CN110678214B

CN110678214B - Safety open type remaining needle with front extending needle rod

Info

Publication number: CN110678214B
Application number: CN201780090653.5A
Authority: CN
Inventors: 陈永曦
Original assignee: Fujian Bestway Medical Polymer Corp
Current assignee: Fujian Bestway Medical Polymer Corp
Priority date: 2017-05-15
Filing date: 2017-05-15
Publication date: 2021-09-10
Anticipated expiration: 2037-05-15
Also published as: WO2018209498A1; CN110678214A

Abstract

A safety open type indwelling needle with a front extending needle rod is characterized in that a catheter seat is provided with a front inner cavity and a rear inner cavity, a catheter is inserted into the front inner cavity, a needle seat comprises a front section and a rear section, the front section is sleeved in the rear inner cavity of the catheter seat, the rear section of the needle seat is exposed out of the catheter seat, the rear end of a needle tube (3.3) is inserted into the needle seat, an inner cavity hole of the needle tube (3.3) is communicated with a blood returning cavity of the rear section of the needle seat, the needle tube (3.3) sequentially penetrates through the inner cavity of the catheter seat and the front end of the catheter, the needle point is exposed out of the tip of the catheter, the front section of the needle seat is in a long rod shape, the front section of the needle seat extends forwards from the rear end face of the catheter seat and is inserted into or close to a joint part of the front and rear inner cavities of the catheter seat, and the insertion depth is more than three quarters of the length of the rear inner cavity of the catheter seat. The remaining needle has the following advantages: the needle tube (3.3) has relatively low material strength and manufacturing process requirements, is convenient to use, has a short protective sleeve, is convenient to operate, has a simple structure and is convenient to manufacture.

Description

Safety open type remaining needle with front extending needle rod

Technical Field

The invention relates to an indwelling needle, in particular to a safety open indwelling needle with a front needle extension rod.

Background

An open type indwelling needle in the prior art is shown in figure 1 and comprises a catheter component 1 and a puncture component 2, wherein the puncture component is composed of a puncture needle tube 2.1 and a needle seat 2.2, and the catheter component 1 is composed of a catheter and a catheter seat. The catheter hub has a front lumen in which the catheter is inserted and a rear lumen. The needle tube sequentially passes through the rear inner cavity and the front inner cavity of the catheter component and finally penetrates out of the front end of the catheter, the needle tip is exposed out of the tip end of the catheter, the rear end of the needle tube is inserted into the needle seat, the inner cavity hole of the needle tube is communicated with the blood return cavity at the rear section of the needle seat, the short frustum at the front end of the needle seat is inserted into the tail section of the rear inner cavity of the catheter component, the depth of the needle tube inserted into the inner cavity of the catheter seat is shallow, and the length of the inner cavity is less than one fourth of the length of the rear inner cavity of the catheter seat. Thus requiring a longer needle cannula length. Two disadvantages result: the requirements on the strength of the needle tube material and the manufacturing process are high; if the needle tube polluted by blood needs to be wrapped after the indwelling needle is used, the protective sleeve used for wrapping the needle tube is longer, and the protective sleeve needs to be preassembled at the rear part of the needle seat so as to be convenient for withdrawing the needle tube, the needle tube can be automatically and timely wrapped, and the long sleeve is configured to block the indwelling needle when the indwelling needle punctures the blood vessel, so that the use and the operation are inconvenient.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides the safe open type indwelling needle with the protrusive needle rod, which has relatively low requirements on the material strength and the manufacturing process of the needle tube and is convenient to use, and further aims to provide the safe open type indwelling needle with the protrusive needle rod, which has a shorter protective sleeve and is convenient to operate.

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

Preceding needle bar safety type open needle of keeping somewhere, including catheter subassembly and puncture subassembly, wherein puncture subassembly includes puncture needle pipe and needle file, the catheter subassembly includes pipe and pipe seat, inner chamber and back inner chamber before the pipe seat has, the pipe is planted in the inner chamber in the front, the needle file includes anterior segment and back end, anterior segment suit is in pipe seat back inner chamber, the needle file back end exposes outside the pipe seat, the needle pipe rear end is pegged graft in the needle file, needle pipe inner chamber hole and needle file back end return blood chamber UNICOM, the needle pipe passes pipe seat inner chamber and behind the pipe front end according to the preface, the needle point exposes the pipe point, its structural feature lies in: the front section of the needle seat is in a long rod shape, extends forwards from the rear end surface of the catheter seat and is inserted to or close to the joint part of the front inner cavity and the rear inner cavity of the catheter seat, and the insertion depth is more than three quarters of the length of the rear inner cavity of the catheter seat.

