Indwelling needle with eccentric baffle for shielding needle

Abstract

The invention discloses an indwelling needle with an eccentric baffle for shielding a needle, comprising: a needle protective sleeve, the front part of which is provided with a cavity, the front end surface of which is provided with a front port, and the rear part of which is provided with a needle through hole; an eccentric baffle installed in the cavity of the needle protective sleeve, which is provided with an eccentric hole and a plurality of blind holes; a spring clip, which comprises a front baffle portion, a rear baffle portion, a connecting portion, and an elastic cantilever portion, and the elastic cantilever portion drives the eccentric baffle to move; a needle seat; a needle tube, which passes through the spring clip, the eccentric baffle, and the needle protective sleeve, and the rear end is fixed on the needle seat, and a ring-shaped protrusion is provided near the needle tip; and a catheter seat assembly. Pull the needle seat backwards to make it drive the needle tube backwards. When the needle tip of the needle tube exits the eccentric hole of the eccentric baffle, self-destruction is achieved. At this time, the elastic cantilever portion of the spring clip drives the eccentric baffle to block the needle through hole of the needle shield. The annular protrusion of the needle tube cooperates with the stop needle hole on the rear baffle portion of the spring clip to limit the axial rear position of the needle tube. The needle tip is shielded in the needle shield, thereby improving the safety of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of indwelling needles, and in particular relates to an indwelling needle with an eccentric baffle for shielding the needle. Background Art

[0002] The disadvantage of some existing indwelling needles is that after venipuncture, the needle tube is pulled out and the needle tip of the used needle tube is exposed. Therefore, when cleaning and destroying the indwelling needle tube, it is easy to stab medical staff or other people, causing cross infection. Some indwelling needles are designed with a needle tube retraction mechanism, but the structure of this needle tube retraction mechanism is not reliable enough, and the needle tip of the needle tube may extend again, posing a safety hazard. Summary of the invention

[0003] In view of the above problems, the present invention provides an indwelling needle with an eccentric baffle for shielding the needle.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] An indwelling needle with an eccentric baffle for shielding the needle, comprising:

[0006] The needle protection sleeve has a cavity in the front part, a push rod guide hole communicating with the cavity is opened on the lower side of the side wall, a front port communicating with the cavity is opened on the front end surface, and a needle through hole penetrating along the axis is opened in the rear part;

[0007] An eccentric baffle is installed in the cavity of the needle shield and arranged along the radial surface. The number of the baffle is more than one. The baffle is provided with an eccentric hole. The rear end surface of the baffle is provided with a plurality of blind holes arranged circumferentially on the circumference of the eccentric hole. The outer contour of the baffle is provided with more than two fulcrums.

[0008] The spring clip comprises a front baffle portion, a rear baffle portion, a connecting portion, and an elastic cantilever portion, wherein the front baffle portion is installed at the front portion of the cavity of the needle shield and limits the axial front position of the eccentric baffle, the front baffle portion is provided with a needle hole coaxial with the needle through hole of the needle shield, the rear baffle portion is installed in the rear portion of the needle shield and divides the needle through hole of the needle shield into two sections, the rear baffle portion is provided with a stop needle hole coaxial with the needle through hole of the needle shield, the connecting portion connects the front baffle portion and the rear baffle portion, the elastic cantilever portion is installed in the needle shield, the rear end of the elastic cantilever portion is connected to the rear baffle portion, the front end of the elastic cantilever portion is provided with a buckle and extends to the front port of the needle shield, and the elastic cantilever portion is pushed upward by the eccentric baffle to generate elastic deformation;

[0009] A needle seat connected to the rear side of the needle guard;

[0010] The needle tube, whose rear end extends from the front port of the needle shield, passes through the needle hole of the spring clip, the eccentric hole of the eccentric baffle, the front section of the needle through hole of the needle shield, the stop needle hole of the spring clip, and the rear section of the needle through hole of the needle shield in sequence along the axial direction, and is fixed on the needle seat, and its front end is the needle tip and is exposed after passing through the catheter seat assembly, and is provided with slots and annular protrusions arranged front and back near the needle tip; and

[0011] A catheter seat assembly, comprising a catheter seat, a metal wedge, a catheter, and an isolation plug, wherein the rear portion of the catheter seat is installed in the front end of the needle protective sleeve, and a bayonet port is provided on the rear side wall of the catheter seat to match the buckle of the spring clip;

