Injection assembly and endoscope
Patent Information
- Application Number
- PCT/CN2026/083815
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-21
- Filing Date
- 2026-03-17
- Publication Date
- 2026-09-24
Smart Images
Figure CN2026083815_24092026_PF_FP_ABST
Abstract
Description
An injection component and an endoscope Technical Field
[0001] This application relates to the field of medical device technology, and in particular to an injection assembly and an endoscope. Background Technology
[0002] An endoscope is a commonly used medical device that can be inserted directly into the body's natural passageways to provide doctors with comprehensive diagnostic information for disease treatment. However, current procedures involving the injection of medication into the uterine wall using an endoscope are prone to the problem of multiple injections in the same area.
[0003] Therefore, providing an injection component and endoscope that can mark injection sites is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0004] This application discloses an injection assembly and an endoscope to address the technical problem in related technologies where intrauterine wall injections often result in multiple injections in a single area. To solve the above problem, this application adopts the following technical solution:
[0005] In a first aspect, an injection component is disclosed, comprising:
[0006] The insertion section extends from the proximal end to the distal end and has a suction channel and an injection channel; the injection channel is used to guide the drug from the proximal end of the injection channel to the distal end of the injection channel for discharge;
[0007] An injection structure for puncturing human tissue includes several first injection needles; the several first injection needles are located at the distal end of the insertion part and are connected to the drug injection channel.
[0008] A labeling tube extends from the proximal end to the distal end and is disposed within the aspiration channel; the labeling tube has an injection channel for guiding the dye from the proximal end of the injection channel to the distal end of the injection channel for discharge.
[0009] The distal end of the marking tube does not extend beyond the distal end of the first injection needle.
[0010] In a second aspect, an endoscope is disclosed, including an endoscope handle, an injection unit, and the injection assembly described in the first aspect.
[0011] The injection section is located on the instrument mouth of the endoscope handle. The proximal ends of the insertion section and the marker tube extend into the endoscope handle and communicate with the injection section. The injection section is used to deliver drugs into the injection channel and to deliver dyes into the injection channel.
[0012] The technical solution adopted in this application can achieve the following beneficial effects:
[0013] The injection assembly of this application allows for the use of a plurality of first injection needles to puncture human tissue during injection. The medication can then travel from the proximal end to the distal end of the injection channel and enter the human tissue through the first injection needles. During the injection process, dye moves from the proximal end of the injection channel to the distal end and is discharged, marking the human tissue. When a doctor administers multiple injections to the human tissue, the marked locations can be observed to determine if an injection has occurred, thus avoiding the problem of multiple injections in the same area. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 is an isometric view of the endoscope of this application;
[0016] Figure 2 is an enlarged view of point A in Figure 1;
[0017] Figure 3 is an isometric view of the injection assembly of this application;
[0018] Figure 4 is an enlarged view of point B in Figure 3;
[0019] Figure 5 is an isometric view of the injection assembly of this application.
[0020] Figure 6 is an enlarged view of point C in Figure 5;
[0021] Figure 7 is a cross-sectional view of the endoscope of this application;
[0022] Figure 8 is an enlarged view of point D in Figure 7;
[0023] Figure 9 is a cross-sectional view of the injection component of this application;
[0024] Figure 10 is an enlarged view of point E in Figure 9;
[0025] Figure 11 is a cross-sectional view of the injection component of this application;
[0026] Figure 12 is an enlarged view of point F in Figure 11;
[0027] Figure 13 is an isometric view of the injection assembly of this application.
[0028] Figure 14 is a cross-sectional view of the injection section of this application.
[0029] In the picture:
[0030] 100-Injection assembly, 110-Insertion part, 111-Insertion tube, 112-Drug sheath, 120-Injection structure, 121-First injection needle, 122-Second injection needle, 130-Aspiration channel, 140-Drug injection channel, 141-Delivery channel, 142-Distribution channel, 150-Marking tube, 151-Beveled cut, 152-Injection channel, 160-Injection tube;
[0031] 200-Endoscope, 210-Endoscope handle, 220-Injection section, 221-Injection cartridge, 222-Piston, 223-Cavity. Detailed Implementation
[0032] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence.
[0033] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".
