Flexible expander

Abstract

The flexible expander comprises an inner tube and an outer tube which are sleeved together in a sliding mode, the outer tube comprises an external expansion deformation part close to the front end of the outer tube and an external thread part close to the rear end of the outer tube, the front end of the inner tube is fixedly connected with the front end of the outer tube in a clamped mode, and a transmission ring is fixedly arranged at the rear end of the inner tube in a sleeved mode. A nut capable of freely rotating is arranged on the transmission ring, and the nut is matched with the external thread part; according to the scheme, after the flexible dilator enters a human body, the front end of the flexible dilator can be opened, so that soft tissue blocking an operation visual field in a channel is pushed aside, medical staff do not need to spend a lot of time to clean the soft tissue blocking the visual field, the operation difficulty is reduced, the operation efficiency is improved, and postoperative pain caused by unnecessary soft tissue cleaning is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a flexible dilator. BACKGROUND

[0002] Unilateral biportal endoscopic spinal surgery (UBE) refers to a spinal endoscopic surgery performed through two channels on the same side of the spine, and is a modified minimally invasive spinal endoscopic surgery technology. UBE requires the establishment of an endoscopic observation channel and an instrument operation channel. The observation channel generally uses a 0° or 30° endoscope, and the operation channel can apply conventional spinal surgery and sports medicine instruments, such as curettes, drills, arthroscopic radiofrequency cutter heads, laminectomy rongeurs, nucleus forceps, nerve retractors, etc. Special UBE instrument consumables can also be used to complete central spinal canal decompression, bilateral nerve root and lateral recess decompression, and intervertebral bone graft fusion operations.

[0003] When performing UBE surgery, the endoscope enters the human body from the observation channel, and the operating instrument is placed into the human body from the operation channel. The operator uses the operating instrument to perform grinding, ablation, and other operations on the surgical site under the vision provided by the endoscope. In this process, a common problem is that it is difficult to find the operating instrument under the endoscopic vision. This is because the endoscopic observation channel is generally narrow, and there is usually a large amount of soft tissue blocking the vision at the outlet of the channel. It takes a lot of time to clean the soft tissue that blocks the line of sight in order to find the operating instrument. On the one hand, this expands unnecessary surgical damage, and on the other hand, it also prolongs the operation time and reduces the operation efficiency.

[0004] Therefore, there is an urgent need for a dilator to push away the soft tissue blocking the surgical field in the channel to shorten the operation time and improve the operation efficiency. UTILITY MODEL CONTENT

[0005] In view of the above shortcomings of the prior art, the utility model provides a flexible dilator, which solves the problems of high difficulty and low efficiency caused by soft tissue blocking the endoscopic vision.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A flexible dilator is provided, which includes an inner tube and an outer tube that are slidably sleeved together. The outer tube includes an outer expansion deformation part near its front end and an outer threaded part near its rear end. The front end of the inner tube is fixedly connected with the front end of the outer tube. The rear end of the inner tube is fixedly sleeved with a transmission ring. A freely rotatable nut is arranged on the transmission ring, and the nut is matched with the outer threaded part.

[0008] Further, the front end of the inner tube is provided with a blocking ring, and the outer side wall of the inner tube close to the front end is provided with a plurality of blocking blocks in the circumferential direction; the front end of the outer tube is provided with an annular sheet; the outer expansion deformation part comprises a plurality of deformation strips arranged in the circumferential direction; the annular sheet is clamped between the blocking ring and the plurality of blocking blocks; and the plurality of blocking blocks are respectively located at the gaps between adjacent two deformation strips.

[0009] Further, each deformation strip comprises two axially extending fixed sheets, one end of the two fixed sheets is connected through a flexible strip, and the other end of the two fixed sheets is respectively connected with the annular sheet and the outer tube through the flexible strip.

[0010] Further, at least one windowless area formed by the gap between adjacent two deformation strips exists on the outer expansion deformation part, and the width of the windowless area is greater than the gap width of the remaining adjacent two deformation strips.

[0011] Further, the outer side wall of the inner tube close to the rear end is provided with a plurality of positioning holes in the circumferential direction, and the inner side wall of the transmission ring is provided with a plurality of clamping blocks in the circumferential direction, which are respectively clamped with the plurality of positioning holes.

