CN211634683U

CN211634683U - Pen holder type indwelling needle with shielding needle eccentric blocking piece

Info

Publication number: CN211634683U
Application number: CN202020139212.9U
Authority: CN
Inventors: 张洪杰
Original assignee: Beipu Medical Technology Co ltd
Current assignee: Beipu Medical Technology Co.,Ltd.
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-10-09
Anticipated expiration: 2030-01-21

Abstract

A pen-holder type indwelling needle with an eccentric blocking piece of a shielding needle comprises: the inner wall of the front part of the hand-held sleeve is provided with a front annular stop step, a radially through button sliding groove and a rear annular stop step; the catheter seat joint is arranged at the front end of the handheld sleeve; the brake button is slidably arranged in the button sliding groove of the handheld sleeve; the front end of the needle base and the brake button form a latch mechanism, and the outer wall of the rear part of the needle base is provided with an annular boss; the eccentric baffle is arranged in the catheter seat joint and is provided with an eccentric hole and a plurality of blind holes; the needle tube is fixed on the needle seat; the filtering plug is arranged in the needle base; the two ends of the spring are abutted against the rear annular stop step and the annular boss; the rear end sleeve is arranged at the rear part of the handheld sleeve; a conduit seat assembly or a three-way conduit seat assembly. The self-destruction of the pen-holder type indwelling needle is triggered by pressing the brake button, so that the automatic retraction of the needle tube and the shielding of the needle tip are realized, and the convenience and the safety are improved.

Description

Pen holder type indwelling needle with shielding needle eccentric blocking piece

Technical Field

The utility model belongs to the technical field of keep somewhere the needle, concretely relates to pen-holder type keeps somewhere needle with eccentric separation blade of shielding needle.

Background

The existing pen-holder type indwelling needle drives the needle tube to retract into the sleeve through the needle tube retracting mechanism to realize self-destruction, but the needle point of the retracted needle tube has the possibility of extending out of the sleeve again, so that potential safety hazards exist. Meanwhile, a needle tube retraction mechanism which is easier to self-destruct needs to be designed so as to improve the convenience and reliability of the use of the pen-holder type indwelling needle product.

SUMMERY OF THE UTILITY MODEL

To solve the above problems, the utility model provides a needle is kept somewhere to penholder formula with eccentric separation blade of shielding needle.

The purpose of the utility model can be realized by the following technical scheme:

a pen-holder type indwelling needle with an eccentric blocking piece of a shielding needle comprises:

the inner wall of the front part of the handheld sleeve is provided with a front annular stop step and a rear annular stop step, and a button sliding groove which is communicated along the radial direction is arranged between the front annular stop step and the rear annular stop step;

the catheter seat joint comprises a joint seat body part and a joint part, wherein the joint seat body part is arranged in the front end of the handheld sleeve and is stopped at the front side of the front annular stopping step;

the brake button is slidably arranged in a button sliding groove of the handheld sleeve, a lock hole bayonet and a lock hole flaring which are connected along the sliding direction are formed in the brake button, and a convex block is arranged at the edge of the lock hole bayonet;

the needle seat is slidably arranged in the handheld sleeve, a second needle through hole and an exhaust hole which are communicated back and forth along an axis are formed in the needle seat, the front end of the needle seat is matched with the lock hole flaring of the brake button, the outer wall of the front end of the needle seat is provided with a lock groove matched with the lock hole bayonet of the brake button, the needle seat and the brake button form a latch mechanism, the outer wall of the front end of the needle seat is provided with a rotary clamping groove, the rotary clamping groove is matched with the convex block of the brake button to limit the circumferential rotation of the needle seat, the outer wall of the rear part of the needle seat is provided with an annular boss which is protruded along the circumferential direction;

the eccentric blocking pieces are arranged in the rear cavity of the connector seat body part of the conduit seat connector, arranged along the radial surface, axially limited by the transverse partition plate of the conduit seat connector and the front annular stopping step of the handheld sleeve, more than 1 piece of the eccentric blocking pieces are arranged, eccentric holes are formed in the eccentric blocking pieces, a plurality of blind holes arranged on the peripheral side of the eccentric holes along the circumferential direction are formed in the rear end surface of the eccentric blocking pieces, and more than 2 supporting points are arranged on the outer contour of the eccentric blocking pieces;

