Injection needle for endoscope
By designing an injection needle for endoscope with convex strips and limiting slots, the problem that existing injection needles cannot choose the appropriate needle length according to the lesion condition is solved, and flexible adjustment of the needle penetration distance and stronger applicability are achieved.
Patent Information
- Application Number
- CN202411873432.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-04
AI Technical Summary
The existing injection needles for endoscopy cannot select the appropriate needle discharge length according to the lesion, and the operation flexibility is insufficient.
An injection needle including a handle, pusher, flexible sheath, flexible inner tube and needle is designed. The two-step adjustment is achieved through the coordination of the convex strip and the limiting groove. The distance from the needle through the flexible sheath can be selected according to the actual situation.
The distance between the needle through the flexible sheath tube is adjustable, which is highly applicable and more flexible, and is suitable for the treatment of different lesions.
Smart Images
Figure CN119548710A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of endoscopes, in particular to an injection needle used for endoscopes. Background Art
[0002] EMR / ESD surgery is a common mucosal cutting / stripping surgery in gastroenterology under endoscopy. During the operation, an injection needle is needed to inject and bulge the mucosal layer to facilitate the next operation. The existing injection needle has the same length of needle withdrawal each time the handle is pushed into place, and the operator cannot choose the appropriate needle withdrawal length according to the lesion. For example, the patent document with publication number CN109675179A discloses an anti-sticking injection needle for endoscope, and the needle of the injection needle has only one needle withdrawal position. Summary of the invention
[0003] In view of the above problems, the present invention provides an injection needle for endoscope.
[0004] The technical solution adopted by the present invention is as follows: An injection needle for an endoscope comprises a handle, a hollow pushing member, a flexible sheath tube, a flexible inner tube and a needle; The first end of the flexible sheath is fixed on the handle, the outer wall of the flexible sheath is adjacent to the second end of the flexible sheath and has a gear adjustment mark, the inner wall of the second end of the flexible sheath has a convex strip arranged along the length direction of the flexible sheath, and the gear adjustment mark corresponds to the convex strip; The pushing member is rotatably arranged on the handle and can move axially relative to the handle; The flexible inner tube is sleeved on the flexible sheath tube, the first end of the flexible inner tube is connected to the pushing member, the pushing member can drive the flexible inner tube to rotate and move synchronously, the second end of the flexible inner tube is located in the flexible sheath tube and adjacent to the second end of the flexible sheath tube, the outer side wall of the second end of the flexible inner tube is provided with a first limiting groove and a second limiting groove arranged along the length direction of the flexible inner tube, the first limiting groove and the second limiting groove are staggered, and one end of the first limiting groove and one end of the second limiting groove both extend to the end surface of the second end of the flexible inner tube, and the length of the second limiting groove is greater than the length of the first limiting groove; The flexible sheath is made of a transparent material, or the portion of the flexible sheath adjacent to the second end of the flexible sheath has a transparent area, through which the first limiting groove and the second limiting groove inside the flexible sheath can be observed; One end of the needle is fixed to the second end of the flexible inner tube; the convex strip is used to be embedded in the first limiting groove or the second limiting groove. When the convex strip is embedded in the first limiting groove and the convex strip is butted against the end of the first limiting groove, the distance that the needle passes through the flexible sheath is a; when the convex strip is embedded in the second limiting groove and the convex strip is butted against the end of the second limiting groove, the distance that the needle passes through the flexible sheath is b, and b is greater than a.
[0005] The present application can achieve two-gear adjustment through the cooperation of the convex strip and the two limiting grooves. In each gear, the distance that the needle finally passes through the flexible sheath is different. The operator can select the appropriate gear according to the actual situation. The present application has strong applicability and is more flexible. The flexible inner tube can be driven to rotate in the flexible sheath by rotating the push piece, thereby changing the circumferential position of the convex strip. The flexible sheath is made of transparent material or has a transparent area. Combined with the gear adjustment mark, the convex strip can be quickly aligned with the first limiting groove or the second limiting groove.
[0006] In one embodiment of the present invention, the gear shift mark is preferably an arrow.
