WO2014032284A1

WO2014032284A1 - Automatically withdrawing open remaining needle with telescopic protective jacket

Info

Publication number: WO2014032284A1
Application number: PCT/CN2012/080867
Authority: WO
Inventors: 陈永曦
Original assignee: 福建省百仕韦医用高分子股份有限公司
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2014-03-06

Abstract

Disclosed is an automatically withdrawing open remaining needle with telescopic protective jacket which is suitable for intravascular medical apparatus, wherein the protective jacket (5) of the needle tubing is a telescopic connecting jacket comprising an outer jacket (51) and an inner jacket (52) arranged together, wherein both of the top of the front end of the outer jacket and the top of the rear end of the inner jacket are installed with check back steps (53),and front end wall of the outer jacket lumen contradicts the front end of the compression spring (6). Substituting the integrated jacket in the prior art with a telescopic jacket which has a shorter length and convenient operation; the use of the elastic convex card (514) ensures that the needle tubing (1) no longer stretches out once retreated into the protective jacket (5) of the needle tubing, so as to avoid hurting people and environmental pollution; the setting of the brake member (7) makes operation of the automatically withdrawing needle convenient and hard to misoperate; the setting of rolling stopper (25) not only prevents relative rolling between the needle tubing (1) and the outer jacket (51) affecting the examination when examining the gap between the needle tubing and the tube, but also prevents relative rolling between the needle file (2) and the outer jacket(51) when the needle file retreats, and thereby avoids the disturbance of the withdrawal of the needle by rolling.

Description

Automatic needle-opening indwelling needle with telescopic protective sleeve

技术领域Technical field

The invention relates to a medical device suitable for intravascular, in particular to an automatic needle-opening indwelling needle with a telescopic protective sleeve, which can also be applied to a closed indwelling needle after reasonable modification.

背景技术 Background technique

Chinese invention patent 2011202478927 discloses an "open needle for automatic needle withdrawal" which is composed of a needle tube assembly, a catheter assembly and a needle withdrawal device. Referring to Figure 1, the catheter assembly includes a flexible catheter 3 and a catheter hub 4 coupled to one end of the catheter 3. The needle cannula assembly includes a needle cannula 1 and a needle hub 2 that is inserted through the catheter hub 4 into the lumen of the catheter 3 and exposes the needle tip. The needle withdrawal device includes a needle tube sheath 5, a compression spring 6, and a brake member 7. The rear part of the needle seat is sleeved in the inner cavity of the needle sheath, the diameter of the needle seat exposed outside the sheath of the needle tube is smaller than the diameter of the inner cavity of the sheath of the needle tube, and a step for locking is arranged on the concave portion, and the brake member is disposed on the brake member. There are two mutually communicating holes, the diameter of the small holes matching the diameter of the step of the step and smaller than the diameter of the portion of the needle seat before the step, the diameter of the large hole being larger than the diameter of the step of the step and the needle seat before the step The diameter of the passage, the brake member is movably inserted outside the step, the compression spring is located in the inner cavity of the needle sheath and surrounds the periphery of the corresponding needle seat portion, and one end thereof is in contact with the front end wall of the inner wall of the needle sheath sheath, The other end is in contact with the one end surface of the rear portion of the needle seat. Due to the spring preloading force, the front and rear walls of the small hole of the brake member respectively correspond to the stepped elevation surface of the locking step and the front end wall of the needle sheath. The interference locks the retraction of the needle seat, and the large hole that moves the brake member aperture away from the locking step and continues to enter releases the interference, and the front portion of the needle seat is retracted into the inner cavity of the needle sheath. In order to accommodate the full length of the needle holder and the needle tube, the needle tube sheath is made longer than the full length needle holder and the needle tube. This double or more full length needle holder and the indwelling needle of the needle tube must be affected by the length.

发明内容 Summary of the invention

The object of the present invention is to provide an automatic needle-opening indwelling needle with a telescopic protective sleeve with a short length and convenient operation according to the deficiencies of the prior art.