the back part of the needle tube is fixed in the second needle through hole of the needle base, and the front part of the needle tube passes through the eccentric hole of the eccentric baffle, the first needle through hole of the catheter base joint and the catheter base assembly, and then the needle tip is exposed;

the filtering plug is arranged in the exhaust hole of the needle base;

the spring is arranged in the handheld sleeve and is axially extruded by the rear annular stop step of the handheld sleeve and the annular boss of the needle seat, so that the elastic force for enabling the needle seat to retreat along the axial direction is provided, and the size of the elastic force ensures that the needle tip of the needle tube retreats out of the eccentric hole of the eccentric baffle plate;

the rear end sleeve is arranged at the rear part of the handheld sleeve, and the rear end surface of the rear end sleeve is provided with an end hole; and

the catheter base assembly comprises a catheter base, a catheter and a metal wedge, wherein the catheter base is detachably arranged on the catheter base joint;

when the brake button is pressed, the pen rod type indwelling needle is triggered to carry out self-destruction, a lock hole bayonet and a convex block of the brake button are respectively separated from a lock groove and a rotary clamping groove of the needle base, the front end of the needle base can withdraw in a lock hole flaring of the brake button to realize unlocking between the brake button and the needle base, further, the elastic force of a compressed spring is released, the elastic force of the spring enables the needle base and the needle tube to retreat along the axial direction of the hand-held sleeve and the rear end sleeve, and enables the needle point of the needle tube to completely withdraw from an eccentric hole of an eccentric separation blade backwards, the eccentric separation blade without the support of the needle tube freely moves along the radial surface in a rear cavity of a connector base body part of the catheter base connector until reaching a balanced state, at the moment, the eccentric separation blade is in contact with the inner wall of the rear cavity of the connector base body part of the catheter base connector through more than 2 support, the blind hole of the eccentric baffle prevents the needle tip of the needle tube from entering the eccentric hole.

Furthermore, a guide groove is formed in the side wall of the front portion of the handheld sleeve, the guide groove axially extends from the front end face of the handheld sleeve to the front annular stop step or the button sliding groove, a guide groove buckle is formed in the guide groove, and the guide groove buckle is located between the front end face of the handheld sleeve and the front annular stop step; the outer wall of the connector seat body part of the conduit seat connector is provided with a guide bulge, and the guide bulge is in guide fit with the guide groove of the handheld sleeve and is in buckle fit with the guide groove of the handheld sleeve.

Further, the rear part of the hand-held sleeve and the front part of the rear end sleeve are connected by snap fit.

Furthermore, a stop lug is arranged on the side wall of the front cavity of the connector seat body part of the catheter seat connector, and the stop lug is matched with the outer wall of the rear end of the catheter seat to limit the circumferential rotation of the catheter seat.

Furthermore, the joint part of the conduit seat joint is in a shape of a conical spline shaft with a forward small end, and a taper hole matched with the joint part of the conduit seat joint is arranged in the conduit seat of the conduit seat component.

Further, brake button includes button portion and sliding piece portion, button portion sets up outside handheld sheathed tube button spout to be connected with the one end of sliding piece portion, install in the button spout sliding piece portion, lockhole bayonet socket and lockhole flaring are seted up on the sliding piece portion, and the lockhole bayonet socket is close to the other end of sliding piece portion, the lug sets up in the edge of lockhole bayonet socket forward protrudingly.

Furthermore, the brake button is provided with a beam protruding from the surface, the beam extends along the direction perpendicular to the sliding direction of the brake button, and the beam and the button sliding groove of the handheld sleeve are assembled in a transition fit mode.

Further, the rotary clamping groove of the needle seat axially extends to the locking groove from the front end face of the needle seat.

Furthermore, a conical slope surface is arranged between the inner wall of the rear part of the rear end sleeve and the end hole.

The pen holder type indwelling needle is characterized in that a three-way conduit holder component is adopted to replace a conduit holder component, and the three-way conduit holder component comprises a three-way conduit holder, a conduit, a metal wedge and an isolating plug.

Compared with the prior art, the beneficial effects of the utility model are that: the front end of the needle base and the brake button form a latch mechanism, the front end of the needle base is unlocked from the brake button and can retreat by pressing the brake button, the needle base retreats along the axial direction under the action of the elastic force of the spring, and finally, the needle tip of the needle tube retreats out of the eccentric hole of the eccentric separation blade completely and is shielded by the eccentric separation blade. Overall structure is compact, easy operation triggers the automatic withdrawal of needle tubing through manual release latch mechanism, has improved the convenience that the product used, and through the shielding of eccentric separation blade to the needle through-hole of pipe seat joint and the needle point of needle tubing, the security that has improved the product.

