure and prevent the flexible catheter 11 from being crushed and blocked at that point.

[0034] Preferably, the sealing core 22 includes a sealing part 221 and a guide part 222. The sealing part 221 is wrapped around the outside of the guide part 222. The front end of the guide part 222 extends out of the front end face outside the sealing part 221. When the sealing core 22 moves to the sealing position, the sealing part 221 forms a sealing fit with the inner wall of the flexible conduit 11.

[0035] Specifically, the sealing core 22 of the present invention adopts a double-layer composite structure of a guide part 222 and a sealing part 221. This double-layer structure realizes the separation of the guiding function and the sealing function. The relatively rigid guide part 222 provides axial stiffness and precise guidance, while the elastic sealing part 221 provides reliable sealing. The synergistic effect of the two makes the sealing core 22 have multiple beneficial effects such as low insertion resistance, high guiding accuracy, reliable sealing, and labor-saving operation, thereby achieving a reliable sealing function.

[0036] Furthermore, in this embodiment, the method of use is as follows: Before puncture, take the indwelling needle out of the packaging, remove the protective cap 33, perform venous puncture, and after seeing blood return, push the flexible catheter 11 into the blood vessel, hold the catheter seat 12, pull the needle handle 32 backward, and withdraw the needle tube 3 and needle handle 32 as a whole. Connect the side branch interface 15 of the indwelling needle to the infusion connector for infusion. After the infusion is completed, rotate the knob 21 to drive the sealing core 22 to move to the sealing position. The sealing part 221 seals with the inner wall of the flexible catheter 11 to block blood backflow. When infusion is performed next time, rotate the knob 21 in the opposite direction to remove the sealing core 22 and restore the patency of the tubing. Example 2:

[0037] As a preferred embodiment, such as Figures 4-5 As shown, the difference between this embodiment and embodiment 1 is that a spring piece 4 is provided at the connection between the rear end of the linear guide seat 231 and the needle handle 32. When the needle tube 3 is inserted into the spring piece 4, the spring piece 4 presses between the rod of the needle tube 3 and the linear guide seat 231. When the needle is withdrawn, the needle handle 32 drives the needle tube 3 to be pulled to the rear end. When the rod of the needle tube 3 is completely withdrawn from the pressing position of the spring piece 4 and the needle tip 31 of the needle tube 3 is withdrawn to the position of the spring piece 4, the spring piece 4 pops out and locks the needle tip 31 of the needle tube 3 under its own elastic force. At the same time, the spring piece 4 separates from the linear guide seat 231 and withdraws with the needle tube 3.

[0038] Specifically, this invention provides a spring piece 4 at the connection between the rear end of the linear guide seat 231 and the needle handle 32. During the needle withdrawal process, the natural action of the needle tube 3 retracting from the holding position automatically triggers the spring piece 4 to pop out, achieving immediate locking and wrapping of the needle tip 31. At the same time, the spring piece 4 separates from the linear guide seat 231 and withdraws along with the needle tube 3. Using the spring piece 4 as an anti-needle puncture component has multiple beneficial effects, such as automatic triggering, precise triggering timing, complete wrapping of the needle tip 31, simple structure, low cost, no impact on operation feel, and irreversible anti-needle puncture function. It effectively solves the problems of high needle puncture risk of existing indwelling needles, cumbersome operation, complex structure, insufficient reliability, and high cost of anti-needle puncture devices.

[0039] Furthermore, in this embodiment, the method of use is as follows: Before puncture, take the indwelling needle out of the packaging, remove the protective cap 33, perform venous puncture, and after seeing blood return, push the flexible catheter 11 into the blood vessel, hold the catheter seat 12, pull the needle handle 32 backward, and withdraw the needle tube 3 and needle handle 32 as a whole. During the needle withdrawal process, the spring 4 automatically pops out and locks the needle tip 31, and withdraws along with the needle tube 3. Connect the side branch interface 15 of the indwelling needle to the infusion connector for infusion. After the infusion is completed, rotate the knob 21 to drive the sealing core 22 to move to the sealing position. The sealing part 221 and the inner wall of the flexible catheter 11 are in an interference seal to block blood backflow. When infusion is performed next time, rotate the knob 21 in the opposite direction to remove the sealing core 22 and restore the patency of the tubing.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A disposable intravenous anti-occlusion indwelling needle, characterized in that, include: The catheter assembly includes a flexible catheter, a catheter seat, and an isolation plug assembly. The catheter seat has a hollow inner cavity. The rear end of the flexible catheter is connected to the front end of the catheter seat. The isolation plug assembly is interference-fitted to the rear end of the catheter seat. The side of the catheter seat has a side branch interface. An occlusion assembly includes a knob, an occlusion core, and an occlusion core seat. The knob is located outside the occlusion core, and the occlusion core is located in the internal passage of the occlusion core seat. The internal passage of the occlusion core seat communicates with the hollow inner cavity of the catheter seat. The knob drives the occlusion core into the hollow inner cavity and occludes the flexible catheter. The needle tube is inserted inside the flexible catheter, the catheter seat, and the isolation plug assembly. The front end of the needle tube extends from the front end of the flexible catheter to form a needle tip, and the rear end of the needle tube extends from the rear end of the isolation plug assembly and is connected to a needle handle.

