GB2400324A - Improvements in and relating to trocars - Google Patents
Improvements in and relating to trocars Download PDFInfo
- Publication number
- GB2400324A GB2400324A GB0308560A GB0308560A GB2400324A GB 2400324 A GB2400324 A GB 2400324A GB 0308560 A GB0308560 A GB 0308560A GB 0308560 A GB0308560 A GB 0308560A GB 2400324 A GB2400324 A GB 2400324A
- Authority
- GB
- United Kingdom
- Prior art keywords
- trocar
- operational
- point
- metallic
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004033 plastic Substances 0.000 claims abstract description 23
- 229920003023 plastic Polymers 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000001356 surgical procedure Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- 229910000811 surgical stainless steel Inorganic materials 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003387 muscular Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/0023—Surgical instruments, devices or methods, e.g. tourniquets disposable
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
A trocar comprising a generally elongate plastics relatively large body with a small surgical steel operational point which forms the operational initial insertion means to enable easy penetration into a body.
Description
Improvements in or relating to trocars The present invention relates to
trocars and more particularly to disposable trocars for use in surgical operations.
Trocars are used in combination with catheters to enable surgical instruments to be passed into the body for endoscopic examination on operations to be performed.
lo Increasingly instruments used in surgical operations are required to be disposable in order that infection is not transferred. Many organisms are not destroyed by sterilization techniques and thus the safest way is to use instruments only once.
Is To achieve this at a reasonable cost many instruments are now made from disposable plastics material and this can be acceptable for many such instruments such as tweezers, clamps, etc. To achieve this for trocars these have been made from a hard plastics to material and these have been reasonably successful.
However despite manufacturing the trocar from a hard plastics material with a relatively sharp pointed end it has been found in practice that substantial force is often necessary to insert the trocar into a body through the skin, fat as and/or muscular layer.
This can be distressful for the patient since though local anaesthetic may be used the patient can still feel the substantial force often required to insert the trocar.
The trocar according to the present invention seeks to obviate the above disadvantages by providing a disposable trocar at a reasonable cost but which provides an easily useable patient friendly cutting action.
The present invention provides a trocar for surgical procedures said trocar comprising an elongate cylindrical shaft of plastics material and including an operational metallic point.
Preferably said operational metallic point is integrally moulded into said lo elongate plastics shaft.
Preferably said plastics shaft comprises an elongate substantially cylindrical shaft with a handle portion at one end, said elongate shape being tapered at the other end of the shaft and in which said metallic point is shaped to integrate with said tapered portion of said shaft to smoothly continue said taper to form a sharp point for said trocar.
Preferably said operational metallic point is provided with anchor means which securely anchors said operational metallic point into said elongate cylindrical shaft.
In a preferred embodiment said operational metallic point represents less than 1% of the volume of the trocar the remaining 99% comprising the plastics material.
The invention also provides a method of producing a trocar comprising the steps of inserting an operational metallic point with a plastics moulding machine, injecting plastics material into said moulding machine to form a trocar by integrally moulding said plastics material with said operational so metallic point.
Preferably said plastics material is polycarbonate and said operational metallic point is surgical quality stainless steel.
The invention also provides a trocar and cannula set including a trocar as above.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a trocar according to the present invention in partial longitudinal cross section, Figure 2 shows the trocar of Figure 1 in cross section on line A-A of Figure Figure 3 shows a further view of the trocar of Figure 1 in partial cross section, Figure 4 shows in detail the operational metallic point of the trocar of Figure 1, Figure 5 shows in longitudinal part cross section side view of a removable so catheter from the trocar of Figures 1 to 4, Figure 6 shows the cannula of Figure 5, Figure 6 shows the catheter of Figure 5 in cross sectional plan view, and Figure 7 shows the cannula of Figure 6 in cross section on line C-C.
With reference mow to Figures 1 to 4 the trocar 10 comprises a generally elongate cylindrical body 12 with a handle section 14 and a shoulder portion 16. The shoulder 16 has a slot 18 which co-operates with a tear off strip 52 of the cannula 50 (see Figure 5).
The elongate cylindrical body section 12 is provided with a groove 20 shown in end elevation in Figure 2.
The operational metallic point 22 shown in detail in Figure 4 comprises a s sharp point section 222 a recessed anchor section 224 and a stub section 226 which acts to stabilise and locate the point within the cylindrical body section 12.
The angle of the point is designed to be the same angle as the end section lo 122 of the body section 12. The anchor section 224 and stub section 226 ensure that the point is securely located in the cylindrical body 12 to resist the pressure during insertion and to ensure that the point can not be detached from the trocar 10.
As can be seen from the drawings which are substantially correctly scaled, the operational metallic point 2 is in a volume ratio to the plastics portion of the trocar has less that 1% (check with Andrew).
