CN215129734U - Injection device for endoscope - Google Patents

Abstract

The utility model relates to a medical appliance, in particular to an injection device for an endoscope. The method comprises the following steps: an outer sheath member extending from a proximal end to a distal end; a priming tube having a fluid passage, the priming tube being positioned at least partially within the outer sheath member, the priming tube having a piercing tip and being movable relative to the outer sheath member; an operating means operated at the proximal end of the outer sheath member for extending and retracting the site toward and into the distal end of the outer sheath member; wherein at least a partial region near the distal end of the outer sheath member is composed of a transparent material, and correspondingly, at least a partial region near the distal end of the infusion tube is composed of a transparent material.

Description

Injection device for endoscope

Technical Field

The utility model relates to a medical appliance, in particular to an injection device for an endoscope.

Background

Among the current alimentary canal scope operation treatment procedure, different liquid delivery devices are still by the wide application in operation procedures such as hemostasis, varicosity treatment except carrying out the injection procedure under the mucosa, and more common form is for extending along scope apparatus passageway, and it covers the syringe needle device that has flexible sheath pipe, and it is provided with notes liquid mouth connecting portion at human near-end, realizes the liquid delivery to the distal end through with the cylinder to annotating the interior propelling movement liquid of liquid mouth.

The following problems exist in the use of injection needles:

on one hand, especially when the submucosal dissection operation is performed and the submucosal injection is performed, because the tissue gap is loose and the injection is easy to absorb, in order to keep the mucosa to be raised, the injection needs to be continuously poured into the mucosa, the action of frequently replacing the needle cylinder for fluid infusion prolongs the matching time among medical personnel, and the operation risk is increased;

on the one hand, the inability of the physician to confirm that the needle has penetrated the correct location while performing the injection procedure also increases the time and risk of the procedure, for example, in the treatment of varicose veins, where penetration of the needle into the vessel is required, and submucosal ridges where penetration of the vessel is undesirable;

on one hand, as a doctor may need to perform a plurality of surgical operations of instruments during surgery, the existing injection needle needs to be matched by two hands, so that the surgery efficiency of the doctor is reduced;

on the other hand, in order to improve the user experience, the size of the palm of the user needs to be considered in the design process of the injection needle handle, and the axial length of the instrument needs to be reduced.

Disclosure of Invention

In order to solve the above problems, there is provided an injection device for an endoscope, comprising:

an outer sheath member extending from a proximal end to a distal end;

a priming tube having a fluid passage, the priming tube being positioned at least partially within the outer sheath member, the priming tube having a piercing tip and being movable relative to the outer sheath member;

an operating means operated at the proximal end of the outer sheath member for extending and retracting the site toward and into the distal end of the outer sheath member;

wherein at least a partial region near the distal end of the outer sheath member is composed of a transparent material, and correspondingly, at least a partial region near the distal end of the infusion tube is composed of a transparent material.

Further, the outer sheath member includes a first spring tube extending distally from the operation device;

a second spring tube disposed near the distal end of the outer sheath member;

and the transparent tube is coated on the far end of the first spring tube and the second spring tube, and a visible part is formed between the first spring tube and the second spring tube.

Also provided is an injection device for an endoscope, comprising

An outer sheath member extending from a proximal end to a distal end;

a priming tube having a fluid passage, the priming tube being positioned at least partially within the outer sheath member, the priming tube having a piercing tip and being movable relative to the outer sheath member;

an operating device which is operated at the proximal end of the outer sheath member for extending and retracting the site toward and into the distal end of the outer sheath member, the operating device comprising:

the liquid storage body is provided with a liquid storage cavity and is hermetically connected with the liquid injection pipe, and a one-way liquid inlet device is arranged on the liquid storage body;

a liquid feeding member liquid-tightly arranged on the liquid storage body, a liquid feeding channel is arranged in the liquid feeding member, the near end of the liquid injection tube is liquid-tightly arranged in the liquid feeding channel, a switching member is arranged on the liquid feeding member,

in the liquid supplementing state, the switching component separates the liquid feeding channel from the liquid storage cavity in a liquid-tight manner;

and in the liquid injection state, the switching component is used for communicating the liquid conveying channel with the liquid storage cavity.

