Adjustable medical reamer

Abstract

This invention relates to an adjustable medical reamer, comprising: an outer tube having an inner channel and a through-hole communicating with the inner channel, one end of the inner channel being an open opening located at the beginning of the outer tube, and the through-hole located at the end of the side wall of the outer tube; a drive rod inserted into the inner channel and rotatable relative to the inner channel; a drive head located in the inner channel and connected to the end of the drive rod, the drive head being configured to move along the extension direction of the inner channel as the drive rod rotates; and two sets of cutting tools disposed opposite to each other on the drive head, the two sets of cutting tools being located in the inner channel and their cutting edges extending from the through-hole; the distance between the cutting edges of the two sets of cutting tools changing with the movement of the drive head, so as to realize the control of the movement of the drive head by rotating the drive rod, thereby controlling the cutting diameter of the adjustable medical reamer.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to an adjustable medical reamer. Background Technology

[0002] In orthopedic surgery, medical reamers are commonly used to cut or modify tissues such as articular cartilage, medullary cavity, and intervertebral space. Traditional medical reamers have a fixed diameter, requiring surgeons to prepare multiple reamers of different sizes depending on the size of the surgical site. However, this approach has several drawbacks: it increases preoperative instrument preparation time and procurement costs; changing reamers during surgery is inconvenient and affects surgical efficiency; and frequent instrument changes may increase the risk of infection. Summary of the Invention

[0003] In view of the above analysis, the present invention aims to provide an adjustable medical reamer to at least solve one of the above problems.

[0004] This invention discloses an adjustable medical reamer, comprising:

[0005] The outer tube has an inner channel and a through-hole that communicates with the inner channel. One end of the inner channel is an open opening located at the beginning of the outer tube, and the through-hole is located at the end of the side wall of the outer tube.

[0006] A transmission core rod is inserted into the inner channel and is rotatable relative to the inner channel;

[0007] A transmission head, located in the inner channel and connected to the end of the transmission core rod, is configured to move along the extension direction of the inner channel as the core rod rotates.

[0008] Two sets of cutting tools are arranged opposite to each other on the transmission head. The two sets of cutting tools are located in the inner channel and the cutting edges extend out from the through-hole. The distance between the cutting edges of the two sets of cutting tools changes with the movement of the transmission head, so as to realize the control of the movement of the transmission head by rotating the transmission core rod, thereby controlling the cutting diameter of the adjustable medical reamer.

[0009] Furthermore, the rotation direction of the transmission core rod is different, the movement direction of the transmission head is also different, and the cutting diameter of the reamer changes in different ways.

[0010] Furthermore, the rotational motion of the transmission core rod is converted into the linear motion of the transmission head through threaded transmission.

[0011] Furthermore, one of the ends of the transmission core rod and the beginning of the transmission head is provided with a threaded portion, and the other is provided with a threaded groove that mates with the threaded portion.

[0012] The transmission core rod includes a main rod and a limiting protrusion disposed on the side wall of the main rod, wherein the diameter of the limiting protrusion is larger than the diameter of the main rod;

[0013] The inner channel is provided with a limiting section that is adapted to the limiting protrusion. The limiting section is configured to ensure that the transmission core rod can only rotate relative to the outer sleeve and cannot move axially within the inner channel.

[0014] The connector is provided with a limiting groove that extends radially through the connector, and the two ends of the first limiting pin pass through the limiting groove and are fixedly connected to the outer sleeve.

[0015] The length of the limiting groove defines the length by which the connector can move axially within the inner channel.

[0016] Furthermore, the diameter of the limiting protrusion is larger than the diameter of the main rod;

[0017] The main rod is provided with a rotating handle at its head end, and the rotating handle is located above the opening of the inner channel.

[0018] Furthermore, the end of the transmission head is provided with an inverted T-shaped protrusion, and the T-shaped protrusion and the end of the transmission head limit two oppositely arranged sliding grooves;

[0019] Two cutting tools are arranged opposite each other in two slide grooves. When the transmission head moves in the inner channel, the cutting tools can move radially in the slide grooves.

