WO2015006892A1 - 体外输液导管止流开关 - Google Patents

体外输液导管止流开关 Download PDF

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Publication number
WO2015006892A1
WO2015006892A1 PCT/CN2013/079338 CN2013079338W WO2015006892A1 WO 2015006892 A1 WO2015006892 A1 WO 2015006892A1 CN 2013079338 W CN2013079338 W CN 2013079338W WO 2015006892 A1 WO2015006892 A1 WO 2015006892A1
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WO
WIPO (PCT)
Prior art keywords
joint
infusion
joint body
inner cavity
joint base
Prior art date
Application number
PCT/CN2013/079338
Other languages
English (en)
French (fr)
Inventor
张建铭
Original Assignee
Zhang Jianming
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhang Jianming filed Critical Zhang Jianming
Priority to PCT/CN2013/079338 priority Critical patent/WO2015006892A1/zh
Publication of WO2015006892A1 publication Critical patent/WO2015006892A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M2039/226—Spindles or actuating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M2039/229—Stopcocks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes

Definitions

  • the present invention relates to a device for introducing a medium into a body, and more particularly to an in vitro infusion catheter stop switch.
  • the catheter at both ends of the stop clip is inevitably pressed by hand, especially the catheter at the front of the stop clip (near the end of the human body) will generate negative pressure due to the release of the hand-held compression, blood It will flow back into the catheter from the blood vessel, causing blood to clot and block the catheter, unable to infuse again, and severe thrombosis may occur, causing damage to the patient.
  • the catheter assembly is placed on the patient's body, and the length of the catheter is limited. If the catheter is inadvertently pulled, the catheter assembly will be pulled out of the patient's body. In order to avoid the above accident, the medical staff should be cautious when operating, sometimes stop the flow. If the length is not enough, it is still not guaranteed to drive the blood inside the catheter clean. Therefore, this operation mode is cumbersome, and the workload and psychological burden of the medical staff are greatly increased, and the negative pressure phenomenon cannot be completely eliminated.
  • the object of the present invention is to overcome the deficiencies of the prior art and to provide an in vitro infusion catheter stop switch which can eliminate the effective elimination of negative pressure and is convenient to operate.
  • the object of the present invention is achieved by the following route.
  • the in vitro infusion catheter stop switch has the following components: a joint base and a joint body, the front end of the joint base is connected to the infusion conduit or connected to the infusion member on the infusion line, and the rear end of the joint body is connected with the infusion catheter.
  • the front section of the joint body is sleeved in the inner cavity of the joint base in a pushable and retractable manner, and the joint body and the inner cavity of the joint base have a space for pushing the joint body, and the joint body cavity passes through a shut-off valve and a joint base.
  • the inner chamber is connected, and the shutoff valve is disposed in the joint body propulsion space and the shutoff valve is closed by the joint body that is advanced in position.
  • the inner cavity of the joint base forms a closed cavity, and the volume of the closed cavity is changed by the advancement and retreat of the axial displacement of the joint body.
  • the closed cavity is enlarged; the joint body is advanced, the closed cavity is reduced, the push is advanced, and the infusion channel is cut off.
  • the joint body is retracted first, the shut-off valve is opened, and the closed cavity is enlarged to facilitate the accommodation of more liquid.
  • the needle tube is withdrawn, the joint body is advanced, and the closed cavity is enlarged from large to small, thereby filling the negative pressure. Space to prevent negative pressure or to expel blood from the catheter into the blood vessel to eliminate negative pressure.
  • This method of preventing negative pressure and eliminating negative pressure is simple, effective, and convenient to operate.
  • the intervention of the stop valve eliminates the negative pressure and cuts off the infusion channel, which is not only more sanitary and safe, but also ensures that the connector body must be retracted before re-infusion (otherwise the valve is closed and cannot be infused).
  • the joint body After the infusion, the joint body has a space for advancement to eliminate the negative pressure.
  • the process of gradually intercepting as the joint body advances makes the shut-off valve also function as a flow regulating valve.
  • This extracorporeal infusion catheter stop switch can be widely used on infusion sets as well as in indwelling catheters and catheters of other medical infusion devices.
  • the object of the present invention can also be achieved by the following means.
  • the infusion member on the infusion line is a member having an infusion channel in the interior of the infusion catheter.
  • the infusion member can be an indwelling needle catheter assembly.
  • the stop switch of the present invention can be infinitely approached forward or backward to the other on the infusion line.
  • the member, thereby omitting the spanning connection of the partial infusion catheter, makes the overall structure of the infusion device more compact.
  • the front section of the connector body can be placed in the lumen of the connector base in a variety of ways:
  • the device for adjusting the axial displacement of the spiral has a variety of specific configurations to choose from, two of which are disclosed below, one of which is:
  • the front section of the connector body is inserted into the inner cavity of the joint base and is screwed to the joint base.
  • rotating the joint body causes the joint body to spirally rotate relative to the joint base, thereby causing the joint body to advance spirally and spirally backward relative to the joint base.
  • the other is:
  • the joint body is composed of a screw rod and a lifting head.
  • the front part of the screw rod is inserted into the inner cavity of the lifting head and is spirally connected thereto.
  • the screw rod is also axially connected with the joint base, and the lifting head is slidable back and forth with respect to the joint base.
  • the method is disposed in the inner cavity of the joint base, the rear end of the inner cavity of the lifting head is connected with the infusion conduit, and the front end is communicated with the infusion conduit connected to the inner cavity of the joint base through the shutoff valve.
  • the spiral rotation is decomposed into idling and forward and backward movement, wherein the idling is completed by the auger, and the forward and backward movement is performed by the lifting head.
  • the joint body is composed of a screw rod and a lifting head, and the tail end of the screw rod is exposed outside the joint base, and the front portion is inserted in the inner cavity of the joint base and is axially limitedly connected with the joint base, and the lifting head is opposite to the joint base.
  • the front and rear sliding manner is sleeved in the inner cavity of the joint base, and the front part of the lifting head is sleeved with the inner cavity of the joint base before the spiral rod, and the middle portion is radially retracted and extends into the inner cavity of the screw rod and adjusts the spiral
  • the device is screwed to the auger, and the posterior segment passes through the lumen of the auger and is connected to the infusion catheter.
