CN116474209A - Self-retracting indwelling needle for anti-blood spillage - Google Patents

Abstract

This application relates to the field of medical devices, mainly related to the self-retracting indwelling needle for preventing blood spillage, in order to solve the problem of needle core slope deflection and reduce the puncture success rate of the indwelling needle; the solution of the application includes a catheter assembly and a needle tube assembly installed on the catheter assembly; the catheter assembly includes a mounting seat and a catheter, and the catheter is installed on the mounting seat; It is installed in the conduit; the installation shell is connected with the installation seat, and a limit assembly is arranged on the installation shell, and the limit assembly restricts the axial movement of the installation shell on the installation seat. The scheme of the present application improves the success rate of indwelling needle puncture.

Description

Self-retracting indwelling needle for anti-blood spillage

technical field

The application relates to the field of medical devices, in particular to an automatically retractable indwelling needle for preventing blood spillage.

Background technique

The indwelling needle is also called the venous trocar. The core components include a soft catheter/cannula that can be indwelled in the blood vessel, and a stainless steel puncture guide core. When in use, the catheter and the needle core are punctured into the blood vessel together. After the catheter has completely entered the blood vessel, the needle core is withdrawn, and only the soft catheter is left in the blood vessel for infusion therapy.

In order to facilitate the removal of the needle core from the catheter, the connection shell of the needle core and the catheter connection shell are usually directly sleeved to complete the installation of the traditional indwelling needle. However, the circular shell is directly sleeved and installed, which is easy to rotate during use;

Contents of the invention

In order to improve the success rate of indwelling needle puncture, the present application provides an automatically retractable indwelling needle to prevent blood spillage.

The self-retracting indwelling needle for preventing blood spillage provided by this application adopts the following technical scheme:

The self-retracting indwelling needle for preventing blood spillage includes a catheter assembly and a needle tube assembly installed on the catheter assembly; the catheter assembly includes a mounting seat, a catheter and an anti-blood return assembly. into the conduit, the retracting assembly is installed on the needle base and controls the needle base to slide in the mounting shell, so that the needle tube is retracted into the mounting shell; the mounting shell is disassembled and connected to the mounting seat, and the mounting shell is provided with a limiting assembly, and the limiting assembly restricts the axial movement of the mounting shell on the mounting seat.

By adopting the above technical solution, when the mounting shell is installed on the mounting base, the limit assembly restricts the axial movement of the mounting shell on the mounting base, and at the same time, the needle tube passing through the mounting shell is inserted into the mounting base and into the catheter, and finally protrudes from the end of the catheter away from the mounting shell; when in use, the medical staff inserts the catheter with the needle tube into the skin of the patient, and when the catheter with the needle tube moves into the blood vessel, the medical staff withdraws the needle tube; The relative fixation of the needle tube and the catheter reduces the pain of the patient when the needle is poked; at the same time, it reduces the bending of the needle tube during the puncture process of the indwelling needle, thereby reducing the occurrence of the needle tube piercing the blood vessel; at the same time, it reduces the deflection of the inclined plane of the needle tube during the puncture process and improves the success rate of the indwelling needle puncture.

Optionally, the limiting assembly includes a plurality of limiting blocks, the plurality of limiting blocks are installed on the end wall of the installation shell, and the mounting seat is provided with a number of slots close to the end wall of the installation shell, the number of the slots is equal to the number of the limiting blocks, and the limiting blocks are inserted into the slots.

By adopting the above-mentioned technical solution, when the installation shell is close to the mounting seat, the limit block slowly slides into the slot along the end of the slot. When the installation shell and the mounting seat are installed, the end of the limit block is in contact with the bottom of the slot, and the side wall of the limit block is limited by the inner wall of the slot, so that the limit block cannot move along the circumferential direction of the mounting seat, so that the mounting shell is stably installed on the mounting seat, and it is difficult to rotate circumferentially during use; Position, reducing the bending of the needle tube during the puncture process of the indwelling needle, thereby reducing the occurrence of the needle tube piercing the blood vessel.

Optionally, a groove is provided on the side wall of the limiting block facing the axial direction of the installation shell, the groove communicates with the side wall of the mounting seat, and a protrusion is provided on the inner wall of the groove, and the protrusion is inserted into the groove.

By adopting the above-mentioned technical solution, when the end of the limiting block is in contact with the bottom of the slot, the protrusion is inserted into the groove, and the inner wall of the groove limits the movement of the protrusion; when the protrusion needs to be moved out of the groove, the medical personnel need to use external force to pull the installation shell, so that the deformation of the limiting block can occur, and finally the protrusion is moved out of the groove.

Optionally, the section of the protrusion is an arc block, the arc block is covered with an elastic sleeve, the inner wall of the groove is provided with a pressing bar, and the elastic sleeve is provided with a pressing gap in a direction away from the installation shell, the elastic sleeve and the protrusion are inserted into the groove at the same time, and the pressing bar is inserted into the pressing gap.

By adopting the above technical solution, when the mounting seat and the mounting shell need to be separated, the medical personnel use external force to pull the mounting shell away from the mounting seat. At this time, the limit block is deformed, and the protrusion tends to move out of the groove; but after the pressing bar is inserted into the pressing gap, the pressing bar restricts the inner wall of the pressing gap. When the protrusion is gradually moved out of the groove, the pressing bar will gradually peel off the elastic sleeve from the protrusion. Finally, the protrusion is completely removed from the groove, and the elastic sleeve remains in the groove. Inside; the setting of the elastic sleeve makes the limit block more stable when inserted in the card slot.

