CN208582446U - Medical outer sheath and catheter sheath with the medical outer sheath - Google Patents

Abstract

The utility model provides a kind of medical outer sheath, the medical outer sheath is in hollow tubular, its internal formation transfer passage, the medical outer sheath is equipped with seal assembly, the seal assembly includes seal, the seal is connected to the one end of the medical outer sheath and controls the on-off of the transfer passage, the seal is the elastomer with axial cavity, elastic deformation state when the seal has original state and squeezed by external force, in the initial state, at least part of the seal cavity is closed, completely cut off the connection of the cavity Yu the medical outer sheath internal transport channel；When the cavity of the seal is squeezed by external force, elastic deformation occurs for the seal, and the cavity of the seal is connected to the transfer passage in the medical outer sheath.The utility model also provides a kind of catheter sheath.The catheter sheath enters external treatment object in human vas with lesser driving force, not only easy to operate, but also sealing performance is excellent.

Description

Medical outer sheath and catheter sheath with the medical outer sheath

Technical field

The utility model relates to the field of medical instrument technology more particularly to a kind of for the medical outer of insertion type treatment operation Sheath and catheter sheath with the medical outer sheath.

Background technique

With the extensive use of Endovascular interventional treatment worldwide, percutaneously or obtained greatly through microcatheter technology Development.Catheter sheath is for establishing channel for the transportation system (delivery conduit) to intervention apparatus in percutaneous or Minimally Invasive Surgery.With It is quiet through femoral artery or stock due in the course of surgery, needing for intervening aortic valve and cusps of pulmonary valve replacement operation Arteries and veins punctures, and the delivery sheath of valve is then mounted with through femoral artery or femoral vein conveying, is needed at this time in cavity of resorption openings in blood vessels Place is first placed in a catheter sheath, to protect cavity of resorption blood vessel.Thus the tail end of catheter sheath usually contains sealing device, to prevent in blood vessel Blood flow outflow.

Catheter sheath when in use, needs to have two performances, first is that, to have good passability, so that conduit etc. Instrument can conveniently pass through, second is that, to have good sealing performance.

Catheter sheath in the prior art, is often able to satisfy in sealing performance, but on passability, then exists and owe It lacks, when in use, often requiring to use could allow expander to move ahead or withdraw more energetically.

Utility model content

In view of this, it is necessary to provide a kind of improved medical outer sheath, catheter sheath and insertion types to treat delivery instrument, Easy to operate, sealing performance is excellent.

The utility model provides a kind of medical outer sheath, and the medical outer sheath is in hollow tubular, internal to form conveying Channel, the medical outer sheath are equipped with seal assembly, and the seal assembly includes seal, and the seal is connected to described The one end of medical outer sheath and the on-off for controlling the transfer passage, the seal are the elastomer with axial cavity, Elastic deformation state when the seal has original state and squeezed by external force, in the initial state, the sealing body cavity At least part of body is closed, and the connection of the cavity Yu the medical outer sheath internal transport channel is completely cut off；In the sealing When the cavity of body is squeezed by external force, elastic deformation, the cavity of the seal and the medical outer sheath occur for the seal Internal transfer passage connection.

Further, the seal is cylinder, and the seal includes the first head, the second head and is set to described Waist between first head and second head, in the initial state, waist inner surface heart axis direction thereto Indent is to close the cavity and completely cut off the connection of the cavity Yu the medical outer sheath.

Further, the two sides of the relatively described waist of the centre portion of the waist of the seal are closer to the waist The central axial direction in portion.

Further, extend along the direction of both ends of the centre portion of the waist of the seal toward the waist, The seal has tapered wall thickness.

Further, the internal diameter on first head and second head is greater than the internal diameter of the waist.

Further, the material of the seal be one of silica gel, rubber, flexible PVC or more than one.

Further, the seal assembly further includes sealing element, and the sealing element is fixedly installed on the seal and institute It states between medical outer sheath, the sealing element seals the transfer passage of the medical outer sheath building, so that the sealing It is tightly connected between body and the medical outer sheath.

Further, it is additionally provided with gas deflation assembly in the medical outer sheath, the gas deflation assembly is set to the sealing Between component and the medical outer sheath, one end of the gas deflation assembly is fixedly connected with the medical outer sheath, the other end with The seal assembly is fixedly connected.