[0007] In one embodiment of the present invention, there are three convex strips, which are evenly distributed around the axis of the second end of the flexible sheath tube. There are three first limiting grooves and three second limiting grooves, respectively. The three first limiting grooves are evenly distributed around the axis of the second end of the flexible inner tube, and the three second limiting grooves are evenly distributed around the axis of the second end of the flexible inner tube.
[0008] In one embodiment of the present invention, the ratio of a to b is (0.4-0.6):1.
[0009] The ability to achieve two different needle lengths allows for more flexible treatment of lesions.
[0010] In one embodiment of the present invention, the first limiting groove has a first gear mark, and the second limiting groove has a second gear mark.
[0011] In actual use, the gear position mark can be text or pattern, and can also be distinguished by different colors. For example, the first gear position is marked as Ⅰ, and the second gear position is marked as Ⅱ.
[0012] In one embodiment of the present invention, the outermost end of the first limiting groove and the outermost end of the second limiting groove both have a guiding expansion structure.
[0013] That is, the guide expansion structure is arranged on the end surface of the second end of the flexible inner tube. The guide expansion structure can guide the convex strip, and when the gear adjustment mark is slightly deviated from the first limit groove and the second limit groove and is not completely aligned, it can also be normally embedded at the back, reducing the difficulty of adjustment.
[0014] In one embodiment of the present invention, the handle has a mounting groove, the pushing member has a large diameter portion and a small diameter portion, the small diameter portion is connected to the flexible inner tube, and a step is provided between the large diameter portion and the small diameter portion; A return spring is also installed in the handle. The return spring is sleeved on the small diameter portion, one end of the return spring abuts against the inner wall of the handle, and the other end abuts against the step. The return spring is used to make the pusher have a tendency to move away from the needle. The handle is also provided with a locking and unlocking structure, and the locking and unlocking structure is used to cooperate with the pushing member to locate the axial position of the pushing member.
[0015] In one embodiment of the present invention, the positioning structure includes: A plurality of annular convex teeth arranged at intervals are arranged on the large diameter portion; a notch, provided on the handle, for penetrating through the side wall of the handle; A locking member, rotatably mounted on the handle, the locking member comprising a locking portion extending into the recess and cooperating with the annular convex teeth, and a pressing portion located on the outside; and An elastic member, disposed between the locking member and the handle, and used to make the locking member have a rotation tendency to rotate toward one side of the annular protruding teeth; When the pushing member is pressed toward the inside of the handle, the annular convex tooth can overcome the elastic force of the elastic member and push the locking member to rotate to the side away from the annular convex tooth; when the annular convex tooth abuts against the locking portion and a pulling force is applied to the pushing member toward the outside of the handle, the annular convex tooth prevents the pushing member from moving outward.
[0016] That is, the positioning structure of the present application is equivalent to a one-way spine, which is unlocked by pressing the pressing portion. At this time, the annular convex tooth no longer abuts against the locking portion, and the pusher can automatically reset under the action of the reset spring, and the needle is retracted into the flexible sheath.
[0017] In actual use, preferably, the elastic member is a torsion spring.
[0018] In one embodiment of the present invention, the outer wall of the pushing member has an annular fixed-gear mark, and the injection needle of the endoscope has an initial state, a fixed-gear state, a first-gear needle-out state, and a second-gear needle-out state; In the initial state, the convex strip is not embedded in the first limiting groove and the second limiting groove, the fixed position mark is located outside the handle, and the needle is completely located inside the flexible sheath; In the fixed position state, the pusher moves toward the inner side of the handle until the fixed position mark is blocked by the handle, the convex strip is embedded in the guide expansion structure of the first limiting groove or the guide expansion structure of the second limiting groove, and the needle is completely located inside the flexible sheath tube; When the needle is in the first gear position, the convex strip is embedded in the first limiting groove, and the convex strip abuts against the end of the first limiting groove, and the distance that the needle passes through the flexible sheath is a; When the needle is in the second gear position and is in the needle-out state, the convex strip is embedded in the second limiting groove, and the convex strip abuts against the end of the second limiting groove, and the distance that the needle passes through the flexible sheath is b.
