Medical dispensing mechanism using multiple treatment instruments

Abstract

The present invention is a medical dispensing mechanism characterized by comprising: a main body provided with one or more operating handles; a first guide for transmitting the tensile force of the operating handles; a first treatment instrument connected to the end of the first guide; a second guide for transmitting the tensile force of the operating handles; a second treatment instrument connected to the end of the second guide; a double lumen for guiding the first and second treatment instruments into the body, forming a first lumen into which the first guide is inserted and a second lumen into which the second guide is inserted; a single lumen where the first and second treatment instruments intersect and form a distal portion from which either treatment instrument is dispensed; a double-hole bushing provided in the single lumen to limit the maximum forward or backward distance of the first or second treatment instrument; and a single-hole bushing provided in the double lumen to limit the maximum backward distance of the first or second treatment instrument.

Description

Technical Field

[0001] The present invention relates to a medical ejection mechanism used in procedures such as endoscopy, and more particularly to a medical ejection mechanism in which two types of treatment tools are used in combination to improve the operating characteristics during ejection.

Background Art

[0002] The field of endoscopic treatment is an important field in the field of fire extinguisher system diagnosis and treatment. The field of endoscopic treatment has been developed by the miniaturization of electronic devices, the development of video technology, the development of treatment technology, and the proficiency of the skills of medical practitioners since the appearance of ultra-small solid-state imaging devices (CCD: Charge Coupled Device). Conventionally, the treatment of gastric cancer or colorectal cancer has relied on surgical methods, but minimally invasive surgery has become possible by performing endoscopic procedures in parallel. Representative endoscopic surgical methods include endoscopic mucosal resection (EMR: Endoscopic Mucosal Resection) or endoscopic submucosal dissection (ESD: Endoscopic Submucosal Dissection). Such endoscopic procedures use various types of treatment tools depending on treatment purposes such as marking, incision, dissection, hemostasis, and water supply, and the type of mucosa. Various treatment tools are operated through a medical ejection mechanism, inserted into the working channel of the endoscope, and used for the procedure. There is a need to replace the treatment tool during the procedure due to technical operations such as marking, incision, and hemostasis. Conventionally, one treatment tool has been controlled through one medical ejection mechanism. Therefore, conventionally, when it is necessary to replace the treatment tool, there has been an inconvenience that the conventional treatment tool must be removed again and then another treatment tool must be inserted into the working channel of the endoscope.

[0003] The number of working channels in an endoscope is limited, restricting the types of instruments that can be inserted into them. In various endoscopic procedures, where procedures such as marking, incision, dissection, hemostasis, and washing are required, providing medical instruments that allow for diverse procedures to be performed through various instruments without changing the endoscopic channel offers many advantages. For example, a high-frequency knife is a procedure instrument that marks or excises the mucosa by applying high-frequency energy. When working with a high-frequency knife, the ability to immediately control and quickly perform subsequent procedures using needle instruments for water delivery, hemostasis, saline solution, drug injection, etc., in the treatment area is advantageous in terms of ease of procedure, speed of technique, and outcome.

[0004] However, it is not easy to provide a medical dispensing mechanism that can serve two different treatment tools. Figure 1 shows a medical dispensing mechanism that can serve two different treatment tools, disclosed in the applicant's prior patent application, application number 10-2023-0003978 (hereinafter referred to as the "prior patent application"). The aforementioned prior patent application discloses means for solving malfunction problems such as needle detachment, tube damage, or tube rotation when controlling multiple treatment tools independently with a single handle.

[0005] However, a medical dispensing mechanism using two types of treatment tools may have an additional technical issue where a malfunction occurs when dispensing either of the treatment tools. For example, when one of the treatment tools, the first treatment tool, is dispensed, a retraction phenomenon occurs in which the other treatment tool, the second treatment tool, is pushed backward even though it is not in an operating state. This application has discovered that even when the second treatment tool is mechanically locked at the end of the operating handle, the second treatment tool is pushed slightly backward from its designated position when the first treatment tool moves forward. The applicant has confirmed that this phenomenon causes a malfunction in which the second treatment tool is not dispensed sufficiently during cross-drive operations in which the first treatment tool is retracted and the second treatment tool moves forward. Hereinafter, the phenomenon in which a treatment tool is pushed backward due to the reaction force of the system even when the treatment tool is locked and not in an operating state will be referred to as the backflash phenomenon.

[0006] Figure 2 shows a medical dispensing mechanism with an improved drive length for the treatment instrument to cover the backflush phenomenon described above. Figure 2(a) is a conventional medical dispensing mechanism in which a handle stroke of length S1 is formed. Figure 2(b) is an example of a medical dispensing mechanism with an improved drive length in which a handle stroke of length S2 is formed.

[0007] Figure 3 shows an example where malfunctions can still occur even after improving the stroke as shown in Figure 2. Figure 3(a) shows the state of the medical dispensing mechanism before operation, with the needle in the designated standby position P1. Figure 3(b) shows the operation state after dispensing the high-frequency knife, which is the first treatment instrument 10, with the needle, which is the second treatment instrument, retracting P2 from the designated standby position P1, causing a backflush phenomenon. In the state of Figure 3(b), if the stroke is improved to the length shown in Figure 2(b) and the dispensing operation is performed, a malfunction such as tube damage may occur. Figure 3(c) shows an example where the side of the tube was damaged when the needle was dispensed with cross-drive. This is because the needle is pushed backward from the designated position, causing it to enter the side of the tube which is bent when it moves forward.

[0008] Referring to Figure 3, it can be seen that the backflush phenomenon, which causes the needle to retract beyond the designated position, causes not only a problem with the discharge distance but also an additional problem that can damage the side of the distal end of the curved tube.

