Medical trephine and medical girdling device

Abstract

The utility model discloses a medical trephine and a medical girdling device, and relates to the technical field of medical instruments. The outer knife tube is provided with a near end and a far end, and the near end is connected with the transmission shaft; one end of the outer saw head is fixedly connected to the far end of the outer knife tube, and outer ring sawteeth which are annularly arranged are arranged at the end part of one end, deviating from the outer knife tube, of the outer saw head; the inner trephine assembly is sleeved with the outer cutter tube, one end of the inner trephine assembly is connected with the transmission shaft, the other end of the inner trephine assembly extends out of the end, away from the outer cutter tube, of the outer saw head, inner trephine sawteeth are annularly arranged at the end, and the transmission shaft drives the outer cutter tube and the inner trephine assembly to rotate synchronously and further drives the inner trephine sawteeth and the outer trephine sawteeth to rotate synchronously. According to the technical scheme, the possibility that the medical trephine is damaged is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially a medical ring saw and medical ring cutting device. BACKGROUND

[0002] The ring saw is a common medical instrument, mainly used in orthopedic surgery, and the blade of the ring saw is annular and provided with saw teeth, and the bone tissue is drilled or ring cut through high-speed rotation.

[0003] The double-layer ring saw comprises a saw cylinder, a connecting rod and a transmission device, an inner ring saw tooth and an outer ring saw tooth are arranged at one end of the saw cylinder, the outer ring saw tooth is fixed to the outer periphery of the inner ring saw tooth, the saw tooth end of the inner ring saw tooth protrudes from the outer ring saw tooth, the connecting rod connects the other end of the saw cylinder and the transmission device, and the transmission device drives the saw cylinder to rotate through the connecting rod, so that the outer ring saw tooth and the inner ring saw tooth on the saw cylinder rotate.

[0004] Since the outer ring saw tooth is fixed to the outer periphery of the inner ring saw tooth, the outer ring saw tooth and the inner ring saw tooth have different linear velocities when rotating, so that there is a certain difference between the stress of the outer ring saw tooth and the stress of the inner ring saw tooth during the process of sawing the bone tissue, and the two different stresses are transmitted to the connecting rod through the saw cylinder, which is easy to cause damage or fracture of the connecting rod. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a medical ring saw and a medical ring cutting device, which can reduce the possibility of damage of the medical ring saw.

[0006] To achieve the above-mentioned purpose, the utility model provides a medical ring saw, which comprises:

[0007] A transmission shaft;

[0008] An outer cutter tube, wherein the proximal end of the outer cutter tube is connected to the transmission shaft;

[0009] An outer saw head, wherein one end of the outer saw head is fixedly connected to the distal end of the outer cutter tube, and the end portion of the end of the outer saw head away from the outer cutter tube is provided with annularly arranged outer ring saw teeth;

[0010] An inner ring saw assembly, wherein the inner ring saw assembly is sleeved in the outer cutter tube, one end of the inner ring saw assembly is connected to the transmission shaft, the other end of the inner ring saw assembly extends from the end of the outer saw head away from the outer cutter tube and is provided with annularly arranged inner ring saw teeth, and the transmission shaft drives the outer cutter tube and the inner ring saw assembly to rotate synchronously, thereby driving the inner ring saw teeth and the outer ring saw teeth to rotate synchronously.

[0011] In an embodiment, the inner ring saw assembly comprises:

[0012] an inner cutter tube, the inner cutter tube being sleeved in the outer cutter tube, one end of the inner cutter tube being connected to the transmission shaft, and the other end of the inner cutter tube extending away from the transmission shaft; and

[0013] an inner saw head, the inner saw head being fixedly connected to the end of the inner cutter tube away from the transmission shaft, the inner saw head being provided with a receiving hole at an end thereof away from the inner cutter tube, and the inner ring saw teeth being arranged at a periphery of the receiving hole.

[0014] In an embodiment, a side wall of the inner saw head is provided with a first notch, and the first notch penetrates through the side wall of the inner saw head to communicate the interior of the outer saw head with the receiving hole.

[0015] The side wall of the outer saw head is provided with a second notch opposite to the first notch, the second notch penetrates through the side wall of the outer saw head to communicate the exterior of the outer saw head with the receiving hole, and the size of the second notch is greater than or equal to the size of the first notch.

[0016] In an embodiment, the inner saw head comprises:

[0017] a first connecting section fixedly connected to the end of the inner cutter tube away from the transmission shaft;

[0018] a first saw head section arranged at an end of the first connecting section away from the inner cutter tube, the receiving hole and the first notch being arranged at the first saw head section;

[0019] wherein the outer diameter of the first saw head section is greater than or equal to the outer diameter of the first connecting section.

[0020] In an embodiment, the outer saw head comprises:

[0021] a second connecting section fixedly connected to the end of the outer cutter tube away from the transmission shaft, the second notch being arranged at the second connecting section;

[0022] a second saw head section arranged at an end of the second connecting section away from the outer cutter tube;

[0023] wherein the outer diameter of the second saw head section is greater than or equal to the outer diameter of the second connecting section.