[0012] The outer diameter of the annular protrusion of the needle tube is larger than the stop pinhole of the spring clip, and smaller than the needle through hole of the needle protective sleeve, the eccentric hole of the eccentric baffle, the pinhole of the spring clip, and the inner hole of the catheter of the catheter seat assembly;

[0013] When the needle seat is pulled backward, the indwelling needle is triggered to self-destruct, and the needle seat drives the needle tube to retreat axially. When the needle tip of the needle tube exits the eccentric hole of the eccentric baffle, the eccentric baffle that has lost the support of the needle tube moves freely in the cavity of the needle protection sleeve until it reaches a balanced state. At this time, the eccentric baffle contacts the inner wall of the cavity of the needle protection sleeve through more than two fulcrums of the outer contour to maintain balance, and the solid surface of the eccentric baffle completely blocks the front end of the front section of the needle through hole of the needle protection sleeve, and the blind hole of the eccentric baffle avoids the needle tip of the needle tube from entering the eccentric hole. When the needle tip of the needle tube continues to retreat, the annular protrusion of the needle tube is blocked by the stop pinhole of the spring clip, so that the needle tip of the needle tube is shielded in the needle protection sleeve; the elastic cantilever portion of the spring clip recovers its deformation, and the buckle at the front end of the elastic cantilever portion is disengaged from the bayonet of the catheter seat of the catheter seat assembly, and the catheter seat assembly can be removed from the front end of the needle protection sleeve.

[0014] Furthermore, the front side wall of the cavity of the needle shield is provided with a plurality of stop protrusions arranged along the circumferential direction, and after the eccentric baffle is installed from the front port of the needle shield, it is pressed through the outer contour to pass over the stop protrusions on the front side wall of the cavity and installed into the cavity.

[0015] Furthermore, the front port side wall of the needle shield is provided with a guide groove and / or a guide rib, and the rear side wall of the catheter seat of the catheter seat assembly is provided with a guide rib matched with the guide groove and / or a guide groove matched with the guide rib.

[0016] Furthermore, a front baffle notch communicating with the front part of the cavity is formed on the side wall of the needle shield, and the front baffle part of the spring clip is installed into the front part of the cavity of the needle shield through the front baffle notch.

[0017] Furthermore, a rear baffle portion slot is provided in the rear portion of the needle guard, the rear baffle portion of the spring clip is installed in the rear baffle portion slot, and a plurality of first elastic hooks are provided on the rear baffle portion of the spring clip, the first elastic hooks are squeezed in the rear baffle portion slot to provide a force, so that the rear baffle portion of the spring clip is clamped in the rear baffle portion slot.

[0018] Furthermore, an opening is provided on the left or right side of the side wall of the needle guard sleeve, and two connection portion fixing blocks connected to the internal structure of the needle guard sleeve are provided in the opening, the two connection portion fixing blocks are arranged up and down and have tooth surfaces facing each other, the connection portion of the spring clip is installed in the opening, and more than two second elastic hooks are provided on the connection portion of the spring clip, and the more than two second elastic hooks are pressed against the tooth surfaces of the two connection portion fixing blocks, so that the connection portion of the spring clip is clamped in the opening of the needle guard sleeve.

[0019] Furthermore, an elastic cantilever portion slot is provided on the upper side of the needle protection sleeve, a plurality of clamping protrusions are provided on the slot wall of the elastic cantilever portion slot, and the rear portion of the elastic cantilever portion of the spring clip is installed in the elastic cantilever portion slot and clamped by the clamping protrusions.

[0020] Furthermore, the needle seat includes a seat body and a handle portion, the seat body is provided with an inner hole and a needle fixing hole which are connected front and back along the axis, the seat body is sleeved on the rear part of the needle protection sleeve through the inner hole, the rear end of the needle tube is fixed in the needle fixing hole, and the handle portion is connected to the side of the seat body.

[0021] Furthermore, it also includes an infusion hose assembly, which includes an infusion hose, a hemostatic clamp, an infusion connector, a heparin cap, and an end cap.

[0022] Compared with the prior art, the present invention has the following beneficial effects: the overall structure is compact and the operation is simple. The needle seat is pulled backwards to drive the needle tube to retreat axially. When the needle tip of the needle tube exits the eccentric hole of the eccentric baffle, the indwelling needle is self-destructed. The eccentric baffle that has lost the support of the needle tube moves freely in the cavity of the needle protective sleeve until it reaches a balanced state. At this time, the eccentric baffle blocks the front end of the front section of the needle through hole of the needle protective sleeve. The stop needle hole of the spring clip cooperates with the annular protrusion of the needle tube to limit the needle tube in the axial direction, so that the needle tip of the needle tube is shielded in the needle protective sleeve, thereby improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0024] Figure 2 This is a schematic diagram of the decomposition structure of Example 1.