[0009] In summary, unexpected malfunctions can occur during the process of dispensing multiple instruments crossing through a single tube. In particular, backflushing can occur even if one of the instruments is locked to prevent it from being retracted. Backflushing can occur due to factors such as the reaction force from the tension of the flexible tube during the advancement of other instruments, the degree of bending of the tube, and backflushing in the operating part of the main unit.

[0010] Furthermore, malfunctions can also occur due to the way the medical practitioner uses the device. If the medical practitioner mistakenly pulls the tube from the endoscope or pulls it with excessive force, the tube may stretch. This stretching can cause the bushing, which is positioned to prevent needle detachment, to twist, potentially leading to a serious problem where the needle ruptures the tube when the distal end is bent. This not only compromises the safety of the procedure but also poses a risk of complications such as secondary infection and tissue damage if the tube ruptures inside the patient's body. Therefore, a tube structure should be considered that prevents stretching even under excessive tension in medical dispensing mechanisms, and that the bushing's position is fixed to prevent needle rupture of the tube. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Korean Patent Application No. 10-2023-0003978 [Patent Document 2] Korean Published Patent No. 10-2022-0014413 [Overview of the project] [Problems that the invention aims to solve]

[0012] The present invention aims to provide a medical dispensing mechanism with improved operational characteristics, in which a handpiece is configured to control multiple treatment instruments via a single dispensing mechanism.

[0013] The present invention provides a medical dispensing mechanism applicable to different types of high-frequency knives in which needles can be used simultaneously, and aims to provide a medical dispensing mechanism that prevents malfunctions such as needle detachment, tube damage, or tube rotation in both the IT type (Insulation Type) lumen structure, in which the high-frequency tip is exposed from the lumen, and the Ball type lumen structure, in which the high-frequency tip is housed inside the lumen.

[0014] The present invention aims to provide a medical dispensing mechanism that can prevent damage to the tube by a needle by forming two lumen structures while increasing the inner thickness of the tube, so that the tube does not stretch and the position of the bushing is fixed even if the medical practitioner pulls the tube excessively. [Means for solving the problem]

[0015] The present invention is a medical dispensing mechanism characterized by comprising: a main body provided with one or more operating handles; a first guide for transmitting the tensile force of the operating handles; a first treatment instrument connected to the end of the first guide; a second guide for transmitting the tensile force of the operating handles; a second treatment instrument connected to the end of the second guide; a tube section that guides the first and second treatment instruments into the body and has a double lumen into which the first guide is inserted and a second lumen into which the second guide is inserted; a single lumen into which the first and second treatment instruments intersect and form a distal portion into which either treatment instrument is dispensed; a double-hole bushing provided in the single lumen to limit the maximum forward or backward distance of the first or second treatment instrument; and a single-hole bushing provided in the double lumen to limit the maximum backward distance of the first or second treatment instrument.

[0016] In one embodiment, the first and second treatment tools have a standby position within the inner space of the single lumen for discharge when the operating handle is not driven, and the single-hole bushing can prevent the other treatment tool from moving away from its standby position and retracting when either treatment tool is discharged from the single lumen by driving the operating handle.

[0017] In one embodiment, the double-hole bushing forms a boundary between the double lumen and the single lumen, and when the first treatment instrument and the first guide are connected in the single-lumen region, the second treatment instrument and the second guide are connected in the double-lumen region, and the positions where the treatment instrument and the guide are connected differ with respect to the double-hole bushing as the boundary, so that the first guide can be inserted into the first hole of the double-hole bushing and the second treatment instrument can be inserted into the second hole of the double-hole bushing. In one embodiment, the double-hole bushing can limit the maximum forward distance of the second treatment tool and limit the maximum backward distance of the first treatment tool.

[0018] In one embodiment, the single-hole bushing can limit the maximum retraction distance of the second treatment tool. In one embodiment, the first treatment instrument may be a high-frequency knife, the first guide may be a conductive wire, the second treatment instrument may be a needle, and the second guide may be a needle tube.

[0019] In one embodiment, the double-hole bushing may be formed such that the inner diameter of the first hole is smaller than the outer diameter of the rear end of the first treatment tool, and the inner diameter of the second hole is smaller than the outer diameter of the expanded end of the second guide, which is formed when the rear end of the second treatment tool is inserted and connected to the second guide.

[0020] In one embodiment, the single-hole bushing may be installed by being inserted into the second lumen. In one embodiment, the single-hole bushing has a hole with an inner diameter through which the second guide passes, but the inner diameter of the hole may be formed to be smaller than the outer diameter of the expanded end of the second guide when the rear end of the second treatment tool is inserted into the second guide.

[0021] In one embodiment, the single-hole bushing is inserted into one of the two lumens of the double lumen and is provided in a tapered shape in which the outer diameter of the rear end expands with respect to the direction in which it is inserted during insertion, and can be inserted and fixed in place.

[0022] The present invention also relates to a medical ejection mechanism in which a plurality of treatment instruments are used in combination, comprising: a main body provided with one or more operation handles; a first guide for transmitting the pulling force of the operation handle; a first treatment instrument connected to the end of the first guide; a second guide for transmitting the pulling force of the operation handle; a second treatment instrument connected to the end of the second guide; a double lumen formed by guiding the first treatment instrument and the second treatment instrument into the body and including a first lumen into which the first guide is inserted and a second lumen into which the second guide is inserted; a standby position for driving the first treatment instrument when the operation handle is in a non-driven state, which is formed outside the double lumen exposed from the first lumen, and a standby position for ejecting the second treatment instrument, which is formed inside the double lumen inside the second lumen; a first single-hole bushing provided in the second lumen for limiting the maximum forward movement distance of the second treatment instrument; and a second single-hole bushing provided in the second lumen for limiting the maximum backward movement distance of the second treatment instrument.