  • An inner seal is disposed in front of the joint body and the joint base screw connection section.
  • the thread for achieving advance and retreat adjustment is a trapezoidal thread.
  • the front section of the joint body can also be placed in the interior of the joint base in this manner:
  • the front section of the joint body is inserted into the inner cavity of the joint base in a telescopic sliding manner.
  • the front section of the joint body and the inner cavity of the joint base have a sealing ring, and a damped fitting connection is made by a seal ring between the two.
  • This damped mating connection provides both a seal and a hand-feel and viscous joint body.
  • a snap device for defining a slip-in position of the joint body that is difficult to axially displace, the snap device being mounted between the joint body and the joint base cavity.
  • the snap device can be used to position the joint body so that it is not easily axially displaced.
  • the snap device has a variety of specific configurations to choose from, two of which are disclosed below, one of which is:
  • the buckle device is an elastic buckle, which is composed of a buckle, a spring, and a corresponding card slot disposed on the side wall of the joint body, and is buckled and slipped by the preload of the spring.
  • the card slot that is moved into place is stuck.
  • the elastic buckle can realize the positioning and can be disengaged under the action of the pushing and pulling force.
  • the other is:
  • the front part of the joint body is retractably slipped and rotatably inserted into the inner cavity of the joint base, and the buckle device is composed of a bayonet and a sliding groove, and the latch is exposed on the side wall of the joint body, and the sliding groove is correspondingly disposed on the joint
  • the sliding groove is composed of an axial groove and a transverse groove, and the protruding pin head is sleeved in the sliding groove, and the joint body which is moved in the axial groove is inserted into the transverse groove by rotating the sliding sleeve In the middle, it is axially engaged with the joint base.
  • the transverse grooves have a slope, but the oblique angle is smaller than the self-locking angle.
  • the inclination facilitates the introduction of the axial groove, and the smaller than the self-locking angle prevents it from sliding by itself under the action of the axial force.
  • shut-off valve Further optimization of the shut-off valve is:
  • the valve flap of the shut-off valve is located at the end of the joint body, and the sealing surface of the shut-off valve is located on the inner wall of the joint base.
  • the joint body is again a valve stem.
  • the inner cavity of the joint comprises a vertical passage and a transverse passage, the rear end of the vertical passage communicates with the infusion conduit, the front end is blind and communicates with the transverse passage, the transverse passage is located in the inner core of the joint body, and the end of the joint body is smaller than the inner cavity of the joint base
  • the gap between the two serves as an infusion channel communicating with the lateral channel
  • the end of the connector body is tapered and serves as a valve flap of the shut-off valve
  • the inner wall of the joint base is a circle corresponding to the cone.
  • the table-shaped step serves as a sealing surface of the shut-off valve, and the inward opening of the truncated-shaped step is an infusion passage port.
  • the shut-off valve When the tapered end of the joint body is in contact with the corresponding tapered step, the shut-off valve is closed; and when the joint body is retracted, the shut-off valve is opened, and the infusion enters the tapered step through the vertical passage of the joint body, the transverse passage, and the radial gap. Internal contraction.
  • the inner cavity of the joint base has a stepped shape
  • the corresponding joint body also has a stepped shaft shape and is sleeved with a corresponding portion of the inner cavity of the joint base.
  • the other is:
  • the inner cavity of the joint includes a vertical passage
  • the valve flap is a plurality of elastic tongues wrapped around the end of the joint body
  • the inner wall of the joint base is a step corresponding to the closed shape of the plurality of elastic flaps
  • the inner mouth of the step is an infusion channel.
  • the inner cavity of the joint includes a vertical passage, and the valve flap is located at a vertical passage opening of the joint body end, and the inner wall of the joint base is a pointed cone or a truncated cone which protrudes in the direction of the joint body.
  • the wall is distributed with a plurality of infusion channels at a circumferential position around the vertical passage opening.
  • the protruding portion of the tapered or truncated-shaped retaining wall projects into the vertical passage of the joint body and is blocked by the advancement of the joint body. It is cut off at the vertical passage opening.
  • the infusion passage on the retaining wall is located at the periphery of the vertical passage opening, that is, in the region outside the diameter of the vertical passage opening, such that when the central portion of the retaining wall is blocked in the vertical passage opening, the retaining wall The infusion channel cannot be connected to the vertical channel and is thus blocked.
  • the front end of the joint body is covered with a plastic body.
  • the front part of the plastic body has a truncated cone shape and the rear section has a short cylindrical shape.
  • the corresponding part in the inner cavity of the joint base is conjugate with the shape, and the plastic body and the conjugate cavity are cut off.
  • a valve wherein the plastic body is a shut-off valve flap, the conjugate cavity is a sealing valve sealing surface, and the plastic body is tightly coupled with the conjugate cavity, and is squeezed into the conjugate cavity by the elasticity of the plastic body, thereby
  • the joint base and the lifting head can be relatively fixed while the shut-off valve is closed.
  • the inner cavity of the joint penetrates front and rear, and the rear end of the joint communicates with the lumen of the infusion catheter.
  • the front end is covered by the plastic body and cuts off into a blind hole.
  • the passage is a vertical passage, and a vertical passage is passed through the blind end of the vertical passage.
  • the channel constitutes a transverse channel, and the inner cavity of the joint base after the conjugate cavity is stepped enlarged, and there is a gap between the backward plastic body and the step surface, and the gap crosses the lateral channel and the infusion connected with the inner cavity of the joint base Catheter lumen.
  • the present invention has the following advantages over the prior art: the method of preventing negative pressure and eliminating negative pressure is simple, effective, and convenient to operate.
  • the intervention of the stop valve eliminates the negative pressure and cuts off the infusion channel, which is not only more sanitary and safe, but also ensures that the connector body must be retracted before re-infusion (otherwise the valve is closed and cannot be infused).
  • the joint body After the infusion, the joint body has a space for advancement to eliminate the negative pressure.
  • the process of gradually intercepting as the joint body advances makes the shut-off valve also function as a flow regulating valve.
  • FIG. 1 is a schematic view showing the structure of a prior art in-situ indwelling catheter clamped on an indwelling catheter.