Thus, the length of the needle tube exposed outside the needle seat is greatly reduced. Yet another unexpected effect is: the forward extending needle base front section can realize sliding connection with the outer wall structure, which means that a part of the needle tube length replaced by the needle base front section can realize extension and retraction through sliding connection.

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

Still include a needle tubing parcel thimble assembly, its front end and pipe seat rear end buckle connect, the needle file back end contains the cover in this needle tubing parcel thimble assembly inner chamber, the operating handle who exposes outside needle tubing parcel thimble assembly passes the slip line seam of axial extension on this subassembly lateral wall and is connected with the needle file, slip line seam rear end opening, outside needle file back end and needle file anterior segment roll-off needle tubing parcel thimble assembly via this opening, the needle file front end is connected with parcel thimble assembly card solid through the buckle device of an advance and retreat locking.

The needle tube wrapping sleeve assembly is a protective sleeve assembly and is used for wrapping the needle tube which is separated from the catheter seat after puncture is finished so as to avoid the needle tube from being exposed. Protective sheath assemblies are common in the art.

Because the length of a part of the needle tube replaced by the front section of the needle base can be extended and retracted through the sliding sleeve connection and finally can be extended out of the protective sleeve, the required wrapping length of the protective sleeve is shortened, and thus, the whole length of the protective sleeve is shortened or the structure of the telescopic multiple protective sleeve is simplified.

In the present invention, further preferred for the needle cannula covering cannula assembly are:

the needle tube wrapping sleeve assembly comprises a wrapping sleeve and a locking connecting piece, the front end of the wrapping sleeve is connected with the rear end of the catheter seat in a buckling mode, the sliding slot seam extends to the opening at the rear end along the axial direction of the side wall of the sliding slot seam, the locking connecting piece is connected with the sliding sleeve of the wrapping sleeve, the locking connecting piece sliding to the rear end of the wrapping sleeve is connected with the elastic convex buckle at the rear end of the wrapping sleeve in a buckling mode, the front section of the needle seat is connected with the inner cavity of the locking connecting piece in a sliding mode, and the buckling device for forward and backward locking is located between the front section of the needle seat and the locking connecting piece.

Further preferences regarding the elastic snap-fit connection are:

one is that:

the locking connecting piece is connected in the inner cavity of the wrapping sleeve in a sliding way, the elastic convex card is provided with an elastic arm, the elastic arm is positioned on the wrapping sleeve, a convex point for buckling is arranged on the inner side of the elastic arm and is used for being clamped into a through hole or a groove which is correspondingly matched after the needle tube is withdrawn, the forward movement of the locking connecting piece is limited, and the through hole or the groove is positioned at the rear part of the locking connecting piece.

The other is as follows:

the locking connecting piece comprises body, ring and rib, and the ring encircles outside this body and links into an integrated entity through radial rib, and the rib corresponds the matching with the slip line seam, and body sliding sleeve connects in parcel sleeve pipe inner chamber, and the ring sliding sleeve is connected on parcel sleeve pipe periphery wall, slides to the locking connecting piece of parcel sleeve pipe rear end and the elasticity protruding card buckle connection of parcel sleeve pipe rear end and is located between this ring and the parcel sleeve pipe.

After the connecting piece is locked by each rod piece, the ring can also play a role in limiting the opening of the slot on the wrapping sleeve, so that the artificial swing amplitude of the front section of the needle base is greatly reduced, and the needle tube is wrapped more reliably.

Further preferences regarding the elastic snap-on connection provided between this ring and the packing sleeve are:

one is that:

the parcel sleeve pipe can also be a snap ring and a convex card buckle connection with the locking connecting piece elastic convex card buckle connection, the elastic convex card on the parcel sleeve pipe is composed of two convex cards with a certain axial distance, the top surface of the convex card is higher than the outer surface of the sleeve pipe, the two convex cards are arranged on the same straight line or arranged around an axial dislocation, the front and the back of the circular ring are respectively provided with a rectangular cross section, after the needle is left and removed, the front convex card vertical surface on the parcel sleeve pipe is contacted with the front vertical surface of the circular ring of the locking connecting piece, the locking connecting piece moves forwards, the back convex card vertical surface on the parcel sleeve pipe is contacted with the back vertical surface of the circular ring of the locking connecting piece, and the locking connecting piece slides out the parcel sleeve pipe.