[0012] Further, the front end of the transmission ring is provided with a plurality of elastic sheets in the circumferential direction, the rear end of the nut is provided with an annular clamping groove, and the plurality of elastic sheets are clamped in the annular clamping groove and axially limited by the annular clamping groove.

[0013] Further, the nut is integrally formed with a knob for easy screwing.

[0014] Further, the inner tube and the outer tube are both hollow tubes with open ends.

[0015] The utility model discloses the beneficial effects are:

[0016] 1. The flexible dilator of the scheme can be opened at the front end after entering the human body, so as to push away the soft tissue that obstructs the surgical field in the channel, so that medical staff do not need to spend a lot of time to clean the soft tissue that obstructs the field of view, thereby reducing the operation difficulty, improving the operation efficiency, and reducing the postoperative pain caused by unnecessary soft tissue cleaning.

[0017] 2. The setting of the windowless area makes the instrument can smoothly enter the operation channel from the position of the windowless area, avoids being blocked by the deformation strip that is opened in the process, and further guarantees the smooth operation of the operation.

[0018] 3. The gap exists between the plurality of deformation strips, and the gap also exists between the two fixed sheets in the deformation strip, so that the scheme can effectively avoid sticking to the soft tissue in the process from the expansion state to the contraction state, thereby guaranteeing the safety of the operation. DRAWINGS

[0019] Figure 1It is a structural schematic view of the front end of the flexible dilator when not unfolded.

[0020] Figure 2 It is a side sectional view of the flexible dilator.

[0021] Figure 3 It is a structural schematic view of the inner tube.

[0022] Figure 4 It is a first structural schematic view of the outer tube.

[0023] Figure 5 It is a second structural schematic view of the outer tube.

[0024] Figure 6 It is a structural schematic view of the transmission ring.

[0025] Figure 7 It is a structural schematic view of the screw cap.

[0026] Figure 8 It is a structural schematic view of the front end of the flexible dilator when unfolded.

[0027] Wherein, 1, inner tube, 2, outer tube, 3, outer threaded part, 4, transmission ring, 5, screw cap, 6, check ring, 7, blocking block, 8, annular sheet, 9, deformation strip, 10, empty window area, 11, fixed sheet, 12, flexible strip, 13, positioning hole, 14, clamping block, 15, elastic sheet, 16, annular clamping groove, 17, knob. DETAILED DESCRIPTION

[0028] The specific embodiments of the utility model are described below, so that the person skilled in the art can understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiments, for the person skilled in the ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, all the utility model creations using the utility model concept are within the scope of protection.

[0029] As Figures 1 to 8 shown, the flexible dilator of the scheme includes the inner tube 1 and the outer tube 2 that slide together, the inner tube 1 and the outer tube 2 are both open-ended hollow tubes, provide access channel for endoscope, the outer tube 2 includes the outer expansion deformation part close to its front end and the outer threaded part 3 close to its rear end, the front end of the inner tube 1 is clamped and fixed with the front end of the outer tube 2, the rear end of the inner tube 1 is fixedly sleeved with the transmission ring 4, the transmission ring 4 is provided with the screw cap 5 that can rotate freely, the screw cap 5 is integrally formed with the knob 17 that is convenient for its screwing, and the screw cap 5 is matched with the outer threaded part 3.

[0030] The front end of the inner tube 1 is provided with a blocking ring 6, and the outer side wall of the inner tube 1 close to the front end is provided with three blocking blocks 7 in the circumferential direction, the front end of the outer tube 2 is provided with an annular sheet 8, the outer expansion shape changing part includes three shape changing strips 9 arranged in the circumferential direction, the annular sheet 8 is clamped between the blocking ring 6 and the three blocking blocks 7, and the three blocking blocks 7 are respectively located at the gap between adjacent two shape changing strips 9.

[0031] As an optional implementation, each shape changing strip 9 includes two axially extending fixed sheets 11, one end of the two fixed sheets 11 is connected through a rigid-flexible strip 12, and the other end of the two fixed sheets 11 is respectively connected with the annular sheet 8 and the outer tube 2 through the rigid-flexible strip 12; there is an empty window area 10 formed by the gap between adjacent two shape changing strips 9 on the outer expansion shape changing part, and the width of the empty window area 10 is greater than the gap width of the remaining adjacent two shape changing strips 9.