Further, the gas deflation assembly includes attachment base and the connecting tube that is set on the attachment base, the connection Seat is respectively fixedly connected with the medical outer sheath, the connecting tube and the seal assembly, the connecting tube, the attachment base and Cavity in the seal assembly is mutually communicated with the transfer passage in the medical outer sheath, is provided with valve in the connecting tube Door, the valve control the on-off of the connecting tube, and the valve is opened when the medical outer sheath is vented.

Further, the seal assembly further includes the first sealing knob and the second sealing knob, first sealing rotary Button and the second sealing knob are fixedly installed on the both ends of the seal respectively, and the first sealing knob is fixedly connected with institute Seal and the attachment base are stated, the first sealing knob is arranged the sealing element and is fixedly connected with the attachment base.

The utility model also provides a kind of catheter sheath, and the catheter sheath includes expansion pipe and such as claim 1-10 any Described in medical outer sheath, the expansion pipe be arranged in the medical outer sheath and the seal assembly and from it is described it is medical outside The both ends of sheath are stretched out.

Further, grip part is additionally provided on the expansion pipe, the grip part is set to the expansion and manages close to institute State one end of seal assembly.

Further, development mark is additionally provided on the expansion pipe, the development mark is described medical outer for showing Relative position between sheath and the expansion pipe.

Further, through-hole is offered along center axis thereof direction on the expansion pipe.

The catheter sheath provided by the utility model enables external treatment object to enter human body blood with lesser driving force Guan Zhong, it is not only easy to operate, and also sealing performance is excellent.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the catheter sheath in one embodiment of the utility model.

Fig. 2 is the structural schematic diagram at another visual angle of catheter sheath shown in Fig. 1.

Fig. 3 is the schematic cross-sectional view of catheter sheath shown in Fig. 1.

Fig. 4 is the dismantling schematic diagram of catheter sheath shown in Fig. 1.

Fig. 5 is that seal assembly shown in Fig. 1 is squeezed schematic cross-sectional view when elastic deformation occurs.

Fig. 6 is the schematic cross-sectional view under seal assembly original state shown in Fig. 5.

Main element symbol description

The following detailed description will be further explained with reference to the above drawings the utility model.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

It should be noted that it can be installed directly in another group when component is referred to as " being installed in " another component On part or there may also be components placed in the middle.When a component is considered as " being set to " another component, it be can be directly It connects and is arranged on another component or may be simultaneously present component placed in the middle.When a component be considered as " being fixed on " another Component, it, which can be, is directly anchored on another component or may be simultaneously present component placed in the middle.

Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " include Any and all combinations of one or more related listed items.

Also referring to Fig. 1 to Fig. 4, Fig. 1 is the structural representation of the catheter sheath 100 in one embodiment of the utility model Figure, Fig. 2 are the structural schematic diagram at another visual angle of catheter sheath 100 shown in Fig. 1, and Fig. 3 is the section view signal of catheter sheath 100 shown in Fig. 1 Figure, Fig. 4 are the dismantling schematic diagram of catheter sheath 100 shown in Fig. 1.Catheter sheath 100 is for expanding human vas and in human vas Transfer passage is constructed, the external treatments such as the intervention apparatus such as human vas bracket or drug object enters human body blood by the transfer passage In pipe and the predetermined positions such as lesion are transported to, the insertion type of human body is treated to realize, the transportation system of external treatment object is logical The transfer passage for crossing the building of catheter sheath 100 enters in human vas, can be direct to avoid the transportation system tube wall of external treatment object It is directly contacted with human vas, reduces the frictionally damage to human vas, to protect people on the basis of meeting treatment and requiring Body blood vessel.

Catheter sheath 100 includes expanding pipe 10, medical outer sheath 20 and the seal assembly 30 being set in medical outer sheath 20, Medical outer sheath 20 is sheathed on expansion pipe 10, and expansion pipe 10 is arranged in medical outer sheath 20 and from the both ends of medical outer sheath 20 It stretches out, expansion 10 one end of pipe has grip part, and the other end has cone cell tip, facilitates expansion pipe in medical outer sheath 20 and people Moving ahead in body blood vessel, one end of medical outer sheath 20 is protruded into human vas, and it is outer and exposed in human body that the other end is located at blood vessel Outside, for medical outer sheath 20 for constructing transfer passage, seal assembly 30 is set to one end of medical outer sheath 20, uses In sealing transfer passage and control the on-off of transfer passage.

