Catheter indwelling infusion needle with thick and thin liquid passing side hole needle tube

Abstract

The utility model relates to a catheter indwelling infusion needle, in particular to a catheter indwelling infusion needle with a thick and thin needle tube with a liquid passing side hole, which is structurally characterized in that the liquid passing side hole is arranged on the peripheral surface of one end of a puncture needle tube close to a needle tip, and the liquid passing side hole is communicated with an inner cavity of the puncture needle tube and positioned in an inner cavity of a hose; the puncture needle tube is of a two-part structure with a thin front part and a thick rear part, the needle tip part is a small-diameter needle tube, the other part is a large-diameter needle tube, and the liquid passing side hole is formed in the circumferential surface of one end, close to the step part, of the large-diameter needle tube; a funnel-shaped cavity is formed in the middle of the hose seat, and when the needle seat drives the puncture needle tube to slide backwards in the sliding groove of the containing tube and is stopped by the stopping device, the liquid passing side hole and the step part are both located in front of the sealing piece and in the funnel-shaped cavity. The utility model has the advantages that on one hand, the time for medical staff to observe blood return is shortened, and the operation is quick and convenient; on the other hand, a liquid passing outlet channel is added, it is ensured that the infusion flow speed meets the specification, meanwhile, pain of a patient is prevented from being increased, and convenience of puncture operation is improved.

Description

Technical Field

[0001] The utility model relates to a catheter indwelling infusion needle, in particular to a catheter indwelling infusion needle with a thick and thin needle tube of a liquid passing side hole. Background Art

[0002] Existing tube needle and through-type indwelling infusion needle, refer to patent ZL2012800416834, as attached Figure 1 As shown, the indwelling infusion needle includes a puncture device 1 and a connecting tube assembly 2. The puncture device is a cannula puncture device, including a hose, a hose seat, a seal, a puncture needle tube, a needle seat and an operating handle. The puncture needle tube is sleeved in the inner cavity of the hose, and the needle tip is exposed at the conical tube puncture end of the front end of the hose; the connecting tube assembly is fixed to the tail of the operating handle, and its lumen is connected with the inner cavity of the needle tube and the inner cavity of the hose to form an infusion channel. During the puncture operation, after the puncture needle tube drives the hose to puncture, the puncture needle tube retreats and is hidden in the hose seat and is not removed from it. At the same time, it also serves as an infusion channel connecting the hose and the connecting tube, realizing the functions of direct infusion, combined puncture and indwelling as one.

[0003] However, the above technology has the following problems:

[0004] 1. The outer diameter of the puncture needle is usually one size smaller than the inner diameter of the hose, so that the end of the hose can be tapered to facilitate puncture. After the puncture is successful, the puncture needle is withdrawn into the hose seat. Figure 2 As shown, at this time, the infusion needs to pass through the inner cavity of the puncture needle tube before reaching the inner cavity of the hose. Since the puncture needle tube is smaller than the hose, the puncture needle tube outlet diameter is smaller than the hose outlet diameter. At this time, the infusion flow rate is constrained by the inner diameter of the puncture needle tube and cannot reach the flow rate of the specification (hose specification) of the catheter. Therefore, when the corresponding flow rate is required, a larger specification of hose indwelling infusion needle must be selected, and the needle tube will naturally increase. The patient's pain during puncture is also increased, and the puncture operation is more troublesome;

[0005] 2. After the puncture device punctures the blood vessel, in order to determine whether the needle tip has actually penetrated the blood vessel, it is necessary to wait for the blood to pass through the inner cavity of the needle tube and enter the inner cavity of the connecting tube to determine whether the puncture is successful. However, since there is a considerable distance from the needle tip to the inner cavity of the connecting tube, and before puncture, in order to test whether the puncture device is blocked, it is necessary to connect the infusion device and fill the inner cavity of the puncture needle tube with the drug solution from the connecting tube assembly to the puncture needle tube in sequence and until it flows out of the puncture needle tube, the infusion channel filled with drug solution further blocks the blood flow, and the time for observing blood return is greatly prolonged, which not only increases the pressure on patients waiting for puncture, but also makes it very inconvenient for medical staff to operate. Summary of the invention

[0006] The utility model aims to provide a catheter indwelling infusion needle with a thick and thin needle tube having a liquid-passing side hole, which can relieve the pain of patients and is easy to operate according to the shortcomings of the prior art.

