CN104939789B - Flexible tube for endoscope and its manufacture method - Google Patents
Flexible tube for endoscope and its manufacture method Download PDFInfo
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- CN104939789B CN104939789B CN201510116578.8A CN201510116578A CN104939789B CN 104939789 B CN104939789 B CN 104939789B CN 201510116578 A CN201510116578 A CN 201510116578A CN 104939789 B CN104939789 B CN 104939789B
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- flexible pipe
- exodermis
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 247
- 239000011347 resin Substances 0.000 claims abstract description 247
- 239000002994 raw material Substances 0.000 claims abstract description 101
- 230000002093 peripheral Effects 0.000 claims abstract description 18
- 238000007493 shaping process Methods 0.000 claims description 47
- 239000002184 metal Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 244000144985 peep Species 0.000 claims 1
- 239000007921 spray Substances 0.000 description 27
- 238000003780 insertion Methods 0.000 description 16
- 230000000750 progressive Effects 0.000 description 13
- 210000003414 Extremities Anatomy 0.000 description 9
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 7
- 238000005452 bending Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002803 Thermoplastic polyurethane Polymers 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 235000005035 ginseng Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 210000002429 large intestine Anatomy 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 230000000149 penetrating Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000011528 polyamide (building material) Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention provides the flexible tube for endoscope and its manufacture method of a kind of flexibility that can improve leading section and operability.Flexible tube for endoscope is on the outer peripheral face of flexible pipe raw material covered with exodermis.Exodermis has soft resin layer and hard resin layer.Exodermis has tapering and large-diameter portion.Large-diameter portion has rate of change portion.In rate of change portion, the thickness of soft resin layer is set gradually to increase from the base end side of flexible pipe raw material towards front, and gradually decrease the thickness of hard resin layer.Tapering is the position identical thickness ratio for turning into lower limit with the ratio of the thickness of the hard resin layer in rate of change portion, and keep and ratios constant portion identical thickness ratio, and towards the front of flexible pipe raw material, external diameter is gradually reduced, and minimum outer diameter position is consistent with the leading section of flexible pipe raw material.
Description
Technical field
The present invention relates to by the flexible tube for endoscope and its manufacture method of exodermis multilevel shaping.
Background technology
As the flexible tube for endoscope for forming the critical piece to the insertion section of the endoscope inserted inside examinee
It is component as follows, i.e. by flexible pipe raw material, (axial direction) is carried along its length, and to the outer peripheral face of the flexible pipe raw material
Spray the thermoplastic resins such as elastomer and shape cortex out, the flexible pipe raw material has winds curl by metal belt sheet
And formed helix tube and cover the helix tube periphery netted pipe.
To large intestine etc., intricately tortuous pipeline inserts for insertion section, therefore flexible tube for endoscope requirement has high insertion
(the easy progressive of insertion).Therefore, a kind of flexible tube for endoscope has been recorded in patent document 1 and 2, the endoscope-use is flexible
Pipe by by the exodermis with soft resin layer and the hard resin layer harder than the soft resin layer in the outer of flexible pipe raw material
Double-deck shaping is carried out on side face and is formed.In such exodermis for carrying out double-deck shaping and obtaining, in flexible tube for endoscope
Change the thickness ratio of soft resin layer and hard resin layer on axial direction, thus can in the axial direction of flexible tube for endoscope
Change flexibility.In order to make flexibility improve (softness) in the leading section of flexible tube for endoscope and connect with hand-held portion
The continuous base end part set makes flexibility reduce (hard), is usually formed as making in leading section the thickness of hard resin layer to reduce and in base
End makes the thickness ratio that the thickness of hard resin layer increases.
Change as the thickness ratio to making soft resin layer and hard resin layer in the axial direction of flexible tube for endoscope
The manufacture method that is formed of exodermis, make the variable speed of the screw rod of the resin after extrusion molten, so as to to flexible pipe
The amount for the resin that the outer peripheral face of raw material sprays is controlled.When making screw rod be rotated from height to low Rotary Variable, the resin of covering
The thickness of layer reduces, when from low rotate to high Rotary Variable, the thickness increase of the resin bed of covering.
On the other hand, in the flexible tube for endoscope of double-deck shaping is carried out to exodermis by above-mentioned manufacture method,
In the case where making the layer that hard resin layer is inner side, the small part of thickness especially near front end is to the recessed of flexible pipe raw material
Convex have an impact and produce deviation on the thickness of hard resin layer.It is interior when producing deviation on the thickness in hard resin layer
The flexibility of the leading section of sight glass flexible pipe reduces.In addition, make feelings of the soft resin layer for the layer in the outside of double-deck shaping
Under condition, easily adhere to impurity etc., so as to easily carry flaw on the surface.Therefore, the endoscope-use recorded in patent document 2 is scratched
Property pipe in, by forming crust in the double-deck shaping in outside by the configuration of soft resin layer in inner side and by hard resin layer configuration
Layer.
