CN112120652A

CN112120652A - Directional bent endoscope catheter structure

Info

Publication number: CN112120652A
Application number: CN202011087123.5A
Authority: CN
Inventors: 王少刚; 杨勇强; 毛业云; 龙刚; 胡学成; 乐东东; 秦操; 颜雪辉; 吴淑香; 余芬芬; 程芬
Original assignee: Youcare Technology Co ltd Wuhan
Current assignee: Youcare Technology Co ltd Wuhan
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2020-12-25

Abstract

The invention discloses a directionally-bending endoscope catheter structure, which comprises a catheter handle and a catheter, wherein the catheter comprises a hard sheath tube with one end arranged in the catheter handle and a core rod coaxially inserted into the hard sheath tube, the front end part of the core rod comprises a bendable elastic tube section positioned in front of the hard sheath tube, the front end of the elastic tube section is fixedly provided with an end cap, an elastic body capable of directionally bending the elastic tube section is connected between the end cap and the front end of the hard sheath tube, and a thumb wheel screw driving mechanism capable of driving the hard sheath tube to axially move is arranged in the catheter handle. The endoscope catheter is rotated through the knob, the catheter can be bent for 360 degrees in all directions, the bending direction of the catheter is determined without deflection, and the bending precision is high.

Description

Directional bent endoscope catheter structure

Technical Field

The invention relates to the technical field of endoscopes, in particular to a directionally-bent endoscope guide tube structure.

Background

At present, in an endoscope catheter used in clinical operation, in order to facilitate entering a diseased organ of a human body to observe and diagnose and treat in a large range, the head of the catheter is required to be bent within a certain angle range so as to drive an endoscope or a corresponding surgical instrument to perform operation in a direct-view image environment, and the bending (unidirectional or multidirectional) mode of the catheter generally comprises the following steps: 1. a steel wire rope is arranged in the elastic plastic guide pipe for traction and steering; 2. and a steel wire rope is arranged in the metal snake bone for traction and steering. The two modes adopt steel wire ropes for traction.

For the bending of the elastic plastic pipe, besides the steel wire rope is required to be arranged in the guide pipe, a supporting pipe with certain strength is also required to be arranged in the guide pipe, on one hand, the supporting strength of the plastic pipe is improved, on the other hand, the bending length of the plastic pipe is determined according to the position of the supporting pipe in the guide pipe, and the structure for arranging the steel wire rope and the supporting pipe in the plastic pipe has the following disadvantages: 1. the radial size of the conduit is enlarged; 2. the supporting tube is not easy to be arranged and fixed in the catheter; 3. when the catheter is bent under the traction of the steel wire rope, the bending direction and the bending angle cannot be determined, and the judgment of the position of the head end of the catheter in the operation is not facilitated.

For the conduit adopting the snake bone bending and steering mode, the bending is still realized by the traction of the steel wire rope, but because the snake bone sections and the conduit sections are generally installed in a bonding or welding mode, the relative positions of the snake bone sections and the conduit sections are fixed, and the multi-directional bending is not easy to realize due to the limitation of the bending angle, the bending radius and the number of the steel wire ropes.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provide an endoscope guide pipe structure which can realize accurate bending and steering without steel wire rope traction.

To achieve the purpose, the invention designs a directional bending endoscope conduit structure, which comprises a conduit handle and a conduit, and is characterized in that: the catheter comprises a hard sheath tube and a core rod, wherein one end of the hard sheath tube is arranged in the catheter handle, the core rod is coaxially inserted into the hard sheath tube, the front end part of the core rod comprises an elastic tube section which is arranged in front of the hard sheath tube and can be bent, an end cap is fixed at the front end of the elastic tube section, an elastic body which can enable the elastic tube section to be bent directionally is connected between the end cap and the front end of the hard sheath tube, and a thumb wheel screw driving mechanism which can drive the hard sheath tube to move axially is arranged in the catheter handle.

Further, the front end of the catheter handle is provided with a knob, the surface of the hard sheath pipe is provided with a positioning strip along the axial direction of the hard sheath pipe, and a knob shaft hole matched with the hard sheath pipe and a positioning groove matched with the positioning strip are formed in the knob.

Further, hard sheath pipe include first hard sheath pipe and with the hard sheath pipe of second of the coaxial intercommunication of one end of first hard sheath pipe, the diameter of the hard sheath pipe of second is less than the diameter of first hard sheath pipe, coaxial being provided with on the surface of first hard sheath pipe with thumb wheel screw drive mechanism complex loop platform.