The other is as follows:

the tail end of the outer ring of the wrapping sleeve is provided with a shaft shoulder capable of blocking the ring from disengaging, the tail end of the sliding slot on the wrapping sleeve is provided with an elastic buckle, and the distance between the elastic buckle and the shaft shoulder is matched with the thickness of the ring in an accommodating mode.

Because of the accommodation match, the ring can be trapped between the shaft shoulder and the elastic buckle, so that the locking connecting piece can not advance and retreat relative to the wrapping sleeve when the remaining needle is withdrawn.

Further preferences regarding the wrapping sleeve are:

the parcel sleeve pipe anterior segment has or is a symmetry or single arc piece, and the arc piece is pegged graft between two tight lugs in catheter hub rear end for prevent to keep the needle catheter hub rotation when the puncture, should wrap the sleeve pipe anterior segment or construct with parcel sleeve pipe body an organic whole, or with parcel sleeve pipe body components of a whole that can function independently structure, when components of a whole that can function independently structure, the body is connected with parcel sleeve pipe anterior segment elasticity eye-splice.

The inner side corner of the front edge of the circular arc sheet is provided with a convex card which is convenient for hooking the peripheral flange at the rear end of the catheter seat, so that the wrapping sleeve is always connected with the catheter component before the remaining needle is withdrawn.

Further preferably, the forward and backward locking engagement device includes:

one is that:

the locking connector has one stepped cavity with one hole cavity with one inner chord plane matching the outer chord plane of the front needle seat section, the inner chord plane is in the same side as the elastic convex card and the plane is parallel to the top of the convex point on the elastic convex card, and the outer chord plane of the front needle seat section forms one outer stepped shoulder matching the inner stepped shoulder of the locking connector cavity.

The other is as follows:

the locking connector is provided with a stepped inner cavity, one hole cavity is provided with an inner chord plane, the inner chord plane is matched and corresponds to the outer chord plane of the front section of the needle seat, the front end of the outer chord plane of the front section of the needle seat is blindly stopped to form an outer step shoulder, the outer step shoulder is matched with the corresponding inner step shoulder of the inner cavity of the locking connector, after the needle tube is withdrawn, the inner step shoulder and the outer step shoulder touch and stop the backward movement of the front section of the needle seat, a convex clamping point is arranged on the outer chord plane and is positioned at a distance behind the outer step shoulder, a sliding groove extends on the inner chord plane, the rear end of the sliding groove is opened, an elastic buckle is arranged at the opening, the convex clamping point is slid in the sliding groove in a sliding manner, after the needle withdrawal is finished, the convex clamping point slides backwards out of the elastic buckle and is stopped by the elastic buckle.

Further preferences regarding the needle mount are:

the needle file comprises needle bar and needle file body, and the needle bar is that a cylinder is described, and the needle bar rear end is fixedly connected with the front end rigid coupling vestibule of the blood return storehouse body of the needle file body, and the anterior segment of the needle bar inner chamber is a fixed needle point and glues the cave, and the back end is a blood through channel, and the blood return storehouse on the needle file is communicated, and the point is glued the cave and is crossed a needle insertion hole between the blood through channel for peg graft the needle tubing, the needle file anterior segment of saying is located the needle bar.

The needle seat body is made of transparent or semitransparent materials and consists of an operating handle and a blood return cabin body, the rear section of the needle seat is positioned on the needle seat body, and the operating handle is connected with the blood return cabin body into a whole through a connecting rib; the periphery of the blood returning bin body is a step revolving body, the small head end part is inserted into the large head inner cavity of the locking connecting piece, the cross section of the fixing hole of the small head end inner cavity is similar to the cross section of the periphery of the needle rod and is used for fixing the needle rod, the periphery of the large head end is provided with an inner chord plane, the plane position is the same side as the elastic convex card on the wrapping sleeve and is used for avoiding the top surface of the convex point, and the large head end inner cavity is a blood returning cavity and is communicated with the inner cavity of the needle rod through a liquid passing hole.

In summary, compared with the prior art, the invention has the following advantages: the needle tube has the advantages of relatively low material strength and manufacturing process requirements, convenient use, short protective sleeve, convenient operation, simple structure and convenient manufacture.

