A safe hemodialysis indwelling needle

Abstract

The present invention discloses a safe hemodialysis indwelling needle, including a hemodialysis needle tube assembly, a catheter assembly and a needle tip shielding assembly. The needle tip shielding assembly is provided with a needle cavity, a needle passage and a limiting mechanism for limiting the needle in the needle cavity to prevent the hemodialysis needle tube needle tip from being pulled off the needle tip shielding assembly. A magnet cavity is also provided in the needle passage, and a first fixed magnet and a movable magnet are provided in the magnet cavity. In the initial state, the movable magnet is outside the needle passage. In the protection state, the attraction between the first fixed magnet and the movable magnet is used to make the movable magnet in the needle passage to seal the hemodialysis needle tube needle tip in the needle cavity, thereby shielding the needle tip and preventing the needle from stabbing people during garbage disposal or recycling, causing injuries and secondary cross infection.

Description

Technical Field

[0001] The invention relates to a medical product, in particular to a safe hemodialysis indwelling needle. Background Art

[0002] Because the indwelling needle can relieve the patient's pain caused by repeated punctures, protect blood vessels, reduce fluid extravasation, reduce the workload of nurses, and allow patients to move freely, which improves the patient's quality of life. The intravenous indwelling needle reserves an open venous access for the patient, which provides convenience for blood transfusion and infusion, and is conducive to the development of rescue work. Inspired by the use of indwelling needles, dialysis indwelling needles have gradually become popular among hemodialysis patients. However, dialysis indwelling needles are disposable items and will be recycled after use. In order to avoid needle punctures during garbage disposal or recycling, resulting in secondary cross-infection, existing hemodialysis indwelling needles are required to be equipped with a safety protection structure to protect the used indwelling needles. Summary of the invention

[0003] The purpose of the present invention is to provide a safe hemodialysis indwelling needle which is simple in structure and easy to use.

[0004] To achieve the above-mentioned purpose, the present invention provides a safe hemodialysis indwelling needle, including a needle tube assembly and a catheter assembly, wherein the needle tube assembly includes a hemodialysis needle tube and a needle seat, and the rear end of the hemodialysis needle tube is fixedly arranged on the needle seat; the catheter assembly includes a catheter and a catheter seat, and the rear end of the catheter is fixedly arranged on the catheter seat, and an axial needle tube channel is arranged in the center of the catheter assembly, characterized in that: the safe hemodialysis indwelling needle is also provided with a needle tip shielding assembly, an axially penetrating needle passage is arranged in the needle tip shielding assembly, the needle tip shielding assembly is connected to the rear end of the catheter assembly and is detachably connected to the catheter assembly, the needle passage is coaxially connected to the needle tube channel, a magnet cavity is arranged in the needle tip shielding assembly, and the needle passage passes through the magnet cavity, A needle cavity is provided in the needle passage behind the magnet cavity, and a first fixed magnet and a movable magnet are provided in the magnet cavity. The movable magnet has an initial state separated from the first fixed magnet and a protective state attracted to the first fixed magnet in the magnet cavity. In the initial state, the movable magnet is outside the needle passage, and in the protective state, the movable magnet is in the needle passage; the hemodialysis needle tube in the needle tube assembly is inserted into the axial needle tube channel in the catheter assembly through the gap of the needle passage, and the needle tube assembly is detachably connected to the needle tip shielding assembly; the needle passage is also provided with a limiting mechanism for limiting the needle in the needle cavity and preventing the hemodialysis needle tube needle tip from being pulled off the needle tip shielding assembly.