[0032] As an optional implementation, the outer side wall of the inner tube 1 close to the rear end is provided with four positioning holes 13 in the circumferential direction, and the inner side wall of the transmission ring 4 is provided with four clamping blocks 14 clamped with the four positioning holes 13 in the circumferential direction; the circumferential direction of the front end of the transmission ring 4 is provided with four buckle type elastic sheets 15, the rear end of the nut 5 is provided with an annular clamping groove 16, and the four elastic sheets 15 are clamped in the annular clamping groove 16 and axially limited by the annular clamping groove 16.

[0033] The working principle of the scheme will be described in detail as follows:

[0034] When the flexible dilator is used, the medical staff can hold the outer tube 2 and rotate the nut 5 at the same time, so that the nut 5 is axially displaced, and the inner tube 1 is driven by the transmission ring 4 to move forward or backward along the axial direction, and the blocking ring 6 at the front end of the inner tube 1 cooperates with the blocking blocks 7 to drive the annular sheet 8 to move forward or backward along the axial direction, when the annular sheet 8 retreats, the three shape changing strips 9 are extruded and deformed to expand outward, so as to push away the soft tissue blocking the surgical field in the channel, and when the instrument enters the operating channel, it can be quickly found under the endoscope field of view, so as to facilitate the smooth progress of the operation; in addition, the instrument can smoothly enter the operating channel from the position of the empty window area 10, avoiding being blocked by the expanded shape changing strips 9 during the movement, so as to further ensure the smooth progress of the operation.

[0035] As described above, the flexible dilator of the scheme can push away the soft tissue blocking the surgical field in the channel by expanding the front end, so that the medical staff does not need to spend a lot of time to clean the soft tissue blocking the field of view, thereby reducing the difficulty of the operation, improving the efficiency of the operation, and reducing the postoperative pain caused by unnecessary soft tissue cleaning.

Claims

1. A flexible dilator, comprising: The utility model provides a kind of pipe transmission mechanism, including sliding sleeve together inner tube and outer tube, the outer tube includes expansion section near its front end and outer thread part near its rear end, the front end of the inner tube is fixed with the front end of outer tube, the rear end of the inner tube is fixed with transmission ring, the transmission ring is provided with freely rotatable screw cap, and screw cap is matched with outer thread part.

2. The flexible dilator of claim 1, wherein, The front end of the inner tube is provided with baffle, and the outer side wall of the inner tube near its front end is provided with a plurality of blocking blocks along the circumference, the front end of the outer tube is provided with annular sheet, the expansion section includes a plurality of deformation strips arranged along the circumference, the annular sheet is clamped between baffle and a plurality of blocking blocks, and a plurality of blocking blocks are respectively located at the gap between adjacent two deformation strips.

3. The flexible dilator of claim 2, wherein, Each deformation strip includes two axially extending fixed sheets, one end of the two fixed sheets is connected by flexible strip, and the other end of the two fixed sheets is respectively connected with annular sheet and outer tube by flexible strip.

4. The flexible dilator of claim 2, wherein, There is at least one window area formed by the gap between adjacent two deformation strips on the expansion section, and the width of the window area is greater than the width of the gap between the other adjacent two deformation strips.

5. The flexible dilator of claim 1, wherein, The outer side wall of the inner tube near its rear end is provided with a plurality of positioning holes along the circumference, and the inner side wall of the transmission ring is provided with a plurality of clamping blocks along the circumference, which are respectively matched with a plurality of positioning holes.

6. The flexible dilator of claim 1, wherein, A plurality of elastic sheets are arranged along the circumference at the front end of the transmission ring, the rear end of the screw cap is provided with annular clamping groove, a plurality of elastic sheets are clamped in annular clamping groove and axially limited by annular clamping groove.

7. The flexible dilator of claim 1, wherein, A knob is integrally formed on the screw cap to facilitate screwing.

8. The flexible dilator of Claim 1, wherein, The inner tube and the outer tube are both hollow tubes with both ends open.

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