JP5124302B2 - Endoscope forceps plug - Google Patents

Description

  The present invention relates to a forceps plug of an endoscope provided at an entrance of a treatment instrument insertion channel disposed in an endoscope, and more particularly to a configuration of a forceps plug capable of maintaining high sealing performance.

  FIG. 7 shows a configuration of a conventional endoscope, and the endoscope includes, for example, a distal end portion 1A including a solid-state imaging device, a bending portion 1B, an operation portion 1C, and the like. The operation portion 1C is provided with a forceps port portion (treatment tool insertion channel introduction port) 3 having a forceps plug, and a treatment tool insertion channel 4 is disposed from the forceps port portion 3 to the distal end surface of the distal end portion 1A. The The treatment instrument insertion channel 4 is connected to a suction tube 5 for sucking fluids and the like in the observed body, and the treatment instrument insertion channel 4 also functions as a suction tube. The operation section 1C is provided with a bending operation knob 6, and a suction button 7a, an air / water supply button 7b, a camera shutter button 7c, and the like are arranged.

FIG. 8 shows an example of the configuration of the forceps opening 3, and a rubber forceps plug 8 is attached to the entrance of the treatment instrument insertion channel 4. The forceps plug 8 is first slit S ₁ is formed straight, which can be passed through the treatment instrument in the center of the lower body 8a, a second slit S ₂ similar to the central portion of the lid 8b are formed The slits S ₁ and S ₂ maintain the sealing property in the treatment instrument insertion channel 4 and enable the treatment instrument to be inserted into the treatment instrument insertion channel 4.

According to such an endoscope, by operating the suction button 7a, the contents of the object to be observed can be sucked through the treatment instrument insertion channel 4 and the suction tube 5, and a forceps having a forceps plug 8 is provided. By introducing a treatment tool (forceps or the like) from the mouth portion 3 and guiding it to the distal end portion 1A, it is possible to perform various treatments in the observed body. At this time, in the forceps plug 8, only to insert the treatment instrument from the first slit S ₁ in a state in which the cover body is removed 8b, or the first slits S ₁ and a second slit S in a state of wearing the lid 8b _The treatment instrument can be inserted from both of the _two .
Japanese Patent Laid-Open No. 2-200234 JP 56-118602 A JP 58-29440 A

However, since the forceps plug 8 of the conventional endoscope uses the slits (S ₁ , S ₂ ) obtained by cutting the rubber member in a straight line as described above, the sealing performance in the treatment instrument insertion channel 4 is used. It is difficult to maintain (airtightness) completely, and as the number of uses increases, the roots of the slits (S ₁ , S ₂ ) go down and there is no restoring force (elasticity), thereby reducing the sealing performance. There was a problem. That is, in the forceps plug 8, when the treatment instrument insertion channel 4 functions as a suction tube, in order to suck the forceps plug 8 in a completely closed state, and even when not sucked, In order to prevent the leakage of fluid, a high sealing property is required, and this sealing property cannot be maintained.

  The present invention has been made in view of the above problems, and an object thereof is an endoscope forceps capable of maintaining high sealing performance without worrying about a sag at the base of a slit or a reduction in restoring force. To provide a stopper.

In order to achieve the above object, the invention of claim 1 is an endoscopic forceps plug provided at an entrance of an endoscope treatment instrument insertion channel, wherein an elastic tube body having at least one end closed is provided, The elastic tube body is placed in close contact with the insertion passage of the forceps plug main body with a biasing force that expands in the radial direction, and the treatment instrument is guided to the insertion passage with the side surface of the elastic tube body being crushed. It is characterized by doing so.
The invention according to claim 2 is characterized in that a treatment instrument guide portion (guide portion) formed by forming an inclined concave surface (inverted conical concave surface) extending outward is provided at the entrance of the main body insertion passage.
According to a third aspect of the present invention, the elastic tube body and the main body passage include a protrusion formed on one of them and an engaging groove formed on the other for engaging the protrusion. Is provided.