Optionally, the limit assembly includes a limit connection arc plate, a limit block, a limit shrapnel and a limit slip ring. The limit connection arc plate is installed at one end of the installation shell close to the mounting seat. The limit connection arc plate is sleeved on the installation seat. One end of the sheet passes through the limit connection hole and is inserted into the limit connection groove to be connected with the limit block. The other end of the limit shrapnel is connected with the limit slip ring, and the limit slip ring is slipped and sleeved on the limit connection arc plate; the outer wall of the mounting seat is provided with a limit slot for the limit block to be inserted.

By adopting the above technical scheme, when the installation shell needs to be connected with the mounting seat, first move the limit connecting arc plate to the direction of the mounting seat, and gradually increase the contact area between the limit connecting arc plate and the mounting seat. The direction of the mounting seat moves, so the limit shrapnel is partially bent in the limit connection groove;

When the limit connection arc plate is completely sleeved on the installation shell, the limit connection groove is aligned with the limit groove, the limit block loses the restriction of the outer peripheral side wall of the mounting seat, and the curved limit shrapnel applies a pulling force to the limit block to make it break out of the limit connection groove, and the limit block is smoothly inserted into the limit slot under the action of the limit spring piece. At this time, a part of the limit block is in the limit groove, and a part is in the limit connection groove;

When the mounting seat and the mounting shell need to be separated, the medical personnel pull the limit slip ring in the direction away from the mount seat, and the limit slip ring slides on the limit connection arc plate. At this time, the limit slip ring pulls the limit shrapnel, and the limit shrapnel pulls the limit block out of the limit groove.

Using the cooperation of the limit block and the limit shrapnel, the installation shell and the installation seat cannot rotate in the circumferential direction during the connection process, and the connection is relatively stable; and by utilizing the contact between the limit block and the bottom of the limit connection groove after the limit block is released from the limit groove, the force of pulling the limit slip ring is used on the disassembly of the installation seat and the installation shell at the same time, so that a pulling force can not only release the locking effect of the limit block on the installation seat, but also separate the installation seat from the installation shell.

Optionally, a limit bar is arranged on the limit connecting arc plate, and the limit bar limits the sliding distance of the limit slip ring on the limit connecting arc plate.

By adopting the above-mentioned technical scheme, when the limit slip ring is in contact with the limit bar, the limit block is completely disengaged from the limit groove. At this time, continuing to apply force can drive the limit connecting arc plate to be taken off from the mounting seat.

Optionally, the anti-bleed assembly is connected to one end of the catheter, and the anti-bleed assembly is installed in the mounting seat; the anti-bleed assembly includes a rivet sleeve, a valve core sleeve and a plastic bonnet, the rivet sleeve communicates with the end of the catheter in the mounting seat, and a valve groove is opened at the end of the mounting seat close to the installation shell, and the valve core sleeve is inserted in the valve groove to communicate with the rivet sleeve. There is an axial sliding arrangement along the valve slot in the valve slot; the needle tube runs through the plastic valve cap, and passes through the valve core sleeve, rivet sleeve and guide tube in turn.

By adopting the above-mentioned technical scheme, the medical personnel hold the mounting shell to remove the mounting shell from the mounting seat, and the deformability of the plastic bonnet will close the end punctured by the needle tube; then the medical personnel insert the Luer connector into the valve groove, and push the plastic valve cap to move in the valve groove, the inclined end surface of the valve core sleeve pierces the plastic valve cap again and communicates with the Luer connector to facilitate communication with the infusion device or blood collection device connected to the Luer connector; through the cooperation of the plastic valve cap and the valve core sleeve, avoid Blood splatter.

Optionally, the retracting assembly is installed on the mounting shell to retract the needle tube into the mounting shell; the retracting assembly includes a spring and a trigger for controlling the recovery of the spring, the spring is sleeved on the needle hub, the spring is located between the tail end of the needle hub and the inner end wall of the mounting shell, and the trigger is mounted on the mounting shell to control the recovery of the spring.

Optionally, the trigger member includes a trigger block connected to the needle seat and a trigger slider slidingly installed on the installation shell. A trigger hole is provided on the installation shell. A friction ramp and a sliding straight path for the trigger block to slide are opened on the inner wall of the installation shell. On the trigger support boss, a trigger protrusion is arranged on the bottom wall of the trigger slide button close to the trigger hole.

By adopting the above technical solution, when the position is moved to the desired position, the medical staff pushes the mounting seat forward; at the same time, the medical staff moves the trigger slide button towards the mounting base, and when the trigger slide button is no longer in contact with the trigger support boss, press the trigger slide button, the trigger protrusion is inserted into the trigger hole and the trigger block is pressed, the trigger block loses the restriction of the trigger support boss, and the thrust of the spring makes the trigger block move along the friction ramp and enters the sliding straight track. , so as to completely retract the needle tube into the retraction channel; the trigger slider is matched with a spring to realize the automatic retraction of the needle tube, and reduce the situation of mis-stamping after the needle tube is pulled out.