[0023] In one embodiment, the first single-hole bushing has a hole with an inner diameter smaller than the outer diameter of the second guide, and the second guide can be engaged to limit the maximum forward movement distance of the second treatment instrument.

[0024] In one embodiment, the second single-hole bushing has a hole with an inner diameter through which the second guide passes, and the inner diameter of the hole can be formed smaller than the outer diameter of the expanded end of the second guide when the rear end of the second treatment instrument is inserted into the second guide.

[0025] In one embodiment, the tube portion forms a single lumen by grooving the distal portion from the tube in which the double lumen is formed, so that the wall thickness of the tube in the distal portion can be formed to be 0.4 mm to 0.65 mm.

[0026] In one embodiment, the medical dispensing mechanism has its rear end connected to a hub formed on the main body, and a tube portion inserted into its front end, but the first and second treatment instruments may further include a hub connector that passes through and is guided to the main body. [Effects of the Invention]

[0027] According to the present invention, the operating characteristics of a medical dispensing mechanism configured to allow multiple treatment instruments to be used in the body of a handpiece and to selectively control the treatment instruments can be improved. The present invention can be applied to both Ball Type dispensing mechanisms with a multi-lumen structure consisting of a single lumen and a double lumen, and IT Type dispensing mechanisms consisting only of a double lumen, and can prevent the backflash phenomenon in which one of the treatment instruments is pushed backward by the reaction force of the system.

[0028] More specifically, according to the present invention, when controlling multiple treatment instruments with a single dispensing mechanism, malfunctions such as instrument detachment, tube damage, or tube rotation are eliminated, thereby improving the convenience, speed, and accuracy of endoscopic procedures for medical professionals.

[0029] Furthermore, by increasing the inner thickness at the distal end of the tube to form a two-lumen structure, the present invention prevents the tube from stretching even if the medical practitioner pulls it excessively, and maintains a fixed position for the bushing. This fundamentally prevents damage to the tube by the needle when the distal end is bent. The present invention eliminates the risk of tube damage by the needle while improving the convenience and safety of the procedure, thereby ensuring both the efficiency of the medical professional and the safety of the patient. [Brief explanation of the drawing]

[0030] [Figure 1] This diagram shows a medical dispensing mechanism that combines two conventional treatment tools. [Figure 2] (a) This figure shows a conventional medical dispensing mechanism as shown in Figure 1. (b) This figure shows a medical dispensing mechanism with an improved handle drive length. [Figure 3] (a) This figure shows the state of a conventional medical dispensing mechanism as shown in Figure 1 before operation, with the needle in the designated standby position P1. (b) This figure shows the operation state of a conventional medical dispensing mechanism as shown in Figure 1, with the high-frequency knife, the first treatment instrument, being dispensed, and the needle, the second treatment instrument, being retracted P2 from the designated standby position P1, causing a backflash phenomenon. (c) This figure shows an example in a conventional medical dispensing mechanism as shown in Figure 2, where the side of the tube was damaged when the needle was dispensed by cross-drive. [Figure 4] This figure shows a medical dispensing mechanism according to an embodiment of the present invention. [Figure 5] (a) This figure shows that the tube portion according to an embodiment of the present invention is formed in a multi-lumen structure. (b) This is a transparent view of the tube portion. [Figure 6] (a) A diagram showing a double-hole bushing according to one embodiment of the present invention. (b) An exploded perspective view of the tube portion to which the double-hole bushing is fastened. [Figure 7] (a) A diagram showing a single-hole bushing according to one embodiment of the present invention. (b) A transparent view of the tube portion to which the single-hole bushing is fastened. [Figure 8] This is an exploded view of a double-lumen medical dispensing mechanism according to another embodiment of the present invention. [Figure 9] This figure shows the hub that is configured in the main body according to an embodiment of the present invention. [Figure 10] This figure shows a hub connector according to an embodiment of the present invention. [Figure 11] This is an exploded cross-sectional view of the main body according to an embodiment of the present invention. [Figure 12] This figure shows a tube portion according to another embodiment of the present invention. [Modes for carrying out the invention]

[0031] The various embodiments described herein are illustrative for the purpose of clearly illustrating the technical ideas of the invention and disclosure, and are not intended to limit them to any particular embodiment. The technical ideas of the invention and disclosure include various modifications, equivalents, alternatives, and embodiments selectively combined from all or part of the embodiments described herein. Furthermore, the scope of rights of the technical ideas of the invention and disclosure is not limited to the embodiments and specific descriptions thereof presented below.

[0032] Terms used in this document, including technical or scientific terms, may have meanings that are generally understood by a person with ordinary skill in the art to which the invention and disclosure pertain, unless otherwise defined. Expressions such as "includes," "may include," "equip," "may possess," and "may possess" used in this document mean that the feature in question is a function, operation, or component, and do not exclude the existence of other additional features. In other words, such expressions should be understood as open-ended terms that imply the possibility of including other embodiments.

[0033] The singular expressions used in this document may imply plural meanings unless otherwise specified in the context, and this also applies to the singular expressions used in the claims.

[0034] Expressions used in this document such as “A, B, and C,” “A, B, or C,” “A, B, and / or C,” or “at least one of A, B, and C,” “at least one of A, B, or C,” “at least one of A, B, and / or C,” “at least one selected from A, B, and C,” “at least one selected from A, B, or C,” and “at least one selected from A, B, and / or C” can mean each listed item or all possible combinations of the listed items. For example, “at least one of A and B” could mean (1) A, (2) at least one of A, (3) B, (4) at least one of B, (5) at least one of A and at least one of B, (6) at least one of A and B, (7) at least one of B and A, or (8) A and B.

[0035] As used in this document, the expression "based on" is used to describe one or more factors that influence the act or action of decision, judgment, or action described in the words or sentences in which the expression is contained, and this expression does not exclude any additional factors that may influence the act or action of decision, judgment, or action.