  • FIG. 2 is a schematic view showing the structure of an indwelling needle using the in vitro infusion catheter stop switch according to the first embodiment of the present invention.
  • FIG. 3 is a schematic view showing the appearance of an indwelling needle using the in vitro infusion catheter stop switch according to the first embodiment of the present invention.
  • FIG. 4 is a schematic structural view of the in vitro infusion catheter stop switch in the open state according to the first embodiment of the present invention.
  • FIG. 5 is a structural schematic view of the in vitro infusion catheter stop switch according to the first embodiment of the present invention in an off state.
  • Fig. 6 is a schematic perspective view showing the structure of a joint body in the in vitro infusion catheter stop switch according to the first embodiment of the present invention.
  • FIG. 7 is a schematic view showing the structure of an indwelling needle using the in vitro infusion catheter stop switch according to the second embodiment of the present invention.
  • Figure 8 is a schematic view showing the appearance of an indwelling needle using the in vitro infusion catheter stop switch according to the second embodiment of the present invention.
  • FIG. 9 is a schematic view showing the structure of an indwelling needle using the in vitro infusion catheter stop switch according to the third embodiment of the present invention.
  • FIG. 10 is a structural schematic view showing the in vitro infusion catheter stop switch in the open state according to the third embodiment of the present invention.
  • FIG. 11 is a schematic structural view of the in vitro infusion catheter stop switch according to the third embodiment of the present invention in an off state.
  • FIG. 12 is a structural schematic view showing the in vitro infusion catheter stop switch in the open state according to the fourth embodiment of the present invention.
  • FIG. 13 is a structural schematic view showing the in vitro infusion catheter stop switch of the fourth embodiment of the present invention in an off state.
  • Figure 14 is a schematic view showing the structure of the in vitro infusion catheter stop switch in the open state according to the preferred embodiment of the present invention.
  • conduit assembly 1 conduit assembly 2 connector body 21 auger 22 lifting head 23 vertical channel 24 bayonet 25 transverse channel 26 Clearance 27 Spline 3 Connector base 31 Adjustment screw 32 Slot groove 4 Infusion tube 5 Sealant plug 6 Seal ring 7 Globe valve 71 Disc 72 Seal face stop clamp.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • an indwelling needle using the extracorporeal infusion catheter of the present invention the catheter assembly 1, the connector body 2, and the connector base 3, infusion catheter 4 and sealant plug 5 and so on.
  • the in vitro infusion catheter stop switch comprises a joint base 3 and a joint body 2, and a joint base 3
  • the front end is connected to the infusion catheter 4
  • the rear end of the joint body 2 is connected to the infusion catheter 4
  • the front section of the joint body 2 is inserted into the inner cavity of the joint base 3 in a telescopic sliding manner.
  • Connector body 2 front section and joint base 3 The inner chamber has a sealing ring 6 and a damped mating connection is made by a sealing ring 6 therebetween.
  • the joint body 2 and the joint base 3 have a joint body 2 between the inner cavity and the joint body 2
  • the inner chamber communicates with the inner chamber of the joint base 3 via a shut-off valve 7, which is disposed in the advancement space of the joint body 2 and completes the shutoff of the shut-off valve 7 by the joint body 2 advanced in position.
  • Connector body 2 The inner cavity includes a vertical passage 23 and a transverse passage 25, and the rear end of the vertical passage 23 communicates with the infusion conduit 4, the front end is blind and communicates with the transverse passage 25, and the transverse passage 25 is located at the joint body 2 The end is in the inner core.
  • the joint base 3 has a stepped shape in the inner cavity
  • the corresponding joint body 2 also has a stepped shaft shape and is sleeved with the corresponding portion of the inner cavity of the joint base 3, and the joint body 2
  • the end of the small-diameter joint body corresponds to the inner cavity of the large-diameter joint base, and the gap 26 between the two serves as an infusion passage communicating with the lateral passage.
  • the portion is still sleeved with the small-diameter joint base inner cavity to better support the joint body 2, but the flower groove of the spline portion is connected to the gap 26 and the joint base 3 inner cavity and thereby the joint base 3
  • the infusion catheter 4 in front is connected.
  • the joint body 2 has a truncated cone shape and serves as a flap 71 of the shutoff valve 7, and the joint base 3
  • the inner cavity retaining wall is a truncated cone shaped step corresponding to the frustum shape and serves as a sealing surface 72 of the shutoff valve, and the inner constricted opening of the truncated cone shaped step is an infusion passage port.
  • the shut-off valve When the taper-shaped end of the joint body is in contact with the corresponding tapered step, the shut-off valve is closed; and when the joint body is retracted, the shut-off valve is opened, and the infusion is vertically through the joint body 23, the transverse channel 25, the radial clearance 26, the spline 27 slot and enter the conical step inside the constriction.
  • a buckle device for defining that the joint body that is slipped in place is difficult to be axially displaced, and the buckle device is mounted on the joint 2 Between the inner cavity of the connector base 3.
  • the buckle device is composed of a bayonet 24 and a sliding slot 32, and the latching pin 24 is exposed on the side wall of the joint body 2, and the sliding slot 32 Correspondingly disposed on the side wall of the joint base 3, the sliding groove 32 is composed of an axial groove and a transverse groove, and the protruding bayonet 24 is sleeved in the sliding groove, and the joint body is pushed into position along the axial groove 2 It is axially engaged with the joint base 3 by rotating the sliding sleeve into the transverse groove.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the external infusion catheter stop switch is applied to the indwelling needle. Unlike the first embodiment, the front end of the joint base 3 in this embodiment is directly connected to the catheter assembly 1 of the indwelling needle.
  • the number of bits in this embodiment is the same as that in the first embodiment.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 9 Figure 10 and Figure 11
  • the in vitro infusion catheter stop switch is applied to the indwelling needle.
  • the front portion of the joint body is inserted into the inner cavity of the joint base and passes through Spiral adjustment device 31 Spiral connection with the joint base.