Drawings

FIG. 1 is a schematic view of an open type indwelling needle according to the prior art;

FIG. 2 is a schematic front view of the structure of a safety open type indwelling needle with a forward extending needle rod according to the present invention;

FIG. 3 is a schematic sectional view showing the structure of a safety open type indwelling needle with a forwardly extending needle rod according to the present invention;

FIG. 4 is a schematic perspective view of a wrap sleeve construction; FIG. 5 is a schematic perspective view of another axially oriented overwrapped sleeve construction; FIG. 6 is a perspective cross-sectional view of the wrap sleeve;

FIG. 7 is a schematic perspective view of a locking connection; FIG. 8 is a left side view of the locking connection; FIG. 9 is a perspective cross-sectional view of the locking connection;

FIG. 10 is a schematic perspective view of the needle bar construction; FIG. 11 is a perspective cross-sectional view of the needle shaft;

FIG. 12 is a schematic perspective view of the structure of the hub body; FIG. 13 is a schematic perspective view of another axial needle holder body structure; FIG. 14 is a right side view of the hub body; FIG. 15 is a front cross-sectional view of the hub body; fig. 16 is a left side view of the hub body;

FIG. 17 is a schematic view showing an assembled state of a safety type open type indwelling needle of the present invention;

FIG. 18 is a schematic view of a needle withdrawing configuration of a safety open type indwelling needle with a forwardly extending needle shaft according to the present invention;

FIG. 19 is a schematic view of the needle bar in a stopped condition relative to the locking link when withdrawing the needle;

FIG. 20 is a schematic view of the locking connection in a stopped state relative to the covering sleeve upon withdrawal of the needle; FIG. 21 is a partial enlarged view of FIG. 20;

FIG. 22 is a schematic perspective view of a wrap sleeve construction; FIG. 23 is a perspective cross-sectional view of the wrap sleeve;

FIG. 24 is a schematic perspective view of a locking connection; FIG. 25 is a schematic perspective view of another axially oriented locking connection; FIG. 26 is a left side view of the locking connection;

FIG. 27 is a schematic view of a needle withdrawing state in a front view; FIG. 28 is a schematic view of a needle withdrawing state in a top view;

FIG. 29 is a schematic perspective view of a wrap sleeve construction; FIG. 30 is a schematic perspective view of the forward section of the wrap sleeve; FIG. 31 is a schematic perspective sectional view of a forward section of the wrap sleeve; FIG. 32 is a left front view of the wrap sleeve; FIG. 33 is a schematic perspective view of the wrap sleeve body construction; FIG. 34 is a schematic perspective cross-sectional view of a wrap sleeve construction;

FIG. 35 is a schematic view of a needle withdrawing state;

FIG. 36 is a schematic sectional view showing the structure of a safety open type indwelling needle of the present invention;

FIG. 37 is a schematic perspective view of the needle bar construction; FIG. 38 is a schematic perspective cross-sectional view of the needle shaft construction;

FIG. 39 is a schematic perspective view of a locking connection; FIG. 40 is a right side view of the locking connection; FIG. 41 is a front view of the locking connection;

FIG. 42 is a schematic perspective view of the structure of the hub body; FIG. 43 is a front cross-sectional view of the hub body;

FIG. 44 is a schematic view of the needle withdrawing state in the front view; fig. 45 is a schematic view of a needle withdrawing state in a top view.

The invention is described in more detail below with reference to the accompanying drawings.

Detailed Description

The first embodiment is as follows:

referring to fig. 2, the safety open indwelling needle of the front needle-extension rod type is composed of a catheter assembly 1, a front needle-extension rod type puncture assembly 3 and a needle tube wrapping sleeve assembly 4.

Referring to fig. 3, the forward extending needle bar type puncture assembly 3 consists of a needle base body 3.1, a needle bar 3.2 and a needle tube 3.3; the needle tube wrapping sleeve assembly 4 consists of a wrapping sleeve 4.1 and a locking connector 4.2.