[0007] The purpose of the utility model is achieved through the following ways:

[0008] A catheter indwelling infusion needle with a thick and thin needle tube with a liquid-passing side hole, comprising a puncture device and a connecting tube assembly, the puncture device comprising a hose, a hose seat fixedly connected to one end of the hose, a storage tube fixedly connected to the hose seat and having a sliding groove, a puncture needle tube and a needle seat with an operating handle, the puncture needle tube is sheathed in the inner cavity of the hose, the front end of the hose is a cone tube puncture end, the needle tip of the puncture needle tube passes through the cone tube puncture end and is exposed; one end of the puncture needle tube is fixedly connected to the needle seat, the needle seat is installed in the inner cavity of the storage tube, the operating handle crosses the sliding groove and is exposed outside the storage tube, and a back-stop device is provided at the rear end of the storage tube; the structural key points are:

[0009] A liquid-passing side hole is arranged on the peripheral surface of one end of the puncture needle tube near the needle tip, and the liquid-passing side hole is connected to the inner cavity of the puncture needle tube and is located in the inner cavity of the hose; the puncture needle tube is a two-part structure with a thin front and a thick back, wherein the needle tip part is a thin-diameter needle tube, and the rest is a thick-diameter needle tube, and the junction of the thin-diameter needle tube and the thick-diameter needle tube is a step portion, and the step portion and the rear portion of the thin-diameter needle tube are both located in the inner cavity of the conical tube puncture end of the hose, and the liquid-passing side hole is arranged on the peripheral surface of one end of the thick-diameter needle tube near the step portion; the hose seat is a columnar structure with a thin front and a thick back, including It comprises a thinner hose connection part, a thicker sealing installation part and a storage tube connection part. The inner cavity of the hose connection part and the inner cavity of the sealing installation part are connected by a slope transition. The slope part is a funnel-shaped cavity. The inner cavity of the sealing installation part and the funnel-shaped cavity intersect to form an L-shaped step surface. A sealing member is installed in the inner cavity of the sealing installation part on the L-shaped step surface. When the needle seat drives the puncture needle tube to slide backward in the sliding groove of the storage tube and is stopped by the stop device, the liquid-passing side hole and the step part are both located in front of the sealing member and in the funnel-shaped cavity.

[0010] During the operation, first, during puncture, the front end of the puncture needle and the hose enters the blood vessel first. At this time, the blood overflows from the side hole of the puncture needle through the inner cavity of the puncture needle and quickly spreads toward the needle seat along the gap between the puncture needle and the hose. Since the hose is made of transparent or translucent material, the medical staff can immediately see the spreading blood on the back half of the puncture needle and the hose that have not entered the blood vessel, so as to quickly determine whether the puncture is successful. Finally, the back half of the puncture needle and the hose are further pushed into the blood vessel to complete the puncture. In this way, the time for medical staff to observe the return of blood is greatly shortened, the operation can be faster and more convenient, and the mental stress of patients is greatly reduced.

[0011] Furthermore, in the hose seat, the funnel-shaped cavity is directly connected to the inner cavity of the hose via the inner cavity of the hose connection part. After the puncture is successful, when the needle seat drives the puncture needle tube to slide backward in the storage tube and is stopped by the stop device, the liquid-passing side hole is located just in front of the seal and in the funnel-shaped cavity, and an annular slit cavity is provided between the thin-diameter needle tube and the hose for easy circulation of the liquid medicine. At this time, the puncture needle tube portion after the liquid-passing side hole is compressed and sealed by the seal to prevent the liquid medicine from flowing back and overflowing, and the liquid-passing side hole can connect the inner cavity of the puncture needle tube and the funnel-shaped cavity, so that the liquid medicine can overflow from the liquid-passing side hole into the funnel-shaped cavity, and flow into the hose through the annular slit cavity through the funnel-shaped cavity, thereby adding a liquid-passing outlet outside the original needle tip of the puncture needle tube, thereby, part of the liquid medicine in the puncture needle tube flows to the inner cavity of the hose through the original needle tip, and the other part flows to the hose through the liquid-passing side hole and the funnel-shaped cavity, forming a double liquid-passing outlet channel. On this basis, the thin-diameter needle tube uses conventional usage specifications to ensure normal operation when puncturing the blood vessel, avoid increasing the patient's pain, and improve the convenience of the puncture operation; while the thick-diameter needle tube has a diameter one specification larger than the thin-diameter needle tube, plus a double-way liquid outlet channel to provide a sufficiently large diameter and outlet, so that the infusion flow rate is no longer restricted by the puncture needle tube diameter, which greatly improves the infusion flow rate and can fully reach the flow rate that the hose specifications should have.

