CN217310508U - Injection needle for endoscope - Google Patents

Abstract

The utility model provides an injection needle for endoscope, including inner tube, outer tube, front handle, back handle and buckle, outer tube front end inner wall has the location sunken according to locating hole interval distribution along the outer tube axial, and outer tube front end swing joint has the guide head, and guide head front end external diameter is greater than the needle tubing external diameter, and the guide head tail end then elastic deformation and with the sunken joint cooperation in location. The utility model provides a pair of injection needle for endoscope, structural design is reasonable, through the design of guide head, when narrow position injection, can release the guide head forward, and the guide head of being convenient for provides effectual wide division support in injection needle circumference, and trafficability characteristic is good, and the security is high, and the difficult fish tail of syringe needle is human, effectively reduces the incidence of complication.

Description

Injection needle for endoscope

Technical Field

The utility model relates to the technical field of medical equipment, in particular to an endoscope consumable instrument, in particular to a syringe needle for an endoscope.

Background

With the development of society and the increasing living standard of people, patients with esophageal and gastric varices caused by various reasons are more common. Currently, the sclerosing agent injection needle is usually adopted for treatment clinically. A conventional endoscopic injection needle is generally shown in CN206103106U, which is a disposable endoscopic injection needle.

The syringe needle that this patent was disclosed has controlled the length that the syringe needle stretches out though the spacing cooperation of back handle and preceding handle, and the accuracy of the injection depth is controllable when guaranteeing the injection to handle dislocation when preventing to pull back the syringe needle has effectively guaranteed operation quality and patient safety. However, in a too narrow position in a human body, the front end and the circumferential position of the needle head extending out of the outer tube are too narrow, so that misoperation such as inaccurate needle head positioning, scratching of the human body and the like is easily caused. The existing injection needle can not be used for injection operation at a too narrow position in a human body, so that the injection needle needs to be designed to solve the problem that the extending length of a needle point is not influenced, and meanwhile, the injection needle has good passing property, high safety and low occurrence rate.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to overcome the deficiency of the prior art, the utility model provides a structural design is reasonable, effectively guides at the outer tube front end, and the syringe needle that the needle tubing of being convenient for carries out the injection in narrow position department.

The utility model provides a technical scheme that its technical problem adopted is: a kind of injection needle for endoscope, including inner tube, outer tube, front hand grip, rear hand grip and buckle, the said inner tube front end is fixed with the needle tubing, the rear end of inner tube is connected with front end of rear hand grip, the said outer tube is wrapped up in and set up in the periphery of inner tube and the rear end of outer tube is connected with front end of front hand grip, the said front hand grip is hollow inside, and open several locating holes along its axial direction, the said rear hand grip front end stretches into the front hand grip, and have buckles cooperating with locating hole to block on the rear hand grip; the inner wall of the front end of the outer pipe is provided with positioning depressions at intervals along the axial direction of the outer pipe according to the positioning holes, the front end of the outer pipe is movably connected with a guide head, and the tail end of the guide head is clamped and matched with the positioning depressions.

In the scheme, through the design of the guide head, the guide head can be ejected out when the injection device is used, the circumferential outer side of the needle tube is supported and expanded, and injection at a narrow position is facilitated.

Furthermore, outer tube front end inner wall circumference stopping cooperation joint have a registration arm, the location sunken setting at the registration arm inner wall.

Furthermore, the periphery of the positioning tube is protruded with wedge-shaped protrusions distributed at intervals, and the wedge-shaped protrusions are in interference fit with the inner wall of the front end of the outer tube.

Preferably, in order to facilitate the ejection of the guide head, the guide head comprises a guide head part and a guide tube fixed on the rear end face of the guide head part, the guide head part is of a hemispherical structure protruding relative to the front end of the outer tube, the diameter of the end face of the hemispherical structure is larger than the inner diameter of the front end of the positioning tube, the guide tube is fixed on the end face, the outer diameter of the front end of the guide tube is smaller than the inner diameter of the positioning tube, the tail part of the guide tube is expanded outwards in the circumferential direction and is provided with an outer expansion wing, the outer expansion wing is in interference fit with the inner wall of the positioning tube, and the outer expansion wing is in fit clamping connection with the positioning recess after elastic deformation occurs when the positioning head and the positioning tube move in the radial direction.