[0034] The inventors discovered during use that in existing surgeries using an endoscope 200 to inject medication into the uterine wall, inexperienced doctors may repeatedly inject due to unfamiliarity with the procedure, while experienced doctors may experience similar problems due to fatigue or distraction. Furthermore, the uterine wall tissues have a similar appearance and lack clear markings, making it difficult for doctors to accurately distinguish between injected and uninjected areas, increasing the risk of repeated injections and potentially leading to multiple injections in the same area.
[0035] The injection component 100 and endoscope 200 provided in this application will be described in detail below with reference to Figures 1 to 14, through specific embodiments and application scenarios.
[0036] Some embodiments of this application disclose an injection assembly 100, as shown in Figures 2, 8 and 12, which includes an insertion part 110, an injection structure 120 and a marking tube 150.
[0037] As shown in Figures 1, 2, 3, 5, 9, 11 and 13, the insertion part 110 extends from the proximal end to the distal end, forming a slender tubular structure that allows it to be smoothly inserted into the human body cavity.
[0038] As shown in Figures 2, 6, 8 and 10, the injection structure 120 includes a plurality of first injection needles 121 for piercing human tissue.
[0039] As shown in Figures 4 and 9, the insertion part 110 has a drug injection channel 140, and a plurality of first injection needles 121 are disposed at the distal end of the insertion part 110 and communicate with the drug injection channel 140. During the operation, the insertion part 110 is inserted into the human cavity, causing the plurality of first injection needles 121 to puncture the human tissue. The drug injection channel 140 guides the drug from the proximal end of the drug injection channel 140 to the distal end of the drug injection channel 140 for discharge, and then enters the human tissue through the plurality of first injection needles 121.
[0040] In this embodiment, the cross-section of the plurality of first injection needles 121 can be circular, elliptical, polygonal, or other shapes. This embodiment can be flexibly set according to the usage requirements, and there is no limitation on this here.
[0041] It should be noted that in this embodiment, the human body cavity refers to the vagina, and the human body tissue refers to the uterine wall; the same applies below.
[0042] As shown in Figures 2, 4, 6, and 8-13, the insertion part 110 also has an aspiration channel 130. A marking tube 150 is disposed within the aspiration channel 130 and extends from the proximal end to the distal end, and the marking tube 150 has an injection channel 152. During the procedure, the insertion part 110 is inserted into the body cavity, and the dye moves from the proximal end of the injection channel 152 to the distal end of the injection channel 152 and is discharged, marking the body tissue. During the injection, the doctor can observe whether the area is marked, thus determining whether an injection has been performed there. This facilitates the doctor's accurate differentiation between injected and uninjected areas, avoiding duplicate injections.
[0043] As shown in Figures 8, 10, and 12, the distal end of the marking tube 150 does not extend beyond the distal end of the first injection needle 121. During the surgery, the insertion part 110 is inserted into the human cavity, and several first injection needles 121 puncture human tissue. Because the distal end of the marking tube 150 does not extend beyond the distal end of the first injection needle 121, the marking tube 150 can avoid compressing the human tissue during the puncture of the human tissue, thus preventing the situation where several first injection needles 121 cannot successfully puncture the human tissue.
[0044] As shown in Figures 8, 10, and 12, the distal end of the marking tube 150 is located within the aspiration channel 130, and the proximal end of the aspiration channel 130 is used to connect to a negative pressure device. During the procedure, the insertion part 110 is inserted into the human tissue, and the negative pressure device operates within the aspiration channel 130 to create negative pressure, drawing the human tissue in that area into the aspiration channel 130. Firstly, this tightens the human tissue around the center of the injection area, improving puncture efficiency. Secondly, the negative pressure also removes excess dye, preventing excessive dye spread in the injection area and ensuring the doctor can observe the center of the injection area. Thirdly, because human tissue is relaxed, the negative pressure allows it to be drawn and gathered within the aspiration channel 130. After the first injection needle 121 completes the injection and the negative pressure disappears, the human tissue returns to its original state, allowing for a wider injection area.
[0045] It should be noted that negative pressure equipment can be manually controlled, thereby causing negative pressure to be generated or eliminated.
[0046] As shown in Figures 2, 6, 8, and 10, there are at least two first injection needles 121, which are evenly arranged circumferentially along the insertion portion 110. The simultaneous operation of multiple injection needles can significantly shorten injection time and improve overall injection efficiency.
