CN207855758U - A kind of puncture needle protection device and trochar - Google Patents

Abstract

The utility model discloses a kind of puncture needle protection devices comprising：Sleeve, the internal first passage with perforation be arranged along its axial direction, and along the second channel that is arranged of radial direction of sleeve, the first passage is used to house puncture needle；Pin is set in the second channel；Elastic membrane is set to the cartridge exterior, and is covered on the outside of the outer end of the pin, to apply thrust to pin；Wherein, when the pin is located at the first station, the outer end of pin is stretched out from second channel and is located at outside sleeve；When the puncture needle in first passage bounces back to pin position below, pin is pushed into second station by the elastic membrane along second channel towards the direction in sleeve, the pin blocks in second station or partial blockage first passage, to prevent the puncture needle in first passage to be pierced by via the first port of sleeve.In addition, the invention also discloses a kind of trochars with the puncture needle protection device.

Description

A kind of puncture needle protection device and trochar

Technical field

The utility model is related to a kind of medical instrument more particularly to a kind of devices being used cooperatively with puncture needle.

Background technology

Puncture needle is the medical device being commonly used, and is widely used in haemodialysis, intravenous drip etc. and is treating In the process.The puncture needle being widely adopted at present is draw point, and in piercing process, the draw point of hard is easy to damage blood vessel, from And cause the complication such as subcutaneous oozing of blood.In addition, when puncture needle is used for dialysis treatment, since dialysis procedure is longer, and entire In dialysis procedure, patient's arm is stiff, therefore comfort level is greatly affected.

Based on this, a kind of trochar being composed of casing and interior needle is used for puncture and dialysis procedure at present In.It when using this kind of trochar, needs first to be pierced into interior needle in patient vessel together together with casing, then loses the extraction of interior needle It abandons.But in use, when extracting interior needle from casing, sharp keen needle point can be exposed, to be easy to cause medical care people The damage of member and patient.In addition, the blood or body fluid that are carried on interior needle may also pollute environment and bring infection risk.

Utility model content

One of the purpose of this utility model is to provide a kind of puncture needle protection device, which can be right Puncture needle carries out effective protection, prevents sharp syringe needle from causing to damage to medical staff or patient.

Based on above-mentioned purpose, the utility model provides a kind of puncture needle protection device comprising：

Sleeve, both ends in the axial direction are respectively equipped with first port and second port；The sleeve inner has The second channel of radial direction setting along the first passage of the perforation of its axial direction setting, and along sleeve, described first Channel is for housing puncture needle；

Pin is set in the second channel, and the pin is interior with being oppositely arranged in its axial direction End and outer end；

Elastic membrane is set to the cartridge exterior, and is covered on the outside of the outer end of the pin, to apply to pin Thrust；

Wherein, when the pin is located at the first station, the outer end of pin is stretched out from second channel and is located at sleeve Outside；When the puncture needle in first passage bounces back to pin position below, the elastic membrane is along second channel by backstop Pin is pushed into second station towards the direction in sleeve, and the pin blocks in second station or partial blockage first passage, To prevent the puncture needle in first passage to be pierced by via the first port.

Further, the second channel is provided close to the position of first port.

Further, in puncture needle protection device described in the utility model, step surface is equipped in the second channel, The inner end of the step surface and pin abuts, pin is limited in the second station.

In this embodiment, pin can be limited in second station by the setting of step surface, to prevent pin Further inwardly pushed away.

Further, puncture needle protection device described in the utility model, further includes stop part, close to the second end Mouth is set in first passage, to prevent the puncture needle in first passage from deviating from via the second port.

Further, in puncture needle protection device described in the utility model, the elastic membrane can be rubber membrane or Other elastic membranes that pellosil or polyurethane film or those skilled in that art know.

The another object of the utility model is to provide a kind of trochar, and the trochar is anti-with puncture needle described above Protection unit, to improve the safety of trochar in use.

Based on above-mentioned purpose, the utility model additionally provides a kind of trochar comprising：

Puncture needle component comprising hollow puncture needle, the puncture needle have tail end and head end in its axial direction；

Sheath assembly comprising sleeve body, described sleeve pipe ontology have proximally and distally in its axial direction；And

Puncture needle protection device as described above is set between the puncture needle component and sheath assembly；

Wherein, the puncture needle is inserted in across the puncture needle protection device in described sleeve pipe ontology.