[0012] The utility model can be further specified as follows:

[0013] The hose connection part of the hose seat is a rotary annular groove, and a ring-shaped convex clamp is arranged at the front end; the storage tube connection part is either a threaded connection part or a buckle connection part.

[0014] The rotary annular groove is used for installing the movable application wing; the storage tube connecting part is used for connecting the storage tube and matching the connecting structure at the front end of the storage tube, which can be threadedly connected or snap-connected.

[0015] When the storage tube connection portion is a snap connection portion, the inner cavity can accommodate the front end of the storage tube, and the outer peripheral surface is provided with a snap connection hole.

[0016] The receiving tube is a thin-walled tube, and the front end is a stepped structure. The outer peripheral surface of the stepped structure is either threaded or provided with a clamping protrusion.

[0017] The anti-retraction device of the storage tube is arranged at the rear end of the sliding groove, which is a stopping convex card. The stopping convex card is a structure that protrudes from one side to the other side in the sliding groove, and the sliding groove space behind the stopping convex card is a stopping groove.

[0018] The rear end of the retaining groove is either a closed end or a right-angle open groove. The right-angle open groove is a groove that first extends in the circumferential direction at the rear end of the retaining groove on one side of the retaining convex card and then turns at a right angle to the rear end surface of the storage tube.

[0019] The stop groove is a receiving hole groove for the needle seat to be withdrawn into place. When the rear end is an open groove, the stop convex card in the sliding groove can have a better elastic opening, which is convenient for the needle seat to slide on the one hand, and the stop convex card can extend to occupy more of the sliding groove width on the other hand, thereby providing a better stop effect. The side of the stop convex card facing the needle seat stop groove is a plane perpendicular to the extension direction of the sliding groove.

[0020] The needle seat includes a stepped rotating body and an operating handle, and the operating handle is connected to the stepped rotating body through a connecting rib; a needle insertion hole is provided in the middle of the stepped rotating body, and the needle insertion hole passes through the two end surfaces of the stepped rotating body, one end surface is fixedly connected to one end of the puncture needle tube, and the other end surface is fixedly connected to the connecting tube assembly for infusion.

[0021] In summary, the utility model provides a catheter indwelling infusion needle with a thick and thin needle tube with a liquid-passing side hole. The thick and thin needles are used and the liquid-passing side holes are set at the same time. On the one hand, the time for medical personnel to observe the blood return is shortened, and the operation is quick and convenient; on the other hand, the liquid outlet channel is increased to ensure that the infusion flow rate meets the specifications while avoiding increasing the patient's pain and improving the convenience of the puncture operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the existing indwelling infusion needle described in the background technology of the utility model;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure of the existing indwelling infusion needle when in use is shown;

[0024] Figure 3 It is a structural schematic diagram of the catheter indwelling infusion needle with a thick and thin needle tube with a liquid-passing side hole according to the utility model;

[0025] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of ;

[0026] Figure 5 It is a structural schematic diagram of the hose seat; Figure 6 for Figure 5 A schematic cross-sectional structure diagram of ;

[0027] Figure 7 It is a schematic diagram of the structure of the storage tube; Figure 8 It is a structural schematic diagram of the movable wing;

[0028] Fig. 9 It is a structural schematic diagram of the puncture needle tube and the needle seat;

[0029] Fig.10 It is a schematic diagram of the partial cross-sectional structure of the catheter with a thick and thin needle tube of the liquid-passing side hole after the indwelling infusion needle is withdrawn (facing the liquid-passing side hole); Fig.11 for Fig.10An enlarged structural schematic diagram of part A is shown;

[0030] Fig.12 It is a schematic diagram of the cross-sectional structure of the catheter with a thick and thin needle tube of the liquid-passing side hole after the indwelling infusion needle is withdrawn (facing away from the liquid-passing side hole).