[0047] As shown in Figures 8, 10, and 12, the distal end of the marking tube 150 is fixedly disposed on the inner wall of the suction channel 130 near the axis of the insertion part 110. It should be noted that when the injection assembly 100 is used with the endoscope 200, a camera module is integrated at the distal end of the insertion part 110. To facilitate the installation of the camera module, the suction channel 130 needs to be offset from the insertion part 110. Therefore, by fixing the distal end of the marking tube 150 on the inner wall of the suction channel 130 near the axis of the insertion part 110, the marking tube 150 can be positioned as close as possible to the axis of the insertion part 110, thereby ensuring that the marking tube 150 marks the injection area as centrally as possible during the marking of human tissue.
[0048] And / or, as shown in Figures 8, 10, and 12, the distal end of the marking tube 150 has a bevel 151. The bevel 151 is fixed to one side of the marking tube 150 in the suction channel 130 and slopes towards the proximal end of the marking tube 150 radially to the other side. By providing the bevel 151, when human tissue is attracted and gathered in the suction channel 130, the contact area between the marking tube 150 and the human tissue can be increased, thereby better marking the injection area.
[0049] As shown in Figures 2 and 8, the injection structure 120 also includes a number of second injection needles 122, which have the same function as the number of first injection needles 121, and are all used to puncture human tissue.
[0050] As shown in Figures 2 and 8, a plurality of second injection needles 122 are disposed at the distal end of the insertion portion 110 and communicate with the drug injection channel 140. During the operation, the insertion portion 110 is inserted into the human cavity, causing the plurality of second injection needles 122 to puncture the human tissue. The drug injection channel 140 guides the drug from the proximal end of the drug injection channel 140 to the distal end of the drug injection channel 140 for discharge, and then enters the human tissue through the plurality of second injection needles 122.
[0051] As shown in Figure 2, the distal end of either the first injection needle 121 or the second injection needle 122 is located outside the distal ends of all the other needles. The plurality of first injection needles 121 and the plurality of second injection needles 122 form two injection layers of different diameters, allowing the drug to cover a wider area more quickly, thereby improving injection efficiency.
[0052] In some embodiments, the second injection needle 122 is located outside the first injection needle 121.
[0053] In some embodiments, the first injection needle 121 is located outside the second injection needle 122.
[0054] As shown in Figures 2 and 12, a plurality of first injection needles 121 and / or a plurality of second injection needles 122 are configured to have an deployed state and a retracted state. In the deployed state, the distal ends of the plurality of first injection needles 121 and / or the distal ends of the plurality of second injection needles 122 are located radially outward of the insertion portion 110; in the retracted state, the distal ends of the plurality of first injection needles 121 and the distal ends of the plurality of second injection needles 122 are located radially inward of the insertion portion 110. The plurality of first injection needles 121 and / or the plurality of second injection needles 122 can switch between the deployed state and the retracted state.
[0055] When in the retracted state, the distal ends of several first injection needles 121 and / or several second injection needles 122 are located radially inside the insertion portion 110 to minimize the diameter formed by the first injection needles 121 and / or several second injection needles 122, allowing the insertion portion 110 to be smoothly inserted into the human body cavity. After the insertion portion 110 reaches the injection area, the first injection needles 121 and / or several second injection needles 122 switch to the unfolded state, with the distal ends of the first injection needles 121 and / or several second injection needles 122 located radially outside the insertion portion 110 to increase the diameter of the distal ends of the first injection needles 121 and / or several second injection needles 122, thereby increasing the injection range.
[0056] In some embodiments, when in the unfolded state, the distal ends of a plurality of first injection needles 121 are located radially inside the insertion portion 110, and the distal ends of a plurality of second injection needles 122 are located radially outside the insertion portion 110.
[0057] In some embodiments, when in the unfolded state, the distal ends of a plurality of second injection needles 122 are located radially inside the insertion portion 110, and the distal ends of a plurality of first injection needles 121 are located radially outside the insertion portion 110.
[0058] In some embodiments, when in the unfolded state, the distal ends of the plurality of second injection needles 122 and the distal ends of the plurality of first injection needles 121 are located radially outside the insertion portion 110.
