An indwelling needle suitable for one-handed needle operation

Abstract

This invention discloses an indwelling needle suitable for one-handed needle insertion. The indwelling needle comprises an outer sheath and a puncture needle, the puncture needle penetrating the outer sheath with its tip longer than the sheath for puncture. The indwelling needle has a needle seat with a hollow central structure, consisting of a first needle seat connecting to the outer sheath and a second needle seat connecting to the puncture needle. The needle seat has a handle for securing both components, such as a locking structure composed of an upper and lower rubbing plate. The upper rubbing plate has a limiting groove that engages with a limiting component on the lower rubbing plate, and a stop block to facilitate thumb application. The cavity of the second needle seat contains an elastic component to assist needle withdrawal, such as a spring-connected safety plug. The first needle seat has an infusion connector, and the outer wall of the connecting section of the second needle seat or the inner wall of the first needle seat cavity has anti-slip textures or protrusions. This indwelling needle facilitates one-handed needle insertion and offers high safety.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and relates to an indwelling needle, and more particularly to an indwelling needle suitable for one-handed needle operation. Background Technology

[0002] An indwelling intravenous catheter, also known as an intravenous cannula, consists primarily of a flexible outer cannula / cannulas that can be left in a blood vessel, and a stainless steel guide needle. During use, the outer cannula and guide needle are inserted together into the blood vessel. Once the entire outer cannula is inside the vessel, the guide needle is withdrawn, leaving only the flexible outer cannula in place for intravenous infusion. During withdrawal, one hand holds the cannula seat while the other hand retracts the needle seat along with the needle, leaving only the flexible outer cannula in the blood vessel.

[0003] Currently, the withdrawal of the steel needle requires the simultaneous operation of both hands. However, when medical staff insert the needle into a patient, they need to support the patient's arm with one hand and insert the needle with the other. Since the withdrawal of the needle requires the operation of both hands, they have to abandon the support of the arm and withdraw the needle with both hands. On the one hand, the physiological tremors of the medical staff's hands will lead to unstable needle withdrawal, which will increase the patient's pain to some extent. On the other hand, the patient's movement of the arm will also lead to needle withdrawal errors, resulting in the risk of puncture failure. Furthermore, the tip of the guide needle core is exposed after being pulled out, and the medical staff performing the operation may be pricked by the needle tip, resulting in needle-related occupational exposure.

[0004] Chinese patent CN118454009A discloses a self-retracting anti-puncture indwelling needle structure. This structure achieves automatic needle retraction through the design of a sliding needle seat and a needle retraction tube. Since the retracted needle is placed inside the needle retraction tube, it can effectively avoid needlestick injuries and mitigate occupational exposure risks. However, during operation, the device still requires two hands (after puncture, one hand holds the outer tube seat while the other hand rotates the needle handle (rotating sleeve) to the opposite side) before self-retraction. Therefore, there is still a risk of puncture due to patient movement during needle retraction. Furthermore, the needle retraction method of this device is achieved by the entry of outside air into the negative pressure zone, using the pressure difference to push the sliding needle seat backward. In order to form a negative pressure zone, the needle retraction tube and the outer tube seat of this structure must be sealed in a low-pressure environment to form a negative pressure zone. Therefore, there are strict requirements for the manufacturing workshop. Moreover, during transportation, the device is prone to accidental contact with the needle handle, causing the rotating sleeve to rotate and connect to the air vent, resulting in waste of the instrument due to automatic needle retraction.