[0024] In an embodiment, the transmission shaft has two coaxial sections with different diameters, the inner cutter tube being fixedly connected to the section of the transmission shaft with a smaller diameter, and the outer cutter tube being fixedly connected to the section of the transmission shaft with a larger diameter.

[0025] In an embodiment, further comprising:

[0026] an inner saw handle, one end of the inner saw handle being connected to the inner cutter tube, and the other end of the inner saw handle being connected to the transmission shaft;

[0027] An elastic member is arranged between the inner saw handle and the transmission shaft.

[0028] One of the transmission shaft and the inner saw handle is provided with a clamping groove, and the other of the transmission shaft and the inner saw handle is provided with a clamping protrusion corresponding to the clamping groove.

[0029] The elastic member is compressed, the clamping protrusion is inserted into the clamping groove, the transmission shaft is combined with the inner saw handle, and the transmission shaft drives the inner saw handle to rotate.

[0030] The elastic member is released, the clamping protrusion is separated from the clamping groove, the transmission shaft is separated from the inner saw handle, and the inner saw handle stops rotating.

[0031] In an embodiment, further comprising:

[0032] A housing, the inner saw handle is rotatably arranged in the housing, and a part of the transmission shaft is arranged in the housing and the part of the transmission shaft extending out of the housing is sleeved with a first bearing.

[0033] An outer saw handle is rotatably arranged in the housing, a second bearing is sleeved between the outer saw handle and the housing, the outer saw handle is sleeved on the inner saw handle, one end of the outer saw handle is connected with the outer cutter tube, and the other end of the outer saw handle is connected with the transmission shaft.

[0034] A synchronous connection structure is connected with the inner saw handle and the outer saw handle, so that the inner saw handle and the outer saw handle rotate synchronously.

[0035] In an embodiment, the synchronous connection structure comprises a pin hole and a pin shaft, one of an inner wall of the outer saw handle and an outer wall of the inner saw handle is provided with the pin shaft, the other of the inner wall of the outer saw handle and the outer wall of the inner saw handle is provided with the pin hole extending along the axial direction of the transmission shaft, the pin shaft is inserted into the pin hole, and the pin shaft and the pin hole can slide relatively along the axial direction of the transmission shaft, so that the inner saw handle and the outer saw handle rotate synchronously and the inner saw handle can move axially relative to the outer saw handle.

[0036] In an embodiment, the inner saw handle comprises a first section, a second section and a third section connected in sequence, the outer diameters of the first section, the second section and the third section increase in sequence, the inner cutter tube is sleeved on the outside of the first section and connected with the first section, the outer cutter tube is sleeved on the outside of the second section and has a gap with the second section, one end of the outer saw handle is sleeved on the outside of the outer cutter tube and connected with the outer cutter tube, the other end of the outer saw handle is sleeved on the outside of the third section and has a gap with the third section, and the synchronous connection structure is connected with the third section and the outer saw handle.

[0037] The utility model also provides a medical cutting device, include:

[0038] The medical ring saw as described above; and

[0039] A driving mechanism is arranged to drive the transmission shaft, and drive the inner ring saw teeth and the outer ring saw teeth to rotate synchronously through the transmission shaft.

[0040] The medical ring saw in the technical scheme comprises a transmission shaft, an inner ring saw assembly, an outer cutter tube and an outer saw head, the transmission shaft is connected with the inner ring saw assembly and the outer cutter tube, the end of the inner ring saw assembly away from the transmission shaft is provided with the inner ring saw teeth, the end of the outer cutter tube away from the transmission shaft is provided with the outer saw head, and the end of the outer saw head away from the outer cutter tube is provided with the outer ring saw teeth; when the transmission shaft rotates, the transmission shaft drives the inner ring saw assembly and the outer cutter tube to rotate synchronously, and then the inner ring saw teeth and the outer ring saw teeth rotate synchronously, so that the sawing function of the bone tissue is realized. In the process of sawing the bone tissue by the medical ring saw, the stress of the inner ring saw teeth is transmitted to the inner ring saw assembly, and the stress of the outer ring saw teeth is transmitted to the outer cutter tube through the outer saw head; the stress of the inner ring saw teeth and the outer ring saw teeth is transmitted along different components and dispersed, the possibility that the inner ring saw assembly and the outer cutter tube bear the stress from different directions is reduced, the possibility that the inner ring saw assembly and the outer cutter tube are damaged is reduced, and then the possibility that the medical ring saw is damaged is reduced. On the other hand, compared with the design that the inner ring saw teeth and the outer ring saw teeth are integrated, when any one of the inner ring saw teeth and the outer ring saw teeth is damaged, the inner ring saw teeth and the outer ring saw teeth do not need to be replaced as a whole, and the maintenance cost of the medical ring saw is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0042] Figure 1 A sectional view of one embodiment of the medical ring saw provided by the present application is shown in the figure.