[0020] The cutting tool has a slide bar at its head that is adapted to the slide groove. The slide bar is embedded in the slide groove and can move along the extension direction of the slide groove.

[0021] Furthermore, the outer wall of the cutting tool is provided with an oblique guide groove, and the extension direction of the oblique guide groove is an oblique line intersecting the extension direction of the slide bar;

[0022] The inner wall of the outer sleeve is provided with a guide bar that is adapted to the inclined guide groove, and the guide bar is embedded in the inclined guide groove.

[0023] Furthermore, the inner end and the outer end of the cutting tool are connected by an angled end;

[0024] The inner bottom wall of the outer sleeve is provided with a support block that is adapted to the inclined end and the end of the cutter, and the inclined end and the end of the cutter abut against the support block.

[0025] Furthermore, the outer tube includes a detachably disposed grip handle and a main body, with the grip handle located above the main body;

[0026] The grip handle and the main body together define the inner channel and the limiting section. The opening of the inner channel is located at the first end of the grip handle, and the through-hole, guide bar, and support block are all located in the main body.

[0027] The end of the grip handle is limited to the beginning of the limiting segment.

[0028] Furthermore, the limiting protrusion is provided with an indicator thread section, and an indicator sleeve that matches it is fitted on the indicator thread section;

[0029] The indicator sleeve is located in the limiting section of the inner channel, the limiting section is provided with an indicator window, and the indicator window is surrounded by a scale for indicating the cutting diameter;

[0030] The indicator screw sleeve is provided with an indicator pin, one end of which is fixedly connected to the indicator screw sleeve, and the other end passes through the indicator window and is exposed or located inside the indicator window and can be seen from the outside.

[0031] The indicator sleeve is configured to be able to make axial displacement with the rotation of the inner core rod, and to establish a correlation between the displacement distance of the indicator sleeve and the cutting diameter of the reamer;

[0032] The indicator threaded sleeve has a limiting window, and the inner wall of the limiting section is provided with a second limiting pin. One end of the second limiting pin is fixedly connected to the inner wall of the limiting section, and the other end of the second limiting pin extends into the limiting window, and the second limiting pin does not contact the indicator threaded section.

[0033] Compared with the prior art, at least one of the beneficial effects of the present invention is that the distance between the two cutting edges at the front end (i.e., the cutting diameter) can be adjusted by rotating the transmission core rod, so as to "meet multiple diameter requirements with one instrument", thereby simplifying the surgical procedure, reducing costs, and improving the convenience and safety of operation.

[0034] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0035] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0036] Figure 1 (a) is a schematic diagram of the adjustable medical reamer with the smallest cutting diameter in a specific embodiment (I);

[0037] Figure 1 (b) is a partial enlarged view (a) of the adjustable medical reamer at its smallest cutting diameter in the specific embodiment.

[0038] Figure 1 (c) is a partial enlarged view (II) of the adjustable medical reamer at its smallest cutting diameter in the specific embodiment;

[0039] Figure 1 (d) is a schematic diagram of the adjustable medical reamer with the smallest cutting diameter in the specific implementation (II);

[0040] Figure 2 (a) is a cross-sectional view of the adjustable medical reamer in the specific embodiment at its minimum cutting diameter;

[0041] Figure 2 (b) is a partially enlarged cross-sectional view (a) of the adjustable medical reamer in the specific embodiment at its smallest cutting diameter;

[0042] Figure 2 (c) is a partially enlarged cross-sectional view (II) of the adjustable medical reamer in the specific embodiment when the cutting diameter is at its minimum.