[0005] Furthermore, existing clamps use a single-point blocking method to cut the tube, achieving severance through a narrow cross-section. Excessive clamping force can lead to over-compression of the extension tube, causing narrowing or even closure of the lumen, affecting subsequent infusion flow or damaging the lumen. Insufficient force may result in incomplete closure, leading to blood backflow or leakage. Some clamps are also not suitable for single-handed operation, requiring two hands to close or open, causing inconvenience and reducing efficiency for medical staff in emergencies or when space is limited. Clamps with simple snap-fit ​​or clamping mechanisms to secure the extension tube have stability issues. During patient movement or care, they are easily affected by external forces such as pulling or impacts, causing the clamps to loosen, shift, or even fall off. This not only causes the clamp to lose control of the extension tube but may also cause displacement or dislodgement of the indwelling needle, increasing patient discomfort and infection risks. Summary of the Invention

[0006] Based on the aforementioned problems with indwelling needles and their clamps, one objective of this application is to provide an indwelling needle that is easy to operate with one hand. This indwelling needle has the function of single-handed needle insertion and withdrawal, and also has a needle tip protection structure. Another objective of this application is to provide a clamp structure that can be clamped with one hand and also improves stability. By clamping a section, the extension tube is cut off to prevent blood backflow, and the problems of easy clamping and difficulty in controlling the clamping force are solved. The specific technical solution is as follows:

[0007] Firstly, this application provides an indwelling needle suitable for one-handed needle operation, which can be manufactured in a conventional workshop as follows:

[0008] An indwelling needle suitable for one-handed needle operation, the indwelling needle includes an outer tube and a puncture needle, the puncture needle penetrates the outer tube and the needle tip is longer than the outer tube for puncture, the indwelling needle is also provided with a needle seat and a clamp provided on the extension tube of the indwelling needle for preventing backflow of blood;

[0009] The needle hub has a hollow structure in the middle, including a first needle hub and a second needle hub, and the first needle hub and the second needle hub are respectively connected to an outer tube and a puncture needle;

[0010] The needle holder is also provided with a handle for fixing the first needle holder and the second needle holder;

[0011] The cavity of the second needle holder is also provided with an elastic component to assist in needle withdrawal;

[0012] The clamp includes a clamp body and clamping arms disposed on the clamp body for clamping the extension tube inside the cavity and a release plate for releasing the clamping arms.

[0013] Furthermore, the handheld part includes an upper rubbing plate connected to the first needle seat and a lower rubbing plate connected to the second needle seat, and the upper rubbing plate and the lower rubbing plate are engaged and fixed together.

[0014] Furthermore, the upper rubbing plate is provided with a semi-circular arc-shaped limiting groove for engaging with the limiting member provided on the lower rubbing plate.

[0015] Furthermore, the limiting member is a semi-cylinder connected to the lower rubbing plate via an extension plate, and the volume of the semi-cylinder is adapted to the limiting groove.

[0016] Furthermore, the upper rubbing plate is also equipped with a stop block to facilitate the force of rubbing with the thumb.

[0017] Furthermore, the stop is an arc-shaped stop with its opening facing the tail end of the needle seat.

[0018] Furthermore, the elastic component is a spring, with one end of the spring fixedly connected to the cavity of the second needle holder, and the other end provided with a safety plug for wrapping the needle tip after the needle is withdrawn.

[0019] Furthermore, the safety plug is a cylindrical, spherical, or bowl-shaped plug made of any one of the following materials: medical-grade butyl rubber, silicone rubber, thermoplastic elastomer (TPE), polytetrafluoroethylene (PTFE), and silicone.

[0020] Furthermore, the first needle hub is also provided with an infusion connector for connecting to the infusion tubing.

[0021] Furthermore, the outer wall of the connecting section of the second needle holder or the inner wall of the inner cavity of the first needle holder is provided with anti-slip textures or anti-slip protrusions.

[0022] Furthermore, the inner surface of the clamp arm of the clamp is provided with a pressing head for protrusion, and the head end of the clamp arm is also provided with a fixing arm that engages with the locking groove to fix the clamp arm.

[0023] The loosening plate is provided with a pressing element for ejecting the head end of the fixed arm that is engaged in the locking groove.