Furthermore, in order to facilitate the connection of the needle head and the inner tube and the ejection of the guide head, the injection needle further comprises a butt joint tube, the inner wall of the front end of the butt joint tube is fixed with the outer wall of the rear end of the needle tube, the rear end of the butt joint tube is fixed with the inner wall of the front end of the inner tube, the outer diameter of the front end face of the butt joint tube is larger than the minimum inner diameter of the tail part of the guide tube at the outer expansion wing, and the outer diameter of the front end of the inner tube is smaller than the inner diameter of the positioning tube.

Furthermore, in order to effectively push out the guide head and simultaneously facilitate the guide head to be matched with the positioning recess for limitation, the outward-expanding wing is of an outward-expanding extension foot structure which is reversed and gradually expands circumferentially relative to the forward pushing direction of the needle tube, and the positioning recess is provided with guide inclined planes corresponding to the end faces of the two sides of the forward or backward movement direction of the needle tube.

Further, the buckle includes bellying and control part, the bellying under the control of control part with locating hole joint cooperation.

Furthermore, in order to effectively operate the ejection length of the needle tube at the handle and control the ejection length of the guide head at the same time, at least three positioning holes are distributed on the front handle at intervals along the axial length direction of the front handle, the needle tip does not protrude out of the positioning holes, the needle tip normally extends out of the positioning holes from back to front, and the rest is the front end of the needle tip extends out of the positioning holes; the number of the positioning depressions along the axial length of the positioning tube is equal to the number of the positioning holes extending from the front end of the needle point.

The beneficial effects of the utility model are that, the utility model provides a pair of syringe needle for endoscope, structural design is reasonable, through the guide head design, when narrow position injection, can release the guide head forward, and the guide head of being convenient for provides effectual wide open support in syringe needle circumference, and trafficability characteristic is good, and the security is high, and the syringe needle is difficult for the fish tail human body, effectively reduces the incidence of complication.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the preferred embodiment of the present invention.

Fig. 2 is an enlarged sectional view at a in fig. 1.

FIG. 3 is an enlarged sectional view of the needle cannula at A in FIG. 1.

FIG. 4 is an enlarged sectional view of the needle cannula shown in FIG. 1 at A in an extended state.

Fig. 5 is a schematic structural view of the rear handle in the preferred embodiment of the present invention.

Fig. 6 is an enlarged schematic view at B in fig. 2.

In the drawing, the device comprises a handle 1, a rear handle 2, a connecting pipe 3, a front handle 3-1, a needle point without a positioning hole 3-2, a needle point normally extending out of the positioning hole 3-3, a first needle point front end extending out of the positioning hole 3-4, a second needle point front end extending out of the positioning hole 4, a protective sleeve 5, an outer pipe 6, an inner pipe 7, a positioning pipe 7-1, a positioning recess 7-2, a wedge-shaped bulge 8, a guide head 8-1, a guide head 8-2, a guide pipe 8-3, an external expanding wing 9, a needle tube 10, a buckle 10-1, a bulge 10-2, a control part 11 and a butt joint pipe.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the invention only in a schematic way, and thus show only the components that are relevant to the invention, and the directions and references (e.g., upper, lower, left, right, etc.) may be used only to help describe the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

An injection needle for an endoscope shown in fig. 1 to 5 is a preferred embodiment of the present invention, and includes an inner tube 6, an outer tube 5, a front handle 3, a rear handle 1, and a clip 10. The front end of the inner tube 6 is fixed with a needle tube 9 through a butt joint tube 11, the outer tube 5 is wrapped on the periphery of the inner tube 6, and the rear end of the outer tube 5 is connected with the front end of the front handle 3. The front end of the rear handle 1 is provided with a connecting pipe 2, the connecting pipe 2, and the front end is connected with the rear end of an inner pipe 6.