[0043] Figure 2 A partial structure diagram of one embodiment of the medical ring saw provided by the present application is shown in the figure.

[0044] Figure 3 A sectional view of a partial structure of one embodiment of the medical ring saw provided by the present application is shown in the figure. Figure 1

[0045] Figure 4 A sectional view of a partial structure of one embodiment of the medical ring saw provided by the present application is shown in the figure. Figure 2

[0046] Figure 5 ​​The utility model provides a part structure's section view of another embodiment of medical ring saw Figure 1 ;

[0047] Figure 6 The utility model provides a part structure's section view of another embodiment of medical ring saw Figure 2 .

[0048] Explanation of reference numerals:

[0049] 100, transmission shaft, 101, clamping groove

[0050] 200, inner ring saw assembly, 210, inner cutter tube, 220, inner saw head, 221, first connecting section, 222, first saw head section, 2201, inner ring saw tooth, 2202, accommodating hole, 2203, first notch

[0051] 310, outer cutter tube, 320, outer saw head, 321, second connecting section, 322, second saw head section, 3201, outer ring saw tooth, 3202, second notch

[0052] 400, shell

[0053] 500, inner saw handle, 501, clamping protrusion, 510, first section, 520, second section, 530, third section

[0054] 600, outer saw handle

[0055] 700, synchronous connection structure, 710, pin shaft, 720, pin hole

[0056] 800, elastic member

[0057] 910, first bearing, 920, second bearing

[0058] The utility model discloses the realization, functional characteristics and advantages will be combined with example, with reference to the further description of attached drawing. Specific implementation

[0059] The technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings of the utility model embodiments, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the utility model.

[0060] It should be noted that if the embodiment of the utility model has directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, if the certain posture changes, the directionality indication also changes accordingly.

[0061] In the utility model, unless otherwise expressly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integrated; "connection" can be mechanical connection, or electrical connection, can be direct connection, or indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship of two elements. Unless otherwise expressly limited, the above terms in the utility model can be understood according to the specific circumstances by those skilled in the art.

[0062] In addition, if the embodiment of the utility model has "first", "second" and the like description, the "first", "second" and the like description is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on that the combination of technical solutions can be realized by those skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0063] The utility model provides a kind of medical ring saw.

[0064] Please refer to Figures 1-2 , Figure 1 The sectional view of an embodiment of the medical ring saw provided by the utility model, Figure 2 The partial structure diagram of an embodiment of the medical ring saw provided by the utility model.

[0065] In an embodiment of the utility model, the medical ring saw includes:

[0066] Transmission shaft 100;

[0067] Outer cutter tube 310, outer cutter tube 310 has proximal end and distal end, proximal end connects transmission shaft 100;

[0068] The outer saw head 320 is fixedly connected to the distal end of the outer cutter tube 310, and the end away from the outer cutter tube 310 is provided with annularly arranged outer ring saw teeth 3201.

[0069] The inner ring saw assembly 200 is sleeved in the outer cutter tube 310, one end of the inner ring saw assembly 200 is connected to the transmission shaft 100, the other end extends from the end of the outer saw head 320 away from the outer cutter tube 310 and is provided with annularly arranged inner ring saw teeth 2201, and the inner ring saw teeth 2201 and the outer ring saw teeth 3201 are driven to rotate synchronously by the transmission shaft 100.

[0070] The medical ring saw in the technical scheme comprises a transmission shaft 100, an inner ring saw assembly 200, an outer cutter tube 310 and an outer saw head 320, the transmission shaft 100 is connected to the inner ring saw assembly 200 and the outer cutter tube 310, the end of the inner ring saw assembly 200 away from the transmission shaft 100 is provided with inner ring saw teeth 2201, the end of the outer cutter tube 310 away from the transmission shaft 100 is provided with the outer saw head 320, and the end of the outer saw head 320 away from the outer cutter tube 310 is provided with outer ring saw teeth 3201; when the transmission shaft 100 rotates, the transmission shaft 100 drives the inner ring saw assembly 200 and the outer cutter tube 310 to rotate synchronously, so that the inner ring saw teeth 2201 and the outer ring saw teeth 3201 rotate synchronously, and the sawing function of the bone tissue is realized. In the process of sawing the bone tissue by the medical ring saw, the stress of the inner ring saw teeth 2201 is transmitted to the inner ring saw assembly 200, the stress of the outer ring saw teeth 3201 is transmitted to the outer cutter tube 310 through the outer saw head 320, the stress of the inner ring saw teeth 2201 and the outer ring saw teeth 3201 is transmitted along different parts and dispersed, the possibility that the inner ring saw assembly 200 and the outer cutter tube 310 bear the stress from different directions is reduced, the possibility that the inner ring saw assembly 200 and the outer cutter tube 310 are damaged is reduced, and the possibility that the medical ring saw is damaged is reduced. On the other hand, compared with the design that the inner ring saw teeth 2201 and the outer ring saw teeth 3201 are integrated, when any one of the inner ring saw teeth 2201 and the outer ring saw teeth 3201 is damaged, the inner ring saw teeth 2201 and the outer ring saw teeth 3201 do not need to be replaced as a whole, and the maintenance cost of the medical ring saw is reduced.