The object of the present invention is achieved by the following means:

An automatic needle-opening indwelling needle having a telescopic protective sleeve, including a needle tube assembly, a catheter assembly, and a needle removing device; the catheter assembly includes a flexible catheter and a catheter hub coupled to one end of the catheter; the needle assembly includes a needle tube and a needle hub, the needle tube Inserting through the catheter hub into the catheter core cavity and exposing the needle tip; the needle removal device comprises a needle sheath, a compression spring and a brake member,

The rear part of the needle seat is sleeved in the inner cavity of the needle sheath, the diameter of the needle seat exposed outside the sheath of the needle tube is smaller than the diameter of the inner cavity of the sheath of the needle tube, and a step for locking is arranged on the concave portion, and the brake member is disposed on the brake member. There are two mutually communicating holes, the diameter of the small holes matching the diameter of the step of the step and smaller than the diameter of the portion of the needle seat before the step, is the lock hole of the needle seat, and the diameter of the large hole is larger than the diameter of the step of the step And the diameter of the needle seat section before the step is a needle seat passage hole, and the brake member is movably inserted outside the step

The compression spring is located in the inner cavity of the needle sheath and surrounds the periphery of the corresponding needle seat, the front end of the compression spring is in contact with the front end wall of the needle sheath inner cavity, and the rear end is in contact with the end surface of the rear part of the needle seat, due to the spring preload The action of the force, the front wall of the small hole of the brake member corresponds to the stepped elevation of the locking step, the interference locks the retreat of the needle seat, and the small hole of the moving brake member is separated from the locking step and the large hole that continues to enter is released. In this kind of interference, the front part of the needle seat can be retracted into the inner cavity of the needle tube sheath, and the main point of the composition is that the needle tube sheath is a telescopic joint sleeve, including the jacket and the inner sleeve which are put together, the front end of the outer sleeve and the inner sleeve The rear end heads are all provided with a stop step, the front end wall of the outer casing is in contact with the front end of the compression spring, and the rear part of the needle seat which is in contact with the rear end of the compression spring is located in the inner cavity of the inner sleeve, and is retracted backward. The sleeve finally achieves the hooking of the two retreating steps and is stopped.

In this way, the full length of the needle holder and the needle tube can be accommodated, and the length of the entire indwelling needle can be shortened, which facilitates the operation.

The object of the present invention can also be achieved by the following means.

There is a distance between the rear end of the hub and the rear end wall of the inner sleeve.

With this distance, the retracted needle seat slides in the inner cavity of the inner sleeve under the action of the spring pre-tightening force, and then slides to a certain distance and then touches the rear end wall of the inner sleeve, and then the backward needle The seat drives the inner sleeve to continue to slide backward relative to the outer sleeve.

Before the tail step of the jacket is provided with a one-way locking elastic convex card, after the elastic sleeve is climbed back to the retracted inner sleeve, the front end wall of the outer sleeve is in contact with the rear end of the elastic retractable elastic convex card.

In this way, the inner sleeve that is retracted into position cannot be advanced, thereby ensuring that the needle tube retracted into the sheath of the needle tube does not protrude any more, and does not injure people or pollute the environment.

This one-way locking elastic cam has many options in the prior art. Here's an optimization:

The elastic convex card is an elastic tongue formed by forming a U-shaped groove on the side wall of the tail end of the outer casing, the tongue end is backward, the tongue surface has a slope or a curved surface which is easy to climb, and the tongue end wall has the inner side. The abrupt structure of the front wall clamp.

The abutment configuration can be a vertical face or a tip end that projects rearward.

There are two elastic convex cards mentioned above, which are symmetrically distributed along the circumferential direction of the outer casing.

The brake member comprises a one-piece body, wherein the large hole and the small hole are disposed on the main body, and the two holes intersect to form a gourd shape, and the front end portion of the outer sleeve is provided with a vertical direction from the outer casing and penetrates from the upper peripheral wall. To the sliding groove of the lower peripheral wall, the sheet-like main body is inserted in the sliding groove.

Thus, by sliding the sheet-like body, the selection of the small hole blocking lock and the large hole release can be performed.

The brake member further includes a stopping protrusion located under the sheet body or integrally formed with or fixed to the sheet body, and the front end of the casing is provided with a stopping groove which penetrates the upper and lower peripheral walls of the outer casing up and down The front side is located on the front end surface of the outer sleeve and is open, and the rear side is open and open to the sliding groove, but the width of the stopping groove is narrower than the width of the sliding groove, and the width matches the width of the stopping protrusion, and the small hole is in the blocking state. The stop lug and the retaining groove are connected in an interference or transition fit manner.

If the interference fit is selected, the interference should not be too large, otherwise the retarding force is too large; if the transition fit is selected, it should not be too loose, otherwise the blocking force will not be formed.

This interference or transition fit connection creates a block on the sheet-like body in the sliding groove so that it does not slip directly due to external forces. However, the blocking force formed by this type of interference or transition fit mode should not be too large, otherwise it will affect the operation. In the prior art, a material having a certain elastic deformation is usually selected to make a stopper bump.