[0005] As a further configuration of the present invention, the needle tip shielding assembly includes a safety cover and a barrel-shaped safety shell, the safety shell cover is covered on the opening of the safety shell, and the inner cavity constitutes the needle cavity; a through hole is provided in the center of the safety cover and the bottom of the safety shell, and a concave cavity is provided on one side of the safety cover facing the inner cavity and on one side of the through hole to constitute a first fixed magnet cavity; a channel opposite to the first fixed magnet cavity is also provided on the side of the safety cover facing the inner cavity, the through hole passes through the channel, the movable magnet is slidably arranged in the channel, the first fixed magnet is fixedly arranged in the first fixed magnet cavity, and the through hole and the needle cavity constitute the needle passage; an anti-slip sheet is also provided in the needle cavity, a needle hole is provided in the center of the anti-slip sheet with a clearance matching the diameter of the hemodialysis needle tube, a protruding clamping position is provided on the side wall of the front section of the hemodialysis needle tube close to the needle, and the needle of the hemodialysis needle tube passes through the needle hole of the anti-slip sheet, and the clamping position is on the front side of the anti-slip sheet, thereby constituting the limiting mechanism.

[0006] As a further configuration of the present invention, the safety cover and the safety shell are detachably connected.

[0007] As a further configuration of the present invention, the needle tip shielding assembly is cylindrical as a whole, the safety cover body is disc-shaped, and a pair of legs are symmetrically provided at both ends facing the inner cavity, and snap holes are provided on the legs. The shape of the open end of the safety shell is adapted to the space between the pair of legs, and raised blocks are provided at positions corresponding to the snap holes on both sides of the open end of the safety shell, and the snap holes and the blocks match to form the detachable connection.

[0008] As a further configuration of the present invention, the catheter assembly also includes a section of hose and a hose seat, both of which are tubular components, the front end of the hose is fixedly connected to the needle seat, and the rear end of the hose is fixedly connected to the front end of the hose seat; the safety hemodialysis indwelling needle is also provided with an isolation assembly, a rubber plug cavity is provided in the middle of the isolation assembly, an axial through channel is provided in the center of the isolation assembly for the hemodialysis needle tube to pass through, the through channel passes through the rubber plug cavity, a rubber plug is provided in the rubber plug cavity, the front end of the isolation assembly is fixedly connected to the hose seat, and the rear end of the isolation assembly is detachably connected to the needle tip shielding assembly.

[0009] As a further configuration of the present invention, the isolation component is cylindrical as a whole, and includes an isolation joint and an isolation upper cover. The isolation joint is in the shape of a stepped shaft with a larger front portion and a smaller rear portion. The front end face of the isolation joint is provided with an annular groove matching the rear end of the hose seat, and the rear end face is provided with a cavity constituting the rubber plug cavity. The isolation upper cover is cylindrical as a whole, and the front end is provided with a cavity matching the rear end of the isolation joint, and the rear end is provided with a cavity matching the safety cover. A concave cavity matching the second fixed magnet is provided at a position corresponding to the first fixed magnet cavity at the bottom of the cavity to constitute the second fixed magnet cavity, and the second fixed magnet is fixedly arranged in the second fixed magnet cavity; the rear end of the hose seat is inserted into the annular groove on the front end face of the isolation joint and is threadedly connected, the front end of the isolation upper cover is fixedly plugged with the rear end of the isolation joint, and the rear end of the isolation upper cover is gap-fitted with the safety cover, and the first fixed magnet and the second fixed magnet are arranged oppositely and attract each other to constitute a detachable connection between the rear end of the isolation component and the needle tip shielding component.

[0010] As a further configuration of the present invention, the front end of the needle seat is provided with a cavity matching the gap of the safety shell, the safety shell is arranged in the cavity, the front end of the cavity matches the rear end of the isolation cover, and the rear end of the isolation cover is plugged into the front end of the needle seat so that the needle tube assembly and the isolation assembly form a detachable connection.

[0011] As a further configuration of the present invention, a protective sleeve consisting of an upper sleeve with one end open and a lower sleeve is also provided. The upper sleeve and the lower sleeve are inserted into each other to cover the needle tube assembly, catheter assembly, needle tip shielding assembly and isolation assembly in the inner cavity.