As shown in figure 1, the front handle 3 is hollow and is provided with four positioning holes along the axial direction, and the needle tip does not protrude out of the positioning hole 3-1, the needle tip normally extends out of the positioning hole 3-2, the front end of the first needle tip extends out of the positioning hole 3-3 and the front end of the second needle tip extends out of the positioning hole 3-4 respectively from back to front. The front end of the rear handle 1 extends into the front handle 3, a buckle 10 matched and clamped with the positioning hole is arranged on the rear handle 1, the buckle 10 comprises a convex part 10-1 and a control part 10-2, and the convex part 10-1 is matched with the positioning hole in a clamping manner under the control of the control part 10-2.

As shown in fig. 2 and 6, the positioning tube 7 is clamped on the inner wall of the front end of the outer tube 5 in a circumferential stopping fit manner, the outer circumferential surface of the positioning tube 7 is protruded with wedge-shaped protrusions 7-2 distributed at intervals, and the wedge-shaped protrusions 7-2 are in interference fit with the inner wall of the front end of the outer tube 5. And positioning depressions 7-1 are distributed on the inner wall of the positioning tube 7 along the axial direction of the outer tube 5 at intervals corresponding to the positioning holes 3-3 extending from the front end of the first needle point and the positioning holes 3-4 extending from the front end of the second needle point respectively. The front end of the positioning tube 7 is movably connected with a guide head 8. The guide head 8 comprises a guide head part 8-1 and a guide tube 8-2 fixed on the rear end face of the guide head part 8-1, the guide head part 8-1 is in a semi-spherical structure protruding relative to the front end of the outer tube 5, the diameter of the end face of the semi-spherical structure is larger than the inner diameter of the front end of the positioning tube 7, and in order to facilitate the extension of the needle tube 9, a hole pattern can be correspondingly formed on the semi-spherical structure. The guide tube 8-2 is fixed on the end face, the outer diameter of the front end of the guide tube 8-2 is smaller than the inner diameter of the positioning tube 7, the tail part of the guide tube 8-2 is circumferentially and outwardly expanded and provided with an outward expansion wing 8-3, the outward expansion wing 8-3 is in interference fit with the inner wall of the positioning tube 7, and the outward expansion wing 8-3 is in fit clamping connection with the positioning recess 7-1 after being elastically deformed when the positioning head and the positioning tube 7 move in the radial direction.

The inner wall of the front end of the butt joint pipe 11 is fixed with the outer wall of the rear end of the needle tube 9, the rear end of the butt joint pipe 11 is fixed with the inner wall of the front end of the inner pipe 6, the outer diameter of the front end face of the butt joint pipe 11 is larger than the minimum inner diameter of the tail outward-expanding wing 8-3 of the guide pipe 8-2, the outer diameter of the front end of the inner pipe 6 is smaller than the inner diameter of the positioning pipe 7, when the inner pipe 6 is pushed forwards, the front end face of the butt joint pipe 11 is in pressure joint with the circumferential direction of the minimum inner diameter of the tail outward-expanding wing 8-3 of the guide pipe 8-2, when the forward pushing is continued, the guide pipe 8-2 is pushed forwards, the outward-expanding wing 8-3 is deformed under stress until the circumferential outer end of the outward-expanding wing 8-3 reaches the positioning recess 7-1, the outward-expanding wing 8-3 is elastically restored, and the circumferential outer end of the outward-expanding wing 8-3 is clamped into the positioning recess 7-1.

When the convex part 10-1 is positioned at the needle point and is not positioned in the positioning hole 3-1, the front end of the needle tube 9 is positioned in the outer tube 5, and the front end of the butt joint tube 11 is not contacted with the tail end of the guide tube 8-2. When the convex part 10-1 is positioned at the position where the needle tip normally extends out of the positioning hole 3-2, the front end of the needle tube 9 extends out of the outer tube 5 according to the normal length, and the front end of the butt joint tube 11 does not apply pressure to the tail end of the guide tube 8-2.

