Kit for taking out and separating femoral stem prosthesis in revision after hip replacement and using method
By designing separation kits and usage methods that adapt to the characteristics of femoral stem prosthesis, the problem of difficulty in removing femoral stem prosthesis after hip replacement is solved, effective separation and removal is achieved, the difficulty of surgery and the risk of tool damage is reduced, and the operation is improved Success rate and security.
Patent Information
- Application Number
- CN202411632032.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-01-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
After hip arthroplasty, it is difficult to remove the femoral stem prosthesis, resulting in difficulty in femoral cleavage and reinstallation. The existing tools lack special design and cannot effectively separate the connection between the prosthesis and the femur.
A set of femoral stem prosthesis removal and separation kit after hip replacement surgery was designed, including shell mechanism, bone knife No. Ⅰ, bone knife No. Ⅱ, bone knife No. Ⅲ, bone knife No. Ⅳ, bone knife No. Ⅳ and slip-beat removal system. It uses aluminum alloy and stainless steel materials to adapt to the shape and operating space of the femoral stem prosthesis, and is separated and removed through a collaborative work of a variety of tools and systems.
Effectively separate and remove femoral stem prosthesis, reduce the difficulty of surgery, ensure that the tool is durable and not easily damaged, suitable for prosthesis of different shapes and sizes, moderate length and thickness, and hardness is suitable for separation of cancellous bone and prosthesis coating, improving the surgical Success rate and security.
Smart Images
Figure CN119279874A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of revision surgery for hip replacement, and in particular to a femoral stem prosthesis removal and separation kit and a use method for revision surgery for hip replacement. Background Art
[0002] Hip replacement surgery is now relatively popular. As the number of surgeries increases, the number of postoperative complications also increases, and the number of surgeries that require revision surgery also increases. In the past, the instruments provided by surgical instrument companies for removing femoral stem prostheses lacked special tools, which made it difficult to remove the prosthesis stem and split the femur during surgery, making it difficult to install the reinstalled femoral prosthesis stem properly.
[0003] It is necessary to have a set of femoral prosthesis removal instruments that are easy to use, durable and practical. Special tools are made according to the characteristics of the combination between the femoral prosthesis and the femur. The characteristics of the tool are adapted to the characteristics of the combination between the femoral prosthesis and the femur. Thick separation tools cannot be inserted between the prosthesis and the femur. If the thickness is too thick, the femur will crack or separate into several pieces of broken bones when inserted, which will increase the difficulty of subsequent operations. The thickness of the tool is a very important factor; according to the special shape of the prosthesis, designing tools of corresponding shapes is also a factor to be considered; the operating space problem in hip replacement surgery should be considered, and the length of the tool should also be appropriately considered, so that the operation can be completed smoothly and the operation can be smooth and easy to operate; in terms of the hardness of the tool, it must be able to have the hardness to separate the bone growth between the cancellous bone and the prosthesis coating, and the tool cannot be easily damaged during operation, the tool cannot be broken due to too high hardness, and the tool edge cannot be curled or bent due to insufficient hardness.
[0004] Therefore, there is a need for a femoral stem prosthesis removal and separation kit and a method of use for revision hip replacement surgery. The surgical instrument includes five relatively independent units, which can separate the connection between the prosthesis stem and the femur when the femoral stem prosthesis is removed during revision hip replacement surgery. Summary of the invention
[0005] In view of the above technical problems, the present invention provides a femoral stem prosthesis removal and separation kit for revision hip replacement, which is used to separate the connection between the prosthesis stem and the femur when the femoral stem prosthesis is removed during revision hip replacement. Currently, hip replacement is relatively popular. With the increase in the number of surgeries, the number of postoperative complications has also increased, and the number of surgeries requiring revision has also increased. In the past, some instruments for removing femoral stem prostheses had the problem of lack of special tools, which made it difficult to remove the prosthesis stem and split the femur during the operation, making it impossible to install the reinstalled femoral prosthesis stem well. It is very necessary to have a set of femoral prosthesis removal instruments that are easy to use, durable and practical. Corresponding special tools are made according to the characteristics of the connection between the femoral prosthesis and the femur.