[0071] The inner ring saw assembly 200 can be a combination of an inner saw head 220 and a cutter rod or a combination of an inner saw head 220 and a cutter tube.

[0072] In an embodiment, the inner ring saw assembly 200 comprises:

[0073] The inner cutter tube 210 is sleeved in the outer cutter tube 310, one end of the inner cutter tube 210 is connected to the transmission shaft 100, and the other end extends away from the transmission shaft 100; and

[0074] The inner saw head 220 is fixedly connected to one end of the inner cutter tube 210 away from the transmission shaft 100, and the inner saw head 220 is provided with a receiving hole 2202 at an end away from the inner cutter tube 210. An inner ring saw tooth 2201 is arranged at the periphery of the receiving hole 2202.

[0075] With reference to Figures 1-3 In the embodiment of the utility model, the inner ring saw assembly 200 includes the inner cutter tube 210 and the inner saw head 220, the inner cutter tube 210 connects the transmission shaft 100 and the inner saw head 220, and the inner ring saw tooth 2201 on the inner saw head 220 is driven to rotate through the inner cutter tube 210, which is simple in structure and light in weight, and is conducive to the light weight of the medical ring saw. The end of the inner saw head 220 away from the inner cutter tube 210 is provided with a receiving hole 2202, and the inner ring saw tooth 2201 is arranged at the periphery of the receiving hole 2202. The receiving hole 2202 is used for accommodating the bone tissue cut by the saw.

[0076] In an embodiment, the side wall of the inner saw head 220 is provided with a first notch 2203, and the first notch 2203 penetrates the side wall of the inner saw head 220 to communicate the inside of the outer saw head 320 and the receiving hole 2202.

[0077] The side wall of the outer saw head 320 is provided with a second notch 3202 opposite the first notch 2203, and the second notch 3202 penetrates the side wall of the outer saw head 320 to communicate the outside of the outer saw head 320 and the receiving hole 2202. The size of the second notch 3202 is greater than or equal to the size of the first notch 2203.

[0078] With reference to Figures 1-3 And Figure 6 In the embodiment of the utility model, the side wall of the inner saw head 220 is provided with a first notch 2203, and the outer saw head 320 is provided with a second notch 3202. The receiving hole 2202 communicates with the external environment through the first notch 2203 and the second notch 3202. The user can operate the bone tissue cut by the saw in the receiving hole 2202 through the first notch 2203 and the second notch 3202, which facilitates the removal of the bone tissue from the receiving hole 2202, improves the use convenience of the medical ring saw, and avoids the blocking of the receiving hole 2202 by the bone tissue, which causes the medical ring saw to be unable to continue to be used. In addition, the setting of the first notch 2203 and the second notch 3202 also reduces the weight of the medical ring saw, which is conducive to the light weight of the medical ring saw. The number and shape of the first notch 2203 can be designed as required, and the number and shape of the second notch 3202 are correspondingly set with the first notch 2203. With reference to Figure 3 And Figure 6 The size of the second notch 3202 is not less than the size of the first notch 2203, which facilitates the alignment of the first notch 2203 and the second notch 3202, and further improves the convenience of removing the bone tissue in the receiving hole 2202. The size can refer to the length, width or diameter, etc.

[0079] in combination Figure 1 , Figure 4 and Figure 5 , in particular to the present embodiment, the medical ring saw has a ring-penetration-stop function. When cutting bone tissue, the inner ring saw teeth 2201 on the inner ring saw assembly 200 first contact and bear force on the bone tissue, causing the elastic member 800 to deform under stress, the inner saw handle 500 is in butt joint with the transmission shaft 100, the transmission shaft 100 drives the inner saw handle 500 and the outer saw handle 600 to rotate synchronously, and further drives the inner cutter tube 210 and the outer cutter tube 310 to rotate synchronously, so that the inner ring saw teeth 2201 and the outer ring saw teeth 3201 rotate synchronously. When the bone tissue is cut through, the inner ring saw assembly 200 is no longer stressed, the elastic member 800 restores its deformation, the inner saw handle 500 is disconnected from the transmission shaft 100, the inner ring saw teeth 2201 and the outer ring saw teeth 3201 stop rotating at the same time, and the ring-penetration-stop function is realized. In this process, the inner saw handle 500 needs to move axially to be in butt joint or disconnected with the transmission shaft 100, so that the inner cutter tube 210 and the inner saw head 220 move axially with the inner saw handle 500. When the elastic member 800 is in a natural state, i.e., the inner saw handle 500 is disconnected from the transmission shaft 100, the first notch 2203 on the inner saw head 220 and the second notch 3202 on the outer saw head 320 are opposite.