Referring to fig. 4, 5 and 6, the wrapping sleeve 4.1 is composed of a short front tube 4.1.1, an arc-shaped sheet 4.1.2, a long rear tube 4.1.3, an elastic convex card 4.1.4, a sliding slot 4.1.5 and an inner cavity 4.1.6. The front end of the catheter is provided with a symmetrical or single arc-shaped piece 4.1.2, the arc-shaped piece 4.1.2 is inserted between two fastening lugs at the rear end of the catheter holder and is used for preventing the catheter holder from rotating during puncture, and the inner side corner of the front edge of the arc-shaped piece is provided with a convex card 4.1.2.1 which is convenient for hooking a peripheral flange at the rear end of the catheter holder, so that the wrapping sleeve is kept connected with the catheter component all the time before the withdrawal of the indwelling needle is finished. The elastic convex clip salient point 4.1.4.1 is arranged on the inner side of the elastic arm and is used for locking the locking connecting piece after the needle tube is withdrawn. The sliding slots 4.1.5 are distributed unilaterally and extend in the axial direction, with an open rear end.

Referring to figures 7, 8 and 9, the locking connection is a stepped tube with a front small tube 4.2.1 and a rear tube 4.2.2. The elastic convex card 4.2.3 salient points 4.2.3.1 are arranged on the inner side of the elastic arm and are used for propping against the front end surface of the front needle extension rod to limit the front movement of the front needle extension rod after the needle tube is withdrawn; the rectangular through hole 4.2.4 is communicated with the inner cavity of the locking connecting piece, and is used for being clamped into a salient point 4.1.4.1 wrapping the elastic convex card 4.1.4 on the sleeve 4.1 after the needle tube is withdrawn, so that the locking connecting piece is limited from moving forwards; the locking connector cavity 4.2.5 is a stepped cavity with an inner chordal plane 4.2.5.1 in the cavity at the shoulder wall of the step on the same side as the resilient tab 4.2.3 and flush with the top surface of the projection 4.2.3.1 on the resilient tab 4.2.3.

Referring to fig. 10-16, the needle mount consists of a needle shaft 3.2 and a needle mount body.

Referring to fig. 10 and 11, the needle bar 3.2 is a cylindrical rod, and a long-section inner chord plane 3.2.2 is arranged on the cylindrical surface of the needle bar, a step shoulder 3.2.1.1 is naturally formed with the cylindrical surface, and the inner chord plane is matched with the structure plane 4.2.5.1 on the locking connecting piece to slide and stop rotating; the step shoulder 3.2.1.1 is used for stopping the needle tube when the needle tube is withdrawn and touching the step shoulder 4.2.2.1 on the locking connecting piece, and the rear end of the needle rod is fixedly connected with the front end fixedly connected with the hole cavity 3.1.5 of the blood returning bin body 3.1.3 of the needle base; the front section of the inner cavity of the needle rod is a needle fixing and dispensing point, the rear section is a blood passing channel which is communicated with a 3.1 blood return bin on the needle base body, and a needle inserting hole is arranged between the needle fixing point and the blood passing channel and is used for inserting the needle tube 3.3.

Referring to fig. 12, 13, 14, 15 and 16, the needle seat 3.1 is made of transparent or semitransparent material, which is convenient for observing puncture blood return and consists of an operating handle 3.1.1 and a blood return bin body 3.1.3 which are connected into a whole by a vertical push handle 3.1.1 and a side push handle 3.1.2, and the operating handle is connected with the blood return bin body into a whole by a connecting rib 3.1.4; the periphery of the blood returning bin body is a stepped rotary body, the small head end part is inserted into the large head inner cavity of the locking connecting piece, the cross section shape of the small head end inner cavity fixing hole 3.1.5 is similar to that of the outer periphery of the needle rod 3.2 and is used for fixing the needle rod, the periphery of the large head end is provided with an inner chord plane 3.1.3.1, the plane position is the same side with the elastic convex card on the wrapping sleeve and is used for avoiding the top surface of the convex point, and the large head end inner cavity is a blood returning cavity and is communicated with the inner cavity of the needle rod 3.2 through the liquid passing hole 3.1.7.

Assembling the remaining needle:

as shown in figure 17, the puncture component is assembled, firstly the needle tube is fixedly connected with the needle bar, the puncture inclined plane of the needle tube is approximately the same side with the inner chord plane on the needle bar, then the small end of the locking connecting piece is sleeved into the needle bar towards the needle tube direction, then the needle bar is inserted into the fixedly connecting hole on the needle base, and the glue is dispensed and fixedly connected. Then the open end of the sliding slot of the wrapping sleeve faces the needle base, the needle tube, the needle rod and the locking connecting piece are sleeved, the sliding slot is arranged along the connecting rib on the needle base and slides towards the rear part of the needle base until the rear end face of the arc piece on the wrapping sleeve touches the front end face of the vertical push handle on the needle base, the needed catheter assembly is sleeved, the rear end of the catheter assembly is inserted into a frustum at the front end of the wrapping sleeve and an annular gap between the arc piece and the frustum, the convex clamp on the arc piece hooks the flange at the rear end of the catheter base, and finally, the open end of a blood return cavity on the needle base is plugged into an exhaust plug, so that the assembly of the indwelling needle is completed, as shown in fig. 3.

