CN113143402B

CN113143402B - Layered fetching catheter

Info

Publication number: CN113143402B
Application number: CN202110362618.2A
Authority: CN
Inventors: 汪威
Original assignee: Taizhou Haoxin Medical Technology Co ltd
Current assignee: Taizhou Haoxin Medical Technology Co ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-06-24
Anticipated expiration: 2041-04-02
Also published as: CN113143402A

Abstract

The invention discloses a layered fetching catheter, which relates to the field of medical instruments, and adopts the technical scheme that the layered fetching catheter comprises a telescopic mechanism, a sleeve and an extracting mechanism which is communicated with the sleeve and controls the telescopic mechanism to radially expand and retract; the telescopic mechanism comprises a plurality of metal wires, the metal wires are of a double-layer structure, and each metal wire is divided into an outer-layer metal wire and an inner-layer metal wire; the telescopic mechanism also comprises a supporting rod for supporting the metal wire to form a claw part structure, wherein the opposite side surfaces of the supporting rod are provided with grooves extending from the top end to one side of the root part, and the inner wall of the supporting rod is provided with a clamping ring capable of moving up and down; the inner layer metal wire penetrates through the clamping ring and extends outwards to form a claw part structure; the extraction mechanism controls the outer layer metal wire and the inner layer metal wire to be in linkage or independent telescopic expansion in a segmented mode, and the clamping ring moves up and down along with the movement of the inner layer metal wire. The technical effect is that the double-basket structure is included, so that the falling of smaller stones can be prevented.

Description

Layered fetching conduit

Technical Field

The invention relates to the field of medical instruments, in particular to a layered fetching catheter.

Background

Common bile duct stones are common diseases and frequently encountered diseases in China, the common bile duct stones blocked by the stones often induce complications such as acute cholangitis, obstructive jaundice, acute cholangic pancreatitis and the like, the symptoms such as chill, fever, abdominal pain, jaundice and the like appear, serious patients even cause shock, and long-term stone stimulation has the risk of bile duct cancer, so the common bile duct stones are important diseases which harm human health.

The fetching catheter is widely applied to the treatment of the disease with calculus in different operation fields of urinary surgery, biliary tract and the like, is a common medical instrument for carrying out ERCP (endoscopic cholangiopancreatography) operations such as biliary calculus fetching and the like, and is often used for fetching larger broken stone.

At present, chinese patent with publication number CN 205411257U discloses a disposable ureter fetching catheter, which comprises a control end and a working end, wherein the control end comprises a control handle and a push-pull handle which is slidably arranged in a chute of the control handle and can be freely pushed and pulled, the working end comprises a basket and a basket tube body fixedly connected to the outer end of the push-pull handle, the basket is a headless basket, the top of the basket is arc-shaped, and the tail ends of all basket wires pass through the basket tube body and the inner cavity of the push-pull handle through a pull rope and are fixedly connected to the control handle.

Although the disposable ureter fetching catheter can complete the calculus fetching operation, the gap of the endless net basket is large, and the disposable ureter fetching catheter can only be used for fetching larger crushed stones, and the crushed stones with small particle sizes are easy to miss.

Disclosure of Invention

The invention aims to provide a layered fetching catheter which comprises multiple structures and can prevent small stones from falling off.

The technical purpose of the invention is realized by the following technical scheme:

a layered fetching catheter comprises a telescopic mechanism, a sleeve and an extracting mechanism communicated with the sleeve to control the telescopic mechanism to radially expand and retract, wherein the telescopic mechanism comprises a plurality of metal wires, the metal wires are of a double-layer structure, and each metal wire is divided into an outer-layer metal wire and an inner-layer metal wire; the sleeve comprises an outer layer central channel and an inner layer moving tube, one end of each of the outer layer metal wire and the inner layer metal wire is fixed on the central channel, and the other end of each of the outer layer metal wire and the inner layer metal wire is fixed on the moving tube;

the telescopic mechanism also comprises a support rod for supporting the metal wire to form a claw part structure, wherein the opposite side surfaces of the support rod are provided with grooves extending from the top end to one side of the root part, and the inner wall of the support rod is provided with a clamping ring capable of moving up and down; the inner layer metal wire penetrates through the clamping ring and extends outwards to form a claw part structure;

the extraction mechanism controls the outer layer metal wire and the inner layer metal wire to be in linkage or independent telescopic expansion in a segmented mode, and the clamping ring moves up and down along with the movement of the inner layer metal wire.