Optionally, the inner side wall of the installation shell is provided with a limit ring groove, and a limit stop ring is arranged in the limit ring groove. The inner diameter of the limit ring groove is greater than the outer diameter of the limit stop ring, and the depth of the limit ring groove is greater than the ring width of the limit stop ring; the outer peripheral side wall of the end of the needle holder away from the needle tube is provided with a lock groove for the limit stop ring to be embedded.

By adopting the above technical scheme, the limit stop ring moves in the limit ring groove under the guidance of the inclined annular guide surface, and the center of the limit stop ring gradually approaches the axis of the mounting shell, and finally the limit stop ring enters the lock groove along the inclined annular guide surface, and again under the action of gravity, the center of the limit stop ring is far away from the axis of the installation shell. Direction movement; reduce the spring thrust is too large, resulting in the occurrence of needle seat rebound.

In summary, the present application includes at least one of the following beneficial technical effects:

1. When in use, the medical staff insert the catheter with the needle tube into the skin of the patient. When the catheter with the needle tube moves into the blood vessel, the medical staff retracts the needle tube. At the same time, the medical staff triggers the retraction component, which drives the needle tube to automatically retract into the installation shell, and the end of the needle tube close to the catheter is also completely recovered into the installation shell. The position is relatively fixed during the installation process, which ensures that the needle tube and the catheter are relatively fixed when the medical staff pokes the needle, reduces the pain of the patient when the needle is poked, and at the same time reduces the bending of the needle tube during the puncture of the indwelling needle, thereby reducing the occurrence of the needle tube piercing the blood vessel, reducing the deflection of the needle tube slope during the puncture process, and improving the success rate of indwelling needle puncture;

2. Using the cooperation of the limit block and the limit shrapnel, the installation shell and the installation seat cannot rotate in the circumferential direction during the connection process, and the connection is relatively stable; and by using the contact between the limit block and the bottom of the limit connection groove after the limit block is released from the limit groove, the force that pushes the limit slip ring is used on the disassembly of the installation seat and the installation shell at the same time, so that a thrust can not only release the locking effect of the limit block on the installation seat, but also separate the installation seat from the installation shell.

Description of drawings

FIG. 1 is a schematic structural view of the self-retracting indwelling needle for preventing blood spillage in Example 1 of the present application.

Fig. 2 is a schematic vertical sectional view showing the connection relationship between the catheter assembly and the needle tube assembly in Embodiment 1 of the present application.

Fig. 3 is a schematic vertical cross-sectional view showing the internal structure of the catheter assembly in Embodiment 1 of the present application.

FIG. 4 is a schematic transverse cross-sectional view illustrating the connection between the mounting seat and the mounting shell in Embodiment 1 of the present application.

FIG. 5 is an enlarged schematic view of A in FIG. 4 .

Fig. 6 is a schematic vertical cross-sectional view showing the internal structure of the needle tube assembly in Embodiment 1 of the present application.

FIG. 7 is an enlarged schematic view of B in FIG. 6 .

Fig. 8 is a diagram showing the movement state of the needle holder in Embodiment 1 of the present application.

FIG. 9 is a schematic transverse cross-sectional view showing the connection between the mounting seat and the mounting shell in Embodiment 2 of the present application.

FIG. 10 is an enlarged schematic view of C in FIG. 9 .

Fig. 11 is a schematic transverse cross-sectional view showing the connection mode between the mounting base and the mounting shell in Embodiment 3 of the present application.

FIG. 12 is an enlarged schematic view of D in FIG. 11 .

Explanation of reference signs: 1, catheter assembly; 11, mounting seat; 111, card slot; 1111, bump; 1112, elastic sleeve; 1113, tight gap; 112, limit groove; 113, valve slot; Inclined end face; 133, plastic bonnet; 2, needle tube assembly; 21, installation shell; 211, trigger hole; 2111, trigger support boss; 212, friction ramp; 213, sliding straight track; 214, limit ring groove; 215, limit stop ring; , column groove; 234, plunger; 24, retraction assembly; 241, spring; 242, trigger piece; 2421, trigger block; 2422, trigger slider; 2423, trigger protrusion; 3, limit component; 31, limit block; 23, limit strip; 3231, protrusion; 33, limit block; 34, limit shrapnel; 35, limit slip ring; 351, slip groove.

Detailed ways

The present application will be described in further detail below in conjunction with accompanying drawings 1-12.

The embodiment of the present application discloses a self-retracting indwelling needle for preventing blood spillage.

Example 1

Referring to Figures 1 and 2, the self-retracting indwelling needle for preventing blood spillage includes a catheter assembly 1, and one end of the catheter assembly 1 is connected with a needle assembly 2; the catheter assembly 1 includes a mount 11 and a catheter 12, the catheter 12 is installed in the mount 11, and one end of the catheter 12 is provided with an anti-blood return component 13, which is preset in the mount 11, and the outer wall of the end of the mount 11 away from the catheter 12 is integrally formed with a threaded lug 116, and the threaded lug 116 can be connected with Luer connector connection.