[0036] In this document, the expression that one component (e.g., component 1) is “connected” or “linked” to another component (e.g., component 2) may mean not only that component 1 is directly connected or linked to the other component, but also that it is connected or linked through a new other component (e.g., component 3).

[0037] The expression "configured to" as used in this document can mean, depending on its component, "to be set up to do something," "to have the ability to do something," "to be modified to do something," "to be made to do something," or "to be able to do something," and is distinct from the meaning of "consist."

[0038] Various embodiments of this disclosure will be described below with reference to the attached drawings. In the attached drawings and the descriptions to which the drawings are attached, identical or substantially equivalent components may be given the same reference numerals. In addition, in the descriptions of the various embodiments below, identical or corresponding components may be omitted from the description, but this does not mean that the component is not included in that embodiment.

[0039] Figure 4 shows a medical dispensing mechanism 1 according to an embodiment of the present invention. Referring to Figure 4, the medical dispensing mechanism 1 may be used in combination with a first treatment tool 10 and a second treatment tool 30, each having different operating characteristics. The medical dispensing mechanism 1 may be provided with an operating module 70 and an operating handle 50 on the body 2 of the handpiece. The operating handle 50 can serve as an operating means for dispensing or retracting the first treatment tool 10 and the second treatment tool 30. In this embodiment, after locking one treatment tool via the operating module 70, the unlocked treatment tool can be driven with the operating handle 50. In other words, the medical dispensing mechanism 1 according to this embodiment may be provided so that two treatment tools can be controlled with a single operating means.

[0040] The main body 2 may be configured with a slider S2 that determines the driving distance of the treatment instrument. The operating handle 50 can move forward or backward by the length of the slider S2. The length of the slider S2 may determine the hand stroke. The driving distance of the slider S2 may be set to a length suitable for dispensing each treatment instrument.

[0041] In the embodiment shown in Figure 4, a medical dispensing mechanism 1 is illustrated in which an ESD knife 10 and a needle 30 are used as multiple treatment tools. The types of treatment tools can be combined in various ways depending on the type of procedure. However, since treatment tools with sharp ends, such as the needle 30, can directly damage the tube in the event of a malfunction, this embodiment describes a case in which the needle 30 is used as one of the multiple treatment tools. The first treatment instrument 10 and the second treatment instrument 30 are connected to the first guide 100 and the second guide 300, respectively. The first guide 100 and the second guide 300 are connected to cylinders located inside the main body 2, and the cylinders can slide via the slider S2. Depending on the characteristics of the treatment instruments, the cylinders of the first treatment instrument 10 and the cylinder of the second treatment instrument 30 may be provided with connecting means to which additional external members are connected. The connecting means of the first treatment instrument 10 may be the first connecting portion 80, and the connecting means of the second treatment instrument 30 may be the second connecting portion 90. In this embodiment, if the first treatment instrument 10 is an ESD knife, the first connecting portion 80 may be a power connector including a power input terminal. If the second treatment instrument 30 is a needle 30, the second connecting portion 90 may be a fluid injector into which a drug solution or the like is injected.

[0042] The main body 2 has a hub 22 configured in the shear direction to which the tube section 20 can be connected. In one embodiment, the tube section 20 may include a protective tube 21, a front tube 200, and a back tube. The back tube may include a single lumen 202 (Figure 5) or a double lumen 201 (Figure 5), and may be a multi-lumen tube in which two types of lumen tubes are used in combination. For the sake of explanation, below, the region of a tube in which two lumens are formed will be referred to as a double lumen, and the region of a tube in which one lumen is formed will be referred to as a single lumen. Furthermore, a tube in which a single lumen and a double lumen are used in combination from the perspective of the tube section 20, and which is configured to be a single lumen in one section and change to a double lumen in another section, will be defined as a multi-lumen tube.

[0043] The type of lumen constituting the tube section 20 can be changed depending on the type of medical dispensing mechanism 1. Types of medical dispensing mechanisms 1 include Insulation Ball Type, Insulation Crescent Type, Ball Type, and Hook Type. Although various types of medical dispensing mechanisms 1 are configured according to the purpose of use and the function of the procedure, in the following embodiment, the Ball Type (hereinafter referred to as Type B) and Insulation Ball Type (hereinafter referred to as Type IT) will be described as representative examples. In the Type B medical dispensing mechanism (Figures 4 to 7), the tube section 20 consists of a multi-lumen tube, while in the Type IT medical dispensing mechanism (Figure 8), the tube 20 may consist of a double lumen and be a single-lumen tube, not a multi-lumen tube.

[0044] Referring to Figure 4, the tip bushing 60 constitutes the dispensing tip from which the first treatment section 10 and the second treatment instrument 30 are dispensed. The medical dispensing mechanism 1 according to this embodiment may further include a double-hole bushing 61 and a single-hole bushing 62 in the tube section 20 in addition to the tip bushing 60. The bushing according to this embodiment can prevent the backflush phenomenon of a certain treatment instrument mentioned in the background art.

[0045] The main body 2 may be provided with one or more operating handles 50. In this embodiment, the main body 2 can control two treatment tools, the first treatment tool 10 and the second treatment tool 30, with a single operating handle 50. This is because the operating module 70 in this embodiment locks and fixes one of the treatment tools, either the first treatment tool 10 or the second treatment tool 30, allowing the unlocked treatment tool to slide along the operating handle 50. In the following drawings, an embodiment is described in which one handle drives both treatment tools as the configuration of the operating module 70, but it is not necessarily limited to this, and two handles may be used on the main body 2 for operating the first treatment tool 10 and the second treatment tool 30, respectively.

