JP4500204B2 - Thread winding fixing method for coated tube for bending part - Google Patents

Description

  The present invention relates to a bobbin fixing method for a bending portion covering tube in which a bending portion covering tube fitted to an endoscope bending portion provided in an insertion portion of an endoscope is fixed to an endoscope bending portion by bobbin winding.

  For example, a medical endoscope includes an elongated insertion portion that is inserted into an observation site such as a body cavity, an operation portion that also serves as a grip portion disposed on the proximal end side of the insertion portion, and a side of the operation portion. And a universal cord extending from the section.

  The insertion portion includes a distal end portion including a distal end portion main body, which will be described later, formed of a hard metal member or the like from the distal end side, and a bending portion including a plurality of bending pieces connected to bend in the vertical and horizontal directions, for example. It is comprised with the soft tube part which is soft and flexible. And the bending part comprised by connecting a several bending piece is comprised with the some bending piece and the coating tube for bending parts made from rubber | gum which has the elasticity which covers these bending pieces, for example.

  When assembling the endoscope having the bending portion described above, the operation of covering the bending portion with the bending portion covering tube is the last step after the tip body and the bending piece are connected. It was. In order to cover and fix the bending portion covering tube to the connected bending pieces, the bending portion covering tube is fitted on the bending portion, and then a thread made of a plurality of materials is wound around the outer periphery of the bending portion covering tube. The method of fixing is taken.

  In the conventional thread winding fixing method, a double binding portion is provided in the first thread binding that holds down the bending portion covering tube. For this reason, the crossing portion of the yarn of the binding portion is located on the upper side of the covering tube for bending. The end yarn of the final bobbin is located between the bobbin and the bending covering tube, and it is necessary to place a yarn intersection at the center.

  Specifically, first, as shown in FIG. 6, a single loop 2 is formed on the yarn 1, and a double tie portion 3 is formed as shown in FIG. 7. In the loop 2 in this state, as shown in FIG. 8, the endoscope 6 in which the bending tube 4 is covered with the bending tube 4 is passed to a predetermined position. The yarns 1 protruding left and right at a predetermined position of the bending portion covering tube 5 are pulled together and fixed on the bending portion covering tube 5. In this state, a loop 7 is formed at one end of the yarn 1, and the yarn 1 on which the loop 7 is formed is wound around a predetermined position with the yarn 1 at the other end. When the yarn is wound up to a predetermined position, the wound yarn 1 is passed through the yarn 1 in which the loop 7 is formed as shown in FIG.

  Next, as shown in FIG. 10, the ends 1a and 1b of the yarn 1 forming the loop 7 are pulled in the direction of the arrow, and the intersecting portion 8 of the yarn 1 is placed below the yarn winding portion 9 as shown in FIG. Located in the center. In this state, a series of operations are completed by cutting both ends 1a and 1b of the yarn 1 protruding from the yarn winding portion 9. This operation is performed at a plurality of locations on the bending portion covering tube 5.

  However, in the above-described thread winding fixing method of the bending portion covering tube 5, a part of the bending portion covering tube 5 is pinpointed at the intersection 8 of the double binding portion 3 and the yarn 1 during autoclaving of the endoscope. As a result, the bending portion covering tube 5 was locally depressed and deformed.

  In this method of fixing the winding of the bending portion covering tube 5, the force of the yarn 1 that holds down the bending portion covering tube 5 varies at the position of each yarn 1 due to the tension of the operator's yarn 1. The covering tube 5 may be tightened more than necessary, or the necessary tightening force may not be obtained. Furthermore, skill is required to wind the yarn with the gap between the yarn 1 and the yarn 1 removed. Further, since the yarn 1 contracts when the endoscope in this state is exposed to a high temperature, the bending portion covering tube 5 is damaged by the yarn 1 at a portion where the yarn 1 is strongly wound. was there.

  Further, since the double thread binding portion 3 has the maximum outer diameter at the bobbin winding portion 9, there is a problem that it is difficult to perform a process of covering the surface of the bobbin winding in the subsequent step with an adhesive.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is that the bending portion covering tube can be easily wound around the bending portion of the endoscope, and even if the yarn contracts, the bending portion An object of the present invention is to provide a thread winding fixing method for a bending portion covering tube that can eliminate conventional problems without locally tightening the covering tube.

In order to achieve the above object, the present invention is configured such that a bending portion covering tube is fitted into an endoscope bending portion formed by connecting a plurality of bending pieces, and the bending portion covering tube is attached to the endoscope. In the thread winding fixing method for the bending portion covering tube for fixing the winding portion to the bending portion, a step of temporarily fixing the yarn by winding the yarn around the bending portion covering tube a plurality of times, and a first U on the winding side of the yarn A step of sandwiching the letter-shaped guide yarn between the yarns, a step of placing a second U-shaped guide yarn below the yarn on the winding side of the yarn, and the first and second U-shapes of the yarn A step of winding the guide yarn on the upper side and tightly winding the bending portion covering tube on the endoscope bending portion; and the first and second U-shaped guide yarns at both ends of the yarn. Toka step of pulling out such that located under the yarn wound densely A winding method of fixing the bending portion covering tube made.

