Disclosure of Invention
The present invention addresses the above-described problems by providing an indwelling needle with an eccentric shield.
The aim of the invention can be achieved by the following technical scheme:
An indwelling needle with shielding needle eccentric baffle, comprising:
The needle protecting sleeve has cavity in the front part, push rod guide hole in the lower side of the side wall, front port in the front end surface and needle through hole in the back part;
the eccentric baffle plates are arranged in the cavity of the needle protecting sleeve and are arranged along the radial surface, the number of the eccentric baffle plates is more than 1, eccentric holes are formed in the eccentric baffle plates, a plurality of blind holes circumferentially arranged on the periphery of the eccentric holes are formed in the rear end surface of the eccentric baffle plates, and the outer contour of the eccentric baffle plates is provided with more than 2 fulcrums;
the spring clamping piece comprises a front baffle plate part, a rear baffle plate part, a connecting part and an elastic cantilever part, wherein the front baffle plate part is arranged at the front part of a cavity of the needle protecting sleeve and axially limits the eccentric baffle plate forwards, the front baffle plate part is provided with a needle hole coaxial with a needle through hole of the needle protecting sleeve, the rear baffle plate part is arranged in the rear part of the needle protecting sleeve and separates the needle through hole of the needle protecting sleeve into two sections, the rear baffle plate part is provided with a stop needle hole coaxial with the needle through hole of the needle protecting sleeve, the connecting part is connected with the front baffle plate part and the rear baffle plate part, the elastic cantilever part is arranged in the needle protecting sleeve, the rear end of the elastic cantilever part is connected with the rear baffle plate part, the front end of the elastic cantilever part is provided with a buckle and extends to the front port of the needle protecting sleeve, and the elastic cantilever part is propped upwards by the eccentric baffle plate to generate elastic deformation;
the needle seat is connected to the rear side of the needle protection sleeve;
The needle tube, the back end of which extends from the front end of the needle protecting sleeve, passes through the needle hole of the spring clamping piece, the eccentric hole of the eccentric baffle plate, the front section of the needle through hole of the needle protecting sleeve, the stopping needle hole of the spring clamping piece and the back section of the needle through hole of the needle protecting sleeve in sequence along the axial direction and then is fixed on the needle seat, the front end of the needle tube is a needle point and is exposed after passing through the catheter seat component, the position close to the needle point is provided with a groove hole and an annular bulge which are arranged front and back, and
The catheter seat assembly comprises a catheter seat, a metal wedge, a catheter and a separation plug, wherein the rear part of the catheter seat is arranged in the front end of the needle protection sleeve, and a bayonet matched with the buckle of the spring clamping piece is formed in the side wall of the rear part of the catheter seat;
The outer diameter of the annular bulge of the needle tube is larger than the stop pin hole of the spring clamping piece and smaller than the needle through hole of the needle protecting sleeve, the eccentric hole of the eccentric baffle plate, the pin hole of the spring clamping piece and the inner hole of the catheter seat assembly;
When the needle seat is pulled backwards, the retaining needle is triggered to self-destroy, the needle seat drives the needle tube to withdraw along the axial direction, when the needle point of the needle tube withdraws from the eccentric hole of the eccentric baffle, the eccentric baffle which loses the support of the needle tube moves freely in the cavity of the needle protecting sleeve until reaching an equilibrium state, the eccentric baffle at the moment contacts with the inner wall of the cavity of the needle protecting sleeve through more than 2 supporting points of the outer contour, the solid surface of the eccentric baffle completely blocks the front end of the needle through hole front section of the needle protecting sleeve, the blind hole of the eccentric baffle avoids the needle point of the needle tube to enter the eccentric hole, when the needle point of the needle tube continues to withdraw, the annular bulge of the needle tube is blocked by the stop pin hole of the spring clamping piece, thus the needle point of the needle tube is shielded in the needle protecting sleeve, the elastic cantilever part of the spring clamping piece is deformed in a restoration mode, the buckle at the front end of the elastic cantilever part is in contact with the bayonet of the guide tube seat component, and the guide tube seat component is taken down from the front end of the needle protecting sleeve.
Further, the front part of the side wall of the cavity of the needle protecting sleeve is provided with a plurality of stop protrusions which are arranged along the circumferential direction, and the eccentric baffle plate is arranged in the cavity through the stop protrusions which are extruded by the outer contour and pass over the front part of the side wall of the cavity after being arranged in the front port of the needle protecting sleeve.