Further, be provided with along its axial in the pipe handle and be used for the installation thumb wheel screw rod actuating mechanism's actuating mechanism mounting groove, thumb wheel screw rod actuating mechanism including coaxial set up in the actuating mechanism mounting groove, have the screw shaft in shaft hole and with screw shaft threaded connection's thumb wheel, seted up on the pipe handle and supplied manual operation the breach of thumb wheel, the preceding terminal surface of screw shaft with the rear end face laminating of ring platform, be provided with in the actuating mechanism mounting groove and prevent screw shaft pivoted axial is supported and is pushed away the mechanism.

Further, the axial pushing mechanism comprises a pushing spring which is coaxially arranged with the first hard sheath and connected between the front end face of the ring platform and the inner surface of the driving mechanism mounting groove.

Furthermore, a gasket coaxial with the first hard sheath pipe is fixed on the inner surface of the rear end of the driving mechanism mounting groove, and the front end face of the gasket is attached to the rear end face of the first hard sheath pipe.

Furthermore, a mandrel limiting mechanism which is matched with the catheter handle to prevent the mandrel from moving forwards and axially is arranged on the mandrel and the catheter handle, the mandrel limiting mechanism comprises a limiting ring which is coaxially fixed on the surface of the rear end of the mandrel and has a diameter larger than that of the mandrel and a limiting seat arranged in the catheter handle, a limiting seat through hole which is matched with the mandrel and is used for the mandrel to pass through is formed in the limiting seat, and the aperture of the limiting seat through hole is smaller than that of the limiting ring.

The elastomer has four structures:

the elastic body comprises a one-way elastic conduit, and a plurality of transversely-arranged V-shaped grooves are uniformly arranged on one side surface of the one-way elastic conduit at intervals along the axial direction of the one-way elastic conduit.

Two the elastomer is including having elasticity, the spring board and the two-way elasticity pipe of rectangular shape, the both sides surface that corresponds of two-way elasticity pipe is all followed the even spaced V type groove that is equipped with a plurality of transverse arrangement of axial of two-way elasticity pipe, the V type groove on the relative both sides surface of two-way elasticity pipe is followed the axial direction staggered arrangement of two-way elasticity pipe, a side surface coaxial fixed in of spring board two-way elasticity pipe has been seted up a side of V type groove is surperficial.

And thirdly, the elastic body comprises an elastic and strip-shaped spring plate and a bending spring, and one side surface of the spring plate is coaxially fixed on the bending spring.

And fourthly, the elastic body comprises a one-way elastic pipe, a plurality of spiral elastic grooves are uniformly arranged on the surface of one side of the one-way elastic pipe at intervals along the axial direction of the one-way elastic pipe, and the spiral elastic grooves are of groove structures with narrow left and right sides and wide middle.

The invention has the beneficial effects that: the endoscope catheter is rotated through the knob, the catheter can be bent for 360 degrees in all directions, the bending direction of the catheter is determined without deflection, and the bending precision is high. The elastic body structure of the catheter head can be matched with a bending curve according to the requirements of doctors, is flexibly arranged and is beneficial to the catheter to enter a specific human body cavity. The elastic body replaces the steel wire rope structure in the elastic plastic tube and the snake bone tube, a supporting tube is not needed, the outer diameter of the catheter is reduced, the bent control structure of the catheter is simplified, and the miniaturization of the catheter is realized. The problem of the crooked skew of elasticity plastic pipe direction is solved, the control precision of operation has been improved. The processing precision of elastomer component is high, is favorable to the supplementary of pipe to reset, has solved the elasticity plastic pipe and has reset insufficient problem after the bending.

Drawings

FIG. 1 is a perspective view of an endoscopic catheter of the present invention;

FIG. 2 is a front view of the endoscope catheter of the present invention;

FIG. 3 is a side view of an endoscopic catheter of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is an enlarged view of FIG. 3 at B;

FIG. 6 is a perspective view of the sheath according to the present invention;

FIG. 7 is a perspective view of the knob of the present invention;

FIG. 8 is a front view of the knob of the present invention;

FIG. 9 is a front view of a unidirectional resilient catheter of the present invention;

FIG. 10 is a front view of the combination structure of the bidirectional elastic conduit and the spring plate of the present invention;

FIG. 11 is a front view of the combination of a curved spring and spring plate of the present invention;

FIG. 12 is a front view of the unidirectional elastic tube of the present invention;