In the technical scheme, sleeve body can be made of materials such as FEP, PTU.The internal diameter of sleeve body can be by It is thick to arrive thin various models, but should be adapted to simultaneously with the outer diameter of corresponding puncture needle.

Further, in trochar described in the utility model, the puncture needle component further includes：

Needle stand, one end are connect with the tail end of the puncture needle, are equipped in the needle stand and are connected with the hollow puncture needle Logical needle stand channel；

Venting plug is connect with the other end of the needle stand.

In the technical scheme, puncture needle is preferably the draw point of hard.The model of puncture needle can be from thick to thin each Kind model, such as 15G-24G, consequently facilitating medical staff or patient select according to actual needs.Needle stand can be plastics Needle stand, but the size in needle stand channel should be matched with puncture needle, so that puncture needle can be firmly set in needle stand.It wears The tail end of pricker can be achieved a fixed connection with needle stand by bonding mode.It is of course also possible to use technology people in the art The member other modes that know realize the connection of puncture needle tail end and needle stand.

In the technical scheme, venting plug can be the plastic part of taper, inside have hollow pipeline, pipeline one end to open It puts, the other end is covered with fluid-tight PTFE films of breathing freely.Venting plug is set to the other end of needle stand.In certain embodiments In, this one end of needle stand can be equipped with the step being adapted to venting plug, it, can when venting plug stoppers the step of the needle stand other end Blood outflow is prevented to realize closed.

Further, in trochar described in the utility model, the needle stand also has outwardly directed alar part.

The alar part is set so that needle stand easily facilitates gripping, to improve the ease of use of trochar.

Further, when trochar described in the utility model includes stop part, the stop part be arranged to Include gasket less, the gasket has centre bore；Correspondingly, the head end of the puncture needle has a limiting section, the limiting section it is outer Enclose the internal diameter being dimensioned to more than the centre bore.

Since the Outside Dimensions of limiting section are more than the internal diameter of gasket hollow hole, limiting section will be blocked by centre bore as a result, So that puncture needle can not be deviate from from the second port of sleeve.

Further, the limiting section is in flat, and the width of the limiting section is more than the internal diameter of the centre bore.

Further, in trochar described in the utility model, described sleeve pipe ontology is on the side wall close to its distal end Offer at least one areole.

The diameter of at least one areole is less than the internal diameter of sleeve body.Areole is opened up in sleeve body to be carried The flow of high blood or other fluids disengaging sleeve body.In addition, areole additionally aids reduction since sleeve body is in blood vessel It is interior it is adherent caused by the harmful effect that reduces of blood or other fluid flows.

Further, the areole can be equipped with multiple, and multiple areole symmetrically is arranged or non-right Claim ground setting.

Further, in trochar described in the utility model, the distal end of described sleeve pipe ontology has wedge-shaped part, described The outer diameter of wedge-shaped part is towards distally tapering into.This structure can reduce the resistance that trochar is subject in piercing process.

Further, in a kind of embodiment of the utility model, described sleeve pipe component further includes：

The casing seat of inner hollow, the both ends of described sleeve pipe seat in the axial direction be separately arranged as the first open end and Second open end, described sleeve pipe seat also have the wall port opened up on side wall；Wherein, first open end and the set The proximal end of tube body connects, and second open end is equipped with the pin storage tank of indent, with the puncture needle protection device Pin adaptation connection；

Side pipe, one end are connect with the wall port.

In the technical scheme, casing seat is triplate line, wherein the first open end can pass through rivet with sleeve body Or the mode that glue bonds achieves a fixed connection, the second open end by the pin storage tank by with puncture needle protection device Pin adaptation connection, the wall port as third open end are connect with side pipe.Side pipe can be by PVC or other materials system At hose.

Further, in trochar described in the utility model, the other end of the side pipe is connected with connector.

Above-mentioned connector can be female Luer, can also be automatic anti-connector or other functional three-way connections of backflowing.

Further, in trochar described in the utility model, the side pipe is equipped with for cutting off flow path in side pipe Clamping element.