Drawings

Fig. 1 is a schematic view of the entire structure of embodiment 1.

FIG. 2 is a sectional view of example 1.

Fig. 3 is a schematic structural view of the hand-held cannula in embodiment 1.

Fig. 4 is another schematic structural view of the hand-held cannula in embodiment 1.

Fig. 5 is a sectional view of the hand-held grommet in example 1.

Fig. 6 is a schematic view of the structure of the catheter hub joint of example 1.

Fig. 7 is another schematic view of the catheter hub joint of embodiment 1.

Fig. 8 is a schematic structural view of a brake button in embodiment 1.

Fig. 9 is a schematic structural view of a needle holder in example 1.

Fig. 10 is another structural schematic view of the needle holder in embodiment 1.

Fig. 11 is a sectional view of the needle holder in embodiment 1.

Fig. 12 is a schematic structural view of the eccentric cam in embodiment 1.

Fig. 13 is a schematic view of a posture of the single eccentric flap in the balanced state in embodiment 1.

Fig. 14 is another posture view of the single eccentric flap of embodiment 1 in a balanced state.

Figure 15 is an assembled view of the embodiment 1 with the rear end sleeve and catheter hub assembly removed.

Fig. 16 is a schematic structural view of the rear end bushing in embodiment 1.

Fig. 17 is a schematic structural view of the catheter holder assembly according to embodiment 1.

FIG. 18 is a schematic view showing the self-destruction state from the unused state in embodiment 1.

Fig. 19 is a schematic view showing the forward end of the hub and the detent button in the locked state and the unlocked state in embodiment 1.

Fig. 20 is a schematic view of an attitude of the 3 eccentric flaps of embodiment 1 in a balanced state.

Fig. 21 is another schematic view of the 3 eccentric baffles of embodiment 1 in a balanced state.

Fig. 22 is a schematic view of the entire structure of embodiment 2.

Fig. 23 is a schematic structural view of the three-way pipe socket assembly according to embodiment 2.

The parts in the figures are numbered as follows:

1 hand-held casing

101 front ring stop step

102 rear ring stop step

103 push button chute

104 guide groove

105 guide groove fastener

106 stop ring

2 conduit seat joint

201 connector base body

202 joint part

203 guide projection

204 diaphragm plate

205 stop lug

206 first needle through hole

3 brake button

301 button part

302 sliding sheet part

303 lock hole bayonet

304 keyhole flare

305 bump

306 stringer

4 needle seat

401 second needle through hole

402 vent hole

403 locking groove

404 rotating card slot

405 annular boss

406 fixed end face

5 eccentric block piece

501 eccentric hole

502 blind hole

503 fulcrum a

504 fulcrum b

505 fulcrum c

6 needle tube

7 Filter plug

8 spring

9 rear end sleeve

901 stop groove

902 end hole

903 conical slope surface

10 conduit seat assembly

1001 catheter hub

1002 catheter

1003 metal wedge

11 three-way pipe seat assembly

1101 three-way pipe seat

1102 catheter

1103 metal wedge

1104 isolating the plug.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

Example 1

Referring to fig. 1 and 2, a penholder type indwelling needle with a shielding needle eccentric baffle comprises a handheld sleeve 1, a catheter hub connector 2, a brake button 3, a needle hub 4, an eccentric baffle 5, a needle tube 6, a filter plug 7, a spring 8, a rear end sleeve 9 and a catheter hub assembly 10.

Referring to fig. 3 to 5, two ends of the handheld sleeve 1 are through, a front annular stop step 101 and a rear annular stop step 102 are provided on an inner wall of a front portion of the handheld sleeve 1, a button sliding groove 103 is provided between the front annular stop step 101 and the rear annular stop step 102, the button sliding groove 103 is radially through-connected to the

handheld sleeve

1, 2 guide grooves 104 are uniformly distributed along a circumferential direction on a side wall of the front portion of the handheld sleeve 1, each guide groove 104 extends from a front end surface of the handheld sleeve 1 to the front annular stop step 101 or the button sliding groove 103 along an axial direction, a guide groove buckle 105 is provided on the guide groove 104, the guide groove buckle is located between the front end surface of the handheld sleeve 1 and the front annular stop step 101, and a stop ring 106 is provided on an outer wall of a rear portion of the handheld sleeve 1. The guide groove 104 may partially or completely penetrate through the sidewall of the handheld cannula 1 or open to the inner wall of the handheld cannula 1.