FIG. 13 is a view showing a state in which an endoscope guide tube is bent according to the present invention;

the device comprises a catheter handle (1.1-a driving mechanism mounting groove), a hard sheath tube (2.1-a first hard sheath tube, a second hard sheath tube, a ring platform (2.3)), a core rod (3.1-an elastic tube section), a joint (4), a joint (5), an end cap (6), a knob (7), a positioning strip (8), a knob shaft hole (9), a positioning groove (10), a screw shaft (11), a dial wheel (12), a notch (12), a pushing spring (13), a gasket (14), a spacing ring (15), a spacing seat (16), a spacing seat through hole (17), a unidirectional elastic catheter (18), a V-shaped groove (19), a spring plate (20), a bidirectional elastic catheter (21), a bending spring (22), and a unidirectional elastic catheter (23.1-a spiral elastic groove).

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

The directionally curved endoscope catheter structure shown in fig. 1 to 13 includes a catheter handle 1 and a catheter, and the catheter includes a hard sheath 2 having one end coaxially disposed in the catheter handle 1 and a core rod 3 coaxially inserted in the hard sheath 2.

Hard sheath pipe 2 includes first hard sheath pipe 2.1 and the second hard sheath pipe 2.2 with the coaxial intercommunication of one end of first hard sheath pipe 2.1, the diameter of second hard sheath pipe 2.2 is less than the diameter of first hard sheath pipe 2.1, coaxial ring platform 2.3 that is provided with on the surface of first hard sheath pipe 2.1, first hard sheath pipe 2.1 surface is provided with location strip 7 along its axial, the front end of catheter handle 1 is provided with knob 6, set up in knob 6 with hard sheath pipe 2 complex knob shaft hole 8 and with location strip 7 complex positioning groove 9.

The plug 3 is flexible elasticity plastic pipe, the plug passageway (including water injection passageway, apparatus passageway and image illumination passageway) has been seted up along its axial in the plug 3, be provided with on the pipe handle 1 with the joint 4 of above-mentioned three passageway intercommunication (including water injection joint, image joint and apparatus connect), 3 rear end fixed surface of plug are connected with the spacing ring 15 that the diameter is greater than the plug 3 diameter, be provided with spacing seat 16 in the pipe handle 1, set up in the spacing seat 16 and cooperate with plug 3, the spacing seat via hole 17 that supplies plug 3 to pass, the aperture of spacing seat via hole 17 is less than the diameter of spacing ring 15. The front end of plug 3 is fixed with end cap 5, is connected with the elastomer between the front end of end cap 5 and hard sheath pipe 2, and the elastomer has multiple structural style to satisfy the different crooked demands that turn to of plug 3.

The first structure shown in fig. 9: the elastic body comprises a one-way elastic conduit 18, and one side surface of the one-way elastic conduit 18 is provided with a plurality of V-shaped grooves 19 which are transversely arranged at equal intervals along the axial direction of the one-way elastic conduit 18.

The second configuration shown in fig. 10: the elastic body comprises an elastic and elongated spring plate 20 and a bidirectional elastic conduit 21, a plurality of V-shaped grooves 19 which are transversely arranged are uniformly arranged on the two corresponding side surfaces of the bidirectional elastic conduit 21 at intervals along the axial direction of the bidirectional elastic conduit 21, the V-shaped grooves 19 on the two opposite side surfaces of the bidirectional elastic conduit 21 are staggered along the axial direction of the bidirectional elastic conduit 21, and one side surface of the spring plate 20 is coaxially fixed on one side surface of the bidirectional elastic conduit 21, which is provided with the V-shaped grooves 19.

Structure three as shown in fig. 11: the elastic body includes a spring plate 20 having elasticity and a bar shape and a bending spring 22, and one side surface of the spring plate 20 is coaxially fixed to the bending spring 22.

The structure four shown in fig. 12: the elastic body comprises a one-way elastic tube 23, a plurality of spiral elastic grooves 23.1 are uniformly arranged on one side surface of the one-way elastic tube 23 at intervals along the axial direction of the one-way elastic tube, and the spiral elastic grooves 23.1 are groove structures with narrow left and right sides and wide middle.

