Composite intramedullary fixing bone end broach system for extramedullary 3D printing

Abstract

The invention provides an extramedullary 3D printing composite intramedullary fixing bone end broach system, and relates to the technical field of medical instruments. Comprising a bone prosthesis and a fixing system, and the fixing system comprises a broach which is arranged at one end of the bone prosthesis and is fixed in a medullary cavity through bone cement; the fixing piece is arranged at the end, close to the broach, of the bone prosthesis and makes contact with the host bone, and the contact face is a 3D printing interface; the preset part is used for replacing the fixing part to make contact with the host bone in the prosthesis mounting operation. According to the fixing system, the broach, the fixing part and the preset part are used in cooperation, bone cement in a medullary cavity is fixed through the broach, and 3D interface fixing is adopted through the fixing part, so that the bone prosthesis has good bone conductivity and mechanical stability in a long term and a short term; and the influence on bone ingrowth caused by the fact that bone cement falls into a 3D contact interface of the fixing piece in a prosthesis installation operation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an extra-medullary 3D printing composite intra-medullary fixed bone end marrow needle system. Background Art

[0002] A bone prosthesis is an artificial medical device used to replace or repair damaged bones or joints in the human body. When the bone prosthesis is fixed to the bone, a marrow needle system inserted into the bone marrow cavity is mostly used, and bone cement or 3D interface bone ingrowth is used for fixation.

[0003] In the prior art, the bone cement-fixed marrow needle has good initial stability, but poor long-term fixation stability; while the 3D interface prosthesis is fixed by bone ingrowth, with low initial stability and good long-term stability, but it is difficult to be applicable to primary surgery patients. Because the bone marrow cavity of primary surgery patients is narrow, which limits the strength of the 3D printed marrow needle, and the risk of intra-medullary needle breakage is high. If it breaks after ingrowth, it is very difficult to remove during revision, which brings difficulties to revision. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an extra-medullary 3D printing composite intra-medullary fixed bone end marrow needle system, which solves the problems of poor long-term stability of the bone cement-fixed marrow needle and difficulty in revision of the 3D interface-fixed marrow needle in the prior art. The bone prosthesis of the present invention has good osteoconductivity and mechanical stability both in the long term and short term.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] An extra-medullary 3D printing composite intra-medullary fixed bone end marrow needle system proposed by the present invention includes a bone prosthesis and a fixation system. The fixation system includes:

[0007] A marrow needle, which is arranged at one end of the bone prosthesis and is fixed in the bone marrow cavity through bone cement;

[0008] A fixing member, which is arranged at one end of the bone prosthesis close to the marrow needle and contacts the host bone,

[0009] The contact surface is a 3D printing interface; a prefabricated member, which is used to contact the host bone instead of the fixing member during the prosthesis installation operation.

[0010] In one embodiment, the fixing member is a plurality of combined sheet-like structures, and the fixing member is sleeved on the outer surface of the marrow needle.

[0011] In a preferred embodiment: a wing plate is arranged at the top of the fixing member, and the contact surface of the wing plate contacting the host bone is a 3D printing interface.

[0012] In a preferred embodiment: an insertion pile is arranged at the bottom of the fixing member, and a slot adapted to the insertion pile is opened at the top of the bone prosthesis.

[0013] In a further preferred embodiment: the cross-sectional shape of the insertion pile is "T" shaped.

[0014] In one embodiment, the fixing members are fixedly engaged with each other through a snap mechanism.

[0015] In a preferred embodiment: one end of some fixing members in contact with the host bone is provided with a gap, and the thickness of the gap is the same as the depth of the card slot of the snap mechanism.

[0016] In a more preferred embodiment: the length of the insertion pile is the same as the depth of the card slot of the snap mechanism and the thickness of the gap.

[0017] In one embodiment: each fixing member is provided with a locking hole that penetrates through each other, and the locking hole is used to set a locking pile for fixation.

[0018] In one embodiment: one end of the bone prosthesis away from the medullary needle is provided with a joint.

[0019] The present invention provides an extra-medullary 3D printing composite intramedullary fixation bone end medullary needle system. Compared with the prior art, it has the following beneficial effects:

[0020] Through the cooperation of the fixation system, including the medullary needle, the fixing member, and the prefabricated member, bone cement fixation in the medullary cavity is performed through the medullary needle, and 3D interface fixation is adopted through the fixing member. The bone prosthesis has good osteoconductivity and mechanical stability both in the long term and the short term, and avoids the influence on bone ingrowth caused by bone cement falling into the 3D contact interface of the fixing member during the prosthesis installation surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a three-dimensional schematic diagram of an extra-medullary 3D printing composite intramedullary fixation bone end medullary needle system provided by the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the fixing member in the embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the detailed structure of the bottom of the fixing member and the top of the bone prosthesis in the embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of the meshing effect of the fixing members in the embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the combined effect of the prefabricated parts in the embodiments of the present invention.