In addition, in the flexible tube for endoscope that patent document 3,4 is recorded, the position in the outside by being pointed to double-deck shaping
The hard resin layer put is ground etc. to form tapering, is made the front path in tapering so as to be formed and is made the big footpath of base end side
The exodermis of change.In addition, in the flexible tube for endoscope that patent document 5 is recorded, from the midway of the outer peripheral face of flexible pipe raw material
Covering is formed positioned at the hard resin layer of the position of the inner side of double-deck shaping in the outside of flexible pipe raw material and hard resin layer
Even soft resin layer.
【Citation】
【Patent document】
【Patent document 1】Japanese Unexamined Patent Publication 2009-106632 publications
【Patent document 2】Japanese Unexamined Patent Publication 2009-226023 publications
【Patent document 3】Japanese Unexamined Patent Publication 2005-81100 publications
【Patent document 4】Japanese Unexamined Patent Publication 2004-141492 publications
【Patent document 5】Japanese Unexamined Patent Publication 1-212532 publications
The content of the invention
【The invention problem to be solved】
In order that the flexibility for the flexible tube for endoscope that above-mentioned patent document 1,2 is recorded further improves, consideration makes soft
The ratio of the thickness of matter resin bed further increases and made the method that the ratio of the thickness of hard resin layer further reduces.So
And even if in order that the ratio of the thickness of hard resin layer reduces and switches the screw rod of extrusion resin as much as possible from height rotation
For low rotation, due to acting on resin with pressure during high rotary squeezing, therefore also it is difficult to reduce what is sprayed to flexible pipe raw material
The amount of resin.Therefore, there is boundary in the thickness ratio in double-deck shaping, even if making the ratio of the thickness of soft resin layer turn into most
Ratio that is big and making the thickness of hard resin layer turns into minimum, and there is also boundary for flexibility.In addition when suppression exodermis entirety
During thickness, the bumps of flexible pipe raw material have an impact, and deviation are produced in hardness, or bumps occur on the surface of exodermis.
Even if in addition, in the hard positioned at the position in the outside of bilayer shaping as above-mentioned patent document 3,4 is recorded
The midway of resin bed sets tapering, it is also possible to which difference of hardness generation before and after tapering varies widely and hinders insertion property.In addition,
, can in the front for the flexible pipe raw material for not forming hard resin layer in the flexible tube for endoscope that above-mentioned patent document 5 is recorded
Insertion property can be hindered.
The present invention in view of above-mentioned problem and propose, its object is to provide a kind of flexibility that can make leading section and insertion
Property improve flexible tube for endoscope and its manufacture method.
【Means for solving the problems】
The flexible tube for endoscope of the present invention possesses flexible pipe raw material, exodermis, the rate of change formed on exodermis
Portion and tapering.Flexible pipe raw material has helix tube and netted pipe.Helix tube is formed by the way that metal belt sheet is wound into curl,
The periphery of netted pipe covering helix tube.Exodermis is formed by carrying out double-deck shaping on the outer peripheral face of flexible pipe raw material, tool
There are soft resin layer and hard resin layer.Soft resin layer covers the outer peripheral face of flexible pipe raw material.Hard resin layer use is than soft
The resin of matter resin bed hard and cover the outside of soft resin layer.In rate of change portion, from the base end side of flexible pipe raw material
The thickness of hard resin layer is reduced relative to the ratio of the overall thickness of exodermis towards front, and make soft resin layer
Thickness relative to the overall thickness of exodermis ratio increase.Tapering is located at the front in rate of change portion, keeps ratio to become
It is hard as the position identical of lower limit relative to the ratio of the overall thickness of exodermis with the thickness of hard resin layer in change portion
The ratio of the thickness of matter resin layer thickness and soft resin layer, and subtract the external diameter of exodermis towards the front end of flexible pipe raw material
It is small, and minimum outer diameter position is consistent with the leading section of flexible pipe raw material.
It is preferred that the ratio of the thickness of soft resin layer and hard resin layer in tapering is 90∶10~98∶2.Additionally, it is preferred that
The external diameter in tapering is more than 10.5mm and below 12.8mm, and the difference of maximum outside diameter and minimum outer diameter be more than 0.04mm and
Below 0.3mm.Additionally, it is preferred that tapering has the shape proportionally grown in the axial direction with the size of maximum outside diameter.
It is in shaping path that flexible pipe raw material is lateral from cardinal extremity in the manufacture method of the flexible tube for endoscope of the present invention
Front is axially carried, and in soft resin of the outside of shaping path to shaping path supply molten condition and hard tree
Fat, thus for the whole side face around axle of flexible pipe raw material, extrusion molding exodermis, the exodermis, which has, covers the flexibility
The soft resin layer of the outer peripheral face of pipe raw material and the hard resin layer in the outside of covering soft resin layer, the endoscope-use are flexible
The manufacture method of pipe includes：Flexible pipe raw material is carried with constant transporting velocity, and made to the soft of shaping path supply
Resin increase, and hard resin is reduced, thus make the thickness of hard resin layer relative to the ratio of the overall thickness of exodermis
Reduce, and make the thickness of soft resin layer relative to the ratio increase of the overall thickness of exodermis, so as to form rate of change portion
The step of；And kept in rate of change portion with the thickness of hard resin layer relative to the overall thickness of exodermis ratio into
The ratio of the thickness of thickness and soft resin layer for the position identical hard resin layer of lower limit, and become relative to ratio is formed
Transporting velocity during change portion and gradually increase transporting velocity, be consequently formed makes crust with towards the front of flexible pipe raw material
The step of tapering of the external diameter reduction of layer.