[0059] As shown in Figures 2 and 12, a plurality of first injection needles 121 and / or a plurality of second injection needles 122 are slidably disposed in the injection channel 140, and as the plurality of first injection needles 121 and / or a plurality of second injection needles 122 slide, the plurality of first injection needles 121 and / or a plurality of second injection needles 122 switch between an extended state and a retracted state. In the extended state, the distal ends of the plurality of first injection needles 121 and / or the distal ends of the plurality of second injection needles 122 are located outside the distal end of the injection channel 140; in the retracted state, the distal ends of the plurality of first injection needles 121 and / or the distal ends of the plurality of second injection needles 122 are located inside the injection channel 140.
[0060] When in the retracted state, the distal ends of several first injection needles 121 and / or several second injection needles 122 are all located within the injection channel 140. This prevents the first injection needles 121 and / or second injection needles 122 from damaging human tissue during the insertion of the insertion part 110 into the human cavity. After the insertion part 110 reaches the injection area, the first injection needles 121 and / or several second injection needles 122 move toward the distal ends of the insertion part 110, causing the distal ends of the first injection needles 121 and / or several second injection needles 122 to move to the distal exterior of the injection channel 140, thereby puncturing human tissue.
[0061] It should be noted that the first injection needle 121 and / or the second injection needle 122 are elastic. When the first injection needle 121 and / or the second injection needle 122 are in the retracted state, they deform and store elastic potential energy. When the first injection needle 121 and / or the second injection needle 122 move to the distal outside of the injection channel 140, their deformation returns to normal, switching to the extended state. This causes the distal ends of several first injection needles 121 and / or several distal ends of second injection needles 122 to be located radially outside the insertion portion 110, thereby enabling injection into the injection area.
[0062] In some embodiments, a plurality of first injection needles 121 are slidably disposed in the injection channel 140.
[0063] In some embodiments, a plurality of second injection needles 122 are slidably disposed in the injection channel 140.
[0064] In some embodiments, a plurality of first injection needles 121 and a plurality of second injection needles 122 are slidably disposed in the injection channel 140.
[0065] As shown in Figure 9, the drug injection channel 140 includes a delivery channel 141 and a distribution channel 142. The distal end of the delivery channel 141 is connected to the distribution channel 142. The proximal end of the delivery channel 141 is used to connect to the drug source, and the drug can enter the distribution channel 142 through the delivery channel 141.
[0066] As shown in Figures 9 and 10, the distal end of the distribution channel 142 is connected to a plurality of first injection needles 121 and a plurality of second injection needles 122, for uniformly distributing the medication to all the first injection needles 121 and all the second injection needles 122. The medication entering from the delivery channel 141 flows into the distribution channel 142 and is ultimately discharged through the first injection needles 121 and the second injection needles 122. By setting the distribution channel 142, all the first injection needles 121 and all the second injection needles 122 can receive the same dose of medication, avoiding the problem of uneven dosage, and thus ensuring that the dosage at each injection site 220 of the injection structure 120 is the same during injection.
[0067] In this embodiment, the distribution channel 142 is an annular channel, which ensures that all first injection needles 121 and all second injection needles 122 receive the same dose of medication. The delivery channel 141 can be provided in one, two, three, or more configurations, which can be flexibly configured according to actual usage requirements; this embodiment does not impose any limitations on this.
[0068] In this embodiment, a plurality of first injection needles 121 and / or a plurality of second injection needles 122 are slidably disposed in the distribution channel 142. When in the retracted state, the distal ends of the plurality of first injection needles 121 and / or the distal ends of the plurality of second injection needles 122 are located within the distribution channel 142; when in the extended state, the distal ends of the plurality of first injection needles 121 and / or the distal ends of the plurality of second injection needles 122 are located outside the distribution channel 142.
[0069] Alternatively, as shown in Figures 12 and 13, several first injection needles 121 and several second injection needles 122 are respectively connected to the drug injection channel 140 via injection tubes 160. The proximal end of the injection tube 160 is used to connect to the drug source. The drug can enter the several first injection needles 121 and several second injection needles 122 through multiple injection tubes 160, and be discharged from the several first injection needles 121 and several second injection needles 122. By having several first injection needles 121 and several second injection needles 122 each correspond to one injection tube 160, it can be ensured that all first injection needles 121 and all second injection needles 122 receive the same dose of drug, avoiding the problem of uneven dosage, and thus ensuring that the dosage at each injection site 220 of the injection structure 120 is the same during the injection process.
