Limiting Device and Method for Using Same

Abstract

The limiting device includes a clamping portion and a movable portion; the clamping portion and the movable portion are both annular structures, two ends of the clamping portion and the movable portion are respectively connected to form a connected double-ring structure, and the ring diameter of the movable portion is larger than that of the clamping portion. The limiting device is disposed on a core rod, the clamping portion and the core rod are in interference fit, and the movable portion and the core rod are in clearance fit. When the movable portion cooperates with the core rod, the limiting device may slide relative to the core rod; when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device cannot slide relative to the core rod, thus achieving the purpose of limiting.

Claims

1. A limiting device, wherein the limiting device comprises a clamping portion and a movable portion, wherein the clamping portion and the movable portion are both of a ring structure, two ends of the clamping portion in a ring structure and two ends of the movable portion in a ring structure are connected, respectively, forming a connected double-ring structure; a ring diameter of the movable portion is greater than a ring diameter of the clamping portion; and the limiting device is provided on a core rod, the clamping portion and the core rod are in an interference fit, and the movable portion and the core rod are in a clearance fit, wherein when the movable portion cooperates with the core rod, the limiting device is slidable with respect to the core rod, and when the clamping portion cooperates with the core rod, the limiting device and the core rod are in a fixed state, and the limiting device is immovable with respect to the core rod, thus achieving a position limiting purpose.

2. The limiting device according to claim 1, wherein the core rod is further provided with a slider, wherein when the slider moves to a designated position, to enable the clamping portion to cooperate with the core rod, the limiting device and the core rod are in a fixed state, so that the limiting device limits movement of the slider.

3. The limiting device according to claim 1, wherein when the clamping portion and the movable portion cooperate with the core rod, an area of the core rod wrapped by each of the clamping portion and the movable portion is greater than half of a ring area of the core rod.

4. The limiting device according to claim 1, wherein the clamping portion is provided with a pressing plate, and the core rod is provided with a groove cooperating with the pressing plate.

5. The limiting device according to claim 4, wherein the pressing plate is of a fork shape or a zigzag shape.

6. The limiting device according to claim 4, wherein a depth of the groove is greater than a length of the pressing plate.

7. The limiting device according to claim 6, wherein when the movable portion cooperates with the core rod, the limiting device is in a non-clamping state, and only end portions of the pressing plate are in contact with the groove of the core rod; and when the clamping portion cooperates with the core rod, the limiting device is in a clamping state, the pressing plate is mostly or completely pressed into the groove of the core rod, and the limiting device is immovable with respect to the core rod.

8. The limiting device according to claim 1, wherein the clamping portion and the movable portion are integrally molded or separately molded.

9. The limiting device according to claim 1, wherein the ring structure of each of the clamping portion and the movable portion is a C-shaped structure.

10. The limiting device according to claim 1, wherein the limiting device is made of plastic.

11. Method for using the limiting device according to claim 1, wherein when the limiting device is in a non-clamping state, the limiting device is slid to a designated portion; the clamping portion of the limiting device is pressed, so that the clamping portion of the limiting device cooperates with the core rod, and at this time, the limiting device is in a clamping state; and after a position limiting is completed, the movable portion of the limiting device is pressed, so that the movable portion of the limiting device cooperates with the core rod, the limiting device is again in the non-clamping state, avoiding the core rod and the limiting device from being in the clamping state for a long period of time and deformed due to stress to cause the limiting device to become loose.

12. The limiting device according to claim 2, wherein the limiting device is made of plastic.

13. The limiting device according to claim 3, wherein the limiting device is made of plastic.

14. The limiting device according to claim 4, wherein the limiting device is made of plastic.

15. The limiting device according to claim 5, wherein the limiting device is made of plastic.

16. The limiting device according to claim 6, wherein the limiting device is made of plastic.

17. The limiting device according to claim 7, wherein the limiting device is made of plastic.

18. The limiting device according to claim 8, wherein the limiting device is made of plastic.

19. The limiting device according to claim 9, wherein the limiting device is made of plastic.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a schematic view of a limiting device of the present disclosure;

[0024] FIG. 2a is a schematic view of the limiting device of the present disclosure in a non-clamping state;

[0025] FIG. 2b is a sectional view of the limiting device of the present disclosure in the non-clamping state at a place A-A of a core rod;

[0026] FIG. 3a is a schematic view of the limiting device of the present disclosure in a clamping state; and

[0027] FIG. 3b is a sectional view of the limiting device of the present disclosure in the clamping state at the place A-A of the core rod.