Further, the switching member includes a first stopper provided at a distal end of the liquid feeding member, a second stopper provided at a proximal end side of the first stopper, and a sealing means liquid-tightly engaged with the peripheral wall of the liquid storage chamber and movable between the first stopper and the second stopper,

wherein when the sealing device is combined with the first blocking part, the liquid storage cavity is sealed;

when the sealing device is combined with the second blocking part to seal the liquid storage cavity, the liquid feeding channel is communicated with the liquid storage cavity.

Further, the outer diameter of the first stop is larger than the inner diameter of the sealing device at the distal side.

Furthermore, a liquid guide path is formed in the second blocking portion, and when the sealing device is combined with the second blocking portion to seal the liquid storage cavity, the liquid guide path enables the liquid conveying channel to be communicated with the liquid storage cavity.

Furthermore, a bridge part is arranged between the first blocking part and the second blocking part, the outer diameter of the bridge part is smaller than the inner diameter of the far end side of the sealing device, the outer diameter of the second blocking part is larger than the inner diameter of the near end side of the sealing device,

and in the liquid injection state, one end of the liquid guide path is communicated with the gap between the sealing device and the bridging part.

Furthermore, the sealing device is hollow, the inner cavity of the sealing device is gradually reduced from the near end to the far end, and the outer diameter of the second blocking part is larger than the diameter of the farthest end of the inner cavity.

Further, an inlet of the liquid guiding path is provided on a distal end face of the second blocking portion.

Further, a sealing element is arranged between the periphery of the liquid injection pipe and the liquid feeding cavity.

The utility model discloses under control cost's prerequisite, in promoting doctor's operation efficiency and security aspect, gained and showing the effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is an overall sectional view of the present invention.

Fig. 2 is a cross-sectional view of a liquid storage body according to a first embodiment of the present invention.

Fig. 3 is a side view of the first embodiment of the present invention from another perspective.

Fig. 4 is a perspective view of the first embodiment of the stop base of the present invention.

Fig. 5 is a sectional view of the liquid feeding rod according to the first embodiment of the present invention.

Fig. 6 is a sectional view of the sealing sleeve according to the first embodiment of the present invention.

Fig. 7A is a schematic structural diagram of an exchange joint according to a first embodiment of the present invention.

Fig. 7B is a cross-sectional view of the liquid filling pipe and the liquid feeding push rod of the first embodiment of the present invention at the position of fig. 5A-a under the condition that the sealing sleeve is sleeved on the sealing sleeve.

Fig. 8 is a schematic structural view of a base according to a first embodiment of the present invention.

Fig. 9 is a schematic structural view of the fixing cover according to the first embodiment of the present invention.

Fig. 10A is a schematic diagram of the relative position relationship between the crossover sub and the sealing sleeve after the fluid replacement operation is performed according to the first embodiment of the present invention.

Fig. 10B is a schematic diagram of the relative position relationship between the crossover sub and the sealing sleeve after the injection operation is performed according to the first embodiment of the present invention.

Detailed Description

The explanations and illustrations presented herein are intended to acquaint others skilled in the art with the disclosure, its principles, and its practical application. Those skilled in the art may adapt and apply the disclosure in its numerous forms, as may be best suited to the requirements of a particular use. The specific embodiments set forth in this disclosure are not intended to be exhaustive or limiting of the invention. The scope of the invention should be determined, not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The terms "one aspect," "one embodiment," "an embodiment," "another embodiment," "some embodiments," "other embodiments," and similar language indicate that the embodiment or embodiments described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it will be understood by those skilled in the art that such feature, structure, or characteristic may be combined with other embodiments whether or not explicitly described unless clearly indicated to the contrary. That is, as one of ordinary skill in the art will appreciate, the individual elements described below are contemplated as being combinable with one another to form additional embodiments or to supplement and/or enrich one or more of the described embodiments, even if not explicitly shown in a particular combination.