Above-mentioned clamping element can be non-return folder.Over the course for the treatment of, operating personnel can clutch non-return folder as needed, with Anti- Hemostatic Oral Liquid or patient body fluid backflow and overflow trochar.

Further, in trochar described in the utility model, described sleeve pipe component further includes anti-overflow plug, is set to set Position in tube socket between the second open end and wall port.

Above-mentioned anti-overflow plug can be made of soft materials such as butadiene-styrene rubber or silicon rubber, and overflow is prevented to both play Effect also enables puncture needle to pass through anti-overflow plug.

Further, the anti-overflow plug is in inclined-plane or parabola face, the inclined-plane or parabolic close to one end of wall port Line face is tangentially arranged with the side pipe；And/or the other end of the anti-overflow plug close to the second open end is equipped with counterbore.

In the above-mentioned technical solutions, counterbore is set beyond the Great Wall anti-overflow, it can be in order to the positioning and assembly of anti-overflow plug.In addition, Anti-overflow plug is arranged to be in inclined-plane or parabola face close to one end of wall port, and tangent with side pipe, is blood in order to prevent It is deposited in the position in sleeve body, to prevent blood coagulation phenomenon.

Further, in another embodiment of the utility model, described sleeve pipe component further includes：

The casing seat of inner hollow, one end are connect with the proximal end of described sleeve pipe ontology；

Connection flexible pipe, one end are connect with the other end of described sleeve pipe seat；

The back seat of inner hollow is connect with the other end of the connection flexible pipe, and the end of the back seat is equipped with indent Pin storage tank, to be adapted to connection with the pin for puncturing needle protection device.

In the technical scheme, sleeve body can be fixedly connected by way of riveting or bonding with casing seat, set It is connected by connection flexible pipe between tube socket and back seat, the effect of connection flexible pipe is：On the one hand to connector sleeve tube socket and back seat； On the other hand, the setting of connection flexible pipe closes connection it is also possible that the tool holders such as haemostatic clamp may be used in medical staff when needed The flow path of hose.

Further, the connection flexible pipe is blood compatibility hose.When blood vessel is connected on back seat, blood phase The use of capacitive hose can reduce the influence to being embedded to the sleeve body in blood vessel.

Further, the connection flexible pipe is equipped with the clamping element for cutting off flow path in connection flexible pipe.The clamping element Can be haemostatic clamp as previously described or other tools.

It should be noted that each technical characteristic preferably, further, further described herein, not In the case of conflicting or conflict occurs, can mutually it be freely combined to form a variety of different technical solutions.

Puncture needle protection device described in the utility model, compact structure is compact, and component is simplified, and process and assemble is convenient, The protective action to puncture needle can be effectively realized, to avoid the damage to medical staff or patient.

Trochar described in the utility model when in use, when complete puncture puncture needle extracted from sleeve body When, puncture needle can be blocked in the casing for puncturing needle protection device, to prevent that needle point from piercing out again and to medical staff or Patient causes to damage.

Puncture needle protection device and trochar described in the utility model can be used for intravenous drip, blood transfusion and haemodialysis It is easy-to-use etc. a variety of therapeutic process, there is very strong applicability.

Description of the drawings

Fig. 1 shows the dimensional structure diagram described in the utility model for puncturing needle protection device.

Fig. 2 shows the cross-sectional view shown in FIG. 1 for puncturing needle protection device.

Fig. 3 shows Fig. 1 and the state shown in Fig. 2 for puncturing needle protection device under the first station.

Fig. 4 shows Fig. 1 and the state shown in Fig. 2 for puncturing needle protection device under second station.

Fig. 5 shows a kind of structural schematic diagram of the trochar described in the utility model under embodiment.

Fig. 6 shows the separate structure schematic diagram of trochar shown in fig. 5.

Fig. 7 shows a kind of structural representation of sheath assembly of the trochar described in the utility model under embodiment Figure.

Fig. 8 shows structural schematic diagram of the trochar described in the utility model under another embodiment.

Fig. 9 shows the separate structure schematic diagram of trochar shown in Fig. 8.

Figure 10 shows that the structure of sheath assembly of the trochar described in the utility model under another embodiment is shown It is intended to.