[0024] The working principle of this utility model is as follows: An indwelling needle suitable for single-handed needle operation. When medical staff use the puncture needle (2) of this device to complete the puncture and withdraw the needle, the device can achieve the needle withdrawal operation with one hand. The specific operation is as follows:

[0025] During the puncture stage: The medical staff holds the indwelling needle with one hand and holds the needle seat (3) stably through the combination structure of the upper rubbing plate (311) and the lower rubbing plate (321). (At this time, the puncture needle (2) is fixed inside the outer tube (1). The semi-circular limiting groove (311a) on the upper rubbing plate (311) and the semi-cylindrical limiting piece (322) on the lower rubbing plate (321) are engaged to fix the relative positions of the first needle seat (31) and the second needle seat (32), and the spring is compressed inside the cavity of the first needle seat (31). Since the puncture needle (2) penetrates the outer tube (1) and the needle tip is longer than the outer tube (1), during puncture, the puncture needle (2) together with the outer tube (1) is inserted into the patient's blood vessel. During this process, the upper surface of the upper rubbing plate (311) and the lower surface of the lower rubbing plate (321) of the first hand are provided with anti-slip texture, which can increase the friction between the medical staff's hand and the needle seat (3), prevent the needle seat (3) from slipping during the puncture process, and ensure the stability of the puncture operation.

[0026] Needle withdrawal stage: After puncture, the puncture needle (2) needs to be withdrawn. Since the cavity of the second needle holder (32) is equipped with an elastic component (4) (such as a spring), when the medical staff begins to withdraw the needle, the operator operates with the thumb and index finger. The tip of the thumb presses against the arc-shaped stop (311b), and the hand is rubbed open by the thumb forward and the index finger backward, pushing out the limiting piece (322) located in the limiting groove (311a), releasing the spring. The elastic force of the spring acts on the puncture needle (2), assisting the medical staff in withdrawing the puncture needle (2) from the outer tube (1). As the puncture needle (2) is withdrawn, the safety plug (5) connected to the other end of the spring gradually approaches the needle tip of the puncture needle (2). After the puncture needle (2) is completely withdrawn, the safety plug (5) covers the needle tip, preventing the medical staff from being accidentally punctured, improving the safety of use, and fixing the outer tube (1) seat by applying a patch.

[0027] Infusion stage: The first needle seat (31) is provided with an infusion connector (312) connected to the infusion extension tube (9). After the puncture needle (2) is withdrawn, the infusion tube can be connected to the Y tube (8) at the end of the extension tube (9) connected to the infusion connector (312) to perform the infusion operation and complete the entire indwelling needle usage process. After the infusion is completed, the clamp arm (71) of the clamp (7) is pressed first, and the clamping head (711) provided on the clamp arm (71) is used to clamp the extension tube (9) that passes through the tube cavity (733) of the clamp (7) to block the infusion. Then the needle is removed and the tube is sealed. When the infusion is performed again, the infusion tube is connected to the loose clamp plate (72) by squeezing the left and right clamps (7). The pressing part (721) provided on the loose clamp plate (72) pushes out the head end of the fixed arm (712) that is locked in the locking groove (731) and opens the clamp to restore the flow.

[0028] Compared with the prior art, the beneficial effects of this utility model are: it enables one-handed needle operation, and the needle tip is wrapped with a safety plug after the needle is withdrawn, which can prevent the occurrence of needle injury incidents. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the assembled structure of this utility model;

[0031] Figure 3 This is a cross-sectional view of the present invention;

[0032] Figure 4 This is a schematic diagram illustrating the use of this utility model;

[0033] Figure 5 This is a schematic diagram of the needle insertion of this utility model;

[0034] Figure 6 This is a schematic diagram of the needle retraction of this utility model;

[0035] Figure 7 This is the first state of needle retraction in this utility model;

[0036] Figure 8 This is the second state of needle retraction in this utility model;

[0037] Figure 9 This is a schematic diagram of the overall structure of the indwelling needle of this utility model;