Referring to fig. 1 and 4, in the present embodiment, the front handle 3 is provided with a first needle tip front end protruding positioning hole 3-3 and a second needle tip front end protruding positioning hole 3-4, and the positioning tube 7 is correspondingly provided with two sets of positioning recesses 7-1, wherein the positioning recess 7-1 near the front end of the outer tube 7 corresponds to the second needle tip front end protruding positioning hole 3-4, and the positioning recess 7-1 near the rear end of the outer tube 7 corresponds to the first needle tip front end protruding positioning hole 3-3.

As shown in FIG. 3, when the convex portion 10-1 is located at the position where the front end of the first needle point extends out of the positioning hole 3-3, the positioning head is pushed forward, and the outward-expanding wing 8-3 is in fit clamping connection with the positioning recess 7-1 corresponding to the position where the front end of the first needle point extends out of the positioning hole 3-3. As shown in FIG. 4, when the convex portion 10-1 is located at the position where the front end of the second needle point extends out of the positioning hole 3-4, the positioning head is continuously pushed forward, and the outward-expanding wing 8-3 is in matched clamping connection with the positioning recess 7-1 corresponding to the position where the front end of the second needle point extends out of the positioning hole 3-4.

In actual design, the shape of the flaring wings 8-3 and the shape of the positioning recesses 7-1 can be preferably designed. The outer expansion wings 8-3 can be designed into an outer expansion foot structure, the outer expansion foot structure is reversed relative to the forward pushing direction of the needle tube 9 and gradually expands in the circumferential direction, namely the outer diameter of the tail end of the outer expansion foot structure is larger than the inner diameter of the positioning tube 7, and the outer diameter of the front end of the outer expansion foot structure is smaller than the inner diameter of the positioning tube 7, so that the outer expansion foot is conveniently matched and clamped with the positioning recess 7-1 when the guide head 8 moves forward, and certain positioning and limiting operation is carried out. Meanwhile, the end faces of the two sides of the positioning recess 7-1 corresponding to the forward or backward movement direction of the needle tube 9 are provided with guide inclined planes. The design of the guide inclined plane facilitates the tail end of the extension foot to elastically compress along the guide inclined plane in the positioning process of the extension foot, facilitates the extension from the front end of the previous needle point to extend out of the positioning hole to be extruded, contracted and separated, and provides convenience for entering the front end of the next needle point to extend out of the positioning hole.

The syringe needle structural design that this embodiment provided is reasonable, and assembling process convenient and fast, current assembling process is as follows:

1. welding the rear end of the needle tube 9 with the front end of the butt joint tube 11;

2. the front end of the connecting pipe 2 of the rear handle 1 is connected with the rear end of the inner pipe 6, and the front end of the inner pipe 6 is connected with the rear end of the butt joint pipe 11;

3. the front handle 3 is connected with the outer tube 5 and a protective sleeve 4 is sleeved at the connecting position;

4. penetrating the semi-finished product of the rear handle 1 into the semi-finished product of the front handle 3;

5. the positioning tube 7 is penetrated into the front end of the outer tube 5, and then the guide head 8 is penetrated into the positioning tube 7 from the front end of the positioning tube 7;

6. the front handle 3 is provided with a buckle 10 corresponding to the position of the positioning hole on the rear handle 1.

In use, the external tube 5 is unfolded and straightened for insertion into the endoscope, and the external tube 5 is inserted into a predetermined injection site. Before inserting and withdrawing the endoscope and after using and injecting, the needle tube 9 is driven to be recovered into the outer tube 5 by moving relative to the front handle 3 through the buckle 10 and the rear handle 1, so that the endoscope is prevented from being damaged by the scratch of the needle tube 9. Through the design of guide head 8 and butt joint pipe 11, when narrow position injection, the accessible is to butt joint pipe 11 with guide head 8 forward release, is convenient for guide head 8 and provides effectual wide open support in syringe needle circumference, and trafficability characteristic is good, and the security is high, and the difficult fish tail of syringe needle is human, effectively reduces the incidence of complication.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The utility model provides an injection needle for endoscope, includes inner tube (6), outer tube (5), front handle (3), rear handle (1) and buckle (10), inner tube (6) front end is fixed with needle tubing (9), and inner tube (6) rear end is connected with rear handle (1) front end, outer tube (5) outsourcing sets up and is connected its characterized in that at inner tube (6) periphery and outer tube (5) rear end and front handle (3) front end: the front handle (3) is hollow, a plurality of positioning holes are formed in the axial direction of the front handle, the front end of the rear handle (1) extends into the front handle (3), and a buckle (10) matched and clamped with the positioning holes is arranged on the rear handle (1);