[0070] In this embodiment, at least a portion of the injection tube 160 can move along the axial direction of the injection channel 152, thereby driving a plurality of first injection needles 121 and / or a plurality of second injection needles 122 to move within the injection channel 152, so that the plurality of first injection needles 121 and / or a plurality of second injection needles 122 switch between an expanded state and a retracted state.
[0071] As shown in Figures 9 and 10, the insertion part 110 includes an insertion tube 111 and a medicine sleeve 112, with the medicine sleeve 112 fitted over the distal end of the insertion tube 111. In this embodiment, a plurality of first injection needles 121 and a plurality of second injection needles 122 are disposed at the distal end of the medicine sleeve 112, and a suction channel 130 is disposed within the insertion tube 111.
[0072] As shown in Figures 9 and 10, the distribution channel 142 is disposed within the medicine sleeve 112, and the delivery channel 141 is disposed within the insertion tube 111 and / or the medicine sleeve 112. Since the distribution channel 142 is an annular channel, and the distal end of the insertion tube 111 also integrates a camera module, it is difficult to fabricate an annular channel within the insertion tube 111. In this embodiment, the medicine sleeve 112 is directly fitted onto the distal end of the insertion tube 111. Fabricating an annular channel directly on the medicine sleeve 112 is much easier than fabricating it on the insertion tube 111 with the integrated camera module, thus reducing the fabrication difficulty.
[0073] In some embodiments, the delivery channel 141 is disposed within the insertion tube 111.
[0074] In some embodiments, the delivery channel 141 is disposed within the medicine sleeve 112.
[0075] Some embodiments of this application also disclose an endoscope 200, as shown in Figures 1, 7 and 14, which includes an endoscope handle 210, an injection section 220 and an injection assembly 100.
[0076] As shown in Figures 1 and 7, the injection unit 220 is located on the instrument mouth of the endoscope handle 210. The proximal ends of the insertion unit 110 and the marking tube 150 extend into the endoscope handle 210 and communicate with the injection unit 220. The injection unit 220 is used to deliver medication to the injection channel 140 and dye to the injection channel 152. During the operation, the insertion unit 110 is inserted into the human cavity, causing several first injection needles 121 and second injection needles 122 to puncture the human tissue. The injection unit 220 delivers medication to the injection channel 140, allowing the medication to enter the human tissue through the first injection needles 121 and second injection needles 122. During the operation, a negative pressure device operates within the suction channel 130 to create negative pressure, drawing and accumulating the human tissue in that area within the suction channel 130. The injection unit 220 delivers dye to the injection channel 152, causing the marking tube 150 to mark the injection area.
[0077] As shown in Figures 7 and 14, the injection unit 220 includes an injection cylinder 221 and a piston 222. The injection cylinder 221 has two chambers 223, one chamber 223 for holding the drug and communicating with the injection channel 140, and the other chamber 223 for holding the dye and communicating with the injection channel 152. By providing two chambers 223 with the injection cylinder 221, both the drug and the dye can be stored simultaneously, eliminating the need for two injection cylinders 221 and saving space.
[0078] In this embodiment, the syringe 221 is divided into two chambers 223 by a partition.
[0079] As shown in Figures 7 and 14, piston 222 is used to drive the drug into injection channel 140 and the dye into injection channel 152. During the operation, the first injection needle 121 and the second injection needle 122 puncture the human tissue. When the human tissue in the injection area is attracted and gathered in the suction channel 130, pressing piston 222 allows the drug to enter injection channel 140 and the dye to enter injection channel 152, ultimately allowing the drug to enter the human tissue and the dye to be marked on the surface of the human tissue.
[0080] In some embodiments, there is one piston 222. When the piston 222 is pressed, the dye enters the injection channel 152 and the drug also enters the drug injection channel 140.
[0081] In some embodiments, there are two pistons 222, each corresponding to one chamber 223. When a drug needs to be injected, the corresponding piston 222 is pressed; when a dye needs to be injected, the corresponding piston 222 is pressed; when both a drug and a dye need to be injected simultaneously, both are pressed at the same time.
[0082] And / or, as shown in Figure 7, the injection unit 220 is slidably connected to the instrument nozzle to drive the injection structure 120 to move axially along the injection channel 140. By moving the injection unit 220, the first injection needle 121 and / or several second injection needles 122 are switched between an extended state and a retracted state.