Referring to fig. 2, 6 and 7, the catheter hub adapter 2 is mounted to the front end of the hand-held cannula 1, and the catheter hub adapter 2 includes an adapter body 201 and an adapter body 202. The utility model discloses a connector, including connector seat body 201, preceding terminal surface, 2 guide protrusions 203, every that the outer wall of connector seat body 201 is equipped with along 2 direction archs 203 of circumference equipartition, every guide protrusion 203 and handheld sleeve 1's guide slot 104 direction cooperation to with handheld sleeve 1's guide slot buckle 105 buckle cooperation, be equipped with horizontal partition plate 204 in the connector seat body 201, horizontal partition plate 204 separates connector seat body 201 internal partitioning into front chamber and back chamber, be equipped with on the preceding cavity lateral wall of connector seat body 201 and end a lug 205. The joint part 202 is a conical spline shaft with a forward small end, the rear part of the joint part 202 is arranged in the front cavity of the joint seat body 201, the rear end of the joint part is connected with the center of the transverse partition plate 204, the joint part 202 is provided with a first needle through hole 206 which is communicated along the axis, and the first needle through hole 206 is communicated with the center of the transverse partition plate 204. During assembly, the outer wall of the connector seat body 201 and the inner wall of the front end of the handheld sleeve 1 are assembled in an interference fit mode, the guide protrusion 203 and the guide groove 104 of the handheld sleeve 1 are assembled in a clearance fit mode, and the guide protrusion 203 and the guide groove buckle 105 of the handheld sleeve 1 are assembled in an interference fit mode.

Referring to fig. 2 and 8, the brake button 3 includes a button portion 301 and a sliding sheet portion 302, the button portion 301 is disposed outside the button sliding slot 103 of the handheld sleeve 1 and connected to one end of the sliding sheet portion 302 in an L shape, the sliding sheet portion 302 is slidably mounted in the button sliding slot 103, the sliding sheet portion 302 is provided with a locking hole bayonet 303 and a locking hole flared opening 304 connected in the sliding direction, the locking hole bayonet 303 is close to the other end of the sliding sheet portion 302 and has a smaller diameter than the locking hole flared opening 304, the other end of the sliding sheet portion 302 is provided with a protrusion 305 protruding forward and a stringer 306, the protrusion 305 is disposed at an edge of the locking hole bayonet 303, the stringer 306 extends in a direction perpendicular to the sliding direction of the sliding sheet portion 302, and the stringer 306 can improve the stability of the brake button 3. During assembly, the sliding piece portion 302 and the button sliding groove 103 of the handheld sleeve 1 are assembled in a clearance fit mode, and the stringer 306 and the button sliding groove 103 of the handheld sleeve 1 are assembled in a transition fit mode.

Referring to fig. 2, 9 to 11, the needle holder 4 is slidably mounted in the hand-held cannula 1, and the front part of the needle holder 4 is conical with a small end facing forward, and the rear part is cylindrical.

A second needle through hole 401 and an exhaust hole 402 which are communicated back and forth along the axis are formed in the needle seat 4, and the diameter of the exhaust hole 402 is larger than that of the second needle through hole 401. The front end of the needle base 4 sequentially penetrates through a hole formed by the front annular stop step 101 of the handheld sleeve 1 forward, a lock hole flaring 304 of the brake button 3 and a hole formed by the rear annular stop step 102 of the handheld sleeve 1 forward, the front end of the needle base 4 is matched with the lock hole flaring 304 of the brake button 3, the outer diameter of the front end of the needle base 4 is larger than the diameter of the lock hole bayonet 303 and smaller than the diameter of the lock hole flaring 304, a lock groove 403 which is concave along the circumferential direction is formed in the outer wall of the front end of the needle base 4, the lock groove 403 is matched with the lock hole bayonet 303 of the brake button 3, and the diameter of the bottom of the lock groove 403 is smaller than the diameter of the lock hole bayonet 303, so that the front end. The outer wall of the front end of the needle seat 4 is provided with a rotary clamping groove 404 extending along the axial direction, the rotary clamping groove 404 extends from the front end face of the needle seat 4 to the locking groove 403, and the rotary clamping groove 404 is matched with the projection 305 of the brake button 3, so that the needle seat 4 is limited by the brake button 3 to rotate circumferentially. During assembly, the front end of the needle seat 4 and the hole formed by the front annular stop step 101 of the handheld sleeve 1, the lock hole flaring 304 of the brake button 3 and the hole formed by the rear annular stop step 102 of the handheld sleeve 1 are assembled in a clearance fit mode respectively, the lock groove 403 and the lock hole bayonet 303 of the brake button 3 are assembled in a clearance fit mode, and the rotary clamping groove 404 and the lug 305 of the brake button 3 are assembled in a clearance fit mode.