The needle tube assembly 2 includes a mounting shell 21 and a needle tube 22. The mounting shell 21 is disassembled and connected to the mounting base 11, and the outer wall of the mounting shell 21 is integrally formed with a pinch block 217 for kneading by medical personnel. The pinch block 217 is arranged on both sides of the axial direction of the mounting shell 21; Assembly 24 , the retraction assembly 24 can completely retract the needle tube 22 passing through the installation shell 21 into the installation shell 21 .

One end of the mounting shell 21 is provided with a limiting component 3. When the mounting shell 21 is mounted on the mounting base 11, the limiting component 3 restricts the circumferential movement of the mounting shell 21 on the mounting base 11. At the same time, the needle tube 22 passing through the mounting shell 21 is inserted into the mounting base 11, and inserted into the conduit 12, and finally protrudes from the end of the conduit 12 away from the mounting shell 21. At this time, the distance between the end of the conduit 12 in the direction away from the mounting base 11 and the root of the needle tube 22 is called the Lai distance, and the length interval of the Lai distance is 0. -1mm, the length of the distance in this embodiment is 0.3±0.2mm; the outer wall of the needle tube 22 is attached to the inner wall of the catheter 12.

When in use, the medical staff insert the catheter 12 with the needle tube 22 into the skin of the patient. When the catheter 12 with the needle tube 22 moves into the blood vessel, the medical staff needs to retract the needle tube 22. The medical staff triggers the retraction component 24, which drives the needle tube 22 to automatically retract into the installation shell 21. The anti-blood return component 13 has the effect of blocking the blood at the catheter 12 at the moment the needle tube 22 is detached from the mounting base 11, preventing blood from spilling out of the mounting base 11.

Referring to Fig. 3 , the mounting base 11 is provided with a flow channel 114 for blood circulation along its axial direction, the flow channel 114 runs through the entire mounting base 11, one end of the conduit 12 is inserted in the flow channel 114 of the mounting base 11, and the other end extends out of the mounting base 11; along the axial direction of the fluid channel 114, a rivet groove 115 and a valve groove 113 are sequentially opened.

A rivet cover 131 is placed in the rivet groove 115. One end of the rivet cover 131 is funnel-shaped, and the other end is tubular. The end is located in the rivet groove 115, and the inner wall of the rivet groove 115 is attached to the funnel-shaped outer wall of the rivet sleeve 131.

The inner diameter of the valve slot 113 is larger than that of the rivet slot 115, and a valve core sleeve 132 is placed in the valve slot 113. One end of the valve core sleeve 132 close to the rivet slot 115 is attached to the inner end wall of the valve slot 113, so as to realize the connection between the valve core sleeve 132 and the rivet sleeve 131.

The outer diameter of the end of the spool cover 132 away from the rivet cover 131 is smaller than the groove diameter of the valve groove 113, and an inclined end face 1321 is formed. The end of the spool cover 132 away from the rivet cover 131 is provided with a plastic bonnet 133. The material of the plastic bonnet 133 is soft and elastic. When the rubber bonnet 133 is set on the spool sleeve 132, the outer peripheral side wall of the spool sleeve 132 is in close contact with the protruding part of the plastic bonnet 133, and the outer peripheral side wall of the plastic bonnet 133 is pressed against the inner side wall of the valve groove 113, thereby closing the flow channel 114.

At least one of the plastic valve cap 133 and the valve core sleeve 132 is slidably disposed in the valve slot 113 along the axial direction of the valve slot 113 . When the plastic valve cap 133 and the valve core sleeve 132 move relative to each other, the inclined end surface 1321 of the valve core sleeve 132 pierces the plastic valve cap 133 and makes the flow channel 114 conduct. In this embodiment, the position of the valve core sleeve 132 is fixed, and the plastic valve cap 133 can slide along the axial direction of the valve slot 113 .

Referring to Fig. 1 and Fig. 4, when the installation shell 21 is inserted in the installation seat 11, the position-limiting assembly 3 plays a position-limiting role. The position-limiting assembly 3 includes several position-limiting blocks 31. Plug in.

Mounting seat 11 is provided with several draw-in grooves 111 near the outer side wall of mounting shell 21, and the quantity of opening of draw-in grooves 111 is equal to the quantity of limiting blocks 31. In the present embodiment, the number of draw-in grooves 111 is two, and the two engaging grooves 111 are opened symmetrically along the axis of mounting seat 11.

When the installation shell 21 is close to the installation seat 11, the limit block 31 slowly slides into the draw-in groove 111 along the end of the draw-in groove 111. When the installation shell 21 and the installation seat 11 are installed, the side wall of the limit block 31 is limited by the inner wall of the draw-in groove 111, and the installation shell 21 is stably installed on the installation seat 11. During use, the installation seat 11 and the installation shell 21 cannot rotate relative to the circumferential direction; The position limit reduces the bending of the needle tube 22 during the puncture process of the indwelling needle, thereby reducing the occurrence of the needle tube 22 piercing the blood vessel; at the same time, it also reduces the deflection of the inclined plane of the needle tube 22 during the puncture process, and improves the success rate of the indwelling needle puncture.

Referring to Fig. 4 and Fig. 5, the inside wall of the slot 111 is provided with a protrusion 1111. In this embodiment, the protrusion 1111 is an arc-shaped block, and the protrusion 1111 is integrally formed on the inner side wall of the slot 111. The block 1111 is inserted into the groove 311, and the inner wall of the groove 311 limits the movement of the protrusion 1111; when the protrusion 1111 needs to be moved out of the groove 311, the medical personnel need to use external force to pull the installation shell 21, and the limiting block 31 is deformed, and finally the protrusion 1111 is moved out of the groove 311.