[0027] Figure 6 Schematic diagram of the structure of one end joint of the bone prosthesis in the embodiments of the present invention.

[0028] In the figure: 1, bone prosthesis; 2, fixation system;

[0029] 11, joint; 21, intramedullary needle; 22, fixing piece; 23, prefabricated part;

[0030] 111, slotted groove; 221, wing plate; 222, insertion pile; 223, buckle mechanism; 224, gap. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The embodiments of the present invention provide an extra-medullary 3D printing composite intramedullary fixation bone end intramedullary needle system, which includes a bone prosthesis and a fixation system. The fixation system includes: an intramedullary needle disposed at one end of the bone prosthesis and fixed in the medullary cavity by bone cement; a fixing piece disposed at one end of the bone prosthesis close to the intramedullary needle and in contact with the host bone, and the contact surface is a 3D printing interface; a prefabricated part used to contact the host bone instead of the fixing piece during the prosthesis installation operation, solving the problems of poor long-term stability of the bone cement-fixed intramedullary needle and difficulty in revision of the 3D interface-fixed intramedullary needle in the prior art. The bone prosthesis of the present invention has good osteoconductivity and mechanical stability both in the long term and the short term.

[0033] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0034] Embodiment 1:

[0035] Referring to Figure 1 As shown, an extra-medullary 3D printing composite intramedullary fixation bone end intramedullary needle system proposed by the present invention includes a bone prosthesis 1 and a fixation system 2. The fixation system 2 includes: an intramedullary needle 21 disposed at one end of the bone prosthesis 1 and fixed in the medullary cavity by bone cement; a fixing piece 22 disposed at one end of the bone prosthesis 1 close to the intramedullary needle and in contact with the host bone, and the contact surface is a 3D printing interface; a prefabricated part 23 used to contact the host bone instead of the fixing piece 22 during the prosthesis installation operation.

[0036] It should be noted that: the shape and size of the bone prosthesis 1 are customized according to the actual needs of the patient; the prefabricated part 23 is arranged on the outer surface of the intramedullary needle 21, and its size and length are the same as those of the fixing part 22. During the prosthesis installation surgery, first, the intramedullary needle 21 is fixed in the medullary cavity with bone cement. The prefabricated part 23 is arranged on the outer surface of the part of the intramedullary needle 21 extending out of the medullary cavity. After the bone cement solidifies, the prefabricated part 23 is removed, and the fixing part 22 is arranged on the part of the intramedullary needle 21 extending out of the medullary cavity and the bone prosthesis 1. Bone grafting is performed on the defective part of the contact surface between the fixing part 22 and the host bone; the intramedullary needle 21 is fixed with bone cement, with fast fixing speed and good initial stability. Moreover, during subsequent revision, it is easy to be pulled out of the medullary cavity for removal; the 3D interface of the fixing part 22 is fixed by bone ingrowth later, with good long-term stability. During revision, it is exposed outside the bone and is easy to be removed for revision; the prefabricated part 23 can prevent bone cement from leaking out from the gap between the intramedullary needle 21 and the medullary cavity, resulting in bone cement entering the 3D interface of the fixing part 22, thereby affecting the bone ingrowth effect.

[0037] Embodiment 2:

[0038] See Figure 2 As shown, a kind of extra-medullary 3D printing composite intramedullary fixation bone end intramedullary needle system proposed by the present invention includes the content involved in Embodiment 1. In addition: the fixing part 22 is a plurality of mutually combined sheet-like structures, and the fixing part 22 is sleeved on the outer surface of the intramedullary needle 21.

[0039] It should be noted that: the fixing part 22 is a plurality of sheet-like combined structures, and the thickness and length of each fixing part can be prefabricated and adjusted according to the situation of the host bone. The plurality of sheet-like combined structures are conducive to quick and convenient installation during the operation.

[0040] See Figure 2 As shown, in a preferred embodiment: a wing plate 221 is fixedly installed at the top of the fixing part 22, and one side surface of the wing plate 221 contacts the host bone, and the contact surface is a 3D printing interface.