[0012] The safe hemodialysis indwelling needle of the present invention comprises a hemodialysis needle tube assembly, a catheter assembly and a needle tip shielding assembly. The needle tip shielding assembly is provided with a needle cavity, a needle passage and a limiting mechanism for limiting the needle in the needle cavity to prevent the hemodialysis needle tube needle tip from being pulled off the needle tip shielding assembly. A magnet cavity is also provided in the needle passage, and a first fixed magnet and a movable magnet are provided in the magnet cavity. In the initial state, the movable magnet is outside the needle passage. In the protection state, the attraction between the first fixed magnet and the movable magnet is used to place the movable magnet in the needle passage to seal the hemodialysis needle tube needle tip in the needle cavity, thereby shielding the needle tip and preventing the needle from stabbing people during garbage disposal or recycling, causing injuries and secondary cross infection.

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main appearance structure of a specific embodiment of the safe hemodialysis indwelling needle of the present invention;

[0015] Figure 2 for Figure 1 AA section view;

[0016] Figure 3 for Figure 2 Part I: Partial enlarged view;

[0017] Figure 4 This is a schematic diagram of the side appearance structure of a specific embodiment of the safe hemodialysis indwelling needle of the present invention;

[0018] Figure 5 for Figure 4 BB section view;

[0019] Figure 6 for Figure 5 Part II: Partial enlarged view;

[0020] Figure 7 This is a schematic diagram of the appearance structure of a specific embodiment of the safe hemodialysis indwelling needle of the present invention after removing the protective cover;

[0021] Figure 8 for Figure 7 CC section view;

[0022] Fig. 9 for Figure 8 Part III: Partial enlarged view;

[0023] Fig.10 It is one of the exploded perspective views of the local structure of a specific embodiment of the present invention;

[0024] Fig.11 This is the second exploded perspective view of the local structure of a specific embodiment of the present invention;

[0025] Fig.12 This is a schematic diagram of the appearance structure of a specific embodiment of a needle tip shielding assembly of the present invention;

[0026] Fig.13 This is one of the partial structural exploded views of a specific embodiment of a needle tip shielding assembly of the present invention;

[0027] Fig.14 This is the second partial structural exploded view of a specific embodiment of the needle tip shielding assembly of the present invention;

[0028] Fig.15 This is the third partial structural exploded view of a specific embodiment of the needle tip shielding assembly of the present invention;

[0029] Fig.16 This is a front view of a specific embodiment of the safe hemodialysis indwelling needle of the present invention in a protected state;

[0030] Fig.17 for Fig.16 DD section view;

[0031] Fig.18 for Fig.17 Part IV is a partial enlarged view;

[0032] Fig.19 It is a side view of a specific embodiment of the safe hemodialysis indwelling needle of the present invention in a protected state;

[0033] Fig. 20 for Fig.19 EE cross-sectional view;

[0034] Fig.21 for Fig. 20 Part V is a partial enlarged view. DETAILED DESCRIPTION

[0035] The safe hemodialysis indwelling needle of the present invention comprises a needle tube assembly 1, a catheter assembly 2 and a needle tip shielding assembly 3, wherein the needle tube assembly 1 comprises a hemodialysis needle tube 101 and a needle seat 102, wherein the rear end of the hemodialysis needle tube 101 is fixedly arranged on the needle seat 102; the catheter assembly 2 comprises a catheter 201 and a catheter seat 202, wherein the rear end of the catheter 201 is fixedly arranged on the catheter seat 202, an axial needle tube channel 203 is arranged at the center of the catheter assembly 2, an axial needle passage 203 is arranged in the needle tip shielding assembly 3, the needle tip shielding assembly 3 is connected to the rear end of the catheter assembly 2, and is detachably connected with the catheter assembly 2 so as to be separated and pulled out together with the needle tube assembly 1 after the puncture is completed, the needle passage is coaxially connected to the needle tube channel 203, a magnet cavity is arranged in the needle tip shielding assembly 3, and the needle passage passes through the magnet cavity A needle cavity 303 is provided in the needle passage behind the magnet cavity, a first fixed magnet 4 and a movable magnet 5 are provided in the magnet cavity, the movable magnet 5 has an initial state separated from the first fixed magnet 4 and a protective state attracted to the first fixed magnet 4 in the magnet cavity, in the initial state, the movable magnet 5 is outside the needle passage, in the protective state, the movable magnet 5 is in the needle passage; the hemodialysis needle tube 101 in the needle tube assembly 1 is inserted into the axial needle tube channel 203 in the catheter assembly 2 through the gap of the needle passage, and the needle tube assembly 1 is detachably connected to the needle tip shielding assembly 3; a limiting mechanism is also provided in the needle passage to limit the needle in the needle cavity 303 and prevent the needle tip of the hemodialysis needle tube 101 from being pulled off the needle tip shielding assembly 3.