[0006] The technical solution used in the present invention is: a femoral stem prosthesis removal and separation kit for revision hip replacement, comprising a shell mechanism for placing the separation kit, the shell mechanism being used for storing the kit;
[0007] The housing mechanism comprises: a housing, a housing cover and buckles; the housing is placed at a desired position, and grooves are provided on both sides of the housing; L-shaped plates on both sides of the housing cover are slidably installed in the grooves on the housing; there are five groups of buckles, and the five groups of buckles are fixedly installed in the housing respectively;
[0008] The separation kit comprises a No. I bone knife, a No. II bone fork, a No. III special-shaped bone knife, a No. IV special-shaped bone knife and a sliding hammer removal system; the No. I bone knife is slidably mounted in the first buckle; the No. II bone fork is movably mounted in the second buckle; the No. III special-shaped bone knife is movably mounted in the third buckle; the No. IV special-shaped bone knife is slidably mounted in the fourth buckle; and the sliding hammer removal system is movably mounted in the fifth buckle.
[0009] Preferably, the housing is provided with a plurality of through holes.
[0010] Preferably, a handle is provided on the side of the shell.
[0011] Preferably, the housing is made of aluminum alloy.
[0012] Preferably, the shell cover is provided with a plurality of through holes.
[0013] Preferably, the shell cover is made of aluminum alloy.
[0014] Preferably, the sliding hammer removal system comprises: a sliding rod, a sliding hammer and a hook end; the hook end has a screw buckle end connected to the sliding rod, the screw buckle end is connected to the hook end, and the other end is fixed by a fixing bolt to prevent the sliding hammer from falling off;
[0015] Preferably, the No. Ⅰ bone knife, No. Ⅱ bone knife, No. Ⅲ special-shaped bone knife, No. Ⅳ special-shaped bone knife and sliding hammer removal system are all made of 420, 430 stainless steel and 17-4PH stainless steel.
[0016] The present invention also provides a method for using a femoral stem prosthesis removal and separation kit for revision hip replacement, comprising the following steps:
[0017] S1. When the prosthesis stem at the femoral end is exposed by cutting the separated tissue and needs to be removed, if the prosthesis stem is not loose and cannot be easily removed, first use a No. Ⅰ bone knife to drive the prosthesis stem and femur into the separation, and then carefully tap the prosthesis edge in turn to separate it;
[0018] S2. Some bones are fully grown or bonded with bone cement and cannot be separated well. You can use the No. Ⅰ bone knife to drive into the channel and then use the No. Ⅱ bone scissors to drive in. Use the serrated side to separate the connection and knock repeatedly to separate. If the joint is tightly fitted and cannot be pulled out by hand after knocking in, you can use the sliding hammer removal system to remove it.
[0019] S3. If the above operations still cannot successfully remove the prosthesis stem, a No. Ⅲ special-shaped bone knife can be inserted into the front and back sides of the femoral prosthesis stem to separate it. If the bone knife cannot be pulled out by hand after being inserted, the sliding hammer removal system can be used to remove it;
[0020] S4. A No. Ⅳ special-shaped bone knife can be used to drive into the inner and outer sides of the femoral prosthesis stem for separation. If the bone knife cannot be pulled out by hand after being driven in, it can be removed using a sliding hammer removal system.
[0021] The beneficial effects of the present invention compared with the prior art are:
[0022] 1. The present invention is adapted to the characteristics of the femoral prosthesis being combined with the femur. A thicker separation tool cannot be driven between the prosthesis and the femur. If the tool is too thick, the femur may be cracked or separated into several pieces of broken bones, which greatly increases the difficulty of subsequent surgery. Therefore, it is very important to set the thickness of the tool at 1 or 2 mm.
[0023] 2. The present invention is based on the special shape of the prosthesis. The design of the corresponding tools must take into account the operating space problem in hip replacement surgery. The length of the tools must also be appropriately considered to successfully complete the surgery. Therefore, the total length of this set of instruments is set to 250mm.
[0024] 3. The hardness of the tool of the present invention must be strong enough to separate the cancellous bone and the prosthetic coating to allow bone ingrowth, but the hardness should not be too high so as to cause the tool to break. If the hardness is not enough, the cutting edge of the tool may curl or bend. Therefore, 420, 430 stainless steel, or 17-4PH stainless steel is used for the tool.