2. The disposable intravenous anti-occlusion indwelling needle according to claim 1, characterized in that: The plugging seat includes a linear guide seat and a circular guide seat. The linear guide seat is located between the rear end of the catheter seat and the needle handle, and the linear guide seat has a needle tube passage and a plugging core passage inside. The rear end of the needle tube extends from the rear end of the isolation plug assembly and connects to the needle handle through the needle tube passage of the linear guide seat. The circular guide seat has an annular guide groove in its circumference. The knob is engaged with the circular guide seat and forms a plugging core passage of the circular guide seat with the annular guide groove. The plugging core passage on the circular guide seat is connected to and tangentially arranged with the plugging core passage of the linear guide seat. The fixed end of the plugging core is fixed to the knob and located in the plugging core passage on the circular guide seat. The moving end of the plugging core extends out of the plugging core passage of the linear guide seat through the plugging core passage on the circular guide seat. The moving end of the plugging core passes through the isolation plug assembly and enters the hollow inner cavity to plug the flexible catheter.

3. The disposable intravenous anti-occlusion indwelling needle according to claim 2, characterized in that: An air cavity is provided between the knob and the circular guide seat, and a breathable membrane communicating with the air cavity is provided on the knob.

4. A disposable intravenous anti-occlusion indwelling needle according to claim 2, characterized in that: A sealing ring is provided at the connection between the knob and the circular guide seat.

5. A disposable intravenous anti-occlusion indwelling needle according to claim 2, characterized in that: A support plate is provided at the rear end connection between the linear guide seat and the catheter seat. The front end of the support plate abuts against the rear end of the isolation plug assembly. The support plate has a needle tube passage for inserting a needle tube and a plugging core passage for inserting a plugging core.

6. A disposable intravenous anti-occlusion indwelling needle according to claim 2, characterized in that: A spring is provided at the connection between the rear end of the linear guide seat and the needle handle. When the needle tube is inserted into the spring, the spring presses against the shaft of the needle tube and the linear guide seat. When the needle is withdrawn, the needle handle drives the needle tube to be pulled to the rear end. When the shaft of the needle tube is completely withdrawn from the spring pressing position and the needle tip of the needle tube is withdrawn to the spring position, the spring pops out and locks the needle tip of the needle tube under its own elastic force. At the same time, the spring separates from the linear guide seat and withdraws with the needle tube.

7. A disposable intravenous anti-occlusion indwelling needle according to claim 1, characterized in that: The needle passage of the isolation plug assembly is eccentrically arranged, and the axis of the needle passage of the isolation plug assembly is offset from the central axis of the catheter seat. The needle is disposed within the needle passage of the isolation plug assembly.

8. A disposable intravenous anti-occlusion indwelling needle according to claim 1, characterized in that: The needle tube has a protective cap at its front end, the rear end of which is fitted onto the front end of the catheter seat, and a rear cover at its rear end, which is fitted onto the needle handle.

9. A disposable intravenous anti-occlusion indwelling needle according to claim 1, characterized in that: The catheter assembly further includes a catheter connector, the rear end of the flexible catheter is sleeved on the outer periphery of the front end of the catheter connector, the rear end of the catheter connector is fixed inside the front end of the catheter seat, and the flexible catheter is fixed between the catheter seat and the catheter connector.

10. A disposable intravenous anti-occlusion indwelling needle according to claim 1, characterized in that: The sealing core includes a sealing part and a guiding part. The sealing part is wrapped around the outside of the guiding part, and the front end of the guiding part extends beyond the front end face of the sealing part. When the sealing core moves to the sealing position, the sealing part forms a sealing fit with the inner wall of the flexible conduit.

Images