[0080] In an embodiment, the inner saw head 220 comprises:

[0081] a first connecting section 221 fixedly connected to one end of the inner cutter tube 210 away from the transmission shaft 100;

[0082] a first saw head section 222 provided at one end of the first connecting section 221 away from the inner cutter tube 210, the receiving hole 2202 and the first notch 2203 being provided on the first saw head section 222;

[0083] wherein the outer diameter of the first saw head section 222 is greater than or equal to the outer diameter of the first connecting section 221.

[0084] Referring to Figure 3In the embodiment of the utility model, the inner saw head 220 includes a first connecting section 221 and a first saw head section 222, the first connecting section 221 is connected to the inner cutter tube 210, the first saw head section 222 is provided with an inner ring saw tooth 2201, a receiving hole 2202 and a first gap 2203, and the outer diameter of the first saw head section 222 is not less than that of the first connecting section 221. The outer diameter of the first saw head section 222 is relatively thick, has high strength, is not easy to be damaged when sawing bone tissue, and is convenient for setting a larger receiving hole 2202 and a first gap 2203, so that a larger sawing hole can be realized and the sawed bone tissue can be taken out more conveniently. The outer diameter of the first connecting section 221 is relatively thin, which is conducive to ensuring that there is a gap between the first connecting section 221 and the inner wall of the outer saw head 320, avoiding friction between the inner saw head 220 and the outer saw head 320, and prolonging the service life of the medical ring saw.

[0085] In an embodiment, the outer saw head 320 includes:

[0086] A second connecting section 321 is fixedly connected to one end of the outer cutter tube 310 away from the transmission shaft 100, and a second gap 3202 is arranged on the second connecting section 321.

[0087] A second saw head section 322 is arranged on one end of the second connecting section 321 away from the outer cutter tube 310.

[0088] The outer diameter of the second saw head section 322 is greater than or equal to that of the second connecting section 321.

[0089] Referring to Figure 2 In the embodiment of the utility model, the outer saw head 320 includes a second connecting section 321 and a second saw head section 322, the second connecting section 321 is connected to the outer cutter tube 310 and is provided with a second gap 3202, the second saw head section 322 is provided with an outer ring saw tooth 3201, and the outer diameter of the second saw head section 322 is not less than that of the second connecting section 321. The outer diameter of the second saw head section 322 is relatively thick, has high strength, and is not easy to be damaged when sawing bone tissue. In the embodiment, the outer diameter of the second saw head section 322 increases from one end connected to the second connecting section 321 to one end provided with the outer ring saw tooth 3201.

[0090] In an embodiment, the transmission shaft 100 has two coaxial sections with different diameters, the inner cutter tube 210 is fixedly connected to the section with a smaller diameter of the transmission shaft 100, and the outer cutter tube 310 is fixedly connected to the section with a larger diameter of the transmission shaft 100.

[0091] In the embodiment of the utility model, the transmission shaft 100 has two coaxial segments (not shown) with different diameters, the inner cutter tube 210 is sleeved on the segment with smaller diameter of the transmission shaft 100 and is fixed by welding or interference fit, the outer cutter tube 310 is sleeved on the segment with larger diameter of the transmission shaft 100 and is fixed by welding or interference fit, so that the transmission shaft 100 is directly connected with the inner cutter tube 210 and the outer cutter tube 310, thereby realizing synchronous rotation of the inner cutter tube 210 and the outer cutter tube 310, and further realizing synchronous rotation of the inner ring saw teeth 2201 on the inner saw head 220 and the outer ring saw teeth 3201 on the outer saw head 320, so that the utility model has the advantages of simple structure and easy manufacturing.

[0092] In an embodiment, the medical ring saw further comprises:

[0093] The inner saw handle 500 is connected with the inner cutter tube 210 at one end and connected with the transmission shaft 100 at the other end;

[0094] The elastic member 800 is arranged between the inner saw handle 500 and the transmission shaft 100; wherein,

[0095] One of the transmission shaft 100 and the inner saw handle 500 is provided with a clamping groove 101, and the other of the transmission shaft 100 and the inner saw handle 500 is provided with a clamping protrusion 501 corresponding to the clamping groove 101;

[0096] The elastic member 800 is compressed, the clamping protrusion 501 is inserted into the clamping groove 101, the transmission shaft 100 is combined with the inner saw handle 500, and the transmission shaft 100 drives the inner saw handle 500 to rotate;

[0097] The elastic member 800 is released, the clamping protrusion 501 is separated from the clamping groove 101, the transmission shaft 100 is separated from the inner saw handle 500, and the inner saw handle 500 stops rotating.