[0036] The present invention will be described in detail below in conjunction with the preferred embodiments:

[0037] like Figure 1-3As shown, in this specific embodiment, the safe hemodialysis indwelling needle includes a needle tube assembly 1, a catheter assembly 2 and a needle tip shielding assembly 3, the needle tube assembly 1 includes a hemodialysis needle tube 101 and a needle seat 102, and the rear end of the hemodialysis needle tube 101 is fixedly arranged on the needle seat 102; the catheter assembly 2 includes a catheter 201 and a catheter seat 202, and the rear end of the catheter 201 is fixedly arranged on the catheter seat 202, and an axial needle tube channel 203 is provided in the center of the catheter assembly 2 for the hemodialysis needle tube 101 to pass through. In order to facilitate the connection with the needle tip shielding assembly 3, the safety hemodialysis indwelling needle is preferably also provided with an isolation assembly 6, and at the rear end of the catheter assembly 2 (the front end is the needle tip direction), it is preferably also provided with a section of hose 204 and a hose seat 205, the hose 204 and the hose seat 205 are both tubular components, the front end of the hose 204 is fixedly connected to the needle seat 102, the rear end of the hose 204 is fixedly connected to the front end of the hose seat 205, the isolation assembly 6 is connected to the rear end of the hose seat 205, a rubber plug cavity is provided in the middle of the isolation assembly 6, an axial through channel for the hemodialysis needle tube 101 to pass through is provided in the center of the isolation assembly 6, the through channel passes through the rubber plug cavity, a rubber plug 7 is provided in the rubber plug cavity, the front end of the isolation assembly 6 is fixedly connected to the hose seat 205, and the rear end of the isolation assembly 6 is detachably connected to the needle tip shielding assembly 3.

[0038] like Figure 1-9 As shown, in this specific embodiment, the isolation assembly 6 is cylindrical as a whole, and includes an isolation joint 601 and an isolation cover 602. The isolation joint 601 is in the shape of a stepped shaft with a larger front and a smaller rear. The front end face of the isolation joint 601 is provided with an annular groove matching the rear end gap of the hose seat 205, and the side wall of the annular groove is provided with a thread. The rear end face of the isolation joint 601 is provided with a cavity to constitute the rubber plug cavity. The isolation cover 602 is cylindrical as a whole, and the front end is provided with a cavity matching the rear end gap of the isolation joint 601. A sealing ring groove is provided on the outer side surface of the rear end of the isolation joint 601, and a sealing ring is provided in the sealing ring groove. The front end of the isolation cover 602 and the rear end of the isolation joint 601 form an interference fit fixed plug.