[0019] In one embodiment of the present invention, the stop mark is an annular groove.
[0020] In one embodiment of the present invention, the inner side wall of the second end of the flexible sheath tube further has an anti-slip portion, the anti-slip portion has a through hole for the needle to pass through, and the end of the through hole has a tapered guiding structure.
[0021] In one embodiment of the present invention, the handle includes a connecting seat and a body, and the connecting seat and the body are threadedly connected or rotationally snap-fitted.
[0022] The connection base and the main body are arranged in this way for easy assembly.
[0023] The beneficial effects of the present invention are as follows: the present application can realize two-gear adjustment through the cooperation of the convex strip and the two limiting grooves. In each gear, the distance that the needle finally passes through the flexible sheath is different. The operator can select the appropriate gear according to the actual situation. The present application has strong applicability and is more flexible. The flexible inner tube can be driven to rotate in the flexible sheath by rotating the push piece, thereby changing the circumferential position of the convex strip, and the flexible sheath is made of transparent material or has a transparent area. Combined with the gear adjustment mark, the convex strip can be quickly aligned with the first limiting groove or the second limiting groove. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a schematic diagram of an injection needle for an endoscope in an initial state (the convex strip corresponds to the first limiting groove); Figure 2 yes Figure 1 The enlarged view of point A in the middle; Figure 3 yes Figure 1 Schematic diagrams containing hidden lines; Figure 4 yes Figure 3 The enlarged view of point B in the middle; Figure 5 is a schematic diagram of another angle of the injection needle used for endoscope in the initial state; Figure 6 yes Figure 5 Enlarged view of point C in the middle; Figure 7 is a schematic diagram of the injection needle after the flexible sheath tube part structure is cut open in the initial state; Figure 8 yes Figure 7The enlarged view of point D in the middle; Fig. 9 is a schematic diagram of the injection needle after the flexible sheath tube part structure is cut open in the fixed position state (the convex strip corresponds to the first limiting groove); Fig.10 yes Fig. 9 Enlarged view of point E in the middle; Fig.11 yes Fig. 9 Schematic diagram of another angle in the state; Fig.12 yes Fig.11 The enlarged view of F in the middle; Fig.13 is a schematic diagram of the injection needle after the flexible sheath tube part structure is cut open in the first gear needle withdrawal state; Fig.14 yes Fig.13 Enlarged view of G in the middle; Fig.15 is a schematic diagram of an injection needle for an endoscope in an initial state (the convex strip corresponds to the second limiting groove); Fig.16 yes Fig.15 The enlarged view of the H in the middle; Fig.17 It is a schematic diagram of the injection needle after the flexible sheath tube part structure is cut open in the fixed position state (the convex strip corresponds to the second limiting groove); Fig.18 yes Fig.17 The enlarged view of point I in the middle; Fig.19 is a schematic diagram of the injection needle after the flexible sheath tube part structure is cut open in the needle withdrawal state at the second gear; Fig. 20 yes Fig.19 The enlarged view of J in the middle; Fig.21 is a front view of an injection needle for an endoscope in a needle-out state at the second gear; Fig. 22 yes Fig.21 Middle AA section view; Fig.23 yes Fig. 22 Enlarged view of K in the middle; Fig.24 yes Fig. 22 Enlarged view of L in the middle; Fig.25 Schematic diagram of the second end of the flexible inner tube and the needle.
[0025] The reference numerals in the figures are: 1. Handle; 11. Main body; 12. Connecting seat; 13. Mounting groove; 14. Notch; 2. Pushing member; 21. Large diameter portion; 211. Annular convex teeth; 22. Small diameter portion; 23. Step; 24. Fixed gear mark; 3. Flexible sheath; 3a. First end of flexible sheath; 3b. Second end of flexible sheath; 31. Shift mark; 32. Raised strip; 33. Anti-slip portion; 34. Through hole; 35. Conical guide structure; 4. Flexible inner tube; 4a. First end of flexible inner tube; 4b. Second end of flexible inner tube; 41. First limiting groove; 411. Guide expansion structure; 42. Second limiting groove; 43. First gear mark; 44. Second gear mark; 5. Needle; 6. Reset spring; 7. Locking and unlocking structure; 71. Locking member; 711. Locking portion; 712. Pressing portion. DETAILED DESCRIPTION
[0026] The present invention is described in detail below in conjunction with the accompanying drawings.