The contact bump and the contact portion on both sides of the retaining groove have a convex shape, and the periphery of the bump has a circular arc shape.

The smaller bump structure can easily form a snap, and under a small downforce, the snap can be easily broken and moved down.

The brake member further includes a grip portion located above the sheet-like body and perpendicularly intersecting the sheet-like body, the grip portion having an arc shape matching the fingers.

As the name implies, this grip is used as a part for finger pressing.

The outer peripheral surface of the needle hub is matched with the corresponding portion of the inner wall of the outer sleeve to provide a rotation preventing structure for preventing relative rotation of the needle seat relative to the outer sleeve. The rotation preventing structure comprises a rotation preventing positioning plane extending axially on the outer circumferential surface of the needle seat and Matching the plane of rotation of the inner wall of the outer casing.

The two non-rotation planes are matched to the contact, so that the needle holder can be prevented from rotating relative to the outer sleeve. The purpose is to hold the outer sleeve and the catheter seat relative to each other before the indwelling operation, so that the needle tube is rotated relative to the catheter to check the gap between the needles. At the same time, with this anti-rotation configuration, the needle holder does not rotate relative to the outer sleeve when the needle seat starts to retreat, thereby avoiding the interference of the rotation on the needle withdrawal.

There are two rotation stop structures described above, which are symmetrically distributed in the circumferential direction.

In summary, the present invention has the following advantages over the prior art: replacing the integrated sleeve in the prior art with a telescopic sleeve, the length is short, and the operation is convenient; the intervention of the elastic convex card ensures retraction into the sheath of the needle tube The needle tube will not stick out again, it will not hurt or pollute the environment; the special innovative setting of the brake component makes the automatic needle removal operation convenient and not easy to operate incorrectly; the innovative setting of the rotation stop structure not only checks the needle tube and the catheter The gap can prevent the needle tube from being affected by the rotation of the outer sleeve, and the needle seat can be prevented from rotating relative to the outer sleeve when the needle seat is retracted, thereby avoiding the interference of the rotation on the needle withdrawal.

附图说明 DRAWINGS

1 is a schematic view showing the structure of an open indwelling needle for automatic needle withdrawal in the prior art.

2 is a schematic perspective view showing the structure of an automatic needle-opening indwelling needle having a telescopic protective sleeve according to the first embodiment of the present invention.

Figure 3 is an enlarged cross-sectional view of the portion A in Figure 2;

Figure 4 is a left side view of Figure 3.

Fig. 5 is a schematic perspective view showing the structure of a needle tube assembly in the first embodiment.

Fig. 6 is a schematic perspective view showing the structure of the outer casing of the first embodiment.

Figure 7 is a schematic front cross-sectional view showing the structure of the outer casing of the first embodiment.

Figure 8 is a schematic left side view showing the structure of the outer casing of the first embodiment.

Figure 9 is a schematic front cross-sectional view showing the structure of the inner sleeve in the first embodiment.

Figure 10 is a schematic front cross-sectional view showing the structure of the hub of the first embodiment.

Figure 11 is a schematic left cross-sectional view showing the structure of the hub of the first embodiment.

Figure 12 is a schematic front cross-sectional view showing the structure of a brake member in the first embodiment.

Figure 13 is a schematic left side view showing the structure of the brake member in the first embodiment.

Fig. 14 is a schematic perspective view showing the state after the automatic withdrawal of the needle in the first embodiment.

Fig. 15 is a view showing the position of the brake member in the state of automatic withdrawal in the first embodiment.

Figure 16 is a schematic perspective view showing the structure of an automatic needle-opening indwelling needle having a telescopic protective sleeve in an automatic needle-removing state in a preferred embodiment of the present invention.

Label description:

1 needle tube 2 needle seat 21 blood return chamber 22 vent plug 23 groove 24 front step

25 rotation stop positioning plane 3 conduit 4 conduit seat 5 needle seat sheath 51 jacket 511 sliding groove 512 stop groove 513 stop plane 514 elastic convex card 515 operating part 52 inner sleeve 53 stop step 6 compression spring 7 brake member 71 sheet body 711 small hole 712 large hole 72 stop projection 73 holding portion

The invention will now be described in greater detail with reference to the drawings.

