Connection structure and drill tool

Abstract

The present invention relates to a connection structure and a drilling tool, comprising: a connection component, including two or more connection bodies arranged side by side, each connection body extending linearly, the connection body being adapted to bend laterally when subjected to a bending moment, and the connection body being capable of twisting when subjected to a torque; a connection head, connected to the ends of the connection bodies located on the same side, for integrally fixing the ends of the connection bodies. In this embodiment, when the connection body is subjected to a positive or negative torque, it will twist accordingly, and twisting in both directions will not damage the structure of the entire connection component; during the operation, when drilling forward and encountering a large resistance from the surrounding tissues, it can timely adjust to reverse rotation or alternate forward and reverse drilling, with better flexibility in use, significantly improving the drilling success rate and the surgical effect; the connection body can timely release elastic potential energy, and even if used frequently, it will not suffer from fatigue damage or softening, and can still ensure the support degree and timely restore the initial state after multiple uses.

Description

Technical Field

[0001] The invention relates to the field of medical device design, in particular to a connecting structure and a drilling tool. Background Art

[0002] Elastic connection structures are widely used in medical device products, and are currently mainly used in soft drills, which are commonly used tools for medullary cavity expansion in orthopedic medical devices. Soft drills are usually connected in sequence by an operating handle, an elastic connection structure, a connection sleeve, and a drill bit. When drilling, the drill is guided by a guide sleeve to change the direction of the drill bit, and the elastic connection structure bends with the guide sleeve. The main function of the elastic connection structure is to connect and support the drill bit, and to help the drill bit turn by bending, and to restore the original state in time after the steering force is removed.

[0003] The spring structure in the soft drill currently used in surgery is wound with spring wire and has high elasticity. Therefore, during the drilling process, the direction can be changed in the guide sleeve. However, the elastic connection structure made of unidirectional multi-strand spring wire can only drill along the direction of the spring wire winding. If reverse drilling is performed, the elastic connection structure has a tendency to rotate in the opposite direction of the spring wire winding direction, and the winding structure of the spring wire may be destroyed, thereby causing damage to the overall structure of the soft drill. Therefore, the traditional elastic connection structure should try to avoid reverse drilling. However, in the actual operation, if the forward drilling is subject to greater resistance from the surrounding tissue, it is necessary to adjust the strategy to reverse drilling or alternate forward and reverse drilling. At this time, the defect of the traditional elastic connection structure that cannot reverse drilling hinders the normal operation, and the surgical operation efficiency is very low, the success rate cannot be guaranteed, and the postoperative effect is poor.

[0004] In addition, the elastic connection structure tightly wound by spring wire itself has high stress, and the drill bit rotates in a single direction for a long time. The spring wire is very easy to fatigue and soften after being used several times, which leads to poor support and inability to return to the original state after being stressed, which directly reduces the service life of the soft drill. Summary of the invention

[0005] Based on this, it is necessary to provide a new connection structure and drilling tool to address the problem that the traditional connection structure cannot rotate in the opposite direction and is prone to fatigue when rotating in one direction.

[0006] A connection structure, comprising:

[0007] A connecting component, comprising two or more connecting bodies arranged side by side, each of the connecting bodies extending linearly, the connecting bodies being used to bend laterally when subjected to bending moment, and the connecting bodies being used to be twisted when subjected to torque;

[0008] The connector is connected to the ends of the connectors on the same side and is used to integrate and fix the ends of the connectors.

[0009] The above connection structure has at least the following beneficial technical effects:

[0010] (1) In this embodiment, when the drill tool rotates forward or backward, a certain degree of torque will be applied to each connecting body. When bearing forward or backward torque, the connecting body will twist accordingly. Since the connecting bodies are arranged side by side, twisting in both directions will not damage the structure of the entire connecting component, enabling the drill tool to have the ability of bidirectional drilling; during the operation, when the forward drilling encounters a large resistance from the surrounding tissues, the reverse rotation or the forward and reverse alternating drilling can be adjusted in time, with better flexibility in use, saving the operation time, and significantly improving the drilling success rate and operation effect;

[0011] (2) The connecting bodies are arranged side by side in the natural state and will not generate internal stress due to winding; and the drill tool can drill forward and backward at intervals. The probability of the connecting body twisting in both directions is the same and it can recover and release elastic potential energy in time. Even if it is used frequently, it will not occur fatigue damage or softening, and it can still ensure the support degree and recover to the initial state in time after multiple uses.

[0012] In one embodiment, the connection structure further includes a fixing component, and the fixing component is circumferentially sleeved on the connection component for restricting the lateral movement of the connecting body.