Specific implementation mode

Come to puncture needle protection device described in the utility model below in conjunction with Figure of description and specific embodiment It is further described in detail with trochar, but the detailed description does not constitute limitations of the present invention.

Fig. 1 shows the dimensional structure diagram described in the utility model for puncturing needle protection device.

Fig. 2 shows the cross-sectional view shown in FIG. 1 for puncturing needle protection device.

As depicted in figs. 1 and 2, puncture needle protection device described in the utility model includes：Sleeve 1, in the axial direction On both ends be respectively equipped with first port and second port (upper port and lower port i.e. shown in Fig. 2), the inside tool of sleeve 1 There is a first passage P being arranged along its axial direction, and along second intersected with first passage that is arranged of radial direction of sleeve Channel Q.Pin 2 is set in second channel Q, and it is inner end 21 that pin 2, which is located at one end in sleeve 1, is located at other than sleeve 1 One end is outer end 22.The elastic membrane 3 of rubber is set to the outside of sleeve 1, it can be seen from the figure that elastic membrane 3 could be provided as edge The circumferential direction for sleeve is wrapped in the periphery of sleeve outer wall, and is covered on the outer end 22 of pin 2, and elastic membrane 3 is Elastic membrane through being deformed, therefore it can be continuously applied thrust to pin 2.

In addition, it can also be seen that the rearward diameter of second channel Q becomes smaller compared with front, so as to form platform from Fig. 2 Terrace W is abutted for the inner end 21 with pin 2, when the inner end of pin 2 21 is resisted against on step surface W, pin 2 will be unable to further inwardly be promoted.

Preferably, puncture needle protection device described in the utility model can also include gasket 4, and gasket 4 is close to sleeve 1 Second port and in the first passage P.Gasket 4 is equipped with centre bore, to prevent the puncture needle in first passage via the Two-port netwerk is deviate from.

Fig. 3 and Fig. 4 respectively illustrates Fig. 1 and puncture needle protection device shown in Fig. 2 under the first station and second station State.

As shown in figure 3, when trochar is in and stores or puncture state, the puncture needle N in trochar, which is passed completely through, to be worn Pricker protective device, that is to say, that in this state, puncture needle is through entire first passage P's.In this case, only Backing pin 2 is punctured needle N and is squeezed out to side, to protrude from the outer wall of sleeve.At this point, elastic membrane 3 is in deformation state, and continue Apply thrust to pin 2.

As shown in figure 4, when removing needle, puncture needle is extracted from sleeve body, when the needle point of puncture needle N returns to backstop When the lower section of pin 2, the homing under the thrust of elastic membrane 3 of pin 2, thus block first passage P, therefore puncture needle N will be unable to go out from the first opening terminal spine again.When puncturing needle protection device equipped with gasket 4, since gasket 4 can block puncture needle Limiting section on N, so that puncture needle N can not be skidded off by the second open end of 1 lower section of sleeve.As such, puncture needle is being removed Go out after sleeve body, needle point is punctured needle protection device covering completely, avoids medical staff and patient is damaged.

Fig. 5 shows a kind of structural schematic diagram of the trochar described in the utility model under embodiment.

Fig. 6 shows the separate structure schematic diagram of trochar shown in fig. 5.

As shown in Figure 5 and Figure 6, in this embodiment, trochar described in the utility model includes：Puncture needle component 5, Sheath assembly 71, and the puncture needle protection device 6 between puncture needle component 5 and sheath assembly 71.It is storing and is puncturing Under state, the puncture needle in puncture needle component 5 passes through the sleeve body for puncturing needle protection device 6 and being inserted in sheath assembly 71 It is interior.

In the present embodiment, puncturing needle protection device 6 has structure as described above.