The articles "a," "an," and "the" are used herein to refer to one or to more than one (i.e., to at least one) of the grammatical object of the article, unless clearly indicated to the contrary. For example, "an element" means one element or more than one element.

The term "including" is used herein to mean, and is used interchangeably with, the phrase "including, but not limited to". The term "or" is used herein to mean, and is used interchangeably with, the term "and/or," unless the context clearly indicates otherwise.

The term "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to". As used herein, the term "about" is understood to be within the normal accepted range of the art, e.g., within the standard deviation of the mean, unless the context clearly indicates otherwise.

The terms "proximal" and "proximal" are used herein to mean the position or direction closest to the user of the device and are the opposite position or direction from the terms "distal" and "distal".

The terms "distal" and "distal" are used herein to mean the position or direction furthest from the user of the device and are the opposite positions or directions from the terms "proximal" and "proximal".

The term "intraluminal" refers to or describes the interior or inner side of cavities, ducts, and other passageways or cavities within the body of a human or other animal. The lumen or body passageway may be an existing lumen or a lumen created by surgical intervention. As used in this specification, the term "lumen" is intended to have a broad meaning and encompasses any conduit (e.g., natural or iatrogenic) or cavity within the human body and may include, but is not limited to: urethral and ureteric passages, blood vessels, respiratory passages, gastrointestinal tracts such as bile ducts, intestines, esophagus, pericardial cavity, thorax, etc. Accordingly, the terms "endoluminal device" or "endoluminal prosthesis" describe a device that can be placed within or moved through any such lumen or conduit.

The present invention will be described in further detail with reference to the following examples, which are illustrative of the present invention and are not intended to limit the present invention.

In the embodiment shown in fig. 1, the medical device 100 includes a reservoir 110, and a liquid feeding plunger 120 and a base 130 covering the reservoir 110 are fluid-tightly sleeved in the reservoir 110.

As shown in fig. 2 and 3, a liquid storage cavity 111 is axially and penetratingly arranged on the liquid storage body 110 for the liquid feeding push rod 120 to slide in the liquid storage body 110 in a liquid-tight manner, and a distal end of the liquid storage cavity 111 has a shape, such as a cone, matched with a distal end of the liquid feeding push rod 120. The distal end of the reservoir body 110 has a small diameter portion 112 and a filling connector 113 disposed along the axial direction of the reservoir body 110, the filling connector 113 is threadedly connected to a check valve 140, and the liquid is delivered from the check valve 140 to the filling connector 113. A spool-shaped sliding finger ring part 114 is arranged near the proximal end of the liquid storage body 110, a locking mechanism 115 for matching with the base 130 is arranged at the distal end of the sliding finger ring part 114, and the locking mechanism 115 comprises an unlocking key 115b arranged on the sliding finger ring part 114 and a locking step 115a which protrudes inwards in the radial direction of the liquid storage body 110 and is arranged on the distal side of the unlocking key 115b relatively. A fixing hole 114a is formed near the sliding ring part 114 along the radial direction of the liquid storage body 110 for assembling the stop base 116.

Referring to fig. 4, the stopping base 116 is disposed and sleeved outside the liquid feeding push rod 120, and the front end of the stopping base has two elastic arms 117 (or a plurality of arms), each elastic arm 117 includes an extension arm 117a and a buckle 117b disposed outside the extension arm, wherein the buckle 117b is fastened to the fixing hole 114a, and an inner diameter of a cavity between the elastic arms 117 is larger than an outer diameter of the infusion segment 123 and smaller than an outer diameter of a proximal side of the sealing sleeve 128, so as to prevent the liquid feeding push rod 120 from being separated from the liquid storage body 110 due to excessive movement.