The outer wall of the rear part of the needle seat 4 is provided with an annular boss 405 protruding along the circumferential direction, the outer diameter of the annular boss 405 is larger than the inner diameters of the front annular stop step 101 and the rear annular stop step 102 of the handheld sleeve 1, so that the needle seat 4 cannot penetrate out forwards in the handheld sleeve 1. The side of the annular boss 405 is provided with a fixing end face 406 parallel to the axis, and the fixing end face 406 serves as an assembling process face of the needle holder 4. During assembly, the annular boss 405 and the inner wall of the handheld sleeve 1 are assembled in a clearance fit mode.

Referring to fig. 2 and 12, the eccentric blocking piece 5 is installed in the rear cavity of the connector base body 201 of the catheter base connector 2, the eccentric blocking piece 5 is arranged along the radial surface and is axially limited in the front and rear direction by a diaphragm plate 204 of the catheter base connector 2 and a front annular stop step 101 of the handheld sleeve 1, the number of the eccentric blocking pieces 5 is more than 1, the eccentric blocking piece 5 is provided with a through eccentric hole 501, the edge of the eccentric hole 501 is provided with a fillet, the rear end surface of the eccentric blocking piece 5 is provided with a plurality of blind holes 502 which are uniformly distributed on the peripheral side of the eccentric hole 501 along the circumferential direction, and the outer contour of the eccentric blocking piece 5 is provided with more than 2 pivots. When the pen-holder type indwelling needle is not in use, the needle tube 6 passes through the eccentric hole 501 of the eccentric baffle 5; when the penholder type indwelling needle is in a self-destruction state, the needle point of the needle tube 6 can retreat from the eccentric hole 501 of the eccentric baffle 5, the eccentric baffle 5 which is not supported by the needle tube 6 can freely move along the radial surface in the rear cavity of the connector seat body 201 of the catheter seat joint 2 until reaching a balance state, the eccentric baffle 5 in the balance state is in contact with the inner wall of the rear cavity of the connector seat body 201 of the catheter seat joint 2 through a fulcrum on the outer contour to keep balance, the first needle through hole 206 of the catheter seat joint 2 is blocked, and the blind hole 502 on the peripheral side of the eccentric hole 501 prevents the needle point of the needle tube 6 from being led into the eccentric hole 501 through a fillet, so that the needle tube 6 is effectively prevented from penetrating.

The outline shape, the number of the supporting points and the distribution positions of the supporting points of the eccentric baffle 5 are variable. In this embodiment, the outer contour of the eccentric flap 5 is provided with 6 fulcrums, namely 2 fulcrums a503, 2 fulcrums b504, and 2 fulcrums c505, and the eccentric flap 5 has 2 postures in a balanced state in the rear cavity of the connector base body 201 of the catheter base connector 2, as shown in fig. 13 and 14.

Referring to fig. 2 and 15, the rear portion of the needle tube 6 is fixed in the second needle through hole 401 of the needle holder 4, the front portion of the needle tube 6 sequentially passes through the eccentric hole 501 of the eccentric baffle 5 and the first needle through hole 206 of the catheter holder joint 2 and then is exposed out of the front end of the joint portion 202 of the catheter holder joint 2, the front end of the needle tube 6 is a needle point, and the front portion of the needle tube 6 is provided with a blood return groove. During assembly, the rear part of the needle tube 6 and the needle seat 4 can be in press fit, shrink fit or fixed in an environment-friendly adhesive bonding mode, the rear end of the needle tube 6 is flush with the step surface between the second needle through hole 401 and the exhaust hole 402 of the needle seat 4, the needle shaft of the needle tube 6 and the eccentric hole 501 of the eccentric baffle 5 and the second needle through hole 401 of the needle seat 4 are assembled in a clearance fit mode respectively, and minimum friction is required.