[0031] Icon description: 1 trocar; 2 connecting tube assembly; 1.1 puncture needle tube; 1.1.1 thin-diameter needle tube; 1.1.2 thick-diameter needle tube; 1.1.3 side hole for liquid passage; 1.2 needle seat; 1.2.1 stepped rotating body; 1.2.2 connecting rib; 1.2.3 operating handle; 1.3 hose; 1.4 hose seat; 1.4.1 hose connection; 1.4.2 funnel-shaped cavity; 1.4.3 sealing installation 1.4.4 Receiver tube connection part; 1.4.5 Clamping hole; 1.5 Receiver tube; 1.5.1 Step structure for connecting hose seat; 1.5.2 Clamping protrusion; 1.5.3 Sliding groove; 1.5.4 Stopping protrusion; 1.5.5 Stopping groove; 1.5.6 Right-angle opening groove; 1.6 Sealing element; 1.7 Movable wing; 1.7.1 Ring tube; 1.7.2 Opening groove; 1.7.3 Wing.

[0032] The utility model is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0033] Refer to the attached Figure 3-12 A catheter indwelling infusion needle with a thick and thin needle tube with a liquid-passing side hole comprises a puncture device 1 and a connecting tube assembly 2. The puncture device 1 comprises a puncture needle tube 1.1, a needle seat 1.2 with an operating handle, a hose 1.3, a hose seat 1.4 fixedly connected to one end of the hose 1.3, and a storage tube 1.5 fixedly connected to the hose seat 1.4 and having a sliding groove.

[0034] like Fig. 9 As shown, the puncture needle tube 1.1 is inserted into the inner cavity of the hose 1.3, the front end of the hose 1.3 is the conical tube puncture end, and the needle tip of the puncture needle tube 1.1 passes through the conical tube puncture end and is exposed; a liquid-passing side hole 1.1.3 is arranged on the peripheral surface of one end of the puncture needle tube 1.1 close to the needle tip, and the liquid-passing side hole 1.1.3 is connected to the inner cavity of the puncture needle tube 1.1 and is located in the inner cavity of the hose 1.3 (before the puncture operation); the puncture needle tube 1. 1 is a two-part structure with a thin front and a thick back, wherein the needle tip part is a thin-diameter needle tube 1.1.1, and the rest part is a thick-diameter needle tube 1.1.2. The junction of the thin-diameter needle tube 1.1.1 and the thick-diameter needle tube 1.1.2 is a step portion, and the step portion and the rear portion of the thin-diameter needle tube 1.1.1 are both located in the inner cavity of the tapered tube puncture end of the hose 1.3, and the liquid-passing side hole 1.1.3 is provided on the circumference of one end of the thick-diameter needle tube 1.1.2 near the step portion.

[0035] The needle seat 1.2 includes a stepped rotating body 1.2.1 and an operating handle 1.2.3, and the operating handle 1.2.3 is connected to the stepped rotating body 1.2.1 through a connecting rib 1.2.2; a needle insertion hole is provided in the middle of the stepped rotating body 1.2.1, and the needle insertion hole passes through the two end surfaces of the stepped rotating body, one end surface is fixedly connected to one end of a thick-diameter needle tube 1.1.2, and the other end surface of the needle insertion hole is fixedly connected to the connecting tube assembly 2 for infusion.

[0036] like Figure 5-6 As shown, the hose seat 1.4 is a columnar structure that is thin at the front and thick at the back, including a thinner hose connecting part 1.4.1, a thicker sealing installation part 1.4.3 and a storage tube connecting part 1.4.4. The inner cavity of the hose connecting part 1.4.1 is used to consolidate the hose, and there is a slope transition connection between the inner cavity of the sealing installation part 1.4.3, and the inner cavity of the slope part is a funnel-shaped cavity 1.4.2. The inner cavity of the sealing installation part 1.4.3 intersects the funnel-shaped cavity 1.4.2 and forms an L-shaped step surface 1.4.6. A seal 1.6 is installed in the inner cavity of the sealing installation part 1.4.3 on the L-shaped step surface; the storage tube connecting part 1.4.4 is a snap-on connecting part, whose inner cavity can accommodate the stepped structure 1.5.1 at the front end of the storage tube 1.5, and a snap-on hole 1.4.5 is provided on the outer peripheral surface. The hose connection portion 1.4.1 of the hose seat 1.4 is a rotary annular groove, and a circular convex card is provided at the front end; the rotary annular groove is used to install the movable application wing 1.7, such as Figure 8 As shown, the movable application wing 1.7 is a fusion of an annular tube 1.7.1 with a certain length that can match the width of the annular groove on the hose seat 1.4, and a wing 1.7.3 that deviates from the axis of the annular tube 1.7.1; the rotary annular groove of the hose seat 1.4 is sleeved in the inner cavity of the annular tube 1.7.1, and four open grooves 1.7.2 are arranged on the circumferential surface of the annular tube. The open grooves 1.7.2 have a certain width and depth, are respectively distributed on the two end walls of the annular tube, and are staggered at 90 degrees, which are used for staggered installation of two movable application wings; the bottom surface of one of the wings 1.7.2 is flush with the outer circumferential surface of the annular tube 1.7.1, so that it can be laid flat on the patient's skin surface after puncture.