【Invention effect】
The endoscope of the present invention forms tapering, and the tapering is located at the front in rate of change portion, protected in rate of change portion
Hold and make the ratio of thickness of soft resin layer to turn into the ratio of maximum position identical thickness, and towards flexible pipe raw material
Front and reduce the external diameter of exodermis, and as minimum outer diameter position it is consistent with the leading section of the flexible pipe raw material,
Therefore the flexibility of the leading section of flexible tube for endoscope can be improved.
Brief description of the drawings
Fig. 1 is the outside drawing for the structure for representing fujinon electronic video endoscope.
Fig. 2 is the partial sectional view for the brief structure for representing flexible tube for endoscope.
Fig. 3 is the curve map for the thickness for representing exodermis.
Fig. 4 is briefly to represent to carry out the block diagram of the structure of the progressive forming machine of the manufacture of flexible tube for endoscope.
Fig. 5 is the explanation figure for linking flexible pipe raw material for representing to link multiple flexible pipe raw materials.
Fig. 6 is the curve map of the control for the spray volume for representing the soft resin and hard resin sprayed based on press section.
Fig. 7 is the curve map for the control for representing the transporting velocity by the link flexible pipe raw material of trucking department carrying.
【Symbol description】
2 fujinon electronic video endoscopes
3 insertion sections
10 flexible pipes
11 helix tubes
12 netted pipes
14 flexible pipe raw materials
15 exodermises
15c rate of change portion
15a taperings
17 soft resin layers
18 hard resin layers
22 progressive forming machines
Embodiment
As shown in figure 1, fujinon electronic video endoscope 2 possesses：The insertion section 3 inserted into body cavity；Connect with the cardinal extremity part of insertion section 3
The continuous hand-held portion 5 set；The connector portion 6 being connected with processing unit, light supply apparatus；And by hand-held portion 5 with connecting
Connect the general flexible cord 7 being connected between device portion 6.
Insertion section 3 has leading section 3a, bending section 3b, bending section 3c successively from front end.In leading section, 3a is built-in with tested
The camera unit (not shown) of photography inside person.Bending section 3b and leading section 3a cardinal extremity is continuously set, and is bent freely
Ground is formed.Bending section 3c turns into structure as follows, i.e. occupies more than half length of insertion section 3, its substantially total length has and scratched
Property, especially the position of the inside insertion to body cavity etc. is more rich in flexibility.
As shown in Fig. 2 form bending section 3c flexible tube for endoscope (hereinafter referred to as flexible pipe.) 10 turn into it is following this
The structure of sample, i.e. cover braided metal on the helix tube 11 formed in most inner side by the way that metal belt sheet 11a to be wound to curl
The netted pipe 12 that line forms, and be fitted together to lid 13 respectively at both ends and be used as flexible pipe raw material 14, and in flexible pipe raw material 14
Outer peripheral face on cover the exodermis 15 that is made up of resin.In addition, coating has anti-medicine on the outer surface of exodermis 15
The film 16 such as containing fluorine.It should be noted that exodermis 15 and film 16 be to Rotating fields in order to clearly be illustrated,
And with the diameter of flexible pipe raw material 14 it is thicker describe.
Exodermis 15 covers the outer peripheral face of flexible pipe raw material 14.Exodermis 15 is to be laminated with soft resin layer 17 and hard tree
The double-decker of lipid layer 18, the outer peripheral face of the soft resin layer 17 covering flexible pipe raw material 14, the hard resin layer 18 covers soft
The outer peripheral face of matter resin bed 17.The materials'use soft resin of soft resin layer 17, the materials'use of hard resin layer 18 is than soft
The hard hard resin of matter resin bed 17.As the resin used in soft resin layer 17 and hard resin layer 18, for example, using hard
Spend two kinds of different thermoplastic polyurethane elastomers.
Exodermis 15 has tapering 15a, large-diameter portion 15b successively from the front end of flexible pipe raw material 14.Large-diameter portion 15b is in flexibility
Formed on the length direction (axial direction) of pipe raw material 14 with substantially uniform thickness.There is rate of change portion 15c in large-diameter portion 15b
With ratios constant portion 15d, 15e positioned at rate of change portion 15c front and base end side.