[0038] Figure 10 An exploded view of the clamp for the indwelling needle of this utility model;

[0039] Figure 11 This is a schematic diagram showing the clamping state of the indwelling needle clamp of this utility model;

[0040] Figure 12 This is a schematic diagram showing the open state of the clamp of the indwelling needle of this utility model;

[0041] Figure 13 This is a cross-sectional view of the indwelling needle clip of this utility model in its open state;

[0042] Figure 14 This is a cross-sectional view of the clamped state of the indwelling needle of this utility model;

[0043] Figure 15 This is a vertical sectional view of the clamped state of the indwelling needle of this utility model;

[0044] Figure 16 This is a schematic diagram showing the force required to open the clamp of the indwelling needle of this utility model;

[0045] Figure 17 This is a vertical sectional view of the indwelling needle clip of this utility model in its open state;

[0046] In the diagram, 1-outer tube; 2-puncture needle; 3-needle seat; 31-first needle seat; 311-upper rubbing plate; 311a-limiting groove; 311b-stop block; 312-infusion connector; 32-second needle seat; 321-lower rubbing plate; 322-limiting component; 4-elastic component; 5-safety plug; 6-"U" shaped fixing groove; 7-clamp; 71-clamp arm; 711-pressing head; 712-fixing arm; 72-loosening clamp; 721-pressing component; 722-mounting block; 73-clamp body; 731-locking groove; 732-pressing groove; 733-lumen; 8-Y tube; 9-extension tube; 10-skin layer. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0048] Example 1: An indwelling needle suitable for one-handed needle operation, the device includes an outer tube 1, a puncture needle 2 and a needle seat 3, and also includes a clip 7 sleeved on the extension tube 9 of the indwelling needle;

[0049] The outer tube 1 is a soft outer tube that can be left in a blood vessel. A puncture needle 2 with a length slightly larger than the outer tube 1 is disposed inside the outer tube 1. One end of the outer tube 1 and the puncture needle 2 are both connected to the needle hub 3. The needle hub 3 includes a first needle hub 31 and a second needle hub 32. The second needle hub 32 is disposed at the tail end of the first needle hub 31. The first needle hub 31 and the second needle hub 32 are also provided with a handle for fixing the first needle hub 31 and the second needle hub 32. The handle includes an upper rubbing plate 311 connected to the first needle hub 31 and a lower rubbing plate 321 connected to the second needle hub 32. The upper rubbing plate 311 is provided with a limiting groove 311a for engaging with the upper limit block of the lower rubbing plate 321. The top edge of the upper rubbing plate 311 is provided with an arc-shaped stop block 311b adapted to the thumb. The limiting groove 311a is a semi-circular arc groove placed horizontally on the first needle hub 31. The size of the groove is adapted to the limiting block.

[0050] The middle part of the needle seat 3 is a hollow structure. The second needle seat 32 and the first needle seat 31 are connected by a connecting section of the second needle seat 32. The connecting section of the second needle seat 32 and the fixed end of the second needle seat 32 form a convex frustum. The outer diameter of the connecting section is interference-fitted with the second needle seat 32 (in combination with easy disassembly design, the connecting parts are made of a material with a certain elasticity. Based on the interference fit, the elastic deformation of the material is used to achieve relatively easy opening and closing). Anti-slip textures or protrusions are provided on the outer wall of the connecting section of the second needle seat 32 or the inner wall of the inner cavity of the first needle seat 31.