[0025] Figure 3This is a cross-sectional view of Example 1.

[0026] Figure 4 Schematic diagram of the structure of the needle protection sleeve in Example 1.

[0027] Figure 5 This is a three-dimensional cross-sectional schematic diagram of the needle protection sleeve in Example 1.

[0028] Figure 6 This is another schematic diagram of the structure of the needle protection sleeve in Example 1.

[0029] Figure 7 This is a schematic diagram of the front end structure of the needle protection sleeve in Example 1.

[0030] Figure 8 Schematic diagram of the structure of the eccentric baffle in Example 1.

[0031] Fig. 9 This is a cross-sectional view of the eccentric baffle in Example 1.

[0032] Fig.10 Schematic diagram of a posture of the single eccentric baffle in Example 1 in a balanced state.

[0033] Fig.11 Schematic diagram of another posture of the single eccentric baffle in Example 1 in a balanced state.

[0034] Fig.12 Schematic diagram of the structure of the spring clip in Example 1.

[0035] Fig.13 Another structural schematic diagram of the spring clip in Example 1.

[0036] Fig.14 The figure is a schematic diagram of the assembly process of the needle protection sleeve, the eccentric baffle and the spring clip in Example 1.

[0037] Fig.15 This is a cross-sectional view of the needle seat in Example 1.

[0038] Fig.16 Schematic diagram of the structure of the needle tube in Example 1.

[0039] Fig.17 The figure is a schematic diagram of the assembly process of the needle tube, needle seat, and assembled needle protection sleeve, eccentric baffle, and spring clip in Example 1.

[0040] Fig.18 Schematic diagram of the structure of the catheter seat assembly in Example 1.

[0041] Fig.19 Schematic diagram of the structure of the catheter seat in Example 1.

[0042] Fig. 20 This is a schematic diagram of Example 1 in which the handle of the needle seat is held to push the needle seat and the needle tube to the desired position so that the indwelling needle is in an unused state.

[0043] Fig.21 This is a schematic diagram of Example 1 from an unused state to a self-destruct state.

[0044] Fig. 22 It is a schematic diagram of the posture of three eccentric baffles in a balanced state.

[0045] Fig.23 It is a schematic diagram of another posture of the three eccentric baffles in a balanced state.

[0046] Fig.24 This is a schematic diagram of the overall structure of Example 2.

[0047] The parts in the figure are numbered as follows:

[0048] 1 needle protective sleeve

[0049] 101 Cavity

[0050] 102 stop protrusion

[0051] 103 ejector guide hole

[0052] 104 guide slot

[0053] 105 guide ribs

[0054] 106-pin through-hole

[0055] 107 front baffle notch

[0056] 108 rear baffle slot

[0057] 109 connection fixing block

[0058] 110 elastic cantilever slot

[0059] 111 tooth surface

[0060] 112 clamping protrusion

[0061] 2 Eccentric baffle

[0062] 201 eccentric hole

[0063] 202 blind hole

[0064] 203 pivot a

[0065] 204 fulcrum b

[0066] 205 fulcrum c

[0067] 3 Spring clips

[0068] 301 front baffle

[0069] 302 rear baffle

[0070] 303 connection

[0071] 304 elastic cantilever part

[0072] 305 pinhole

[0073] 306 stop pinhole

[0074] 307 first elastic hook

[0075] 308 second elastic hook

[0076] 309 buckle

[0077] 4-pin header

[0078] 401 body part

[0079] 402 handle part

[0080] 403 inner hole

[0081] 404 pin fixing hole

[0082] 5 needle tube

[0083] 501 slots

[0084] 502 annular protrusion

[0085] 6 Catheter seat assembly

[0086] 601 catheter seat

[0087] 6011 guide rib

[0088] 6012 guide groove

[0089] 6013 bayonet

[0090] 602 Metal Wedge

[0091] 603 catheter

[0092] 604 Isolation Plug

[0093] 7Infusion hose assembly

[0094] 8 ejector rods. DETAILED DESCRIPTION

[0095] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, rather than limiting the scope of the present invention. Example 1

[0096] See also Figures 1 to 3 A retention needle with an eccentric baffle for shielding a needle comprises a needle protection sleeve 1, an eccentric baffle 2, a spring clip 3, a needle seat 4, a needle tube 5, and a catheter seat assembly 6.