  • the rotating joint body 2 causes the joint body 2 to spirally rotate relative to the joint base 3, thereby causing the joint body to advance spirally and spirally backward with respect to the joint base.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • an in vitro infusion catheter stop switch having an adjustment screw device 31
  • the stop switch is applied to the infusion set, and the front portion of the joint body is inserted into the inner cavity of the joint base and is screwed to the joint base 3 through the adjusting screw device 31.
  • the joint base 3 is rotated in a spiral, so that the joint body is spirally advanced and spirally retracted relative to the joint base.
  • the inner body of the joint body 2 includes a vertical passage 23, and the inner core of the joint body 2 is axially penetrated to form a vertical passage 23
  • the rear end of the vertical passage 23 communicates with the infusion conduit 4 lumen
  • the shutoff valve flap 71 is a plurality of elastic flaps covering the front end of the joint body 2, and the joint base 3
  • the inner cavity retaining wall is a step corresponding to the closed shape of the plurality of elastic flaps and serves as a shutoff valve sealing sealing surface 72
  • the inner mouth of the step is an infusion channel.
  • the joint body 2 is advanced into position, the elastic flap is closed, and the shutoff valve 7 is closed; the joint body 2 After retraction, the elastic flap opens due to its own elasticity, and the shut-off valve 7 is opened.
  • an infusion catheter stop switch is applied to the infusion set, and the joint body 2 is composed of a screw rod 21 and a lifting head. 22 Composition, the end of the auger 21 is exposed outside the joint base 3, and the front section is inserted into the inner cavity of the joint base 3 and is axially connected to the joint base 3.
  • Lifting head 22 with opposite joint base 3 The front and rear sliding manner is sleeved in the inner cavity of the joint base 3, and the front portion of the lifting head 22 is sleeved with the inner cavity of the joint base 3 before the auger 21, and the middle portion is radially retracted and extends into the auger 21
  • the inner cavity is screwed to the auger by the adjusting screw device 31, and the rear portion passes through the inner cavity of the auger and is connected with the infusion catheter 4, and a sealing ring is arranged between the front section of the lifting head 22 and the inner cavity of the joint base 3 .
  • the lifting head 22 has a vertical passage 23 and a transverse passage 25, and the inner cavity of the lifting head 22 is penetrated back and forth, and the rear end thereof and the infusion conduit 4 The lumen is connected, and the front end is covered by a plastic body to be cut into a blind hole.