the inner wall of the front end of the outer tube (5) is provided with positioning depressions (7-1) at intervals along the axial direction of the outer tube (5) according to positioning holes, the front end of the outer tube (5) is movably connected with a guide head (8), and the tail end of the guide head (8) is in clamping fit with the positioning depressions (7-1).

2. An injection needle for an endoscope according to claim 1, characterized in that: the positioning pipe (7) is clamped on the circumferential stopping matching clamp of the inner wall of the front end of the outer pipe (5), and the positioning recess (7-1) is formed in the inner wall of the positioning pipe (7).

3. An injection needle for an endoscope according to claim 2, characterized in that: the positioning pipe (7) is provided with wedge-shaped bulges (7-2) at intervals in a protruding mode on the outer peripheral surface, and the wedge-shaped bulges (7-2) are in interference fit with the inner wall of the front end of the outer pipe (5).

4. An injection needle for an endoscope according to claim 2, characterized in that: the guide head (8) comprises a guide head part (8-1) and a guide pipe (8-2) fixed on the rear end surface of the guide head part (8-1), the guide head part (8-1) is in a semi-sphere structure protruding relative to the front end of the outer pipe (5), the diameter of the end surface of the semi-sphere structure is larger than the inner diameter of the front end of the positioning tube (7), the guide tube (8-2) is fixed on the end surface, the outer diameter of the front end of the guide tube (8-2) is smaller than the inner diameter of the positioning tube (7), the tail part of the guide tube (8-2) is circumferentially and outwardly expanded and provided with an outwardly expanded wing (8-3), the outwardly expanded wing (8-3) is in interference fit with the inner wall of the positioning tube (7), and the outward-expanding wing (8-3) is clamped with the positioning recess (7-1) in a matching way after being elastically deformed when the positioning head and the positioning pipe (7) move in the radial direction.

5. An endoscopic injection needle according to claim 4, wherein: still include butt joint pipe (11), butt joint pipe (11) front end inner wall is fixed with needle tubing (9) rear end outer wall, and butt joint pipe (11) rear end is fixed with inner tube (6) front end inner wall, butt joint pipe (11) preceding terminal surface external diameter is greater than guide tube (8-2) afterbody and expands the minimum internal diameter of wing (8-3) department outward, inner tube (6) front end external diameter is less than registration arm (7) internal diameter.

6. An endoscopic injection needle according to claim 4, wherein: the outward-expanding wing (8-3) is of an outward-expanding foot structure which is opposite to the forward pushing direction of the needle tube (9) and gradually expands circumferentially, and the positioning recess (7-1) is provided with guide inclined planes corresponding to the end faces of the two sides of the forward or backward movement direction of the needle tube (9).

7. An injection needle for an endoscope according to claim 1, characterized in that: the buckle (10) comprises a protruding part (10-1) and a control part (10-2), and the protruding part (10-1) is in clamping fit with the positioning hole under the control of the control part (10-2).

8. An injection needle for an endoscope according to claim 1, characterized in that: at least three positioning holes are distributed on the front handle (3) at intervals along the axial length direction of the front handle, the needle tip does not extend out of the positioning hole (3-1), the needle tip normally extends out of the positioning hole (3-2) from back to front, and the rest is the front end of the needle tip extending out of the positioning hole; the number of the positioning depressions (7-1) along the axial length of the positioning tube (7) is equal to the number of the positioning holes extending from the front end of the needle point.

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