Through adopting above-mentioned technical scheme, when outer wire and inlayer wire coincide, get the thing pipe and can effectually snatch some great calculi of volume, and when the inlayer wire inwards removed alone, can form double-deck basket structure, when the outer wire guarantees the stone scope of getting the most promptly, the clearance is filled to the inlayer wire, and under the fixed action of snap ring, can adjust the clearance between outer wire and the inlayer wire at any time, make it adapt to the different stone circumstances of getting more, for example, the basket width of individual layer gets the thing pipe is 15-25mm usually, be less than 5 mm's tiny calculus to the particle diameter, the very easy clearance through the basket that slides down, and bilayer structure in this application, the capture particle diameter that can be fine is less than 5 mm's tiny calculus.

Further setting: the movable tube comprises a base inner cavity and a second inner cavity which can move in relative positions; one end of the outer layer metal wire is fixed on the base inner cavity, the other end of the outer layer metal wire is fixed on the central channel, one end of the inner layer metal wire is fixed on the second inner cavity, and the other end of the inner layer metal wire is fixed on the central channel.

By adopting the technical scheme, the movement of the inner layer metal wire and the outer layer metal wire is separated, the outer layer metal wire is driven to contract or expand when the base inner cavity is pushed, and the inner layer metal wire is driven to contract or expand when the second inner cavity is pushed, so that the interference between the outer layer metal wire and the inner layer metal wire is avoided.

Further setting: the clamping ring is connected to the second inner cavity, and when the second inner cavity moves up and down, the clamping ring slides simultaneously; and a slide way is arranged at the joint of the clamping ring and the supporting rod.

Through adopting above-mentioned technical scheme, the snap ring can make the inlayer wire can stop in arbitrary one position, and no matter the inlayer wire stops in which position the snap ring can both support the inlayer wire and make it keep good grabbing power.

Further setting: the extraction mechanism comprises a main pushing assembly and a secondary control piece, the main pushing assembly is in linear twitching linkage with the outer-layer metal wire and the inner-layer metal wire to synchronously expand or retract, a linkage device connected with the second inner cavity is arranged on the secondary control piece, and the linkage device controls the inner-layer metal wire to radially expand or retract.

Through adopting above-mentioned technical scheme, main pushing assembly control outer layer wire and inlayer wire move simultaneously, and secondary control piece changes the relative position of inlayer wire and then change outer layer wire and inlayer wire through aggregate unit radial expansion or withdrawal.

Further setting: the linkage device comprises a flexible part attached to a gap between the base inner cavity and the second inner cavity, a filling cavity arranged at the bottom of the secondary control part, and a connecting pipe for connecting the flexible part and the filling cavity; the filling cavity is squeezed by pressing the secondary control part, so that the flexible part is in an expansion or contraction state, and the second inner cavity is driven to move by the movement of the secondary control part.

By adopting the technical scheme, when the secondary control part is pressed downwards, the gas in the filling cavity enters the flexible part through the connecting pipe, and the flexible part expands; when the secondary control member is restored to the original position, the gas returns to the filling cavity, the flexible member is compressed, and the relative positions of the outer layer metal wire and the inner layer metal wire are changed through the volume change of the flexible member.

Further setting: the base inner cavity is provided with a sliding groove, the position of the sliding groove is the same as that of the linkage device, when the flexible part expands, the flexible part is fixed in the sliding groove, so that the second inner cavity and the base inner cavity do not move relatively, and when the flexible part contracts, the relative position of the second inner cavity and the base inner cavity changes.

Through adopting above-mentioned technical scheme, when the inside gas or other materials of packing of flexible piece, the flexible piece is the inflation state, can make basic inner chamber and second inner chamber not take place relative movement under the inflation state, but when the flexible piece shrink, it can not fix in the spout to thereby can take place relative movement in the spout and drive the relative position change of basic inner chamber and second inner chamber.

Further setting: and a clamping strip for driving the second inner cavity to move is arranged at the bottom of the basic inner cavity.

Through adopting above-mentioned technical scheme, the card strip can make main promotion subassembly can make basic inner chamber and second inner chamber take place to remove simultaneously.