[0039] A cavity matching the safety cover 301 is provided at the rear end of the isolation upper cover 602, and a concave cavity matching the second fixed magnet 8 is provided at the bottom of the cavity corresponding to the first fixed magnet cavity 304 to form a second fixed magnet cavity, and the second fixed magnet 8 is fixedly arranged in the second fixed magnet cavity; the first fixed magnet 4 and the second fixed magnet 8 are arranged opposite to each other and attract each other to form a rear end of the isolation component 6 that is detachably connected to the needle tip shielding component 3. The needle tip shielding assembly 3 is provided with an axially penetrating needle passage, the needle tip shielding assembly 3 is connected to the rear end of the catheter assembly 2, and is detachably connected with the catheter assembly 2, so that it can be separated and pulled out together with the needle tube assembly 1 after the puncture is completed, the needle passage is coaxially connected with the needle tube channel 203, the needle tip shielding assembly 3 is provided with a magnet cavity, the needle passage passes through the magnet cavity, and a needle cavity 303 is provided in the needle passage behind the magnet cavity, a first fixed magnet 4 and a movable magnet 5 are provided in the magnet cavity, and the movable magnet 5 has a first fixed magnet 4 and a first movable magnet 5 in the magnet cavity, and the movable magnet 5 has a first fixed magnet 4 and a first movable magnet 5 in the magnet cavity. The fixed magnet 4 is in an initial state of separation and in a protective state of attraction with the first fixed magnet 4. In the initial state, the active magnet 5 is outside the needle passage, and in the protective state, the active magnet 5 is in the needle passage; the hemodialysis needle tube 101 in the needle tube assembly 1 passes through the gap of the needle passage and is inserted into the axial needle tube channel 203 in the catheter assembly 2, and the needle tube assembly 1 is detachably connected to the needle tip shielding assembly 3; a limiting mechanism is also provided in the needle passage to limit the needle in the needle cavity 303 and prevent the needle tip of the hemodialysis needle tube 101 from being pulled off the needle tip shielding assembly 3.

[0040] like Figure 12-15 As shown, in this specific embodiment, the needle tip shielding assembly 3 includes a safety cover 301 and a barrel-shaped safety shell 302, the safety shell 302 covers the opening of the safety shell 302, the safety cover 301 and the safety shell 302 are detachably connected, and the inner cavity constitutes the needle cavity 303. Preferably, the needle tip shielding assembly 3 is cylindrical as a whole, the main body of the safety cover 301 is disc-shaped, and a pair of legs 3011 are symmetrically provided at both ends facing the inner cavity, and buckle holes 3012 are provided on the legs 3011, the shape of the opening end of the safety shell 302 is adapted to the space between the pair of legs 3011, and protruding blocks 3021 are provided at positions corresponding to the buckle holes 3012 on both sides of the opening end of the safety shell 302, and the buckle holes 3012 and the blocks 3021 are matched to form a detachable connection.

[0041] A through hole is provided at the center of the bottom of the safety cover 301 and the safety shell 302. A concave cavity is provided on one side of the safety cover 301 facing the inner cavity and on one side of the through hole to form a first fixed magnet cavity 304. A channel opposite to the first fixed magnet cavity 304 is also provided on the side of the safety cover 301 facing the inner cavity. The through hole runs through the channel. The channel can be composed of a structure with a ∏-shaped cross-section arranged on the side of the safety cover 301 facing the inner cavity. The ∏-shaped structure is arranged between two legs 3011. The movable magnet 5 can be slidably arranged in the channel. A pair of clamping blocks are extended from two footholds at one end of the ∏-shaped structure to form the The first fixed magnet cavity 304, the first fixed magnet 4 is fixedly arranged in the first fixed magnet cavity 304, the through hole and the needle cavity 303 constitute the needle passage; the needle cavity 303 is also provided with an anti-slip sheet 9, the anti-slip sheet 9 is made of a metal sheet, and a needle hole is provided in the center to match the diameter gap of the hemodialysis needle tube 101, and a protruding clamping position 12 is provided on the side wall of the front section of the hemodialysis needle tube 101 close to the needle, and the protruding height of the clamping position 12 is greater than the diameter of the needle hole, and the needle of the hemodialysis needle tube 101 passes through the needle hole of the anti-slip sheet 9, and the clamping position 12 is on the front side of the anti-slip sheet 9, thereby constituting the limiting mechanism.

[0042] The front end of the needle seat 102 is provided with a cavity matching the gap of the safety shell 302, and the safety shell 302 is arranged in the cavity. The front end of the cavity matches the rear end of the isolation cover 602, and the rear end of the isolation cover 602 is plugged with the front end of the needle seat 102 to form a detachable connection between the needle tube assembly 1 and the isolation assembly 6.