  • the passage is a vertical passage 23, and a horizontal passage 25 is formed through a passage in a radial direction at the blind end of the vertical passage 23.
  • the front end of the plastic body covered with a front end has a truncated cone shape, and the rear end has a short cylindrical shape, and a corresponding portion in the inner cavity of the joint base 3 is conjugated with the shape, and the plastic body and the conjugate cavity form a shutoff valve 7, wherein the plastic body Body is the stop valve flap 71
  • the conjugate cavity is a shutoff valve sealing surface 72.
  • the plastic body is tightly coupled with the conjugate cavity, and is squeezed into the conjugate cavity by the elasticity of the plastic body, thereby simultaneously fixing the joint base 3 and the lifting head while closing the shutoff valve twenty two .
  • the lifting head 22 is telescopically stretched forward and backward, and is advanced to the positional stop valve 7 to be closed, and to be retracted, the shut-off valve 7 Open.

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  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
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Abstract

一种体外输液导管的止流开关，包括接头基座（3）和接头体（2），接头基座（3）前端或者与输液导管（4）接驳或者与输液管路上的输液构件接驳，接头体（2）后端与输液导管（4）接驳，接头体（2）前段以可推进及后退的方式套置在接头基座（3）内腔中。该体外输液导管止流开关的优点在于防止和消除负压的方式简单、有效、操作方便；截止阀（7）的介入使得在消除负压的同时又截止了输液通道，不但更加卫生、安全，而且从结构上确保再次输液时必须先退后接头体（2），使得输液结束后接头体（2）具有推进的空间以消除负压；而随着接头体推进而逐渐截流的过程，使得截止阀也具有流量调节阀的作用。

Description

体外输液导管止流开关 说明书正文
技术领域
本发明涉及一种将介质引入体内的装置，特别是一种体外输液导管止流开关。
背景技术
在临床医疗进行输液时，需要在输液导管上套上一个止流夹以作为止流开关，具体示意可见附图 1 。当输液结束操作止流夹时，需一手持握止流夹两头的导管、另一手横向移动止流夹使止流夹的钳口钳夹导管以止流。操作时，止流夹两头的导管难以避免的会因手持而被压迫，特别是止流夹前头（靠近人体的端头）的导管将因这种手持压迫后的放开而产生负压，血液会从血管倒流进导管内，造成血液凝固堵塞导管，无法再次输液，严重的可能产生血栓，给病患造成伤害。为了弥补这种不足，习惯上在别上止流夹夹紧导管后，需要将止流夹往导管组件方向滑动，令导管逐渐被挤压，赶出倒流血液，但止流夹与导管夹紧时滑动阻力大，拉拔导管，易将导管从钳口中拉出，造成更大的负压，同时也易将导管拉长变细，经多次拉拔，严重的会拉断导管而造成溢血，加上导管组件留置粘贴在病患身体上，导管长度有限，要是拉拔不慎，会将导管组件拉脱离病患身体，为了避免上述事故发生，医务人员操作时谨小慎微，有时止流夹拉拔长度不够，还是不能完全保证将导管内血液驱赶干净。故这种操作方式繁琐、对医护人员工作量和心理负担都增加较大、且尚不能完全有效消除负压现象。
发明内容
本发明目的在于克服现有技术的不足之处而提供一种可以消除有效消除负压且操作方便的体外输液导管止流开关。
本发明的目的是通过以下途径来实现的。
体外输液导管止流开关，其组成要点在于：包括接头基座和接头体，接头基座前端或者与输液导管接驳或者与输液管路上的输液构件接驳，接头体后端与输液导管接驳，接头体前段以可推进及后退的方式套置在接头基座内腔中，接头体与接头基座内腔之间具有接头体推进的空间，接头体内腔通过一种截止阀与接头基座内腔连通，此截止阀设置在上述接头体推进空间中并藉着推进到位的接头体完成截止阀的关断。
这样接头基座内腔构成一密闭型腔，利用接头体轴向推移的进退改变密闭型腔容积大小。接头体退后，密闭型腔增大；接头体推进，密闭型腔减小，推进到位，输液通道截止。输液工作时，接头体先退后，截止阀打开，密闭型腔增大，便于容纳更多液体；输液结束针管退出同时，接头体推进，密闭型腔由大变小，从而填补产生负压的空间，防止负压或者排出导管内血液进入血管以消除负压。这种防止负压及消除负压的方式简单、有效、操作方便。而截止阀的介入，在消除负压的同时又截止了输液通道，不但更加卫生、安全，而且从结构上确保了再次输液时必须先退后接头体（否则截止阀截止，无法输液），使得输液结束后接头体具有推进的空间以消除负压。而随着接头体推进而渐次截流的过程，使得截止阀也具有流量调节阀的作用。
这种体外输液导管止流开关可以广泛应用在输液器上以及留置导管上以及其他医疗输液装置的导管上。
本发明的目的还可以通过以下途径来实现。
所述输液管路上的输液构件是输液导管以外的内中具有输液通道的构件。在留置针上，这种输液构件可以是留置针导管组件。
由于截止开关是在接头基座中，而不是如止流夹般直接在输液导管上操作，这样，使得本发明所述的这种止流开关可以向前或向后无限逼近输液管路上的其他构件，从而省略部分输液导管的跨接接驳，使输液装置整体结构更加紧凑。
接头体前段可以有多种方式套置在接头基座内腔中：
还包括有一种螺旋调节轴向推移的装置，藉着这种装置接头体得以以可推进及后退的方式与接头基座进行套接。