Further setting: the near end of the extracting mechanism close to the telescopic mechanism is provided with a sliding rod, the sliding rod is in contact connection with the main pushing assembly, and the sleeve penetrates through the sliding rod and is fixed at one end of the extracting mechanism far away from the telescopic mechanism.

Through adopting above-mentioned technical scheme, the removal of main promotion subassembly drives the slide bar axial and reciprocates to make the removal pipe in the sleeve pipe remove, strengthened the thrust to removing the pipe.

Further setting: the bottom end of the sleeve is provided with a protective clamping sleeve, and the bottom end of the sleeve is fixed on the protective clamping sleeve.

By adopting the technical scheme, the protective sleeve can protect the sleeve from collision or friction with the outside when moving, so that the loss of the sleeve is avoided; meanwhile, the buffer function is realized when the moving pipe moves to collide with the sliding rod.

Further setting: the metal wire is made of memory alloy.

Through adopting above-mentioned technical scheme, can prevent effectively that basket silk from warping, guarantee simultaneously that basket silk can form fixed shape, conveniently get stone control.

In conclusion, the invention has the following beneficial effects: when outer wire and inlayer wire coincide, get the thing pipe and can effectually snatch some great calculi of volume, and when inlayer wire inwards removed alone, can form double-deck basket structure, when outer wire guarantees the biggest stone scope of getting promptly, the clearance is filled to the inlayer wire, and under the fixed action of snap ring, can adjust the clearance between outer wire and the inlayer wire at any time, it gets the stone condition to make it adapt to the difference more, for example, the basket width of individual layer getting the thing pipe is 15-25mm usually, tiny calculus to the particle diameter is less than 5mm, the clearance through the basket very easily slips, and bilayer structure in this application, the tiny calculus that the seizure particle diameter that can be fine is less than 5 mm.

Drawings

FIG. 1 is a schematic view of the overall structure of a stratified water extraction conduit;

FIG. 2 is a schematic view of the structure of the support rods in the layered water pick-up conduit;

FIG. 3 is a schematic view of the structure of the telescoping mechanism in the layered water fetching conduit;

FIG. 4 is a schematic view of the structure of the extraction mechanism in the stratified water extraction conduit;

in the figure, the position of the upper end of the main shaft,

1. a telescoping mechanism; 2. a sleeve; 3. an extraction mechanism; 4. a metal wire; 5. an outer layer of wire; 6. an inner layer of wire; 7. a central channel; 8. moving the tube; 9. a support bar; 10. a groove; 11. a snap ring; 12. a base lumen; 13. a second lumen; 14. a slideway; 15. a main push assembly; 16. a secondary control; 17. a linkage device; 18. a flexible member; 19. filling the cavity; 20. connecting pipes; 21. a chute; 22. clamping the strip; 23. a slide bar; 24. protecting the card sleeve; 25. a top end cap; 26. a bottom cap.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

First preferred embodiment:

a layered fetching catheter is shown in figure 1 and comprises a telescopic mechanism 1, a sleeve 2 and a fetching mechanism 3 which is connected with the sleeve 2 and controls the telescopic mechanism 1 to expand and retract radially.

As shown in fig. 2, the telescoping mechanism 1 includes a plurality of metal wires 4, and the metal wires 4 are of a double-layer structure, the metal wires 4 are made of memory alloy, the initial fixed shape is an inverted triangle, the metal wires 4 are closed to form a bar shape, and the metal wires 4 can automatically recover to the shape of the blade when being expanded to perform subsequent stone removal. The wire 4 is divided into a fixed wire 4 portion and a movable wire 4 portion, and the wire 4 is controlled to expand or contract by the positional movement of the movable wire 4 portion. The double-layered structure of the wire 4 includes an outer layer wire 5 and an inner layer wire 6.

The sleeve 2 comprises an outer central passage 7 and an inner moving pipe 8, the outer central passage 7 is fixed, the inner moving pipe 8 is divided into a basic inner cavity 12 and a second inner cavity 13, the central passage 7 and the moving pipe 8 are concentric sleeves 2, and the relative positions of the basic inner cavity 12 and the second inner cavity 13 can be moved. One end of the outer layer metal wire 5 is fixed on the base inner cavity 12, the other end is fixed on the central channel 7, one end of the inner layer metal wire 6 is fixed on the second inner cavity 13, and the other end is fixed on the central channel 7.