具体实施方式 detailed description

Embodiment 1:

Referring to Figures 2 and 14, an automatic needle-opening indwelling needle having a telescopic protective sleeve includes a needle cannula assembly, a catheter assembly, and a needle removal device. The catheter assembly includes a flexible catheter 3 and a catheter hub 4 coupled to one end of the catheter 3. The needle cannula assembly includes a needle cannula 1 and a needle hub 2 that is inserted through the catheter hub 4 into the lumen of the catheter 3 and exposes the needle tip. The needle withdrawal device includes a needle tube sheath 5, a compression spring 6, and a brake member 7. The rear of the needle hub 2 is placed in the lumen of the needle cannula 5. The needle tube sheath 5 is a telescopic joint sleeve, including a jacket 51 and an inner sleeve 52 which are put together, and the front end of the outer sleeve 51 and the front end of the inner sleeve 52 are provided with a stop step 53 and a sleeve 52 which is retracted backward. Finally, the overlap of the two retreating steps 53 is achieved and is stopped, and the rear of the hub 2 nested in the inner cavity of the needle sheath 5 is located in the inner cavity of the inner sleeve 52.

Referring to Figures 5, 10, and 11, the rear end of the needle tube 1 is inserted into the needle hub 2, and the needle core communicates with the blood return chamber 21 at the rear of the needle holder 2, and the rear end of the blood return chamber 21 is permeable and airtight. Plug 22. The outer peripheral surface of the needle hub 2 is a stepped shaft, and the front stepped shaft and the middle stepped shaft are large but the diameter is smaller than the rear stepped shaft. A groove 23 is formed between the front stepped shaft and the middle stepped shaft, and the groove 23 forms a front step 24 and a rear step, wherein the front step 24 serves as a step for locking, and the diameter of the bottom of the recess 23 is also The diameter of the stepped locking step is the diameter of the stepped shaft, and the diameter of the front stepped shaft is also the stepped diameter of the locking step. The outer peripheral surfaces of the front step shaft and the middle step shaft of the needle hub 2 are symmetrically disposed with two rotation preventing positioning planes 25 extending along the axial direction of the front step shaft and the middle step shaft, and the inner cavity of the outer casing 51 The corresponding stop plane on the wall matches the contact.

Referring to Figures 12 and 13, the brake member 7 is made of a plastic having a little elasticity, and includes a sheet-like body 71, a stopper projection 72, and a pressing portion 73. The sheet-like body 71 is provided with a A large hole 712 and a small hole 711, the two holes intersect to form a gourd shape. The stopping protrusion 72 is located below the sheet-like main body 71 and is integrally formed with the sheet-like main body 71. The portion where the stopping protrusion 72 and the stopping groove 512 are in contact with each other has a convex shape, and the periphery of the protruding point is an arc. shape. The pressing portion 73 is located above the sheet-like main body 71 and perpendicularly intersects the sheet-like main body 71, and the surface of the pressing portion 73 has an arc shape matching the fingers.

Referring to FIG. 6, FIG. 7, and FIG. 8, the outer casing 51 is a hollow cylindrical body, and the central core is a stepped hole, and the front hole is slightly smaller for being sleeved with the corresponding portion of the needle seat 2, and the rear hole is longer and longer. Used to nest the inner sleeve 52. The front end portion is provided with a sliding groove 511 which is perpendicular to the axial direction of the outer casing and penetrates from the upper peripheral wall to the lower peripheral wall. The front end of the outer sleeve is provided with a stopping groove 512. The stopping groove 512 extends up and down through the upper and lower peripheral walls of the outer casing, the front side is located at the front end surface of the outer casing and is open, and the rear side is open and open to the sliding groove 511, but the width of the stopping groove 512 is wider. The sliding groove 511 has a narrow width and the width matches the width of the stopper projection 72. The inner wall of the front core hole of the rear side of the sliding groove 511 is symmetrically disposed with a rotation preventing plane 513 which matches and contacts the corresponding rotation preventing positioning plane on the outer peripheral wall of the needle hub 2. The rear end of the rear hole of the outer casing 51 is recessed in a step and serves as a stop step 53. Before the stop step 52, a resilient convex card 514 is disposed. The elastic convex card 514 is formed on the side wall of the outer sleeve 51 to form a U-shaped groove to form a resilient tongue. The tongue end is backward, and the tongue surface is convenient for climbing. The oblique curved surface, the tongue end wall is a vertical surface to form a type of abutment for engaging with the front end wall of the inner sleeve 52 to prevent the inner sleeve from being retracted into position and not being advanced. The outer peripheral surface of the front portion of the outer casing 51 is symmetrically provided with a grip portion 515 for facilitating hand-holding.