When progress insertion type treatment needs to place catheter sheath 100, first punctured at human vas using puncture needle, Then delivery guidewire establishes silk guide passage to blood vessel on puncture needle, and later, expansion pipe 10 is inserted into medical outer sheath 20, By the inner cavity of the other end of seal wire insertion expansion pipe 10, along seal wire by medical outer sheath 20 and expander 10 as a whole It is slowly advanced in blood vessel, so that one end of medical outer sheath 20 stays in intravascular, the other end is exposed outside blood vessel, at this point, sealing Component 30 controls the on-off of the transfer passage and prevents blood outflow external.When medical outer sheath 20 pushes to suitable position, Continue the delivery guidewire in the inner cavity of expansion pipe 10 to withdraw expansion pipe 10 again later to affected area, establish in medical outer sheath 20 Channel in, along seal wire convey intervention apparatus conveying system.

Certainly according to the difference of operation, silk guide passage can not also be pre-established, but directly promotes catheter sheath after piercing 100。

The utility model relates to catheter sheath can be used for intervening operation when, for intervention operation transportation system establish channel, Such as delivery of vascular bracket, heart valve prosthesis, in other embodiments, catheter sheath 100 can also be applied to other diseases Insertion type treatment in, such as conveying sacculus or drug be to affected area, as long as the conveying for needing to construct between extra vascular is logical The use occasion in road can apply catheter sheath 100 provided by the utility model.

The tapered one end of expansion pipe 10 is moved ahead with relatively small area in human vas outer wall and slowly guidance expansion Pipe 10 protrudes into intravascular, and expansion pipe 10 can gradually extend blood vessel, reduce the damage to blood vessel.

Development mark 11 is fixedly installed on expansion pipe 10, development mark 11 is used to indicate medical outer sheath 20 and expansion Rigging position relationship between pipe 10, the length of medical outer sheath 20 are less than the length of expansion pipe 10, medical outer sheath 20 and expansion The relative positional relationship for opening pipe 10 is realized by development mark 11 to be positioned, work of the development mark 11 in developing apparatuses such as ultrasonic devices With the lower relative position for showing medical outer sheath 20 on expansion pipe 10.When catheter sheath 100 protrudes into inside of human body, by outer Portion's developing apparatus can help healthcare givers to obtain the relative positional relationship of expansion pipe 10 and medical outer sheath 20, thus it is convenient with Safely expansion pipe 10 is exited out of medical outer sheath 20.In present embodiment, the development mark 11 is ring-type, edge The tube wall of the expansion pipe 10 is circumferentially arranged.

Expansion pipe 10 is also installed with grip part 12 away from the one end at the tip, and grip part 12 is fixedly installed on expansion pipe 10 On, grip part 12 is used to operate expansion pipe 10 for healthcare givers and exit from intravascular, thus convenient and stable split extension pipe 10.In present embodiment, the outer surface of grip part 12 has along the outwardly extending lobed protrusion of expansion 10 radial direction of pipe.It can To understand, the outer surface of grip part 12 is also provided with using other any appropriate forms and structure, for example, having certain Roughness is equipped with strip bulge, is equipped with curved shape protrusion, is equipped with array of depressions etc., as long as it can facilitate operator to stablize Split extension pipe 10.

It is appreciated that when stablizing separation, being held when healthcare givers is not necessarily to can be realized by grip part 12 to expansion pipe 10 Holding portion 12 can be omitted.

In present embodiment, the approximate center of expansion pipe 10 is also provided with through-hole 13 along its axial direction, i.e. expansion pipe 10 is Hollow pipe, expanding the through-hole 13 inside pipe 10 allows seal wire (not shown) to pass through.It is appreciated that can be realized pair without seal wire Under the use occasion of external treatment object traction, without through-hole 13 is opened up in expansion pipe 10, expanding pipe 10 at this time is solid tubes.

Medical outer sheath 20 is arranged expansion pipe 10, and the length of medical outer sheath 20 is less than the length of expansion pipe 10, setting It is protruded between one end of blood vessel and operation ring 12 in expansion pipe 10, expansion pipe 10 protrudes into intravascular and drives medical outer sheath 20 Protrude into intravascular, healthcare givers is exited from medical outer sheath 20 by operation ring 12 by pipe 10 is expanded at this time, so that medical outer One end of sheath 20 is protruded into intravascular, and the other end is located at except blood vessel, so that outer in the blood vessels construct transfer passage.External treatment Object is entered in human vas by transfer passage, is treated to realize to the insertion type of human body.