In the present embodiment, puncture needle component 5 includes：Hollow puncture needle 51, needle stand 52 made of plastics and row Vent plug 53.Wherein, the model of puncture needle 51 can be various models from thick to thin, such as 15G-24G, consequently facilitating medical care Personnel or patient select according to actual needs.The tail end of puncture needle is Nian Jie with one end of needle stand 52, needle stand 52 it is another End is connect with venting plug 53.The needle stand channel being connected to hollow puncture needle 51 is equipped in needle stand 52.The size in needle stand channel It is matched with the outer diameter of puncture needle 51, so that puncture needle 51 can be firmly set in needle stand 52.In addition, from Fig. 5 and Fig. 6 can also be seen that needle stand 52 also has outwardly directed alar part 521, this makes puncture needle component more easily hold, to Improve its ease of use.In the present embodiment, venting plug 53 can be the plastic part of taper, inside there is hollow pipeline, Pipeline one end open, the other end are covered with fluid-tight PTFE films of breathing freely.In some embodiments, needle stand 52 and exhaust One end of 53 connection of plug can be equipped with the step that is adapted to venting plug 53, can be with when venting plug stoppers the step in needle stand 52 Realize it is closed, to prevent blood outflow.

In addition, in certain embodiments, the head end of puncture needle can have limiting section, such as a flat limit Portion, the Outside Dimensions of the limiting section are set to larger than the internal diameter of the centre bore of gasket 4 shown in Fig. 2.For example, flat limit The width in position portion is more than the internal diameter of the centre bore of gasket 4.As such, limiting section will be blocked by centre bore, so that puncturing steel Needle can not be deviate from from the second port of sleeve.

Fig. 7 shows further a kind of structure of sheath assembly of the trochar described in the utility model under embodiment Schematic diagram.

As shown in fig. 7, in this embodiment, sheath assembly 71 is in Y types, so that itself and puncture needle component and puncture needle Protective device may be constructed a kind of Y molded cannula needles as shown in Figure 5 and Figure 6.It can be seen from figure 7 that sheath assembly 71 includes： The casing seat 711 of inner hollow, there are three ports for the casing seat 711 tool, wherein both ends in the axial direction are set respectively For the first open end and the second open end, in addition, being further opened with wall port 716 on the side wall of casing seat 711.Wherein, first Open end is fixedly connected with sleeve body 712 by way of be bonded or rivet, and the pin that the second open end is equipped with indent holds Slot 714 is set, for being adapted to connection with the pin for puncturing needle protection device, wall port 716 and set as third open end The straight portion of tube socket is in an angle, and is connect with side pipe 715.Side pipe 715 can be soft made of PVC or other materials Pipe.

In the present embodiment, sleeve body 712 can be made of materials such as FEP, PTU.The internal diameter of sleeve body 712 can be with It is various models from thick to thin, but needs to be adapted to the outer diameter of corresponding puncture needle.

In addition, from Fig. 7 it can also be seen that sleeve body 712 close to its distal end side wall on be further opened with areole H.The diameter of areole H is less than the internal diameter of sleeve body 712.Opened up in sleeve body 712 areole H can improve blood or Other fluids pass in and out the flow of sleeve body 712.It is reduced due to sleeve body 712 in the blood vessels in addition, areole H is additionally aided The harmful effect that blood caused by adherent or other fluid flows reduce.Areole H can be equipped with it is multiple, multiple areole can Symmetrically to be arranged, mutually can also asymmetricly be arranged.

In addition, it can also be seen that the distal end of sleeve body 712 has a wedge-shaped part from Fig. 7, the outer diameter of wedge-shaped part is towards set The distal end of tube body 712 tapers into.This structure can reduce the resistance that trochar is subject in piercing process.

Please continue to refer to Fig. 7, in the present embodiment, sheath assembly 71 further includes anti-overflow plug 713, is set to casing seat In 711, and set on the position between the second open end and wall port 716.Anti-overflow plug 713 can be by butadiene-styrene rubber or silicon The soft materials such as rubber are made, and to both play the role of preventing overflow, puncture needle are also enable to pass through anti-overflow plug.

Preferably, in certain embodiments, anti-overflow plug 713 is in inclined-plane or parabolic close to one end end face of wall port 716 Line face, the inclined-plane or parabola face are tangentially arranged with side pipe 715.In addition, the other end of the anti-overflow plug 713 close to the second open end End face can be equipped with counterbore, in order to the positioning and assembly of anti-overflow plug.