[0041] It should be noted that: the wing plate 221 can provide an auxiliary bone ingrowth surface for the host bone, thereby realizing the integration after the prosthesis surface of the proximal bone contact grows in, that is, the mechanical conduction from the prosthesis to the bone, reaching the interface for long-term survival. The length of each wing plate 221 is prefabricated and adjusted according to the curvature of the host bone to achieve better mechanical effects.

[0042] See Figure 3 As shown, in a preferred embodiment: an insertion pile 222 is provided at the bottom of the fixing part 22, and a slot 111 adapted to the insertion pile 222 is opened at the top of the bone prosthesis 1.

[0043] It should be noted that: the fixing part 22 and the bone prosthesis 1 are fixed by the insertion pile 222, which improves the convenience of the prosthesis installation surgery.

[0044] See Figure 3 As shown, in a further preferred embodiment: the cross-sectional shape of the insertion pile 222 is "T" shaped.

[0045] It should be noted that: the "T" shaped structure of the insertion pile 222 can effectively resist the rotational action of the human muscles and bones on the fixing member 22, and prevent the fixing member 22 from rotating relative to the bone prosthesis 1.

[0046] Embodiment 3:

[0047] See Figure 4 As shown, an extra-medullary 3D printed composite intramedullary fixation bone end nail system proposed by the present invention includes the content involved in Embodiment 2 and the preferred embodiments of Embodiment 2. In addition, the fixing members 22 are fixedly engaged with each other through a snap mechanism 223.

[0048] It should be noted that: the snap mechanism 223 can quickly fix the fixing members 22 to each other, improving the convenience of the prosthesis installation surgery.

[0049] See Figure 4 As shown, in a preferred embodiment: one end of some fixing members 22 in contact with the host bone is provided with a gap 224, and the thickness of the gap 224 is the same as the depth of the card slot of the snap mechanism 223.

[0050] It should be noted that: the gap 224 and the setting of its thickness being the same as the depth of the card slot of the snap mechanism 223 are conducive to the combined installation of the fixing members 22. When the contact surface of the fixing member 22 touches the host bone, the snap mechanisms 223 can just touch each other. After the snap mechanisms 223 are engaged, a gap 224 is formed, and the gap 224 fills the missing part of the bone contact surface by bone grafting.

[0051] In a more preferred embodiment: the length of the insertion pile 222 is the same as the depth of the card slot of the snap mechanism 223 and the thickness of the gap 224.

[0052] It should be noted that: through the setting that the length of the insertion pile 222 is the same as the depth of the card slot of the snap mechanism 223 and the thickness of the gap 224, when the contact surface of the fixing member 22 provided with the gap 224 touches the host bone, the length from the end of the insertion pile 222 to the bone contact surface end of the fixing member 22 is exactly the same as the length of the fixing member without the gap 224, which is also the distance from the host bone contact surface end to the bone prosthesis 21, and can improve the convenience of the prosthesis installation surgery.

[0053] Embodiment 4:

[0054] See Figure 4As shown in the figure, a 3D printed composite intramedullary fixation bone end intramedullary needle system proposed by the present invention includes the content involved in the above-mentioned embodiments and preferred embodiments. In addition, each fixing member 22 is provided with a locking hole that penetrates through each other, and the locking hole is used to set a locking pile for fixation.

[0055] It should be noted that: the locking pile can be a fixing rod commonly used in bone surgeries such as rivets, screws, bolts, etc. Through the setting of the locking hole and the locking pile, the fixing member 22 can be firmly fixed to the bone prosthesis 1 and the intramedullary needle 21, providing good conditions for bone ingrowth on the subsequent contact surface.

[0056] See Figure 5 As shown in the figure, in a preferred embodiment: the prefabricated member 23 is a plurality of sheet-like structures combined with each other, and each prefabricated member 23 is provided with a locking hole that penetrates through each other, and the locking hole is used to set a locking pile for fixation.

[0057] It should be noted that: the locking pile can be a fixing rod commonly used in bone surgeries such as rivets, screws, bolts, etc. Through the setting of the locking hole and the locking pile, during the operation, the prefabricated member 23 can be first fixed at the position where the outer surface of the intramedullary needle 21 contacts the host bone. When the intramedullary needle 21 is fixed by bone cement, it can prevent the bone cement in the host bone marrow cavity from overflowing or falling onto the 3D interface of the fixing member 22 after solidification. After the bone cement fixation is completed and the possible bone cement on the host bone contact surface is removed, the medical staff can conveniently remove the prefabricated member through the locking pile, improving the working efficiency of the operation.