[0051] The puncture needle 2 is disposed in the cavity of the second needle seat 32, with one end fixedly connected to the second needle seat 32. An elastic component 4 for assisting needle withdrawal is disposed on the outer periphery of the puncture needle 2. A safety plug 5 is disposed at the front end of the elastic component 4. The outer tube 1 is disposed at the front end of the first needle seat 31. The puncture needle 2 passes through the outer tube 1 to the needle tip, extending out of the end of the outer tube 1 for puncture and inserting the outer tube 1 into the blood vessel. The elastic component 4 is a spring, and the safety plug 5 connected to one end of the spring is a cylindrical, spherical, or bowl-shaped plug that can rebound to its original shape after being passed through by the puncture needle 2. The plug is made of any material such as medical grade butyl rubber, silicone rubber, thermoplastic elastomer (TPE), polytetrafluoroethylene (PTFE), and silicone. The plug can quickly return to its original shape after the needle is punctured. When the spring is compressed, the safety plug 5 is placed in the "U"-shaped fixing groove 3 in the first needle seat 31.

[0052] like Figure 9-17 As shown, the clamp 7 includes a clamp body 73, clamping arms 71 disposed on the clamp body 73, and a release plate 72 for releasing the clamping arms 71; the middle part of the clamp body 73 is a cavity 733 for accommodating the extension tube 9, and one end of the clamp body 73 is connected to the upper and lower surfaces of the clamp body 73 by a pin, and the contact surface between the clamping arms 71 and the extension tube 9 is provided with at least one clamping head 711 for clamping the extension tube 9. The clamping heads 711 are combined into a wave-shaped clamping surface; the head end of the clamping arm 71 is provided with a fixing arm 712 that is connected to the locking groove 731 at the head end of the clamp body 73 for locking the extension tube 9. When the outer end face of the clamping arm 71 is subjected to force, the fixing arm 712 moves forward in the direction of the force until the head end of the fixing arm 712 enters the locking groove 731 and locks. At this time, the clamping heads 711 of the two clamping arms 71 are directly facing the clamping extension tube 9 to achieve blocking closure and prevent backflow of blood after the infusion is completed.

[0053] The release plate 72 of the clamp 7 consists of two panels with semi-circular protrusion pressing elements 721. The semi-circular protrusions of the pressing elements 721 are provided with mounting blocks 722 for installing the release plate 72. The mounting blocks 722 are engaged in the pressing groove 732 of the clamp body 73 for installing the release plate 72. In use, pressing the release plate 72 causes it to move forward in the pressing groove 732, pushing out the head end of the fixing arm 712, which is engaged in the locking groove 731 at the front end of the pressing groove 732, so that the fixing arm moves upward to release the extension tube and restore flow for infusion. The head end of the fixing arm moves upward into the anti-dislodgement groove 734.

[0054] The general steps for using this device are as follows:

[0055] 1. Remove the disposable safety sticker, take off the needle cap, and prepare for operation;

[0056] 2. Locate the vein, support the patient's arm with one hand, and hold the needle handle consisting of the upper and lower rubbing plates 311 with the other hand. Perform accurate puncture (e.g., Figure 4 , Figure 5 );

[0057] 3. Combining Figure 6 and 7 As shown, after the puncture is completed, the hand holding the needle handle uses the thumb and index finger in coordination. The thumb presses against the top block of the upper rubbing plate 311 and exerts force forward, while the index finger exerts force backward to separate the upper rubbing plate 311 and the lower rubbing plate 321 and simultaneously pushes the outer cannula 1 into the blood vessel with the help of the pushing force.

[0058] 4. For example Figure 6 and 7 As shown, as the lower rubbing plate 321 is pushed, the limiting block on the lower rubbing plate 321 disengages from the limiting groove 311a on the upper rubbing plate 311. The puncture needle 2 seat moves slowly backward under the action of the spring, and moves together with the steel needle to complete the needle withdrawal. Due to the silicone structure inside the plug, the puncture needle 2 can be withdrawn stably and slowly, and the plug can quickly return to its original shape to wrap the needle tip after the needle is withdrawn.

[0059] 5. For example Figure 8 As shown, after the steel needle is completely withdrawn, the needle tip is placed inside the plug at the front end of the spring to avoid pricking medical staff during placement.