ILLUSTRATION OF REFERENCE SIGNS

[0028]

TABLE-US-00001 1 core rod 2 slider 3 limiting device 3-a clamping portion 3-b movable portion 4 pressing plate

DETAILED DESCRIPTION OF EMBODIMENTS

[0029] In order to make the objectives, the technical solutions and advantages of the present disclosure clearer, the present disclosure is further described in detail below in combination with the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely used to illustrate the present disclosure, rather than limiting the present disclosure. The scope of the present disclosure is not limited by these embodiments, but is determined by the scope of the patent of the present disclosure. In order to provide clearer description and enable one of ordinary skill in the art to understand the filed contents of the present disclosure, various parts within the drawings are not necessarily drawn to scale relative to each other, the ratio of certain dimensions to other related dimensions may be highlighted and exaggerated, and irrelevant or unimportant details may not be fully drawn for clarity of illustration.

[0030] FIG. 1 to FIG. 3b are schematic views of a limiting device of the present disclosure, and schematic views of the limiting device in a clamping state and a non-clamping state when cooperating with a core rod. The limiting device 3 in the present disclosure includes a clamping portion 3-a and a movable portion 3-b. The clamping portion 3-a and the movable portion 3-b may be shaped as required, and may be respectively in a ring structure. Two ends of the clamping portion 3-a in a ring structure are respectively connected to two ends of the movable portion 3-b in a ring structure, thus forming a connected double-ring structure. In the present embodiment, the ring structures of the clamping portion and the movable portion are C-shaped structures, and two ends of the C-shaped structures of the clamping portion and the movable portion are respectively connected to each other to form the connected double-ring structure. In the above, a ring diameter of the movable portion 3-b is greater than a ring diameter of the clamping portion 3-a, and the clamping portion 3-a may cooperate with a core rod 1 to realize a limiting function of a slider 2. The slider 2 and the core rod 1 may be shaped as required. In the present embodiment, the slider 2 may be a ring-shaped slider, the core rod 1 may be in a cylindrical shape, and the slider 2 may slide on the core rod 1. The clamping portion 3-a and the core rod 1 are in an interference fit, and the movable portion 3-b and the core rod 1 are in a clearance fit. The limiting device 3 and the slider 2 are respectively arranged on the core rod 1. When the limiting device 3 does not need to limit the movement of the slider 2, the movable portion 3-b cooperates with the core rod 1, as the movable portion 3-b and the core rod 1 are in a clearance fit, at this time, the clamping portion 3-a and the core rod 1 are not in pressure contact, and even if after long-time placement, the clamping portion 3-a still will not be deformed to affect the clamping effect, thus greatly prolonging the service life of the limiting device 3, moreover, the limiting device 3 may smoothly slide on the core rod 1, when the slider 2 needs to be positioned, the slider 2 is slid to be brought into a designated position, then, the limiting device 3 is slid so that it is moved to a designated position. During this positioning process, as the movable portion 3-b and the core rod 1 are in a clearance fit, the limiting device 3 may slide freely on the core rod 1, to complete the positioning operation, thus the operation is simpler; when the limiting device 3 moves to the designated position, the clamping portion 3-a is pressed so that the clamping portion 3-a cooperates with the core rod 1. As the clamping portion 3-a and the core rod 1 of the handle are in an interference fit, the limiting device 3 cannot slide along the core rod 1, thereby achieving a position limiting effect, at this time, the ring slider 2 of the handle is fixed at this position, and can no longer move, thereby achieving the purpose of stopping through the ring slider 2. In order to achieve a better clamping effect, when the movable portion 3-b in the limiting device 3 cooperates with the core rod 1, an area of the core rod 1 wrapped by the movable portion 3-b is greater than half of a ring area of the core rod 1, and the limiting device 3 will not slide off the core rod 1; and when the clamping portion 3-a in the limiting device 3 cooperates with the core rod 1, the area of the core rod 1 wrapped by the clamping portion 3-a is greater than half of the ring area of the core rod 1, and a better fixing effect may be achieved.

[0031] In order to achieve a better stopping and position limiting effect, a fixing pressure of the limiting device 3 at a designated position is increased. In the present disclosure, a fork-shaped pressing plate 4 further may be provided in the ring of the clamping portion 3-a, and a groove that may cooperate with the fork-shaped pressing plate 4 is provided on the core rod 1, and the groove may cooperate with the fork-shaped pressing plate 4 to increase the fixing pressure of the limiting device 3 at the designated position. Specifically, when the movable portion 3-b cooperates with the core rod 1, only end portions of the fork-shaped pressing plate 4 are in contact with an edge of the groove of the core rod 1, and at this time, no pressure will be generated between the fork-shaped pressing plate 4 and the groove of the core rod 1, the fixing force of the fork-shaped pressing plate 4 will not be affected after long-time placement, thus functioning to fix the position during the sliding process of the limiting device, and preventing a sliding portion from inclining during the moving process; and when the clamping portion 3-a cooperates with the core rod 1, the fork-shaped pressing plate 4 may be mostly or completely pressed into the groove of the core rod 1. At this time, an extruding force between the fork-shaped pressing plate 4 and the groove of the core rod will increase the fixing force of the limiting device 3, and improve the positioning effect between the limiting device 3 and the core rod 1. In order to achieve a better clamping effect, the length of the pressing plate 4 may be greater than half of the depth of the groove and less than the depth of the groove. In the present disclosure, the shape of the pressing plate 4 is a fork shape, which is not limited herein. The pressing plate includes two or more teeth, and the teeth have a gap therebetween, and can be deformed correspondingly so that they are pressed into the groove of the core rod 1, with a contact surface between the pressing plate and the groove of the core rod 1 being in an arc shape, and the fixing effect is achieved. Apart from the fork shape in the present embodiment, the pressing plate may also be of a zigzag shape or other shapes.