Referring to Fig. 6 , when the medical personnel complete the needle insertion and need to withdraw the needle tube 22, the needle tube 22 can be automatically retracted into the installation shell 21 by the retraction assembly 24; 2. The spring 241 is sheathed on the end of the needle base 23 close to the mounting base 11, and is located in the retraction channel 216, that is, the spring 241 is located between the tail end of the needle base 23 and the inner end wall of the mounting shell 21 close to the mounting base 11;

6 and 7, the trigger member 242 includes a trigger block 2421, which is connected to the needle base 23 through a connecting rod, and there is a gap between the connecting rod and the outer wall of the needle base 23 in the original state; a trigger hole 211 is opened on the installation shell 21, and the trigger hole 211 communicates with the retraction channel 216, and the trigger hole 211 is integrally formed with a trigger support boss 2111 on the inner wall away from the mounting seat 11; in this embodiment, the trigger support boss 2111 The angle between the trigger block 2421 and the connecting rod is set to α, and α is an acute angle less than 90°.

When the trigger block 2421 protrudes from the retraction channel 216 and is inserted into the trigger hole 211 and is attached to the side wall of the trigger support boss 2111, the spring 241 is compressed by the inner side wall of the needle seat 23 and the installation shell 21, that is, the spring 241 is in a compressed state; assuming that the installation shell 21 is stationary, the compressed spring 241 has an elastic force that pushes the needle seat 23 away from the installation seat 11, and this elastic force makes the trigger block 2421 abut against the trigger support boss 2111 On the other hand, the elastic force cooperates with α less than 90° on the trigger support boss 2111 to increase the self-locking force of the trigger block 2421 .

Referring to Fig. 6 and Fig. 7, a trigger slide button 2422 is installed outside the installation shell 21 for sliding. The trigger slide button 2422 is clamped on the installation shell 21 through a curved plate. The trigger hole 211 is clearance fit; when the installation shell 21 is connected to the installation seat 11, the curved plate connected to the trigger slide button 2422 is against the end surface of the installation seat 11, and the trigger slide button 2422 cannot move.

After the medical staff completes the needle injection, the medical staff pushes the mounting base 11 to a position away from the mounting shell 21 by a distance equal to the length of the trigger support boss 2111. At this time, the end face of the mounting base 11 is far away from the curved plate connected to the trigger slide button 2422 to remove the restriction on the trigger slide button 2422; the medical staff first applies a thrust to the trigger slide button 2422 away from the direction of the trigger support boss 2111. When the trigger slide button 2422 loses the support force of the trigger support boss 2111, Press the trigger slide button 2422 again, and the trigger protrusion 2423 is inserted into the trigger hole 211 to press the trigger block 2421 downward, and the trigger block 2421 moves along the side wall guide of the trigger support boss 2111 toward the direction of the retraction channel 216 .

The inner wall of the installation shell 21 is provided with a friction ramp 212 and a sliding straight track 213 for the sliding of the trigger block 2421. The trigger hole 211, the friction ramp 212 and the sliding straight track 213 are sequentially arranged on the installation shell 21 and communicate with each other. When the block 2421 is located in the straight slide 213 , the connecting rod returns to its original state under its own deformation, and there is a gap between the trigger block 2421 and the inner sidewall of the straight slide 213 .

The slope of the friction ramp 212 causes frictional resistance to the movement of the trigger block 2421, slows down the thrust of the spring 241, and reduces the strength with which the needle holder 23 hits the bottom of the mounting shell 21;

6 and 8, when the trigger block 2421 is pressed by the trigger protrusion 2423, the trigger block 2421 is guided into the retraction channel 216 along the side wall of the trigger support boss 2111, and the trigger block 2421 loses the restriction of the trigger support boss 2111. Enter the sliding straight track 213 , at this time, driven by the trigger block 2421 , the needle base 23 moves in the direction away from the mounting base 11 in the retracting channel 216 , thereby retracting the exposed needle tube 22 into the retracting channel 216 .

6, the mounting shell 21 is provided with a limit ring 215 away from the end of the mounting seat 11, and the inner wall of the installation shell 21 at the limit stop ring 215 is provided with a limit ring groove 214.

A locking groove 231 is provided on the outer peripheral side wall of the end of the needle holder 23 far away from the mounting seat 11, and an inclined annular guide surface 232 is arranged on the outer peripheral side wall of the end of the needle holder 23 away from the installation seat 11. Moving in the ring groove 214, the center of the limit stop ring 215 gradually approaches the axis of the installation shell 21, and finally the limit stop ring 215 enters the lock groove 231 along the inclined annular guide surface 232, and again under the action of gravity, the center of the limit stop ring 215 is far away from the axis of the installation shell 21. The stop ring 215 restricts the movement of the needle base 23 towards the mounting seat 11, and the spring 241 is in the original state at this time.