[0013] In one embodiment, the fixing component includes at least two fixing bodies, and each fixing body is circumferentially sleeved on the connection component at intervals along the extending direction of the connecting body.

[0014] In one embodiment, two or more channels are formed on the fixing component, and each channel is used for one or two or more connecting bodies to pass through.

[0015] In one embodiment, the number of the channels is more than the number of the connecting bodies.

[0016] In one embodiment, the channel includes a first through hole and a plurality of second through holes distributed around the first through hole. Each of the second through holes together forms a plurality of annular through hole groups centered on the first through hole and gradually away from the first through hole, and the diameter of the first through hole is larger than the diameter of the second through hole.

[0017] In one embodiment, the fixing component and the connection component are in interference fit.

[0018] In one embodiment, a plurality of fixing holes are formed on the connection head, and the end parts of each connecting body are respectively positioned and embedded in each fixing hole to be fixed on the connection head.

[0019] A drilling tool includes an operating handle, a drilling component, and any one of the connection structures described above. The connection heads at both ends of the connection structure are respectively connected to the operating handle and the drilling component.

[0020] In one embodiment, the operating handle and the drilling component are respectively movably connected to the corresponding connection heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the connection structure provided by an embodiment of the present invention;

[0022] Figure 2 For Figure 1 Partial structure perspective view;

[0023] Figure 3 For Figure 1 Side view of the fixing component in the connection structure of;

[0024] Figure 4 Schematic diagram of the drilling tool provided by an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the cooperative installation of the connection structure and the operating handle;

[0026] Figure 6 For Figure 4 Bending state diagram of the drilling tool shown;

[0027] In the figure, 10. Connection structure; 11. Connection pin; 20. Operating handle; 30. Drilling component;

[0028] 100. Connection component; 110. Connection body;

[0029] 200. Connection head; 210. Fixing hole;

[0030] 300. Fixing component; 301. First through hole; 302. Second through hole; 310. Fixing body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] For the convenience of understanding the present invention, various embodiments defined by the claims of the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings, which include various specific details to facilitate this understanding, but these details should be regarded as merely exemplary. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Accordingly, those of ordinary skill in the art will recognize that various changes and improvements can be made to the embodiments described herein without departing from the scope of the present invention defined by the appended claims. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and configurations may be omitted.

[0033] It is obvious to those skilled in the art that the following description of the various embodiments of the present invention is for explanatory purposes only and is not intended to limit the present invention defined by the appended claims.

[0034] Throughout the specification and claims of this application, the words "comprising" and "including" and variations of the words, such as "comprises" and "includes", mean "including but not limited to", and are not intended to (and will not) exclude other components, wholes, or steps. Features, wholes, or characteristics described in connection with a particular aspect, embodiment, or example of the present invention will be understood to be applicable to any other aspect, embodiment, or example described herein, unless incompatible therewith.

[0035] It should be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. The expressions "comprising" and / or "may comprise" used in the present invention are intended to indicate the existence of corresponding functions, operations, or elements, and are not intended to limit the existence of one or more functions, operations, and / or elements. In addition, in the present invention, the terms "comprising" and / or "having" are intended to indicate the existence of the features, quantities, operations, elements, and components disclosed in the application document, or combinations thereof. Therefore, the terms "comprising" and / or "having" should be understood to allow for the additional possibility of the existence of one or more other features, quantities, operations, elements, and components, or combinations thereof.

[0036] In the present invention, the expression "or" includes any or all combinations of the recited words. For example, "A or B" may include A or B, or may include both A and B.

[0037] It should be understood that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element; when an element is considered to be "connected" or "coupled" to another element, it can be directly or coupled to the other element or there may be an intermediate element present at the same time.

[0038] The terms "upper", "lower", "left", "right", etc. mentioned in the text are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with the relevant field and the context of this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in this document. The term "and / or" used in this document includes any and all combinations of one or more of the related listed items.

[0040] As Figure 1 shown, in an embodiment of the present invention, a connection structure 10 is provided, including:

[0041] A connection member 100, including more than 2 connection bodies 110 arranged side by side. Each of the connection bodies 110 extends linearly, and the connection body 110 can bend laterally when bearing a bending moment, and the connection body 110 can twist when bearing a torque;

[0042] A connection head 200, connected to the same-side end of each connection body 110 in the extending direction, for integrally fixing the ends of the connection bodies 110.

[0043] The connection body 110 is preferably a filament with flexibility and elasticity, such as spring steel wire, etc. Linear extension means that in the natural state without applying external forces (such as bending moment, torque, etc.), it is generally in a straight line shape parallel to each other, without twisting, intertwining, winding, etc.