Thus a high grade surgical steel point which can be extremely sharp can be to used as it forms such a small portion of the trocar.
The point is preferably moulded into the plastics portion of the trocar by placing the point accurately into a mould and then injecting the plastics material which is for example a polycarbonate material providing good :5 strength for the trocar.
To complete the trocar assembly a removable cannula 50, Figures 5 to 7, is placed around the cylindrical portion 12 of trocar 10.
The cannula 50 has a forward end portion 52 with a slope which comprises the angle of the metallic point and end section of the trocar to form a smooth surface to assist insertion.
Cannula 50 is also provided with a tab 54 attached to a tear off strip 56 which enable the cannula to be removed from the body after initial use. The tear off strip is made removable by grooves 58 shown in Figure 7.
The portion 542 of tab 54 is dimensional to pass through the slot portion 18 lo of shoulder 16.
The present invention thus provides a disposable trocar which is easy to use but is relatively inexpensive thus substantially reducing operating costs.
Claims (8)
- Claims 1. A trocar for surgical procedures said trocar comprising anelongate cylindrical shaft of plastics material and including an operational metallic point.
- 2. A trocar as claimed in Claim 1, in which said operational metallic point is integrally mould into said elongate plastics shaft.lo
- 3. A trocar as claimed in Claim 2, in which said plastics shaft comprises an elongate substantially cylindrical shaft with a handle portion at one end, said elongate shape being tapered at the other end of the shaft and in which said metallic point is shaped to integrate with said tapered portion of said shaft to smoothly continue said taper to form a sharp point for said trocar.
- 4. A trocar as claimed in any one of Claims 1 to 3, in which said operational metallic point is provided with anchor means which securely anchors said operational metallic point into said elongate cylindrical shaft.
- 5. A trocar as claimed in any one of Claims 1 to 4, in which said operational metallic point represents less than 1% of the volume of the trocar the remaining 99% comprising the plastics material.
- 6. A method of producing a trocar comprising the steps of inserting an operational metallic point with a plastics moulding machine, injecting plastics material into said moulding machine to form a trocar by integrally moulding said plastics material with said operational metallic so point.
- 7. A method of producing a trocar as claimed in Claim 6, in which said plastics material is polycarbonate and said operational metallic point is surgical quality stainless steel.
- 8. A trocar and cannula set including a trocar as above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0308560A GB2400324B (en) | 2003-04-12 | 2003-04-12 | Improvements in or relating to trocars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0308560A GB2400324B (en) | 2003-04-12 | 2003-04-12 | Improvements in or relating to trocars |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0308560D0 GB0308560D0 (en) | 2003-05-21 |
| GB2400324A true GB2400324A (en) | 2004-10-13 |
| GB2400324B GB2400324B (en) | 2006-04-05 |
Family
ID=9956729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0308560A Expired - Lifetime GB2400324B (en) | 2003-04-12 | 2003-04-12 | Improvements in or relating to trocars |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2400324B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102327142A (en) * | 2011-08-26 | 2012-01-25 | 东莞微视医疗科技有限公司 | Manufacturing method of cannula puncture outfit for disposable laparoscope and puncture outfit for implementing same |
| US8974481B2 (en) | 2006-05-02 | 2015-03-10 | Gimmi Gmbh | Instrument for producing a skin opening for minimally invasive surgery |
| US9687273B2 (en) | 2013-09-11 | 2017-06-27 | Gimmi Gmbh | Endoscopic surgical instruments and related methods |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2199247A (en) * | 1986-11-29 | 1988-07-06 | Femcare Ltd | Subcutaneous implantation equipment |
| FR2718629A1 (en) * | 1994-04-14 | 1995-10-20 | Launey Pierre | Syringe to inject flavouring into raw meat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5185006A (en) * | 1990-12-17 | 1993-02-09 | Becton, Dickinson And Company | Lubricated metal articles and assembly containing same |
-
2003
- 2003-04-12 GB GB0308560A patent/GB2400324B/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2199247A (en) * | 1986-11-29 | 1988-07-06 | Femcare Ltd | Subcutaneous implantation equipment |
| FR2718629A1 (en) * | 1994-04-14 | 1995-10-20 | Launey Pierre | Syringe to inject flavouring into raw meat |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8974481B2 (en) | 2006-05-02 | 2015-03-10 | Gimmi Gmbh | Instrument for producing a skin opening for minimally invasive surgery |
| CN102327142A (en) * | 2011-08-26 | 2012-01-25 | 东莞微视医疗科技有限公司 | Manufacturing method of cannula puncture outfit for disposable laparoscope and puncture outfit for implementing same |
| US9687273B2 (en) | 2013-09-11 | 2017-06-27 | Gimmi Gmbh | Endoscopic surgical instruments and related methods |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0308560D0 (en) | 2003-05-21 |
| GB2400324B (en) | 2006-04-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20230411 |