Please continue to refer to Fig. 5 and Fig. 6, and Fig. 7 is combined if necessary, the tail end of side pipe 715 is connected with connector 8.The connector 8 It can be female Luer, can also be automatic anti-connector or other functional three-way connections of backflowing.Further, it is also possible to find out, Side pipe 715 is equipped with the clamping element 9 for cutting off flow path in side pipe.The clamping element 9 can be non-return folder.It was treating as a result, Cheng Zhong, operating personnel can clutch non-return folder, backflow to prevent Hemostatic Oral Liquid or patient body fluid and overflow trochar as needed.

Fig. 1-Fig. 7 is please referred to, when in use, puncture needle 51 is together with 712 quilt of sleeve body first for above-mentioned trochar It is pierced into patient's body, in this case, the puncture needle 51 (namely puncture needle N) in trochar passes completely through puncture needle protection dress It sets 6 and is in sleeve body 712, and the pin 2 for puncturing needle protection device is adaptedly placed in stopping for 711 end of casing seat In backing pin storage tank 714, linked together with sheath assembly 71 without being disengaged from each other so that puncturing needle protection device 6. Simultaneously in this case, pin 2 is punctured draw point 51 and is squeezed out to side, to protrude from the outer wall of sleeve 1.At this point, elastic Film 3 is in deformation state, and continues to apply thrust to pin 2.When needing to remove needle, puncture needle 51 is by from sleeve body Extracted in 712, the needle point of puncture needle 51 returns to the lower section of pin 2, pin 2 elastic membrane 3 thrust next time Position is restored, to block first passage P, therefore puncture needle 51 will be unable to go out from the first opening terminal spine of sleeve again.With this Simultaneously as pin 2 is pushed into sleeve 1, therefore pin 2 also can be from the pin storage tank of 711 end of casing seat Abjection in 714, to disconnect the connection for puncturing needle protection device 6 and sheath assembly 71.In addition, during removing needle, 4 meeting of gasket The limiting section on puncture needle 51 is blocked, so that puncture needle 51 can not be skidded off by the second open end of 1 lower section of sleeve.

Fig. 8 shows structural schematic diagram of the trochar described in the utility model under another embodiment.

Fig. 9 shows the separate structure schematic diagram of trochar shown in Fig. 8.

As shown in Figure 8 and Figure 9, in this embodiment, trochar described in the utility model includes：Puncture needle component 5, Sheath assembly 72, and the puncture needle protection device 6 between puncture needle component 5 and sheath assembly 72.It is storing and is puncturing Under state, the puncture needle in puncture needle component 5 passes through the sleeve body for puncturing needle protection device 6 and being inserted in sheath assembly 72 It is interior.

The trochar in the embodiment, which is can be seen that, from Fig. 8 and Fig. 9 is different from Fig. 5 and Y molded cannulas needle shown in fig. 6, It is a kind of straight molded cannula needle.

In the present embodiment, puncturing needle protection device 6 has structure as described above.

In addition, in the present embodiment, puncture needle component 5 also includes：Hollow puncture needle 51, needle stand 54 made of plastics And venting plug 53.Wherein, the model of puncture needle 51 can be various models from thick to thin, such as 15G-24G, to just It is selected according to actual needs in medical staff or patient.The tail end of puncture needle is Nian Jie with one end of needle stand 54, needle stand 54 The other end connect with venting plug 53.The needle stand channel being connected to hollow puncture needle 51 is equipped in needle stand 54.Needle stand channel Size matched with the outer diameter of puncture needle 51 so that puncture needle 51 can firmly be set to needle stand 54 in.In this reality It applies in example, venting plug 53 can be the plastic part of taper, inside have hollow pipeline, pipeline one end open, the other end to be covered with Ventilative fluid-tight PTFE films.In some embodiments, one end that needle stand 54 is connect with venting plug 53 can be equipped with The step that venting plug 53 is adapted to may be implemented closed so that when venting plug stoppers the step in needle stand 54, and then prevent Blood outflow.

In addition, in certain embodiments, the head end of puncture needle 51 can have limiting section, such as a flat limit Portion, the Outside Dimensions of the limiting section are more than the internal diameter of the centre bore of gasket 4 shown in Fig. 2.For example, the width of flat limiting section Internal diameter of the degree more than the centre bore of gasket 4.As such, limiting section will be blocked by centre bore, so that puncture needle 51 can not Deviate from from the second port of sleeve.