Fig. 3 conceptually represents the soft resin layer 17, hard resin layer 18 and crust formed on flexible pipe raw material 14
The thickness of layer 15.Dotted line 19 represents the thickness of soft resin layer 17 (reference picture 2), and single dotted broken line 20 represents hard resin layer 18
The thickness of (reference picture 2), solid line 21 represent the thickness of exodermis 15 (reference picture 2).In rate of change portion 15c, from flexible pipe
The thickness gradually thickness of increase and hard resin layer 18 of the cardinal extremity 14a sides of raw material 14 towards front end 14b sides and soft resin layer 17
Degree gradually decreases.In ratios constant portion 15d, turn into the thickness of soft resin layer 17 greatly and the thickness of hard resin layer 18 is small
Thickness ratio, in ratios constant portion 15e, turn into hard resin layer 18 thickness ratio is big and the thickness ratio of soft resin layer 17
The small thickness ratio of rate.In rate of change portion 15c, the thickness of soft resin layer 17 and hard resin layer 18 from ratios constant
Portion 15e identicals thickness ratio changes to ratios constant portion 15d identicals thickness ratio.
Tapering 15a is the position phase for turning into lower limit with the ratio of the thickness of the hard resin layer 18 in rate of change portion 15c
With thickness ratio, and keep with ratios constant portion 15d identical thickness ratios, and towards the front end of flexible pipe raw material 14
14b sides and external diameter is gradually reduced, and minimum outer diameter position is consistent with the leading section of flexible pipe raw material 14.Tapering 15a with it is big
The maximum outside diameter position that footpath portion 15b connects has and large-diameter portion 15b identical external diameters.Therefore, in flexible pipe 10, relative to big
Footpath portion 15b base end part and the flexibility of leading section uprises, also, relative to large-diameter portion 15b leading section, with from tapering
15a base end side towards front and flexibility uprises, in tapering, 15a turns into the leading section of minimum outer diameter, and flexibility becomes most
It is high.It should be noted that scratch the portion that the part that flexibility uprises in curved tube 10 is defined with flexibility in flexible pipe raw material 14
Point, do not include without flexible lid 13 and the exodermis 15 being covered on lid 13.
The axial total length L of flexible pipe 10 is, for example, 1700mm, and tapering 15a is formed in the front end away from flexible pipe raw material 14
14b is more than 100mm and below 400mm position.Rate of change portion 15c is formed is leaning on base end side and away from flexibility than tapering 15a
The front end 14b of pipe raw material 14 is more than 700mm and below 1100mm position.Tapering 15a maximum outside diameter is more than 10.5mm
And below 12.8mm.Tapering 15a maximum outside diameter is bigger and the maximum gauge of exodermis 15 more increases, before being difficult to have
Flexibility near end.Therefore, from flexibility this point, the preferably size of tapering 15a and maximum outside diameter proportionally
Formed in the axial direction longlyer.
In addition, tapering 15a has more than 0.04mm and below 0.3mm difference between maximum outside diameter and minimum outer diameter.
The external diameter difference is the difference of the thickness of exodermis 15, therefore the thickness of the exodermis 15 at the 15a of tapering has in leading section and base end part
There are more than 0.02mm and below 0.15mm difference.
The thickness of the exodermis 15 of the thickness of exodermis 15 at large-diameter portion 15b, i.e. tapering 15a maximum outside diameter opening position
For example, 400 μm, the thickness ratio of soft resin layer 17 and hard resin layer 18 at the 15a of tapering is 95: 5~97: 3.Need
Illustrate, the thickness ratio of the soft resin layer 17 at the 15a of tapering and hard resin layer 18 can be according to large-diameter portion 15b at
The overall thickness of exodermis 15 and reduce the ratio of the thickness of hard resin layer 18, and make the ratio of the thickness of soft resin layer 17
Example increase.It should be noted that soft resin layer 17 at the thickness and tapering 15a of exodermis 15 at large-diameter portion 15b with it is hard
The thickness ratio of matter resin bed 18 is not defined to above-mentioned thickness and thickness ratio, the exodermis 15 preferably at large-diameter portion 15b
Thickness is more than 200 μm and less than 800 μm, and the thickness of the soft resin layer 17 preferably at the 15a of tapering and hard resin layer 18
Ratio is 90: 10~98: 2.
It should be noted that as the resin used in soft resin layer 17 and hard resin layer 18, it is not defined to
Above-mentioned resin, various resins can be used according to the performance of purpose.Such as to pass through soft resin layer 17 and hard resin
In the case that layer 18 makes force variation, preferably using polyester-based elastomer, polystyrene based elastomers, polyurethane based elastomers.
In addition, in the case where change by soft resin layer 17 and hard resin layer 18 anti-medicine, preferably from polyolefin
Selected in elastomer, polyamide-based elastomer, Fuoroelastomer group.
In addition, the two kinds of resins used respectively in soft resin layer 17 and hard resin layer 18 are except hardness, elastic force, anti-
Outside medicine, can also make insulating properties, surface sliding as the change of various physical property.Furthermore it is also possible to use composition
Different resins changes physical property, in resin of the same race, can also change physical property using the different resin of density.