[0043] Figure 3 (a) is a schematic diagram of the adjustable medical reamer in the specific embodiment with its cutting diameter at its minimum and after the outer sleeve is removed;

[0044] Figure 3 (b) is a partial enlarged view (a) of the adjustable medical reamer in the specific embodiment with its cutting diameter at its minimum and after removing the outer tube;

[0045] Figure 3 (c) is a partial enlarged view (II) of the adjustable medical reamer in the specific embodiment when the cutting diameter is at its minimum and the outer sleeve is removed;

[0046] Figure 4 (a) is a schematic diagram of the transmission core rod in a specific embodiment;

[0047] Figure 4 (b) is a partial enlarged view (a) of the transmission core rod in the specific implementation embodiment;

[0048] Figure 4 (c) is a partial enlarged view (ii) of the transmission core rod in the specific implementation embodiment;

[0049] Figure 5 (a) is a schematic diagram of the outer sleeve in a specific embodiment (I);

[0050] Figure 5 (b) is a partial enlarged view of the outer tube in the specific embodiment;

[0051] Figure 6 (a) is a cross-sectional view (a) of the outer sleeve in a specific embodiment;

[0052] Figure 6 (b) is a partially enlarged cross-sectional view (a) of the outer sleeve in the specific embodiment;

[0053] Figure 6 (c) is a partial enlarged view (ii) of the cross-sectional view of the outer sleeve in the specific embodiment;

[0054] Figure 6 (d) is a cross-sectional view (ii) of the outer sleeve in a specific embodiment;

[0055] Figure 7 (a) is a schematic diagram of the transmission head in a specific implementation (I);

[0056] Figure 7 (b) is a schematic diagram of the transmission head in a specific implementation (II);

[0057] Figure 7 (c) is a cross-sectional view (a) of the transmission head in a specific embodiment;

[0058] Figure 7 (d) is a cross-sectional view (ii) of the transmission head in a specific embodiment;

[0059] Figure 8 (a) is a schematic diagram of the tool structure in a specific embodiment (I);

[0060] Figure 8 (b) is a schematic diagram of the tool structure in a specific embodiment (II);

[0061] Figure 9 (a) is a schematic diagram of the adjustable medical reamer in the specific embodiment when the cutting diameter is at its maximum;

[0062] Figure 9 (b) is a partial enlarged view (a) of the adjustable medical reamer in the specific embodiment when the cutting diameter is at its maximum.

[0063] Figure 9 (c) is a partial enlarged view (II) of the adjustable medical reamer in the specific embodiment when the cutting diameter is at its maximum.

[0064] Figure 10 (a) is a schematic diagram of the adjustable medical reamer after removing the outer tube when the cutting diameter is at its maximum in a specific embodiment;

[0065] Figure 10 (b) is a partial enlarged view (a) of the adjustable medical reamer after removing the outer tube when the cutting diameter is at its maximum in the specific embodiment.

[0066] Figure 10(c) is a partial enlarged view (II) of the adjustable medical reamer after removing the outer tube when the cutting diameter is at its maximum in the specific embodiment;

[0067] Figure 11 This is a schematic diagram of the scale outside the indicator window of the adjustable medical reamer in a specific embodiment.

[0068] Figure label:

[0069] 1-Outer tube; 101-Through opening; 102-Indicator window; 1a-Holding handle; 1b-Main body; 11-Inner channel; 111-Limiting section; 12-Guide bar; 13-Support block; 2-Transmission core rod; 21-Threaded part; 22-Main rod; 23-Limiting protrusion; 231-Indicating threaded section; 24-Rotating handle; 3-Transmission head; 31-Threaded groove; 32-Limiting through groove; 33-Inverted T-shaped protrusion; 34-Slide groove; 4-Cut tool; 41-Cutting edge; 42-Slide bar; 43-Angled guide groove; 44-Angled end; 5-First limiting pin; 6-Indicating sleeve; 61-Indicating pin; 62-Limiting window; 7-Second limiting pin. Detailed Implementation

[0070] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0071] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0072] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0073] The working surface of this invention can typically be a plane or a curved surface, and can be inclined or horizontal. For ease of explanation, the embodiments of this invention are placed on a horizontal surface and used on a horizontal surface, thereby defining "height" and "vertical".