[0027] like Figure 1 to Figure 25 As shown, an injection needle 5 for endoscope includes a handle 1, a hollow pusher 2, a flexible sheath 3, a flexible inner tube 4 and a needle 5; like Fig.23 As shown, the first end 3a of the flexible sheath is fixed on the handle 1, as shown in FIG. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, the outer wall of the flexible sheath tube 3 is adjacent to the second end 3b of the flexible sheath tube and has a shift mark 31, and the inner wall of the second end 3b of the flexible sheath tube has a convex strip 32 arranged along the length direction of the flexible sheath tube 3, and the shift mark 31 corresponds to the convex strip 32; like Figure 1 and Fig.23 As shown, the pushing member 2 is rotatably disposed on the handle 1 and the pushing member 2 can move axially relative to the handle 1; like Fig. 22 and Fig.23 As shown, the flexible inner tube 4 is sleeved on the flexible sheath tube 3, and the first end 4a of the flexible inner tube is connected to the pusher 2, and the pusher 2 can drive the flexible inner tube 4 to rotate and move synchronously. Figure 8 and Fig.25 As shown, the second end 4b of the flexible inner tube is located inside the flexible sheath tube 3 and adjacent to the second end 3b of the flexible sheath tube, and the outer side wall of the second end 4b of the flexible inner tube has a first limiting groove 41 and a second limiting groove 42 arranged along the length direction of the flexible inner tube 4, the first limiting groove 41 and the second limiting groove 42 are staggered, and one end of the first limiting groove 41 and one end of the second limiting groove 42 both extend to the end surface of the second end 4b of the flexible inner tube, and the length of the second limiting groove 42 is greater than the length of the first limiting groove 41; In this embodiment, the flexible sheath tube 3 is made of a transparent material, and the first limiting groove 41 and the second limiting groove 42 inside the flexible sheath tube 3 can be observed through the flexible sheath tube 3 made of the transparent material; or, the portion of the flexible sheath tube 3 adjacent to the second end 3b of the flexible sheath tube has a transparent area, and the first limiting groove 41 and the second limiting groove 42 inside the flexible sheath tube 3 can be observed through the transparent area; like Figure 8 and Fig.25 As shown, one end of the needle 5 is fixed to the second end 4b of the flexible inner tube.
[0028] like Fig.13 and Fig.14 As shown, the convex strip 32 is used to be embedded in the first limiting groove 41 or the second limiting groove 42. When the convex strip 32 is embedded in the first limiting groove 41 and the end of the convex strip 32 and the first limiting groove 41 abut against each other, the distance a that the needle 5 passes through the flexible sheath 3 is. Fig.19 and Fig. 20 As shown, when the convex strip 32 is embedded in the second limiting groove 42 and the convex strip 32 butts against the end of the second limiting groove 42, the distance that the needle 5 passes through the flexible sheath 3 is b, and b is greater than a.
[0029] The present application can realize two-gear adjustment through the cooperation of the convex strip 32 and the two limiting grooves. In each gear, the distance that the needle 5 finally passes through the flexible sheath tube 3 is different. The operator can select the appropriate gear according to the actual situation. The present application has strong applicability and is more flexible. By rotating the push member 2, the flexible inner tube 4 can be driven to rotate in the flexible sheath tube 3, thereby changing the circumferential position of the convex strip 32. The flexible sheath tube 3 is made of transparent material or has a transparent area. In combination with the gear adjustment mark 31, the convex strip 32 can be quickly aligned with the first limiting groove 41 or the second limiting groove 42.
[0030] like Figure 2 and Figure 8 As shown, in this embodiment, the gear shift mark 31 is preferably an arrow.