[0037] like Figure 7As shown, the front end of the storage tube 1.5 is a stepped structure 1.5.1 that is buckled with the storage tube connection part of the hose seat 1.4. A plurality of snap-fitting protrusions 1.5.2 are arranged on the outer circumference of the stepped structure 1.5.1. The snap-fitting protrusions 1.5.2 are adapted to the snap-fitting holes 1.4.5 on the hose seat. The stepped structure 1.5.1 is inserted into the inner cavity of the storage tube connection part of the hose seat 1.4 and rotated and adjusted until all the snap-fitting protrusions 1.5. 2 are all buckled into the snap-in hole 1.4.5; the storage tube 1.5 is a thin-walled tube, and the outer peripheral surface of the tube has a sliding groove 1.5.3 along the axial direction. The stop device of the storage tube is set at the rear end of the sliding groove 1.5.3, which is a stop convex card 1.5.4. The stop convex card 1.5.4 is a structure that protrudes from one side of the sliding groove 1.5.3 to the other side. The sliding groove space behind the stop convex card 1.5.4 is the stop groove 1.5.5. The rear end of the stop groove 1.5.5 is a right-angle opening groove 1.5.6, and the right-angle opening groove is a groove that first extends in the circumferential direction at the rear end of the stop groove on one side of the stop convex card, and then turns at a right angle to the rear end surface of the storage tube. The stepped rotating body 1.2.1 of the needle seat is installed in the inner cavity of the storage tube, and the operating handle 1.2.3 crosses the sliding groove 1.5.3 and is exposed outside the storage tube 1.5. At this time, the connecting rib 1.2.2 of the operating handle is located in the sliding groove 1.5.3.

[0038] In the puncture needle tube, the outer diameter specification of the thin-diameter needle tube 1.1.1 is the specification required by the conventional trocar, and the length is slightly longer than the length of the tapered puncture end of the hose. The thick-diameter needle tube 1.1.2 is a thin-walled needle tube with an outer diameter slightly smaller than the inner diameter of the selected hose. The inner cavity channel of the thick-diameter needle tube 1.1.2 is much larger than the inner cavity channel of the thin-diameter needle tube 1.1.1. The liquid-passing side hole 1.1.3 is opened at the junction of the thick-diameter needle tube and the thin-diameter needle tube and on the side of the thick-diameter needle tube. The liquid-passing side hole 1.1.3 is connected to the inner cavity channel of the thick-diameter needle tube and can be holes of various shapes.

[0039] Reference Figure 4 , 10-12. Before using the infusion needle, first connect it to the infusion set filled with liquid medicine to test whether the catheter indwelling infusion needle is blocked. After completion, when the needle tip of the puncture device 1 and the tip of the hose puncture into the patient's blood vessel, the blood passes through the inner cavity channel of the thin-diameter needle tube 1.1.1, first quickly overflows from the liquid-passing side hole 1.1.3, and enters the annular gap between the outer wall of the thick-diameter needle tube 1.1.3 and the inner cavity wall of the hose 1.3. The blood return can be seen from the transparent catheter soon. The blood return speed is much faster, which greatly reduces the waiting time of medical staff and also reduces the anxiety of patients while waiting. After the puncture and catheterization are successfully completed, the puncture needle tube is withdrawn, and the operating handle 1.2.3 is withdrawn along the sliding groove 1.5.3 of the storage tube until the connecting rib 1.2.2 passes over the stop convex card 1.5.4 and stops in the stop groove 1.5.5 on the storage tube 1.5. At this time, the front part of the puncture needle tube retreats into the funnel-shaped cavity 1.4.2 of the hose seat, wherein the thin-diameter needle tube 1.1.1 is located in the rear inner cavity of the hose, and the step part where the thick and thin needle tubes meet is located in the funnel-shaped cavity 1.4.2. At the same time, the liquid-passing side hole 1.1.3 is just in front of the end surface of the sealing member 1.6, and is also located in the funnel-shaped cavity 1.4.2. During infusion, the drug solution passes through the inner cavity of the connecting tube, through the inner cavity channel of the thick-diameter needle tube 1.1.3, and part of the drug solution directly enters the inner cavity of the soft tube through the inner cavity channel of the thin-diameter needle tube 1.1.1, while the rest of the drug solution flows out through the liquid-passing side hole 1.1.3, and converges into the inner cavity of the soft tube in front of the thin-diameter needle tube 1.1.1 through the annular gap between the thin-diameter needle tube 1.1.1 and the soft tube 1.3. This allows a much larger amount of liquid to pass through the inner cavity of the thin needle tube than the existing single method, and gives full play to the flow rate performance that the soft tube of corresponding specifications should have.