The end of the needle base 23 away from the mounting base 11 is provided with a column groove 233, which communicates with the needle tube 22 installed in the needle base 23. A plunger 234 is inserted in the column groove 233. The plunger 234 is made of an air-permeable and liquid-impermeable material. In the blood observation area, the needle tube 22 is connected to the blood observation area; when the puncture reaches the desired position, the blood flows along the inner cavity of the needle tube 22 and enters the blood observation area. At this time, it is judged whether the indwelling needle is punctured in place according to whether there is blood in the blood observation area.

The implementation principle of Embodiment 1 is: when the installation shell 21 needs to be installed on the installation seat 11, the exposed needle tube 22 pierces the plastic bonnet 133, passes through the valve core sleeve 132, enters the conduit 12 through the rivet sleeve 131, and finally passes through the conduit 12; the limit block 31 is inserted into the slot 111, and the installation of the installation seat 11 and the installation shell 21 is completed.

When in use, the medical staff punctures the catheter 12 with the needle tube 22 into the skin of the patient. When the catheter 12 with the needle tube 22 moves into the blood vessel, the medical staff needs to withdraw the needle tube 22; The trigger slide button 2422 moves toward the mounting base 11. When the trigger slide button 2422 is not in contact with the trigger support boss 2111, the trigger slide button 2422 is pressed. The trigger protrusion 2423 is inserted into the trigger hole 211 and presses the trigger block 2421. The trigger block 2421 moves downward under the action of pressure. Road 212 moves and enters sliding straight path 213. At this time, under the action of trigger block 2421, needle holder 23 moves away from mounting seat 11 in retraction channel 216 to drive needle tube 22 to retract completely into retraction channel 216; The guard continues to use force to fix the position of the mounting base 11, and the arm holding the mounting shell 21 moves away from the mounting base 11, thereby completely separating the mounting shell 21 from the mounting base 11.

The deformability of the plastic bonnet 133 will close the end punctured by the needle tube 22. The medical personnel hold the installation shell 21 and move the installation shell 21 away from the installation seat 11 to completely separate the installation shell 21 from the installation seat 11; then the medical personnel insert the Luer connector into the valve slot 113 and push the plastic bonnet 133 to move in the valve slot 113. The inclined end surface 1321 of the valve core sleeve 132 pierces the plastic bonnet 133 And communicate with the Luer connector, so that the catheter 12 communicates with the infusion device or blood collection device connected with the Luer connector.

The medical personnel control the installation seat 11 to move forward a part, so that there is a gap between the installation seat 11 and the installation shell 21, so as to release the movement restriction of the trigger slide button 2422, first use the axial direction to move the trigger slide button 2422, and then press down the trigger slide button 2422. The two continuous forces here realize the automatic retraction of the needle tube 22, and use the elastic deformation of the plastic valve cap 133 to reduce the overflow of blood after the needle tube 22 retracts; The installation seat 11 and the installation shell 21 are stable in the circumferential direction during the assembly process, which ensures that the circumferential direction of the needle tube 22 and the catheter 12 is relatively fixed when the medical staff is puncturing, reduces the deflection of the inclined plane of the needle tube 22 during the puncture process, and improves the success rate of indwelling needle puncture.

Example 2

The difference between this embodiment and Embodiment 1 is that, referring to FIG. 9 and FIG. 10 , the section of the protrusion 1111 is an arc-shaped block, and the protrusion 1111 is covered with an arc-shaped elastic sleeve 1112. The elastic sleeve 1112 is made of silica gel. Opening 1113, the inner side wall of the groove 311 is provided with a pressing groove 3111, the groove 311 is located at the pressing groove 3111 to form a pressing bar 3112;

The implementation principle of Embodiment 2 is: when the mounting base 11 and the mounting shell 21 need to be separated, the medical staff uses an external force to pull the mounting shell 21 away from the mounting base 11. At this time, the limit block 31 is deformed, and the protrusion 1111 tends to move out of the groove 311; 11 During the process of gradually moving out from the groove 311, the elastic sleeve 1112 is gradually peeled off from the protrusion 1111 by the pressing bar 3112, and finally the protrusion 1111 is completely removed from the groove 311, and the elastic sleeve 1112 remains in the groove 311;

Example 3

The difference between this embodiment and Embodiment 1 is that, referring to FIG. 11 and FIG. 12 , the limit assembly 3 includes a limit connection arc plate 32 integrally formed on the end of the installation shell 21 close to the mounting seat 11. In this embodiment, there are two limit connection arc plates 32, and a gap for the threaded lug 116 to slide is reserved between the two limit connection arc plates 32; 11 exterior.

A limit connection groove 321 is provided on the inner sidewall of the limit connection arc plate 32, and a limit block 33 is slidably arranged in the limit connection groove 321. The limit block 33 slides along the radial direction of the limit connection arc plate 32. The limit block 33 is concave in cross section in this embodiment. The outer side wall of the limit connection arc plate 32 offers a limit connection hole 322, the limit connection hole 322 communicates with the limit connection groove 321, the limit connection hole 322 is a square hole, and the aperture of the limit connection hole 322 is less than the groove diameter of the limit connection groove 321.