The use of an indwelling needle:

after the indwelling needle is successfully punctured and cannulated, the needle base is pulled to drive the puncture assembly to be far away from the catheter assembly, the puncture assembly gradually moves backwards along the inner cavity of the wrapping sleeve, the needle base slides out of the wrapping sleeve, then the needle rod also gradually exposes out of the sleeve, when the step shoulder at the front end of the needle rod touches the elastic convex card on the locking connecting piece, the connecting piece is driven to slide in the sleeve, the connecting piece touches the elastic convex card on the sleeve along with the backward movement of the needle rod to the big end face, at the moment, the needle base is continuously pulled, the cylindrical convex part at the front end of the needle rod climbs the elastic convex card, the cylindrical convex part enters the locking clamping groove, the front end face of the needle rod touches and is clamped with the rear end face of the elastic convex card, the step shoulder of the needle. Meanwhile, the large-head cylindrical surface on the connecting piece also climbs over the elastic convex card on the sleeve, the convex points on the elastic convex card slide into the rectangular hole on the large head of the connecting piece, and the front and rear vertical surfaces of the convex points of the elastic convex card contact with the wall of the rectangular hole to stop the sliding of the connecting piece, as shown in fig. 20 and 21. Pulling on the needle hub causes the tabs on the arcuate tab at the forward end of the cannula to disengage from the catheter assembly as shown in fig. 18. At this point, withdrawal of the needle cannula is completed, with the needle cannula also completely encased within the cannula.

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

Example two:

referring to fig. 22-28, the locking connection of the packing sleeve to the locking connection member may be a snap-fit connection with a male snap.

The elastic convex card on the wrapping sleeve can be shown in figures 1 and 2, the stop convex card is composed of two convex cards 4.1.6 and 4.1.7 with certain axial distance, the top surfaces of the convex cards are higher than the outer surface of the sleeve, the two convex cards can be on the same straight line and can also be arranged around the axial direction in a staggered manner, the locking connecting piece is shown in figures 3, 4 and 5, a circular ring 4.2.6 with rectangular cross section is arranged at a certain distance from the outer peripheral surface of the big end, and the circular ring and the outer periphery of the connecting piece are connected into a whole through a rib 4.2.7. After the indwelling needle is withdrawn, the front raised card vertical surface on the wrapping sleeve touches the front vertical surface of the locking connecting piece ring, the locking connecting piece moves forwards, the rear raised card vertical surface on the wrapping sleeve touches the rear vertical surface of the locking connecting piece ring, and the locking connecting piece slides out of the wrapping sleeve, as shown in fig. 6 and 7.

After the locking connecting piece is locked by each rod piece, the circular ring can also play a role in limiting the opening of the slot on the wrapping sleeve, so that the artificial swing amplitude of the needle rod is greatly reduced, and the needle tube is wrapped more reliably.

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

Example three:

referring to fig. 29-35, the wrap sleeve may be a split construction, consisting of a front section 4.1.8 and a body 4.1.9. The front section is provided with a stepped snap hole 4.1.8.1 and a corresponding snap receptacle 4.1.8.2. The front end of the body is provided with a buckling convex card 4.1.9.1 correspondingly matched with the stepped buckling hole 4.1.8.1 and the buckling insertion hole 4.1.8.2, and is buckled with the stepped buckling hole 4.1.8.1 through the buckling insertion hole 4.1.8.2. The rear end of the body outer ring is provided with a shoulder 4.1.9.2 for stopping the ring from separating to form a stop flange clip, and the rear end of the sliding slot on the body is provided with an elastic clip 4.1.9.3 as a stop elastic clip, and the distance between the elastic clip and the shoulder is matched with the thickness of the ring 4.2.6 (see figure 24). So that when the needle is withdrawn, the ring on the locking connector just falls into it, in a state in which it is both limited front and back, as shown in fig. 35.