[0025] 4. The kit designs special-shaped instruments according to the shape and size of the prosthesis. The shape and size specifications of the special-shaped instruments are designed according to the function. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1It is a schematic diagram of the housing structure of the present invention.
[0027] Figure 2 It is a schematic diagram of the internal structure of the shell mechanism of the present invention.
[0028] Figure 3 It is a schematic structural diagram of the No. Ⅰ bone knife of the present invention.
[0029] Figure 4 It is a schematic diagram of the structure of bone No. II of the present invention.
[0030] Figure 5 It is a schematic structural diagram of the No. III special-shaped bone knife of the present invention.
[0031] Figure 6 It is a schematic structural diagram of the No. Ⅳ special-shaped bone knife of the present invention.
[0032] Figure 7 It is a schematic diagram of the structure of the sliding hammer removal system of the present invention.
[0033] Figure 8 It is a schematic diagram of the separation structure of the sliding hammer removal system of the present invention.
[0034] Figure 1: Shell mechanism; 5: Bone knife No. I; 6: Bone knife No. II; 7: Special-shaped bone knife No. III; 8: Special-shaped bone knife No. IV; 9: Slide hammer removal system; 101: Shell; 102: Shell cover; 103: Buckle; 901: Slide rod; 902: Slide hammer; 903: Hook end. DETAILED DESCRIPTION
[0035] The technical solution of the present invention is further specifically described below by way of embodiments and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.
[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect" and "drive" should be understood in a broad sense. For example, it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, they can understand the specific meanings of the above terms in the present invention.
[0037] Examples, such as Figure 1-Figure 8 As shown, a femoral stem prosthesis removal and separation kit for revision hip replacement and a method of use thereof include a housing mechanism 1 for placing the separation kit, and the housing mechanism 1 is used for storing the kit;
[0038] like Figure 1 , Figure 2As shown, the housing mechanism 1 includes: a housing 101, a housing cover 102 and buckles 103; the housing 101 is placed at a desired position, and grooves are provided on both sides of the housing 101; L-shaped plates on both sides of the housing cover 102 are slidably installed in the grooves on the housing 101, and the housing cover 102 can open or close the housing 101; there are five groups of buckles 103, and the five groups of buckles 103 are respectively fixedly installed in the housing 101, and the five groups of buckles 103 are respectively clamped with five femoral stem prosthesis removal and separation parts;
[0039] like Figure 3-Figure 8 As shown, the separation kit includes No. I bone knife 5, No. II bone fork 6, No. III special-shaped bone knife 7, No. IV special-shaped bone knife 8 and a sliding hammer removal system 9; No. I bone knife 5 is slidably mounted in the first buckle 103; No. II bone fork 6 is movably mounted in the second buckle 103; No. III special-shaped bone knife 7 is movably mounted in the third buckle 103; No. IV special-shaped bone knife 8 is slidably mounted in the fourth buckle 103; and the sliding hammer removal system 9 is movably mounted in the fifth buckle 103.
[0040] like Figure 1 , Figure 2 As shown, the housing 101 is provided with a plurality of through holes to facilitate manual high-pressure steam sterilization of the internal separation kit.
[0041] like Figure 1 , Figure 2 As shown, a handle is provided on the side of the housing 101 to facilitate manual taking and placing.
[0042] like Figure 1 , Figure 2 As shown, the housing 101 is made of aluminum alloy, which has low density, high strength, and excellent electrical conductivity, thermal conductivity, and corrosion resistance.
[0043] like Figure 1 As shown, the shell cover 102 is provided with a plurality of through holes to facilitate manual high-pressure steam sterilization of the internal separation kit.
[0044] like Figure 1 As shown, the shell cover 102 is made of aluminum alloy, which has low density, high strength, and excellent electrical conductivity, thermal conductivity, and corrosion resistance.
[0045] like Figure 7 , Figure 8 As shown, the sliding hammer removal system 9 includes: a sliding rod 901, a sliding hammer 902 and a hook end 903; the hook end 903 has a screw buckle end connected to the sliding rod 901, the screw buckle end is connected to the hook end 903, and the other end is fixed by a fixing bolt to prevent the sliding hammer 902 from falling off.