[0058] Embodiment 5:

[0059] See Figure 6 As shown in the figure, a 3D printed composite intramedullary fixation bone end intramedullary needle system proposed by the present invention includes the content involved in the above-mentioned embodiments and preferred embodiments. In addition, one end of the bone prosthesis 1 away from the intramedullary needle 21 is provided with a joint 11.

[0060] It should be noted that: one end of the joint 11 is connected to other joint prostheses (such as hip joint prostheses, knee joint prostheses, etc.), and is combined and connected by a tapered press fit method, which is common in modular prosthesis structures and will not be elaborated here. Through the setting of the joint 11, the bone prosthesis 1 can be installed by replacing joint prostheses in different parts according to needs, improving the compatibility of the present invention.

[0061] To sum up, compared with the prior art, the following beneficial effects are achieved:

[0062] 1. Through the fixation system, including the combined use of the intramedullary needle and the fixing member, bone cement fixation is carried out in the medullary cavity through the intramedullary needle, and 3D interface fixation is adopted through the fixing member. The bone prosthesis has good osteoconductivity and mechanical stability both in the long term and in the short term.

[0063] 2. By setting the prefabricated parts in the fixation system, the influence on bone ingrowth caused by bone cement falling into the 3D contact interface of the fixation parts during the prosthesis installation surgery is avoided.

[0064] 3. By setting the wing plate, the integration of the prosthesis surface for proximal bone contact after bone ingrowth is achieved, that is, the mechanical conduction from the prosthesis to the bone, to reach an interface for long-term survival.

[0065] 4. By setting multiple groups of fixation parts, buckle mechanisms, gaps, insertion piles, locking holes, locking piles, and multiple groups of prefabricated parts, the fixation parts can resist the rotational effects of human muscles and bones; the convenience of the prosthesis installation surgery is improved.

[0066] 5. By setting the joint at one end of the bone prosthesis, it can be compatible with and replace various common prosthesis joints, improving the compatibility of the present invention.

[0067] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extra-medullary 3D printed composite intramedullary fixed bone end medullary needle system, characterized in that, Comprising a bone prosthesis (1) and a fixation system (2), the fixation system (2) includes: A marrow pin (21), which is arranged at one end of the bone prosthesis (1) and is fixed in the marrow cavity by bone cement; A fixing member (22), which is arranged at one end of the bone prosthesis (1) close to the marrow pin and contacts the host bone, and the contact surface is a 3D printing interface; A pre-set member (23), which is used to contact the host bone instead of the fixing member (22) during the prosthesis installation surgery.

2. The extra-medullary 3D printing composite intramedullary fixation bone end medullary needle system according to claim 1, wherein, The fixing member (22) is a plurality of combined sheet-like structures, and the fixing member (22) is sleeved on the outer surface of the marrow pin (21).

3. The extra-medullary 3D printing composite intramedullary fixation bone end marrow needle system according to claim 2, wherein A wing plate (221) is arranged at the top of the fixing member (22), and the contact surface of the wing plate (221) contacting the host bone is a 3D printing interface.

4. The extramedullary 3D printing composite intramedullary fixed bone end marrow needle system according to claim 2, wherein An insertion pile (222) is arranged at the bottom of the fixing member (22), and a slot (111) adapted to the insertion pile (222) is opened at the top of the bone prosthesis (1).

5. The extra-medullary 3D printing composite intramedullary fixed bone end medullary needle system according to claim 4, characterized in that, The cross-sectional shape of the insertion pile (222) is a "T" shape.

6. A kind of extramedullary 3D printing composite intramedullary fixed bone end intramedullary needle system according to any one of claim 2, characterized in that, The fixing members (22) are mutually engaged and fixed through a buckle mechanism (223).

7. The extramedullary 3D printing composite intramedullary fixed bone end marrow needle system according to claim 6, characterized in that, A gap (224) is arranged at one end of some of the fixing members (22) contacting the host bone, and the thickness of the gap (224) is consistent with the depth of the card slot of the buckle mechanism (223).

8. The extramedullary 3D printed composite intramedullary fixed bone end marrow needle system according to claim 6, characterized in that, The length of the insertion pile (222) is consistent with the depth of the card slot of the buckle mechanism (223) and the thickness of the gap (224).

9. The extra-medullary 3D printing composite intramedullary fixed bone end marrow needle system according to claim 2, wherein Locking holes communicating with each other are opened in each of the fixing members (22), and the locking holes are used for arranging locking piles for fixation.

10. A 3D printed composite intramedullary fixation bone end medullary needle system for extramedullary use according to any one of claims 1-9, characterized in that, A joint (11) is arranged at one end of the bone prosthesis (1) far from the marrow pin (21).

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