Be provided with the actuating mechanism mounting groove 1.1 that is used for installing thumb wheel screw rod actuating mechanism along its axial in the pipe handle 1, thumb wheel screw rod actuating mechanism is including coaxial setting in actuating mechanism mounting groove 1.1, screw shaft 10 that has the shaft hole and the thumb wheel 11 with screw shaft 10 threaded connection, set up the breach 12 that supplies manual operation thumb wheel 11 on the pipe handle 1, the laminating of the preceding terminal surface of screw shaft 10 and the rear end face of ring platform 2.3, be provided with between the preceding terminal surface of ring platform 2.3 and the actuating mechanism mounting groove 1.1 internal surface and support and push away spring 13. A gasket 14 coaxial with the first hard sheath pipe 2.1 is fixed on the inner surface of the rear end of the driving mechanism mounting groove 1.1, and the front end surface of the gasket 14 is attached to the rear end surface of the first hard sheath pipe 2.1.

The using method of the invention is as follows: the thumb wheel 11 is rotated, because the front end of the screw shaft 10 is acted by the resisting spring 13, the rear end is tightly contacted with the gasket 14, the friction force between the screw shaft 10 and the gasket 14 is larger than the driving force of the screw shaft 10, so that relative movement is generated between the screw shaft 10 and the thumb wheel 11, the screw shaft 10 can perform axial forward and backward movement, when the screw shaft 10 moves forwards, the front end of the screw shaft 10 abuts against the push ring table 2.3 to enable the hard sheath tube 2 to move forwards and to abut against the elastic body, the front end of the elastic body is acted by the end cap 5, the elastic body can bend towards the fixed direction, the bending angle of the core rod 3 at any position in the appointed bending direction is realized, and the structure of the thumb wheel 11 and the screw shaft 10 has the self-locking characteristic, the mandrel 3 can be self-locked after being bent, when the bending direction of the mandrel 3 needs to be changed, the hard sheath tube 2 is driven to rotate by the knob 6 only by rotating the knob 6, and the bending and the self-locking of the mandrel 3 in the new bending direction can be realized by operating the thumb wheel 11 again.

In the invention, the elastic body can be a part of the end cap 5, a part of the hard sheath tube 2 or an independent part and is respectively connected with the end cap 5 or the hard sheath tube 2 through a clamping groove or other connection modes (arranged according to actual requirements), the elastic section is made of materials with certain elasticity and rigidity, the notches on the elastic section can be opened into V-shaped, Y-shaped, U-shaped, arc-shaped and other shapes, the notches are directly connected without being disconnected or connected together in a hinged mode, the directly connected elastic body has certain elasticity and is convenient for the reset function of the bent catheter, the hinged mode depends on the elasticity of elastic plastic, and the reset capability is different from the direct connection mode. The hard sheath tube 2 can be pushed and pulled axially along the outer circumferential surface of the elastic plastic tube (the core rod 3) under the operation of mechanisms such as a thumb wheel 11, a screw shaft 10 and the like, the elastomer is pushed to form a certain bending moment at the head of the core rod 3, the groove side of the elastomer is compressed under the action of the bending moment to form the bending of the head of the core rod 3, meanwhile, the hard sheath tube 2 can be rotated radially for 360 degrees under the action of a knob 6, so that the position of the groove side of the elastomer on the catheter is changed, and the bending of the head of the catheter in each rotating direction is realized.

As shown in fig. 13, the shape and number of the notches and the lengths of the different segments of the elastic body can be designed according to the requirements of the radius, curvature and radian of the bent catheter, so that the required bent shape can be better fitted, and meanwhile, the more the number of the grooves of the elastic body at the head of the catheter under a certain bending length is, the better the fitting degree of the bent arc is, and the smoother the bending is. Fig. 13 shows ten equally divided elastic bodies, and the sections can be increased or decreased according to the needs, different section lengths can be set, and meanwhile, the elastic body section designed according to the bending curve can realize the conversion from elasticity to rigidity after the catheter is bent to the curve shape, thus being helpful for doctors to design different bending curves according to the actual condition of human body lesion so as to facilitate the operation process. The elastomer can be used as a single replaceable element, which can be selected for different procedures.

In summary, the elastic body replaces the steel wire rope structure in the elastic plastic tube and the snake bone tube, a supporting tube is not needed, the outer diameter of the catheter is reduced, the bent control structure of the catheter is simplified, and the miniaturization of the catheter is realized. The problem of the crooked skew of elasticity plastic pipe direction is solved, the control precision of operation has been improved. The processing precision of elastomer component is high, is favorable to the supplementary of pipe to reset, has solved the elasticity plastic pipe and has reset insufficient problem after the bending.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A directionally curved endoscopic catheter structure comprising a catheter handle (1) and a catheter, characterized in that: the pipe include one end set up in hard sheath pipe (2) and coaxial the inserting in pipe handle (1) plug (3) in hard sheath pipe (2), the front end of plug (3) is including being located hard sheath pipe (2) the place ahead, flexible elasticity pipeline section (3.1), the front end of elasticity pipeline section (3.1) is fixed with end cap (5), end cap (5) with be connected with between the front end of hard sheath pipe (2) and can make elasticity pipeline section (3.1) directional crooked elastomer, be provided with in pipe handle (1) and drive hard sheath pipe (2) axial displacement's thumb wheel screw rod actuating mechanism.

2. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: the front end of catheter handle (1) is provided with knob (6), hard sheath pipe (2) surface is provided with location strip (7) along its axial, seted up in knob (6) with hard sheath pipe (2) complex knob shaft hole (8) and with location strip (7) complex positioning groove (9).

3. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: hard sheath pipe (2) include first hard sheath pipe (2.1) and with the hard sheath pipe (2.2) of the second of the coaxial intercommunication of one end of first hard sheath pipe (2.1), the diameter of the hard sheath pipe of second (2.2) is less than the diameter of first hard sheath pipe (2.1), coaxially be provided with on the surface of first hard sheath pipe (2.1) with thumb wheel screw drive complex ring platform (2.3).

4. A directionally curved endoscopic catheter structure as claimed in claim 3, wherein: be provided with along its axial in pipe handle (1) and be used for the installation thumb wheel screw rod actuating mechanism's actuating mechanism mounting groove (1.1), thumb wheel screw rod actuating mechanism including coaxial set up in actuating mechanism mounting groove (1.1), screw shaft (10) that have the shaft hole and with screw shaft (10) threaded connection's thumb wheel (11), offer on pipe handle (1) and supply manual operation breach (12) of thumb wheel (11), the preceding terminal surface of screw shaft (10) with the rear end face laminating of ring platform (2.3), be provided with in actuating mechanism mounting groove (1.1) and prevent screw shaft (10) pivoted axial is supported and is pushed away the mechanism.

5. A directionally curved endoscopic catheter structure as claimed in claim 4, wherein: the axial pushing mechanism comprises a pushing spring (13) which is coaxially arranged with the first hard sheath tube (2.1) and connected between the front end face of the ring platform (2.3) and the inner surface of the driving mechanism mounting groove (1.1).

6. A directionally curved endoscopic catheter structure as claimed in claim 5, wherein: the rear end inner surface of actuating mechanism mounting groove (1.1) is fixed with spacer (14) coaxial with first hard sheath pipe (2.1), the preceding terminal surface of spacer (14) with the back terminal surface laminating of first hard sheath pipe (2.1).

7. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: the guide pipe comprises a core rod (3) and a guide pipe handle (1), wherein a core rod limiting mechanism which is matched with each other to prevent the core rod (3) from moving forwards and axially is arranged on the core rod (3) and comprises a limiting ring (15) which is coaxially fixed on the surface of the rear end of the core rod (3) and has a diameter larger than that of the core rod (3) and a limiting seat (16) arranged in the guide pipe handle (1), a limiting seat through hole (17) which is matched with the core rod (3) and is used for the core rod (3) to pass through is formed in the limiting seat (16), and the aperture of the limiting seat through hole (17) is smaller than that of the limiting ring (15).

8. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: the elastic body comprises a one-way elastic conduit (18), and a side surface of the one-way elastic conduit (18) is provided with a plurality of V-shaped grooves (19) which are transversely arranged at equal intervals along the axial direction of the one-way elastic conduit (18).

9. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: the elastomer is including spring plate (20) and two-way elasticity pipe (21) that have elasticity, rectangular shape, the both sides surface that corresponds of two-way elasticity pipe (21) is all followed a plurality of transverse arrangement's V type groove (19) are seted up to the even interval of axial of two-way elasticity pipe (21), V type groove (19) on the relative both sides surface of two-way elasticity pipe (21) are followed the axial direction staggered arrangement of two-way elasticity pipe (21), a side surface coaxial fixation of spring plate (20) has seted up two-way elasticity pipe (21) one side of V type groove (19) is on the surface.

10. A directionally curved endoscopic catheter structure as claimed in claim 1, wherein: the elastic body comprises a one-way elastic tube (23), a plurality of spiral elastic grooves (23.1) are uniformly arranged on one side surface of the one-way elastic tube (23) along the axial direction of the one-way elastic tube at intervals, and the spiral elastic grooves (23.1) are of groove structures with narrow left sides and narrow right sides and wide middle parts.