As shown in fig. 5, a thumb ring 121 is arranged at the proximal end of the liquid feeding push rod 120, a fastening section 122, an infusion section 123, an exchange joint 124, a bridging section 125 and a pushing end 126 are connected with the thumb ring 121 in sequence from the distal side, and a liquid feeding cavity 127 penetrates through the infusion section 123, the exchange joint 124, the bridging section 125 and the pushing end 126. The outer diameter of the exchange joint 124 is larger than that of the bridging section 125 and the infusion section 123, a plurality of proximally-opened liquid guide ports 124a are formed on a step 125a formed by the intersection interface of the far end and the bridging section 125, a plurality of liquid guide channels 124b are arranged along the liquid conveying push rod 120 radially inwards to intersect with the liquid guide ports 124a, and the liquid guide channels 124b are communicated with the liquid conveying cavity 127.

The crossover connection 124 and the bridge segment 125 carry a boot seal 128, as shown in fig. 6, the boot seal 128 having a distally stepped reducing hollow structure with a small diameter segment 128a and a large diameter segment 128b disposed proximally of the small diameter segment 128 a.

As shown in fig. 7A and 7B, the inner diameter of the small-diameter section 128a is smaller than the outer diameter of the step 125a and the outer diameter of the proximal end of the pushing tip 126, while the inner diameter of the small-diameter section 128a is slightly larger than the outer diameter of the bridging section 125, so that the distal end surface of the sealing sleeve 128 is in fluid-tight engagement with the proximal end surface of the pushing tip 126 in the fluid infusion state in which the fluid delivery push rod 120 is pushed distally relative to the fluid storage body 110; in a liquid injection state that the liquid feeding push rod 120 is pulled towards the proximal end relative to the liquid storage body 110, a step surface 128c formed at the junction of the small-diameter section 128a and the large-diameter section 128b is in liquid-tight abutting contact with the step 125a, and the liquid guide port 124a is communicated with the liquid storage cavity 111 around the bridging section 125.

The crossover fitting 134 is provided with a first rib 124c and a second rib 124d on the proximal side of the fluid-conducting channel 124b for cooperating with the sealing boot 128 to form a fluid-tight space in front of the first rib 124c and the second rib 124d, where the first rib 124c and the second rib 124d are provided in duplicate to ensure a fluid-tight state, and a rib may be provided. The bridge segment 125 is configured to be carried in a small diameter segment 128a of the boot seal 128, and the small diameter segment 128a has an axial length less than that of the bridge segment 125, such that the distal end of the boot seal 128 is movable between the proximal end of the thrust tip 126 and the step 125a, enabling switching between fluid replacement and fluid injection states.

Referring to fig. 1, a liquid feeding chamber 127 is provided with a liquid feeding tube 129 made of any flexible transparent material, the proximal end of the liquid feeding tube 129 is fixed to the liquid storage body 110 at the small diameter portion 112, and the distal end of the liquid feeding tube 129 is communicated with an injection needle 129 a. The pushing tip 126 is provided with a seal ring 126a which is always liquid-tightly joined to the liquid inlet pipe 129. In the fluid infusion state, the distal end face of the sealing sleeve 128 is combined with the proximal end face of the propelling head 126 in a fluid-tight manner, and the injection fluid enters the liquid storage cavity 111 from the one-way valve 140 for storage; in the liquid injection state, the step surface 128c is liquid-tightly abutted against the step 125a, the outer diameter of the pushing end head 126 is smaller than the inner diameter of the liquid storage cavity 111, the injection liquid bypasses the pushing end head 126 from the liquid storage cavity 111 in sequence, then flows through the liquid guide port 124a and the liquid guide tube 124b to enter the liquid injection cavity 127, and finally is sent to the far end from the liquid injection tube 129 in the liquid injection cavity 127. The sealing ring 126a strengthens the isolation of the liquid feeding cavity 127 and the liquid storage cavity 111, prevents negative pressure in the liquid storage cavity 111 at the front end of the propelling tip 126 from being transmitted to the liquid injection cavity 127, and reduces the risk that the liquid feeding push rod 120 is accidentally sucked reversely due to too high liquid supplementing speed or pulling under idle load. When the gap between the liquid injection tube 129 and the distal end of the liquid delivery chamber 127 is sufficiently small, the liquid delivery chamber 127 and the liquid storage chamber 111 can be separated in a liquid-tight manner even for an injection liquid having a certain concentration. Compared with the prior art that a check valve is additionally arranged at the front end of the liquid storage body 110, the scheme of the embodiment is more intensive, the overall length and the volume of the operation part of the medical apparatus 100 are reduced, the operation of a user is facilitated, and meanwhile, the manufacturing and packaging costs are reduced.