[0074] One specific embodiment of the present invention discloses an adjustable medical reamer, such as... Figures 1-11 As shown, it includes:

[0075] The outer tube 1 has an inner channel 11 and an opening 101 that is oppositely arranged and communicates with the inner channel. One end of the inner channel 11 is an open opening located at the beginning of the outer tube 1, and the opening 101 is located at the end of the side wall of the outer tube 1, that is, the end side wall of the inner channel 11 has an opposite opening 101.

[0076] The transmission core rod 2 is inserted into the inner channel 11 and can rotate within the inner channel 11, that is, the transmission core rod 2 can rotate around the center line OO of the inner channel 11. Preferably, the center lines of the outer sleeve 1 and the transmission core rod 2 are both coincident with the center line OO.

[0077] The transmission head 3 is located in the inner channel 11 and connected to the end of the transmission core rod 2. The transmission head 3 is configured to move along the extension direction of the inner channel 11 as the transmission core rod 2 rotates, that is, the transmission head can move along the center line direction of the inner channel as the transmission core rod rotates. Preferably, the center line of the transmission head 3 coincides with the center line, that is, the transmission head 3 moves axially as the transmission core rod 2 rotates.

[0078] Two sets of cutting tools 4 are arranged opposite to each other on the transmission head 3. The two sets of cutting tools 4 are located in the inner channel and the cutting edges 41 protrude from the through hole 101. The distance between the cutting edges of the two sets of cutting tools 4 changes with the movement of the transmission head 3, so as to realize the control of the movement of the transmission head by rotating the transmission core rod, thereby controlling the cutting diameter of the adjustable medical reamer (i.e., the distance between the cutting edges of the two sets of cutting tools), that is, converting the axial movement of the transmission head 3 into the radial movement of the two sets of cutting tools.

[0079] It should be noted that the cutting tool 4 has a cutting edge 41 on only one side, and the cutting edge 41 is located on the side away from the center line OO. Therefore, the cutting edge distance 41 between the two cutting tools is the cutting diameter of the reamer. In other words, the two cutting edges of the two cutting tools 4 constitute the cutting edges on both sides of the reamer.

[0080] The adjustable medical reamer of the present invention (hereinafter referred to as reamer) can adjust the distance between the two cutting edges at the front end (i.e., the cutting diameter) by rotating the transmission core rod, so as to achieve "one instrument to meet multiple diameter requirements", thereby simplifying the surgical procedure, reducing costs, and improving the convenience and safety of operation.

[0081] The rotation direction of the transmission core rod 2 varies, as does the movement direction of the transmission head 3 (including upward and downward movement), and the way the cutting diameter of the reamer changes (including increasing and decreasing the cutting diameter). For example, the rotation direction of the transmission core rod 2 includes a first rotation direction and a second rotation direction. When the rotation direction of the transmission core rod 2 is the first rotation direction, the transmission head 3 moves upward within the inner channel, and the cutting edges of the two tools 4 move back to back, i.e., the distance between the two cutting edges increases, and the cutting diameter increases. When the rotation direction of the transmission core rod is the second rotation direction, the transmission head 3 moves downward within the inner channel, and the cutting edges of the two tools 4 move towards each other, i.e., the distance between the two cutting edges decreases, and the cutting diameter decreases. It should be noted that in practical applications, different variation rules can also be set. For example, when the rotation direction of the transmission core rod 2 is the first rotation direction, the transmission head can also be set to move downward within the inner channel; when the transmission head moves upward within the channel, the cutting edges of the two tools can also move relative to each other. The specific variation rules can be set according to actual needs.