According to the configuration of the present invention, for example, the elastic tube body is fixed to the main body insertion passage by engaging the protrusion provided on the elastic tube body with the engagement groove provided in the main body insertion passage. A treatment tool (forceps or the like) can be inserted into the insertion path from the guide portion having the inclined concave surface. At this time, the elastic tube body is passed through the treatment tool while being crushed.
On the other hand, after the treatment instrument is removed, the elastic tube body is restored to the original cylindrical shape and is brought into close contact with the main body insertion path, so that the inside of the treatment instrument insertion channel can be completely sealed.

According to the forceps plug of the endoscope of the present invention, there is no concern about the sag of the slit base or a reduction in restoring force, and it is possible to maintain high sealing performance and to prolong the product life.
According to the configuration of claim 2, the treatment instrument can be smoothly guided and inserted into the main body insertion path by the treatment instrument guide, and according to the configuration of claim 3, the elastic tube body is firmly attached to the main body insertion path. There is an effect that it can be fixed.

  FIGS. 1 to 6 show the configuration of the forceps plug (12) of the endoscope according to the embodiment. FIGS. 1 and 2 show forceps provided in the endoscope operation section (1C in FIG. 7). 3 is a cross section of the forceps plug 12, and FIGS. 5 and 6 are cross sections of the forceps mouth. As shown in the figure, the forceps port portion 10 is provided so as to branch from the side surface of the exterior body 11 of the operation portion and serve as an introduction port for the internal treatment instrument insertion channel Ch, and a forceps plug 12 is provided in the forceps port portion 10. It is attached.

  As shown in FIG. 3 and the like, the forceps plug 12 includes, for example, a rubber main body 14 in which a tubular insertion passage 14h penetrating the center portion in the vertical direction is formed, and a cylindrical elastic member fitted into the insertion passage 14h. And a tube body 15. The elastic tube body 15 is a cylindrical tube formed of silicon, fluororesin or the like so that the upper end is closed and the lower end is opened (becomes an open state), and its length is longer than the main body insertion passage 14h. Long formed. The elastic tube body 15 has an outer diameter that is substantially the same as or slightly larger than the inner diameter of the insertion passage 14h, and is attached to the insertion passage 14h with a biasing force extending in the radial direction from the center thereof. Is done.

Further, for example, a cube-shaped (or cylindrical or other shape) protrusion 16 is formed on the side surface of the elastic tube body 15, and two protrusions 16 are provided at predetermined intervals in the vertical direction. Two places are provided in the circumferential direction. On the other hand, on the wall surface of the insertion passage 14h of the main body 14, respective engaging grooves 14j are formed at positions corresponding to the protrusions 16, and the respective protrusions 16 are engaged with these engaging grooves 14j. Yes. That is, two upper and lower projections 16 engaged entrapment the wall portion of the insertion path 14 h the engaging groove 14j, and by arranging them in the circumferential direction two positions, obtained fixed state with a solid, Further, circumferential rotation can be prevented. The lower engaging groove 14j uses a groove provided as a fitting groove for fitting and attaching to the distal end attaching portion of the tube member 18 of the treatment instrument insertion channel Ch.

  Further, as shown in FIG. 3B in a state in which the forceps plug 12 of FIG. 3A is rotated 90 degrees, the upper entrance of the insertion passage 14h of the main body 14 has, for example, two places separated by 180 degrees. In a predetermined range (for example, a range of about 90 ° to 120 °), a treatment instrument guide portion (guide portion) 14K formed of an inverted conical inclined concave surface extending outward is formed. In addition, you may provide this guide part 14K in the perimeter range of the entrance of the insertion path 14h.

  As shown in FIG. 2, the forceps plug 12 has an elastic tube body 15 attached to the insertion passage 14h of the main body 14 while engaging the protrusion 16 with the engagement groove 14j. By attaching to the tip of 18, the forceps opening 10 in the state shown in FIGS. 1 and 5 is manufactured.