[0044] During specific use, the connection structure 10 of this embodiment is pre-installed into the drill tool. During the process of reaming the medullary cavity, the front end of the drill tool is inserted into the interior of the medullary cavity. When the overall extension direction of the medullary cavity changes, the tissue around the connection member 100 exerts lateral forces and bending moments on each connection body 110. After each connection body 110 bears the lateral forces and bending moments, it immediately bends laterally, and at the same time assists the drill bit at the front end of the drill tool to turn. When the drill tool reams the medullary cavity, it will rotate around the center line, and a certain torque will be applied to the connection body 110 during the rotation process, and this torque will promote the connection body 110 to twist.

[0045] (1) In this embodiment, when the drill tool rotates forward or backward, a certain degree of torque is applied to each connecting body 110. When bearing forward or backward torque, the connecting body 110 will twist accordingly. Since the connecting bodies 110 are arranged side by side, twisting in both directions will not damage the structure of the entire connecting component 100, enabling the drill tool to have the ability of bidirectional drilling. During the operation, when the forward drilling encounters a large resistance from the surrounding tissues, the reverse rotation can be adjusted in time, or the forward and reverse drilling can be alternated, which improves the flexibility of use, saves the operation time, and significantly improves the drilling success rate and the surgical effect.

[0046] (2) The connecting bodies 110 are arranged side by side in the natural state and will not generate internal stress due to winding. Moreover, the drill tool can drill forward and backward at intervals. The probability of the connecting body 110 twisting in both directions is the same and the elastic potential energy can be released in time. Even if it is used frequently, fatigue damage and softening will not occur, and the support degree can still be ensured and the initial state can be restored in time after multiple uses.

[0047] Reference Figure 1 , in some embodiments, the connecting structure 10 further includes a fixing component 300, and the fixing component 300 is circumferentially sleeved on the connecting component 100 to limit the lateral (i.e., radial) displacement of the connecting body 110.

[0048] Specifically, when the fixing component 300 is circumferentially sleeved on the surface of the connecting component 100 around the connecting component 100, the fixing component 300 can block and limit the lateral movement of each connecting body 110, thereby being able to limit the overall deformation and breakage of the connecting structure 10 caused by the separation of each connecting body 110 from each other.

[0049] Reference Figure 1 and Figure 2 , in some embodiments, the fixing component 300 includes at least two fixing bodies 310, which are spaced apart along the extension direction of the connecting body 110 and sleeved on the connecting component 100.

[0050] During specific installation, each fixing body 310 can be successively sleeved and installed on the connecting component 100, so as to limit the lateral movement of each connecting body 110 along the extension direction of the connecting body 110 by using each fixing body 310, and the limiting effect is better and more comprehensive. At the same time, the interval between adjacent fixing bodies 310 provides sufficient space for the deformation of the connecting body 110 and will not affect the normal bending of the connecting body 110.

[0051] Certainly, in some other embodiments, the fixing component 300 can be a flexible sleeve that entirely wraps the connecting component 100. On the one hand, the flexible sleeve can limit the lateral movement of the connecting body 110, and on the other hand, it will not have a great limitation on the bending of the connecting body 110.

[0052] Reference Figure 3 In some embodiments, a plurality (more than 2) of channels are formed on the fixing member 300. The channels may be evenly distributed in the radial cross-section of the fixing member 300, or may be dense in the middle and sparse around.

[0053] Each of the channels is respectively used for one or more than 2 of the connectors 110 to pass through, so as to ensure that intervals are formed between the connectors 110. Preferably, each channel is for one of the connectors 110 to pass through, so as to ensure that each connector 110 is spaced from each other and can also prevent the connectors 110 from being entangled with each other.

[0054] During the specific installation operation, the connectors 110 are respectively passed through the corresponding channels. In this embodiment, since each of the connectors 110 passes through each channel, a gap can be formed between adjacent connectors 110. After the surgical operation is completed, the cleaning member can be directly inserted into the gap between adjacent connectors 110 to clean the bone tissue, blood stains, etc. between adjacent connectors 110. Compared with the traditional connection structure 10, the cleaning is more convenient and easier; and the cleaning of bone tissue and blood stains is more thorough, which does not affect the reuse of subsequent surgeries and can also avoid cross-infection during surgeries for different patients.

[0055] In some embodiments, the number of the channels is more than the number of the connectors 110. Specifically, when the number of the channels set is more than the number of the connectors 110, the channels with more suitable positions on the fixing member 300 can be selected according to actual needs and the connectors 110 are passed through them, so that the formed connecting member 100 as a whole has different cross-sectional shapes and different cross-sectional sizes.