[0031] like Fig.25 As shown, in this embodiment, there are three convex strips 32, which are evenly distributed around the axis of the second end 3b of the flexible sheath tube. There are three first limiting grooves 41 and three second limiting grooves 42, respectively. The three first limiting grooves 41 are evenly distributed around the axis of the second end 4b of the flexible inner tube, and the three second limiting grooves 42 are evenly distributed around the axis of the second end 4b of the flexible inner tube.
[0032] In this embodiment, the ratio of a to b is (0.4-0.6): 1. The needle 5 can be provided with two different lengths, so that the needle 5 can be used to treat the lesion more flexibly.
[0033] like Figure 8 and Fig.25As shown, in this embodiment, the first limit groove 41 has a first gear mark 43, and the second limit groove 42 has a second gear mark 44. In actual use, the gear mark can be text or pattern, and can also be distinguished by different colors. For example, the first gear mark 43 is I, and the second gear mark 44 is II.
[0034] like Figure 8 and Fig.25 As shown, in this embodiment, the outermost end of the first limiting groove 41 and the outermost end of the second limiting groove 42 both have a guiding expansion structure 411 .
[0035] That is, the guide expansion structure 411 is arranged on the end surface of the second end 4b of the flexible inner tube. The guide expansion structure 411 can guide the convex strip 32, and when the gear adjustment mark 31 is slightly deviated from the first limit groove 41 and the second limit groove 42 and is not completely aligned, it can also be normally embedded at the back, reducing the difficulty of adjustment.
[0036] like Fig.23 As shown, in this embodiment, the handle 1 has a mounting groove 13, the pusher 2 has a large diameter portion 21 and a small diameter portion 22, the small diameter portion 22 is connected to the flexible inner tube 4, and a step 23 is provided between the large diameter portion 21 and the small diameter portion 22; A return spring 6 is also installed in the handle 1. The return spring 6 is sleeved on the small diameter portion 22, with one end abutting against the inner wall of the handle 1 and the other end abutting against the step 23. The return spring 6 is used to make the pusher 2 have a tendency to move away from the needle 5. The handle 1 also has a locking and unlocking structure 7 , which is used to cooperate with the pushing member 2 to locate the axial position of the pushing member 2 .
[0037] like Figure 6 and Fig.23 As shown, in this embodiment, the positioning structure includes: A plurality of annular protruding teeth 211 arranged at intervals are provided on the large diameter portion 21; A notch 14 is provided on the handle 1 and is used to penetrate the side wall of the handle 1; A locking member 71 is rotatably mounted on the handle 1, and the locking member 71 comprises a locking portion 711 extending into the recess 14 and cooperating with the annular protruding teeth 211, and a pressing portion 712 located on the outside; and An elastic member (omitted and not shown in the figure) is disposed between the locking member 71 and the handle 1, and is used to make the locking member 71 have a rotation tendency to rotate toward the side of the annular protruding tooth 211; When the pushing member 2 is pressed toward the inside of the handle 1, the annular convex tooth 211 can overcome the elastic force of the elastic member and push the locking member 71 to rotate to the side away from the annular convex tooth 211; when the annular convex tooth 211 abuts against the locking portion 711 and a pulling force is applied to the pushing member 2 toward the outside of the handle 1, the annular convex tooth 211 prevents the pushing member 2 from moving outward.
[0038] That is, the positioning structure of the present application is equivalent to a one-way thorn, and is unlocked by pressing the pressing portion 712. At this time, the annular convex tooth 211 no longer abuts against the locking portion 711. Under the action of the reset spring 6, the push member 2 can automatically reset, and the needle 5 is retracted into the flexible sheath 3.
[0039] In actual use, preferably, the elastic member is a torsion spring.
[0040] like Figure 1 and Figure 6 As shown, in this embodiment, the outer wall of the pushing member 2 has a ring-shaped fixed-gear mark 24, and the injection needle 5 of the endoscope has an initial state, a fixed-gear state, a first-gear needle 5 state, and a second-gear needle 5 state; In the initial state, Figure 8 As shown, the convex strip 32 is not embedded in the first limiting groove 41 and the second limiting groove 42, and the fixed position mark 24 is located on the outside of the handle 1 (see Figure 1 and Figure 6 ), the needle 5 is completely located inside the flexible sheath 3.