[0046] The first guide 100 can transmit the tensile force of the operating handle 50 to the first treatment tool 10. The first treatment tool 10 can be connected to the end of the first guide 100. In this embodiment, the first treatment tool 10 is a high-frequency knife (ESD knife), and the first guide 100 is a conductive wire.

[0047] The second guide 300 can transmit the tensile force of the operating handle 50 to the second treatment tool 30. The second treatment tool 30 can be connected to the end of the second guide 300. In this embodiment, the second treatment tool 30 may be a needle and the second guide 300 may be a needle tube.

[0048] The tube section 20 can guide the first treatment instrument 10 and the second treatment instrument 30 into the body during treatment. A tip bushing 60 is connected to the end of the tube section 20, and the tip bushing 60 can limit the maximum forward distance of the first treatment instrument 10. In the case of the IT type, due to the characteristic of the tip bushing 60 having an insulating coating on the end of the high-frequency knife, the treatment instrument is housed so that it is exposed to the outside of the tip bushing 60. In this case, the tip bushing 60 functions to limit the maximum retraction distance of the IT type high-frequency electrode. On the other hand, in the embodiment of Figure 4, a B type high-frequency electrode is shown as the first treatment instrument 10, and there is a difference in that the B type high-frequency electrode is housed inside the tip bushing 60, so the maximum forward distance is limited.

[0049] In the embodiment shown in Figure 4, the tube portion 20 is formed with a single-lumen structure inside the tip bushing 60. On the other hand, if the high-frequency electrode is of the IT type, the tube portion 20 may have a double-lumen structure inside, which will be described later with reference to Figure 8.

[0050] Figure 5(a) shows that the tube portion 20 according to an embodiment of the present invention is formed in a multi-lumen structure, and Figure 5(b) is a transparent view of the tube portion. The tube portion 20 may include a double lumen 201 and a single lumen 202.

[0051] Referring to Figure 5(a), the tube section 20 is provided such that the distal portion is divided into a single-lumen 202 region and a double-lumen 201 region. The single-lumen 202 and double-lumen 201 can be considered as inner tubes and can be inserted into the outer tube 200 to constitute the tube section 20. The multi-lumen structure may also be formed by inserting the double-lumen 201 into the single-lumen 202. In this case, the tube of the single-lumen 202 will be longer than the tube of the double-lumen 201 into which it is inserted. The region of the single-lumen 202 covering the end of the double-lumen 201 becomes the front end, and the remaining length after the double-lumen 201 tube is inserted can naturally form a single-lumen region.

[0052] The single lumen 202 can form a waiting space where the first treatment instrument 10 and the second treatment instrument 30 are crossed over a single lumen, and either treatment instrument is discharged. This can form the distal portion of the tube section 20.

[0053] Referring to Figure 5(b), the first treatment instrument 10 and the second treatment instrument 30 can have standby positions formed in the inner space of the single lumen 202 for discharge when the operating handle 50 is not driven.

[0054] The double-hole bushing 61 is provided in the single lumen 202 and can limit the maximum forward or backward distance of the first treatment instrument 10 or the second treatment instrument 30. The double-hole bushing 61 can also form a boundary between the double lumen 201 and the single lumen 202. The boundary formed by the double-hole bushing 61 connects the first treatment instrument 10 and the first guide 100 in the single lumen 202 region, while the second guide 300 of the second treatment instrument 30 can be connected in the double lumen 201 region.

[0055] Figure 6(a) shows a double-hole bushing 61 according to one embodiment of the present invention, and Figure 6(b) is an exploded perspective view of the tube portion to which the double-hole bushing 61 is fastened. As can be seen in Figure 5, the positions in which the treatment tool and the guide are connected differ with the double-hole bushing 61 as the boundary, so that the first guide 100 can be inserted into the first hole 611 of the double-hole bushing 61, and the second treatment tool 30 can be inserted into the second hole 612 of the double-hole bushing 61.

[0056] The double-hole bushing 61 may be formed so that the inner diameter of the first hole 611 is smaller than the outer diameter of the rear end of the first treatment tool 10. The inner diameter of the second hole 612 may be formed smaller than the outer diameter of the end 301 of the second guide 300. The inner diameter of the second hole 612 may be formed smaller than the outer diameter of the expanded end 301 of the needle tube 300 or the outer diameter of the needle tube 300. The needle 30 is connected to the connector 33, which is inserted into the needle tube 300. Typically, the end of the needle tube 300 is expanded by heat treatment or other means before the connector 33 is inserted and crimped, so that the end 301 is formed larger than the outer diameter of the needle tube 300. Since the second guide 300 is located to the right (reference to Figure 5) with respect to the double-hole bushing 61, the end 301 may overlap the second hole 612, limiting the maximum forward distance of the second treatment tool 30.

[0057] In the double-hole bushing 61, the first guide 100 passes through the first hole 611 to the left side (reference to Figure 5) and is connected to the first treatment tool 10. As a result, the outer diameter of the rear end of the first treatment tool 10 overlaps the first hole 611 in the direction of the front end of the tube. Therefore, the first hole 611 can limit the maximum retraction distance of the first treatment tool 10.

[0058] Figure 7(a) shows a single-hole bushing 62 according to one embodiment of the present invention, and Figure 7(b) is a transparent view of the tube portion 200 to which the single-hole bushing 62 is fastened.

[0059] The single-hole bushing 62 is provided in the double lumen 201 and can limit the maximum retraction distance of the first treatment instrument 10 or the second treatment instrument 30. Here, the treatment instrument whose maximum retraction distance is limited by the single-hole bushing 62 may be the treatment instrument whose maximum forward distance is limited by the double-hole bushing 61. In previous embodiments, the second treatment instrument 30 is a needle and its maximum forward distance is limited by the double-hole bushing 61, so in this embodiment, the treatment instrument whose maximum retraction distance is limited by the single-hole bushing 62 may be the second treatment instrument 30.