Figure 10 shows further sheath assembly of the trochar described in the utility model under another embodiment Structural schematic diagram.

As shown in Figure 10, in this embodiment, sheath assembly 72 is in flat type.It can be seen from fig. 10 that sheath assembly 72 include：The casing seat 721 of inner hollow, one end are fixedly connected with sleeve body 722 by way of be bonded or rivet, The other end is connect with one end of connection flexible pipe 723；The back seat 724 of inner hollow is connect with the other end of connection flexible pipe 723, back seat 724 end is equipped with the pin storage tank 725 of indent, for being adapted to connection with the pin for puncturing needle protection device.Wherein, Connection flexible pipe is preferably blood compatibility hose.

In addition, in other embodiments, being also provided in connection flexible pipe 723 for cutting off flow path in connection flexible pipe Clamping element, such as haemostatic clamp or other tools.

In the present embodiment, sleeve body 722 can be made of materials such as FEP, PTU.The internal diameter of sleeve body 722 can be with It is various models from thick to thin, but needs to be adapted with the outer diameter of corresponding puncture needle.

In addition, from Figure 10 it can also be seen that sleeve body 722 close to its distal end side wall on be further opened with areole H.The diameter of areole H is less than the internal diameter of sleeve body 722.Opened up in sleeve body 722 areole H can improve blood or Other fluids pass in and out the flow of sleeve body 722.It is reduced due to sleeve body 722 in the blood vessels in addition, areole H is additionally aided The harmful effect that blood caused by adherent or other fluid flows reduce.Areole H can be equipped with it is multiple, multiple areole can Symmetrically to be arranged, mutually can also asymmetricly be arranged.

In addition, it can also be seen that the distal end of sleeve body 722 has wedge-shaped part, the outer diameter court of the wedge-shaped part from Figure 10 The distal end for sleeve body 722 tapers into.This structure can reduce the resistance that trochar is subject in piercing process.

Please refer to Fig. 1-Fig. 4 and Fig. 8-Figure 10, above-mentioned trochar when in use, first puncture needle 51 together with Sleeve body 722 is pierced patient's body, and in this case, the puncture needle 51 (namely puncture needle N) in trochar is worn completely Cross puncture needle protection device 6 and in sleeve body 722, and after the pin 2 for puncturing needle protection device is adaptedly placed in In the pin storage tank 725 of 724 ends of seat so that puncture needle protection device 6 and sheath assembly 72 link together and It will not be disengaged from each other.Simultaneously in this case, pin 2 is punctured draw point 51 and is squeezed out to side, to protrude from the outer of sleeve 1 Wall.At this point, elastic membrane 3 is in deformation state, and continue to apply thrust to pin 2.When needing to remove needle, 51 quilt of puncture needle It is extracted from sleeve body 722, the needle point of puncture needle 51 returns to the lower section of pin 2,2 pushing away in elastic membrane 3 of pin Homing under force effect, to block first passage P, therefore puncture needle 51 will be unable to the first opening from sleeve 1 again Terminal spine goes out.At the same time, since pin 2 is pushed into sleeve 1, pin 2 also can be from the backstop of 724 end of back seat Abjection in storage tank 725 is sold, to disconnect the connection for puncturing needle protection device 6 and sheath assembly 72.In addition, removing needle process In, gasket 4 can block the limiting section on puncture needle 51, so that puncture needle 51 can not pass through the second of 1 lower section of sleeve Open end skids off.

The claimed technical solution of the utility model is not limited to above-mentioned each specific implementation mode.In addition, being retouched above Each technical characteristic stated can also be combined with each other in the case where conflicting or conflict does not occur.Those skilled in the art If all deformations for directly exporting or associating from content disclosed by the utility model, should all belong to the protection of the utility model Range.