这样通过螺旋调节轴向推移的装置实现接头体相对接头基座的轴向的推移和后退。
螺旋调节轴向推移的装置有多种具体的构造可供选择，以下公开其中的两种，一种是：
接头体前段插置在接头基座内腔中并与接头基座螺旋连接。
这样，转动接头体让接头体相对接头基座螺旋转动，从而让接头体相对接头基座螺旋式前进和螺旋式后退。
另一种是：
接头体由螺旋杆和升降头组成，螺旋杆前段插置在升降头内腔中并与其螺旋连接，螺旋杆还与接头基座轴向限位连接，升降头以可相对接头基座前后滑移的方式套置在接头基座的内腔中，升降头内腔后端与输液导管接驳、前端通过截止阀与和接头基座内腔接驳的输液导管连通。
这样，由于螺旋杆被轴向限位，螺旋转动被分解成空转和前后移动，其中空转由螺旋杆完成，前后移动则由升降头完成。又或者：
接头体由螺旋杆和升降头组成，螺旋杆尾端外露在接头基座外，其前段插置在接头基座内腔中并与接头基座轴向限位连接，升降头以可相对接头基座前后滑移的方式套置在接头基座的内腔中，升降头前段与螺旋杆之前的接头基座内腔套接，其中段径向内缩后伸入螺旋杆内腔并通过调节螺旋装置与螺旋杆螺旋连接，其后段穿出螺旋杆内腔后与输液导管接驳。
接头体与接头基座螺旋连接段的前方设置有一种内密封件。
上述实现进退调节的螺纹最好是一种梯形螺纹。
除了螺旋调节轴向推移的装置以外，接头体前段还可以以这种方式套置在接头基座内腔中：
接头体前段以可伸缩滑移方式插置在接头基座内腔中。
进一步优化是：
接头体前段与接头基座内腔具有密封圈，并藉着二者之间的密封圈进行带有阻尼的配合连接。
这种带有阻尼的配合连接既可以实现密封，也可以增强手感并可粘滞接头体。
还包括有一种用于限定滑移到位的接头体难以再轴向移位的卡扣装置，此卡扣装置安装在接头体与接头基座内腔之间。
无论是退后还是推进的接头体，一旦滑移到位，在下次输液作业之前希望不再滑动该接头体，卡扣装置可用于定位接头体使其不易自行轴向移位。
这种卡扣装置有多种具体的构造可供选择，以下公开其中的两种，一种是：
卡扣装置是一种弹性卡扣，由嵌置在接头基座侧壁上的卡扣、弹簧以及对应设置在接头体侧壁上的卡槽组成，藉着弹簧的预紧力卡扣与滑移到位的卡槽卡接。
这种弹性卡扣即可实现定位，又可在推拉力的作用下脱离卡接。
另一种是：
接头体前段以可伸缩滑移且可转动方式插置在接头基座内腔中，卡扣装置由卡销及滑动槽组成，卡销突露在接头体侧壁上，滑动槽对应设置在接头基座内腔侧壁上，滑动槽由轴向槽和横向槽组成，突露的卡销头滑套在滑动槽中，沿着轴向槽推移到位的接头体藉着转动滑套入横向槽中而与接头基座轴向卡接。
横向槽具有斜度，但斜角小于自锁角。
斜度便于导引入轴向槽，而小于自锁角可防止其在轴向力的作用下自行滑动。
关于截止阀的进一步优化是：
截止阀的阀瓣位于接头体端头，截止阀密封面位于接头基座内腔止进壁上。
这样，接头体又是阀杆。
进一步优化可以是以下几种具体构造，其中还一种是：
接头体内腔包括竖向通道和横向通道，竖向通道后端与输液导管连通，前端盲止并与横向通道连通，横向通道位于接头体端部内芯中，接头体端部小于接头基座内腔，二者之间的间隙作为输液通道与横向通道连通，接头体端头呈一种锥形并作为截止阀的阀瓣，接头基座内腔止进壁是一种与该锥形对应的圆台形台阶并作为截止阀的密封面，该圆台形台阶的内缩口是输液通道口。
当接头体锥形端头与对应的锥形台阶触接时，截止阀闭合；而当接头体后退，截止阀开启，输液经由接头体竖向通道、横向通道、径向间隙而进入锥形台阶内缩口。
或者更具体为：
接头基座内腔呈一种阶梯形，对应的接头体也呈一种阶梯轴状并与接头基座内腔的对应部位套接，当接头体后缩时，小径的接头体端部与大径的接头基座内腔对应，二者之间的间隙作为输液通道与横向通道连通，此时，接头体端部的花键部位尚与小径的接头基座内腔套接并支撑着接头体，但花键部位的花槽跨接连通着间隙和接头基座内腔并进而得以与接头基座前方的输液导管连通。
另一种是：
接头体内腔包括竖向通道，阀瓣是一种包覆在接头体端头的复数个弹性舌瓣，接头基座内腔止进壁是一种与该复数个弹性舌瓣闭合形状对应的台阶，台阶内口是输液通道，藉着与该台阶的触接，复数个弹性舌瓣闭合并封堵截止在接头体竖向通道口。
这样，接头体推进到位，弹性舌瓣闭合，截止阀截止；接头体后退抬起，弹性舌瓣因自身弹性而打开，截止阀开启。
还有一种是：
接头体内腔包括竖向通道，阀瓣位于接头体端头的竖向通道口，接头基座内腔止进壁是一种中部往接头体方向突凸的尖锥形或圆台形，该止进壁在竖向通道口外围的圆周位置上分布有复数个输液通道，藉着接头体的推进，该尖锥形或圆台形的止进壁突凸中部伸入到接头体竖向通道并封堵截止在该竖向通道口。
由于止进壁上的输液通道位于竖向通道口的外围，即位于竖向通道口口径以外的区域，这样，当止进壁突凸中部封堵在竖向通道口时，该止进壁上的输液通道无法与竖向通道连通，从而被截止。
再有一种是：
接头体前端包覆有一种塑胶体，此塑胶体前段呈圆台形、后段呈短圆柱形，接头基座内腔中的对应部位与该形状共轭，该塑胶体以及该共轭腔组成截止阀，其中该塑胶体为截止阀阀瓣，该共轭腔为截止阀密封面，该塑胶体与该共轭腔紧配合连接，利用塑胶体的弹性将其挤入该共轭腔中，从而在关断截止阀的同时又能相对固定接头基座和升降头。
进一步优化是：
接头体内腔前后贯穿，其后端与输液导管管腔连通，其前端被塑胶体包覆后而截止成盲孔，该通道即为竖向通道，在竖向通道盲孔端沿径向贯穿一通道组成横向通道，该共轭腔之后的接头基座内腔呈阶梯放大，后退的塑胶体与此阶梯面之间具有间隙，此间隙跨接横向通道和与接头基座内腔接驳的输液导管管腔。
综上所述，本发明相比现有技术具有如下优点：防止负压及消除负压的方式简单、有效、操作方便。而截止阀的介入，在消除负压的同时又截止了输液通道，不但更加卫生、安全，而且从结构上确保了再次输液时必须先退后接头体（否则截止阀截止，无法输液），使得输液结束后接头体具有推进的空间以消除负压。而随着接头体推进而渐次截流的过程，使得截止阀也具有流量调节阀的作用。
附图说明
图 1 是现有技术中一种止流夹夹设在体外留置导管上的结构示意图。
图 2 是使用本发明实施例一所述体外输液导管止流开关的留置针结构示意图。
图 3 是使用本发明实施例一所述体外输液导管止流开关的留置针外观示意图。
图 4 是本发明实施例一所述体外输液导管止流开关在开启状态的结构示意图。
图 5 是本发明实施例一所述体外输液导管止流开关在截止状态的结构示意图。
图 6 是本发明实施例一所述体外输液导管止流开关中的接头体结构示意立体图。
图 7 是使用本发明实施例二所述体外输液导管止流开关的留置针结构示意图。
图 8 是使用本发明实施例二所述体外输液导管止流开关的留置针外观示意图。
图 9 是使用本发明实施例三所述体外输液导管止流开关的留置针结构示意图。