Referring to Fig. 9, the inner sleeve 52 is a hollow cylindrical body having a stepped outer peripheral surface, and the slightly projecting step is located at the front end head and serves as a retreating step 53 for a corresponding retreating step 53 with the rear end of the outer sleeve. Match the touch. The hole through which the core penetrates is used to mount the hub 2, and the hub 2 can also slide therein.

Referring to FIGS. 2, 3, 4, and 14, the front step shaft before the groove on the needle seat 2 is exposed outside the outer casing 51, and the front half of the groove and the rear middle step shaft are sleeved in front of the outer casing 51. In the hole, the middle step shaft and the rear step shaft thereafter are located in the inner sleeve inner cavity, and the rear end head of the rear step shaft has a distance from the rear end wall of the inner sleeve. When the sliding groove 511 on the outer casing 51 and the groove 2 are in the overlapping state, the sheet-like main body 71 of the braking member is inserted into the sliding groove 511 from the top to the bottom with the stopping projection 72 at the bottom thereof. In the movement groove 512, the small hole 711 located at the lower half of the sheet-like main body 71 is in contact with the locking step formed by the groove, and the diameter of the small hole 711 matches the diameter of the step of the step and is smaller than the needle seat before the step. The diameter of the passage (i.e., the diameter of the front stepped shaft) is the needle lock hole; the diameter of the large hole 712 located in the upper half of the sheet-like body 71 is larger than the diameter of the step and the diameter of the throat portion before the step. (and the diameter of the front stepped shaft) is a needle through hole. At this time, the large hole 712 is still in a suspended state that does not correspond to the locking step and the needle seat 2, and the small hole 711 is in contact with the locking step. The blocking latching state, at this time, the locking projection 72 achieves an interference fit connection with the retaining groove 512 with a slight elastic deformation.

The compression spring 6 is located in the inner cavity of the inner sleeve 52 and surrounds the periphery of the corresponding portion of the rear half of the step shaft in the needle seat 2, the front end of which is in contact with the front end wall of the outer sleeve 51, and the rear end is in contact with the step shaft in the needle seat 2 The step surface between the stepped shaft and the rear stepped shaft is located in the inner cavity of the inner sleeve 52. The front wall of the brake member small hole 711 and the front step 24 of the needle seat 2 are correspondingly interfered by the spring preloading force. The interference locks the back of the needle seat. In this connection state, the rotation preventing positioning plane 25 on the needle hub 2 should be correspondingly contacted with the rotation preventing plane 513 on the outer casing 51, that is, when the needle holder 2 is inserted into the outer casing 51, the two rotation planes are aligned. .

14 and 15, when the needle is withdrawn, the pressing portion 73 of the braking member 7 is pressed downward, the sheet-like main body 71 is displaced downward, and the large hole 712 which is separated from the locking step and continues to enter is larger than the diameter of the large hole 712. The diameter of the front stepped shaft of the needle seat no longer forms a resistance to the front step 24. Under the action of the spring preloading force, the needle seat can be retracted, and the rear part of the needle seat 2 slides first in the inner sleeve inner cavity, and then slides a certain distance and then The rear end wall of the sleeve touches, and thereafter, the backward needle seat drives the inner sleeve to continue to slide backward relative to the outer sleeve until the needle tube and the needle seat are all retracted into the inner cavity of the outer sleeve 51 and the inner sleeve 52. The reclining inner sleeve first climbs over the elastic convex card 514 at the tail of the outer sleeve 51 and the front end wall thereof is in contact with the rear end of the elastically retractable elastic convex card 514, and the front end of the inner sleeve 52 has the retaining step 53 and the outer sleeve. The back end step 51 of the 51 rear end head is hooked.

The parts not described in this embodiment are the same as the prior art.

Best embodiment:

Referring to Fig. 16, an automatic needle-opening indwelling needle having a telescopic protective sleeve, on the basis of the first embodiment, a soft connecting tube 81, an infusion joint 82 and a dressing 83 are added, and these are added in the prior art. I will not repeat them here.

The parts not described in this embodiment are the same as those in the first embodiment.