Hereinafter, the manufacture method of the flexible pipe 10 of said structure is illustrated.Representing that exodermis 15 is formed
Progressive forming machine 22 structure Fig. 4 in, progressive forming machine 22 possesses：Press section 23,24；For to flexible pipe raw material 14
The head 25 of outer peripheral face drape forming exodermis 15；Cooling end 26；Link flexible pipe raw material 31 described later is carried to head 25
Trucking department 27；The control unit 28 being controlled to above-mentioned position.Press section 23,24 is to possess hopper, screw rod 23a, 24a etc.
Known structure.
Trucking department 27 is made up of feed roller 29 and winding drum 30, is wound with multiple flexible pipes on feed roller 29
The link flexible pipe raw material 31 that raw material 14 links.By successively after linking flexible pipe raw material 31 and being wound in feed roller 29
Pull out, and the head 25 by the way that exodermis 15 is shaped and the cooling end 26 that cools down the exodermis 15 after shaping are wound in
Around roller 30.Above-mentioned feed roller 29 and winding drum 30 control rotary speed by control unit 28, link so as to carry
The transporting velocity switching of flexible pipe raw material 31.
Head 25 is formed by nozzle 32, cavity plate 33 and to the supporting mass 34 that they are supported with being fixed.In supporting mass 34
On the soft resin formed with the molten condition for will be extruded respectively from press section 23,24, hard resin to resin passage 38
The port 35,36 of submitting.
Formed with shaping path 37 in a manner of penetrating respective approximate centre in nozzle 32 and cavity plate 33.Shape path
37 be the path that the link flexible pipe raw material 31 carried vertically for use by trucking department 27 passes through, cross sectional shape orthogonal to the axial direction
It is rounded.Shaping path 37 is connected with the ejiction opening of the downstream equivalent to resin passage 38, from resin passage 38 by molten
The resin of state supplies to shaping path 37.
Resin passage 38 is formed by the space clipped by nozzle 32 and cavity plate 33.In the figure of nozzle 32 left end formed with
Coniform convex portion 32b with forming resin passage 38 together with the coniform recess 33a of the right-hand member of cavity plate 33.Also, formed with circle
Tapered recess 32a, the coniform recess 32a are continuously set with shaping the rear end of path 37, for linking flexible pipe raw material 31
Insertion guide.
Outlet opening 37a formed with shaping path 37 in cavity plate 33.The drape forming link flexible pipe of exodermis 15
Raw material 31 is carried by outlet opening 37a to cooling end 26.Cooling end 26 contains the coolants such as water, by leading in coolant
Come over to cool down and make its hardening exodermis 15.It should be noted that be not limited thereto, can also be by coolant or air etc.
Blow to exodermis 15 and cooled down.
Resin passage 38 configures the outside configuration in shaping path 37, the cross sectional shape orthogonal with the axial direction of shaping path 37
Form the circle in concentric circles with shaping path 37.The circumferential complete cycle of the ejiction opening of resin passage 38 and shaping path 37 connects
Connect.Therefore, the tree of molten condition is sprayed to the whole side face for linking flexible pipe raw material 31 of the ejiction opening by resin passage 38
Fat.
Press section 23,24 makes the port 35,36 on ejiction opening 23b, 24b and head 25 respectively in connection with will turn into soft resin
The soft resin and hard resin of the molten condition of the material of layer 17 and hard resin layer 18 are via resin passage 38 to head 25
Shaping path 37 extrude and supply respectively.Screw rod 23a, 24a each rotating speed are controlled by control unit 28, are thus adjusted from press section
23rd, 24 soft resin of molten condition and each spray volume of hard resin sprayed.
Heating temperature adjustment is carried out to press section 23,24 and head 25, thus make each temperature of soft resin and hard resin into
For high temperature, but in addition, screw rod 23a, 24a each rotating speed are higher, and each temperature of soft resin and hard resin is further
Improve, so as to the increase of respective mobility.
Port 35,36 is configured all centered on shaping path 37 in the outside of shaping path 37, and in the outer of port 35
Side configures port 36.Port 35,36 is the rounded substantially cylindrical shape of the cross sectional shape orthogonal with shaping the axial direction of path 37
Path.The downstream of the soft resin of port 35,36 and the transport direction of hard resin is connected with the upstream end of resin passage 38.
The coupling part turns into the merging part for collaborating soft resin and hard resin.Formed with both are divided between port 35,36
From separation unit 39.
Edge 39a is configured at merging part by separation unit 39, separates port 35,36 in the upstream side of merging part.From each end
The soft resins and hard resin that mouth 35,36 is sent out are collaborated by edge 39a.Edge 39a in order that two kinds of resins interflow and
Become tapering towards front end.
In merging part, inner side is overlapped with the soft resin of the molten condition supplied from port 35 and supplied from port 36
Molten condition hard resin overlap outside mode collaborated.Soft resin and hard resin behind interflow is with overlapping
State flow in the resin passage 38.Soft resin and hard resin keep overlapping state, from the week with shaping path 37
To the ejiction opening that connects of complete cycle sprayed towards the complete cycle for linking flexible pipe raw material 31.Accordingly, for flexible pipe raw material 14 around
The whole side face of axle, shape the soft resin layer 17 and covering soft resin layer of the outer peripheral face with covering flexible pipe raw material 14
This double-deck exodermis 15 of the hard resin layer 18 in 17 outside.