One end of medical outer sheath 20 is installed with gas deflation assembly 21, gas deflation assembly 21 be set to medical outer sheath 20 with it is close Between sealing assembly 30, gas deflation assembly 21 avoids gas from entering in human vas for excluding remaining gas in catheter sheath 100. Gas deflation assembly 21 includes attachment base 211, connecting tube 212 and the valve 213 being arranged in connecting tube 212, and attachment base 211 is hollow Cavity, be connected to medical outer sheath 20, seal assembly 30 and connecting tube 212, and realize medical outer sheath 20, sealing Interconnection between 212 three of component 30 and connecting tube.

One end of connecting tube 212 is connected to attachment base 211, and remaining gas passes through into connecting tube 212 in catheter sheath 100 It is discharged from inside to outside after saline injection from catheter sheath 100.In present embodiment, connecting tube 212 is rubber hose.It can manage Solution, in other embodiments, connecting tube 212 can also be metal bellow, plastic flexible pipe, plastic rigid pipe, metal hard tube Etc. other kinds of pipe fitting, as long as it can exclude remaining gas in catheter sheath 100.

Valve 213 is fixed on the one end of connecting tube 212 far from attachment base 211, is used to control connecting tube 212 On-off, valve 213 are being in normally off, are opening when connecting tube 212 is vented, close after exhaust.

One end that medical outer sheath 20 connects gas deflation assembly 21 is additionally provided with conductor housing 201, conductor housing 201 and medical epitheca The attachment base 211 that pipe 20 is integrally formed and is fixedly connected in gas deflation assembly 21, the outside of conductor housing 201 extends outwardly simultaneously Form protrusion 2011.The attachment base 211 is inserted into the end of the conductor housing 201, and described raised 2011 support attachment base 211 To realize the limit to 21 axial position of gas deflation assembly.Sealing element can also be set between conductor housing 201 and gas deflation assembly 21 (not shown), for further strengthening the sealing performance between medical outer sheath 20 and gas deflation assembly 21.

When operation is exhausted in catheter sheath 100, the valve 213 being fixed in connecting tube 212 is opened, connecting tube 212 The access to connect with transfer passage is formed, is slowly injected into physiological saline to the end of connecting tube 212, physiological saline gradually fills Catheter sheath 100, so that the remaining gas of catheter sheath 100 is discharged, to complete the exhaust process of catheter sheath 100.Gas deflation assembly 21 can be avoided in the residual gas injection human vas in catheter sheath 100, reduce the damage to human body.

It is appreciated that when without considering in damage or catheter sheath 100 of the residual gas to human body in catheter sheath 100 not When residual gas, gas deflation assembly 21 also be can be omitted, and seal assembly 30 is directly connected in the conduit in medical outer sheath 20 at this time First 201.

Seal assembly 30 is fixedly connected with gas deflation assembly 21 and is interconnected with the transfer passage of medical outer sheath 20 building, close Sealing assembly 30 avoids human body blood loss for preventing blood of human body from flowing outwardly out of medical outer sheath 20 by transfer passage.It is close Sealing assembly 30 includes that seal 31, first seals knob 32 and the second sealing knob 33, the first sealing knob 32 and the second sealing Knob 33 is respectively fixedly connected in the both ends of seal 31, corresponds to seal on the first sealing knob 32 and the second sealing knob 33 31 position opens up fluted 321, groove 322 respectively, and the first sealing knob 32 is chimeric with seal 31 solid by groove 321 Fixed, the second sealing knob 33 is fitted and fixed with by groove 322 with seal 31, to realize that seal 31, first seals knob 32 and second sealing 33 three of knob between being fixedly connected.

One end of first sealing knob 32 is fixedly connected with attachment base 211, and the other end is fitted and fixed with seal 31.Second Sealing knob 33 is fixedly installed on seal 31 away from one end of the first sealing knob 32, and seal assembly 30 is being returned for healthcare givers Fixed medical outer sheath 20 when expansion pipe 10 is removed, healthcare givers is medical by the fixation of seal assembly 30 when withdrawing expansion pipe 10 Outer sheath 20 and operate operation ring 14 by expand pipe 10 exited out of medical outer sheath 20.It is cured for the ease of healthcare givers is fixed With outer sheath 20, the first sealing knob 32 in seal assembly 30 is sealed with second offers non-slip texture on knob 33.