[0056] In this embodiment, the cross-sectional size of the connecting member 100 can be changed according to the design of the medullary cavities with different thicknesses and sizes on different patients' bodies, so as to meet various different usage requirements during the surgery. Even the cross-sectional shape of the connecting member 100 can be designed according to the cross-sectional shape of the medullary cavity. The degree of adjustability is high and the usage flexibility is good; in addition, there is no need to prepare a variety of different models of connection structures 10 according to different medullary cavity size requirements, which significantly saves the input cost.

[0057] It can be understood that, in addition to the above embodiments, in some other embodiments, the number of the channels is not limited to being more than the number of the connectors 110, and can also be exactly equal to the number of the connectors 110, which is not limited here.

[0058] Reference Figure 3, in some embodiments, the channel includes a first through-hole 301 and a plurality of second through-holes 302 distributed around the first through-hole 301. Each of the second through-holes 302 together forms a plurality of annular through-hole groups centered on the first through-hole 301 and gradually away from the first through-hole 301.

[0059] Specifically, in actual use, different annular through-hole groups can be selected according to the inner diameter of the medullary cavity. For example, when the inner diameter of the medullary cavity is small, a small-size annular through-hole group close to the first through-hole 301 is selected, and the connecting body 110 is respectively passed through the first through-hole 301 and each of the second through-holes 302 that make up the small-size annular through-hole group, thereby forming a connecting component 100 with a small-size circular cross-section; when the medullary cavity has a large inner diameter, a large-size annular through-hole group far from the first through-hole 301 is selected, and the connecting body 110 is respectively passed through the first through-hole 301 and each of the second through-holes 302 that make up the large-size annular through-hole group, thereby forming a connecting component 100 with a large-size circular cross-section.

[0060] After adopting the setting of this embodiment, a connecting component 100 with different cross-sectional sizes and regular cross-sectional shapes can be formed. The assembly and adjustment operations are simple and convenient. The connecting component 100 formed by the combination of the connecting body 110 passing through the first through-hole 301 at the central part and the surrounding connecting bodies 110 has a relatively high density, which can provide support for the whole connecting component 100, ensure the morphological stability of the elastic connection structure in the natural state, and avoid fatigue damage caused by long-term bending deformation.

[0061] Reference Figure 3 , in some embodiments, the diameter of the first through-hole 301 is larger than the diameter of the second through-hole 302.

[0062] Specifically, since the diameter of the first through-hole 301 is larger, it can accommodate a connecting body 110 with a larger cross-sectional size to pass through. The diameter of the second through-hole 302 is smaller, and the cross-sectional size of the connecting body 110 it accommodates is smaller. In this embodiment, the connecting body 110 with a larger cross-sectional size placed at the central part has a higher support strength, which can further improve the overall morphological stability of the elastic connection structure in the natural state, keep a straight state under normal conditions, and avoid fatigue damage caused by free bending deformation; at the same time, the cross-sectional size of the connecting body 110 in the surrounding second through-holes 302 is smaller, and the support strength is low, so it is easier to adapt to the change in the extension direction of the medullary cavity and turn and deform during the process of medullary cavity reaming.

[0063] During the process of reaming the medullary cavity, when the connecting structure 10 gradually enters the interior of the medullary cavity, it is subjected to a relatively large resistance from the internal tissues of the medullary cavity, thereby pushing the fixing component 300 to slide along the length direction of the connecting component 100. Therefore, in some embodiments, the fixing component 300 and the corresponding connecting body 110 are in interference fit. With this arrangement, the fixing component 300 and the connecting body 110 are tightly connected, improving the relative position stability between the fixing component 300 and the connecting component 100, and can prevent the fixing component 300 from freely sliding along the extending direction of the connecting component 100 when the connecting structure 10 gradually enters the interior of the medullary cavity, and this arrangement does not affect the normal reaming and insertion of the connecting component 100.

[0064] Reference Figure 5 , in some embodiments, a plurality of fixing holes 210 are provided on the connecting head 200, and the end portions of the respective connecting bodies 110 are respectively positioned and embedded in the respective fixing holes 210 to be fixed to the connecting head 200. In this embodiment, the respective connecting bodies 110 can be integrally fixed to the connecting head 200 through the embedded installation method, and the fixing method is simple, firm and stable.

[0065] The present invention also discloses a drilling tool, including an operating handle 20, a drilling component 30 and a connecting structure 10. The connecting heads 200 at both ends of the connecting structure 10 are respectively connected to the operating handle 20 and the drilling component 30. After assembly, hold the operating handle 20 by hand, and insert the drilling component 30 into the medullary cavity to start drilling in the medullary cavity.