Referring to fig. 1 and 8, the base 130 includes a housing 132, a grip 131 is fixedly disposed at a proximal end of the housing 132, a sliding groove 133 is axially disposed at an upper portion of the housing 132, the injection connector 113 slides along the sliding groove 133, and a blocking portion 134 is disposed at a proximal end of the sliding groove 133 for blocking the injection connector 113 from separating from the housing 132. A locking piece 135 is provided on the outer peripheral side surface of the outer cover 132 to be engaged with the locking mechanism 115, and the front end of the inner cavity of the outer cover 132 is abutted against a spring 132a fitted over the small diameter portion 112, so that the locking piece 135 is releasably engaged with the locking mechanism 115. The distal end of the base 130 is further provided with an actuating base 136 and a fixing cover 137 covering the actuating base 136, the actuating base 136 is axially and radially provided with a containing groove 136b, the shape of the containing groove 136b is the same as that of the proximal end of the conveying part 150, the outer side of the distal end of the containing groove 136b is provided with a locking buckle 136a, referring to fig. 9, the actuating base 136 is covered with the fixing cover 137, the fixing cover 137 is divided into a covering section 137a and a transition section 137b from the near to the far, the covering section 137a is provided with a locking window 137c, and the locking window 137c is matched with the locking buckle 136a of the actuating base 136 to fix the conveying part 150 at the distal end of the base 130.

As shown in FIG. 1, the delivery unit 150 includes a spring tube 152 covering the injection tube 129, the spring tube 152 is covered by an outer sheath tube 151, and an end cap 154 is provided at the distal end of the spring tube 152. In this embodiment, an extension tube 152a is separated from the vicinity of the distal end of the spring tube 152, the extension tube 152a is connected to the spring tube 152 by an observation section 155 formed by covering a transparent tube 153 made of a transparent material, and a user can observe the blood return in the filling tube 129 through the observation section 155. In other embodiments, the sheath 151 may be provided entirely of any suitable transparent material, such as a transparent polymer-based material (i.e., transparent plastic, etc.) as is known in the art, or the spring tube 152 may be eliminated, with only the transparent sheath 151 and the infusion tube 129. The spring tube 152 of the present embodiment provides a stronger axial actuation force.

The working principle of the medical instrument 100 is described below.

In the initial state, the locking mechanism 115 of the liquid storage body 110 is not engaged with the locking piece of the base 130, the distal end of the liquid delivery push rod 120 is positioned at the farthest end of the liquid storage cavity 111, and the injection needle 129a is kept in the distal end of the conveying part 150; on the other hand, an external reservoir unit (not shown) is connected to the check valve 140.