[0097] See also Figures 4 to 7 A cavity 101 is provided in the front of the needle shield 1 , a plurality of stop protrusions 102 arranged circumferentially are provided on the front of the side wall of the cavity 101 , and a push rod guide hole 103 communicating with the cavity 101 is provided on the lower side of the side wall of the needle shield 1 .

[0098] The front end surface of the needle shield 1 is provided with a front port communicating with the cavity 101, and the side wall of the front port is provided with an axially extending guide groove 104 and a guide rib 105, the guide groove 104 and the guide rib 105 are arranged symmetrically at 180 degrees, the front end of the guide groove 104 extends to the front end surface of the needle shield 1, and the guide rib 105 is arranged on the inner wall of the front port.

[0099] A needle through hole 106 penetrating along the axis is provided in the rear portion of the needle protection sleeve 1 , the front end of the needle through hole 106 is communicated with the cavity 101 , and the rear end of the needle through hole 106 is connected to the center of the rear end surface of the needle protection sleeve 1 .

[0100] The left or right side wall of the needle shield 1 is open from the cavity 101 to the rear end surface, and a spring clip mounting structure is provided on the needle shield 1. The spring clip mounting structure includes a front baffle notch 107, a rear baffle slot 108, two connection fixing blocks 109, and an elastic cantilever slot 110.

[0101] The front baffle notch 107 is arranged at the front end of the opening and is correspondingly connected to the front of the cavity 101. The rear baffle slot 108 is opened along the radial surface in the rear part of the needle shield 1 and is connected to the opening. The rear baffle slot 108 divides the needle through hole 106 into two sections. The two connecting portion fixing blocks 109 are arranged at the front of the opening and are connected to the internal structure of the needle shield 1. The two connecting portion fixing blocks 109 are arranged up and down and the facing surfaces are provided with tooth surfaces 111. The elastic cantilever slot 110 is opened along the axial direction on the upper side of the needle shield 1 and is connected to the cavity 101, the opening and the rear baffle slot 108. A plurality of clamping protrusions 112 are provided on the slot wall of the elastic cantilever slot 110.

[0102] See also Figure 3 , Figure 8 and Fig. 9The eccentric baffle 2 is installed in the cavity 101 of the needle protection sleeve 1 and is arranged along the radial surface. The number of eccentric baffles 2 is more than one. The eccentric baffle 2 is provided with a through eccentric hole 201. The eccentric hole 201 is provided with rounded corners along the edge. The rear end surface of the eccentric baffle 2 is provided with a plurality of blind holes 202 uniformly distributed on the side of the eccentric hole 201 along the circumferential direction. The outer contour of the eccentric baffle 5 is provided with more than two fulcrums.

[0103] The outer contour shape, the number of fulcrums, and the distribution position of the fulcrums of the eccentric baffle 2 are variable. In this embodiment, the outer contour of the eccentric baffle 2 is provided with 6 fulcrums, namely, 2 fulcrums a203, 2 fulcrums b204, and 2 fulcrums c205. The eccentric baffle 2 has 2 postures in a balanced state in the cavity 101 of the needle shield 1, see Fig.10 and Fig.11 .

[0104] See also Figure 3 , Fig.12 and Fig.13 The spring clip 3 is installed in the needle protection sleeve 1 , and the spring clip 3 includes a front baffle portion 301 , a rear baffle portion 302 , a connecting portion 303 , and an elastic cantilever portion 304 .

[0105] The front baffle portion 301 is installed at the front of the cavity 101 through the front baffle portion notch 107 of the needle shield 1. The front baffle portion 301 and the internal structure of the needle shield 1 limit the eccentric baffle 2 in the axial direction. The front baffle portion 301 is provided with a needle hole 305 coaxial with the needle through hole 106 of the needle shield 1.

[0106] The rear baffle portion 302 is installed in the rear baffle portion slot 108 through the opening of the needle protection sleeve 1. The rear baffle portion 302 is provided with a stop needle hole 306 coaxial with the needle through hole 106 of the needle protection sleeve 1. The rear baffle portion 302 is provided with a plurality of first elastic hooks 307 that cooperate with the rear baffle portion slot 108. The first elastic hooks 307 are squeezed in the rear baffle portion slot 108 to provide a force, so that the rear baffle portion 302 is clamped in the rear baffle portion slot 108.