Referring to fig. 2 and 15, the filter plug 7 is mounted in the vent hole 402 of the needle holder 4, and the rear end surface of the filter plug 7 is flush with the rear end surface of the needle holder 4. The filter plug 7 is a dense porous material which is air-filtering and liquid-filtering, and in clinical use, the filter plug 7 can not only exhaust air, but also more importantly drain blood from the cavity of the needle tube 6 to the blood return groove, so that the blood return can be visible, and can block the blood from overflowing. During assembly, the outer side surface of the filter plug 7 and the hole wall of the exhaust hole 402 of the needle seat 4 are assembled in an interference fit manner.

Referring to fig. 2 and fig. 15, the spring 8 is installed in the handheld sleeve 1, the front end of the spring 8 abuts against the rear end face of the rear annular stop step 102 of the handheld sleeve 1, the rear end of the spring 8 is sleeved on the needle holder 4, and the rear end abuts against the front end face of the annular boss 405 of the needle holder 4, the spring 8 is in a compressed state to provide an elastic force for retracting the needle holder 4 in the axial direction of the handheld sleeve 1, and the elastic force ensures that the needle tip of the needle tube 6 is retracted from the eccentric hole 501 of the eccentric baffle 5. During assembly, the inner hole at the rear end of the spring 8 and the outer wall of the needle seat 4 are assembled in an interference fit mode, the spring 8 and the inner wall of the handheld sleeve 1 are assembled in a clearance fit mode, and minimum friction is required.

Referring to fig. 2 and 16, the front portion of the rear sleeve 9 is sleeved at the rear portion of the handheld sleeve 1, a circumferential inward-concave stop groove 901 is formed in the inner wall of the front portion of the rear sleeve 9, the stop groove 901 is in snap fit with the stop ring 106 of the handheld sleeve 1, so that the rear sleeve 9 and the handheld sleeve 1 are fixedly connected, an end hole 902 communicated with the inside is formed in the center of the rear end face of the rear sleeve 9, and a conical slope 903 is used for transition between the inner wall of the rear portion of the rear sleeve 9 and the end hole 902. During assembly, the stop groove 901 and the stop ring 106 of the handheld sleeve 1 are assembled in an interference fit manner.

Referring to fig. 2 and 17, the catheter hub assembly 10 includes a catheter hub 1001, a catheter 1002, and a metal wedge 1003. The catheter holder 1001 is detachably mounted on the catheter holder connector 2, a catheter hole and a taper hole which are communicated back and forth along an axis are formed in the catheter holder 1001, the taper hole is matched with the connector portion 202 of the catheter holder connector 2, the rear end of the catheter holder 1001 is embedded in a front cavity of the connector holder body portion 201 of the catheter holder connector 2 and limited by the stop lug 205 to rotate circumferentially, the rear end face of the catheter holder 1001 abuts against a transverse partition 204 of the catheter holder connector 2, and a push plate 10011 is arranged on the outer wall of the catheter holder 1001. The rear part of the conduit 1002 is mounted on the metal wedge 1003 and is arranged in the conduit hole of the conduit seat 1001, the front part of the conduit 1002 is exposed out of the front end of the conduit seat 1001, and the metal wedge 1003 is mounted at the joint of the conduit hole and the taper hole in the conduit seat 1001. During assembly, the catheter holder 1001 and the joint portion 202 of the catheter holder joint 2 are assembled in a clearance fit mode, the catheter holder 1001, the catheter 1002 and the metal wedge 1003 are assembled in an interference fit mode, and the catheter 1002 and the metal wedge 1003 are assembled in an interference fit mode.

Referring to the uppermost part of fig. 18 and the left part of fig. 19, the pen type indwelling needle is in an unused state, and the brake button 3 is in a pressable state at this time. The lock hole bayonet 303 of the brake button 3 is clamped with the lock groove 403 of the needle seat 4 to limit the axial movement of the needle seat 4, and the convex block 305 of the brake button 3 is clamped with the rotary clamping groove 404 of the needle seat 4 to limit the circumferential rotation of the needle seat 4. The needle point of the needle tube 6 passes through the eccentric hole 501 of the eccentric baffle 5, the first needle through hole 206 of the catheter holder joint 2, the metal wedge 1003 of the catheter holder assembly 10 and the catheter 1002 in sequence and then is exposed out of the front end of the catheter holder assembly 10, the exposed length of the needle point of the needle tube 6 meets the standard requirement, clinical puncture can be carried out, and the blood returning groove of the needle tube 6 shows red blood, which indicates that the puncture is effective. The spring 8 is pressed by the rear annular stop step 102 of the hand-held sleeve 1 and the annular boss 405 of the needle seat 4, is in a compressed state and maintains enough elastic force, the released elastic force is used for enabling the needle seat 4 and the needle tube 6 to retreat along the axial direction of the hand-held sleeve 1 and the rear end sleeve, and the size of the elastic force ensures that the needle point of the needle tube 6 can retreat out of the eccentric hole 501 of the eccentric baffle 5.