Claims
1. An injection assembly, characterized in that, include: The insertion section extends from the proximal end to the distal end and has a suction channel and a drug injection channel; The injection channel is used to guide the drug from the proximal end of the injection channel to the distal end of the injection channel for discharge, and the proximal end of the suction channel is used to connect to a negative pressure device; An injection structure for puncturing human tissue includes a plurality of first injection needles; the first injection needles are disposed at the distal end of the insertion portion and communicate with the drug injection channel. A marker tube extends from the proximal end to the distal end and is disposed within the suction channel, with the distal end of the marker tube located within the suction channel for contacting the surface of human tissue. The labeling tube has an injection channel for guiding dye from the proximal end of the injection channel to the distal end of the injection channel for discharge to mark the surface of human tissue. Wherein, the distal end of the marking tube does not extend beyond the distal end of the first injection needle.
2. The injection assembly according to claim 1, characterized in that, There are at least two first injection needles, which are evenly arranged around the circumference of the insertion part; the distal end of the marking tube is fixedly disposed on the inner wall of the suction channel near the axis of the insertion part. And / or, the distal end of the marking tube has a beveled cut, the beveled cut being inclined toward the proximal end of the marking tube from one side where the marking tube is fixed to the suction channel, toward the other side of the marking tube in the radial direction.
3. The injection assembly according to claim 1, characterized in that, The injection structure further includes a plurality of second injection needles; the plurality of second injection needles are disposed at the distal end of the insertion portion and communicate with the drug injection channel. Wherein, the distal end of either the first injection needle or the second injection needle is located outside the distal end of all the other needles.
4. An injection assembly according to claim 3, characterized in that, A plurality of the first injection needles and / or a plurality of the second injection needles are configured to have an extended state and a retracted state; When in the unfolded state, the distal ends of a plurality of the first injection needles and / or the distal ends of a plurality of the second injection needles are located radially outside the insertion portion; When in the retracted state, the distal ends of a plurality of the first injection needles and the distal ends of a plurality of the second injection needles are located radially inside the insertion portion; A plurality of the first injection needles and / or a plurality of the second injection needles may switch between the deployed state and the retracted state.
5. An injection assembly according to claim 4, characterized in that, A plurality of first injection needles and / or a plurality of second injection needles are slidably disposed in the drug injection channel, and as the plurality of first injection needles and / or a plurality of second injection needles slide, the plurality of first injection needles and / or a plurality of second injection needles switch between the unfolded state and the retracted state. When in the deployed state, the distal ends of a plurality of the first injection needles and / or the distal ends of a plurality of the second injection needles are located outside the distal end of the injection channel. When in the retracted state, the distal ends of several first injection needles and / or the distal ends of several second injection needles are located within the injection channel.
6. An injection assembly according to claim 5, characterized in that, The drug delivery channel includes a delivery channel and a distribution channel; the distal end of the delivery channel is connected to the distribution channel, and the distal end of the distribution channel is connected to a plurality of first injection needles and a plurality of second injection needles, for uniformly distributing the drug to all the first injection needles and all the second injection needles; Alternatively, a plurality of the first injection needles and a plurality of the second injection needles may be connected to the drug injection channel via injection tubes.
7. An injection assembly according to claim 6, characterized in that, The insertion part includes an insertion tube and a medicine sleeve; the medicine sleeve is fitted over the distal end of the insertion tube; The distribution channel is disposed inside the medicine sleeve, and the delivery channel is disposed inside the insertion tube and / or the medicine sleeve; The suction channel is located inside the insertion tube.
8. An endoscope, characterized in that, Includes an endoscope handle, an injection unit, and an injection assembly as described in any one of claims 1-7; The injection section is disposed on the instrument mouth of the endoscope handle, and the proximal end of the insertion section and the proximal end of the marking tube extend into the endoscope handle and communicate with the injection section; the injection section is used to deliver a drug into the injection channel and to deliver a dye into the injection channel.
9. An endoscope according to claim 8, characterized in that, The injection unit includes an injection cylinder and a piston; the injection cylinder has two chambers, one of which is used to hold a drug and communicates with the injection channel, and the other chamber is used to hold a dye and communicates with the injection channel; the piston is used to drive the drug into the injection channel and to drive the dye into the injection channel; And / or, the injection unit is slidably connected to the instrument nozzle for driving the injection structure to move axially along the injection channel.