[0107] The two ends of the connecting portion 303 are connected to the front baffle portion 301 and the rear baffle portion 302 respectively. The connecting portion 303 is arranged along the opening of the needle shield 1. The connecting portion 303 is provided with two or more second elastic hooks 308 that cooperate with the two connecting portion fixing blocks 109 of the needle shield 1. The two or more second elastic hooks 308 are pressed against the tooth surfaces 111 of the two connecting portion fixing blocks 109, so that the connecting portion 303 is positioned at the opening of the needle shield 1.

[0108] The rear end of the elastic cantilever portion 304 is connected to the rear baffle portion 302, the elastic cantilever portion 304 is installed in the needle shield 1 through the opening of the needle shield 1, the rear part of the elastic cantilever portion 304 is installed in the elastic cantilever portion slot 110 of the needle shield 1 and is clamped by the clamping protrusion 112, the front end of the elastic cantilever portion 304 extends to the front end of the needle shield 1, the front end of the elastic cantilever portion 304 is provided with a buckle 309, and the elastic cantilever portion 304 is pushed upward by the eccentric baffle 2 through the front to generate elastic deformation.

[0109] See also Fig.14 The assembly process of the needle shield 1, the eccentric baffle 2, and the spring clip 3 is as follows: first, the eccentric baffle 2 is installed into the cavity 101 of the needle shield 1, specifically, the eccentric baffle 2 is installed from the front port of the needle shield 1, so that the outer contour of the eccentric baffle 2 is squeezed over the stop protrusion 102 at the front part of the side wall of the cavity 101, and then installed into the cavity 101. Then the spring clip 3 is installed in the needle shield 1, specifically, the front baffle part 301 of the spring clip 3 is installed from the front baffle part notch 107 of the needle shield 1 to the front part of the cavity 101, the rear baffle part 302 of the spring clip 3 is installed from the open end of the needle shield 1 into the rear baffle part slot 108, the rear baffle part 302 is clamped in the rear baffle part slot 108 by the first elastic hook 307, and the connecting part 303 of the spring clip 3 is set on the needle shield. The opening of the sleeve 1 causes the second elastic hooks 308 arranged in two upper and lower rows to be pressed against the tooth surfaces 111 of the two connecting portion fixing blocks 109 of the needle protection sleeve 1, and the elastic cantilever portion 304 of the spring clip 3 is installed into the needle protection sleeve 1 from the opening of the needle protection sleeve 1, the rear part of the elastic cantilever portion 304 is installed in the elastic cantilever portion slot 110 and is clamped by the clamping protrusion 112, and the front part of the elastic cantilever portion 304 is arranged on the upper side of the eccentric baffle 2.

[0110] See also Fig.15 The needle seat 4 includes a seat body 401 and a handle portion 402. The seat body 401 is provided with an inner hole 403 and a needle fixing hole 404 which are connected front and back along the axis. The seat body 401 covers the rear part of the needle protection sleeve 1 through the inner hole 403. The needle fixing hole 404 is used to fix the rear end of the needle tube 5. The handle portion 402 is connected to the side of the seat body 401.

[0111] See also Fig.16 The front end of the needle tube 5 is a needle tip, and a slot hole 501 and an annular protrusion 502 arranged front and back along the axial direction are provided near the needle tip of the needle tube 5. The slot hole 501 is opened along the axial direction of the needle tube 5, and the annular protrusion 502 is circumferentially protrudingly arranged on the outer wall of the needle tube 5. The outer diameter of the annular protrusion 502 is larger than the stop needle hole 306 of the spring clip 3, and smaller than the needle through hole 106 of the needle protection sleeve 1, the eccentric hole 201 of the eccentric baffle 2, the needle hole 305 of the spring clip 3, and the inner hole of the catheter 603 of the catheter seat assembly 6.

[0112] See also Fig.17 The assembly process of the needle tube 5, needle seat 4 and the assembled needle shield 1, eccentric baffle 2, and spring clip 3 is as follows: first, insert the auxiliary tool push rod 8 from the push rod guide hole 103 of the needle shield 1, operate the push rod 8 to push up the eccentric baffle 2 in the cavity 101, and align the eccentric hole 201 of the eccentric baffle 2 with the needle through hole 106 of the needle shield 1. Then, insert the rear end of the needle tube 5 from the front end of the needle shield 1, and make the rear end of the needle tube 5 pass through the needle hole 305 of the spring clip 3, the eccentric hole 201 of the eccentric baffle 2, the front section of the needle through hole 106 of the needle shield 1, the stop needle hole 306 of the spring clip 3, and the rear section of the needle through hole 106 of the needle shield 1 in the axial direction backward, and then extend from the rear end of the needle shield 1. Next, insert the rear end of the needle tube 5 into the needle fixing hole 404 through the inner hole 403 of the needle seat 4, and fix it with environmentally friendly quick-drying glue. At this time, the auxiliary tool push rod 8 is removed, and the needle tube 5 supports the eccentric baffle 2 to push upward against the front part of the elastic cantilever part 304 of the spring clip 3, so that the elastic cantilever part 304 maintains elastic deformation.