Further, the side wall of the front port of the needle protecting sleeve is provided with a guide groove and/or a guide rib, and the side wall of the rear part 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.
Further, a front baffle notch communicated with the front part of the cavity is formed in the side wall of the needle protecting sleeve, and the front baffle of the spring clamping piece is arranged in the front part of the cavity of the needle protecting sleeve through the front baffle notch.
Further, a rear baffle portion clamping groove is formed in the rear portion of the needle protection sleeve, a rear baffle portion of the spring clamping piece is arranged in the rear baffle portion clamping groove, a plurality of first elastic clamping hooks are arranged on the rear baffle portion of the spring clamping piece, and the first elastic clamping hooks are extruded in the rear baffle portion clamping groove to provide acting force, so that the rear baffle portion of the spring clamping piece is clamped in the rear baffle portion clamping groove.
Further, the left side or the right side of needle lag lateral wall has seted up uncovered, be equipped with in the uncovered two connecting portion fixed blocks of being connected with the inner structure of needle lag, two connecting portion fixed block is arranging from top to bottom and face in opposite directions is equipped with the flank of tooth, the connecting portion of spring clamping piece is installed in uncovered, is equipped with the second elasticity pothook more than two on the connecting portion of spring clamping piece, and more than two the second elasticity pothook is pressed and is supported on the flank of tooth of two connecting portion fixed blocks, makes the connecting portion chucking of spring clamping piece in the uncovered of needle lag.
Further, an elastic cantilever part clamping groove is formed in the upper side in the needle protecting sleeve, a plurality of clamping protrusions are arranged on the groove wall of the elastic cantilever part clamping groove, and the rear part of the elastic cantilever part of the spring clamping piece is installed in the elastic cantilever part clamping groove and clamped by the clamping protrusions.
Further, the needle stand comprises a stand body part and a handle part, an inner hole and a needle fixing hole which are communicated with each other along the front and the back of the axis are formed in the stand body part, the stand body part is sleeved at 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 part is connected to the side of the stand body part.
Further, the infusion hose assembly comprises an infusion hose, a hemostatic clip, an infusion connector, a heparin cap and an end cap.
Compared with the prior art, the self-destroying needle has the beneficial effects that the whole structure is compact, the operation is simple, the needle seat is pulled backwards, the needle seat drives the needle tube to retreat along the axial direction, when the needle point of the needle tube retreats from the eccentric hole of the eccentric baffle, the self-destroying of the detained needle is realized, the eccentric baffle which loses the support of the needle tube moves freely in the cavity of the needle protecting sleeve until reaching the balance state, the eccentric baffle at the moment blocks the front end of the front section of the needle through hole of the needle protecting sleeve, the stop needle hole of the spring clamping piece is matched with the annular bulge of the needle tube to limit the needle tube in the axial direction, the needle point of the needle tube is shielded in the needle protecting sleeve, and the safety of products is improved.
Drawings
Fig. 1 is a schematic overall structure of embodiment 1.
Fig. 2 is an exploded structure diagram of embodiment 1.
Fig. 3 is a cross-sectional view of example 1.
FIG. 4 is a schematic structural view of the needle shield in embodiment 1.
FIG. 5 is a schematic perspective sectional view of the needle shield in example 1.
FIG. 6 is another schematic structural view of the needle shield in example 1.
FIG. 7 is a schematic view showing the structure of the front end of the needle shield in example 1.
Fig. 8 is a schematic structural view of an eccentric baffle in embodiment 1.
Fig. 9 is a cross-sectional view of the eccentric blade in embodiment 1.
Fig. 10 is a schematic view of the single eccentric baffle in embodiment 1 in a balanced state.
Fig. 11 is another schematic view of the single eccentric flap in embodiment 1 in a balanced state.
Fig. 12 is a schematic view of a structure of the spring clip in embodiment 1.
Fig. 13 is another structural schematic diagram of the spring clip in embodiment 1.
FIG. 14 is a schematic view showing the assembly process of the needle shield, eccentric baffle, and spring clip of example 1.
Fig. 15 is a sectional view of the needle mount in embodiment 1.
Fig. 16 is a schematic view showing the structure of a needle tube in embodiment 1.
Fig. 17 is a schematic view showing the assembly process of the needle tube and the needle holder in the embodiment 1 and the assembled needle protecting cover, the eccentric baffle and the spring clip.
Fig. 18 is a schematic structural view of the catheter hub assembly in embodiment 1.