Telescopic machanism 1 is still including the bracing piece 9 that supports wire 4, bracing piece 9 makes the lower tip of wire 4 be the straight line, strengthen telescopic machanism 1's the power of grabbing, and one side of bracing piece 9 is equipped with the decurrent recess 10 that matches with inlayer wire 6, when needs get the thing pipe and change into bilayer structure, inlayer wire 6 shrink, inlayer wire 6 is downward along recess 10 during the shrink, but other parts of bracing piece 9 still can produce supporting role to inlayer wire 5, mutual interference between when having avoided inside and outside layering.

The inner wall of the supporting rod 9 is provided with a clamping ring 11 capable of moving up and down, the clamping ring 11 comprises a sliding section moving on the inner wall of the supporting rod 9 through a slide way 14 and an annular fixed section penetrated by the inner layer metal wire 6, and the position of the fixed section corresponds to the position of the groove 10. The snap ring 11 is coupled to the second inner chamber 13 to slide simultaneously with the up and down movement of the second inner chamber 13.

The snap ring 11 enables the inner layer wire 6 to stay at any one position, and the snap ring 11 can support the inner layer wire 6 to maintain a good gripping force regardless of the position at which the inner layer wire 6 stays.

As shown in fig. 2 and 3, the relative position movement of the base lumen 12 and the second lumen 13 is realized by the extraction mechanism 3, and the extraction mechanism 3 controls the outer layer wire 5 and the inner layer wire 6 to be linked or expanded telescopically independently in a subsection manner.

The extraction mechanism 3 comprises a main pushing assembly 15 and a secondary control piece 16, the main pushing assembly 15 linearly draws and links the outer-layer metal wire 5 and the inner-layer metal wire 6 to synchronously expand or retract, a linkage device 17 connected with the second inner cavity 13 is arranged on the secondary control piece 16, and the linkage device 17 controls the inner-layer metal wire 6 to radially expand or retract. The linkage 17 comprises a flexible member 18 attached to the gap between the base inner cavity 12 and the second inner cavity 13, a filling cavity 19 arranged at the bottom of the secondary control member 16, and a connecting pipe 20 connecting the flexible member 18 and the filling cavity 19; the flexible element 18 is brought into an expanded or contracted state by pressing the secondary control element 16 to squeeze the filling cavity 19. The base cavity 12 is provided with a sliding groove 21 which has the same position as the linkage 17, when the flexible member 18 expands, the flexible member 18 is fixed in the sliding groove 21 so that the second cavity 13 and the base cavity 12 do not move relatively, and when the flexible member 18 contracts, the relative position of the second cavity 13 and the base cavity 12 changes. The base inner cavity 12 and the bottom are provided with a clamping strip 22 for driving the second inner cavity 13 to move.

The main pushing assembly 15 controls the outer layer metal wire 5 and the inner layer metal wire 6 to move simultaneously, and the secondary control member 16 changes the radial expansion or retraction of the inner layer metal wire 6 through the linkage device 17 so as to change the relative positions of the outer layer metal wire 5 and the inner layer metal wire 6; when the secondary control member 16 is pressed down, the gas in the filling chamber 19 enters the flexible member 18 through the connecting tube 20, and the flexible member 18 expands; when the secondary control member 16 is restored, the gas is returned to the filling chamber 19 and the flexible member 18 is compressed.

As shown in fig. 4, the proximal end of the extracting mechanism 3 close to the telescoping mechanism 1 is provided with a sliding rod 23, the cannula 2 passes through the sliding rod 23 and is fixed at one end of the extracting mechanism 3 close to the telescoping mechanism 1, the end of the sliding rod 23 close to the telescoping mechanism 1 is provided with a top cap 25, and the end of the extracting mechanism 3 far away from the telescoping mechanism 1 is provided with a bottom cap 26. The top end cap 25 ensures that the protective sleeve 24 and the sliding rod 23 are always in contact connection, thereby ensuring that the sleeve 2 can make a reciprocating movement towards and away from the extraction mechanism 3.

The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.