[0046] like Figure 3 , Figure 8As shown, No. I bone knife 5, No. II bone knife 6, No. III special-shaped bone knife 7, No. IV special-shaped bone knife 8 and sliding hammer removal system 9 are all made of 420, 430 stainless steel and 17-4PH stainless steel to ensure that the tools must have the hardness to separate the bone ingrowth between the cancellous bone and the prosthesis coating, but the hardness should not be too high to cause the tool to break, and if the hardness is not enough, the cutting edge of the tool will curl or bend.
[0047] Working principle:
[0048] According to the characteristics of the operation, a set of special separation kits and usage methods are made based on the shape characteristics of the femoral stem prosthesis, which is mainly composed of four separation components and a set of sliding hammer extractors; when the prosthesis stem at the femoral end is exposed by cutting the separation tissue and needs to be removed, if the prosthesis stem is not loose and cannot be easily removed; first use No. Ⅰ bone knife 5 to drive in and separate it between the prosthesis stem and the femur, and then carefully tap and separate it along the edge of the prosthesis in turn; some bones have sufficient ingrowth or bone cement adhesion and cannot be well separated, then No. Ⅱ bone scissors 6 can be driven in after No. Ⅰ bone knife 5 is driven into the channel, and the serrated side can be used to separate the connection, and the separation can be repeatedly tapped. If the fit is tight after tapping and it cannot be pulled out by hand, the sliding hammer can be used to remove the system System 9 can be used to remove it; if the above operation still cannot successfully remove the prosthesis stem, a No. III special-shaped bone knife 7 can be driven into the front and rear sides of the femoral prosthesis stem to separate it. When the bone knife cannot be pulled out by hand after being driven in, the sliding hammer removal system 9 can be used to remove it; a No. IV special-shaped bone knife 8 can be driven into the inside and outside sides of the femoral prosthesis stem to separate it. When the bone knife cannot be pulled out by hand after being driven in, the sliding hammer removal system 9 can be used to remove it; the femoral prosthesis stem can be successfully removed by operating in this way; after the separation kit is used, it is placed on the corresponding buckle 103 in the shell 101, and the shell cover 102 is slid so that the shell cover 102 closes the shell 101, and then the shell mechanism 1 and its internal structure are manually sterilized with high-pressure steam.
[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.
Claims
1. A femoral stem prosthesis removal and separation kit for revision hip replacement, characterized in that: It comprises a housing mechanism (1) for placing the separation kit, and the housing mechanism (1) is used for storing the kit; The housing mechanism (1) comprises: a housing (101), a housing cover (102) and buckles (103); the housing (101) is placed at a desired position, and grooves are provided on both sides of the housing (101); L-shaped plates on both sides of the housing cover (102) are slidably mounted in the grooves on the housing (101); there are five groups of buckles (103), and the five groups of buckles (103) are respectively fixedly mounted in the housing (101); The separation kit comprises a No. I bone knife (5), a No. II bone bar (6), a No. III special-shaped bone knife (7), a No. IV special-shaped bone knife (8) and a sliding hammer removal system (9); the No. I bone knife (5) is slidably mounted in the first buckle (103); the No. II bone bar (6) is movably mounted in the second buckle (103); the No. III special-shaped bone knife (7) is movably mounted in the third buckle (103); the No. IV special-shaped bone knife (8) is slidably mounted in the fourth buckle (103); and the sliding hammer removal system (9) is movably mounted in the fifth buckle (103).
2. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The housing (101) is provided with a plurality of through holes.
3. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: A handle is provided on the side of the housing (101).
4. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The housing (101) is made of aluminum alloy.
5. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The shell cover (102) is provided with a plurality of through holes.
6. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The shell cover (102) is made of aluminum alloy.
7. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The sliding hammer removal system (9) comprises: a sliding rod (901), a sliding hammer (902) and a hook end (903); the hook end (903) has a screw buckle end connected to the sliding rod (901), the screw buckle end is connected to the hook end (903), and the other end is fixed by a fixing bolt to prevent the sliding hammer (902) from falling off.
8. The femoral stem prosthesis removal and separation kit for revision hip replacement according to claim 1, characterized in that: The No. Ⅰ bone knife (5), No. Ⅱ bone knife (6), No. Ⅲ special-shaped bone knife (7), No. Ⅳ special-shaped bone knife (8) and sliding hammer removal system (9) are all made of 420, 430 stainless steel and 17-4PH stainless steel.