[0043] In order to protect the needle tube assembly 1, the catheter assembly 2 and the needle tip shielding assembly 3 and facilitate transportation and storage, the safe hemodialysis indwelling needle of the present invention is also provided with a protective sheath consisting of an upper sheath 10 with an opening at one end and a lower sheath 11. The upper sheath 10 and the lower sheath 11 are inserted into each other to cover the needle tube assembly 1, the catheter assembly 2, the needle tip shielding assembly 3 and the isolation assembly 6 in the inner cavity.

[0044] Before using this safety hemodialysis indwelling needle after leaving the factory, Figure 1-3 As shown, the hemodialysis needle tube 101 in the needle tube assembly 1 passes through the needle tip shielding assembly 3 and the isolation assembly 6 in sequence to the catheter 201 of the catheter assembly 2, and the rear end of the isolation cover 602 is plugged into the front end of the needle seat 102 to form a detachable connection between the needle tube assembly 1 and the isolation assembly 6, and the needle tip shielding assembly 3 is placed in the cavity between the rear end of the isolation cover 602 and the front end of the needle seat 102, and the needle tip shielding assembly 3 attracts the needle tip shielding assembly 3 and the isolation assembly 6 together through the attraction between the first fixed magnet 4 and the second fixed magnet 8 therein. At this time, the first fixed magnet 4 and the hemodialysis needle tube 101 separated by the active magnet 5 are respectively located on both sides of the needle passage.

[0045] After using the safety hemodialysis indwelling needle, hold the needle seat 102 and pull it out from the back side. When the needle tip of the hemodialysis needle tube 101 retreats to the back side of the hole on the safety cover 301 in the needle tip shielding assembly 3 and enters the needle cavity 303, continue to pull back. Since the needle cavity 303 is also provided with an anti-slip sheet 9, the front section of the hemodialysis needle tube 101 close to the needle is stuck on the anti-slip sheet 9, preventing the hemodialysis needle tube 101 from being pulled out of the safety shell 302 in the needle tip shielding assembly 3. At this time, continue to pull the needle seat 102 backward, the anti-slip sheet 9 will drive the needle tip shielding assembly 3, and when the pulling force is greater than the attraction between the first fixed magnet 4 and the second fixed magnet 8, the needle tip shielding assembly 3 will separate from the isolation assembly 6, completing the indwelling operation. Figure 16-21 As shown, the needle tip shielding assembly 3 and the needle tube assembly 1 are recycled.

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A safe hemodialysis indwelling needle, comprising a needle tube assembly and a catheter assembly, wherein the needle tube assembly comprises a hemodialysis needle tube and a needle seat, and the rear end of the hemodialysis needle tube is fixedly arranged on the needle seat; the catheter assembly comprises a catheter and a catheter seat, and the rear end of the catheter is fixedly arranged on the catheter seat, and an axial needle tube channel is arranged in the center of the catheter assembly, characterized in that: The safe hemodialysis indwelling needle is also provided with a needle tip shielding assembly, in which an axially penetrating needle passage is provided, the needle tip shielding assembly is connected to the rear end of the catheter assembly and is detachably connected with the catheter assembly, the needle passage and the needle tube passage are coaxially connected, a magnet cavity is provided in the needle tip shielding assembly, the needle passage passes through the magnet cavity, a needle cavity is provided in the needle passage behind the magnet cavity, a first fixed magnet and an active magnet are provided in the magnet cavity, the active magnet has an initial state separated from the first fixed magnet and a protective state attracted to the first fixed magnet in the magnet cavity, in the initial state, the active magnet is outside the needle passage, and in the protective state, the active magnet is in the needle passage; the hemodialysis needle tube in the needle tube assembly passes through the needle passage and is inserted into the axial needle tube passage in the catheter assembly with a clearance fit, and the needle tube assembly is detachably connected with the needle tip shielding assembly; the needle passage is also provided with a needle limiter at the needle tip The needle tip shielding assembly comprises a safety cover and a barrel-shaped safety shell, wherein the safety shell cover covers the opening of the safety shell, and the inner cavity constitutes the needle head cavity; a through hole is provided at the center of the bottom of the safety cover and the safety shell, and a concave cavity is provided on one side of the safety cover facing the inner cavity and one side of the through hole to constitute a first fixed magnet cavity, and a hole opposite to the first fixed magnet cavity is also provided on the side of the safety cover facing the inner cavity, and the through hole passes through the hole The movable magnet is slidably arranged in the channel, the first fixed magnet is fixedly arranged in the first fixed magnet cavity, the through hole and the needle cavity constitute the needle passage; an anti-slip sheet is also arranged in the needle cavity, a needle hole which matches the clearance of the diameter of the hemodialysis needle tube is arranged at the center of the anti-slip sheet, a protruding clamping position is arranged on the side wall of the front section of the hemodialysis needle tube close to the needle, the needle of the hemodialysis needle tube passes through the needle hole of the anti-slip sheet, and the clamping position is on the front side of the anti-slip sheet, thereby constituting the limiting mechanism.