In use, a user inserts the delivery section 150 into an endoscopic instrument channel (not shown) until the injection site to be endoluminally reached;

furthermore, a thumb of a user inserts into the thumb ring 121, and a forefinger and a middle finger are buckled on the holding part 131 to perform a gripping operation until the locking step 115a is clamped with the locking piece 135, and the injection needle 129a fixedly extends out of the far end of the conveying part 150;

further, the user inserts the injection needle 129a into the target tissue by the hand-held transport unit 150, determines whether the injection needle is inserted at a desired position by observing the blood returning state of the observation section 155 in the endoscope visual field, and performs the insertion operation again if the observation result does not match the desired position;

further, as shown in fig. 1, 6, 7A and 10A, the index finger and the middle finger of the user are buckled on the sliding ring part 114, and move away from the thumb of the thumb ring 121 to perform the fluid infusion, at this time, the distal end surface of the sealing sleeve 128 and the proximal end surface of the pushing tip 126 are supported and moved proximally in a fluid-tight manner, so that a negative pressure is formed in the reservoir cavity 111, and the injection fluid in the external reservoir unit enters the reservoir cavity 111 through the one-way valve 140 and is stored between the distal end surface of the sealing sleeve 128 and the distal end surface of the reservoir cavity 111;

further, as shown in fig. 1, 6, 7A, 7B, and 10B, the index finger and the middle finger of the user are buckled on the sliding ring part 114, and are matched with the thumb in the thumb ring 121 to perform the injection action, at this time, the step surface 128c in the sealing sleeve 128 abuts against the step 125a at the front end of the exchange joint 124, the liquid guide port 124a is exposed to the injection liquid in the small diameter section 128a at the distal end side thereof, and as the liquid feeding push rod 120 moves distally, the injection liquid enters the injection tube 129 in the liquid feeding cavity 127 through the liquid guide port 124a and the liquid guide channel 124B, and is finally conveyed to the injection needle 129a along the injection tube 129;

when the injection liquid in the liquid storage cavity 111 is completely injected and the liquid is needed to be replenished again in the operation, the liquid replenishing action is repeatedly executed, and the proximal end surface of the sealing sleeve 128 can be abutted against the distal end surface of the extension arm 117a, so that the liquid feeding push rod 120 is prevented from being separated from the liquid storage body 110 due to the transitional execution of liquid replenishing;

when the injection process is finished, before the medical device 100 exits the device channel, the user uses the index finger or the middle finger to tap the unlocking key 115b, the unlocking key 115b presses the proximal end of the locking piece 135, so that the locking piece 135 is separated from the locking step 115a, under the reaction of the spring 132a, the distal end of the liquid storage body 110 is separated from the front end of the outer cover 132 of the base 130, so that the injection needle 129a is accommodated in the distal end of the delivery part 150.

It will be understood that a variety of different materials may be used to form the devices herein. In some embodiments, a variety of different metals may be used. Illustrative, but non-limiting examples of suitable metals include titanium, stainless steel, magnesium, cobalt chromium, and others. For example, in some embodiments, the devices described herein can comprise any suitable polymeric material, including biocompatible materials, such as polyurethane or silicone. Other suitable polymers include, but are not limited to, Polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene (ETFE), Fluorinated Ethylene Propylene (FEP), Polyoxymethylene (POM), polyether block esters, polyurethanes (e.g., polyurethane 85A), polypropylene (PP), polyvinyl chloride (PVC), polyether esters, ether or ester based copolymers (e.g., butylene/poly (alkylene ether) phthalate) and/or other polyester elastomers, elastomeric polyamides, block polyamides/ethers, polyether block amides (PEBA), ethylene vinyl acetate copolymers (EVA), silicones, Polyethylene (PE), malac high density polyethylene, malac low density polyethylene, linear low density polyethylene, polyesters, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polypropylene terephthalate, polyethylene naphthalate (PEN), Polyetheretherketone (PEEK), Polyimide (PI), Polyetherimide (PEI), polyphenylene sulfide (PPS), polyphenylene oxide (PPO), polyterephthalamide, polysulfone, nylon, perfluoro (propyl vinyl ether) (PFA), ethylene vinyl alcohol, polyolefin, polystyrene, epoxy, polyvinylidene chloride (PVDC), poly (styrene-b-isobutylene-b-styrene), polycarbonate, ionomer, biocompatible polymer, other suitable material, or mixtures, combinations, copolymers, polymer/metal composites thereof, and the like.