A limit elastic piece 34 is arranged in the limit connecting hole 322. In this embodiment, the limit elastic piece 34 is a spring leaf. One end of the limit spring piece 34 passes through the limit connection hole 322 and enters the limit connection groove 321 to finally connect with the side wall of the limit block 33. 35 can move back and forth along the axial direction of the limit connecting arc plate 32; the distance between the bottom wall of the limit slip ring 35 and the outer peripheral wall of the mounting seat 11 is greater than or equal to the height of the threaded lug 116, in this embodiment, the distance between the bottom wall of the limit slip ring 35 and the outer peripheral wall of the mounting seat 11 is equal to the height of the threaded lug 116.

Limiting strip 323 is integrally formed on the outer side wall of the limiting connection arc plate 32, and limiting strip 323 can limit the sliding distance of the limiting slip ring 35 on the limiting connecting arc plate 32; the sidewall of the limiting slip ring 35 near the limiting strip 323 is provided with a slip groove 351, and the sliding groove 351 is provided with a special-shaped groove bottom. The side wall of 5 is provided with a plurality of protrusions 3231 , when the limiting bar 323 is inserted into the sliding groove 351 , the protrusions 3231 are attached to the bottom of the sliding groove 351 .

The outer wall of mounting base 11 is provided with the limit groove 112 that inserts for limit block 33, and limit block 33 is inserted in the limit groove 112 under the elastic action of limit spring 34, and the depth of limit groove 112 is less than the height of limit block 33; pull out.

The implementation principle of Embodiment 3 is: when the installation shell 21 needs to be connected with the installation seat 11, first move the limit connecting arc plate 32 to the direction of the installation seat 11, and gradually increase the contact area between the limit connection arc plate 32 and the installation seat 11. Provide a pulling force to move to the mounting seat 11, but because the outer peripheral side wall of the mounting seat 11 acts as a limiter to the limit block 33, the limit block 33 cannot move towards the direction of the mounting seat 11, so the limit spring piece 34 is partially bent in the limit connecting groove 321.

When the limit connection arc plate 32 is completely sleeved on the installation shell 21, the limit connection groove 321 is aligned with the limit groove 112, the limit block 33 loses the restriction of the outer peripheral side wall of the mounting seat 11, and the curved limit spring piece 34 applies a pulling force to the limit block 33 to make it break out of the limit connection groove 321, and the limit block 33 is smoothly inserted into the limit groove 112 under the action of the limit spring piece 34. At this time, a part of the limit block 33 is in the limit groove. 112, a part is in the limit connecting groove 321.

When the installation seat 11 and the installation shell 21 need to be separated, the medical personnel hold the installation shell 21 with their index fingers against the limit slip ring 35, and pull the limit slip ring 35 in a direction away from the mount seat 11. When the bottom of the sliding groove 351 fits together, the limit block 33 sticks to the bottom of the limit connecting groove 321, and the limit connecting arc plate 32 is also smoothly removed from the mounting seat 11 under the pulling force away from the mounting seat 11, thereby completing the separation of the mounting shell 21 and the mounting seat 11.

When the index finger of the medical staff touches the limit slip ring 35 and the arm exerts force to move the mounting shell 21 away from the mounting seat 11, the medical staff's thumb touches the trigger slide button 2422, and makes the moving direction of the thumb opposite to the moving direction of the arm.

Utilize the cooperation of the limit block 33 and the limit shrapnel 34, so that the mounting shell 21 and the mounting seat 11 cannot rotate in the circumferential direction during the connection process, and the connection is relatively stable; In addition, the mounting base 11 can be separated from the mounting shell 21. At the same time, the trigger slide button 2422 can be slid and pressed to trigger the retraction of the needle tube 22 by using the reverse movement of the thumb and the arm, that is, the relative movement of the fingers can be used to complete the unlocking and disassembly of the mounting base 11 and the mounting shell 21 and the retraction of the needle tube 22.

All of the above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims (10)

1. An automatic retraction type indwelling needle for preventing blood from overflowing comprises a catheter assembly (1) and a needle tube assembly (2) arranged on the catheter assembly (1); the method is characterized in that: the catheter assembly (1) comprises a mounting seat (11), a catheter (12) and an anti-backflow assembly (13), wherein the catheter (12) is mounted on the mounting seat (11), the anti-backflow assembly (13) is mounted in the mounting seat (11), and the anti-backflow assembly (13) is mounted at one end of the catheter (12);

The needle tube assembly (2) comprises a mounting shell (21), a needle tube (22), a needle seat (23) and a retraction assembly (24), wherein the needle tube (22) is connected with the needle seat (23), the needle seat (23) is slidably arranged in the mounting shell (21), one end of the needle tube (22) penetrates out of the mounting shell (21) to be inserted into the catheter (12), and the retraction assembly (24) is arranged on the needle seat (23) and controls the needle seat (23) to slide in the mounting shell (21) so as to retract the needle tube (22) into the mounting shell (21);

the mounting shell (21) is detachably connected with the mounting seat (11), a limiting assembly (3) is arranged on the mounting shell (21), and the limiting assembly (3) limits the mounting shell (21) to move circumferentially on the mounting seat (11).

2. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: the limiting assembly (3) comprises a plurality of limiting clamping blocks (31), the limiting clamping blocks (31) are mounted on the end wall of the mounting shell (21), a plurality of clamping grooves (111) are formed in the end wall, close to the mounting shell (21), of the mounting base (11), the number of the clamping grooves (111) is equal to the number of the limiting clamping blocks (31), and the limiting clamping blocks (31) are inserted into the clamping grooves (111).