[0032] In the present disclosure, the movable portion 3-b and the clamping portion 3-a in the limiting device 3 may be integrally formed or separately manufactured. An advantage of using a separately manufactured structure is that when the movable portion 3-b or the clamping portion 3-a fails, the failed part may be disassembled and then replaced, without affecting the use of other parts, thereby facilitating the operation. When the movable portion 3-b and the clamping portion 3-a in the limiting device 3 adopt discrete structures, the movable portion 3-b and the clamping portion 3-a may be fixed by glue, hook, or the like, or may be fixed in a plurality of mixed manners.

[0033] In the present disclosure, the material of the limiting device 3 is plastic, and the limiting device 3 is formed by injection molding. The plastic herein may be ABS, PC or other plastic materials, and may also be a mixed material composed of a plurality of plastic raw materials. The selected material should have good dimensional stability, and have certain toughness and rigidity.

[0034] FIG. 2a and FIG. 3a respectively show schematic views of the limiting device 3 of the present disclosure, when cooperating with the core rod 1, in a clamping state and a non-clamping state, and FIG. 2b and FIG. 3b respectively show sectional views of the limiting device 3 of the present disclosure at a place A-A of the core rod, when cooperating with the core rod 1 in a clamping state and a non-clamping state. As shown in FIG. 2b, at this time, the limiting device 3 is in a non-clamping state, and the movable portion 3-b in the limiting device cooperates with the core rod 1, and the area of the core rod 1 wrapped by the movable portion is greater than half of the ring area of the core rod, moreover, as the movable portion 3-b and the core rod 1 are in a clearance fit, the limiting device 3 may slide freely on the core rod 1. When the instrument is in an unused state, the limiting device 3 is in a non-clamping state, so that no pressure will be generated on the limiting device 3, and the limiting device will not be deformed even after long-time placement; when the instrument is in a use state and the position of the limiting device 3 needs to be adjusted, the limiting device 3 only needs to be pushed to a designated position, which facilitates operation and reduces the risk of wear fatigue of the limiting device 3. As shown in FIG. 3b, at this time, the limiting device 3 is in a clamping state, at this time, the clamping portion 3-a in the limiting device 3 cooperates with the core rod 1, the pressing plate 4 in the clamping portion 3-a is mostly or completely pressed into the groove of the core rod 1. As the clamping portion 3-a and the core rod 1, and the pressing plate 4 and the groove of the core rod 1 are in an interference fit, respectively, there is a large clamping force between the limiting device 3 and the core rod 1 at this time, then the limiting device 3 cannot slide along the core rod 1 of the handle, thus achieving the purpose of limiting the movement of the slider 2.

[0035] The main function of the present disclosure in the ERCP is as follows: after a papillotome reaches a designated position, the doctor pulls the ring slider on the handle, so that cutting wire at a distal end of the papillotome is adjusted to be in a bow shape suitable for incising papilla. At this time, the movable portion in the limiting device and the core rod are in a clearance fit state, the limiting device is slid to a front end of the ring slider, and presses the clamping portion of the limiting device, so that the clamping portion in the limiting device cooperates with the core rod of the handle. At this time, as the clamping portion and the core rod of the handle are in an interference fit, the limiting device will be in a clamping state, it cannot slide along the core rod of the handle, then having a limiting function to the ring slider; when there is no need to limit the position, the movable portion of the limiting device is pressed, so that the movable portion cooperates with the core rod of the handle, thereby avoiding the clamping force of the limiting device from being reduced when the limiting device is in the clamping state for a long time, thereby the limiting function cannot be realized.

[0036] The limiting device provided in the present disclosure can realize the function of fast moving and positioning, and still can maintain a very good limiting function after long-time placement, thus prolonging the service life of the medical device.

[0037] The above-mentioned are merely preferred embodiments of the present disclosure, but do not limit the present disclosure in any form. Although the present disclosure has been disclosed in the above with preferred embodiments, the present disclosure is not limited thereto. Without departing from the scope of the technical solutions of the present disclosure, any person skilled in the art might make equivalent embodiments with some changes or modifications within the technical contents disclosed in the above, but any simple modifications, equivalent variations and modifications made to the above embodiments in accordance with the technical essence of the present disclosure, without departing from the contents of the technical solutions of the present disclosure, belong to the scope of the technical solutions of the present disclosure.