[0113] See also Fig.18 The catheter seat assembly 6 includes a catheter seat 601, a metal wedge 602, a catheter 603, and an isolation plug 604. The metal wedge 602 and the isolation plug 604 are installed in the catheter seat 601. The front part of the catheter 603 extends out from the front end of the catheter seat 601, and the rear end of the catheter 603 is fixed on the metal wedge 602.

[0114] Among them, see Figure 3 and Fig.19 The rear portion of the catheter seat 601 is installed in the front end of the needle shield 1, and the rear side wall of the catheter seat 601 is provided with a guide rib 6011, a guide groove 6012, and a bayonet 6013. The guide rib 6011 and the guide groove 6012 are both extended axially and arranged symmetrically at 180°. The guide rib 6011 is arranged on the rear outer wall of the catheter seat 601, and the guide rib 6011 is guided and matched with the guide groove 104 of the front port of the needle shield 1. The rear end of the guide groove 6012 extends to the rear end surface of the catheter seat 601, and the guide groove 6012 is guided and matched with the guide rib 105 of the front port of the needle shield 1. The bayonet 6013 is arranged on the rear side of the guide rib 6011, and the bayonet 6013 is buckled with the buckle 309 of the elastic cantilever portion 304 of the spring clip 3. In this way, the circumferential and axial locking of the catheter seat 601 is achieved, and the entire catheter seat assembly 6 is installed on the front end of the needle shield 1.

[0115] See also Fig. 20After the catheter seat assembly 6 and the needle protection sleeve 1 are assembled, the process of operating the needle seat 4 to put the indwelling needle in an unused state is as follows: the handle portion 402 of the needle seat 4 is held to drive the needle seat 4 and the needle tube 5 to move forward, so that the needle seat 4 tightly covers the tail of the needle protection sleeve 1, and the needle tip of the needle tube 5 is exposed from the front end of the catheter 603 of the catheter seat assembly 6, and the exposed length of the needle tip meets the standard requirements. Fig. 20 The lower part is an unused indwelling needle.

[0116] See also Fig.21 After the indwelling needle is used, the needle seat 4 is pulled backward to trigger the indwelling needle to self-destruct and the process of removing the catheter seat assembly 6 is as follows: the handle portion 402 of the needle seat 4 is held and drives the needle seat 4 and the needle tube 5 to move backward. When the needle tip of the needle tube 5 exits the eccentric hole 201 of the eccentric baffle 2, the eccentric baffle 2 without the support of the needle tube 5 moves freely in the cavity 101 of the needle protection sleeve 1 until it reaches a balanced state. At this time, the eccentric baffle 2 contacts the inner wall of the cavity 101 of the needle protection sleeve 1 through more than two fulcrums of the outer contour to maintain balance. The eccentric hole 201 of the eccentric baffle 2 is not coaxial with the needle through hole 106 of the needle protection sleeve 1. The solid surface of the eccentric baffle 2 completely blocks the front end of the front section of the needle through hole 106 of the needle protection sleeve 1. The blind hole 202 of the eccentric baffle 2 avoids the needle tip of the needle tube 5 and is introduced into the eccentric hole 201 through the rounded corner. When the needle tip of the needle tube 5 continues to retreat to the rear baffle portion 302 of the spring clip 3, the annular protrusion 502 of the needle tube 5 is blocked by the stop pinhole 306 on the rear baffle portion 302, so that the needle tip of the needle tube 5 is shielded in the needle protection sleeve 1. At this time, the product has entered a self-destruct state and cannot be used anymore. Fig.21 At the bottom part, the elastic cantilever portion 304 of the spring clip 3 recovers its deformation, the buckle 309 at the front end of the elastic cantilever portion 304 is disengaged from the bayonet 6013 of the catheter seat 601, and the catheter seat assembly 6 can be removed from the front end of the needle protection sleeve 1. At this point, the indwelling needle completes self-destruction and is separated from the catheter seat assembly 6.