The embodiment is the same as the embodiment except for the above-mentioned portions.

The best embodiment is as follows:

referring to fig. 36-45, the locking connector has a stepped inner cavity, the middle cavity has an inner chord plane, the inner chord plane matches and corresponds to the outer chord plane of the needle rod, the front end of the outer chord plane of the needle rod forms an outer step shoulder in a blind manner, the outer step shoulder matches with the corresponding inner step shoulder of the inner cavity of the locking connector, the inner and outer step shoulders touch the backward movement of the front section of the locking needle base after the needle is removed from the needle tube, the outer chord plane is provided with a convex clamping point, the convex clamping point is located at a distance behind the outer step shoulder, the inner chord plane extends with a sliding groove, the rear end of the sliding groove is open, but an elastic buckle is arranged at the opening, the convex clamping point is slid in the sliding groove in a sliding way, and after the needle is removed, the convex clamping point slides backwards out of the elastic buckle but is stopped by the elastic buckle.

Claims

1. Preceding needle bar safety type open needle of keeping somewhere, including catheter subassembly and puncture subassembly, wherein puncture subassembly includes puncture needle pipe and needle file, the catheter subassembly includes pipe and pipe seat, inner chamber and back inner chamber before the pipe seat has, the pipe is planted in the inner chamber before, the needle file includes anterior segment and back end, anterior segment suit is in pipe seat back inner chamber, the needle file back end exposes outside the pipe seat, the needle pipe rear end is pegged graft in the needle file, needle pipe inner chamber hole and needle file back end return blood chamber UNICOM, the needle pipe passes pipe seat inner chamber and behind the pipe front end according to the preface, the needle point exposes the pipe point, its characterized in that: the front section of the needle seat is in a long rod shape, extends forwards from the rear end surface of the catheter seat and is inserted to or close to the joint part of the front inner cavity and the rear inner cavity of the catheter seat, and the insertion depth is more than three quarters of the length of the rear inner cavity of the catheter seat.

2. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 1, wherein: still include a needle tubing parcel thimble assembly, its front end and pipe seat rear end buckle connect, the needle file back end contains the cover in this needle tubing parcel thimble assembly inner chamber, the operating handle who exposes outside needle tubing parcel thimble assembly passes the slip line of contact seam and the needle file of axial extension on this needle tubing parcel thimble assembly lateral wall and is connected, slip line of contact seam rear end opening, outside needle file back end and needle file anterior segment roll-off needle tubing parcel thimble assembly via this opening, the needle file front end is connected with needle tubing parcel thimble assembly card group through the buckle device of an advance and retreat locking.

3. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 2, wherein: the needle tube wrapping sleeve assembly comprises a wrapping sleeve and a locking connecting piece, the front end of the wrapping sleeve is connected with the rear end of the catheter seat in a buckling mode, the sliding slot seam extends to the opening at the rear end along the axial direction of the side wall of the sliding slot seam, the locking connecting piece is connected with the sliding sleeve of the wrapping sleeve, the locking connecting piece sliding to the rear end of the wrapping sleeve is connected with the elastic convex buckle at the rear end of the wrapping sleeve in a buckling mode, the front section of the needle seat is connected with the inner cavity of the locking connecting piece in a sliding mode, and the buckling device for forward and backward locking is located between the front section of the needle seat and the locking connecting piece.

4. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the locking connecting piece is connected in the inner cavity of the wrapping sleeve in a sliding way, the elastic convex card is provided with an elastic arm, the elastic arm is positioned on the wrapping sleeve, a convex point for buckling is arranged on the inner side of the elastic arm and is used for being clamped into a through hole or a groove which is correspondingly matched after the needle tube is withdrawn, the forward movement of the locking connecting piece is limited, and the through hole or the groove is positioned at the rear part of the locking connecting piece.

5. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the locking connecting piece comprises body, ring and rib, and the ring encircles outside this body and links into an integrated entity through radial rib, and the rib corresponds the matching with the slip line seam, and body sliding sleeve connects in parcel sleeve pipe inner chamber, and the ring sliding sleeve is connected on parcel sleeve pipe periphery wall, slides to the locking connecting piece of parcel sleeve pipe rear end and the elasticity protruding card buckle connection of parcel sleeve pipe rear end and is located between this ring and the parcel sleeve pipe.

6. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the wrapping sleeve is connected with the locking connecting piece through the elastic convex card in a buckling mode, the elastic convex card on the wrapping sleeve is formed by two convex cards with a certain axial distance, the top surfaces of the convex cards are higher than the outer surface of the sleeve, the two convex cards are arranged on the same straight line or in a staggered mode around the axial direction, the front surface and the rear surface of the circular ring are respectively provided with a rectangular cross section, after the needle is retained and removed, the locking connecting piece is stopped to move forwards, and the vertical surface of the front convex card on the wrapping sleeve is contacted with the vertical surface of the circular ring of the locking connecting piece; the locking connecting piece slides out of the wrapping sleeve, and then the rear convex card vertical surface on the wrapping sleeve touches the rear vertical surface of the locking connecting piece circular ring.

7. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the tail end of parcel sleeve pipe outer lane is provided with the shoulder that can block the ring and break away from, and the tail end that lies in the slip line of a slot on this parcel sleeve pipe has the elasticity buckle, and the distance of this elasticity buckle and shoulder matches with the thickness of ring for the ring just in time can hold between elasticity buckle and shoulder.

8. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 2, wherein: the parcel sleeve pipe anterior segment has or is a symmetry or single arc piece, and the arc piece is pegged graft between two tight lugs in catheter hub rear end for prevent to keep the needle catheter hub rotation when the puncture, should wrap the sleeve pipe anterior segment or construct with parcel sleeve pipe body an organic whole, or with parcel sleeve pipe body components of a whole that can function independently structure, when components of a whole that can function independently structure, the body is connected with parcel sleeve pipe anterior segment elasticity eye-splice.

9. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the locking connector has one stepped cavity with one hole cavity with one inner chord plane matching the outer chord plane of the front needle seat section, the inner chord plane is in the same side as the elastic convex card and the plane is parallel to the top of the convex point on the elastic convex card, and the outer chord plane of the front needle seat section forms one outer stepped shoulder matching the inner stepped shoulder of the locking connector cavity.

10. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 3, wherein: the locking connector is provided with a stepped inner cavity, one of the cavities is provided with an inner chord plane, the inner chord plane is matched and corresponds to the outer chord plane of the front section of the needle seat, the front end of the outer chord plane of the front section of the needle seat is blind to form an outer step shoulder, the outer step shoulder is matched with the corresponding inner step shoulder of the inner cavity of the locking connector, after the needle tube is withdrawn, the inner step shoulder and the outer step shoulder touch and stop the backward movement of the front section of the needle seat, the outer chord plane is provided with a convex clamping point which is positioned at a distance behind the outer step shoulder, the inner chord plane is extended with a sliding groove, the rear end of the sliding groove is open, but an elastic buckle is arranged at the opening, the convex clamping point is slid in the sliding groove in a sliding way, and after the needle is withdrawn, the convex clamping point slides backwards out of the elastic buckle but is stopped by the elastic buckle.

11. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 1, wherein: the needle seat is composed of a needle rod and a needle seat body, the needle rod is in a cylindrical rod shape, the rear end of the needle rod is fixedly connected with the front end fixedly connected with a hole cavity of the blood returning cabin body of the needle seat body, the front section of the inner cavity of the needle rod is a needle fixing and dispensing point, the rear section of the inner cavity of the needle rod is a blood passing channel and communicated with the blood returning cabin on the needle seat, a needle inserting hole is formed between the needle fixing and dispensing point and the blood passing channel and used for inserting a needle tube, and the front section of the needle seat is positioned on the needle rod.

12. The safety open indwelling needle with a forwardly extending needle shaft as claimed in claim 1, wherein: the needle seat body is made of transparent or semitransparent materials and consists of an operating handle and a blood return cabin body, the rear section of the needle seat is positioned on the needle seat body, and the operating handle is connected with the blood return cabin body into a whole through a connecting rib; the periphery of the blood returning bin body is a step revolving body, the small head end part is inserted into the large head inner cavity of the locking connecting piece, the cross section of the fixed connection hole of the small head end inner cavity is similar to that of the periphery of the needle rod and is used for fixedly connecting the needle rod, the periphery of the large head end is provided with an inner chord plane, the plane position is the same side as the elastic convex card on the wrapping sleeve and is used for avoiding the top surface of the convex point, and the large head end inner cavity is a blood returning cavity and is communicated with the inner cavity of the needle rod through a liquid passing hole.