图 10 是本发明实施例三所述体外输液导管止流开关在开启状态的结构示意图。
图 11 是本发明实施例三所述体外输液导管止流开关在截止状态的结构示意图。
图 12 是本发明实施例四所述体外输液导管止流开关在开启状态的结构示意图。
图 13 是本发明实施例四所述体外输液导管止流开关在截止状态的结构示意图。
图 14 是本发明最佳实施例所述体外输液导管止流开关在开启状态的结构示意图。
标号说明
1 导管组件 2 接头体 21 螺旋杆 22 升降头 23 竖向通道 24 卡销 25 横向通道 26 间隙 27 花键 3 接头基座 31 调节螺旋装置 32 滑动槽 4 输液导管 5 密封胶塞 6 密封圈 7 截止阀 71 阀瓣 72 密封面止流夹。
具体实施方式
实施例一：
参照图 2 ，一种使用本发明所述体外输液导管止流开关的留置针，由导管组件 1 、接头体 2 、接头基座 3 、输液导管 4 和密封胶塞 5 等组成。
参照图 4 、图 5 和图 6 ，体外输液导管止流开关，包括接头基座 3 和接头体 2 ，接头基座 3 前端与输液导管 4 接驳，接头体 2 后端与输液导管 4 接驳，接头体 2 前段以可伸缩滑移方式插置在接头基座 3 内腔中。接头体 2 前段与接头基座 3 内腔具有密封圈 6 ，并藉着二者之间的密封圈 6 进行带有阻尼的配合连接。接头体 2 与接头基座 3 内腔之间具有接头体 2 推进的空间，接头体 2 内腔通过一种截止阀 7 与接头基座 3 内腔连通，此截止阀 7 设置在上述接头体 2 推进空间中并藉着推进到位的接头体 2 完成截止阀 7 的关断。接头体 2 内腔包括竖向通道 23 和横向通道 25 ，竖向通道 23 后端与输液导管 4 连通，前端盲止并与横向通道 25 连通，横向通道 25 位于接头体 2 端部内芯中。接头基座 3 内腔呈一种阶梯形，对应的接头体 2 也呈一种阶梯轴状并与接头基座 3 内腔的对应部位套接，当接头体 2 后缩时，小径的接头体端部与大径的接头基座内腔对应，二者之间的间隙 26 作为输液通道与横向通道连通，此时，接头体 2 端部的花键 27 部位尚与小径的接头基座内腔套接，从而较好地支撑着接头体 2 ，但花键部位的花槽跨接连通着间隙 26 和接头基座 3 内腔并进而得以与接头基座 3 前方的输液导管 4 连通。接头体 2 端头呈一种锥台形并作为截止阀 7 的阀瓣 71 ，接头基座 3 内腔止进壁是一种与该锥台形对应的圆台形台阶并作为截止阀的密封面 72 ，该圆台形台阶的内缩口是输液通道口。
当接头体锥台形端头与对应的锥形台阶触接时，截止阀闭合；而当接头体后退，截止阀开启，输液经由接头体竖向通道 23 、横向通道 25 、径向间隙 26 、花键 27 槽而进入锥形台阶内缩口。
参照图 3 ，还包括有一种用于限定滑移到位的接头体难以再轴向移位的卡扣装置，此卡扣装置安装在接头 2 与接头基座 3 内腔之间。
卡扣装置由卡销 24 及滑动槽 32 组成，卡销 24 突露在接头体 2 侧壁上，滑动槽 32 对应设置在接头基座 3 侧壁上，滑动槽 32 由轴向槽和横向槽组成，突露的卡销 24 头滑套在滑动槽中，沿着轴向槽推移到位的接头体 2 藉着转动滑套入横向槽中而与接头基座 3 轴向卡接。
本实施例未述部分与现有技术相同。
实施例二：
参照图 7 和图 8 ，体外输液导管止流开关，将该止流开关应用在留置针上，与实施例一不同的是，本实施例中的接头基座 3 前端直接与留置针的导管组件 1 连接。
本实施例位数部分与实施例一相同。
实施例三：
参照图 9 、图 10 和图 11 ，体外输液导管止流开关，将该止流开关应用在留置针上，与实施例一不同的是，具有一种调节螺旋装置 31 ，接头体前段插置在接头基座内腔中并通过此螺旋调节装置 31 与与接头基座螺旋连接。这样，转动接头体 2 让接头体 2 相对接头基座 3 螺旋转动，从而让接头体相对接头基座螺旋式前进和螺旋式后退。
本实施例未述部分与实施例一在相同。
实施例四：
参照图 12 和图 13 ，体外输液导管止流开关，具有一种调节螺旋装置 31 ，将该止流开关应用在输液器上，接头体前段插置在接头基座内腔中并通过此调节螺旋装置 31 与接头基座 3 螺旋连接。这样，转动接头体 2 让接头体 2 相对接头基座 3 螺旋转动，从而让接头体相对接头基座螺旋式前进和螺旋式后退。接头体 2 内腔包括竖向通道 23 ，接头体 2 内芯轴向贯穿而组成竖向通道 23 ，该竖向通道 23 后端与输液导管 4 管腔连通，截止阀阀瓣 71 是一种包覆在接头体 2 前端头的复数个弹性舌瓣，接头基座 3 内腔止进壁是一种与该复数个弹性舌瓣闭合形状对应的台阶并作为截止阀密封密封面 72 ，台阶内口是输液通道，藉着与该台阶的触接，复数个弹性舌瓣闭合并封堵截止在接头体竖向通道 23 口。
这样，接头体 2 推进到位，弹性舌瓣闭合，截止阀 7 截止；接头体 2 后缩，弹性舌瓣因自身弹性而打开，截止阀 7 开启。
本实施例未述部分与实施例一在相同。
最佳实施例：
参照图 14 ，体外输液导管止流开关，将该止流开关应用在输液器上，接头体 2 由螺旋杆 21 和升降头 22 组成，螺旋杆 21 尾端外露在接头基座 3 外，其前段插置在接头基座 3 内腔中并与接头基座 3 轴向限位连接。升降头 22 以可相对接头基座 3 前后滑移的方式套置在接头基座 3 的内腔中，升降头 22 前段与螺旋杆 21 之前的接头基座 3 内腔套接，其中段径向内缩后伸入螺旋杆 21 内腔并通过调节螺旋装置 31 与螺旋杆螺旋连接，其后段穿出螺旋杆内腔后与输液导管 4 接驳，升降头 22 前段与接头基座 3 内腔之间设置有密封圈 6 。升降头 22 具有竖向通道 23 和横向通道 25 ，升降头 22 内腔前后贯穿，其后端与输液导管 4 管腔连通，其前端被一塑胶体包覆后而截止成盲孔，该通道即为竖向通道 23 ，在竖向通道 23 盲孔端沿径向贯穿一通道组成横向通道 25 。升降头 22 前端包覆的塑胶体前端呈圆台形、后端呈短圆柱形，接头基座 3 内腔中的对应部位与该形状共轭，该塑胶体以及该共轭腔组成截止阀 7 ，其中该塑胶体为截止阀阀瓣 71 ，该共轭腔为截止阀密封面 72 。该塑胶体与该共轭腔紧配合连接，利用塑胶体的弹性将其挤入该共轭腔中，从而在关断截止阀的同时又能相对固定接头基座 3 和升降头 22 。该共轭腔之后的接头基座 3 内腔呈阶梯放大，后退的塑胶体与此阶梯面之间具有间隙 26 ，此间隙 26 跨接横向通道 25 和与接头基座内腔接驳的输液导管 4 管腔。
这样，转动螺旋杆 21 ，升降头 22 前后伸缩，向前推进到位截止阀 7 截止，向后退，则截止阀 7 开启。
本实施例未述部分与实施例一相同。

Claims (22)