[0082] According to one embodiment of the present invention, the rotational motion of the transmission core rod 2 is converted into the linear motion of the transmission head 3 through threaded transmission. Specifically, one of the end of the transmission core rod 2 and the beginning of the transmission head 3 is provided with a threaded portion, and the other is provided with a threaded groove that mates with the threaded portion. In this embodiment, the end of the transmission core rod 2 is provided with a threaded portion 21, and the beginning of the transmission head 3 is provided with a threaded groove 31 that mates with the threaded portion 21.

[0083] The transmission core rod 2 includes a main rod 22 and a limiting protrusion 23 disposed on the side wall of the main rod 22. The diameter of the limiting protrusion 23 is larger than the diameter of the main rod 22, and the threaded portion 21 is located at the end of the main rod 22 and has a diameter smaller than the diameter of the main rod 22. To facilitate rotation of the transmission core rod 2, a rotating handle 24 is provided at the beginning of the main rod 22. The rotating handle 24 is located above the opening of the inner channel, and the width of the rotating handle 24 is much larger than the diameter of the main rod 22 and the inner channel 11 to facilitate user operation. To improve the structural stability of the transmission core rod 2, at least the main rod 22, the limiting protrusion 23, and the threaded portion 21 are integrally formed. For easy assembly, the rotating handle 24 is connected to the beginning of the main rod 22 via a connecting pin.

[0084] The inner channel 11 is provided with a limiting section 111 that matches the limiting protrusion 23. The limiting section 111 is configured to ensure that the transmission core rod 2 can only rotate relative to the outer sleeve 1 and cannot move axially within the inner channel 11. Specifically, the limiting protrusion 23 is located within the limiting section 111, that is, the inner diameter of the limiting section 111 is not less than the diameter of the limiting protrusion, and the length of the limiting section 111 is approximately equal to the length of the limiting protrusion 23. Here, "approximately equal" includes being equal to or slightly longer than the length of the limiting protrusion.

[0085] To prevent the connector 3 from rotating with the transmission core rod and to allow the connector 3 to move axially within the inner channel as the transmission core rod rotates, the connector 3 is provided with a radially penetrating limiting groove 32. Both ends of the first limiting pin 5 pass through the limiting groove 32 and are fixedly connected to the outer sleeve 1. The first limiting pin 5 is perpendicular to the center line OO. The length of the limiting groove 32 extends parallel to the center line OO, and the length of the limiting groove 32 is the length by which the connector 3 can move axially within the inner channel. The two ends of the limiting groove 32 are adapted to the shape of the first limiting pin 5, i.e., the shape of the limiting groove 32 is a rounded rectangle. With this configuration, when the transmission core rod 2 rotates, the threaded portion 21 rotates relative to the threaded groove 31. Due to the restriction of the first limiting pin 5, the transmission head 3 cannot rotate and can only move axially within the inner channel with the threaded transmission of the threaded portion and the threaded groove.

[0086] In this embodiment, when the reamer's cutting diameter is at its minimum, the first limiting pin abuts against the bottom end of the limiting channel, such as... Figures 1-3 As shown; when the reamer's cutting diameter is at its maximum, the first limiting pin abuts against the top end of the limiting channel, as... Figures 9-10 As shown. In practical applications, the configuration is not limited to that of this embodiment; the cutting diameter and the contact position of the first limiting pin can be selected according to the actual situation.

[0087] Preferably, the diameter of the transmission head 3 is equal to the diameter of the main rod 22 of the transmission core rod 2.

[0088] The end of the transmission head 3 is provided with an inverted T-shaped protrusion 33. The T-shaped protrusion 33 and the end of the transmission head 33 limit two oppositely arranged sliding grooves 34. The extending direction of the sliding grooves 34 is perpendicular to the center line (i.e., center line OO) of the transmission head 3. Two cutting tools 4 are arranged opposite each other in the two sliding grooves 34. When the transmission head 3 moves in the inner channel 11, the cutting tools 4 can move radially in the sliding grooves 34, thereby increasing or decreasing the distance between the two cutting edges. Specifically, the head of the cutting tool 4 is provided with a slide bar 42 that matches the sliding groove 34. The slide bar 42 is embedded in the sliding groove 34 and can move along the extending direction of the sliding groove 34.