Fig. 19 is a schematic view of the structure of the catheter hub in embodiment 1.
Fig. 20 is a schematic view showing the case and needle tube pushed to a desired position by the handle patch of the hand-held case of example 1, so that the indwelling needle is in an unused state.
FIG. 21 is a schematic diagram of the embodiment 1 from the unused state to the self-destructed state.
Fig. 22 is a schematic view of a 3-piece eccentric flap in a balanced state.
Fig. 23 is another schematic view of the 3 eccentric flaps in a balanced state.
Fig. 24 is a schematic overall structure of embodiment 2.
The components in the figures are numbered as follows:
1-needle protective sleeve
101 Cavity
102 Stop projection
103 Ejector pin guide hole
104 Guide groove
105 Guide rib
106-Needle through hole
107 Front baffle notch
108 Rear baffle plate part clamping groove
109 Connecting portion fixed block
110 Elastic cantilever clamping groove
111 Tooth surface
112 Clamping projection
2 Eccentric baffle
201 Eccentric hole
202 Blind hole
203 Fulcrum a
204 Fulcrum b
205 Fulcrum c
3 Spring clip
301 Front baffle portion
302 Tailgate section
303 Connection part
304 Resilient cantilever portion
305 Pinhole
306 Stop pin hole
307 First elastic hook
308 Second elastic hook
309 Buckle
4 Needle stand
401 Seat body
402 Handle portion
403 Inner hole
404-Needle fixing hole
5 Needle tube
501 Slot
502 Annular projection
6 Catheter hub assembly
601 Catheter hub
6011 Guide rib
6012 Guide groove
6013 Bayonet
602 Metal wedge
603 Catheter
604 Isolation plug
7 Transfusion hose assembly
8 Ejector rods.
Detailed Description
The following detailed description of the invention, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a more readily understood understanding of how the invention may be practiced. While the present invention has been described in connection with the preferred embodiments thereof, these embodiments are set forth only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1 to 3, an indwelling needle with a shielding needle eccentric baffle comprises a needle protecting sleeve 1, an eccentric baffle 2, a spring clamping piece 3, a needle seat 4, a needle tube 5 and a catheter seat assembly 6.
Referring to fig. 4 to 7, a cavity 101 is provided in the front portion of the needle protecting sleeve 1, a plurality of stop protrusions 102 circumferentially arranged are provided in the front portion of the side wall of the cavity 101, and a push rod guide hole 103 communicated with the cavity 101 is provided on the lower side of the side wall of the needle protecting sleeve 1.
The front end face of the needle protecting sleeve 1 is provided with a front port communicated with the cavity 101, the side wall of the front port is provided with a guide groove 104 and a guide rib 105 which extend axially, the guide groove 104 and the guide rib 105 are symmetrically arranged at 180 degrees, the front end of the guide groove 104 extends to the front end face of the needle protecting sleeve 1, and the guide rib 105 is arranged on the inner wall of the front port.
A needle through hole 106 penetrating along the axis is arranged in the rear part of the needle protecting 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 communicated with the center of the rear end face of the needle protecting sleeve 1.
The left side or the right side of the side wall of the needle protection sleeve 1 is opened from the cavity 101 to the rear end face, the needle protection sleeve 1 is provided with a spring clamping piece mounting structure, and the spring clamping piece mounting structure comprises a front baffle plate notch 107, a rear baffle plate clamping groove 108, two connecting part fixing blocks 109 and an elastic cantilever clamping groove 110.
The front baffle portion notch 107 is provided at the open front end and communicates with the front portion of the cavity 101. The rear baffle part clamping groove 108 is formed in the rear part of the needle protecting sleeve 1 along the radial surface and is communicated with the opening, and the needle through hole 106 is divided into two sections by the rear baffle part clamping groove 108. The two connecting part fixing blocks 109 are arranged at the front part of the opening and are connected with the internal structure of the needle protecting sleeve 1, the two connecting part fixing blocks 109 are arranged up and down, and tooth surfaces 111 are arranged on opposite surfaces. The elastic cantilever clamping groove 110 is axially arranged at the upper side in the needle protecting sleeve 1 and is communicated with the cavity 101, the opening and the back baffle clamping groove 108, and a plurality of clamping protrusions 112 are arranged on the groove wall of the elastic cantilever clamping groove 110.