Before the forming process for shaping exodermis 15 on flexible pipe raw material 14 by progressive forming machine 22, as shown in figure 5,
Prepare to link flexible pipe raw material 31 using joint member 40.Joint member 40 possesses main part 40a and main part 40a's
The linking part 40b that both sides are inserted to the inner peripheral surface 13a of lid 13 respectively, via the joint member 40 by multiple flexible pipe raw materials 14
Be formed as connecting to the link flexible pipe raw material 31 of the state of one, so as to by progressive forming machine 22 carry out exodermis 15 into
Shape.
The main part 40a of joint member 40 external diameter is smaller than the external diameter of flexible pipe raw material 14.It should be noted that do not limit to
In this, as long as at least a portion of joint member 40 is smaller than the diameter of flexible pipe raw material 14.In addition, the table of joint member 40
Face is coated by release liners such as teflons (registration mark), so as to shape cortex 15 out as flexible pipe raw material 31 is linked
Afterwards, it is easily peeled off the exodermis 15 of the outer peripheral face shaping in the joint member 40.In addition, the main part of joint member 40
40a has flexibility, in order to answer the thickness ratio of resin and aggregate thickness in the shaping of the exodermis 15 at main part 40a
Original, joint member 40 is formed as considering the length that the balance of the transporting velocity of progressive forming and the quantity delivered of resin takes into account.
It should be noted that as flexible pipe raw material 31 is linked, above-mentioned structure is not limited to, such as can also use tight by screw thread
Gu the and joint member for linking flexible pipe raw material 14.
When process is formed by progressive forming machine 22, from press section 23,24 by the soft resin of molten condition and
Hard resin extrudes to head 25, and trucking department 27 is worked and will link flexible pipe raw material 31 and removed in shaping path 37
Fortune.As the carrying direction for linking flexible pipe raw material 31 carried by trucking department 27, from the cardinal extremity 14a of flexible pipe raw material 14 into
Shape path 37 is carried.Press section 23,24 is the state that soft resin and hard resin are extruded and supplied to head 25 all the time, from
The soft resin and hard resin that press section 23,24 extrudes to port 35,36 are collaborated by edge 39a, and with overlapping
State by resin passage 38 and to shaping path 37 supply.Thus, it is continuously formed the exodermis 15 of double-deck shaping.
In progressive forming machine 22, the soft resin and each spray volume of hard resin sprayed from press section 23,24 is entered
Row control (reference picture 6), and the transporting velocity of the link flexible pipe raw material 31 to being carried by trucking department 27 is controlled (ginseng
According to Fig. 7).Thereby, it is possible to change the thickness ratio of soft resin layer 17 and hard resin layer 18, and exodermis 15 can be made
The thickness aggregate thickness of hard resin layer 18 (soft resin layer 17 with) change.It should be noted that symbol T0 is from flexibility
The base end part of pipe raw material 14 starts the time of the shaping of exodermis 15, and symbol T4 is represented until the leading section of flexible pipe raw material 14 is
Only terminate the time of the shaping of exodermis 15.
As shown in fig. 6, for control for press section 23,24, first, untill time T0 to time T1, with hard
The spray volume of matter resin than soft resin spray volume more than constant basis spray soft resin and hard tree from press section 23,24
Fat.It should be noted that dotted line 41 represents the spray volume of the soft resin sprayed by press section 23, single dotted broken line 42 is represented by squeezing
The spray volume for the hard resin that splenium 24 sprays.Then, untill time T1 to time T2, make to be sprayed by press section 23 it is soft
The spray volume of matter resin gradually increases, and the spray volume for the hard resin for making to be sprayed by press section 24 gradually decreases, as when
Between T2 when, make the spray volume of soft resin more than the spray volume of hard resin.Then, untill time T2 to time T4, with
The spray volume of soft resin than hard resin spray volume more than constant basis spray soft resin and hard tree from press section 23,24
Fat.It should be noted that the soft resin and total spray volume of hard resin that are sprayed by press section 23,24 are constant all the time.By
This, when the cardinal extremity 14a sides of flexible pipe raw material 14 shape exodermis 15 untill the 14b sides of front end, from time T0 to time
Untill T1, with the constant thickness ratio that the ratio of the thickness of hard resin layer 18 is big and the ratio of the thickness of soft resin layer 17 is small
Rate is formed, and untill time T1 to time T2, makes the thickness of soft resin layer 17 from cardinal extremity 14a sides towards front end 14b sides
Ratio gradually increase, and gradually decrease the ratio of the thickness of hard resin layer 18.Then, it is being from time T2 to time T4
Only, with the ratio of the thickness of soft resin layer 17 is big and the ratio of the thickness of hard resin layer 18 is small constant thickness ratio shape
Into.