[0098] In combination with Figure 1 And Figure 5In the embodiment of the utility model, the medical ring saw further comprises an inner saw handle 500 and an elastic member 800, the transmission shaft 100 and the inner saw handle 500 are matched and docked through the clamping protrusion 501 and the clamping groove 101, when the medical ring saw is not used, the clamping protrusion 501 is withdrawn from the clamping groove 101 under the action of the elastic member 800, the transmission shaft 100 and the inner saw handle 500 are not connected, even if the transmission shaft 100 rotates, the inner saw head 220 and the outer saw head 320 also will not rotate, when the bone tissue is to be ring cut, the inner ring saw tooth 2201 on the inner saw head 220 first contacts and is stressed with the bone tissue, the inner ring saw assembly 200 axially slides as a whole, the clamping protrusion 501 on the inner saw handle 500 is inserted into the clamping groove 101 on the transmission shaft 100, the transmission shaft 100 can drive the inner saw handle 500 and the outer saw handle 600 to rotate synchronously, so the inner saw head 220 and the outer saw head 320 rotate synchronously, in this process, the elastic member 800 is deformed under stress, when the bone tissue is cut through, the inner ring saw assembly 200 is not stressed any more, the elastic member 800 restores its deformation, the clamping protrusion 501 is withdrawn from the clamping groove 101, the inner saw handle 500 is disconnected with the transmission shaft 100, the inner ring saw tooth 2201 and the outer ring saw tooth 3201 stop rotating simultaneously, realizing the function of stopping when ring cutting, through the cooperation of the clamping protrusion 501 and the clamping groove 101 and the elastic ability of the elastic member 800, the sawing automatic stop function of the medical ring saw is realized, the structure is simple, easy to realize, the safety of the medical ring saw is improved, thereby the safety of the operation is improved.

[0099] In an embodiment, the medical ring saw further comprises:

[0100] The housing 400, the inner saw handle 500 is rotatably arranged in the housing 400, and the transmission shaft 100 is partially arranged in the housing 400 and the part of the transmission shaft 100 extending into the housing 400 is sleeved with the first bearing 910;

[0101] The outer saw handle 600 is rotatably arranged in the housing 400, the second bearing 920 is sleeved between the outer saw handle 600 and the housing 400, the outer saw handle 600 is sleeved on the inner saw handle 500 and one end of the outer saw handle 600 is connected with the outer cutter tube 310 and the other end of the outer saw handle 600 is connected with the transmission shaft 100;

[0102] The synchronous connection structure 700 connects the inner saw handle 500 and the outer saw handle 600 to make the inner saw handle 500 and the outer saw handle 600 rotate synchronously.

[0103] Referring to Figure 1 And Figure 4In the embodiment of the utility model, medical ring saw includes casing 400, outer saw handle 600 and synchronous connection structure 700, inner saw handle 500 connects inner cutter pipe 210, outer saw handle 600 is set up in the outside of inner saw handle 500 and is connected with outer cutter pipe 310, synchronous connection structure 700 connects inner saw handle 500 and outer saw handle 600, so that inner saw handle 500 and outer saw handle 600 can rotate synchronously, so that inner cutter pipe 210 and outer cutter pipe 310 rotate synchronously, and then make inner saw head 220 and outer saw head 320 rotate synchronously. Synchronous connection structure 700 can adopt buckle, thread, pin shaft 710 and so on to realize the connection of inner saw handle 500 and outer saw handle 600, and the structure is simple, easy to manufacture, realizes the start-stop of inner ring saw tooth 2201 and outer ring saw tooth 3201. In addition, outer saw handle 600 is set on inner saw handle 500, and the double-layer structure enhances the stability of outer saw handle 600 and inner saw handle 500, reduces the vibration in operation, so that sawing is more stable. Furthermore, since inner saw handle 500 and outer saw handle 600 are separate parts, can be maintained and replaced by disassembling, and the maintenance of medical ring saw is convenient. Wherein, the part of transmission shaft 100 that stretches into casing 400 is sleeved with first bearing 910, and second bearing 920 is sleeved between outer saw handle 600 and casing 400, the fluency of transmission shaft 100 and outer saw handle 600 in casing 400 is improved by setting first bearing 910 and second bearing 920, so as to ensure the sawing efficiency of medical ring saw, improve ring saw precision, and reduce the possibility of medical ring saw jam.

[0104] In an embodiment, the synchronous connection structure 700 includes a pin hole 720 and a pin shaft 710, one of the inner wall of the outer saw handle 600 and the outer wall of the inner saw handle 500 is provided with the pin shaft 710, the other of the inner wall of the outer saw handle 600 and the outer wall of the inner saw handle 500 is provided with the pin hole 720 extending along the axial direction of the transmission shaft 100, the pin shaft 710 is inserted into the pin hole 720 and the pin shaft 710 and the pin hole 720 are relatively slidable along the axial direction of the transmission shaft 100, so that the inner saw handle 500 and the outer saw handle 600 rotate synchronously and the inner saw handle 500 is axially movable relative to the outer saw handle 600.