Referring to fig. 3, 8 and 9, the eccentric baffle plates 2 are installed in the cavity 101 of the needle protecting sleeve 1 and are arranged along the radial surface, the number of the eccentric baffle plates 2 is more than 1, the eccentric baffle plates 2 are provided with through eccentric holes 201, round corners are arranged along the edges of the eccentric holes 201, the rear end surfaces of the eccentric baffle plates 2 are provided with a plurality of blind holes 202 which are uniformly distributed on the periphery of the eccentric holes 201 along the circumferential direction, and the outer contour of the eccentric baffle plates 5 is provided with more than 2 supporting points.
Wherein, the outline shape, the number of supporting points and the distribution position of the supporting points of the eccentric baffle plate 2 are changeable. 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, respectively, and the eccentric baffle 2 has 2 attitudes in a balanced state in the cavity 101 of the needle shield 1, see fig. 10 and 11.
Referring to fig. 3, 12 and 13, the spring clip 3 is installed in the needle shield 1, and the spring clip 3 includes a front shield portion 301, a rear shield portion 302, a connection portion 303, and an elastic cantilever portion 304.
The front baffle plate 301 is mounted at the front part of the cavity 101 through the front baffle plate notch 107 of the needle protecting sleeve 1, the front baffle plate 301 and the inner structure of the needle protecting sleeve 1 limit the eccentric baffle plate 2 in the front and back directions in the axial direction, and the front baffle plate 301 is provided with a needle hole 305 coaxial with the needle through hole 106 of the needle protecting sleeve 1.
The rear baffle portion 302 is installed in the rear baffle portion clamping groove 108 through the opening of the needle protection sleeve 1, a stop pin hole 306 coaxial with the needle through hole 106 of the needle protection sleeve 1 is formed in the rear baffle portion 302, a plurality of first elastic hooks 307 matched with the rear baffle portion clamping groove 108 are arranged on the rear baffle portion 302, and the first elastic hooks 307 are extruded in the rear baffle portion clamping groove 108 to provide acting force, so that the rear baffle portion 302 is clamped in the rear baffle portion clamping groove 108.
The two ends of the connecting portion 303 are respectively connected with the front baffle portion 301 and the rear baffle portion 302, the connecting portion 303 is arranged along the opening of the needle protecting sleeve 1, more than two second elastic hooks 308 matched with the two connecting portion fixing blocks 109 of the needle protecting sleeve 1 are arranged on the connecting portion 303, and more than two second elastic hooks 308 are pressed against tooth surfaces 111 of the two connecting portion fixing blocks 109, so that the connecting portion 303 is positioned on the opening of the needle protecting sleeve 1.
The rear end of the elastic cantilever part 304 is connected with the rear baffle part 302, the elastic cantilever part 304 is arranged in the needle protection sleeve 1 through the opening of the needle protection sleeve 1, the rear part of the elastic cantilever part 304 is arranged in the elastic cantilever part clamping groove 110 of the needle protection sleeve 1 and is clamped by the clamping bulge 112, the front end of the elastic cantilever part 304 extends to the front end port of the needle protection sleeve 1, the front end of the elastic cantilever part 304 is provided with a buckle 309, and the elastic cantilever part 304 is propped up by the eccentric baffle 2 to generate elastic deformation through the front part.
Referring to fig. 14, the assembly process of the needle shield 1, the eccentric baffle 2 and the spring clip 3 is that the eccentric baffle 2 is firstly installed in the cavity 101 of the needle shield 1, specifically, the eccentric baffle 2 is installed from the front end opening of the needle shield 1, so that the outer contour of the eccentric baffle 2 is extruded over the stop protrusion 102 at the front part of the side wall of the cavity 101, and then is installed in the cavity 101. The spring clip 3 is further installed in the needle protecting sleeve 1, specifically, the front baffle plate 301 of the spring clip 3 is installed at the front part of the cavity 101 from the notch 107 of the front baffle plate of the needle protecting sleeve 1, the rear baffle plate 302 of the spring clip 3 is installed in the rear baffle plate clamping groove 108 from the opening of the needle protecting sleeve 1, the rear baffle plate 302 is clamped in the rear baffle plate clamping groove 108 through the first elastic clamping hook 307, the connecting part 303 of the spring clip 3 is arranged at the opening of the needle protecting sleeve 1, the second elastic clamping hooks 308 arranged in two upper and lower rows are pressed against the tooth surfaces 111 of the two connecting part fixing blocks 109 of the needle protecting sleeve 1, the elastic cantilever part 304 of the spring clip 3 is installed in the needle protecting sleeve 1 from the opening of the needle protecting sleeve 1, the rear part of the elastic cantilever part 304 is installed in the elastic cantilever part clamping groove 110 and clamped by the clamping protrusion 112, and the front part of the elastic cantilever part 304 is arranged at the upper side of the eccentric baffle plate 2.