Please refer to fig. 5, Fig. 5 is that seal assembly 30 is squeezed schematic cross-sectional view when elastic deformation occurs, it is close Envelope body 31 is made of elastic material comprising the first head 311, the second sealing rotary of insertion in insertion the first sealing knob 32 The second head 312 in button 33 and the waist 313 being set between the first head 311 and the second head 312, waist 313 it is interior Portion forms the cavity 314 of connection transfer passage, and waist 313 is in normally off, the heart thereto under the elastic reaction of itself Axis direction indent is with closed cavity 314.When external treatment object needs to enter human vas by cavity 314 through its delivery conduit When middle, delivery conduit is resisted against on the waist 313 of indent, and operator acts on delivery conduit and continues to protrude into cavity 314 at this time, By external force extruding radial elastic deformation is occurred for seal 31, and 313 cavity volume of waist of seal 31 becomes larger, the waist of indent 313 become opening state from closed state, and stirrup is sealed on delivery conduit, to realize cavity 314 and transfer passage It is interconnected, the delivery conduit of external treatment object is entered in human vas by cavity 314 and transfer passage.

It is the schematic cross-sectional view under 30 original state of seal assembly shown in Fig. 5 referring again to Fig. 6, Fig. 6.In initial shape Under state, at least part of 31 cavity of seal closes (sealing), and isolation cavity 314 and medical 100 inside of outer sheath are defeated Send the connection in channel；The waist 313 of seal 31 can be realized as closing and opening to cavity 314 by the elasticity of itself, Since the direction of both ends along centre portion toward 31 waist 313 of seal of the waist 313 of the seal 31 extends, described The intracavitary internal diameter of seal 31 is non-equal gauge structures, and under best mode, 314 inner diameter or volume of cavity gradually expands from intermediate toward two sides Greatly, such as hourglass configuration is presented, or along the axis direction of seal 31, seal 31 has tapered from centre portion toward two sides Wall thickness so that operator only need very little driving force can smoothly in catheter sheath 20 convey expander or conveying outside The delivery conduit of therapeutant passes through in cavity 314 to human vas.

In present embodiment, seal 31 is made of low-density silica gel, and the inner surface of seal 31 is also coated with hydrophilic painting Layer, to improve the greasy property and anti-microbial property on 31 surface of seal.

In other embodiments, seal 31 can also be made of other materials such as rubber, flexible PVCs.

Sealed connection between seal assembly 30 and gas deflation assembly 21 be realize 100 insertion type of catheter sheath treatment basis and Key, the seal assembly 30 in catheter sheath 100 provided by the utility model further includes sealing element 34, and sealing element 34 is set to sealing Between body 31 and gas deflation assembly 21, sealing element 34 can reinforce the sealing performance between fixed part 34 and gas deflation assembly 21, it is ensured that The normal use of catheter sheath 100.When gas deflation assembly 21 omits, sealing element 34 is directly arranged at fixed part 34 and medical epitheca Between the conductor housing 201 of pipe 20.

In present embodiment, sealing element 34 is a sealing ring, is fixed between seal 31 and gas deflation assembly 21. In other embodiments, sealing element 34 can also be the other kinds of sealing elements such as airtight and watertight padding, as long as it being capable of reinforced platoon Sealing performance between pneumatic module 21 and seal assembly 30.

The use process of catheter sheath 100 is described below:

After 31 sealing duct sheath 100 of seal, operation is exhausted in catheter sheath 100, and catheter sheath 100 leads to after being vented It crosses expansion pipe 10 slowly to protrude into human vas, and it is intravascular to drive one end of medical outer sheath 20 to protrude into, the other end stays in blood Pipe is outer, to construct transfer passage, the seal wire being arranged in expansion pipe 10 is reserved in human vas, operation expansion pipe 10 On operation ring 12 exit medical outer sheath 20, thus realize expansion pipe 10 and medical outer sheath 20 between being separated from each other, lead to It crosses the seal wire traction external treatment object being reserved in human vas and reaches human vas and treatment position, after the completion of insertion type treatment Reserved seal wire is withdrawn from into human vas together with catheter sheath 100 together, to complete the use process of catheter sheath 100.

For ease of description, the catheter sheath 100 in present embodiment is used for for realizing the insertion type treatment to human body It protrudes into human vas.It is appreciated that catheter sheath 100 is not limited to be only applied in the insertion type treatment of human body, in other realities It applies in mode, catheter sheath 100 can also be applied in the insertion type treatment of animal body, and catheter sheath 100 protrudes into animal body blood at this time Guan Zhong.