[0060] The single-hole bushing 62 can prevent other instruments from unintentionally moving away from their standby position and retracting when one instrument is ejected from the single lumen 202 by the operation of the operating handle 50. A single-hole bushing 62 can be inserted into the second lumen 2012. In the tube 20, the single-hole bushing 62 is located behind the double-hole bushing 61. The single-hole bushing 62 may have a hole 621 with an inner diameter through which the second guide 300 passes. The inner diameter of the hole 621 may be smaller than the outer diameter of the expanded end 301 of the second guide 300, which is inserted into the second guide 300 by the rear end of the second treatment instrument 30. In other words, the second guide 300 has a step at its end that is expanded beyond the tube, and the inner diameter of the hole 621 may be such that the tube 300 passes through but the end 301 of the tube does not.

[0061] A single-hole bushing 62 can be inserted into one of the two lumens 2012 of a double lumen 201. The single-hole bushing 62 can be inserted and fixed in place by being provided in a tapered shape, with the outer diameter 620 at the rear end expanding relative to the direction of insertion during insertion. In one embodiment, the single-hole bushing 62 can be provided in an hourglass shape, with the outer diameter expanding outward relative to the center. The single-hole bushing 62 can be inserted into the appropriate position in the expanded lumen, and once the inner diameter of the lumen is restored, it can be naturally fixed in place by the tapered fixing portions 620 on both sides. The single-hole bushing 62 according to this embodiment can prevent the treatment instrument 20 from retracting due to the backflush phenomenon described above.

[0062] Figure 8 shows a tube section 20 in which a double lumen 201 is formed in a medical dispensing mechanism 1 according to another embodiment of the present invention. The medical dispensing mechanism 1 according to the embodiment in Figure 8 exemplifies an IT-type high-frequency treatment instrument. Referring to Figure 8, in the IT-type medical dispensing mechanism 1, the double lumen 201 may constitute the distal end of the tube section 20 without a single-lumen region. The medical dispensing mechanism 1 according to this embodiment may include a first single-hole bushing 63 and a second single-hole bushing 62 in the tube section 20.

[0063] In this embodiment, when the operating handle 50 is not driven, the first treatment tool 10 may have a standby position for being driven outside the double lumen 201 exposed from the first lumen 2011. Conversely, the second treatment tool 30 may have a standby position for dispensing inside the double lumen 201, which is inside the second lumen 2012.

[0064] In one embodiment, the first and second single-hole bushings 63 and 62 may both be hourglass-shaped, with their outer diameters expanding outwards from the center. The first and second single-hole bushings 63 and 62 can both be structurally shaped to be inserted onto the lumen and pressurized for fixation.

[0065] The first single-hole bushing 63 is provided in the second lumen 2012 and can limit the maximum forward distance of the second treatment instrument 30. The first single-hole bushing 63 has a hole with an inner diameter smaller than the outer diameter of the second guide 300, and can limit the maximum forward distance of the second treatment instrument 30 by engaging with the second guide 300 or the end 301 of the second guide 300.

[0066] The second single-hole bushing 62 is provided in the second lumen 2012 and can limit the maximum retraction distance of the second treatment instrument 30. The second single-hole bushing 62 has a hole with an inner diameter through which the second guide 300 can pass, but the inner diameter of the hole can be made smaller than the outer diameter of the expanded end 301 of the second guide 300 when the rear end of the second treatment instrument 30 is inserted into the second guide 300. In other words, the inner diameter of the second single-hole bushing 62 can be made larger than the tube 300 of the second guide 300 and smaller than the end 301 of the second guide 300.

[0067] Figure 9 shows the hub 22 that is configured in the main body 2 according to an embodiment of the present invention. In this embodiment, the protective tube 21 is shorter in length than the outer tube 202 and is partially formed in the proximal portion where the hub 22 is provided, so that it can be inserted into and fixed to the hub 22. The protective tube 21 can protect the tube portion 20 from external forces such as bending or pressing.

[0068] A hub connector 40 may be included within the hub 22. The rear end of the hub connector 40 is connected to the hub 22, and the front end into which the tube portion 20 is inserted. The first guide 100 and the second guide 300, which are inserted inside the tube portion 20, can be guided inside the main body 2 by passing through and via the hub connector 40. At the bottom of Figure 9, the protective tube 21 is not shown, and the hub connector 40 connected to the tube portion 20 and the hub 22 are shown together in a transparent view.

[0069] In this embodiment, the hub connector 40 can be bonded and fixed to the hub 22. Medical dispensing mechanisms used in ESD and EMR procedures generate heat from the knife electrodes and wires, so heat-resistant tubing should be used. The material used for heat-resistant tubing is mainly teplon (PTFE), which cannot be bonded with cyanoacrylate-based adhesives. The tubing portion 20 cannot be directly bonded to the hub 22 and should be fixed by pressurized insertion. The pressurized fixing method of the tubing is sufficient to firmly fix the tubing so that it does not come out. However, the pressurized fixing method has the limitation that the rotational fixing force is reduced. In particular, if the handpiece is used repeatedly, the tubing may twist during the operation of the handpiece and rotation, which can lead to malfunction. In this embodiment, the hub connector 40 is presented as a fixing means to fix the tubing portion 20 to the hub 22 so that it does not twist or rotate even when conventional pressurized insertion fixing is performed without adhesive fixing of the tubing portion 20 by bonding.

[0070] One end of the hub connector 40 is bonded and fixed to the hub 22, and the tube portion 20 is inserted and fixed to both the hub connector 40 and the hub 22. An embodiment of the hub connector 40 will be described in detail below.