Claims (15)

1. a kind of puncture needle protection device, which is characterized in that including：

Sleeve, both ends in the axial direction are respectively equipped with first port and second port；The sleeve inner has along it Axial direction setting perforation first passage, and along sleeve radial direction be arranged second channel, the first passage For housing puncture needle；

Pin is set in the second channel, the pin have in its axial direction the inner end that is oppositely arranged and Outer end；

Elastic membrane is set to the cartridge exterior, and is covered on the outside of the outer end of the pin, to be pushed away to pin application Power；

Wherein, when the pin is located at the first station, the outer end of pin is stretched out from second channel and is located at outside sleeve；When When puncture needle in first passage bounces back to pin position below, the elastic membrane along second channel by pin towards Direction in sleeve is pushed into second station, and the pin blocks in second station or partial blockage first passage, to prevent Puncture needle in first passage is pierced by via the first port.

2. puncturing needle protection device as described in claim 1, which is characterized in that be equipped with step surface, institute in the second channel The inner end for stating step surface and pin abuts, pin is limited in the second station.

3. puncturing needle protection device as described in claim 1, which is characterized in that further include stop part, close to described second Port is set in first passage, to prevent the puncture needle in first passage from deviating from via the second port.

4. puncturing needle protection device as described in claim 1, which is characterized in that the elastic membrane be rubber membrane or pellosil or Polyurethane film.

5. a kind of trochar, which is characterized in that including：

Puncture needle component comprising hollow puncture needle, the puncture needle have tail end and head end in its axial direction；

Sheath assembly comprising sleeve body, described sleeve pipe ontology have proximally and distally in its axial direction；

Puncture needle protection device as described in any one of claim 1-4 is set to the puncture needle component and casing group Between part；

Wherein, the puncture needle is inserted in across the puncture needle protection device in described sleeve pipe ontology.

6. trochar as claimed in claim 5, which is characterized in that the puncture needle component further includes：

Needle stand, one end are connect with the tail end of the puncture needle, are equipped in the needle stand and to be connected to the hollow puncture needle Needle stand channel；

Venting plug is connect with the other end of the needle stand.

7. trochar as claimed in claim 6, which is characterized in that the needle stand also has outwardly directed alar part.

8. trochar as claimed in claim 5, which is characterized in that when described sleeve pipe needle includes stop part, the stop part It is arranged to include at least gasket, the gasket has centre bore；The head end of the puncture needle has limiting section, the limiting section Outside Dimensions are set to larger than the internal diameter of the centre bore.

9. trochar as claimed in claim 8, which is characterized in that the limiting section is in flat, the width of the limiting section More than the internal diameter of the centre bore.

10. trochar as claimed in claim 5, which is characterized in that wherein sleeve body is opened on the side wall close to its distal end Equipped at least one areole, when the areole is equipped with it is multiple when, multiple areole symmetrically is arranged or non-right Claim ground setting.

11. trochar as claimed in claim 5, which is characterized in that the distal end of described sleeve pipe ontology has wedge-shaped part, the wedge The outer diameter in shape portion is towards distally tapering into.

12. the trochar as described in any one of claim 5-11, which is characterized in that described sleeve pipe component further includes：

The casing seat of inner hollow, the both ends of described sleeve pipe seat in the axial direction are separately arranged as the first open end and second Open end, described sleeve pipe seat also have the wall port opened up on side wall；Wherein, first open end and described sleeve pipe sheet The proximal end of body connects, and second open end is equipped with the pin storage tank of indent, to puncture stopping for needle protection device with described Backing pin adaptation connection；

Side pipe, one end are connect with the wall port.

13. trochar as claimed in claim 12, which is characterized in that described sleeve pipe component further includes anti-overflow plug, is set to institute State the position between the second open end and wall port in casing seat.

14. trochar as claimed in claim 13, which is characterized in that the anti-overflow plug is in inclined-plane close to one end of wall port Or parabola face, the inclined-plane or parabola face are tangentially arranged with the side pipe；And/or the anti-overflow plug is opened close to second The other end at mouth end is equipped with counterbore.

15. the trochar as described in any one of claim 5-11, which is characterized in that described sleeve pipe component further includes：

The casing seat of inner hollow, one end are connect with the proximal end of described sleeve pipe ontology；

Connection flexible pipe, one end are connect with the other end of described sleeve pipe seat；

The back seat of inner hollow is connect with the other end of the connection flexible pipe, and the end of the back seat is equipped with the backstop of indent Storage tank is sold, to be adapted to connection with the pin for puncturing needle protection device.