Catheter sheath 100 provided by the utility model, external treatment object can be entered in human vas with lesser driving force, It is not only easy to operate, and sealing performance is excellent.

Those skilled in the art it should be appreciated that more than embodiment be intended merely to illustrate that this is practical new Type, and be not used as the restriction to the utility model, as long as implementing in the spirit of the utility model to above Suitably change and change made by mode and all falls in the range of the requires of the utility model protection.

Claims (14)

1. a kind of medical outer sheath, the medical outer sheath is in hollow tubular, internal to form transfer passage, which is characterized in that The medical outer sheath is equipped with seal assembly, and the seal assembly includes seal, and the seal is connected to described medical The one end of outer sheath and the on-off for controlling the transfer passage, the seal is the elastomer with axial cavity, described Elastic deformation state when seal has original state and squeezed by external force, in the initial state, the seal cavity At least part is closed, and the connection of the cavity Yu the medical outer sheath internal transport channel is completely cut off；In the seal When cavity is squeezed by external force, elastic deformation occurs for the seal, inside the cavity of the seal and the medical outer sheath The transfer passage connection.

2. medical outer sheath as described in claim 1, which is characterized in that the seal is cylinder, and the seal includes First head, the second head and the waist being set between first head and second head, in the initial state, institute State waist inner surface thereto heart axis direction indent to close the cavity and completely cut off the cavity and the medical outer sheath Connection.

3. medical outer sheath as claimed in claim 2, which is characterized in that the centre portion phase of the waist of the seal To the two sides of the waist closer to the central axial direction of the waist.

4. medical outer sheath as claimed in claim 2, which is characterized in that along the middle area of the waist of the seal The direction of both ends of section toward the waist extends, and the seal has tapered wall thickness.

5. medical outer sheath as claimed in claim 2, which is characterized in that the internal diameter on first head and second head Greater than the internal diameter of the waist.

6. medical outer sheath as described in claim 1, which is characterized in that the material of the seal is silica gel, rubber, soft One of PVC or more than one.

7. medical outer sheath as described in claim 1, which is characterized in that the seal assembly further includes sealing element, described close Sealing is fixedly installed between the seal and the medical outer sheath, the sealing element sealing medical outer sheath building The transfer passage so that being tightly connected between the seal and the medical outer sheath.

8. medical outer sheath as claimed in claim 7, which is characterized in that be additionally provided with exhaust group in the medical outer sheath Part, the gas deflation assembly are set between the seal assembly and the medical outer sheath, one end of the gas deflation assembly and institute It states medical outer sheath to be fixedly connected, the other end is fixedly connected with the seal assembly.

9. medical outer sheath as claimed in claim 8, which is characterized in that the gas deflation assembly includes attachment base and is set to institute The connecting tube on attachment base is stated, the attachment base is respectively fixedly connected with the medical outer sheath, the connecting tube and the sealing Component, the transfer passage in cavity and the medical outer sheath in the connecting tube, the attachment base and the seal assembly It is mutually communicated, valve is provided in the connecting tube, the valve controls the on-off of the connecting tube, and the valve is in the doctor Opening when being vented with outer sheath.

10. medical outer sheath as claimed in claim 9, which is characterized in that the seal assembly further includes the first sealing knob With the second sealing knob, the first sealing knob and the second sealing knob are fixedly installed on the two of the seal respectively End, the first sealing knob are fixedly connected with the seal and the attachment base, and the second sealing knob is arranged described close Sealing assembly is simultaneously fixedly connected with the attachment base.

11. a kind of catheter sheath, which is characterized in that the catheter sheath includes that expansion is managed and as described in claim any one of 1-10 Medical outer sheath, the expansion pipe be arranged in the medical outer sheath and from the both ends of the medical outer sheath stretch out.

12. catheter sheath as claimed in claim 11, which is characterized in that it is additionally provided with grip part on the expansion pipe, it is described to hold The portion of holding is set to the expansion and manages close to one end of the seal assembly.

13. catheter sheath as claimed in claim 11, which is characterized in that development mark is additionally provided on the expansion pipe, it is described Development mark is for showing the relative position between the medical outer sheath and the expansion pipe.

14. catheter sheath as claimed in claim 11, which is characterized in that offered on the expansion pipe along center axis thereof direction Through-hole.