  1. 体外输液导管止流开关，其特征在于，包括接头基座和接头体，接头基座前端或者与输液导管接驳或者与输液管路上的输液构件接驳，接头体后端与输液导管接驳，接头体前段以可推进及后退的方式套置在接头基座内腔中，接头体与接头基座内腔之间具有接头体推进的空间，接头体内腔通过一种截止阀与接头基座内腔连通，此截止阀设置在上述接头体推进空间中并藉着推进到位的接头体完成截止阀的关断。
  2. 根据权利要求1所述的体外输液导管止流开关，其特征在于，所述输液管路上的输液构件是输液导管以外的内中具有输液通道的构件。
  3. 根据权利要求1所述的体外输液导管止流开关，其特征在于，所述输液管路上的输液构件是留置针导管组件。
  4. 根据权利要求1所述的体外输液导管止流开关，其特征在于，还包括有一种螺旋调节轴向推移的装置，藉着这种装置接头体得以以可推进及后退的方式与接头基座进行套接。
  5. 根据权利要求4所述的体外输液导管止流开关，其特征在于，接头体前段插置在接头基座内腔中并与接头基座螺旋连接。
  6. 根据权利要求4所述的体外输液导管止流开关，其特征在于，接头体由螺旋杆和升降头组成，螺旋杆前段插置在升降头内腔中并与其螺旋连接，螺旋杆还与接头基座轴向限位连接，升降头以可相对接头基座前后滑移的方式套置在接头基座的内腔中，升降头内腔后端与输液导管接驳、前端通过截止阀与和接头基座内腔接驳的输液导管连通。
  7. 根据权利要求4所述的体外输液导管止流开关，其特征在于，接头体由螺旋杆和升降头组成，螺旋杆尾端外露在接头基座外，其前段插置在接头基座内腔中并与接头基座轴向限位连接，升降头以可相对接头基座前后滑移的方式套置在接头基座的内腔中，升降头前段与螺旋杆之前的接头基座内腔套接，其中段径向内缩后伸入螺旋杆内腔并通过调节螺旋装置与螺旋杆螺旋连接，其后段穿出螺旋杆内腔后与输液导管接驳。
  8. 根据权利要求1或4或5或6或7所述的体外输液导管止流开关，其特征在于，接头体与接头基座螺旋连接段的前方设置有一种内密封件。
  9. 根据权利要求4或5或6或7所述的体外输液导管止流开关，其特征在于，上述实现进退调节的螺纹最好是一种梯形螺纹。
  10. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体前段以可伸缩滑移方式插置在接头基座内腔中。
  11. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体前段以可伸缩滑移方式插置在接头基座内腔中，接头体前段与接头基座内腔具有密封圈，并藉着二者之间的密封圈进行带有阻尼的配合连接。
  12. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体前段以可伸缩滑移方式插置在接头基座内腔中，还包括有一种用于限定滑移到位的接头体难以再轴向移位的卡扣装置，此卡扣装置安装在接头体与接头基座内腔之间。
  13. 根据权利要求12所述的体外输液导管止流开关，其特征在于，卡扣装置是一种弹性卡扣，由嵌置在接头基座侧壁上的卡扣、弹簧以及对应设置在接头体侧壁上的卡槽组成，藉着弹簧的预紧力卡扣与滑移到位的卡槽卡接。
  14. 根据权利要求12所述的体外输液导管止流开关，其特征在于，接头体前段以可伸缩滑移且可转动方式插置在接头基座内腔中，卡扣装置由卡销及滑动槽组成，卡销突露在接头体侧壁上，滑动槽对应设置在接头基座内腔侧壁上，滑动槽由轴向槽和横向槽组成，突露的卡销头滑套在滑动槽中，沿着轴向槽推移到位的接头体藉着转动滑套入横向槽中而与接头基座轴向卡接。
  15. 根据权利要求14所述的体外输液导管止流开关，其特征在于，横向槽具有斜度，但斜角小于自锁角。
  16. 根据权利要求1所述的体外输液导管止流开关，其特征在于，截止阀的阀瓣位于接头体端头，截止阀密封面位于接头基座内腔止进壁上。
  17. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体内腔包括竖向通道和横向通道，竖向通道后端与输液导管连通，前端盲止并与横向通道连通，横向通道位于接头体端部内芯中，接头体端部小于接头基座内腔，二者之间的间隙作为输液通道与横向通道连通，接头体端头呈一种锥形并作为截止阀的阀瓣，接头基座内腔止进壁是一种与该锥形对应的圆台形台阶并作为截止阀的密封面，该圆台形台阶的内缩口是输液通道口。
  18. 根据权利要求17所述的体外输液导管止流开关，其特征在于，接头基座内腔呈一种阶梯形，对应的接头体也呈一种阶梯轴状并与接头基座内腔的对应部位套接，当接头体后缩时，小径的接头体端部与大径的接头基座内腔对应，二者之间的间隙作为输液通道与横向通道连通，此时，接头体端部的花键部位尚与小径的接头基座内腔套接并支撑着接头体，但花键部位的花槽跨接连通着间隙和接头基座内腔并进而得以与接头基座前方的输液导管连通。
  19. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体内腔包括竖向通道，阀瓣是一种包覆在接头体端头的复数个弹性舌瓣，接头基座内腔止进壁是一种与该复数个弹性舌瓣闭合形状对应的台阶，台阶内口是输液通道，藉着与该台阶的触接，复数个弹性舌瓣闭合并封堵截止在接头体竖向通道口。
  20. 根据权利要求1所述的体外输液导管止流开关，其特征在于，接头体内腔包括竖向通道，阀瓣位于接头体端头的竖向通道口，接头基座内腔止进壁是一种中部往接头体方向突凸的尖锥形或圆台形，该止进壁在竖向通道口外围的圆周位置上分布有复数个输液通道，藉着接头体的推进，该尖锥形或圆台形的止进壁突凸中部伸入到接头体竖向通道并封堵截止在该竖向通道口。
  21. 根据权利要求1所述的体外输液导管止流开关，其特征在于， 接头体前端包覆有一种塑胶体，此塑胶体前段呈圆台形或圆锥形，接头基座内腔中的对应部位与该形状共轭，该塑胶体以及该共轭腔组成截止阀，其中该塑胶体为截止阀阀瓣，该共轭腔为截止阀密封面，该塑胶体与该共轭腔紧配合连接，利用塑胶体的弹性将其挤入该共轭腔中，从而在关断截止阀的同时又能相对固定接头基座和升降头。
  22. 根据权利要求21所述的体外输液导管止流开关，其特征在于， 接头体内腔前后贯穿，其后端与输液导管管腔连通，其前端被塑胶体包覆后而截止成盲孔，该通道即为竖向通道，在竖向通道盲孔端沿径向贯穿一通道组成横向通道，该共轭腔之后的接头基座内腔呈阶梯放大，后退的塑胶体与此阶梯面之间具有间隙，此间隙跨接横向通道和与接头基座内腔接驳的输液导管管腔。
PCT/CN2013/079338 2013-07-13 2013-07-13 体外输液导管止流开关 WO2015006892A1 (zh)

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