2. The safe hemodialysis indwelling needle according to claim 1, characterized in that: The safety cover is detachably connected to the safety shell.

3. The safe hemodialysis indwelling needle according to claim 2, characterized in that: The needle tip shielding assembly is cylindrical as a whole, and the safety cover body is disc-shaped. A pair of legs are symmetrically provided at both ends facing the inner cavity, and snap holes are provided on the legs. The shape of the open end of the safety shell is adapted to the space between the pair of legs. Raised blocks are provided at positions corresponding to the snap holes on both sides of the open end of the safety shell, and the snap holes and the blocks match to form the detachable connection.

4. The safe hemodialysis indwelling needle according to claim 3, characterized in that: The catheter assembly also includes a section of hose and a hose seat, both of which are tubular components, the front end of the hose is fixedly connected to the needle seat, and the rear end of the hose is fixedly connected to the front end of the hose seat; the safety hemodialysis indwelling needle is also provided with an isolation assembly, a rubber plug cavity is provided in the middle of the isolation assembly, an axial through channel for the hemodialysis needle tube to pass through is provided in the center of the isolation assembly, the through channel passes through the rubber plug cavity, a rubber plug is provided in the rubber plug cavity, the front end of the isolation assembly is fixedly connected to the hose seat, and the rear end of the isolation assembly is detachably connected to the needle tip shielding assembly.

5. The safe hemodialysis indwelling needle according to claim 4, characterized in that: The isolation component is cylindrical as a whole, and includes an isolation joint and an isolation upper cover. The isolation joint is in the shape of a stepped shaft with a larger front and a smaller rear. The front end face of the isolation joint is provided with an annular groove matching the rear end of the hose seat, and the rear end face is provided with a cavity to constitute the plug cavity. The isolation upper cover is cylindrical as a whole, and the front end is provided with a cavity matching the rear end of the isolation joint, and the rear end is provided with a cavity matching the safety cover. The bottom of the cavity is provided with a concave cavity matching the second fixed magnet at a position corresponding to the first fixed magnet cavity, forming the second fixed magnet cavity, and the second fixed magnet is fixedly arranged in the second fixed magnet cavity; the rear end of the hose seat is inserted into the annular groove on the front end face of the isolation joint and is threadedly connected, the front end of the isolation upper cover is fixedly plugged with the rear end of the isolation joint, and the rear end of the isolation upper cover is plugged with the safety cover with a gap fit, and the first fixed magnet and the second fixed magnet are arranged oppositely and attract each other to form a detachable connection between the rear end of the isolation component and the needle tip shielding component.

6. The safe hemodialysis indwelling needle according to claim 5, characterized in that: The front end of the needle seat is provided with a cavity matching the gap of the safety shell, the safety shell is arranged in the cavity, the front end of the cavity matches the rear end of the isolation cover, and the rear end of the isolation cover is plugged into the front end of the needle seat so that the needle tube assembly and the isolation assembly form a detachable connection.

7. The safe hemodialysis indwelling needle according to any one of claims 1 to 6, characterized in that: A protective sleeve consisting of an upper sleeve with one end open and a lower sleeve is also provided. The upper sleeve and the lower sleeve are inserted into each other to cover the needle tube assembly, the catheter assembly, the needle tip shielding assembly and the isolation assembly in the inner cavity.

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