In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes made according to the structure, characteristics and principle of the inventive concept are included in the protection scope of the invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (10)

1. An injection device for an endoscope, comprising:

an outer sheath member extending from a proximal end to a distal end;

a priming tube having a fluid passage, the priming tube being positioned at least partially within the outer sheath member, the priming tube having a piercing tip and being movable relative to the outer sheath member;

an operating means operated at the proximal end of the outer sheath member for extending and retracting the site toward and into the distal end of the outer sheath member;

wherein at least a partial region near the distal end of the outer sheath member is composed of a transparent material, and correspondingly, at least a partial region near the distal end of the infusion tube is composed of a transparent material.

2. The endoscopic injection device according to claim 1, wherein:

the outer sheath member includes a first spring tube extending distally from an operating device;

a second spring tube disposed near the distal end of the outer sheath member;

and the transparent tube is coated on the far end of the first spring tube and the second spring tube, and a visible part is formed between the first spring tube and the second spring tube.

3. An injection device for an endoscope, comprising:

an outer sheath member extending from a proximal end to a distal end;

a priming tube having a fluid passage, the priming tube being positioned at least partially within the outer sheath member, the priming tube having a piercing tip and being movable relative to the outer sheath member;

an operating device which is operated at the proximal end of the outer sheath member for extending and retracting the infusion tube distally to and into the outer sheath member, the operating device comprising:

the liquid storage body is provided with a liquid storage cavity and is hermetically connected with the liquid injection pipe, and a one-way liquid inlet device is arranged on the liquid storage body;

a liquid feeding member liquid-tightly provided to the liquid storage body, the liquid feeding member having a liquid feeding channel therein, the proximal end of the liquid injection tube being liquid-tightly provided to the liquid feeding channel, the liquid feeding member being provided with a switching member,

in a liquid supplementing state, the switching component separates the liquid feeding channel from the liquid storage cavity in a liquid-tight manner;

and in the liquid injection state, the switching component communicates the liquid feeding channel with the liquid storage cavity.

4. The endoscopic injection device according to claim 3, wherein:

the switching member comprises a first blocking part arranged at the far end of the liquid sending member, a second blocking part arranged at the near end side of the first blocking part, and a sealing device which is combined with the peripheral wall of the liquid storage cavity in a liquid-tight manner and can move between the first blocking part and the second blocking part,

wherein the reservoir chamber is sealed when the sealing device is engaged with the first barrier;

when the sealing device is combined with the second blocking part to seal the liquid storage cavity, the liquid conveying channel is communicated with the liquid storage cavity.

5. The endoscopic injection device according to claim 4, wherein:

the first stop has an outer diameter greater than the sealing device distal side inner diameter.

6. The endoscopic injection device according to claim 4, wherein:

and when the sealing device is combined with the second blocking part to seal the liquid storage cavity, the liquid guide path communicates the liquid conveying channel with the liquid storage cavity.

7. The endoscopic injection device according to claim 6, wherein:

a bridge part is arranged between the first blocking part and the second blocking part, the outer diameter of the bridge part is smaller than the inner diameter of the distal side of the sealing device, the outer diameter of the second blocking part is larger than the inner diameter of the proximal side of the sealing device,

and in the liquid injection state, one end of the liquid guide path is communicated with the gap between the sealing device and the bridging part.

8. The endoscopic injection device according to claim 7, wherein:

the sealing device is hollow, the inner cavity of the sealing device is gradually reduced from the near end to the far end, and the outer diameter of the second blocking part is larger than the diameter of the farthest end of the inner cavity.

9. The endoscopic injection device according to claim 7, wherein:

the inlet of the liquid guide path is arranged on the distal end face of the second blocking part.

10. The endoscopic injection device according to claim 7, wherein:

and a sealing element is arranged between the periphery of the liquid injection pipe and the liquid conveying cavity.

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