[0117] The number of the eccentric baffles 2 in this embodiment is one, and the number of the eccentric baffles 2 can be more or less, as long as the function of blocking the front end of the front section of the needle through hole 106 of the needle shield 1 and shielding the needle tip of the needle tube 5 can be achieved. Here is another schematic diagram of three eccentric baffles 2, which have two postures in a balanced state in the cavity 101 of the needle shield 1, see Fig. 22 and Fig.23 . Fig. 22 In the illustrated three eccentric baffles 2 in a balanced state, the center distance between the eccentric hole 201 of the eccentric baffle 2 and the needle through hole 106 of the needle protection sleeve 1 is L1, and the motion trajectory of the eccentric hole 201 is a circle with a radius of R1 (R1=L1); Fig.23In another posture of the three eccentric baffles 2 in a balanced state, the center distance between the eccentric hole 201 of the eccentric baffle 2 and the needle through hole 106 of the needle shield 1 is L2, and the motion trajectory of the eccentric hole 201 is a circle with a radius of R2 (R2=L2). Among them, the diameter of the eccentric hole 201 of the eccentric baffle 2 is d, and the diameter of the needle through hole 106 of the needle shield 1 is D, L1>(D+d) / 2, L2>(D+d) / 2, L1(R1) and L2(R2) can be the same or different. In this way, the eccentric hole 201 of the eccentric baffle 2 will always remain in a state of not intersecting or overlapping with the needle through hole 106 of the needle shield 1 in a balanced state, and the edge of the eccentric hole 201 can shield the needle hole of the needle tube 5. Example 2

[0118] See also Fig.24 , an indwelling needle with an eccentric baffle for shielding a needle, which is different from Example 1 in that the indwelling needle also includes an infusion hose assembly 7, and the infusion hose assembly 7 includes an infusion hose, a hemostatic clamp, an injection and infusion connector, a heparin cap, and an end cap. The infusion hose assembly 7 belongs to the prior art, so the specific structure of each component and the connection relationship between the components are not repeated.

[0119] It should be noted that the fully described invention may also have a variety of variations and modifications, and is not limited to the specific embodiments described above. The above embodiments are merely illustrative of the invention, not limiting thereof. In short, the scope of protection of the invention should include those variations or substitutions and modifications that are obvious to a person of ordinary skill in the art.

Claims

1. An indwelling needle with an eccentric baffle for shielding the needle, characterized in that: include: The needle protection sleeve has a cavity in the front part, a push rod guide hole communicating with the cavity is opened on the lower side of the side wall, a front port communicating with the cavity is opened on the front end surface, and a needle through hole penetrating along the axis is opened in the rear part; An eccentric baffle is installed in the cavity of the needle shield and arranged along the radial surface. The number of the baffle is more than one. The baffle is provided with an eccentric hole. The rear end surface of the baffle is provided with a plurality of blind holes arranged circumferentially on the circumference of the eccentric hole. The outer contour of the baffle is provided with more than two fulcrums. The spring clip comprises a front baffle portion, a rear baffle portion, a connecting portion, and an elastic cantilever portion, wherein the front baffle portion is installed at the front portion of the cavity of the needle shield and limits the axial front position of the eccentric baffle, the front baffle portion is provided with a needle hole coaxial with the needle through hole of the needle shield, the rear baffle portion is installed in the rear portion of the needle shield and divides the needle through hole of the needle shield into two sections, the rear baffle portion is provided with a stop needle hole coaxial with the needle through hole of the needle shield, the connecting portion connects the front baffle portion and the rear baffle portion, the elastic cantilever portion is installed in the needle shield, the rear end of the elastic cantilever portion is connected to the rear baffle portion, the front end of the elastic cantilever portion is provided with a buckle and extends to the front port of the needle shield, and the elastic cantilever portion is pushed upward by the eccentric baffle to generate elastic deformation; A needle seat connected to the rear side of the needle guard; The needle tube, whose rear end extends from the front port of the needle shield, passes through the needle hole of the spring clip, the eccentric hole of the eccentric baffle, the front section of the needle through hole of the needle shield, the stop needle hole of the spring clip, and the rear section of the needle through hole of the needle shield in the axial direction, and is fixed on the needle seat. The front end of the needle tube is the needle tip and is exposed after passing through the catheter seat assembly. The front and rear slots and annular protrusions are arranged near the needle tip. as well as A catheter seat assembly, comprising a catheter seat, a metal wedge, a catheter, and an isolation plug, wherein the rear portion of the catheter seat is installed in the front end of the needle protective sleeve, and a bayonet port is provided on the rear side wall of the catheter seat to match the buckle of the spring clip; The outer diameter of the annular protrusion of the needle tube is larger than the stop pinhole of the spring clip, and smaller than the needle through hole of the needle protective sleeve, the eccentric hole of the eccentric baffle, the pinhole of the spring clip, and the inner hole of the catheter of the catheter seat assembly; When the needle seat is pulled backward, the indwelling needle is triggered to self-destruct, and the needle seat drives the needle tube to retreat axially. When the needle tip of the needle tube exits the eccentric hole of the eccentric baffle, the eccentric baffle that has lost the support of the needle tube moves freely in the cavity of the needle protection sleeve until it reaches a balanced state. At this time, the eccentric baffle contacts the inner wall of the cavity of the needle protection sleeve through more than two fulcrums of the outer contour to maintain balance, and the solid surface of the eccentric baffle completely blocks the front end of the front section of the needle through hole of the needle protection sleeve, and the blind hole of the eccentric baffle avoids the needle tip of the needle tube from entering the eccentric hole. When the needle tip of the needle tube continues to retreat, the annular protrusion of the needle tube is blocked by the stop pinhole of the spring clip, so that the needle tip of the needle tube is shielded in the needle protection sleeve; the elastic cantilever portion of the spring clip recovers its deformation, and the buckle at the front end of the elastic cantilever portion is disengaged from the bayonet of the catheter seat of the catheter seat assembly, and the catheter seat assembly can be removed from the front end of the needle protection sleeve.