Referring to the middle portion of fig. 18, the catheter hub assembly 10 is detached and self-destructed after use of the pen-type indwelling needle.

After effective puncture is completed in clinical use and before the self-destruction is triggered by pressing the brake button 3, since the catheter hub 1001 of the catheter hub assembly 10 is embedded in the front cavity of the hub body 201 of the catheter hub connector 2 and is limited in circumferential rotation by the stop lug 205, the push plate 10011 of the catheter hub 1001 can be manually and stably pushed forward in the axial direction to introduce the catheter into the blood vessel, thereby realizing the separation of the catheter hub assembly 10.

The button part 301 of the brake button 3 is manually pressed to trigger the pen-type indwelling needle to self-destruct. Referring to the right part of fig. 19, the locking hole bayonet 303 of the brake button 3 is disengaged from the locking groove 403 of the needle hub 4, the projection 305 of the brake button 3 is disengaged from the rotation bayonet 404 of the needle hub 4, so that the axial movement and circumferential rotation limitation of the needle hub 4 are released, the front end of the needle hub 4 can be withdrawn from the locking hole flared opening 304 of the brake button 3, and the unlocking between the brake button 3 and the needle hub 4 is realized. The elastic force of the compressed spring 8 is released, so that the needle seat 4 and the needle tube 6 are retracted along the axial direction of the hand-held sleeve 1 and the rear end sleeve, and the needle tip of the needle tube 6 is completely withdrawn from the eccentric hole 501 of the eccentric baffle 5. The eccentric separation blade 5 without the support of the needle tube 6 freely moves along the radial surface in the rear cavity of the connector seat body 201 of the catheter seat joint 2 until reaching a balanced state, at the moment, the eccentric separation blade 5 is in contact with the inner wall of the rear cavity of the connector seat body 201 of the catheter seat joint 2 through a support point on the outer contour to keep balance, the solid surface of the eccentric separation blade 5 completely blocks the first needle through hole 206 of the catheter seat joint 2, the blind hole 502 of the eccentric separation blade 5 prevents the needle tip of the needle tube 6 from being led into the eccentric hole 501 through a fillet, the needle tube 6 is effectively prevented from passing through the eccentric hole 501 of the eccentric separation blade 5 to move forwards, finally, the needle seat 4 and the needle tube 6 are shielded in the hand-held sleeve 1 and the rear end sleeve 9 by the eccentric separation blade 5, and the.

The number of the eccentric blocking pieces 5 in this embodiment is 3, and the number of the eccentric blocking pieces 5 may be more or less, as long as the function of blocking the first needle through hole 206 of the catheter hub connector 2 and shielding the needle tip of the needle tube 6 can be realized. The 3-piece eccentric shutter 5 has 2 postures in a balanced state in the rear cavity of the hub body portion 201 of the catheter hub joint 2, see fig. 20 and 21. In a posture of the 3 eccentric flaps 5 shown in fig. 20 in a balanced state, the center distance between the eccentric hole 501 of the eccentric flap 5 and the first needle through hole 206 of the catheter hub adapter 2 is L1, and the movement locus of the eccentric hole 501 is a circle with a radius of R1 (R1 = L1); in another posture of the 3 eccentric flaps 5 shown in fig. 21 in a balanced state, the center distance between the eccentric hole 501 of the eccentric flap 5 and the first needle through hole 206 of the catheter hub adapter 2 is L2, and the movement locus of the eccentric hole 501 is a circle with a radius of R2 (R2 = L2). Wherein, the diameter of the eccentric hole 501 of the eccentric baffle 5 is D, the diameter of the first needle through hole 206 of the catheter hub connector 2 is D, L1 > (D + D)/2, L2 > (D + D)/2, and L1 (R1) and L2(R2) can be the same or different. Thus, the eccentric hole 501 of the eccentric baffle 5 is always kept in a non-intersecting and non-overlapping state with the first needle hole 206 of the catheter hub connector 2 in a balanced state, and the edge of the eccentric hole 501 can shield the needle hole of the needle tube 6.