[0066] Reference Figure 4 , in some embodiments, the operating handle 20 and the drilling component 30 are respectively movably connected to the corresponding connecting heads 200. The movable connection method greatly facilitates the fitting installation and disassembly of the connecting structure 10 with the operating handle 20 and the drilling component 30 respectively, improving the assembly efficiency; when it is necessary to replace the operating handle 20, the drilling component 30 or the connecting structure 10 of different models, directly disassemble and replace each component, significantly saving costs.

[0067] In some embodiments, the operating handle 20 and the drilling component 30 are respectively in plug-in fit with the corresponding connecting heads 200 and are connected by a connecting pin 11.

[0068] During specific operation, reference Figure 5, taking the connection between the operating handle 20 and the connector 200 as an example, insert the connector 200 into the end of the operating handle 20, and operate the connecting pin 11 to pass through the operating handle 20 and the connector 200 in sequence, then the firm connection between the operating handle 20 and the connector 200 can be realized; pulling out the connecting pin 11 can realize the quick disassembly of the operating handle 20 and the connector 200. Similarly, the drilling component 30 and the connector 200 can also be quickly assembled and connected through the connecting pin 11. It is easy to understand that the operating handle 20 and the drilling component 30 can also be movably connected to the connector 200 by means of clamping, threaded connection, etc.

[0069] In the above description, although expressions such as "first" and "second" may be used to describe the various elements of the present invention, they are not intended to limit the corresponding elements. For example, the above expressions are not intended to limit the order or importance of the corresponding elements. The above expressions are used to distinguish one component from another.

[0070] The terms used in the description of the present invention in this article are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular expressions include plural expressions, unless there are significant differences in context and scheme.

[0071] The above description is only an exemplary embodiment of the present invention, and is not used to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

[0072] Those skilled in the art can understand that the technical features of the above-described embodiments can be omitted, added, or combined in any way accordingly. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as the combinations of these technical features do not conflict, and the simple transformation methods that those skilled in the art can think of and the solutions for adapting and functionally transforming the prior art should be considered to be within the scope described in this specification.

[0073] The above-described embodiments only represent several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that although the present invention has been shown and described with reference to various embodiments, for those of ordinary skill in the art, without departing from the concept of the present invention, several forms and various modifications and improvements in details can still be made, without departing from the scope of the present invention defined by the appended claims. These all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A connection structure, characterized in that, comprising: a connection component, including two or more connection bodies arranged side by side, each of the connection bodies extending linearly, the connection bodies being configured to bend laterally when subjected to a bending moment, and the connection bodies being configured to twist when subjected to a torsional moment; connection heads, connected to the ends of the connection bodies on the same side, for integrating and fixing the ends of the connection bodies; the connection structure further includes a fixing component, the fixing component being circumferentially sleeved on the connection component, for restricting the lateral movement of the connection bodies, thereby restricting the connection bodies from moving away from each other and causing overall deformation and damage of the connection structure; two or more channels are formed on the fixing component, each channel being for one or two or more of the connection bodies to pass through; the channel includes a first through hole and a plurality of second through holes distributed around the first through hole, each of the second through holes jointly forming a plurality of annular through hole groups centered on the first through hole and gradually away from the first through hole, the diameter of the first through hole being greater than the diameter of the second through hole; the number of the channels is more than the number of the connection bodies, and an appropriate channel can be selected according to requirements for the connection bodies to pass through; the channels are evenly distributed or densely distributed in the middle and sparsely distributed around in the radial cross-section of the fixing component.

2. The connection structure according to claim 1, characterized in that, the fixing component includes at least two fixing bodies, and each of the fixing bodies is circumferentially sleeved on the connection component at intervals along the extending direction of the connection bodies.

3. The connection structure according to claim 1, characterized in that, the number of the channels is more than the number of the connection bodies.

4. The connection structure according to claim 1, characterized in that, the fixing component and the connection component are in interference fit.

5. The connection structure according to claim 1, characterized in that, a plurality of fixing holes are formed on the connection head, and the end parts of the connection bodies are respectively positioned and embedded in the fixing holes to be fixed to the connection head.

6. The connection structure according to claim 1, characterized in that, the connection body is a filament with flexibility and elasticity.

7. The connection structure according to claim 1, characterized in that, the fixing component is a flexible sleeve integrally covering the connection component.

8. A drilling tool, characterized in that, comprising an operating handle, a drilling component and the connection structure according to any one of claims 1-7, and the connection heads at both ends of the connection structure are respectively connected to the operating handle and the drilling component.

9. The drilling tool according to claim 8, characterized in that, the operating handle and the drilling component are respectively movably connected to the corresponding connection heads.

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