Claims

Automatic needle-opening indwelling needle with telescoping sleeve, including needle assembly, catheter assembly and needle removal device The catheter assembly includes a flexible catheter and a catheter hub coupled to one end of the catheter, the needle assembly including a needle tube and a needle hub inserted through the catheter hub into the catheter core lumen and exposing the needle tip, The needle removal device includes a needle tube sheath, a compression spring and a brake member. The rear part of the needle seat is sleeved in the inner cavity of the needle sheath, the diameter of the needle seat exposed outside the sheath of the needle tube is smaller than the diameter of the inner cavity of the sheath of the needle tube, and a step for locking is arranged on the concave portion, and the brake member is disposed on the brake member. There are two mutually communicating holes, the diameter of the small holes matching the diameter of the step of the step and smaller than the diameter of the portion of the needle seat before the step, is the lock hole of the needle seat, and the diameter of the large hole is larger than the diameter of the step of the step And the diameter of the needle seat section before the step is a needle seat passage hole, and the brake member is movably inserted outside the step

The compression spring is located in the inner cavity of the needle sheath and surrounds the periphery of the corresponding needle seat, the front end of the compression spring is in contact with the front end wall of the needle sheath inner cavity, and the rear end is in contact with the end surface of the rear part of the needle seat, due to the spring preload The action of the force, the front wall of the small hole of the brake member corresponds to the stepped elevation of the locking step, the interference locks the retreat of the needle seat, and the small hole of the moving brake member is separated from the locking step and the large hole that continues to enter is released. This kind of resistance, the front of the needle seat can be retracted into the lumen of the needle sheath,

The utility model is characterized in that: the needle tube sheath is a telescopic joint sleeve, which comprises a jacket and an inner sleeve which are put together, and the front end head of the outer sleeve and the rear end of the inner sleeve are provided with a stop step, which is in contact with the front end of the compression spring. The front end wall of the inner cavity of the outer casing, and the rear part of the needle seat which is in contact with the rear end of the compression spring is located in the inner cavity of the inner sleeve, and the inner sleeve which is retracted backward finally achieves the hooking of the two retreating steps and is stopped.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein the rear end of the needle hub has a distance from the rear end wall of the inner sleeve.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein a one-way locking elastic convex card is arranged before the tail step of the outer casing, and the inner sleeve is retracted backwards. After the elastic convex card, the front end wall is in contact with the rear end of the elastically retractable elastic convex card.
The automatic needle-opening indwelling needle with a telescopic protective cover according to claim 3, wherein the elastic convex card is a resilient tongue formed by forming a U-shaped groove on the side wall of the tail end of the outer casing. The tongue end faces backward, and the tongue surface has a slope or a curved surface which is easy to climb, and the tongue end wall has a protruding structure which is in contact with the front end wall of the inner sleeve.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 4, wherein the protruding structure can be a vertical surface or a tip end projecting backward.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 4, wherein the elastic convex cards have two in total and are symmetrically distributed along the circumferential direction of the outer casing.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein the braking member comprises a one-piece body, and the large hole and the small hole are disposed on the body, and two The holes intersect to form a gourd shape, and the front end portion of the outer sleeve is provided with a sliding groove perpendicular to the axial direction of the outer casing and penetrating from the upper peripheral wall to the lower peripheral wall, and the sheet-like main body is inserted in the sliding groove.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein the braking member further comprises a stopping protrusion located under the sheet-like body or integrally formed with the sheet-like body or The front end of the outer sleeve is provided with a retaining groove. The retaining groove extends up and down through the upper and lower peripheral walls of the outer sleeve, the front side is located at the front end surface of the outer sleeve and is open, and the rear side is open and open to the sliding groove, but the width of the retaining groove is wider. The width of the sliding groove is narrow and the width matches the width of the stopping projection. When the small hole is in the blocking locking state, the stopping protrusion and the stopping groove are connected in an interference or transition fit manner.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 8, wherein the portion of the stopping protrusion that contacts the two sides of the stopping groove has a convex shape, and the periphery of the protruding point is semi circle.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein the braking member further comprises a pressing portion located above the sheet-like body and with the sheet-like body Vertically intersecting, the surface of the holding portion has an arc that matches the fingers.
The automatic needle-opening indwelling needle with a telescopic protective sleeve according to claim 1, wherein the outer peripheral surface of the needle seat and the corresponding portion of the inner wall of the outer sleeve are matched with a rotation preventing the relative rotation of the needle holder relative to the outer sleeve. The rotation preventing configuration includes a rotation preventing positioning plane extending in the axial direction on the outer circumferential surface of the needle hub and a rotation preventing plane of the casing inner cavity wall matched thereto.
The automatic needle-opening indwelling needle having a telescopic protective cover according to claim 11, wherein the rotation preventing structure has two in total and is symmetrically distributed in the circumferential direction.