Referring to fig. 15, the needle holder 4 includes a holder body 401 and a handle 402, wherein an inner hole 403 and a needle fixing hole 404 are formed in the holder body 401, which are communicated with each other along the front and back of the axis, the holder body 401 is sleeved on the rear portion of the needle protecting sleeve 1 through the inner hole 403, the needle fixing hole 404 is used for fixing the rear end of the needle tube 5, and the handle 402 is connected to the side of the holder body 401.
Referring to fig. 16, the front end of the needle tube 5 is a needle tip, a slot 501 and an annular protrusion 502 are disposed at the position of the needle tube 5 near the needle tip and are disposed forward and backward along the axial direction of the needle tube 5, the slot 501 is disposed along the axial direction of the needle tube 5, the annular protrusion 502 is disposed on the outer wall of the needle tube 5 along the circumferential direction in a protruding manner, and the outer diameter of the annular protrusion 502 is larger than the stop pin 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 pin hole 305 of the spring clip 3 and the inner hole of the catheter 603 of the catheter seat assembly 6.
Referring to fig. 17, the assembling process of the needle tube 5, the needle seat 4, the assembled needle protecting sleeve 1, the eccentric baffle 2 and the spring clamping piece 3 is as follows, firstly, the auxiliary tool ejector rod 8 is extended into the ejector rod guide hole 103 of the needle protecting sleeve 1, the ejector rod 8 is operated to jack up the eccentric baffle 2 in the cavity 101, and the eccentric hole 201 of the eccentric baffle 2 is aligned with the needle through hole 106 of the needle protecting sleeve 1. The rear end of the needle tube 5 extends into the front end port of the needle protecting sleeve 1, so that the rear end of the needle tube 5 sequentially penetrates through the needle hole 305 of the spring clamping piece 3, the eccentric hole 201 of the eccentric baffle piece 2, the front section of the needle through hole 106 of the needle protecting sleeve 1, the stop needle hole 306 of the spring clamping piece 3 and the rear section of the needle through hole 106 of the needle protecting sleeve 1 along the axial direction and then extends out of the rear end of the needle protecting sleeve 1. Then, the rear end of the needle tube 5 is inserted into the needle fixing hole 404 through the inner hole 403 of the needle seat 4 and is fixed by environment-friendly quick-drying glue. At this time, the auxiliary tool ejector pin 8 is removed, and the needle tube 5 supports the eccentric baffle 2 upward against the front portion of the elastic cantilever portion 304 of the spring clip 3, so that the elastic cantilever portion 304 is kept elastically deformed.
Referring to fig. 18, the catheter hub assembly 6 includes a catheter hub 601, a metal wedge 602, a catheter 603, and a spacer 604, wherein the metal wedge 602 and the spacer 604 are mounted in the catheter hub 601, the front portion of the catheter 603 extends from the front end of the catheter hub 601, and the rear end of the catheter 603 is fixed to the metal wedge 602.
Referring to fig. 3 and 19, the rear portion of the catheter holder 601 is mounted in the front end of the needle protection sleeve 1, a guide rib 6011, a guide groove 6012 and a bayonet 6013 are arranged on the side wall of the rear portion of the catheter holder 601, the guide rib 6011 and the guide groove 6012 extend along the axial direction and are symmetrically arranged at 180 degrees, the guide rib 6011 is arranged on the outer wall of the rear portion of the catheter holder 601, the guide rib 6011 is in guide fit with a guide groove 104 of the front port of the needle protection sleeve 1, the rear end of the guide groove 6012 extends to the rear end face of the catheter holder 601, the guide groove 6012 is in guide fit with a guide rib 105 of the front port of the needle protection sleeve 1, the bayonet 6013 is arranged on the rear side of the guide rib 6011, and the bayonet 6013 is in snap fit with a buckle 309 of an elastic cantilever part 304 of the spring clamping piece 3, so that circumferential and axial locking of the catheter holder 601 is achieved, and the whole catheter holder assembly 6 is mounted on the front end of the needle protection sleeve 1.