[0071] Figure 10 shows a hub connector according to an embodiment of the present invention. Figure 10 shows how the hub connector 40 is connected to the hub 22 according to an embodiment of the present invention. The hub connector 40 is divided into a rear end 41, a main body 42, and a front end 43. The hub connector 40 can be provided in a cylindrical shape so that it can be connected to either the fastening portion of the hub 22 or the tube.

[0072] Figure 10 shows the first guide 100 and the second guide 300 inserted into the inner tubes 201 and 202, while the inner tubes 201 and 202 and the outer tube 200 are omitted from the illustration.

[0073] The hub connector 40 may have hollows 401 and 403 through which the first guide 100 and the second guide 300 pass, respectively. The hub connector 40 may have a sleeve 43 formed where one of the hollows is extended to a longer length, and the sleeve 43 may define the tip.

[0074] The hub connector 40 has hollows 401 and 403 formed with different inner diameters through which the first guide 100 and the second guide 300 pass, respectively, and a sleeve 43 may be formed in the hollow 403 with the larger inner diameter among the multiple hollows 401 and 403.

[0075] The hub connector 40 has a back tube 201 inserted into its tip 43, and the front tube 202 is inserted so as to enclose the outer surface of the hub connector 40 so that the hub connector 40 is inserted into it. In this embodiment, the back tube 201 is double-lumen, and the sleeve 43 may be inserted into the lumen of the back tube 201 into which the needle is inserted. To summarize the embodiment in which the back tube 201 is inserted and coupled with the hub connector 40, it should be considered that the outer diameters of the wires inserted into the tube portion 20 of the first guide 100 and the second guide 300 may be different from each other. Generally, in the case of a high-frequency knife, the outer diameter of the wire is thin because the instrument is guided by a metal wire. On the other hand, in the case of a needle, the outer diameter of the needle tube is formed to be thicker because the instrument is guided by a needle tube into which sterile water or drugs are injected. As a result, the lumens of the back tube 201, which houses the needle and the high-frequency knife in a double-lumen configuration, may be formed to have different inner diameters.

[0076] In this embodiment, a wire with a small outer diameter, such as a high-frequency knife wire, is inserted into the hollow 401 with a small inner diameter of the hub connector 40. A wire with a large outer diameter, such as a needle tube, is inserted into the hollow 403 with a large inner diameter of the hub connector. Of these, a sleeve 43 is formed in the hollow 403 with the larger inner diameter to extend the length of the hollow. As the treatment instruments are inserted into the hollows 401 and 403 under the above conditions, the sleeve 43 can be inserted into the lumen of the back tube 201 into which the needle tube is inserted. On the other hand, the end of the lumen of the back tube 201 into which the knife wire is inserted abuts against the main body 42 at the position of the hollow 401. In this embodiment, the back tube 201 is provided so as not to be larger than the inner diameter of the main body 42 and can be fixed in a state where it is inserted into the sleeve 43, which is the tip. In other words, only one of the two lumens of the back tube 201 can be inserted into the sleeve 43.

[0077] On the other hand, the front tube 200 can be inserted into the body 42 of the hub connector 40. The front tube 200 is single-lumen, and its inner diameter can correspond to the outer diameter of the body 42. The front tube 200 can be inserted over the entire hub connector 40, with the back tube 201 inserted into the sleeve 43.

[0078] The function of the hub connector 40 can be explained as follows based on this coupling relationship. The hub connector 40 can be fixed by adhesive bonding with its rear end 41 inserted into the fastening portion of the hub 22. The rear end 41 may be inserted inward into the front end of the hub 22, or the front end may be inserted into the rear end 41 and bonded. The body 42 holds the first guide 100 and the second guide 300, so that when rotation or twisting occurs from the hub 22, the rotational force is directly transmitted to the first treatment tool 10 and the second treatment tool 30 via the guides. The rotational or torsional force transmitted directly to the first guide 100 and the second guide 300 is transmitted to the lumen of the back tube 201. Thus, as the hub connector 40 fixed to the hub 22 rotates, the same rotational force is transmitted to the back tube 201. This prevents torsional momentum from acting only on the front tube 200 which encloses and inserts the body 42 of the hub connector 40, thus preventing rotation from occurring relatively. Ultimately, if the hub 22 twists or rotates, the hub connector 40 also rotates in the same way, and the force is transmitted so that both the inner tube 201 and the outer tube 200 rotate in the same way, preventing the tube section 20 from twisting away from the hub 22.

[0079] Figure 11 is an exploded cross-sectional view of the main body 2 according to an embodiment of the present invention. Figure 11 shows the configuration of an operating module 70 that enables selective locking of the first and second treatment instruments 10 and 30. In this embodiment, the main body 2 may include a first cylinder 800, a second cylinder 900, and a fixing pin 77. The fixing pin 77 moves vertically in a designated groove. A first coupling portion 80 may be formed on the first cylinder 800, and a second coupling portion 90 may be formed on the second cylinder 900. The first cylinder 800 and the second cylinder 900 can slide a distance S2.

[0080] Referring to Figure 11, the first guide 100 is fixedly connected to the first cylinder 800. The second guide 300 is fixedly connected to the second cylinder 900. The operating handle 50 can pressurize and push out the operating module 70, which then engages with one of the members of either the first cylinder 800 or the second cylinder 900. In this embodiment, when the operating module 70 is toggled downward with reference to Figure 11, the fixing pin 77 is pushed down to lock the second cylinder 900. The operating module 70 then engages with the first cylinder 800 and moves forward together with the forward movement of the operating handle. For other detailed embodiments, refer to the embodiments in the applicant's prior publication patent No. 2023-0038148.