  The embodiment is configured as described above, and in the normal state or when performing suction, the outer diameter of the elastic tube body 15 is larger than the inner diameter of the insertion passage 14h as shown in FIGS. It is formed slightly larger and has an urging force that expands in the radial direction, its outer peripheral surface is in close contact with the inner surface of the insertion passage 14h of the main body 14, and the length of the elastic tube body 15 is made longer than the insertion passage 14h. Thus, the inside of the treatment instrument insertion channel Ch and the inside of the suction pipe communicating with the channel Ch are kept in a highly sealed (airtight) state, and air and fluid in the observed body are treated from the distal end portion. Leakage or outflow through the instrument insertion channel Ch is prevented. In addition, as with conventional slit plugs, the effects of sagging due to repeated use and reduction in restoring force are reduced.

  On the other hand, when performing various treatments, as shown in FIG. 6, the treatment tool 20 (forceps or the like) is inserted from the inclined concave surface of the guide portion 14K of the forceps plug 12 toward the insertion passage 14h. The elastic tube body 15 is deformed so that its side surface is crushed as shown in FIG. 6 or 15-S of FIG. 2 and as shown in FIG. 4 when the forceps plug 12 is viewed from below. The treatment tool 20 is guided into the insertion path 14h. In addition, after the treatment instrument 20 is removed, the deformation of the elastic tube body 15 is immediately restored, and the sealed state in the treatment instrument insertion channel Ch is ensured by the close contact between the elastic tube body 15 and the insertion passage 14h. In addition, according to the said guide part 14K, there exists an advantage that introduction of the treatment tool 20 becomes smooth and easy.

  In the above embodiment, the elastic tube body 15 is used in which only the upper end is closed, but a tube body in which only the lower end is closed may be used, or both the upper end and the lower end are closed. Alternatively, a tube body having a small air vent hole may be used. In addition, the elastic tube body 15 is made to have a high restoring force against crushing deformation by appropriately selecting the material and thickness thereof. However, another elastic member such as a sponge is provided in the elastic tube body 15. By putting it in, you may make it raise restoring power.

It is a perspective view which shows the structure of the forceps opening | mouth part which attached the forceps stopper of the endoscope which concerns on the Example of this invention. It is a perspective view which decomposes | disassembles and shows a forceps stopper in the forceps opening | mouth part of FIG. The structure of the forceps plug of the endoscope of the embodiment is shown, FIG. (A) is an exploded cross-sectional view in a state where the protrusion and the engagement groove are visible, and FIG. (B) is a diagram illustrating a rotation of the forceps plug of FIG. It is sectional drawing when an elastic tube body is attached to a main body. It is a figure when the forceps stopper which inserted the treatment tool in the Example is seen from the lower side. It is sectional drawing which shows the structure inside the forceps opening | mouth part of an Example. It is sectional drawing which shows a state when a treatment tool is inserted in the forceps opening | mouth part of an Example. It is a figure which shows the structure of the conventional endoscope. It is sectional drawing which shows the structure of the forceps stopper of the endoscope in the past.

Explanation of symbols

3, 10 ... forceps opening, 4, Ch ... treatment instrument insertion channel,
8, 12 ... forceps plug, 14 ... forceps plug body,
14h ... insertion path, 14j ... engagement groove,
14K ... guide part (inclined concave surface),
15 ... elastic tube body, 16 ... projection,
18 ... pipe member, 20 ... treatment tool.

Claims (3)

An endoscope forceps plug provided at an entrance of an endoscope treatment instrument insertion channel,
An elastic tube body having at least one end closed is provided, and the elastic tube body is disposed in close contact with the insertion passage of the forceps plug main body with a biasing force that expands in the radial direction, and the side surface of the elastic tube body is crushed. An endoscopic forceps plug in which the treatment tool is guided to the insertion passage in a state of being applied .   2. The endoscopic forceps plug according to claim 1, wherein a treatment instrument guide portion formed by forming an inclined concave surface extending outward is provided at an entrance of the main body insertion passage.   The elastic tube body and the main body insertion passage are provided with a fixing means including a protrusion formed on one of them and an engaging groove formed on the other for engaging the protrusion. The endoscopic forceps plug according to claim 1 or 2.

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