[0040] The parts not described in the present invention are the same as those in the prior art.

Claims

1. A catheter indwelling infusion needle with a thick and thin needle tube with a side hole for liquid passage, comprising a puncture device and a connecting tube assembly, the puncture device comprising a hose, a hose seat fixedly connected to one end of the hose, a storage tube fixedly connected to the hose seat and having a sliding groove, a puncture needle tube and a needle seat with an operating handle, the puncture needle tube is sheathed in the inner cavity of the hose, the front end of the hose is the puncture end of the cone tube, the needle tip of the puncture needle tube passes through the puncture end of the cone tube and is exposed; one end of the puncture needle tube is fixedly connected to the needle seat, the needle seat is installed in the inner cavity of the storage tube, the operating handle crosses the sliding groove and is exposed outside the storage tube, and a backstop device is provided at the rear end of the storage tube; characterized in that: A liquid-passing side hole is arranged on the peripheral surface of one end of the puncture needle tube near the needle tip, and the liquid-passing side hole is connected to the inner cavity of the puncture needle tube and is located in the inner cavity of the hose; the puncture needle tube is a two-part structure with a thin front and a thick back, wherein the needle tip part is a thin-diameter needle tube, and the rest is a thick-diameter needle tube, and the junction of the thin-diameter needle tube and the thick-diameter needle tube is a step portion, and the step portion and the rear portion of the thin-diameter needle tube are both located in the inner cavity of the conical tube puncture end of the hose, and the liquid-passing side hole is arranged on the peripheral surface of one end of the thick-diameter needle tube near the step portion; the hose seat is a columnar structure with a thin front and a thick back, including It comprises a thinner hose connection part, a thicker sealing installation part and a storage tube connection part. The inner cavity of the hose connection part and the inner cavity of the sealing installation part are connected by a slope transition. The slope part is a funnel-shaped cavity. The inner cavity of the sealing installation part and the funnel-shaped cavity intersect to form an L-shaped step surface. A sealing member is installed in the inner cavity of the sealing installation part on the L-shaped step surface. When the needle seat drives the puncture needle tube to slide backward in the sliding groove of the storage tube and is stopped by the stop device, the liquid-passing side hole and the step part are both located in front of the sealing member and in the funnel-shaped cavity.

2. A catheter indwelling infusion needle with a thick and thin needle tube with a side hole for liquid passage according to claim 1, characterized in that: The hose connection part of the hose seat is a rotary annular groove, and a ring-shaped convex clamp is arranged at the front end; the storage tube connection part is either a threaded connection part or a buckle connection part.

3. A catheter indwelling infusion needle with a thick and thin needle tube with a side hole for liquid passage according to claim 1, characterized in that: The receiving tube is a thin-walled tube, and the front end is a stepped structure. The outer peripheral surface of the stepped structure is either threaded or provided with a clamping protrusion.

4. The catheter indwelling infusion needle with a thick and thin needle tube with a side hole for liquid passage according to claim 1, characterized in that: The anti-retraction device of the storage tube is arranged at the rear end of the sliding groove, which is a stopping convex card. The stopping convex card is a structure that protrudes from one side to the other side in the sliding groove, and the sliding groove space behind the stopping convex card is a stopping groove.

5. The catheter indwelling infusion needle with a thick and thin needle tube with a side hole for liquid passage according to claim 1, characterized in that: The needle seat includes a stepped rotating body and an operating handle, and the operating handle is connected to the stepped rotating body through a connecting rib; a needle insertion hole is provided in the middle of the stepped rotating body, and the needle insertion hole passes through the two end surfaces of the stepped rotating body, one end surface is fixedly connected to one end of the puncture needle tube, and the other end surface is fixedly connected to the connecting tube assembly for infusion.

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