[0041] At this time, the circumferential position of the flexible inner tube 4 is changed by rotating the push member 2, so that the shift mark 31 can correspond to the first limit groove 41 (see Figure 8 ), or, the shift mark 31 is made to correspond to the second limit groove 42 (see Fig.16 ).
[0042] In the fixed position state, the push member 2 moves toward the inner side of the handle 1 until the fixed position mark 24 is blocked by the handle 1, and the convex strip 32 is embedded in the guide expansion structure 411 of the first limiting groove 41 (see Fig.10 ) or the guide expansion structure 411 of the second limiting groove 42 (see Fig.18 ), the needle 5 is completely located inside the flexible sheath 3; the fixed gear state of the present application can make the convex strip 32 correspond to the corresponding limit groove, and the injection needle 5 will not be separated from each other due to the bending of the flexible sheath 3 and the flexible inner tube 4 after being inserted into the endoscope, that is, the gear position can be determined and maintained.
[0043] When the needle is in the first gear and the needle is out 5, Fig.14 As shown, the convex strip 32 is embedded in the first limiting groove 41, and the convex strip 32 abuts against the end of the first limiting groove 41, and the distance that the needle 5 passes through the flexible sheath tube 3 is a.
[0044] When the needle is in the second gear and the needle is 5, Fig. 20 As shown, the convex strip 32 is embedded in the second limiting groove 42, and the convex strip 32 abuts against the end of the second limiting groove 42, and the distance that the needle 5 passes through the flexible sheath tube 3 is b.
[0045] like Figure 6 As shown, in this embodiment, the gear mark 24 is an annular groove.
[0046] like Fig.24 As shown, in this embodiment, the inner side wall of the second end 3b of the flexible sheath tube further has an anti-slip portion 33 , the anti-slip portion 33 has a through hole 34 for the needle 5 to pass through, and the end of the through hole 34 has a tapered guide structure 35 .
[0047] like Figure 1 and Fig.23 As shown, in this embodiment, the handle 1 includes a connection base 12 and a body 11, and the connection base 12 and the body 11 are threadedly connected or rotatably snap-fitted. The connection base 12 and the body 11 are arranged in this way for easy assembly.
[0048] When this embodiment is used, one end of the pushing member 2 is used to connect the syringe or catheter, and the gear position is determined according to the situation on hand. Before inserting the injection needle 5, it is first adjusted to the corresponding gear position. After the adjustment is completed, the pushing member 2 is initially pushed so that the fixed gear mark 24 is completely blocked by the handle 1 (that is, it is in the fixed gear state), and then the injection needle 5 is inserted into the endoscope, and the pushing member 2 is pushed until the needle 5 no longer moves outward, and then the liquid is delivered to the lesion through the pushing member 2, the flexible inner tube 4, and the needle 5.
[0049] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention and the drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the present invention.
Claims
1. An injection needle for an endoscope, characterized in that: It includes a handle, a hollow pusher, a flexible sheath, a flexible inner tube and a needle; The first end of the flexible sheath is fixed on the handle, the outer wall of the flexible sheath is adjacent to the second end of the flexible sheath and has a gear adjustment mark, the inner wall of the second end of the flexible sheath has a convex strip arranged along the length direction of the flexible sheath, and the gear adjustment mark corresponds to the convex strip; The pushing member is rotatably arranged on the handle and can move axially relative to the handle; The flexible inner tube is sleeved on the flexible sheath tube, the first end of the flexible inner tube is connected to the pushing member, the pushing member can drive the flexible inner tube to rotate and move synchronously, the second end of the flexible inner tube is located in the flexible sheath tube and adjacent to the second end of the flexible sheath tube, the outer side wall of the second end of the flexible inner tube is provided with a first limiting groove and a second limiting groove arranged along the length direction of the flexible inner tube, the first limiting groove and the second limiting groove are staggered, and one end of the first limiting groove and one end of the second limiting groove both extend to the end surface of the second end of the flexible inner tube, and the length of the second limiting groove is greater than the length of the first limiting groove; The flexible sheath is made of a transparent material, or the portion of the flexible sheath adjacent to the second end of the flexible sheath has a transparent area, through which the first limiting groove and the second limiting groove inside the flexible sheath can be observed; One end of the needle is fixed to the second end of the flexible inner tube; the convex strip is used to be embedded in the first limiting groove or the second limiting groove. When the convex strip is embedded in the first limiting groove and the convex strip is butted against the end of the first limiting groove, the distance that the needle passes through the flexible sheath is a; when the convex strip is embedded in the second limiting groove and the convex strip is butted against the end of the second limiting groove, the distance that the needle passes through the flexible sheath is b, and b is greater than a.