[0089] To convert the axial movement of the transmission head into the radial movement of the cutting tool, the outer wall of the cutting tool 4 is provided with an oblique guide groove 43, the extension direction of which is an oblique line intersecting the extension direction of the slide bar 42. The inner wall of the outer sleeve 1 is provided with a guide bar 12 adapted to the oblique guide groove 43. The guide bar 12 is embedded in the oblique guide groove 43. Under the combined guiding action of the guide bar 12 and the oblique guide groove 43, and the slide bar 42 and the slide groove 34, when the transmission head moves axially, the cutting tool 4 can move radially relative to the outer sleeve 1. It should be noted that the inner wall where the guide bar 12 is located is a side wall with an opening, meaning the guide bar can be seen through the opening.

[0090] The cutting tool 4 has a guide bar 42 at its tip and a cutting edge 41 at its outer end. The outer wall of the cutting tool has an oblique guide groove 3. The outer edge of the cutting edge 41 is positioned to avoid the extending direction of the guide bar and the oblique guide groove 3. The two cutting tools have identical structures and, when positioned opposite each other on the inverted T-shaped protrusion, the two cutting edges are always located on opposite sides of the center line.

[0091] To improve the structural stability of the cutting tool 4, the inner end and the outer end of the cutting tool 4 are connected by an inclined end 44. The inner bottom wall of the outer sleeve 1 is provided with a support block 13 that matches the inclined end 44 and the outer end of the cutting tool. The inclined end 44 and the outer end of the cutting tool 4 abut against the support block 13, making the radial movement of the cutting tool more stable and the structure of the reamer more robust. Preferably, the extension direction of the inclined end 44 is parallel to the extension direction of the inclined guide groove 43.

[0092] The inner channel 11 is adapted to the transmission core rod 2, transmission head 3, and cutter 4 to make the transmission between the various components of the reamer more stable.

[0093] For ease of assembly and operation, the outer sleeve 1 includes a detachable handle 1a and a main body 1b. The handle 1a is located above the main body 1b, and the inner channel 11 extends through the handle and into the main body 1b. The handle 1a and the main body 1b together define the inner channel 11 and the limiting section 111. The opening of the inner channel is located at the beginning of the handle 1a, and the through-hole 101, guide bar 12, and support block 13 are all located in the main body 1b. The end of the handle 1a limits the beginning of the limiting section 111, thus facilitating the smooth insertion of the main rod and transmission head of the transmission core rod by opening the beginning of the limiting section. For example, the grip handle 1a and the main body 1b are connected by threads, that is, one of the beginning end of the main body 1b and the end of the grip handle is provided with a threaded connector, and the other is provided with a threaded groove that mates with the threaded connector. In this embodiment, the end of the grip handle 1a is provided with a threaded connector, and the beginning end of the main body 1b is provided with a threaded groove.

[0094] For ease of operation, the width and thickness of the grip handle 1a are both greater than those of the rotary handle 24. This allows the outer tube to be stabilized by gripping the handle during operation, while the transmission core is rotated by the rotary handle, making the reamer operation more stable and reliable. For example, the width of the rotary handle 24 is twice the width of the rotary handle.

[0095] To facilitate accurate determination of the reamer's cutting diameter during adjustment, the limiting protrusion 23 is provided with an indicating thread section 231, on which a matching indicating thread sleeve 6 is fitted. The indicating thread sleeve 6 is located in the limiting section 111 of the inner channel 11, and the limiting section 111 is provided with an indicating window 102. The indicating thread sleeve 6 is provided with an indicating pin 61, one end of which is fixedly connected to the indicating thread sleeve 6, and the other end passes through the indicating window 102 and is exposed or located within the indicating window 102 and visible from the outside. The indicating window 102 is surrounded by graduations for indicating the cutting diameter, such as... Figure 11 As shown.