Claims

1. The utility model provides a thing pipe is got to layering, includes telescopic machanism (1), sleeve pipe and intercommunication sleeve pipe (2) control telescopic machanism (1) radially expand and the mechanism (3) of drawing that retracts which characterized in that: the telescopic mechanism (1) comprises a plurality of metal wires (4), the metal wires (4) are of a double-layer structure, and each metal wire (4) is divided into an outer-layer metal wire (5) and an inner-layer metal wire (6); the sleeve (2) comprises an outer layer central channel (7) and an inner layer moving tube (8), one end of the outer layer metal wire (5) and one end of the inner layer metal wire (6) are fixed on the central channel (7), and the other end of the outer layer metal wire and the other end of the inner layer metal wire are fixed on the moving tube (8);

the telescopic mechanism (1) further comprises a support rod (9) which supports the metal wire (4) to form a claw part structure, grooves (10) which extend from the top end to one side of the root part are formed in opposite side faces of the support rod (9), and a clamping ring (11) which can move up and down is arranged on the inner wall of the support rod (9); the inner layer metal wire (6) penetrates through the clamping ring (11) and extends outwards to form a claw part structure;

the extraction mechanism (3) controls the outer layer metal wire (5) and the inner layer metal wire (6) in a segmented mode or extends and contracts independently, and the clamping ring (11) moves up and down along with the movement of the inner layer metal wire (6).

2. The layered extraction conduit according to claim 1, wherein: the moving tube (8) comprises a base inner cavity (12) and a second inner cavity (13) which can move in relative positions; one end of the outer layer metal wire (5) is fixed on the base inner cavity (12), the other end of the outer layer metal wire is fixed on the central channel (7), one end of the inner layer metal wire (6) is fixed on the second inner cavity (13), and the other end of the inner layer metal wire is fixed on the central channel (7).

3. The layered extraction conduit according to claim 2, wherein: the clamping ring (11) is connected to the second inner cavity (13) and slides when the second inner cavity (13) moves up and down; and a slide way (14) is arranged at the joint of the clamping ring (11) and the supporting rod (9).

4. The layered extraction conduit according to claim 2, wherein: the extraction mechanism (3) comprises a main pushing assembly (15) and a secondary control piece (16), the main pushing assembly (15) is in linear twitching linkage with the outer layer metal wire (5) and the inner layer metal wire (6) to be synchronously expanded or retracted, a linkage device (17) connected with the second inner cavity (13) is arranged on the secondary control piece (16), and the linkage device (17) controls the inner layer metal wire (6) to be radially expanded or retracted.

5. The layered extraction conduit according to claim 4, wherein: the linkage device (17) comprises a flexible part (18) attached to the gap between the base inner cavity (12) and the second inner cavity (13), a filling cavity (19) arranged at the bottom of the secondary control part (16), and a connecting pipe (20) for connecting the flexible part (18) and the filling cavity (19); the flexible element (18) is brought into an expanded or contracted state by pressing the secondary control element (16) to squeeze the filling cavity (19), the second inner cavity (13) being moved by the movement of the secondary control element (16).

6. The layered extraction conduit according to claim 5, wherein: the base inner cavity (12) is provided with a sliding groove (21) with the same position as the linkage device (17), when the flexible part (18) expands, the flexible part (18) is fixed in the sliding groove (21) to enable the second inner cavity (13) and the base inner cavity (12) not to move relatively, and when the flexible part (18) contracts, the relative position of the second inner cavity (13) and the base inner cavity (12) changes.

7. The layered extraction conduit according to claim 6, wherein: and a clamping strip (22) for driving the second inner cavity (13) to move is arranged at the bottom of the basic inner cavity (12).

8. The layered extraction conduit according to claim 4, wherein: the near end of the extracting mechanism (3) close to the telescopic mechanism (1) is provided with a sliding rod (23), the sliding rod (23) is in contact connection with the main pushing assembly (15), and the sleeve (2) penetrates through the sliding rod (23) to be fixed at the end of the extracting mechanism (3) far away from the telescopic mechanism (1).

9. The layered extraction conduit according to claim 1, wherein: the bottom end of the sleeve (2) is provided with a protective clamping sleeve (24), and the bottom end of the sleeve (2) is fixed on the protective clamping sleeve (24).

10. The layered extraction conduit according to claim 1, wherein: the metal wire (4) is made of memory alloy.