Referring to the lowermost part of fig. 18, the pen shaft type indwelling needle completes self-destruction. The spring 8 and the needle seat 4 are connected or separated and freely move along the axial direction in the hand-held sleeve 1 and the rear end sleeve 9, and finally, an equilibrium state is achieved.

Example 2

Referring to fig. 22, a pen type indwelling needle with a shield needle eccentric blade is different from embodiment 1 in that the catheter hub assembly 10 of embodiment 1 is replaced with a three-way catheter hub assembly 11.

Referring to fig. 23, the three-way conduit socket assembly 11 belongs to the prior art, the three-way conduit socket assembly 11 includes a three-way conduit socket 1101, a conduit 1102, a metal wedge 1103 and an isolation plug 1104, compared with the conduit socket assembly 10 in embodiment 1, the three-way conduit socket 1101 has more bypass pipes, the isolation plug 1104 is installed in the three-way conduit socket 1101 and located at the rear side of the bypass pipes, and the isolation plug 1104 and the three-way conduit socket 1101 are assembled in an interference fit manner.

The penholder type indwelling needle can further comprise an infusion hose assembly, the infusion hose assembly comprises an infusion hose, a hemostatic clamp, an infusion joint, a heparin cap and an end cap, and the infusion hose assembly belongs to the prior art, so that the specific structure of each component and the connection relationship among the components are not repeated.

It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims

1. The utility model provides a pen-holder type indwelling needle with eccentric separation blade of shielding needle which characterized in that includes:

the filtering plug is arranged in the exhaust hole of the needle base;

2. The penholder type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein a guide groove is formed in a side wall of the front portion of the handheld sleeve, the guide groove axially extends from the front end face of the handheld sleeve to the front annular stop step or the button sliding groove, a guide groove buckle is formed in the guide groove, and the guide groove buckle is located between the front end face of the handheld sleeve and the front annular stop step; the outer wall of the connector seat body part of the conduit seat connector is provided with a guide bulge, and the guide bulge is in guide fit with the guide groove of the handheld sleeve and is in buckle fit with the guide groove of the handheld sleeve.

3. The penholder-type indwelling needle with shield over-center catch according to claim 1, wherein the rear portion of the hand-held cannula and the front portion of the rear-end cannula are connected by a snap fit.

4. The pen-type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein a stop protrusion is provided on a side wall of the front cavity of the hub body of the catheter hub connector, and the stop protrusion cooperates with an outer wall of the rear end of the catheter hub to limit circumferential rotation of the catheter hub.

5. The pen-type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein the hub portion of the catheter hub adapter is in the form of a tapered spline shaft with a small end facing forward, and the catheter hub of the catheter hub assembly has a tapered bore therein for mating with the hub portion of the catheter hub adapter.

6. The penholder type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein the brake button comprises a button portion and a sliding piece portion, the button portion is disposed outside a button sliding groove of the handheld sleeve and connected with one end of the sliding piece portion, the sliding piece portion is slidably mounted in the button sliding groove, the lock hole bayonet and the lock hole flaring are opened on the sliding piece portion, the lock hole bayonet is close to the other end of the sliding piece portion, and the protruding block is protruded forwards and disposed at an edge of the lock hole bayonet.

7. The penholder type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein the brake button is provided with a beam protruding from the surface, the beam extends along a direction perpendicular to the sliding direction of the brake button, and the beam and the button sliding groove of the hand-held sleeve are assembled in a transition fit manner.

8. The pen-type indwelling needle with the shielding needle eccentric blade according to claim 1, wherein the rotational notch of the hub extends axially from the front end face of the hub to the locking notch.

9. The penholder-type indwelling needle with the shielding needle eccentric baffle according to claim 1, wherein a conical slope is provided between the rear inner wall of the rear end sleeve and the end hole.

10. The penholder-type indwelling needle with the shielding needle eccentric baffle according to any one of claims 1 to 9, wherein the catheter holder assembly is replaced with a three-way catheter holder assembly comprising a three-way catheter holder, a catheter, a metal wedge, an isolating plug.