On the other hand, as shown in fig. 7, for control for trucking department 27, untill time T0 to time T3, with perseverance
Fixed transporting velocity V1, which is carried, links flexible pipe raw material 31.Solid line 43 represents the link flexible pipe raw material 31 carried by trucking department 27
Transporting velocity change.It should be noted that time T3 is set between above-mentioned time T2 and time T4.Then, from
Untill time T3 to time T4, transporting velocity is set gradually to increase from V1 to V2.Thus, in the cardinal extremity 14a from flexible pipe raw material 14
When side shapes exodermis 15 untill the 14b sides of front end, untill from time T0 to T3, soft resin layer 17 and hard resin are formed
The aggregate thickness constant large-diameter portion 15b of layer 18 is soft on flexible pipe raw material 14 untill time T3 to time T4, being layered in
The aggregate thickness of matter resin bed 17 and hard resin layer 18 is gradually reduced and forms tapering 15a.
As described above, untill time T0 to time T1, the thickness ratio of soft resin and hard resin is constant, from
Untill time T1 to time T2, thickness ratio change, untill time T2 to time T4, thickness ratio is constant, therefore big
Ratios constant portion 15e, rate of change portion 15c, ratios constant portion 15d are formed in footpath portion 15b respectively.Also, in time T3 to T4
Between the tapering 15a that is formed keep with ratios constant portion 15d identical thickness ratios, and towards the front end of flexible pipe raw material 14
14b sides and external diameter is gradually reduced.
In progressive forming machine 22, the screw rod 24a of press section 24 is rotated to low rotation from height and switched, and by press section 23
Screw rod 23a from it is low rotate to height rotation switching, thus make to shaping path 37 spray hard resin spray volume reduce, and
Make the spray volume of soft resin increase, even if but screw rod 24a is turned into low rotation as far as possible, during with high rotary squeezing hard resin
Pressure also remain, therefore make hard resin spray volume reduce on boundary be present.Thus, in the thickness of hard resin layer 18
Ratio on lower limit be present.Therefore, in the present embodiment, in rate of change portion 15c, enter to exercise when as time T2 hard
The ratio of the thickness of matter resin bed 18 turn into lower limit control, time T2 be as soft resin layer 17 thickness ratio most
The time of the minimum thickness ratio of big and the thickness of hard resin layer 18 ratio.As described above, in the present embodiment, make
In the case that the ratio of the thickness of hard resin layer 18 turns into lower limit, the thickness ratio of soft resin layer 17 and hard resin layer 18
As 95: 5~97: 3.Also, for ratios constant portion 15d and tapering 15a, also while keeping and making hard resin layer 18
Thickness ratio turn into lower limit position identical thickness ratio, while shaping exodermis 15.
In the forming process, flexible pipe raw material 31 will be linked and carried in shaping path 37, to multiple flexibility
Pipe raw material 14 continuously shapes exodermis 15.Therefore, in progressive forming machine 22, above-mentioned soft resin and hard is repeated
The control of each spray volume of matter resin and the transporting velocity of link flexible pipe raw material 31.That is, carrying out shown in Fig. 6 and Fig. 7
After control untill time T0 to time T4, exodermis 15 is reached in the cardinal extremity 14a of ensuing flexible pipe raw material 14
When shaping starting position, the control of each spray volume, transporting velocity when return to time T0.Equally carry out later by extruding
Portion 23,24 spray each spray volume, the transporting velocity carried by trucking department 27 control and link flexible pipe raw material 31 on into
Shape goes out exodermis 15.
Removed in the link flexible pipe raw material 31 that exodermis 15 has been shaped untill rearmost end from progressive forming machine 22
Afterwards, joint member 40 is removed from flexible pipe raw material 14, is separated into each flexible pipe raw material 14.Then, for the flexibility after separation
Pipe raw material 14, coat film 16 on exodermis 15 and complete flexible pipe 10.After the completion of flexible pipe 10 to fujinon electronic video endoscope 2
Assembling procedure is carried.
As described above, in flexible pipe 10, kept in rate of change portion 15c and make hard resin layer 18
The ratio of thickness turns into the position identical thickness ratio of lower limit, and having in exodermis 15 towards front end is gradually reduced external diameter
And the tapering 15a that the position that becomes minimum outer diameter is consistent with the leading section of flexible pipe raw material 14, therefore flexible pipe can be improved
The flexibility of 10 leading section.In existing flexible pipe, even if making the ratio of the thickness of hard resin layer turn into lower limit, also shape
Into the exodermis of uniform thickness, therefore the flexibility of leading section is insufficient, but is not such in the present embodiment.In addition,
Because tapering 15a minimum outer diameter position is located at the leading section of flexible pipe 10, thus towards front end and flexibility gradually steps up, and
The insertion of insertion section 3 improves.