[0105] Referring to Figure 4 and Figure 5In the embodiment of the utility model, the synchronous connection structure 700 includes a pin hole 720 and a pin shaft 710, the pin shaft 710 can be arranged on the inner wall of the outer saw handle 600 and the pin hole 720 can be correspondingly arranged on the outer wall of the inner saw handle 500, or the pin hole 720 can be arranged on the inner wall of the outer saw handle 600 and the pin shaft 710 can be correspondingly arranged on the outer wall of the inner saw handle 500, the pin shaft 710 is inserted into the pin hole 720 to make the outer saw handle 600 and the inner saw handle 500 rotate synchronously. Moreover, the pin hole 720 extends along the axial direction of the transmission shaft 100, that is, the length of the pin hole 720 along the axial direction of the transmission shaft 100 is greater than the outer diameter of the pin shaft 710, so that the pin shaft 710 and the pin hole 720 can relatively slide along the axial direction of the transmission shaft 100, and thus the outer saw handle 600 and the inner saw handle 500 can relatively slide along the axial direction, thereby realizing the butt joint or separation of the inner saw handle 500 and the transmission shaft 100. Through the arrangement of the pin shaft 710 and the pin hole 720, the synchronous rotation of the inner saw handle 500 and the outer saw handle 600 is realized, and the relative sliding of the inner saw handle 500 and the outer saw handle 600 in the axial direction is also realized, so that the structure is simple, the number of parts is small, and the structure of the medical ring saw is more compact.

[0106] In an embodiment, the inner saw handle 500 includes a first section 510, a second section 520 and a third section 530 connected in sequence, the outer diameters of the first section 510, the second section 520 and the third section 530 increase in sequence, the inner cutter tube 210 is arranged outside the first section 510 and connected with the first section 510, the outer cutter tube 310 is arranged outside the second section 520 and has a gap with the second section 520, one end of the outer saw handle 600 is arranged outside the outer cutter tube 310 and connected with the outer cutter tube 310, the other end of the outer saw handle 600 is arranged outside the third section 530 and has a gap with the third section 530, and the synchronous connection structure 700 connects the third section 530 and the outer saw handle 600.

[0107] Referring to Figure 4 Figure 4In the embodiment of the utility model, inner saw handle 500 includes first section 510, second section 520 and third section 530 that are connected in turn, and the outer diameter of first section 510, second section 520 and third section 530 increases in turn. Among them, inner cutter tube 210 is sleeved on the outside of first section 510 and is connected with first section 510, which guarantees the connection tightness of inner cutter tube 210 and inner saw handle 500, reduces the possibility of separation of inner cutter tube 210 and inner saw handle 500, and makes the structure between inner saw handle 500 and inner cutter tube 210 more compact. Outer cutter tube 310 is sleeved on the outside of second section 520 and has a gap, and outer saw handle 600 is sleeved on the outside of third section 530 and has a gap, which avoids the friction between inner saw handle 500 and outer cutter tube 310 and outer saw handle 600, and prolongs the service life of the medical ring saw. One end of outer saw handle 600 is sleeved on the outside of outer cutter tube 310 and is connected with outer cutter tube 310, and the other end of outer saw handle 600 is sleeved on the outside of third section 530 and has a gap with third section 530, so that the structure between inner saw handle 500, outer saw handle 600 and outer cutter tube 310 is more compact.

[0108] The utility model also provides a medical ring cutting device, which comprises:

[0109] The medical ring saw described above; and

[0110] The driving mechanism is drivingly connected with the transmission shaft 100, and drives the inner ring saw teeth 2201 and the outer ring saw teeth 3201 to rotate synchronously through the transmission shaft 100.

[0111] The specific structure of the medical ring saw is the same as that of the above-mentioned embodiments. Since the medical ring cutting device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. In this embodiment, the driving mechanism is drivingly connected with the transmission shaft 100. When the transmission shaft 100 is connected with the inner saw handle 500, the driving mechanism drives the inner saw handle 500 to rotate through the transmission shaft 100, and further drives the inner ring saw teeth 2201 and the outer ring saw teeth 3201 to rotate synchronously. The driving mechanism can be arranged on the handle to form a handheld medical ring cutting device, or the driving mechanism can be arranged on the workbench to form a table type medical ring cutting device.

[0112] The above-mentioned is only the exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A medical bone ring saw, characterized by, The utility model relates to a kind of ring saws, including: Transmission shaft; Outer cutter tube, the outer cutter tube proximal end connects the transmission shaft; Outer saw head, one end of the outer saw head is fixedly connected to the distal end of the outer cutter tube, and the end of the end away from the outer cutter tube is provided with annularly arranged outer ring saw teeth; Inner ring saw assembly, inner sleeve in the outer cutter tube, one end of the inner ring saw assembly is connected to the transmission shaft, the other end is extended from the end of the outer saw head away from the outer cutter tube and is provided with annularly arranged inner ring saw teeth, the transmission shaft drives the outer cutter tube and the inner ring saw assembly synchronous rotation, in turn drive the inner ring saw teeth and the outer ring saw teeth synchronous rotation.