2. The indwelling needle with an eccentric baffle for shielding the needle according to claim 1, characterized in that: The front part of the side wall of the cavity of the needle shield is provided with a plurality of stop protrusions arranged along the circumferential direction. After the eccentric baffle is installed from the front end of the needle shield, it is pressed through the outer contour to pass over the stop protrusions on the front part of the cavity side wall and installed into the cavity.

3. The indwelling needle with an eccentric shielding plate according to claim 1, characterized in that: The front port side wall of the needle shield is provided with a guide groove and / or a guide rib, and the rear side wall of the catheter seat of the catheter seat assembly is provided with a guide rib matched with the guide groove and / or a guide groove matched with the guide rib.

4. The indwelling needle with an eccentric baffle for shielding the needle according to claim 1, characterized in that: The side wall of the needle protection sleeve is provided with a front baffle notch communicating with the front part of the cavity, and the front baffle part of the spring clip is installed into the front part of the cavity of the needle protection sleeve through the front baffle notch.

5. The indwelling needle with an eccentric shielding plate according to claim 1, characterized in that: A rear baffle portion slot is provided in the rear portion of the needle protection sleeve, the rear baffle portion of the spring clip is installed in the rear baffle portion slot, and a plurality of first elastic hooks are provided on the rear baffle portion of the spring clip. The first elastic hooks are squeezed in the rear baffle portion slot to provide a force, so that the rear baffle portion of the spring clip is clamped in the rear baffle portion slot.

6. The indwelling needle with an eccentric baffle for shielding the needle according to claim 1, characterized in that: An opening is provided on the left or right side of the side wall of the needle shield, and two connection fixing blocks connected to the internal structure of the needle shield are provided in the opening. The two connection fixing blocks are arranged up and down and have tooth surfaces facing each other. The connection part of the spring clip is installed in the opening, and more than two second elastic hooks are provided on the connection part of the spring clip. The more than two second elastic hooks are pressed against the tooth surfaces of the two connection fixing blocks, so that the connection part of the spring clip is clamped in the opening of the needle shield.

7. The indwelling needle with an eccentric baffle for shielding the needle according to claim 1, characterized in that: An elastic cantilever slot is provided on the upper side of the needle protection sleeve, a plurality of clamping protrusions are provided on the slot wall of the elastic cantilever slot, and the rear part of the elastic cantilever of the spring clip is installed in the elastic cantilever slot and clamped by the clamping protrusions.

8. The indwelling needle with an eccentric shielding plate according to claim 1, characterized in that: The needle seat includes a seat body and a handle. The seat body is provided with an inner hole and a needle fixing hole which are connected front and back along the axis. The seat body covers the rear end of the needle protection sleeve through the inner hole. The rear end of the needle tube is fixed in the needle fixing hole. The handle is connected to the side of the seat body.

9. The indwelling needle with an eccentric shielding plate according to any one of claims 1 to 8, characterized in that: It also includes an infusion hose assembly, which includes an infusion hose, a hemostatic clamp, an infusion connector, a heparin cap, and an end cap.

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