  According to the present invention, since the double entangled portion and the crossing portion of the yarn do not occur on the upper side of the bending portion covering tube, the bending portion covering tube is simply tightened even when the autoclave is applied. There is an effect that it is not tightened locally, it is not necessary to cause problems such as depression deformation in the bending portion covering tube, and the thread winding fixing work is also easy.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1 to 5 show a procedure of a method for fixing a winding portion of a covering tube for a bending portion. Reference numeral 11 denotes an endoscope. Reference numeral 12 denotes an endoscope bending portion configured by connecting a plurality of bending pieces. A bending portion covering tube 13 is fitted on the endoscope bending portion 12, and a method of winding and fixing the bending portion covering tube 13 to the endoscope bending portion 12 will be described.

  First, as shown in FIG. 1, the yarn 14 is wound several times around a predetermined start position of the thread winding fixing portion 13a of the bending portion covering tube 13, and one end portion 14a of the yarn 14 is wrapped with a tape 15 or the like. Temporarily fix it on the surface. Next, the first drawn yarn 16 having a desired length as the first U-shaped guide yarn is used, and the first drawn yarn 16 is formed into a U shape at a predetermined start position of the bobbin fixing portion 13a. The loop is made, and the loop portion 16a of the drawn yarn 16 is inserted into the yarn 14 in the direction of arrow a. Then, one of the loop portions 16a is inserted between the outer peripheral surface of the bending portion covering tube 13 and the yarn 14 wound around the outer peripheral surface, and the first drawn yarn 16 is fixed.

  As shown in FIG. 2, a second drawn yarn 17 having a desired length as a second U-shaped guide yarn is used, and this second drawn yarn 17 is looped in a U-shape, Similarly, the loop portion 17a of the second drawing thread 17 is inserted into the rear end side of the drawing thread 16 in the direction of the arrow b and fixed. Next, as shown in FIG. 3, the yarn 14 is wound a plurality of times to a specified position of the bobbin fixing portion 13 a of the bending portion covering tube 13.

  Next, the two end portions 16b extending to the opposite side of the loop portion 16a of the first drawn yarn 16 are held together and pulled in the direction of the arrow c to be positioned in the loop portion 16a of the first drawn yarn 16 The thread 14 to be tightened is tightened by the loop portion 16a. Next, in order to prevent the yarn 14 at the other final winding position of the yarn 14 from being unwound, it is pressed together with the bending portion covering tube 13 with a finger or the like, and the yarn 14 extending therefrom is cut by leaving about 100 mm. Furthermore, the cut end portion 14b of the yarn 14 is passed through the loop portion 17a of the second drawn yarn 17, and the two end portions 17b extending to the opposite side of the loop portion 17a of the second drawn yarn 17 are both arrowed. Pulling in the d direction, the thread 14 is tightened by the loop portion 17 a of the second drawn thread 17.

  Next, the tape 15 of the temporarily fixed portion of the yarn 14 that has been temporarily fixed is removed, and the yarn 14 is returned to the portion where the spool is fixed. Next, the first drawn yarn 16 and the second drawn yarn 17 are further drawn in the directions of arrows c and d while holding the two portions 16a and 17a extending from each other. Then, as shown in FIG. 4, by removing the first drawn yarn 16 and the second drawn yarn 17 from the lower side of the spool portion 18, as shown in FIG. The bobbin 4 is fixed to the mirror bending portion 12 by the thread 4. By performing this operation on both ends of the predetermined position of the bending portion covering tube 13, the bobbin fixing operation of the bending portion covering tube 13 with respect to the endoscope bending portion 12 is completed.

  In this way, by fixing the bending portion covering tube 13 to the endoscope bending portion 12, there is no conventional yarn binding step, and a yarn intersection portion is present on the surface of the bending portion covering tube 13. do not do. Accordingly, even when the endoscope is exposed under the autoclave, the entire yarn contracts uniformly, so that the problem that the bending portion covering tube 13 is locally depressed and deformed by the yarn 14 is improved.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The front view of the thread winding state of the covering tube for bending parts which shows 1st Embodiment of this invention. The front view of the thread winding state of the covering tube for curved parts which shows the same embodiment. The front view of the thread winding state of the covering tube for curved parts which shows the same embodiment. The front view of the thread winding state of the covering tube for curved parts which shows the same embodiment. The front view which expanded the wound state of the covering tube for curved parts which shows the same embodiment. The perspective view of the thread winding state of the conventional coating tube for curved parts. The perspective view of the thread winding state of the covering tube for curved parts similarly. The perspective view of the thread winding state of the covering tube for curved parts similarly. The perspective view of the thread winding state of the covering tube for curved parts similarly. The perspective view of the thread winding state of the covering tube for bending parts similarly. The enlarged front view of the thread winding state of the covering tube for curved parts similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 ... Endoscope bending part, 13 ... Covering tube for bending parts, 14 ... Yarn, 16 ... 1st extraction thread (1st U-shaped guide thread), 17 ... 2nd extraction thread (2nd U Character-shaped guide thread)

Claims (1)

A bending portion covering tube is formed by fitting a bending portion covering tube to an endoscope bending portion formed by connecting a plurality of bending pieces, and winding the bending portion covering tube on the endoscope bending portion. In the thread winding fixing method,
A step of winding the yarn around the outer periphery of the bending portion coating tube a plurality of times and temporarily fixing the yarn;
A step of sandwiching a first U-shaped guide yarn between the yarn winding side and the yarn;
Placing a second U-shaped guide yarn below the yarn on the winding side of the yarn; and
Winding the yarn around the first and second U-shaped guide yarns and tightly winding the bending portion covering tube to the endoscope bending portion; and
Pulling out the first and second U-shaped guide yarns so that both ends of the yarn are located under the tightly wound yarn ; and
A method for fixing a wound tube for a curved portion comprising:

Images