2. A medical ring saw as claimed in claim 1, characterized in that The inner ring saw assembly includes: Inner cutter tube, inner sleeve in the outer cutter tube, one end of the inner cutter tube is connected to the transmission shaft, and the other end extends in the direction away from the transmission shaft;And, Inner saw head, fixedly connected to the end of the inner cutter tube away from the transmission shaft, the end of the inner saw head away from the inner cutter tube is provided with a receiving hole, and the inner ring saw teeth are arranged on the periphery of the receiving hole.

3. A medical ring saw as claimed in claim 2, characterized in that The sidewall of the inner saw head is provided with a first notch, and the first notch penetrates the sidewall of the inner saw head to communicate the inside of the outer saw head and the receiving hole; The sidewall of the outer saw head is provided with a second notch opposite to the first notch, the second notch penetrates the sidewall of the outer saw head to communicate the outside of the outer saw head with the receiving hole, and the size of the second notch is greater than or equal to the size of the first notch.

4. A medical ring saw as claimed in claim 3, characterized in that The inner saw head includes: First connecting section, fixedly connected to the end of the inner cutter tube away from the transmission shaft; First saw head section, provided on the end of the first connecting section away from the inner cutter tube, the receiving hole and the first notch are both provided on the first saw head section; Wherein, the outer diameter of the first saw head section is greater than or equal to the outer diameter of the first connecting section.

5. A medical ring saw as claimed in claim 3, characterized in that The outer saw head includes: Second connecting section, fixedly connected to the end of the outer cutter tube away from the transmission shaft, and the second notch is provided on the second connecting section; Second saw head section, provided on the end of the second connecting section away from the outer cutter tube; Wherein, the outer diameter of the second saw head section is greater than or equal to the outer diameter of the second connecting section.

6. A medical ring saw as claimed in claim 2, characterized in that The transmission shaft has two coaxial sections with different diameters, the inner cutter tube is fixedly connected to the section with smaller diameter of the transmission shaft, and the outer cutter tube is fixedly connected to the section with larger diameter of the transmission shaft.

7. A medical ring saw as claimed in claim 2, characterized in that Further including: Inner saw handle, one end of the inner saw handle is connected to the inner cutter tube, and the other end is connected to the transmission shaft; Elastic member, provided between the inner saw handle and the transmission shaft;Wherein, One of the transmission shaft and the inner saw handle is provided with a clamping groove, and the other of the transmission shaft and the inner saw handle is provided with a clamping protrusion corresponding to the clamping groove; The elastic member is compressed, the clamping protrusion is inserted into the clamping groove, the transmission shaft is combined with the inner saw handle, and the transmission shaft drives the inner saw handle to rotate; The elastic member is released, the clamping protrusion is out of the clamping groove, the transmission shaft is separated from the inner saw handle, and the inner saw handle stops rotating.

8. A medical ring saw as claimed in claim 7, characterized in that Further including: A housing, the inner saw handle is rotatably arranged in the housing, the transmission shaft is partially arranged in the housing and the part of the transmission shaft extending out of the housing is sleeved with a first bearing; An outer saw handle is rotatably arranged in the housing, the outer saw handle is sleeved with a second bearing between the outer saw handle and the housing, the outer saw handle is sleeved with the inner saw handle and one end of the outer saw handle is connected with the outer blade tube and the other end of the outer saw handle is connected with the transmission shaft; A synchronous connection structure is connected with the inner saw handle and the outer saw handle to make the inner saw handle and the outer saw handle rotate synchronously.

9. A medical ring saw as claimed in claim 8, characterized in that The synchronous connection structure comprises a pin hole and a pin shaft, one of the inner wall of the outer saw handle and the outer wall of the inner saw handle is provided with the pin shaft, the other of the inner wall of the outer saw handle and the outer wall of the inner saw handle is provided with the pin hole extending along the axial direction of the transmission shaft, the pin shaft is inserted into the pin hole and the pin shaft and the pin hole can slide relatively along the axial direction of the transmission shaft, so that the inner saw handle and the outer saw handle rotate synchronously and the inner saw handle can move axially relative to the outer saw handle.

10. A medical ring saw as claimed in claim 9, characterized in that The inner saw handle comprises a first segment, a second segment and a third segment connected in sequence, the outer diameters of the first segment, the second segment and the third segment increase in sequence, the inner blade tube is sleeved with the outside of the first segment and connected with the first segment, the outer blade tube is sleeved with the outside of the second segment and has a gap with the second segment, one end of the outer saw handle is sleeved with the outside of the outer blade tube and connected with the outer blade tube, the other end of the outer saw handle is sleeved with the outside of the third segment and has a gap with the third segment, and the synchronous connection structure is connected with the third segment and the outer saw handle.

11. A medical resection device, characterized by The medical trephine comprises: The medical trephine according to any one of claims 1 to 10; And A driving mechanism is drivingly connected with the transmission shaft to drive the inner ring saw teeth and the outer ring saw teeth to rotate synchronously through the transmission shaft.

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