Referring to fig. 20, after the catheter hub assembly 6 is assembled with the needle protecting sleeve 1, the process of operating the needle hub 4 to enable the indwelling needle to be in an unused state is that the handle 402 of the hand-held needle hub 4 drives the needle hub 4 and the needle tube 5 to move forwards, so that the needle hub 4 tightly covers the tail of the needle protecting sleeve 1, the needle tip of the needle tube 5 is exposed from the front end of the catheter 603 of the catheter hub assembly 6, and the exposed length of the needle tip meets the standard requirement. The lower part of fig. 20 is an indwelling needle in an unused state.
Referring to fig. 21, after the indwelling needle is used, the process of pulling the needle holder 4 backwards to trigger the indwelling needle to self-destroy and detach the catheter holder assembly 6 is as follows, the handle 402 of the needle holder 4 is held by hand to drive the needle holder 4 and the needle tube 5 to move backwards, when the needle tip of the needle tube 5 exits the eccentric hole 201 of the eccentric baffle 2, the eccentric baffle 2 which loses the support of the needle tube 5 moves freely in the cavity 101 of the needle shield 1 until reaching an equilibrium state, at this time, the eccentric baffle 2 contacts with the inner wall of the cavity 101 of the needle shield 1 through more than 2 supporting points of the outer contour to keep equilibrium, the eccentric hole 201 of the eccentric baffle 2 is not coaxial with the needle through hole 106 of the needle shield 1, the solid surface of the eccentric baffle 2 completely shields the front end of the front section of the needle through hole 106 of the needle tube 1, and the needle tip of the blind hole 202 5 of the eccentric baffle 2 is led into the eccentric hole 201 by chamfering. When the needle tip of the needle tube 5 continues to retreat to the back baffle plate part 302 of the spring clamping piece 3, the annular protrusion 502 of the needle tube 5 is blocked by the stop needle hole 306 on the back baffle plate part 302, so that the needle tip of the needle tube 5 is shielded in the needle protecting sleeve 1, and at the moment, the product is in a self-destruction state and cannot be used any more. Referring to the lowermost part of fig. 21, the elastic cantilever portion 304 of the spring clip 3 is restored to be deformed, the buckle 309 at the front end of the elastic cantilever portion 304 is disengaged from the bayonet 6013 of the catheter hub 601, and the catheter hub assembly 6 can be removed from the front end of the needle protecting cover 1, so that the indwelling needle is self-destructed and the catheter hub assembly 6 is separated.
The number of the eccentric baffles 2 in this embodiment is 1, and the number of the eccentric baffles 2 may 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. This is further given by a schematic view of 3 eccentric flaps 2, the 3 eccentric flaps 2 having 2 attitudes in the equilibrium state within the cavity 101 of the needle shield 1, see fig. 22 and 23. In one posture of the 3-piece eccentric fence 2 in the balanced state shown in fig. 22, the center distance between the eccentric hole 201 of the eccentric fence 2 and the needle through hole 106 of the needle shield 1 is L1, the movement locus of the eccentric hole 201 is a circle with a radius R1 (r1=l1), and in the other posture of the 3-piece eccentric fence 2 in the balanced state shown in fig. 23, the center distance between the eccentric hole 201 of the eccentric fence 2 and the needle through hole 106 of the needle shield 1 is L2, the movement locus of the eccentric hole 201 is a circle with a radius R2 (r2=l2). Wherein the diameter of the eccentric hole 201 of the eccentric baffle 2 is D, the diameter of the needle through hole 106 of the needle protecting sleeve 1 is D, L1> (D+d)/2, L2> (D+d)/2, L1 (R1) and L2 (R2) can be the same or different. Thus, the eccentric hole 201 of the eccentric flap 2 is kept in a state of non-intersecting and non-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
Referring to fig. 24, an indwelling needle with an eccentric blocking piece of a shielding needle is different from embodiment 1 in that the indwelling needle further comprises an infusion hose assembly 7, the infusion hose assembly 7 comprises an infusion hose, a hemostatic clip, an infusion connector, a heparin cap and an end cap, and the infusion hose assembly 7 belongs to the prior art, so that specific structures of all components and connection relations among the components are not repeated.
It should be noted that numerous variations and modifications are possible in light of the fully described invention, and are not limited to the specific examples of implementation described above. The above-described embodiments are merely illustrative of the present invention and are not intended to be limiting. In general, the scope of the present invention should include those variations or alternatives and modifications apparent to those skilled in the art.