In the above-described embodiment, ratios constant portion 15d, but this hair are formed between rate of change portion 15c and tapering 15a
It is bright to be not limited thereto, the continuous exodermises 15 of rate of change portion 15c and tapering 15a can also be formed.Forming rate of change
In the case of the continuous exodermises 15 of portion 15c and tapering 15a, as long as carrying out turning into constant untill as time T2 in time T0
Transporting velocity V1 and make transporting velocity since time T2 from V1 to V2 gradually increased controls, wherein, the time, T2 was
The thickness ratio that ratio as the thickness of soft resin layer 17 is maximum and the ratio of the thickness of hard resin layer 18 is minimum when
Between.
In addition, in the above-described embodiment, illustrated so that bilayer shapes as an example, but can also with hard resin layer,
Mode as forming intermediate layer between soft resin layer, exodermis is formed with more than two layers of multilayer.
In the above-described embodiment, have been illustrated to being entered using the image obtained inside camera unit shooting examinee
The fujinon electronic video endoscope of row observation, but the present invention is not limited to this, also can be tested to observe suitable for being led using optical picture
The endoscope of state inside person.
More than, the preferred embodiment of the present invention is had been described in detail, but the present invention be not defined to it is above-mentioned specific
Embodiment, various modifications and change can be carried out in the range of the purport of the invention that claims are recorded.
Claims (4)
1. a kind of flexible tube for endoscope, it possesses：
Flexible pipe raw material, it has the helix tube that metal belt sheet is wound curl and formed and covers the outer of the helix tube
The netted pipe in week；
Exodermis, it forms the outer peripheral face in the flexible pipe raw material by double-deck shaping, has the covering flexible pipe former
The soft resin layer of the outer peripheral face of material and use cover the soft resin layer than the resin of the soft resin layer hard
The hard resin layer in outside；
Rate of change portion, it is formed at the exodermis, makes described from the base end side of the flexible pipe raw material towards front
The thickness of hard resin layer reduces relative to the ratio of the overall thickness of the exodermis and makes the thickness of the soft resin layer
Relative to the ratio increase of the overall thickness of the exodermis, and the soft resin layer and the hard resin layer is total
Constant thickness；
Tapering, it is formed at the exodermis, positioned at the front in the rate of change portion, keeps in the rate of change portion
Turn into the position identical institute of lower limit relative to the ratio of the thickness of the soft resin layer with the thickness of the hard resin layer
State the ratio of the thickness of hard resin layer and the thickness of the soft resin layer, and towards the front end of the flexible pipe raw material and
Reduce the external diameter of the exodermis, and minimum outer diameter position is consistent with the leading section of the flexible pipe raw material.
2. flexible tube for endoscope according to claim 1, wherein,
The ratio of the thickness of the soft resin layer and the hard resin layer in the tapering is 90: 10~98: 2.
3. flexible tube for endoscope according to claim 1 or 2, wherein,
The maximum outside diameter in the tapering is more than 10.5mm and below 12.8mm, and the difference of maximum outside diameter and minimum outer diameter is
More than 0.04mm and below 0.3mm.
4. a kind of manufacture method of flexible tube for endoscope, by flexible pipe raw material from base end side side edge forward in shaping path
Axially carrying, and in soft resin of the outside of the shaping path to the shaping path supply molten condition and hard tree
Fat, thus have for the whole side face around axle of the flexible pipe raw material, extrusion molding exodermis, the exodermis described in covering
The soft resin layer of the outer peripheral face of flexible pipe raw material and cover the soft resin layer outside hard resin layer, it is described in peep
The manufacture method of mirror flexible pipe includes：
The flexible pipe raw material is carried with constant transporting velocity, and increases the soft resin to the shaping path supply
Add, and reduce hard resin, thus make the thickness of the hard resin layer relative to the ratio of the overall thickness of the exodermis
Example is reduced, and makes the thickness of the soft resin layer relative to the ratio increase of the overall thickness of the exodermis, so as to be formed
The step of rate of change portion；
The thickness with the hard resin layer is kept in the rate of change portion relative to the thickness of the soft resin layer
Ratio turns into the ratio of the thickness of the thickness of hard resin layer and the soft resin layer described in the position identical of lower limit, and phase
Transporting velocity during for forming the rate of change portion and gradually increase transporting velocity, be consequently formed with towards the flexibility
The front of pipe raw material and the step of make the tapering of external diameter reduction of the exodermis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-063997 | 2014-03-26 | ||
| JP2014063997A JP5968939B2 (en) | 2014-03-26 | 2014-03-26 | Endoscopic flexible tube and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104939789A CN104939789A (en) | 2015-09-30 |
| CN104939789B true CN104939789B (en) | 2018-02-09 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101416864A (en) * | 2007-10-25 | 2009-04-29 | 富士能株式会社 | Endoscope flexible tube and manufacture method thereof |
| CN102548462A (en) * | 2009-09-29 | 2012-07-04 | 富士胶片株式会社 | Flexible tube for endoscope and method for producing same |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101416864A (en) * | 2007-10-25 | 2009-04-29 | 富士能株式会社 | Endoscope flexible tube and manufacture method thereof |
| CN102548462A (en) * | 2009-09-29 | 2012-07-04 | 富士胶片株式会社 | Flexible tube for endoscope and method for producing same |
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