3. The anti-blood-spill self-retracting indwelling needle according to claim 2, wherein: the limiting clamping block (31) is provided with a groove (311) towards the side wall of the axis direction of the mounting shell (21), the clamping groove (111) is communicated with the side wall of the mounting seat (11), the inner side wall of the clamping groove (111) is provided with a lug (1111), and the lug (1111) is inserted into the groove (311).

4. The anti-blood-spill self-retracting indwelling needle according to claim 3, wherein: the cross-section of lug (1111) is the arc piece, the cover is equipped with elastic sleeve (1112) on lug (1111), recess (311) inside wall is provided with supports tight strip (3112), tight breach (1113) have been seted up to the direction that elastic sleeve (1112) deviates from installation shell (21), elastic sleeve (1112) inserts simultaneously with lug (1111) and establishes to recess (311) in, support tight strip (3112) and insert and establish to in supporting tight breach (1113).

5. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: the limiting assembly (3) comprises a limiting connecting arc plate (32), a limiting block (33), a limiting elastic piece (34) and a limiting sliding ring (35), wherein the limiting connecting arc plate (32) is arranged at one end, close to the mounting seat (11), of the mounting shell (21), the limiting connecting arc plate (32) is sleeved on the mounting seat (11), a limiting connecting groove (321) is formed in the inner side wall of the limiting connecting arc plate (32), and the limiting block (33) is installed in the limiting connecting groove (321) in a sliding mode;

the outer side wall of the limit connecting arc plate (32) is provided with a limit connecting hole (322), the limit connecting hole (322) is communicated with a limit connecting groove (321), one end of the limit elastic piece (34) penetrates through the limit connecting hole (322) and is inserted into the limit connecting groove (321) to be connected with the limit block (33), the other end of the limit elastic piece (34) is connected with a limit sliding ring (35), and the limit sliding ring (35) is sleeved on the limit connecting arc plate (32) in a sliding manner;

A limiting groove (112) for inserting the limiting block (33) is formed in the outer side wall of the mounting seat (11).

6. The anti-blood-spill self-retracting indwelling needle according to claim 5, wherein: the limiting connecting arc plate (32) is provided with a limiting strip (323), and the limiting strip (323) limits the sliding distance of the limiting sliding ring (35) on the limiting connecting arc plate (32).

7. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: the anti-backflow component (13) is connected to one end of the guide pipe (12), the anti-backflow component (13) is installed in the installation seat (11), the anti-backflow component (13) comprises a rivet sleeve (131), a valve core sleeve (132) and a plastic valve cap (133), the rivet sleeve (131) is communicated with the end of the guide pipe (12) located in the installation seat (11), a valve slot (113) is formed in one end, close to the installation shell (21), of the installation seat (11), the valve core sleeve (132) is inserted into the valve slot (113) and is communicated with the rivet sleeve (131), the plastic valve cap (133) is sleeved at one end, far away from the rivet sleeve (131), of the valve core sleeve (132), and at least one of the plastic valve cap (133) and the valve core sleeve (132) is arranged in the valve slot (113) in a sliding mode along the axial direction of the valve slot (113).

The needle tube (22) penetrates through the plastic valve cap (133) and sequentially penetrates through the valve core sleeve (132), the rivet sleeve (131) and the guide tube (12).

8. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: the retraction assembly (24) is mounted on the mounting shell (21) to retract the needle tube (22) into the mounting shell (21); the retraction assembly (24) comprises a spring (241) and a trigger piece (242) for controlling the restoration of the spring (241), the spring (241) is sleeved on the needle seat (23), the spring (241) is positioned between the tail end of the needle seat (23) and the inner side end wall of the mounting shell (21), and the trigger piece (242) is mounted on the mounting shell (21) for controlling the restoration of the spring (241).

9. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: the trigger piece (242) comprises a trigger block (2421) connected with the needle seat (23) and a trigger slide button (2422) which is glidingly arranged on the mounting shell (21);

the trigger device is characterized in that a trigger hole (211) is formed in the installation shell (21), a friction ramp (212) and a sliding straight channel (213) for sliding of the trigger block (2421) are formed in the inner side wall of the installation shell (21), and the trigger hole (211), the friction ramp (212) and the sliding straight channel (213) are sequentially arranged on the installation shell (21) and are communicated with each other;

The trigger hole (211) inside wall is provided with trigger support boss (2111), trigger piece (2421) inserts in trigger hole (211) and pastes with the lateral wall that triggers support boss (2111), trigger one end of slide button (2422) is set up on trigger support boss (2111), be provided with on the diapire that is close to trigger hole (211) of trigger slide button (2422) and trigger protruding (2423).

10. The anti-blood-spill self-retracting indwelling needle according to claim 1, wherein: a limiting ring groove (214) is formed in the inner side wall of the mounting shell (21), a limiting baffle ring (215) is arranged in the limiting ring groove (214), the inner diameter of the limiting ring groove (214) is larger than the outer diameter of the limiting baffle ring (215), and the depth of the limiting ring groove (214) is larger than the ring width of the limiting baffle ring (215); a locking groove (231) for embedding the limit baffle ring (215) is formed in the outer peripheral side wall of one end, far away from the needle tube (22), of the needle seat (23).