2. The injection needle for endoscope according to claim 1, characterized in that: The ratio of a to b is (0.4~0.6):
1.
3. The injection needle for endoscope according to claim 1, characterized in that: The first limiting groove has a first gear mark, and the second limiting groove has a second gear mark.
4. The injection needle for endoscope according to claim 1, characterized in that: The outermost end of the first limiting groove and the outermost end of the second limiting groove both have a guiding flaring structure.
5. The injection needle for endoscope according to claim 4, characterized in that: The handle has a mounting groove therein, the pushing member has a large diameter portion and a small diameter portion, the small diameter portion is connected to the flexible inner tube, and a step is provided between the large diameter portion and the small diameter portion; A return spring is also installed in the handle. The return spring is sleeved on the small diameter portion, one end of the return spring abuts against the inner wall of the handle, and the other end abuts against the step. The return spring is used to make the pusher have a tendency to move away from the needle. The handle is also provided with a locking and unlocking structure, and the locking and unlocking structure is used to cooperate with the pushing member to locate the axial position of the pushing member.
6. The injection needle for endoscope according to claim 5, characterized in that: The positioning structure comprises: A plurality of annular convex teeth arranged at intervals are arranged on the large diameter portion; a notch, provided on the handle, for penetrating through the side wall of the handle; A locking member, rotatably mounted on the handle, the locking member comprising a locking portion extending into the recess and cooperating with the annular convex teeth, and a pressing portion located on the outside; and An elastic member, disposed between the locking member and the handle, and used to make the locking member have a rotation tendency to rotate toward one side of the annular protruding teeth; When the pushing member is pressed toward the inside of the handle, the annular convex tooth can overcome the elastic force of the elastic member and push the locking member to rotate to the side away from the annular convex tooth; when the annular convex tooth abuts against the locking portion, when a pulling force is applied to the pushing member toward the outside of the handle and away from the needle, the annular convex tooth prevents the pushing member from moving outward.
7. The injection needle for endoscope according to claim 6, characterized in that: The outer wall of the pushing member has an annular fixed-gear mark, and the injection needle of the endoscope has an initial state, a fixed-gear state, a first-gear needle-out state, and a second-gear needle-out state; In the initial state, the convex strip is not embedded in the first limiting groove and the second limiting groove, and the fixed position mark is located on the outside of the handle; In the fixed position state, the pushing member moves toward the inner side of the handle until the fixed position mark is blocked by the handle, and the convex strip is embedded in the guide expansion structure of the first limiting groove or the guide expansion structure of the second limiting groove; When the needle is in the first gear position, the convex strip is embedded in the first limiting groove, and the convex strip abuts against the end of the first limiting groove, and the distance that the needle passes through the flexible sheath is a; When the needle is in the second gear position and is in the needle-out state, the convex strip is embedded in the second limiting groove, and the convex strip abuts against the end of the second limiting groove, and the distance that the needle passes through the flexible sheath is b.
8. The injection needle for endoscope according to claim 7, characterized in that: The fixed-gear mark is an annular groove.
9. The injection needle for endoscope according to claim 1, characterized in that: The inner side wall of the second end of the flexible sheath tube further has an anti-slip portion, the anti-slip portion has a through hole for the needle to pass through, and the end of the through hole has a tapered guiding structure.
10. The injection needle for endoscope according to claim 1, characterized in that: The handle comprises a connecting seat and a body, and the connecting seat and the body are threadedly connected or rotationally snap-fitted.
Citation Information
Patent Citations
Anti-sticking-head injection needle for endoscope
CN109675179A