[0081] Figure 12 shows a tube section 20' according to another embodiment of the present invention. The tube section 20' can be divided at A into a double lumen 2011', 2012' region and a single lumen 202' region. The tube section 20' can be manufactured from a single integrated double lumen. In this case, it is distinguished from previous embodiments in which the double lumen and single lumen were constructed with a double tube structure consisting of a back tube and a front tube. In this embodiment, the distal end from A onwards is formed into a single lumen 202' in a double lumen having a first lumen 2011' and a second lumen 2012'. As an example, the distal end is broken down to the region of A by drilling to form the two lumens into one lumen. The tube section 20' according to this embodiment is not limited to the above manufacturing embodiment, but can be applied as long as it is possible to partially form two lumens and one lumen from a single tube. In this case, it is preferable that the inner thickness of the double lumen tube is formed to be 0.4 mm to 0.65 mm. The inner thickness may refer to the thickness of the tube wall. According to this embodiment, the tube portion 20' is formed by grooving the distal portion of the tube from which the double lumen is formed to form a single lumen, thereby enabling the thickness of the distal tube wall to be 0.4 mm to 0.65 mm.

[0082] While the technical concept of the present invention and its disclosure has been explained by the embodiments described herein, the technical concept of the present invention may include a variety of substitutions, modifications, and alterations that can be understood by a person with ordinary skill in the art to which the present invention pertains. Furthermore, such substitutions, modifications, and alterations may be understood to be included within the scope of the attached claims. [Explanation of Symbols]

[0083] 1: Medical dispensing mechanism 10: First treatment instrument 100: Guide 1 30: Second treatment instrument 300: Guide 2 301: Terminal 2: Main unit 20: Tube section 21: Protective tube 200: Surface tube 201: Double Lumens 2011: Lumen 1 2012: Second lumen 202: Single Lumen 22: Hub 33: Connector 40: Hub connector 41: Rear end 42: Main unit 43: Tip 401, 403: Hollow 50: Operating handle 60: Tip Bushing 61: Double-hole bushing 611: 1st hole 612:Second hole 62, 63: Single-hole bushing 620:Fixed part 621: Hole 70: Operation Module 77: Fixing pin 80: 1st connection part 800: First cylinder 90:Second connection part 900: Second cylinder

Claims

1. In a medical dispensing mechanism in which multiple treatment instruments are used in combination, A main body having one or more operating handles, A first guide that transmits the tensile force of the operating handle, and a first treatment tool connected to the end of the first guide, A second guide that transmits the tensile force of the operating handle, and a second treatment tool connected to the end of the second guide, The first treatment device and the second treatment device are guided into the body, A tube section having a double lumen formed by a first lumen into which the first guide is inserted and a second lumen into which the second guide is inserted, and a single lumen formed by the intersection of the first and second treatment instruments and the distal portion from which either treatment instrument is discharged, A double-hole bushing provided in the single lumen limits the maximum forward or backward distance of the first or second treatment tool, The double lumen includes a single-hole bushing that limits the maximum retraction distance of the first or second treatment instrument, The first treatment instrument and the second treatment instrument are, A medical dispensing mechanism characterized in that the standby position for dispensing when the operating handle is not driven is the inner space of the single lumen.

2. The single-hole bushing is, The medical dispensing mechanism according to claim 1, characterized in that when one of the treatment instruments is dispensed from the single lumen by driving the aforementioned operating handle, the other treatment instruments are prevented from being released from their standby position and retracted.

3. The double-hole bushing described above is The boundary between the double lumen and the single lumen is formed, When the first treatment instrument and the first guide are connected in the single-lumen region, the second treatment instrument and the second guide are connected in the double-lumen region. The medical dispensing mechanism according to claim 1, characterized in that the first guide is inserted into the first hole of the double-hole bushing, and the second treatment instrument is inserted into the second hole of the double-hole bushing, and the positions of connection between the treatment instrument and the guide are different with the double-hole bushing as the boundary.

4. The double-hole bushing described above is The maximum forward distance of the second treatment tool is limited, The medical dispensing mechanism according to claim 3, characterized in that it limits the maximum retraction distance of the first treatment instrument.

5. The single-hole bushing is, The medical dispensing mechanism according to claim 3, characterized in that it limits the maximum retraction distance of the second treatment instrument.

6. The first treatment instrument is a high-frequency knife, and the first guide is a conductive wire. The medical dispensing mechanism according to claim 3, characterized in that the second treatment instrument is a needle and the second guide is a needle tube.

7. The double-hole bushing described above is The inner diameter of the first hole is formed to be smaller than the outer diameter of the rear end of the first treatment tool. The medical dispensing mechanism according to claim 3, characterized in that the inner diameter of the second hole is formed to be smaller than the outer diameter of the end of the second guide.

8. The single-hole bushing is, The medical dispensing mechanism according to claim 3, characterized in that it is inserted into the second lumen.

9. The single-hole bushing is, A hole with an inner diameter is formed through which the second guide passes, The rear end of the second treatment instrument is inserted into the second guide, thereby expanding the end of the second guide. The medical dispensing mechanism according to claim 8, characterized in that the inner diameter of the hole is formed to be smaller than the outer diameter of the expanded end of the second guide.

10. The single-hole bushing is, It is inserted into one of the two lumens of the double lumen, The medical dispensing mechanism according to claim 1, characterized in that the outer diameter of the rear end is tapered, expanding with respect to the direction in which the tube is inserted during insertion, and is inserted and fixed in place.

11. The aforementioned tube portion is The medical dispensing mechanism according to claim 1, characterized in that the distal portion of the tube in which the double lumen is formed is grooved to form the single lumen, thereby forming the thickness of the tube wall in the distal portion to 0.4 mm to 0.65 mm.

12. The rear end is connected to the hub that makes up the main body, and the tube portion is inserted into the front end. The medical dispensing mechanism according to claim 1, further comprising a hub connector through which the first and second treatment instruments are guided to the main body.

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