[0060] 6. Apply and fix one outer tube as per traditional methods for infusion;

[0061] 7. After the infusion is finished, first press the outer surface of the clamp arm 71 of the clamp 7 up and down to lock the extension tube and stop the infusion. Then pull out the infusion tube connected to the end of the Y tube and seal the tube.

[0062] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A needle for single-handed needle handling, comprising an outer cannula (1) and a puncture needle (2) which penetrates the outer cannula (1) and has a needle tip which is longer than the outer cannula (1) for puncturing, characterized in that The indwelling needle is also provided with a needle hub (3) and a clamp (7) on the indwelling needle extension tube (9) to prevent backflow of blood. The needle hub (3) has a hollow structure in the middle, including a first needle hub (31) and a second needle hub (32). The first needle hub (31) and the second needle hub (32) are respectively connected to an outer tube (1) and a puncture needle (2). The needle holder (3) is also provided with a hand-held part for fixing the first needle holder (31) and the second needle holder (32); The cavity of the second needle holder (32) is also provided with an elastic component (4) to assist in needle withdrawal; The clamp (7) includes a clamp body (73) and a clamp arm (71) provided on the clamp body (73) for clamping the extension tube inside the tube cavity (733) and a release plate (72) for releasing the clamp arm (71).

2. The indwelling needle suitable for one-handed needle operation according to claim 1, characterized in that, The handheld part includes an upper rubbing plate (311) connected to the first needle holder (31) and a lower rubbing plate (321) connected to the second needle holder (32), and the upper rubbing plate (311) and the lower rubbing plate (321) are engaged and fixed together.

3. An indwelling needle suitable for one-handed needle operation according to claim 2, characterized in that, The upper rubbing plate (311) is provided with a semi-circular arc-shaped limiting groove (311a) for engaging with the limiting member (322) provided on the lower rubbing plate (321), and a stop block (311b) is also provided at the top of the upper rubbing plate (311) to facilitate the force of the thumb rubbing.

4. An indwelling needle suitable for one-handed needle operation according to claim 3, characterized in that, The limiting member (322) is a semi-cylinder connected to the lower rubbing plate (321) via an extension plate, and the volume of the semi-cylinder is adapted to the limiting groove (311a).

5. An indwelling needle suitable for one-handed needle operation according to claim 3, characterized in that, The stop (311b) is an arc-shaped stop (311b) with its opening facing the tail end of the needle seat (3).

6. An indwelling needle suitable for one-handed needle operation according to claim 1, characterized in that, The elastic component (4) is a spring. One end of the spring is fixedly connected to the cavity of the second needle holder (32), and the other end is provided with a safety plug (5) for wrapping the needle tip after the needle is withdrawn.

7. An indwelling needle suitable for one-handed needle operation according to claim 6, characterized in that, The safety plug (5) is a cylindrical, spherical, or bowl-shaped plug made of any of the following materials: medical-grade butyl rubber, silicone rubber, thermoplastic elastomer (TPE), polytetrafluoroethylene (PTFE), and silicone.

8. An indwelling needle suitable for one-handed needle operation according to claim 1, characterized in that, The first needle hub (31) is also provided with an infusion connector (312) that is connected to the extension tube (9).

9. An indwelling needle suitable for one-handed needle operation according to claim 1, characterized in that, The outer wall of the connecting section of the second needle seat (32) or the inner wall of the inner cavity of the first needle seat (31) is provided with anti-slip texture or anti-slip protrusion.

10. An indwelling needle suitable for one-handed needle operation according to claim 1, characterized in that, The inner surface of the clamp arm (71) of the clamp (7) is provided with a pressing head (711) for protrusion, and the head end of the clamp arm (71) is also provided with a fixing arm (712) that engages with the locking groove (731) to fix the clamp arm (71). The loosening plate (72) is provided with a pressing member (721) for ejecting the head end of the fixing arm (712) that is engaged in the locking groove (731).

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