[0096] The indicator sleeve 6 is configured to be able to make axial displacement with the rotation of the inner core rod, and to establish a correlation between the displacement distance of the indicator sleeve and the cutting diameter of the reamer. Therefore, the cutting diameter can be determined by the position of the indicator pin on the indicator sleeve 6 in the indicator window.

[0097] In this embodiment, the indicator thread section 231 is located near the end of the limiting protrusion 23, and the indicator pin 61 is located at the end of the outer wall of the indicator thread sleeve.

[0098] The indicator sleeve 6 has a limiting window 62. The inner wall of the limiting segment 111 is provided with a second limiting pin 7. One end of the second limiting pin 7 is fixedly connected to the inner wall of the limiting segment 111, and the other end extends into the limiting window 62. The second limiting pin 7 does not contact the indicator thread segment. This arrangement converts the threaded transmission between the indicator thread segment and the indicator sleeve into axial movement of the indicator sleeve on the indicator thread segment. The limiting window 62 is located above the indicator pin 61 and near the beginning of the sleeve 6. The length of the limiting window 62 is the same as the length of the indicator window 102.

[0099] In this embodiment, when the cutting diameter is at its minimum, the indicator pin 61 abuts against the top of the indicator window 102, and the second limiting pin abuts against the bottom of the limiting window 62; when the cutting diameter is at its maximum, the indicator pin 61 abuts against the bottom of the indicator window 102, and the second limiting pin abuts against the top of the limiting window 62. In practical applications, this configuration is not limited to that of this embodiment; the cutting diameter and the abutment positions of the indicator pin and the second limiting pin can be selected according to actual conditions.

[0100] It should be noted that the axial displacement distance of the threaded sleeve and the transmission head as the transmission core rod rotates can be the same or different. When they are the same, the lengths of the limiting through groove and the indicator window are the same. When they are different, the length ratio of the limiting through groove and the indicator window is related to the thread transmission of the transmission head and the threaded sleeve.

[0101] This invention provides an adjustable medical reamer for tissue cutting and trimming. Compared with the prior art, the advantages of this invention are as follows:

[0102] Reduce costs by replacing multiple fixed-diameter reamers with a single instrument, thereby reducing instrument procurement and management costs;

[0103] Improved efficiency; no instruments need to be changed during surgery; diameter can be adjusted by rotating the transmission core rod, saving surgical time.

[0104] Enhance safety, reduce the number of instrument changes, lower the risk of infection, make the adjustment process controllable, and ensure surgical precision;

[0105] It is highly versatile, with an adjustable diameter range covering various surgical scenarios (such as joint cavities of different sizes), and has a wide range of applications.

[0106] This invention solves the problem of "over-specification" in traditional medical reamers through an innovative adjustable structure. It has the advantages of simple structure, convenient operation, low cost and high safety, and has significant application value and market prospects in the fields of orthopedics, sports medicine and other medical devices.

[0107] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An adjustable medical reamer, comprising: include: The outer tube has an inner channel and a through-hole that communicates with the inner channel. One end of the inner channel is an open opening located at the beginning of the outer tube, and the through-hole is located at the end of the side wall of the outer tube. A transmission core rod is inserted into the inner channel and is rotatable relative to the inner channel; A transmission head, located in the inner channel and connected to the end of the transmission core rod, is configured to move along the extension direction of the inner channel as the transmission core rod rotates. Two sets of cutting tools are arranged opposite to each other on the transmission head. The two sets of cutting tools are located in the inner channel and the cutting edges extend out from the through-hole. The distance between the cutting edges of the two sets of cutting tools changes with the movement of the transmission head, so as to realize the control of the movement of the transmission head by rotating the transmission core rod, thereby controlling the cutting diameter of the adjustable medical reamer.

2. The adjustable medical reamer according to claim 1, wherein, The rotation direction of the transmission core rod is different, the movement direction of the transmission head is also different, and the cutting diameter of the reamer changes in different ways.

3. The adjustable medical reamer according to claim 2, wherein, The transmission core rod converts its rotational motion into the linear motion of the transmission head through threaded transmission.

4. The adjustable medical reamer according to claim 3, wherein, The end of the transmission core rod and the beginning of the transmission head are provided with a threaded part, and the other is provided with a threaded groove that mates with the threaded part. The transmission core rod includes a main rod and a limiting protrusion disposed on the side wall of the main rod, wherein the diameter of the limiting protrusion is larger than the diameter of the main rod; The inner channel is provided with a limiting section that is adapted to the limiting protrusion. The limiting section is configured to ensure that the transmission core rod can only rotate relative to the outer sleeve and cannot move axially within the inner channel. The transmission head is provided with a limiting groove that radially penetrates the transmission head, and the two ends of the first limiting pin pass through the limiting groove and are fixedly connected to the outer sleeve. The length of the limiting groove defines the length by which the transmission head can move axially within the inner channel.

5. The adjustable medical reamer according to claim 4, characterized in that, The diameter of the limiting protrusion is larger than the diameter of the main rod; The main rod is provided with a rotating handle at its head end, and the rotating handle is located above the opening of the inner channel.

6. The adjustable medical reamer of claim 4, wherein, The end of the transmission head is provided with an inverted T-shaped protrusion, and the T-shaped protrusion and the end of the transmission head limit two oppositely arranged sliding grooves; Two cutting tools are arranged opposite each other in two slide grooves. When the transmission head moves in the inner channel, the cutting tools can move radially in the slide grooves. The cutting tool has a slide bar at its head that is adapted to the slide groove. The slide bar is embedded in the slide groove and can move along the extension direction of the slide groove.

7. The adjustable medical reamer according to claim 6, wherein, The outer wall of the cutting tool is provided with an oblique guide groove, and the extension direction of the oblique guide groove is an oblique line intersecting the extension direction of the slide bar. The inner wall of the outer sleeve is provided with a guide bar that is adapted to the inclined guide groove, and the guide bar is embedded in the inclined guide groove.

8. The adjustable medical reamer according to claim 7, wherein, The inner end and the outer end of the cutting tool are connected by a beveled end; The inner bottom wall of the outer sleeve is provided with a support block that is adapted to the inclined end and the end of the cutter, and the inclined end and the end of the cutter abut against the support block.

9. The adjustable medical reamer of claim 4, wherein, The outer tube includes a detachable grip handle and a main body, with the grip handle located above the main body; The grip handle and the main body together define the inner channel and the limiting section. The opening of the inner channel is located at the first end of the grip handle, and the through-hole, guide bar, and support block are all located in the main body. The end of the grip handle is limited to the beginning of the limiting segment.

10. The adjustable medical reamer according to any one of claims 4 to 9, wherein The limiting protrusion is provided with an indicator thread section, and an indicator sleeve that matches it is fitted on the indicator thread section; The indicator sleeve is located in the limiting section of the inner channel, the limiting section is provided with an indicator window, and the indicator window is surrounded by a scale for indicating the cutting diameter; The indicator screw sleeve is provided with an indicator pin, one end of which is fixedly connected to the indicator screw sleeve, and the other end passes through the indicator window and is exposed or located inside the indicator window and can be seen from the outside. The indicator sleeve is configured to be able to make axial displacement with the rotation of the inner core rod, and to establish a correlation between the displacement distance of the indicator sleeve and the cutting diameter of the reamer; The indicator threaded sleeve has a limiting window, and the inner wall of the limiting section is provided with a second limiting pin. One end of the second limiting pin is fixedly connected to the inner wall of the limiting section, and the other end of the second limiting pin extends into the limiting window, and the second limiting pin does not contact the indicator threaded section.

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